CROSS REFERENCE TO RELATED APPLICATIONS 
     Applicant claims priority under 35 U.S.C. 119 of German Application No. 10 2007 018 314.5 filed Apr. 18, 2007. Applicant also claims priority under 35 U.S.C. 120 of International Application No. PCT/DE2008/000538 filed Mar. 27, 2008. This application is a by-pass continuation-in-part application of said International Application No. PCT/DE2008/000538 filed Mar. 27, 2008. The International Application under PCT Article 21(2) was not published in English. The disclosure of the aforesaid International Application and German application are incorporated by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a prop for a three-dimensional framework with a fastening device for fastening a railing device to the prop as well as to a connecting arrangement for a railing device, which comprises at least one prop for a three-dimensional framework and a railing device, which is fastenable to the prop with the help of a fastening device, and further relates to a method for fastening a railing device to a prop for a three-dimensional framework with the help of a fastening device. 
     2. The Prior Art 
     A number of fastening devices for fastening railing devices to props for three-dimensional frameworks, particularly to vertical scaffolding posts, have become known from practice in the past. 
     A particularly simple fastening construction has become known from, for example, CH-A-439679. This relates to a building scaffolding with vertical support frames, the vertical prop tubes of which are provided with U-shaped insertion eyes, into which insert ends, which are bent over downwardly at right angles, of handrail bars of railing frames are inserted. These railing frames are not secured against lifting up in upward direction, which from safety aspects is not acceptable. 
     Another railing fastening has become known from FR-A-25 16 141. There, scaffolding frames with vertical posts are provided, to which transverse bolts extending away therefrom are fastened. These have upwardly projecting dogs at the free ends thereof, so that these bolts form a kind of hook. The ends of a double railing or of a railing frame are hung in these hooks, for which purpose the upper two end straps of the double railing or railing frame are provided with downwardly open receiving openings forming a kind of counter-hook. The lower two end straps are provided with slots which extend in vertical direction, of which one slot is securable by a withdrawal securing means, which is pivotable about a horizontal axis, against withdrawal in the direction of the bolt of the associated hook of one of the scaffolding posts. These railings are similarly not secured against lifting off in upward direction. FR-A-25 16 141 also discloses L-shaped longitudinal bars used for connecting and fastening two adjacent scaffolding standing frames, on which L-shaped supports are supported, the supports being provided with a transverse bar on which scaffolding boards of wood can be supported in an intermediate position between the cross beams of adjacent scaffolding standing frames. These L-shaped longitudinal bars have two vertically spaced end limbs at their L-limb and a third end limb at their other end extending perpendicularly away from the L-limb. This third end limb has a downwardly open hook which can be hung in place on an upwardly open hook bolt of the post of one of the standing frames. The third end limb additionally has a hook-shaped pivot shackle which is pivotable about a transverse axis and which, when the third end limb is hung in place at the hook bolt, pivots under the hook bolt due to gravitational force and in this manner makes possible securing against lifting off in vertical direction at this end of the L-shaped longitudinal bar. Apart from the fact that faulty functioning in the case of dirtying can arise with this pivot shackle, which is not acceptable from safety aspects, this means an increased risk of injury at pivot shackles, which are fastened to the end of the L-shaped longitudinal bar, during handling of the L-shaped longitudinal bar. 
     Due to the aforesaid reasons other solutions have been developed by which it has been sought to avoid the afore-described disadvantages. These solutions can be essentially divided into two main groups. 
     A first main group relates to constructions in which the railing devices are secured in force-locking manner by clamping forces against lifting-off from the mounts of the supports. For that purpose, U-shaped wedge cases are usually fastened to the vertical scaffolding tube uprights by their limbs, into which straps, which are bent over downwardly at right angles, of railings are inserted and fastened thereat by means of a wedge. This has to be knocked in by a hammer in order to achieve compressing of a strap of a railing against the tubular upright or of two straps, which are hung in the same wedge case, of two railings against one another and against the tubular upright in order to thus fasten the railing or railings to be secure against vertical lifting-off in upward direction. In order to dismantle the scaffolding the wedges have to be knocked out by a suitable tool, so that the assembly and disassembly of scaffolding of that kind is only possible with a comparatively high degree of effort by means of a tool. Constructions of that kind have become known from, for example, DE-A-27 57 189, DE-A-38 32 480, DE-A-31 08 020, DE-A-198 27 284 and DE-U-20 2004 007 550 under the name ‘Layher-Blitz-Gerust-System’. For specific instances of use the wedge cases can also be detachably connectible with the scaffolding posts, as disclosed in, for example, WO 02/066765 A2. 
     Other clamping connections by which it is sought, by a force-locking connection, to prevent or impede lifting-off of the railing in upward direction have become known from, for example, DE-PS-100 10 229 or DE-PS-199 19 358. However, due to the comparatively limited clamping forces, lifting-off of the railing in upward direction cannot be securely prevented. 
     Further clamping connections in which, through a frictional clamping of one or two insertion straps, which are inserted into a U-shaped stirrup, of railings to the scaffolding post, a fastening of the railing to the scaffolding post also against vertical lifting-off is achievable have become known from, for example, DE-A-42 34 473 and DE-A-195 04 038. In these constructions the clamping of the railing strips, which are bent over downwardly at right angles, relative to the scaffolding post is achieved with the help of an eccentric lever pivotable about a horizontal transverse axis. In these clamping constructions comparatively large clamping forces have to be applied in order to secure the railings against lifting off in upward direction, which requires correspondingly high operating forces during locking and unlocking. Moreover, the use possibilities of these constructions are confined to horizontal scaffolding attachments in which the railings can be installed only from the same scaffolding tier, which can mean a safety risk. 
     A second main group of railing fastening constructions concerns solutions in which the railings are connected with the scaffolding posts in purely mechanically positive manner. 
     In a first subgroup, for this purpose cross bolts onto which the railings provided with matching passage holes are plugged are fastened to the vertical scaffolding props to produce transversely to the longitudinal axes thereof. The first subgroup can be subdivided into two further groups: 
     In a first group of this first subgroup of the second main group use is made of cylinder bolts which have at the free ends thereof a vertical slot in which a tilt pin strap is arranged to be pivotable about a horizontal transverse axis. For fastening of a railing to the scaffolding posts the tilt pin straps have to be transferred into an unlocking setting enabling introduction of the railing strips, which are provided with matching passage holes, onto the cylinder bolts. After the introduction and plugging on of the apertured railing strips the respective tilt pin strap has to be transferred back into a vertical locking setting, which in principle is achieved by itself with gravitational force assistance. However, if—as frequently occurs in practice—the free ends of the cylinder bolts are contaminated, for example by paint, faulty functions can arise so that the tilt pin straps concerned then have to be laboriously locked again by hand. This means an unacceptably high amount of effort or, for the case of inattention, a significant safety risk. Constructions of that kind have become known from, for example, DE-U-87 11 664, DE-A-31 39 980, DE-A-197 03 558 and DE-A-10 2004 055 394. 
     A second group of the first subgroup of the second main group concerns similar constructions which are thus based on the same fundamental principle, namely fastening to scaffolding posts transversely protruding bolts onto which railings provided with passage holes are plugged. However, in these constructions, such as have become known from, for example, DE-A-196 33 092 or EP-A-1 262 611, use is not made of pivotable tilt pin straps. In these fastening constructions the inner contour of the passage holes of the railings and the outer contour of the bolts receiving these are formed to be matched to one another in such a manner that plugging of the railings onto the bolts is possible only obliquely from below, i.e. from the scaffolding tier disposed thereunder, in that the railing is plugged from below onto the bolt at an angle of less than 90 degrees relative to the longitudinal axis of the scaffolding post. Subsequently, through pivoting of the railing upwardly into a horizontal use or installation setting a mechanically positive locking of the railing relative to the scaffolding post also in the direction of the longitudinal axis of the plug-on bolt is achieved at the same time. A horizontal mounting of railings from the same scaffolding tier is not possible with these constructions. 
     An intermediate variant of the second main group has become known from DE-A-10 2004 055 394 already mentioned in the foregoing. In this construction, which is now again provided with tilt pivot straps, the railing ends are provided with slots which extend radially outwardly from the plug-through opening for the cylinder bolts and are arranged at specific angles relative to the longitudinal axis of the railing and which enable insertion of tilt pin straps and plugging-on of the railing end also from the scaffolding tier disposed thereunder. After plugging of the railing from below onto the tilt pin straps and onto the cylinder bolts a mechanically positive locking also in the direction of the transverse bolt is again, achieved by pivoting the railing upwardly into its horizontal use or installation setting. 
     All these constructions associated with the first subgroup and the intermediate variants of the second main group have, however, the disadvantage that when the ends of two railings are plugged onto the bolts the rearward railing, thus that lying closer to the scaffolding post, cannot be demounted without the front railing, thus that lying further away from the scaffolding post, also being demounted beforehand. 
     Another construction concerning a railing fastening, which can be associated with a second subgroup of the second main group, in which the railings are similarly connected in purely mechanically positive manner with the scaffolding posts, has become known from DD 90 210 A. In that case a strap is welded to a tubular post which, with formation of a receptacle for railing strips to be inserted vertically, is profiled in L-shaped manner and bent over upwardly as well as open upwardly. In the region of the upper free end of the L-strap this is provided with a vertical slot. Projecting through this vertical slot is a nose of a drop latch which is pivotable about a horizontal pivot axis and which is rotatably mounted on a horizontal pin. The pin is welded to the L-strap with bridging-over of the vertical slot thereof. For the purpose of fastening two railing strips or in a given case also only one railing strip to the tubular post these are or this is introduced, vertically from above, vertically downwardly into the receptacle formed by the L-strap. The nose of the drop latch is thereby pivoted away into a release setting. In the course of a further introduction of the respective railing strip this is introduced vertically downwardly until the nose of the drop latch pivots, under gravitational force, back into its initial setting. Then or thereafter the respective railing strip comes to rest on the lower L-limb of the L-strap. For removal of the two railing strips or in a given case also only one of the railing strips the drop latch has to be manually pivoted upwardly about its pivot axis into a release setting making it possible to pull out the respective railing strip vertically upwardly, whereupon the respective railing strip can be pushed vertically upwardly out of the railing receptacle formed by the L-strap. 
     In this railing fastening it is necessary, due to the construction, to provide between the upper edges of the railing strips to be secured and the nose—which secures these against vertical lifting-off—of the drop latch an appropriately large gap enabling pivotation of the nose of the drop latch. As a result, the railing strips can be fastened only very loosely and with considerable vertical play, which means a safety risk. Moreover, this construction, due to the drop latch protruding laterally in the locking setting, requires a comparatively large amount of space and the risk exists that persons are caught at the drop latch. Finally, the risk exists that the upwardly open L-strap under the rough conditions in practice twists outwardly away from the tubular post so that then the railing strips are no longer secured against vertical lifting off. This means a significant safety risk. 
     SUMMARY OF THE INVENTION 
     It is an object of the invention to provide a prop for a three-dimensional framework with a fastening device or with a railing-device fastening device for fastening a railing device to the prop and a connecting arrangement for a railing device, which comprises at least one prop for a three-dimensional framework and a railing device, which with the help of a fastening device or a railing-device fastening device is fastenable to the prop, and also to provide a method of fastening a railing device to a prop, by which or with which, with maintenance of as many as possible of the advantages that have become known from the prior art, the disadvantages described in the foregoing are avoided, particularly by which or with which advantageous possibilities for securing or locking the railing device and/or for mounting and/or for demounting the railing device, as well as for a particularly stable construction, are created. It is further an object of the invention to be able to produce a prop of that kind with a fastening device or with a railing-device fastening device and a connecting arrangement of that kind simply and economically. Moreover, it is an object of the invention to provide a connecting arrangement which can be assembled and disassembled simply and quickly. A further object of the invention is to provide a prop with a fastening device and a connecting arrangement which enable advantageous possibilities for installation and removal of a railing device not only from the same scaffolding tier, but also from below as an advance railing. Finally, it is an object of the invention to provide a connecting arrangement in which demounting of a railing device is possible without requiring demounting of a neighbouring railing device. 
     This object or these objects are preferably fulfilled by the features according to the invention. 
     According to a first solution concept or according to a first invention group there can be provided a prop, particularly a vertical post, of metal for scaffolding, particularly for facade scaffolding, a stage, a staircase or like three-dimensional framework, with a fastening device for fastening at least one railing device, particularly a single or double railing, preferably a railing rod, to the prop, wherein the fastening device comprises a mount for the railing device, wherein the mount is fastened, preferably captively, in particular permanently, for example by welding, to the prop, and wherein the mount comprises a rest element, which extends in a first direction transversely, preferably perpendicularly, to the longitudinal axis of the prop away therefrom, with a rest surface, which is horizontal in use setting of the prop, for vertical support of the railing device, wherein the fastening device further comprises a locking element, which is firmly, preferably captively, connected with the prop and preferably formed with or as a locking lever, with a locking surface for mechanically positive locking in a locking setting, preferably free of clamping force, of the railing device against vertical removal thereof in upward direction when the prop is in use setting, wherein the locking element is pivotable, preferably manually, about a pivot axis from an unlocking setting into the locking setting and conversely wherein the locking surface of the locking element in the locking setting lies opposite the rest surface of the rest element and in the locking setting as well as in use setting of the prop is arranged at a vertical spacing above the rest surface of the rest element and/or that the pivot axis in use setting of the prop is arranged at a vertical spacing above the locking surface disposed in the locking setting, preferably also at a vertical spacing above the rest surface of the rest element. For preference, the mount has a passage opening, which is closed or surrounded at the whole circumference or entirely or substantially at the whole circumference, for insertion of an end of the at least one railing device, particularly the railing rod, the opening being bounded by a support element—which extends at a transverse spacing from the prop and preferably parallel to the longitudinal axis of the prop, particularly upwardly in the use setting thereof, and which is connected, preferably integrally, with the rest element—of the mount for lateral support of a rest part of the railing device. 
     Due to the fact that the mount has a passage opening, which is closed or surrounded at the whole circumference or entirely or substantially at the whole circumference, for insertion of an end of the at least one railing device, particularly the or a railing rod, which opening is bounded by a support element—which extends at a transverse spacing from prop and is preferably parallel to the longitudinal axis of the prop, particularly upwardly in the use setting thereof, and which is connected, preferably integrally, with the rest element—of the mount for lateral support of a rest part of the railing device, there is made possible not only simple and economic production, but also a particularly stable construction of the mount, whereby the locking element is fastenable and storable particularly stably and securely. By a passage opening which is “closed or surrounded at the whole circumference or entirely or substantially at the whole circumference” there can be understood in the sense of this protective right a passage opening bounded by wall parts which form one or more bodies surrounding the passage body at the whole circumference or entirely or substantially at the whole circumference. 
     According to a second solution concept or according to a second invention group or according to an advantageous embodiment there can be provide a prop, particularly a vertical post, of metal for scaffolding, a stage, a staircase or like three-dimensional framework, with a fastening device for fastening at least one railing device, particularly a single or double railing, preferably a railing rod, to the prop, wherein the fastening device comprises a mount for the railing device, wherein the mount is permanently fastened, preferably by welding, to the prop, and wherein the mount comprises a rest element, which extends in a first direction transversely, preferably perpendicularly, to the longitudinal axis of the prop away therefrom, with a rest surface, which is horizontal in use setting of the prop, for vertical support of the railing device, wherein the fastening device further comprises a locking element, which is firmly, preferably captively, connected with the prop and preferably formed with or as a locking lever, with a locking surface for mechanically positive locking in a locking setting, preferably free of clamping force, of the railing device against vertical removal thereof in upward direction when the prop is in use setting, wherein the locking element is pivotable, preferably manually, about a pivot axis from an unlocking setting into the locking setting and conversely, wherein the locking surface of the locking element in the locking setting lies opposite the rest surface of the rest element and in the locking setting as well as in use setting of the prop is arranged at a vertical spacing above the rest surface of the rest element and wherein on pivotation of the locking element about the pivot axis from an unlocking or open setting into the locking or closed setting the locking surface of the locking element is pivoted downwardly when the prop is in use setting. 
     Through the foregoing measures a particularly simple or easy and secure locking as well as a particularly simple or easy unlocking or release can be carried out by a user. Moreover, through this measure it is possible to achieve a secure locking or a high degree of security against unintended unlocking. 
     In both solution concepts or invention groups the locking element can be fastened preferably with the help of a fastening means containing the pivot axis, particularly a rivet or a bolt or a pin, particularly a dowel pin—which is preferably slotted—or a grooved pin, to the prop or to the mount, preferably to the support element, or not to the mount or not to a part of the mount containing the receiving element of the mount or not to a or the support element of the mount for lateral support of a rest part of the railing device, but to the prop or to another part of the prop, preferably to a separate fastening body fastened to the prop, preferably permanently, particularly by welding, and preferably at a spacing from the mount. 
     According to a further solution concept or according to a third invention group or according to an alternative or additional embodiment there can be provided a prop, particularly a vertical post, of metal for scaffolding, a stage, a staircase or like three-dimensional framework, with a fastening device for fastening at least one railing device, particularly a single or double railing, preferably a railing rod, to the prop, wherein the fastening device comprises a mount for the railing device, wherein the mount is permanently fastened, preferably by welding, to the prop, and wherein the mount comprises a rest element, which extends in a first direction transversely, preferably perpendicularly, to the longitudinal axis of the prop away therefrom, with a rest surface, which is horizontal in use setting of the prop, for vertical support of the railing device, wherein the fastening device further comprises a locking element, which is firmly, preferably captively, connected with the prop and preferably formed with or as a locking lever, with a locking surface for—in a locking setting—mechanically positive locking, preferably free of clamping force, of the railing device against vertical removal thereof in upward direction when the prop is in use setting, wherein the locking element is pivotable, preferably manually, about a pivot axis from an unlocking setting into a locking setting and conversely, wherein the locking surface of the locking element in the locking setting is opposite the rest surface of the rest element and in the locking setting as well as in use setting of the prop is arranged at a vertical spacing above the rest surface of the rest element and wherein the locking element is fastened, preferably with the help of a fastening means containing the pivot axis, particularly a rivet or a bolt or a pin, particularly a—preferably slotted—dowel pin or a grooved pin, not to the mount or not to a part of the mount containing the receiving element of the mount or not to a or the support element of the mount for lateral support of a rest part of the railing device, but to the prop or to another part of the prop, preferably to a separate fastening body fastened, preferably permanently, particularly by welding, and preferably at a spacing from the mount, to the prop. 
     Through these measures it is possible to achieve a particularly stable construction or fastening possibility for the locking element. A construction of that kind can equally be produced particularly simply and economically. Moreover, advantageous suspension possibilities for the railing device can be achieved by the aforesaid measures. 
     In the second and/or third solution alternative or in the second and/or third invention group it can be provided that the mount has a passage opening, which is closed or surrounded at the whole circumference or entirely or substantially at the whole circumference, for insertion of an end of the at least one railing device, particularly the railing rod, which is bounded by a support element—which extends at a transverse spacing from the prop and preferably parallel to the longitudinal axis of the prop, particularly upwardly in the use setting thereof, and which is connected, preferably integrally, with the rest element—of the mount for lateral support of the rest part of the railing device. This makes possible not only a simple and economic product ion, but also a particularly stable construction of the mount. 
     In all three solution alternatives or invention groups, optionally also in combinations of two or all three of these solution alternatives or invention groups, provision can be made for the pivot axis to extend transversely, preferably perpendicularly, to the longitudinal axis of the prop or transversely, preferably perpendicularly, to the first direction. 
     However, it is of particular advantage if the pivot axis extends transversely, preferably perpendicularly, to the longitudinal axis of the prop and also transversely, preferably perpendicularly, to the first direction. 
     In addition, it can be provided that the mount is formed with a receiving profile, which is upwardly open in use setting of the prop, for reception of a rest part of the railing device, which is constructed with a support element—which extends at a transverse spacing from the prop and preferably parallel to the longitudinal axis of the prop, particularly upwardly in the use setting thereof, and is connected, preferably integrally, with the rest element and fastened thereto—of the mount for lateral support of the rest part of the railing device, wherein a passage opening for reception of the rest part of the railing device is formed between the support element and the prop. 
     In that case it is of advantage if the receiving profile is formed as a half U-profile, half C-profile or half V-profile or as a J-profile or as a U-profile, C-profile or V-profile. 
     Moreover, it is a advantage if the opening edge of the passage opening s pans a vertical opening plane in use setting of the prop. 
     It is of particular advantage if the passage opening in use setting of the prop is formed as a vertical receiving slot extending in the direction of, preferably parallel to, the longitudinal axis of the prop. 
     According to a particularly simply and economically producible variant of embodiment it can be provided that the mount is formed with or as a stirrup, preferably of a flat material, which has or bounds a passage opening for reception of a rest part of the railing device. 
     In that case it can be provided that the stirrup extends in the direction of, preferably parallel to, the longitudinal axis of the prop. 
     With preference it can be provided that the mount is a punched, cast or forged part of metal. 
     Moreover, provision can be made for the locking element, which is preferably formed with a locking lever or formed as a locking lever, to be fastened to the prop or to the mount, preferably to the support element. 
     Furthermore, it can be provided that the locking element or the locking lever is fastened to the prop or to the mount, preferably to the support element, with the help of a fastening means containing the pivot axis, preferably a rivet. 
     For preference it can be provided that the locking element is formed as or with a locking lever which is manually actuable or to be manually actuated and which preferably consists of plastics material or of metal. 
     Provision can be made for the locking lever to have an actuating part which, in the locking setting, protrudes beyond the edge of the mount which is lower when the prop is in the use setting. This makes possible a particularly simple opening or unlocking of the locking lever by hand, particularly by a finger of the hand of a user. 
     Moreover, it can be provided that the locking lever has an actuating part which extends transversely, preferably perpendicularly, away from the pivot axis and which is preferably elongate. This can have a length which is greater, particularly very much greater, than the width of the actuating part or of the locking lever overall. Particularly as a result and, in a given case, in conjunction with a conspicuous coloration of the locking element it is clearly apparent whether the locking lever is disposed in its locking setting and thus whether or not the railing device suspended there is actually secured. 
     In that case it can be provided that the locking lever has a longitudinal slot, which extends preferably transversely, particularly perpendicularly, to the pivot axis and in which in the locking setting a part of the vertical support element of the mount is received. In this manner the projection beyond the prop and also the risk of injury in the locking setting are minimised. 
     Moreover, it can be provided that the locking lever and the mount are formed to be so matched to one another that the locking lever in the locking setting is releasably detented at the mount or at a counter-body fastened thereto so that the locking lever is pivotable from the locking setting to an open setting or to the unlocking setting only by application of an increased opening force. As a result, the point from which the locking lever is disposed in a secure locking setting is made particularly clear to the user, this being made noticeable on the one hand in the case of actuation by hand through a diminishing of the closing force and on the other hand by a clearly audible noise on folding closed or locking of the locking lever. 
     In addition, provision can be made for the locking element to comprise a pressing body which on pivotation of the locking element from the unlocking setting to the locking setting comes into engagement or stands in engagement with a counter-body, which is firmly fastened, preferably permanently, to the prop or to the mount, preferably to the support element, and/or which is formed by a part of the prop, wherein the pressing body and the counter-body are formed to be so matched to one another that on pivotation of the locking element from the unlocking setting to the locking setting a pressing force opposing unintended unlocking of the locking element is formed between the pressing body and the counter-body and/or that in the locking setting a pressing force opposing unintended unlocking of the locking element is formed between the pressing body and the counter-body. 
     In that case it can be provided that the pressing body and/or the counter-body is or are constructed as an eccentric body. 
     For preference, provision can be made for the pressing body to be formed as an eccentric body arranged eccentrically to the pivot axis. 
     In a preferred embodiment it can be provided that the counter-body is formed as a, preferably cylindrical, pin or bolt which is fastened firmly, preferably non-detachably, to the prop or to the mount, preferably to the support element. 
     In that case it can be provided that the longitudinal axis of the pin or bolt extends transversely, preferably perpendicularly, to the longitudinal axis of the prop or extends transversely, preferably perpendicularly, to the first direction. However, in a particularly advantageous embodiment provision can be made for the longitudinal axis of the pin or bolt to extend transversely, preferably perpendicularly, to the longitudinal axis of the prop and transversely, preferably perpendicularly, to the first direction. 
     Moreover, it can with advantage be provided that the locking lever has a detent recess in which the pin or bolt, which is fastened to the prop or to the mount, preferably to the support element, engages in detenting manner in the locking setting. 
     Furthermore, it can be provided that the locking lever on pivotation about its pivot axis is pivotable, preferably upwardly, from the closing or locking setting into an or the open or unlocking setting only through a maximum opening angle which is limited by an abutment and which is smaller than 60 degrees, preferably smaller than or equal to approximately 45 degrees. As a result, the risk of a person being caught at the locking lever protruding in its open or unlocking setting can be reduced. 
     In that case it can be provided that the abutment is formed with a lug which is provided in the region of the, preferably upper, end of the mount and is connected, preferably integrally, with the mount. This construction can be realised or produced particularly simply and economically. 
     Moreover, provision can be made for the locking lever in the maximum open or unlocking setting, which is preferably limited by an or the abutment, to not project into a or the passage opening, which serves for insertion of an end of the at least one railing device, of the mount. In other words, it can be provided that—in the maximum open or unlocking setting, which is preferably limited by an or the abutment, of the locking lever—a or the passage opening, which serves for insertion of an end of the at least one railing device, of the mount does not cover or conceal the passage opening or the opening cross-sectional area thereof of the locking lever or of parts of the same. As a result, during insertion or hanging in place and placing as well as during removal and withdrawal or unhanging of the railing device collisions with the locking lever do not occur, which simplifies mounting and demounting of the railing device. 
     Moreover, it can be provided that the locking lever in the maximum open or unlocking setting, which is preferably limited by an or the abutment, bears by a or the pressing body against a or the counter-body, which is fastened to the mount and preferably formed as a bolt or pin, so that a downward pivotation, which is induced by gravitational force, of the locking lever about its pivot axis is prevented. It is thereby in turn ensured that the passage opening of the mount remains free of the locking lever, which is disposed in the unlocking or open setting, or of parts thereof. 
     The invention also relates also to a connecting arrangement for a railing device, which comprises at least one prop for scaffolding, particularly facade scaffolding, a stage, a staircase or like three-dimensional framework, according to at least one of claims  1  to  31 , and a railing device, which is formed particularly as a single or double railing and is preferably formed with or as a railing rod and which is fastenable to the prop with the help of the fastening device. 
     It can be characteristic for a connecting arrangement of that kind that the locking surface of the locking element in the locking setting is opposite the rest surface of the rest element and in the locking setting as well as in use setting of the prop is arranged above the rest surface of the rest element at a vertical spacing which is greater than the height of a rest part, which rests on the rest surface of the rest element of the mount, of the railing element and/or that the pivot axis in use setting of the prop is arranged at a vertical spacing above the locking surface—which is disposed in the locking setting—preferably also at a vertical spacing above the rest surface of the rest element, which is greater than the height of a or the rest part, which rests on the rest surface of the rest element of the mount, of the railing device. 
     The invention further relates to a connecting arrangement for a railing device, which comprises at least one prop, particularly a vertical post, of metal for scaffolding, particularly facade scaffolding, a stage, a staircase or like three-dimensional framework, and at least one railing device, which is formed as, in particular, a single or double railing and preferably formed with or as a railing rod and which is fastenable with the help of a fastening device to the prop, wherein the prop comprises a mount for the railing device, wherein the mount is fastened, preferably captively, in particular permanently, for example by welding, to the prop, and wherein the mount comprises a rest element, which extends in a first direction transversely, preferably perpendicularly, to the longitudinal axis of the prop away therefrom, with a rest surface, which is horizontal in use setting of the prop, for vertical support of the railing device, on which a rest part, which is preferably arranged in the region of an end of the railing device or the railing rod, of the railing device can be supported and wherein the fastening device further comprises a locking element, which is firmly, preferably captively, connected with the prop, with a locking surface for mechanically positive locking, preferably free of clamping force, of the railing device against vertical removal thereof in upward direction when the prop is in use setting, wherein the locking element is pivotable, preferably manually, about a pivot axis from an unlocking setting, in which the railing device can rest on the rest surface of the rest element of the mount or is removable from the mount, into a locking setting and conversely, in which the railing device is locked by means of the locking element against removal from the mount at least in one direction and in which the railing device is secured against removal in any directions from the mount, wherein the locking element is transferrable from a locking setting, in which the railing device is mechanically positively locked, preferably free of clamping force, by means of the locking element against withdrawal from the mount upwardly in the direction of, preferably parallel to, the longitudinal axis of the prop when the prop is in use setting, to an unlocking setting, and conversely, in which the railing device is removable from the mount, without previous lifting off in the first direction from the rest surface of the rest element, at least horizontally in a second direction transversely, preferably perpendicularly, to the longitudinal axis of the prop when the prop is in use setting and also transversely, preferably perpendicularly, to the first direction, preferably after previous lifting off from the rest surface of the rest element in upward direction. 
     In that case it can be provided that the fastening device and the railing device are formed to be so matched to one another that the railing device, although the locking device is disposed in the locking setting, is placeable from below, particularly obliquely from below, on the rest surface of the rest element of the mount, or can be suspended there, when the prop is in use setting and, starting from this setting, is pivotably upwardly and transferrable to an installation setting in which the railing device is secured against removal from the mount in any directions. 
     Moreover, it can be provided that the mount is formed with a receiving profile, which is upwardly open in use setting of the prop, for reception of a rest part of the railing device, in which the rest part of the railing device is at least partly received while being supported on the rest surface of the rest element, wherein the receiving profile is formed with a support element, which extends at a transverse spacing from the prop and preferably parallel to the longitudinal axis of the prop, particularly upwardly in the use setting thereof, and which is connected, preferably integrally, with the rest element and fastened thereto, for lateral support of the rest part of the railing device, wherein a passage opening for reception of the rest part of the railing device, which passes horizontally through the passage opening in use setting of the prop, is formed between the support element and the prop. 
     Furthermore, provision can be made for the mount to have a passage opening, which is closed entirely or substantially at the full circumference, for insertion of an end of the at least one railing device, particularly of the railing rod, through which opening the end of the railing device or of the railing rod is inserted. 
     Finally, in a preferred embodiment it can be provided that the passage opening in use setting of the prop is formed as a vertical receiving slot, which extends in the direction of, preferably parallel to, the longitudinal axis of the prop and into or through which the rest part of the railing device, preferably the end of the railing device or of the railing rod, is inserted. 
     In that case it can be provided that the receiving slot has a height which is greater than the width or the height of at least one end of the ends of the railing device or of the railing rod. 
     Moreover, it can provided that the passage opening has a width which is greater than the thickness or width of the rest part of the railing device. In a preferred embodiment it can be provided that the passage opening has a width which greater than twice the thickness or width of the rest part of the railing device. In this manner at least two railing devices can, by the rest parts thereof, be placed on one and the same mount or hung in one and the same mount. 
     Furthermore, provision can be made for the ends, which are intended for support on the rest element of the mount of the railing device, which is preferably formed as or with a railing rod, to be formed to be flattened. 
     Moreover, it can be provided that the railing device has in the region of at least one end of its, preferably flattened, ends an outwardly open first recess, which extends in the direction of, preferably parallel to, the longitudinal axis of the end or of the railing rod and is bounded by the rest part for support on the rest surface of the rest element of the mount and which is bounded by a first wall part, particularly a lug, extending transversely, preferably perpendicularly, to the longitudinal axis of the end or of the railing rod. 
     In that case provision can be made for at least one wall part of the wall parts, which laterally bound the first recess in the direction of the longitudinal axis of the end or of the railing rod, to be formed on the side of the recess to be radiussed, particularly concavely radiussed, and/or chamfered, for example with an entry chamfer. This enables a better or easier lowering of the railing device. 
     Moreover, it can be provided that a second recess adjoins the first wall part or the lug in the region of the first recess and is bounded by a rest surface, which extends in the direction of, preferably parallel to, the longitudinal axis of the end or of the railing rod and is deepened relative to the first recess or the rest surface thereof, of the rest part and by two support surfaces, which are preferably parallel and have a support surface spacing from one another and which extend transversely, preferably perpendicularly to the longitudinal axis of the end of the railing device or of the railing rod, wherein the support surface spacing is greater than the width of the rest element of the mount in the region of the rest surface thereof. As a result, a defined detenting and rest position of the railing device on the rest element of the mount is defined and advantageous possibilities for a mechanically positive connection of these elements result. 
     In that case it can be provided that the support surface spacing is approximately 1.5 to 3 times the width of the rest element in the region of the rest surface thereof. The play of the railing device relative to the rest element of the mount or the rest elements of the mounts can thereby be minimised with consideration of production and assembly tolerances. 
     In addition, it can be provided that the length of the first recess extending in the direction of the longitudinal axis of the end or of the railing rod is greater than the spacing, measured in the same direction, between the support surface—which is associated with the free end of the railing device or of the railing rod—of the second recess and this free end of the railing device or of the railing rod. 
     Moreover, it can be provided that the railing rod inclusive of its ends is formed as a straight rod, thus without the ends being bent over and/or angled. This enables a particularly simple and economic production as well as a particularly simple and space-saving storage of a railing rod of that kind. 
     It is of particular advantage if the spacing between the rest surface of the rest element and the locking surface of the locking element in the locking setting is greater than the spacing, preferably the greatest spacing, between the surface, which faces away from the free end of the railing device or of the railing rod and which bounds the first recess, of the first wall part or the lug and this free end of the railing device or of the railing rod, in particular is greater than the greatest spacing between the support surface, which faces away from the free end of the railing device or of the railing rod and which bounds the second recess, and this free end of the railing device or of the railing rod. As a result, in this way the railing device—even when the locking element is disposed in its locking setting or despite the locking element being disposed in its locking setting—can be placed or hung in place from below, particularly from a scaffolding tier disposed thereunder, at or in the rest element and can be subsequently pivoted upwardly into its horizontal installation or use setting without the locking element having to be transferred from its locking setting to an open or unlocking setting, wherein then in this installation or use setting a fastening of the railing device to the prop with mechanically positive securing against vertical lifting off in upward direction is already guaranteed in any directions without further measures. 
     The invention also relates to a vertical frame element with at least one prop and/or with at least one connecting arrangement, which is additionally formed in accordance with the subject, in particular according to at least one of the claims, of European Patent Application No 06021346.9 or of German Utility Model Application No 20 2006 015 586.4. 
     The invention further relates to a scaffolding frame, particularly scaffolding standing frame, with at least one prop and with at least one transverse arm, which is fastened, preferably captively, in particular permanently, for example by welding, at least to the at least one prop. 
     The invention additionally relates to a scaffolding frame, particularly scaffolding standing frame, with at least one connecting arrangement, wherein at least one transverse element is fastened, preferably captively, in particular permanently, for example by welding, to the at least one prop. 
     Finally, the invention also relates to scaffolding, particularly building scaffolding, preferably facade scaffolding, with at least four vertical props, at which preferably at least one covering unit, particularly a scaffolding floor, horizontal rod elements and/or at least one diagonal element for stiffening the scaffolding, are mounted, and with at least one prop and/or with at least one connecting arrangement and/or with at least one vertical frame element and/or with at least one scaffolding frame. 
     The invention also relates to a method of fastening at least one railing device with the help of a fastening device to a prop for scaffolding, particularly facade scaffolding, a stage, a staircase or like three-dimensional framework, wherein the fastening device comprises a mount for the railing device and wherein the mount is fastened, preferably captively, in particular permanently, for example by welding, to the prop, in particular to a vertical post, of metal, and wherein the mount comprises a rest element, which extends in a first direction transversely, preferably perpendicularly, to the longitudinal axis of the prop away therefrom, with a rest surface, which is horizontal in use setting of the prop, for vertical support of the railing device, which is formed in particular as a single or double railing and preferably with or as a railing rod and which preferably forms a part of a connecting arrangement, wherein a rest part, which is preferably arranged in the region of an end of the railing device or of the railing rod, of the railing device can be supported on the rest surface of the rest element, and wherein the fastening device further comprises a locking element, which is firmly, preferably captively, connected with the prop and preferably formed with or as a locking lever, with a locking surface for mechanically positive locking, preferably free of clamping force, of the railing device against vertical removal thereof in upward direction when the prop is in use setting, and wherein the locking element is pivotable, preferably manually, in particular in downward direction in use setting of the prop, about a pivot axis from an unlocking setting, in which the railing device can be placed on the rest surface of the rest element of the mount or removed from the mount, into a locking setting, and conversely, in which the railing device is locked by means of the locking element against removal from the mount at least in one direction and in which the railing device is secured against removal in any directions from the mount, wherein the railing device is placed or plugged—before the locking element has be en transferred into its locking setting, or in unlocking setting—horizontally in a second direction transversely, preferably perpendicularly, to the longitudinal axis of the prop and also transversely, preferably perpendicularly, to the first direction on or onto the rest surface of the rest element of the mount and subsequently the locking element is transferred to its locking setting in which the railing device is mechanically positively locked, preferably free of clamping force, by means of the locking element against removal from the mount upwardly in the direction of, preferably parallel to, the longitudinal axis of the prop when the prop is in use setting. 
     In an advantageous embodiment of the afore-described method it can be provided that the railing device or the railing rod is initially placed in the region of a rest surface of the first recess of a first end of the ends thereof on the rest surface of the rest element of the mount of a first prop, preferably horizontally in the use setting thereof, wherein the locking element of the fastening device of the first prop is disposed in its unlocking setting and that subsequently the railing device or the railing rod is displaced in the direction of the mount of an adjacent second prop, until the respective rest surface of the respective second recess of the two ends of this railing device or of this railing rod comes to lie on the respectively associated rest surface of the respective rest element of the respective mount with format ion of a mechanically positive connection between the railing device and the two props, and that subsequently the locking elements of the fastening devices of the two props are pivoted into the locking setting thereof. 
     The invention further relates to a method of fastening at least one railing device with the help of a fastening device to a prop for scaffolding, particularly facade scaffolding, a stage, a staircase or like three-dimensional framework, wherein the fastening device comprises a mount for the railing device and wherein the mount is fastened, preferably captively, in particular permanently, for example by welding, to the prop, in particular to a vertical post, of metal, and wherein the mount comprises a rest element, which extends in a first direction transversely, preferably perpendicularly, to the longitudinal axis of the prop away therefrom, with a rest surface, which is horizontal in use setting of the prop, for vertical support of the railing device, which is formed in particular as a single or double railing and preferably with or as a railing rod and which preferably forms a part of a connecting arrangement, wherein a rest part, which is preferably arranged in the region of an end of the railing device or of the railing rod, of the railing device can be supported on the rest surface of the rest element, and wherein the fastening device further comprises a locking element, which is firmly, preferably captively, connected with the prop and preferably formed with or as a locking lever, with a locking surface for mechanically positive locking, preferably free of clamping force, of the railing device against vertical removal thereof in upward direction when the prop is in use setting, and wherein the locking element is pivotable, preferably manually, in particular in downward direction in use setting of the prop, about a pivot axis from an unlocking setting, in which the railing device can be placed on the rest surface of the rest element of the mount or removed from the mount, into a locking setting, and conversely, in which the railing device is locked by means of the locking element against removal from the mount at least in one direction and in which the railing device is secured against removal in any directions from the mount, wherein the railing device is—when the locking element is disposed in its locking setting and when the prop is in use setting—placed or hung in place on the rest surface of the rest element of the mount from below, particularly obliquely from below, in a direction transverse, preferably perpendicular, to the first direction, preferably approximately in a mounting plane containing a parallel to the longitudinal axis of the prop and a notional normal to the first direction, and is subsequently pivoted upwardly and transferred to a horizontal installation setting in which the railing device is mechanically positively locked, preferably free of clamping force, by means of the locking element against removal from the mount, upwardly in the direction of, preferably parallel to, the longitudinal axis of the prop when the prop is in use setting and in which the railing device is secured against removal in any directions from the mount. 
     According to a particularly advantageous variant of embodiment of the afore-described method or according to a further independent aspect of the invention there can be provided a method of fastening at least one railing device with the help of a fastening device to a prop for scaffolding, particularly facade scaffolding, a stage, a staircase or like three-dimensional framework, wherein the fastening device comprises a mount for the railing device and wherein the mount is fastened, preferably captively, in particular, permanently, for example by welding, to the prop, in particular to a vertical post, of metal, and wherein the mount comprises a rest element, which extends in a first direction transversely, preferably perpendicularly, to the longitudinal axis of the prop away therefrom, with a rest surface, which is horizontal in use setting of the prop, for vertical support of the railing device, which is formed in particular as a single or double railing and preferably with or as a railing rod and which preferably forms a part of a connecting arrangement, wherein a rest part, which is preferably arranged in the region of an end of the railing device or of the railing rod, of the railing device can be supported on the rest surface of the rest element, and wherein the fastening device further comprises a locking element, which is firmly, preferably captively, connected with the prop and preferably formed with or as a locking lever, with a locking surface for mechanically positive locking, preferably free of clamping force, of the railing device against vertical removal thereof in upward direction when the prop is in use setting, and wherein the locking element is pivotable, preferably manually, in particular in downward direction in use setting of the prop, about a pivot axis from an unlocking setting, in which the railing device can be placed on the rest surface of the rest element of the mount or removed from the mount, into a locking setting, and conversely, in which the railing device is locked by means of the locking element against removal from the mount at least in one direction and in which the railing device is secured against removal in any directions from the mount, wherein the railing device, which rests on the rest surface of the rest element of the mount in use setting of the prop, is removed from the mount after pivotation of the locking element into an or the unlocking setting, without previous removal of the railing device in the first direction from the rest element, in a second direction transversely, preferably perpendicularly, to the longitudinal axis of the prop and also transversely, preferably perpendicularly, to the first direction, preferably after previous lifting-off upwardly from the rest surface of the rest element. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Further advantages, features and aspects of the invention can be inferred from the following description part, in which a preferred exemplifying embodiment of the invention is described on the basis of the figures, in which: 
         FIG. 1  shows a three-dimensional view of a facade scaffolding which extends over a four storeys or scaffolding tiers and which consists of a first scaffolding bay with props according to the invention and connecting arrangements according to the invention and of a second scaffolding bay, which is attached thereto, with scaffolding components of modular scaffolding; 
         FIG. 2  shows a first exemplifying embodiment of a standing frame according to the invention, which is formed by two posts and a transverse arm which is permanently connected with the posts and formed by a round tube, wherein the post shown here on the left is constructed as a prop according to the invention; 
         FIG. 3  shows a second exemplifying embodiment of a standing frame according to the invention, which differs from the standing frame shown in  FIG. 2  only by the form of the transverse arm and the detail connection thereof to the two posts, wherein the transverse arm is here formed with an upwardly open U-shaped profiled tube; 
         FIG. 4  shows an enlarged three-dimensional view of a prop according to the invention, which is formed with a fastening device according to the invention with a pivotable locking element according to a first exemplifying embodiment, which here is disposed in an open or unlocking setting; 
         FIG. 5  shows a view, which corresponds with  FIG. 4 , of a prop according to the invention with the fastening device, in the mount of which an end of a first railing rod according to the invention in accordance with a first exemplifying embodiment is hung, whilst a second railing rod according to the invention, here shown on the left, is not yet hung in the same mount, wherein the locking lever is here again disposed in an open or unlocking setting; 
         FIG. 6  shows a view, which corresponds with  FIG. 5 , of a prop according to the invention with a fastening device according to the invention, in the mount of which now not only the end of a first railing rod according to the invention, but also the end of a second railing rod according to the invention—which extends in an opposite direction—is hung, wherein the locking lever is now disposed in a locking setting in which the two railing rods are mechanically positively secured, free of clamping force, against removal in any directions from the mount and consequently from the prop; 
         FIGS. 7   a  to  7   d  show different three-dimensional views of the locking lever according to the invention in accordance with a first exemplifying embodiment; 
         FIG. 7   a  shows a section along the centre longitudinal axis of the locking lever; 
         FIG. 7   b  shows a first view of the locking lever obliquely from below; 
         FIG. 7   c  shows a second view of the locking lever obliquely from below from a viewing direction different from  FIG. 7   b;    
         FIG. 7   d  shows a plan view of the locking lever obliquely from above; 
         FIG. 8   a  shows an underneath view of the locking lever according to the first exemplifying embodiment; 
         FIG. 8   b  shows a side view from the left of the locking lever; 
         FIG. 8   c  shows a longitudinal section of the locking lever along the section line A-A in  FIG. 8   d;    
         FIG. 8   d  shows a top view or plan view of the locking lever; 
         FIG. 8   e  shows a view of the locking lever according to  FIG. 8   d  from behind; 
         FIG. 8   f  shows a substantially enlarged view of a detail, which is bounded by a circle, of the longitudinal section of the locking lever according to  FIG. 8   c ; 
         FIG. 9  shows a side view of end sections of one of the railing rods according to the invention, which are shown in  FIGS. 5 and 6 , in accordance with a first exemplifying embodiment; 
         FIG. 10  shows an enlarged side view of a mount according to the invention in accordance with a first exemplifying embodiment; 
         FIG. 11  shows an enlarged three-dimensional view of a prop according to the invention, which is formed with a fastening device according to the invention with a pivotable locking lever in accordance with a second exemplifying embodiment, which lever is here disposed in an open or unlocking setting; 
         FIGS. 12   a  to  12   d  show different three-dimensional views of the locking lever according to the invention in accordance with a second exemplifying embodiment; 
         FIG. 12   a  shows a section along the centre longitudinal axis of the locking lever; 
         FIG. 12   b  shows a first view of the locking lever obliquely from below; 
         FIG. 12   c  shows a second view of the locking lever obliquely from below from a viewing direction different from  FIG. 7   b;    
         FIG. 12   d  shows a plan view of the locking lever obliquely from above; 
         FIG. 13   a  shows an underneath view of the locking lever in accordance with the second variant of embodiment; 
         FIG. 13   b  shows a side view from the left of the locking lever; 
         FIG. 13   c  shows a longitudinal section of the locking lever along the section line 
         FIG. 13   d  shows a top view or plan view of the locking lever; 
         FIG. 13   e  shows a view of the locking lever according to  FIG. 13   d  from behind; 
         FIG. 13   f  shows a strongly enlarged view of a detail, which is bounded by a circle, of the longitudinal section of the locking lever according to  FIG. 13   c;    
         FIG. 14  shows a side view of end sections of a railing rod in accordance with a second exemplifying embodiment; 
         FIG. 15  shows an enlarged side view of a mount according to the invention in accordance with a second exemplifying embodiment; 
         FIG. 16  shows an enlarged part section of a detail of a prop according to the invention parallel to the longitudinal axis thereof, which is formed with the fastening device, which is shown in  FIG. 11 , with a pivotable locking lever in accordance with the second exemplifying embodiment, which lever is here disposed in an open or unlocking setting in which the opening or slot for reception of railing rods is not covered by parts of the locking lever; 
         FIG. 17  shows a enlarged section of a detail of a prop according to the invention in accordance with  FIG. 16 , wherein now also the mount is shown in section, for illustration of a pivotation of the locking lever through an opening angle of not more than, here, approximately 45 degrees from upwardly bounding elements ; 
         FIG. 18  shows a part section corresponding with  FIG. 16 , wherein the locking lever is now disposed in its closed or locking setting; and 
         FIG. 19  shows a view, which corresponds with  FIGS. 4 and 11 , of a prop according to the invention, which is formed with a fastening device—which has a pivotable locking lever in accordance with the second exemplifying embodiment—in accordance with a third exemplifying embodiment with a mount in accordance with a third exemplifying embodiment. 
         FIGS. 20 to 22  three-dimensional views of scaffolding components of a scaffolding, to illustrate an assembly sequence in which, according to a first method variant, a method according to the invention, for installation or fastening of a railing device according to the invention, from a same scaffolding tier or story, is illustrated; 
         FIG. 20  two props according to the invention, set up at a horizontal distance from one another, whose locking elements are in an unlocking setting or open setting, in each instance, whereby a railing device according to the invention is set onto the mount of the prop shown on the left, in a horizontal direction, in an intermediate setting; 
         FIG. 21  a view of a connection arrangement corresponding to  FIG. 20 , whereby the railing device is shown in an installation setting, after horizontal displacement of the device from the intermediate setting shown in  FIG. 20  to the right, and whereby the locking elements are still in their unlocking settings or open settings; 
         FIG. 22  a view of a connection arrangement corresponding to  FIG. 21 , whereby now, the locking elements of the props are pivoted from their unlocking settings or open settings shown in  FIG. 21  into their locking setting, in each instance; 
         FIG. 23  a side view of a prop according to the invention, whose fastening device is shown in longitudinal section and partly with broken lines, whose locking element is in a locking setting, and whereby a railing device according to the invention is laid onto or suspended into the rest element of the mount of the fastening device, at a slant from below and at an angle to the longitudinal axis of the prop; 
         FIG. 24  a view corresponding to  FIG. 23 , whereby the railing device is now pivoted upward, proceeding from the diagonal setting shown in  FIG. 23 , counterclockwise, into a second diagonal setting; 
         FIG. 25  a view corresponding to  FIG. 24 , whereby the railing device is now pivoted upward further, proceeding from the diagonal setting shown in  FIG. 24 , into a third diagonal setting, in which setting a vertical play or a vertical distance between the upper end of the railing element and the locking surfaces of the locking element that is in its locking position is minimal but still present; 
         FIG. 26  a view corresponding to  FIG. 25 , whereby the railing device is now pivoted upward further, proceeding from the diagonal setting shown in  FIG. 25 , counterclockwise, into a horizontal installation setting, in which the railing element and the prop are disposed at an angle of about 90 degrees relative to one another; 
         FIGS. 27 to 30  three-dimensional views of scaffolding components, to illustrate an assembly sequence during set-up of a scaffolding, in which, according to a second method variant, a method according to the invention, for installation or fastening of a railing device according to the invention, corresponding to  FIGS. 23 to 26 , from a scaffolding tier or story that lies below it, is illustrated; 
         FIG. 31  an H-shaped standing frame according to another exemplary embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     The scaffolding  20  shown in  FIG. 1  comprises two vertical scaffolding bays  23 . 1  and  23 . 3  which are attached to one another and which each comprise four scaffolding tiers or storeys  22 . 1  to  22 . 4 . The first scaffolding bay illustrated on the left in  FIG. 1  is constructed from scaffolding standing frames  21  according to the invention. Each scaffolding standing frame  21  consists of two props  32 . 1  and  32 . 2  which are constructed as vertical posts and which are permanently connected, here by welding, by a transverse arm  35  to be stiff in bending and torsion. The transverse arm  35  here extends perpendicularly to the longitudinal axes  33  of the two props  32 . 1  and  32 . 2  in the region of the respective upper ends  36 . 1  and  36 . 2  thereof, so that a U-shaped or H-shaped scaffolding standing frame  21 ;  21 . 1 ,  21 . 2 , which is downwardly open in the use setting  34 , is formed. 
     In the exemplifying embodiments shown in, in particular,  FIGS. 1 to 3  the scaffolding standing frames  21 ;  21 . 1 ,  21 . 2  are each designed with a prop  32 . 1  according to the invention, which is formed with a fastening device  38  according to the invention for fastening at least one railing device  28  according to the invention, here, in particular, in the form of railing rods  28 . 1 ,  28 . 2 . In order to stiffen the scaffolding  20 , at least two of the posts  32 . 1 ,  32 . 1  of two adjacent scaffolding frames  21 , which are associated with a common storey  22 . 1  to  22 . 3 , are stiffened by a preferably rod-shaped diagonal element  26 . Each prop  32 . 1  according to the invention here has two fastening devices  38 , which in use setting  34  of the prop  32 . 1  are arranged at a vertical spacing from one another, for connection of means for safeguarding against falling down, in the form of railing elements  28 . In the illustrated exemplifying embodiment two respective substantially parallel railing rods  28 . 1 ,  28 . 2  are fastened to the fastening devices  38  of the props  32 . 1 , which here are outer or remote from the wall, in the horizontal installation or use setting  49  of the railing devices  28 . The other or inner posts  32 . 2  of the scaffolding standing frames  21  can, for example, be erected in the immediate vicinity of a wall (not shown), for example of a building, so that then on this side of the scaffolding  20 , as shown in  FIG. 1 , the means for securing against falling down or the railing devices  28  can be eliminated. 
     Each prop  32 ;  32 . 1 ,  32 . 2 ;  32 . 4  of the lowermost scaffolding tier or storey  22 . 1  is here plugged onto a so-called starting member  27 , which is usually formed by an upwardly pointing tubular support. The inner diameter of this tubular support is slightly larger than the outer diameter of the lower ends  37 . 1 ,  37 . 2  of the props  32 ;  32 . 1 ,  32 . 1 ,  32 . 4 , so that the props  32 ;  32 . 1 ,  32 . 1 ,  32 . 4  can each be plugged into one of these tubular supports of the starting members  27 . The starting members  27  are usually provided with a spindle and a spindle nut screwed thereon, whereby setting of the height or level of the props  32 ;  32 . 1 ,  32 . 1 ,  32 . 4  can be achieved. Each starting member  27  here has an apertured disc  30  provided with passages. The latter serve for wedge-fixing to the tubular supports of so-called horizontal rod elements  24 ,  25 , particularly longitudinal rails and transverse rails, provided with connecting heads. These connecting points are also termed connecting junctions  29 ,  29 ′. Longitudinal rails  24  and transverse rails  25  are usually used as rod elements. The longitudinal rails  24  and the transverse rails  25  are in that case respectively wedge-fixed in pairs to the tubular supports of the starting members  27  in such a manner that a stable rectangular base frame is constructed from two parallel longitudinal rails  24  and two transverse rails  25 , which are arranged perpendicularly thereto, but parallel to one another. Starting from this base frame, which is then constructed in a substantially horizontal plane, the scaffolding  20  is then built up to finished state. The props  32 ;  32 . 1 ,  32 . 1 ,  32 . 4 ,  32 . 5  are usually formed as tubes. 
     Covering units, preferably in the form of scaffolding floors  31 , which are provided with tread and/or work surfaces and which horizontally bound the respective storey or scaffolding tier  22 . 1 ,  22 . 2 ,  22 . 3 ,  22 . 4  in downward direction and upward direction, are mounted on or at the transverse arms  35 ;  35 . 1 ,  35 . 2 ,  35 . 2  of the scaffolding standing frames  21 ;  21 . 1 ,  21 . 2 . 
     Whilst the railing rods  28 . 1  and  28 . 2  offer protection against falling down on a longitudinal side, on the narrow transverse sides side railings  28 . 3 —here extending perpendicularly thereto—are fastened between the props  32 . 1  and  32 . 2  of the scaffolding standing frame  21  according to the invention, as shown in  FIG. 1  on the left. 
     The second scaffolding bay  23 . 2  shown in  FIG. 1  on the right is constructed with scaffolding elements of a modular scaffolding of the so-called Layher all-round modular scaffolding system. This comprises separate props  32 . 4  which are constructed as vertical posts and which in longitudinal direction are provided with a number of apertured discs spaced apart at the same grid spacing, here in each instance with four apertured discs. Longitudinal rails  24  and transverse rails  25  as well as optionally diagonal rails (not shown) are in usual manner wedge-fixed to these apertured discs with the help of known wedge connecting heads  275 . Each two of these posts  32 . 4  are connected in the region of the upper ends thereof with a horizontal rod element  25  which is typically a round bar or an upwardly open U-profile rail. Covering units in the form of scaffolding floors  31  can in turn be placed or hung on or at these transverse rails directly or, preferably, by way of suspension hooks. 
     The spacing of the apertured disc  30 , which is uppermost in use setting, of the respective post  32 . 4  from the lower end thereof corresponds with the spacing of the apertured disc  30 , which is fastened to the props  32 . 1  and  32 . 2  according to the invention of the scaffolding standing frames  21  according to the invention in the region of the upper ends  36 . 1 ,  36 . 2  thereof, from the lower ends  37 . 1 ,  37 . 2  of these props  32 . 1 ,  32 . 1 . In this manner it is thus readily possible to connect a scaffolding or a scaffolding bay  23 . 1 , which is formed by scaffolding standing frames  21 ;  21 . 1 ,  21 . 2  according to the invention or by props  32 ,  32 . 1 ,  32 . 2  according to the invention, with a scaffolding or a scaffolding bay  23 . 2  of a modular scaffolding without transition, so that a step-free transition between the covering units or scaffolding floors  31  of the first scaffolding bay  23 . 1  and the covering units or scaffolding floors  31  of the second scaffolding bay  23 . 2  is possible. 
     In the exemplifying embodiment shown in  FIG. 1  the railing rods or railing rails  28 . 4  of the modular scaffolding forming the second scaffolding bay  23 . 2  are directly fastened in the region of the fastening devices  38  according to the invention of the props  32 ;  32 . 1 ,  32 . 2  according to the invention, for example with the help of clampable apertured discs. In this manner the railing rods  28 . 1 ,  28 . 2  of the first scaffolding bay  23 . 1  are, for example, arranged slightly above the railing rods  28 . 4  of the second scaffolding bay  23 . 2  of the modular scaffolding, wherein this vertical spacing is of such small size that it impairs neither the use nor the safety of a ‘combination scaffolding’ constructed in this manner. 
     A first exemplifying embodiment of a scaffolding standing frame  21 . 1  according to the invention is shown in  FIG. 2 . This consists of two props  32 . 1 ,  32 . 2 , which are arranged to be parallel and in one plane and which in use setting  34  are constructed and arranged as vertical posts. In the region of their upper ends  36 . 1 ,  36 . 2  each prop  32 . 1 ,  32 . 2  has an apertured disc  30 , which discs in known manner are formed with passages for wedge-fixing of scaffolding elements, provided with connecting heads with a wedge. These apertured discs  30  here surround the respective post tube of the respective prop  32 . 1 ,  32 . 2  at a whole circumference. 
     The upper ends  36 . 1 ,  36 . 2  of the props  32 . 1 ,  32 . 2  are each formed with a respective tube connector  54 . 1 ,  54 . 2 , the outer diameter of which is slightly smaller than the inner diameter of the lower ends  37 . 1 ,  37 . 2  of the props  32 . 1 ,  32 . 2 . In this manner several such props  32 . 1 ,  32 . 2  or standing frames  21  can, as shown in  FIG. 1 , be plugged onto one another. 
     Arranged at the level of the two apertured discs  30  of the two props  32 . 1 ,  32 . 2  of the standing frame  21 . 1  is a transverse arm  35 . 1  which is permanently fastened to the props  32 . 1 ,  32 . 2 , here by welding, and the longitudinal axis of which extends perpendicularly to the longitudinal axes of the props  32 . 1 ,  32 . 2  in the same plane. This transverse arm  35 . 1  is here formed by a round tube, which is connected at it two ends, preferably integrally, with connecting heads  75 . 1  and  75 . 2  tapering in wedge shape towards the post and disc centre. These connecting heads or at least one of them is or are preferably produced by deforming the round tube. They have horizontal plug-on slots by which they are plugged onto the respective apertured disc  30  of the respective prop  32 . 1 ,  32 . 2  and then, in this plugged-on position, welded to the respective prop  32 . 1  and  32 . 2 . This scaffolding standing frame  21 . 1  is formed by a vertical frame element  105 . 1  which is formed by one prop  32 . 1  and the transverse arm  35 . 1  permanently fixed thereto, preferably by welding. With respect to the constructional details of vertical frame elements of that kind and the scaffolding standing frames and/or scaffoldings able to be constructed therefrom reference can be made for the sake of simplicity to European Patent Application No 06021346.9 and German Utility Model Application No 20 2006 015 586.4, the content of which is for the sake of simplicity adopted in its entirety at this point, so that thus the entire disclosure content of these two protective right applications is equally the subject of the invention described here. 
     A second exemplifying embodiment of a scaffolding standing frame  21 . 2  according to the invention is shown in  FIG. 3 . This differs from the scaffolding standing frame  21 . 1  shown in  FIG. 2  exclusively by the form of the transverse arm and the detail connection thereof to the two props  32 . 1  and  32 . 2 , so that with respect to the remaining details reference can be made to the foregoing explanations concerning the scaffolding standing frame  21 . 1 . Accordingly, in  FIG. 3  the same elements are provided with the same reference numerals as in  FIG. 2 . 
     The transverse arm  35 . 2  of the scaffolding standing frame  21 . 2  shown in  FIG. 3  is formed by an upwardly open U-profile tube or U-shaped transverse rail  35 . 2 . This is connected at its two ends, here integrally, with a crush profile connecting head  175 . 1 ,  175 . 2 . These connecting heads  175 . 1 ,  175 . 2  or at least one of them is or are also preferably produced by deforming the U-profile tube. Each of these connecting heads  175 . 1 ,  175 . 2  again has a horizontal plug-on slot by means of which the respective connecting head  175 . 1 ,  175 . 2  is plugged onto the respective apertured disc  30  of the respective prop  32 . 1 ,  32 . 2  and again welded there not only to the apertured disc, but also to the post to form a downwardly open U-shaped or H-shaped scaffolding standing frame  21 . 2  stiff in bending and torsion. 
     Each of the scaffolding standing frames  21 ;  21 . 1 ,  21 . 2  according to the invention thus comprises at least one prop  32 . 1  according to the invention of metal, which is designed as, in particular, a vertical post for scaffolding  20 , particularly for facade scaffolding, a stage, a staircase or like three-dimensional framework. The prop  32 . 1  according to the invention has a fastening device  38  according to the invention for fastening at least one railing device  28 , particularly a single or double railing, preferably a railing rod  28 . 1 ,  28 . 2 , to the prop  32 . 1 . This fastening device  38  comprises a mount  40  for the railing device  28 . The mount  40  is connected, here permanently by welding, to the prop  32 . 1 . The mount  40  comprises a rest element  42 , which extends in a first direction  41  transversely, preferably perpendicularly, to the longitudinal axis  33  of the prop  32 . 1  and away therefrom, with a rest surface  43 , which is horizontal in use setting  34  of the prop  32 . 1 , for vertical support of the railing device  28 . 
     The fastening device  38  further comprises a locking element  45 , which is connected—preferably captively—with the prop  32 . 1  and here designed with or as a locking lever  70 , with a locking surface  46 ;  46 . 1 ,  46 . 2  for—in a locking setting  47 —mechanically positive locking, preferably free of clamping force, of the railing device  28  against vertical lifting-off of the same in upward direction when the prop  32 . 1  is in use setting  34 . The locking element  45  is pivotable, preferably manually, about a pivot axis  50  from an open or unlocking setting  48  ( FIGS. 4 and 5 ) into a locking setting  47  ( FIGS. 1 ,  2 ,  3  and  6 ), here in downward direction when the prop  32 . 1  is in use setting  34 . 
     In the locking setting  47  the locking surface  46  of the locking element  45  is opposite the rest surface  43  of the rest element  42 . In both the locking setting  47  and use setting  34  of the prop  32 . 1  the locking surface  46  is arranged at a vertical spacing  51  above the rest surface  43  of the rest element  42 . Alternatively or, as here, additionally the pivot axis  50  in use setting  34  of the prop  32 . 1  is arranged at a vertical spacing  52  above the locking surface  46 , which is disposed in the locking setting  47 , and, preferably, here also at a vertical spacing  53  above the rest surface  43  of the rest element  42 . 
     As apparent particularly from  FIG. 4 , in the exemplifying embodiment the pivot axis  50  extends perpendicularly to the longitudinal axis  33  of the prop  32 . 1  and also perpendicularly to the first direction  41  by which the rest element  42  extends away from the prop  32 . 1 . 
     The mount  40  has a passage opening  57 , which is closed at the full circumference, for insertion of an end  58 . 1 ,  58 . 2  of the at least one railing device  28 , particularly of the railing rod  28 . 1 ,  28 . 2 , which is bounded by a support element  44 , which here extends parallel to the longitudinal axis  33  of the prop  32 . 1  in the use setting  34  thereof and here is integrally fastened to the rest element  42 , of the mount  40  for lateral support of the rest part  56  of the railing device  28  (see, in particular,  FIGS. 4 to 6 ). 
     The opening edge  61  of the passage opening  57 , which here is formed by the mount  40 —which is profiled to be U-shaped and formed as a stirrup  65 —on the one hand and the outer surface of the prop  32 . 1  on the other hand, spans a vertical opening plane, which here contains the longitudinal axis  33  of the prop  32 . 1 , when the prop  32  is in the use setting  34 . Accordingly, the passage opening  57  in use setting  34  of the prop  32 . 1  is here formed as a vertical receiving slot  63  extending in a direction parallel to the longitudinal axis  33  of the prop  32 . 1 . The mount  40  is formed with a stirrup  65  of flat material, which is here a punched part, but which can also be formed as, in particular, a cast part or forged part of metal. This stirrup  65  thus has the passage opening  57 , which is formed as a receiving slot  63 , for reception of the rest part  56  of the railing device  28  or bounds this passage opening  57 . The stirrup  65  is arranged parallel to the longitudinal axis  33  of the prop  32 . 1  and the limbs thereof are welded to the prop  32 . 1 . 
     The locking element  45  is here designed with a manually actuable locking lever  70 , which here is fastened to the limb, which is upper in use setting  34  of the prop  32 . 1 , of the mount  40  with the help of fastening means which here is formed as a rivet  66  and contains the pivot axis  50 . The locking lever  70  is preferably formed from plastics material. As apparent particularly from  FIGS. 7   a  to  7   c  as well as  8   a  and  8   e  in conjunction with  FIGS. 4 to 6 , the locking lever  70  has a longitudinal slot  71  which extends perpendicularly to the pivot axis  50  and in which in the locking setting  40  of the locking lever  70  a major part of the vertical support element  44  of the mount  40  or of the stirrup  65  is received. The locking lever  70  consists of an articulation and locking part  62  and an actuating part  60  which is connected with this as one part or integrally. The part  60  tapers towards its free end to be concavely radiussed in order in this manner to be able to achieve an advantageous gripping by a finger of a hand of an actuating person for the purpose of simple transfer of the locking lever  70  from its locking setting  47  upwardly into its unlocking setting or open setting  48 . 
     The articulation and locking part  62  of the locking lever  70  comprises an opening which in mounting setting contains the pivot axis  50  and through which a part of the rivet  60  is inserted. The articulation and locking part  62  further comprises a pressing body  72  which is formed as an eccentric body  76  and which on pivotation of the locking lever  70  from the unlocking setting  48  into the locking setting  47  goes into engagement or is in engagement with a counter-body  73  which is here formed as a cylindrical pin  77 . The counter-body  73  is firmly fastened, preferably permanently, to the support element  44  in such a manner that it extends on both sides of the side surfaces of the stirrup  65  beyond this. In that case the longitudinal axis  78  of the pin  77  is arranged perpendicularly to the longitudinal axis  33  of the prop  32 . 1  and parallel to the pivot axis  50 . The longitudinal axis  78  of the pin  77  further extends perpendicularly to the first direction  41  by which the rest element  42  extends away from the prop  32 . 1 . 
     The pressing body  72  designed as an eccentric body  76  and the counter-body  73  designed as a cylindrical pin  77  are formed to be matched to one another in such a manner that on pivotation of the locking element  70  from the unlocking setting  48  into the locking setting  47  a pressing force, which hinders unintended unlocking of the locking lever  70 , is formed between the pressing body  72  and the counter-body  73 . In that case the pressing body  72  of the locking lever  70  is designed as an eccentric body  76  arranged eccentrically with respect to the pivot axis  50 . 
     As apparent from, for example,  FIGS. 8   c  and  8   f , the locking lever  70  has in the region of its transition between the actuating part  60  and the articulation and locking part  62  a detent recess  79  which outwardly adjoins the eccentric body  76  and in which the pin  77 , which is fastened to the support element  44  of the mount  40 , engages in detenting manner in the locking setting  47 . 
     The invention also relates to a connecting arrangement for a railing device  28 , which comprises at least one prop  32 . 1  for scaffolding  20 , particularly facade scaffolding, a stage, a staircase or like three-dimensional framework and a railing device  28 , which is formed particularly as a single or double railing and preferably designed with or as a railing rod  28 . 1 ,  28 . 2  and which is fastenable to the prop  32 . 1  with the help of the fastening device  38 . 
     In this connecting arrangement  80  the locking surface  46  of the locking element  45  in the locking setting  47  is opposite the rest surface  43  of the rest element  42  and the locking surface  46  is, in the locking setting  47  as well as in use setting  34  of the prop  32 . 1 , arranged at a vertical spacing  51  above the rest surface  43  of the rest element  42  which is greater than the height  67  of the rest part  56 , which rests on a rest surface  43  of the rest element  42  of the mount  40 , of the railing device  28 . In addition, the pivot axis  50  in use setting  34  of the prop  32  is arranged at a vertical spacing  52  above the locking surface  46  disposed in the locking setting  47  and also at a vertical spacing  53  above the rest surface  43  of the rest element  42 . This spacing  53  is greater than the height  67  of a or the rest part  56 , which rests on the rest surface  43  of the rest element  42  of the mount  40 , of the railing device  28 . 
     The invention also comprises a connecting arrangement  80  for a railing device  28 , which comprises at least one prop  32 . 1  according to the invention, particularly a vertical post, of metal, for scaffolding  20 , particularly facade scaffolding, a stage, a staircase or like three-dimensional framework and at least one railing device  28 , which is formed as, in particular, a single or double railing and preferably formed with or as a railing rod  28 . 1  and which is fastenable with the help of a fastening device  38  to the prop  32 . 1 , wherein the prop  32 . 1  comprises a mount  40  for the railing device  28 , wherein the mount  40  is connected or fastened, preferably captively, especially permanently, for example by welding, with or to the prop  32  and wherein the mount  40  comprises a rest element  42 , which extends in a first direction  41  transversely, preferably perpendicularly, to the longitudinal axis  33  of the prop  32  and away therefrom, with a rest surface  43 , which is horizontal in use setting  34  of the prop  32 . 1 , for vertical support of the railing device  28 , on which rest surface a rest part  56 , which is preferably arranged in the region of an end  58 . 1 ,  58 . 2  of the railing device  28  or of the railing rod  28 . 1 ,  28 . 2 , of the railing device  28  can be supported, and wherein the fastening device  38  further comprises a locking element  45 , which is firmly connected, preferably captively, with the prop  32 , with a locking surface  46  for mechanically positive locking, preferably free of clamping force, of the railing device  28  against vertical removal thereof in upward direction when the prop  32  is in use setting  34 , wherein the locking element  45  is pivotable, preferably manually, about a pivot axis  50  from an unlocking setting  48 , in which the railing device  28  can be placed on the rest surface  43  of the rest element  42  of the mount  40  or removed from the mount  40 , into a locking setting  47 , and conversely, in which the railing device  28  is locked by means of the locking element  45  against removal from the mount  40  in at least one direction and in which the railing device  28  is secured against removal from the mount in any directions, wherein the locking element  45  is transferable from a locking setting  47 , in which the railing device  28  is mechanically positively locked, preferably free of clamping force, against removal from the mount  40  in—when the prop  32 . 1  is in use setting  34 —upward direction, preferably parallel to the longitudinal axis  53  of the prop  32 . 1 , into an unlocking setting  48 , and conversely, in which the railing device  28 , without prior lifting-off in the first direction  41  from the rest surface  43  of the rest element  42 , is—in use setting  34  of the prop  32 —removable from the mount at least horizontally in a second direction  55  transversely, preferably perpendicularly, to the longitudinal axis  33  of the prop  32 , and also transversely, preferably perpendicularly, to the first direction  41 , preferably after prior vertical lifting-off, in a given case carried out within the limits predetermined by the mount  40  and especially only lightly or slightly, from the rest surface  43  of the rest element  42  in upward direction. 
     In the exemplifying embodiment the fastening device  38  and the railing device  28  are designed to be matched to one another in such a manner that the railing device  28  can—even though the locking element  45  is disposed in the locking setting  47 —when the prop  32  is in use setting  34  be placed from below, particularly obliquely from below, on the rest surface  43  of the rest element  42  of the mount  40  or hung there, and starting from this setting is pivotable upwardly and transferable to an installation setting  49  in which the railing device  28  is secured against removal from the mount  40  in any directions. 
     As apparent from, for example  FIG. 10 , the mount  40  has a passage opening  57 , which is enclosed at the full circumference, in the form of a receiving slot  63  for insertion of an end  58 . 1 ,  58 . 2  of the at least one railing device  28  or railing rod  28 . 1 ,  28 . 2 , through which the end  58 . 1 ,  58 . 2  of the railing device  28  or railing rod  28 . 1 ,  28 . 2  is inserted (cf.  FIGS. 5 and 6 ). 
     The passage opening  57  is, in use setting  34  of the prop  32 , formed as a vertical receiving slot  63  which extends parallel to the longitudinal axis  33  of the prop  32  and into or through which the rest part  56  of the railing device  28 , here the end  58 . 1 ,  58 . 2  of a railing rod  28 . 1 ,  28 . 2  or the two railing rods  28 . 1 ,  28 . 2 , is inserted ( FIGS. 5 and 6 ). 
     The receiving slot  63  has a height  68  which is greater than the width or the height  67  of at least one end  58 . 1 ,  58 . 2  of the ends  58 . 1 ,  58 . 2  of the railing device  28  or of the railing rod  28 . 1 ,  28 . 2 . In addition, the passage opening  57  has a width  59  which is greater than the thickness or width  82  of the rest part  56  of the railing device  28  or of the railing rod  28 . 1 ,  28 . 2 . In the exemplifying embodiment the passage opening  57  has a width  59  which is slightly greater than twice the thickness or width  82  of the rest part  56  of the railing device  28  or railing rod  28 . 1 ,  28 . 2 , so that up to two railing devices  28 ,  28  or railing rods  28 . 1 ,  28 . 2  of that kind can thus be hung in the mount  40  and locked by means of the locking lever  40 . 
     The ends  58 . 1 ,  58 . 2 , which are intended for support on the rest element  42  of the mount  40 , of the railing device  28 , which is preferably formed as or with a railing rod  28 . 1 ,  28 . 2 , are formed to be flattened. 
     The detail design of a railing element according to the invention, here a railing rod  28 . 1  or  28 . 2  according to the invention, is described in the following with reference to  FIG. 9 . 
     The railing device  28  has in the region of at least one end  58 . 1 ,  58 . 2 , here in the region of its two flattened ends  58 . 1 ,  58 . 2 , a respective first recess  86  which extends parallel to the longitudinal axis  83  of the end  58 . 1 ,  58 . 2  or of the railing rod  28 . 1 ,  28 . 2  and is bounded inwardly by the rest part  56  for support on the rest surface  43  of the rest element  42  of the mount  40  and which is open outwardly or transversely or perpendicularly to the longitudinal axis  83  of the railing device  28 . This recess is bounded by a first wall part  87 , which extends transversely, here approximately perpendicularly, to the longitudinal axis  83  of the end  58 . 1 ,  58 . 2  or of the railing device  28 , here the railing rod  28 . 1 ,  28 . 2 , and which here is defined in the form of a hook-shaped lug  88 . 
     The first recess  86  is bounded in the direction of the longitudinal axis  83  by two spaced-apart wall parts  87  and  89 . The wall part  89  is concavely rounded (at  91 ) and the wall part  87  bounding the lug  88  is formed with an entry chamfer  92 . A second recess  94  adjoins the first wall part  87  or the lug  88  in the region of the first recess  86 . This recess  94  is bounded by a rest surface  95 , which here extends parallel to the longitudinal axis  83  of the railing device  28  or of the railing rod  28 . 1 ,  28 . 2  and which is deepened by comparison with the first recess  86 , of the rest part  56  and two support surfaces  97 . 1 ,  97 . 2  which here are parallel and have a support surface spacing  98  from one another. These support surfaces  97 . 1 ,  97 . 2  here extend perpendicularly t o the longitudinal axis  83  of the end  58 . 1 ,  58 . 2  or of the railing device  28  or of the railing rod  28 . 1 ,  28 . 2 . The support surface spacing  98  of these support surfaces  97 . 1 ,  97 . 2  is greater than the width  99  of the rest element  42  of the mount  40  in the region of the rest surface  43  of the rest element  42 , so that the railing device  28  or the respective railing rod  28 . 1 ,  28 . 2  can there mechanically positively detent by its second recess  94 . 
     The support surface spacing  98  is preferably approximately 1.5 to 3 times the width  99  of the rest element  42  in the region of the rest surface  43  thereof so as to be able to provide compensation for production and, in particular, assembly tolerances, so that it is always ensured that the railing device  28  or the railing rod  28 . 1 ,  28 . 2  can in every case be reliably and securely hung in the region of its two ends  58 . 1 ,  58 . 2  in a respective mount  40  of a prop  32 . 1  according to the invention in installed or use setting  49 . 
     The length  93  of the first recess  86  extending in the direction of the longitudinal axis  83  of the end  58 . 1 ,  58 . 2  or of the railing rod  28 . 1 ,  28 . 2  is very much greater than the spacing  100 , which is measured in the same direction, between the support surface  97 . 2 , which is associated with the free end  101  of the respective end  58 . 1 ,  58 . 2  of the railing device  28  or of the railing rod  28 . 1 ,  28 . 2 , of the second recess  94  and this free end  101  of the railing device or of the railing rod  28 . 1 ,  28 . 2 . 
     A significant feature of the connecting arrangement according to the invention is also that the spacing  51  between the rest surface  43  of the rest element  42  and the locking surface  46  of the locking element  45  in the locking setting  47  is greater than the greater spacing between the surface  90 , which faces away from the free end  101  of the railing device  28  or of the railing rod  28 . 1 ,  28 . 2  and which bounds the first recess  86 , of the first wall part  87  or of the lug  88  this free end  101  of the railing device  28  or of the railing rod  28 . 1 ,  28 . 2 , in particular is greater than the greatest spacing  102  between the support surface  97 . 2 , which faces away from the free end  101  of the railing device  28  or of the railing rod  28 . 1 ,  28 . 2  and which bounds the second recess  94 , and this free end  101  of the radial device  28  or of the railing  28 . 1 ,  28 . 2 . 
     A second exemplifying embodiment of a prop or fastening device according to the invention for fastening railing devices is illustrated together with its parts in  FIGS. 11 to 18 . In that case, parts which are the same by comparison with the previously discussed exemplifying embodiments are denoted by the same reference numerals. In this second exemplifying embodiment the mount  140  or the stirrup  165 , the locking element  145  or the locking lever  170 , the fastening means  66  containing the pivot axis  50  and also the railing device  128 ;  128 . 1 ,  128 . 2  are designed slightly differently from the afore-described parts  40  or  65 ,  45  or  70 , or  166  and  28 ;  28 . 1 ,  28 . 2 . However, it will be obvious that, in particular, the fastening means and/or the railing device can also be designed the same as in the afore-described exemplifying embodiments. 
     The exact form of the locking lever  170 , which functions as locking element  145 , according to the second exemplifying embodiment is shown in, in particular,  FIGS. 12   a  to  12   d  and  13   a  to  13   f . This exemplifying embodiment differs from the first exemplifying embodiment, which is shown in particular in  FIGS. 7   a  to  7   d  and  8   a  and  8   f , in that a recess  210 , which is here delimited approximately at right angles, is provided in the region of the articulation and locking part  162  facing the post  32 . 1  in the opening setting  48  and between the pivot axis  50  and the locking surface  46 ;  46 . 1 ,  46 . 2 . The inner contour of this recess  210  corresponds with the inner contour of the passage opening  57  of the mount  140  in the region of the upper end thereof. This has the consequence in the open setting of the locking lever  170  shown in  FIG. 11  that the receiving slot  63  or the passage opening  57  is not covered or concealed by parts of the locking lever  170 . As a result, it is achieved in this open setting  48  that the complete opening cross-section of the passage opening  57  or of the receiving slot  63  remains free for hanging railing devices or railing rods  28  or  128  in place or removing them from being hung. In this manner the hanging in place of the railing devices or removal thereof from being hung can be facilitated, because in that case obstructions cannot arise due to any parts of the locking lever protruding into the passage opening  57  or receiving slot  63 . 
     In order to ensure that the locking lever  170  in the open setting  48  shown in  FIG. 11  does not nevertheless partly protrude into the passage opening  57  or the receiving slot  63  due to gravitational force the form or contour of the pressing body  172  is slightly changed in the locking lever  170  by comparison with the locking lever  70 . The pressing body  177  is now shaped in such a manner that, as shown in  FIG. 16 , in the said or desired open setting  48  it bears against the counter-body  73 , which is formed as a pin. In this manner, in this open setting  48  a (further) pivotation of the locking lever  170  in downward direction due to gravitational force is prevented. For this purpose the pressing body  172  is here no longer shaped as an eccentric body. Nevertheless, the pressing body  172  is also formed in this exemplifying embodiment with a convexly outwardly curving pressing wall which is separated from a slot  85  from the rest of the rearward part of the articulation and locking part  162 . In this manner the pressing body  172  in the course of a desired manual pivotation of the locking lever  170  can also be resiliently pressed back from the open or unlocking setting shown in  FIGS. 11 ,  16  and  17  into the closing or locking setting  47  shown in  FIG. 18  with exertion of a defined pivoting force, so that it can pass the pin  77  functioning as counter-body  73 . 
     Apart from the afore-described measures, in this second exemplifying embodiment further measures are also provided by which it is ensured that the locking lever  170 , considered from its closing or locking setting  47 , can be pivoted upwardly about its pivot axis  50  only through a specific maximum opening angle  265 . This maximum opening angle  265  is preferably smaller than 60 degrees, particularly smaller than or equal to approximately 45 degrees (see, in particular,  FIG. 17 ). As a result, excessive jutting-out of the locking lever  170  in its open setting  48  can be avoided, whereby the risk of persons possibly being caught at the locking lever  170  disposed in the open or unlocking setting  48  can accordingly be reduced. As a further measure of that kind it is initially provided that the locking lever  170  has an abutment body  209  which extends horizontally between the bearing bodies  208 . 1  and  208 . 2  separated by the longitudinal slot  71 . In addition, it is provided that the mount  140  has at its upper end a lug  206  which—or the outer surface of which facing away from the post  32 . 1 —forms an abutment  207  for the abutment body  209  of the locking lever  170  ( FIG. 17 ). The abutment  207  of the mount  140  and the abutment body  209  of the locking lever  170  are formed to be matched to one another in such a manner that the locking lever  170 , as previously explained, can be pivoted upwardly about its pivot axis  50  only through a specific maximum opening angle  265 , which here is approximately 45 degrees. 
     According to the second exemplifying embodiment the locking lever  170  is no longer fastened and mounted on the mount  140  with the help of a rivet functioning as fastening means, but with the help of a pin  166  which similarly functions as fastening means and which here is formed as a dowel pin  166 , which—preferably over its entire length—is, in particular, slotted and preferably hollow or sleeve-shaped. This can be seen particularly readily in  FIG. 18 . The dowel pin  166  is clamped in force-locking manner at a bore, which receives this, of the mount  140 . The locking lever  170  is mounted on the thus-clamped dowel pin  166  to be rotatable about its pivot axis  50 . For this purpose the two bearing bodies  208 . 1  and  208 . 2  of the locking lever  170  each have a bearing bore or bore  211 . 1  and  211 . 2 , the inner diameter of which is slightly greater than the outer diameter of the dowel pin  166  in these regions. It will be obvious that other pins or bolts can also be provided instead of a dowel pin, for example a grooved pin. This can be provided centrally with a thickening which when knocked into the bore of the mount  140  is then clamped there with a press fit. Constructions of that kind can be more simply produced by comparison with a fastening by a rivet and in a given case even releasable again and moreover are also more economic. 
     A second exemplifying embodiment of a railing device  128 ;  128 . 1 ,  128 . 2  is illustrated in, in particular,  FIG. 14 . The railing rod  128 ;  128 . 1 ,  128 . 2  shown there differs from the railing rod  28 ;  28 . 1 ,  28 . 2  shown in  FIG. 9  essentially by a deeper and wider recess  194 . This thus has a greater width or a greater support surface spacing  198  and a greater depth  103 . By comparison with the railing rod  28 ;  28 . 1 ,  28 . 2  shown in  FIG. 9  the greater depth  103  of the second recess  194  of the railing rod  128 ;  128 . 1 ,  128 . 2  was achieved in that the depth  204  of the rest surface  196  was correspondingly reduced. The greater width or the greater support surface spacing  198  was, starting from the railing rod  28 ;  28 . 1 ,  28 . 2  shown in  FIG. 9 , achieved in that material was removed in the region of the support surface  97 . 1  there so that the position of the support surface  97 . 1  has thus changed with the railing rod  128 ;  128 . 1 ,  128 . 2 . Due to the greater depth  104  of the notch or of the second recess  94  a user can now better or more easily sense, when hanging the railing rods  128 ;  128 . 1 ,  128 . 2  in place, whether or that or if the railing sits in the correct position during introduction or insertion. In other words, the detenting or notching of the railing rod  128 ;  128 . 1 ,  128 . 2  at the desired detent position is now better and more securely possible. Due to the greater width of the notch or greater to the greater support surface spacing  198  of the support surfaces  97 . 1  and  97 . 2 , which bound the second recess, a greater tolerance is achieved relative to any different spacings, which may occur during setting up of the props  32 ;  32 . 1 ,  32 . 2 , between two props  32 . 32  or scaffolding frames  21 - 21 , at or between which a railing rod  128 ;  128 . 1 ,  128 . 2  is hung, so that jamming or a possibility of hanging in place the railing rods only by a greater exertion of force cannot arise. The railing rod  128 ;  128 . 1 ,  128 . 2  is otherwise unchanged by comparison with the railing rod  28 ;  28 . 1 ,  28 . 2  shown in  FIG. 9 . 
     A further prop according to the invention in shown in  FIG. 19 , which is designed with a fastening device according to the invention in accordance with a third exemplifying embodiment, which fastening device has a pivotable locking lever  170  in accordance with the second exemplifying embodiment, with a mount  240  according to a third exemplifying embodiment. By contrast to the second exemplifying embodiment, which is shown in, in particular,  FIG. 11 , of a mount  140  the mount  240  according to  FIG. 19  is designed to be slotted (horizontal slot or gap  264 ), but nevertheless has a passage opening  57  (receiving slot  63 ), which is closed or surrounded substantially at the whole circumference, for insertion of an end ( 58 . 1 ,  58 . 2 ) of the at least one railing device ( 28  or  128 ). The mount  240  is designed to be matched by its slot  264  to the railing device in such a manner that the railing device  28 ,  128  inserted into or hung in place in the passage opening  57  also cannot be unhung or withdrawn or removed from the mount  240  through the slot  264  when the locking element or the locking lever is disposed in an or its open or unlocking setting. 
     The slot or gap  264  separates the stirrup, which in the first and second exemplifying embodiment is continuous without slotting or interruption, into two parts, namely into a lower element, which comprises the rest element  42  and a lower support element  244 . 1 , and an upper element, which comprises an upper support element  244 . 2  and a fastening body  192 . The mutually opposite ends of the support elements  244 . 1  and  244 . 2  have a mutual spacing  243  corresponding with the width of the slot or gap  264 . The mount  240  is formed with a lower receiving profile  242 , which includes the lower support element  244 . 1 , for reception and support of the railing device  28 ;  128 . The receiving profile  242  is fastened permanently, preferably by welding, to the post  32 . 1  at the end of the receiving profile facing away from the end of the support element  244 . 1  bounding the slot or gap  243 . The fastening body  192  here integrally connected with the other or upper support element  244 . 2  is similarly fastened permanently, preferably by welding, to the post  32 . 1  at the end of the fastening body facing away from the end of the support element  244 . 2  bounding the slot or gap  243 . In this manner the locking lever  170  is, by contrast to the aforesaid exemplifying embodiments of a mount  40 ,  140 , now fastened not to the part of the mount  240  containing the receiving element  24  and also not to a support element of the support elements  244 . 1 ,  244 . 2  of the mount  240 , but to a or the separate fastening body  192  here preferably integrally connected with an or the upper support element  244 . 2 . It will be obvious that for a mount designed in accordance with or similar to the third exemplifying embodiment of a mount  240  it is also possible to provide a locking lever  70  designed in accordance with the first exemplifying embodiment or a similarly designed locking lever. 
     The invention also relates to a scaffolding frame, particularly a standing scaffolding frame  21 ;  21 . 1 ,  21 . 2 , with at least one prop  32 . 1  according to the invention and with at least one transverse arm  35 ;  35 . 1 ,  35 . 2 , which is fastened, preferably captively, in particular permanently, for example by welding, to the at least one prop  32 . 1 . 
     The invention further relates to a scaffolding frame, particularly a standing scaffolding frame  21 ;  21 . 2 ,  21 . 2 , with at least one connecting arrangement  80  according to the invention, wherein at least one transverse arm  35 ;  35 . 1 ,  35 . 2  is fastened, preferably captively, in particular permanently, for example by welding, to the at least one prop  32 . 1 . 
     The invention also relates to scaffolding  20 , particularly building scaffolding, with at least four vertical props  32 ;  32 . 1 ,  32 . 2 ;  32 . 4 ,  32 . 5 , on which preferably at least one covering unit, for example a scaffolding floor  31 , horizontal rod elements  24 ,  25  and/or at least one diagonal element  26  for stiffening of the scaffolding  20 , are mounted, and with at least one prop  32 . 1 ,  32 . 3  according to the invention and/or with at least one connecting arrangement  80  according to the invention and/or with at least one vertical frame element  105 . 1 ,  105 . 2  according to the invention and/or with at least one scaffolding frame according to the invention. 
     It is a further important feature of the invention that the railing device  28 ,  128 , particularly the railing rods  28 . 1 ,  28 . 2 ,  128 . 1 ,  128 . 2  can be installed not only from the same scaffolding tier or storey  22 . 1  to  22 . 4  as shown in  FIGS. 20 to 22 , but also if needed—in order to create an advance railing—from a or the scaffolding tier or storey disposed thereunder, as shown in  FIGS. 23 to 30 . 
     A method according to the invention for installation of a railing device  28 ,  128  from the same scaffolding tier can be defined as follows: 
     Method of fastening at least one railing device  28 ,  128  with the help of a fastening device  38  to a prop  32 . 1 ,  32 . 3  for scaffolding  20 , a stage, a staircase or like three-dimensional framework, wherein the fastening device  38  comprises a mount  40 ,  140 ,  240  for the railing device  28 ,  128  and wherein the mount  40 ,  140 ,  240  is connected or fastened, preferably captively, in particular permanently, preferably by welding, with or to the prop  32 . 1 ,  32 . 3 , particularly a prop  32 . 1 ,  32 . 3  according to the invention, preferably a vertical post, of metal, which mount comprises a rest element  42 , which extends in a first direction  41  transversely, preferably perpendicularly, to the longitudinal axis  33  of the prop  32 . 1 ,  32 . 3  away therefrom, with a rest surface  43  for vertical support of the railing device  28 ,  128 , which is formed in particular as a single or double railing and preferably with or as a railing rod  28 . 1 ,  28 . 2 ;  128 . 1 ,  128 . 2  and which preferably forms a part of a connecting arrangement  80 , particularly a connecting arrangement  80  according to the invention, wherein a rest part  56 ,  156 , which is preferably arranged in the region of an end  58 . 1 ,  58 . 2  of the railing device  28 ,  128  or of the railing rod  28 . 1 ,  28 . 2 ;  128 . 1 ,  128 . 2 , of the railing device  28 ,  128  can be supported on the rest surface  43  of the rest element  42 , and wherein the fastening device  38  further comprises a locking element  45 ,  145 , which is firmly, preferably captively, connected with the prop  32 . 1 ,  32 . 3  and preferably formed with or as a locking lever  70 ,  170 , with a locking surface  46  for mechanically positive locking, preferably free of clamping force, of the railing device  28 ,  128  against vertical removal thereof in upward direction when the prop  32 . 1 ,  32 . 3  is in use setting  34 , and wherein the locking element  45 ,  145  is pivotable, preferably manually, in particular in downward direction in use setting  34  of the prop  32 , about a pivot axis  50  from an unlocking setting  48 , in which the railing device  28 ,  128  can be placed on the rest surface  43  of the rest element  42  of the mount  40 ,  140 ,  240  or removed from the mount  40 ,  140 ,  240 , into a locking setting  47 , and conversely, in which the railing device  28 ,  128  is locked by means of the locking element  45 ,  145  against removal from the mount  40 ,  140 ,  240  at least in one direction and in which the railing device  28 ,  128  is secured against removal in any directions from the mount  40 ,  140 ,  240 , wherein the railing device  28 ,  128  is placed or plugged—before the locking element  45 ,  145  has been transferred into its locking setting  47 , or in unlocking setting  48 —horizontally in a second direction  55  transversely, preferably perpendicularly, to the longitudinal axis  33  of the prop  32 . 1 ,  32 . 3  and also transversely, preferably perpendicularly, to the first direction  41  on or onto the rest surface  43  of the rest element  42  of the mount  40 ,  140 ,  240  and subsequently the locking element  45 ,  145  is transferred to its locking setting  47  in which the railing device  28 ,  128  is mechanically positively locked, preferably free of clamping force, by means of the locking element  45  against removal from the mount  40 ,  140 ,  240  upwardly in the direction of, preferably parallel to, the longitudinal axis  33  of the prop  32  when the prop  32  is in use setting  34  (see  FIGS. 20 to 22 ). 
     For installation of the railing device  28 ,  128  or the railing rods  28 . 1 ,  28 . 2 ;  128 . 1 ,  128 . 2  from the same scaffolding tier the locking levers  70 ,  170  at the props  32 . 1  or at the standing frames  21 ;  21 . 1 ,  21 . 2  are thus to be opened or transferred to their unlocking setting  48 , insofar as this is not the case. 
     The installation of a railing device  28 ,  128  at the mounts  40 ,  140 ,  240  of two adjacent props  32 . 1 ,  32 . 3  can then be carried out in such a manner that the railing device  28 ,  128  or the railing rod  28 . 1 ,  28 . 2 ;  128 . 1 ,  128 . 2  is initially placed in the region of a rest surface  96 ,  196  of the first recess  86 ,  186  of a first end  58 . 1  of its ends  58 . 1 ,  58 . 2  on the rest surface  43  of the rest element  42  of the mount  40 ,  140 ,  240  of a first prop  32 . 1 ,  32 . 3 , preferably horizontally in the use setting  34  thereof, wherein the locking element  45 ,  145  of the fastening device  38  of the first prop  32  is disposed in its unlocking setting  48  (see  FIG. 20 ), and that subsequently the railing device  28 ,  128  or the railing rod  28 . 1 ,  28 . 2 ;  128 . 1 ,  128 . 2  is displaced in the direction  64  of the mount  40 ,  140 ,  240  of the adjacent second prop  32 . 1 ,  32 . 3  until the respective rest surface  95 ,  195  of the respective second recess  94 ,  194  of the other end  58 . 2  of this railing device  28 ,  128  or this railing rod  28 . 1 ,  28 . 2 ;  128 . 1 ,  128 . 2  comes to lie on the associated rest surface  43  of the respective rest element  42  of the respective mount  40 ,  140 ,  240  with formation of a mechanically positive connection between the railing device  28 ,  128  and the two props  32 . 1 ,  32 . 3 ;  32 . 1 ,  32 . 3  (see  FIG. 21 ), and that subsequently the locking elements  45 - 45 ;  145 - 145  of the fastening device  38 - 38  of the two props  32 . 1 ,  32 . 3 ;  32 . 1 ,  32 . 3  are pivoted into their locking setting  47  (see  FIG. 22 ). The railing device  28 ,  128  is thus installed in that it is pushed on one side into the cut-out or first recess  86 ,  186  over the suspension point defined by the second recess  94 ,  194  (see  FIG. 20  and there the arrow  55 ), then inserted on the other side and subsequently then pulled back until the railing device  28 ,  128  then locks or detents at its two suspension points or at its two second recesses  94 ,  194  at the rest elements  42  of the mounts  40 ,  140 ,  240 , so that subsequently the rest surfaces  95 ,  195  of the two second recesses  94 ,  194  of the railing device  28 ,  128  lie on the rest surfaces  43  of the rest elements  42  of the mounts  40 ,  140 ,  240  of the two adjacent props  32 . 1 ,  32 . 3 ;  32 . 1 ,  32 . 3  (see  FIG. 21 ). After installation of this railing device  28 ,  128  or after installation of all railing devices  28  of a scaffolding tier or story  22 . 1  to  22 . 4  the locking levers  70 ,  170  are then to be closed, i.e. to be transferred to the respective locking settings  47  thereof, preferably in that they are pivoted downwardly about their pivot axes  50  from their unlocking or open settings  48 , as for example, depicted in  FIG. 22 . 
     For installation of the railing device  28 ,  128  or the railing rods  28 . 1 ,  28 . 2 ;  128 . 1 ,  128 . 2  from the or a scaffolding tier or story disposed thereunder it does not matter whether the locking lever  70 ,  170  is disposed in open or unlocked state or in closed or locked state. For introduction or hanging in place of the railing device  28 ,  128  or of the railing rods  28 . 1 ,  28 . 2 ;  128 . 1 ,  128 . 2  from below, particularly obliquely from below, it is ensured, when the locking lever  70 ,  170  is closed, thus disposed in its locking setting  47 , that due to the geometry of the cut-outs or recesses, particularly in the region of the second recess  94 ,  194  of the ends  58 . 1 ,  58 . 2  of the railing device  28 ,  128  or of the railing rod  28 . 1 ,  28 . 2 ;  128 . 1 ,  128 . 2  in conjunction with the geometry of the mount  40 ,  140 ,  240  and of the locking lever  70 ,  170 , that no collisions occur here, but that the railing device  28 ,  128  or the railing rods  28 . 1 ,  28 . 2 ;  128 . 1 ,  128 . 2  can then be readily brought, by way of an upward displacement or upward pivotation, into a level or horizontal position and then also equally secured there (see  FIGS. 23 to 26 ). This can thus be carried out particularly simply and economically if a locking lever  70 ,  170  is already closed, thus already disposed in its locking setting  47 . Accordingly, the invention also relates to a method of fastening at least one railing device  28 ,  128  with the help of a fastening device  38  to a prop  32  for scaffolding  20 , a stage, a staircase or like three-dimensional framework, wherein the fastening device  38  comprises a mount  40 ,  140 ,  240  for the railing device  28 ,  128  and wherein the mount  40 ,  140 ,  240  is connected, preferably captively, in particular permanently, for example by welding, with the prop  32 , in particular a prop  32 . 1  according to the invention, preferably a vertical post, of metal, which mount  40 ,  140 ,  240  comprises a rest element  42 , which extends in a first direction  41  transversely, preferably perpendicularly, to the longitudinal axis  33  of the prop  32  away therefrom, with a rest surface  43  for vertical support of the railing device  28 ,  128 , which is formed in particular as a single or double railing and preferably with or as a railing rod  28 . 1 ,  28 . 2 ;  128 . 1 ,  128 . 2  and which preferably forms a part of a connecting arrangement , particularly a connecting arrangement  80  according to the invention, wherein a rest part  56 ,  156 , which is preferably arranged in the region of an end  58 . 1 ,  58 . 2  of the railing device  28 ,  128  or of the railing rod  28 . 1 ,  28 . 2 ;  128 . 1 ,  128 . 2 , of the railing device  28 ,  128  can be supported on the rest surface  43  of the rest element  42 , and wherein the fastening device  38  further comprises a locking element  45 ,  145 , which is firmly, preferably captively, connected with the prop  32  and preferably formed with or as a locking lever  70 ,  170 , with a locking surface  46  for mechanically positive locking, preferably free of clamping force, of the railing device  28 ,  128  against vertical removal thereof in upward direction when the prop  32  is in use setting  34 , and wherein the locking element  45 ,  145  is pivotable, preferably manually, in particular in downward direction in use setting  34  of the prop  32 , about a pivot axis  50  from an unlocking setting  48 , in which the railing device  28 ,  128  can be placed on the rest surface  43  of the rest element  42  of the mount  40 ,  140 ,  240  or removed from the mount  40 ,  140 ,  240 , into a locking setting  47 , and conversely, in which the railing device  28 ,  128  is locked by means of the locking element  45 ,  145  against removal from the mount  40 ,  140 ,  240  at least in one direction and in which the railing device  28 ,  128  is secured against removal in any directions from the mount  40 ,  140 ,  240 , wherein the railing device  28 ,  128  is—when the locking element  45 ,  145  is disposed in its locking setting  47  and when the prop  32 . 1 ,  32 . 3  is in use setting  34 —placed or hung in place on the rest surface  43  of the rest element  42  of the mount  40 ,  140 ,  240  from below, particularly obliquely from below, in a direction transverse, preferably perpendicular, to the first direction  41 , preferably approximately in a mounting plane containing a parallel to the longitudinal axis  33  of the prop  32  and a notional normal to the first direction  41 , and is subsequently pivoted upwardly and transferred to a horizontal installation setting  49  in which the railing device  28 ,  128  is mechanically positively locked, preferably free of clamping force, by means of the locking element  45 ,  145  against removal from the mount  40 ,  140 ,  240  upwardly in the direction of, preferably parallel to, the longitudinal axis  33  of the prop  32  when the prop  32  is in use setting  34  and in which the railing device  28 ,  128  is secured against removal in any directions from the mount  40 ,  140 ,  240  (see  FIGS. 23 to 26 ). 
       FIG. 23  shows a side view of a prop  32 . 1  according to the invention, whose fastening device  138  is shown in longitudinal section and partly with broken lines, whose locking element  145  is in a locking setting  47 , and whereby a railing device  128  according to the invention is laid onto or suspended into the rest element  42  of the mount  140  of the fastening device  128 , at a slant from below and at an angle  163 . 1  to the longitudinal axis  33  of the vertical prop  32 . 1 . 
       FIG. 24  shows a view corresponding to  FIG. 23 , whereby the railing device  128  is now pivoted upward, proceeding from the diagonal setting shown in  FIG. 23 , counterclockwise, into a second diagonal setting, whereby the railing device  128  is still laid onto or suspended into the rest element  42  of the mount  140  of the fastening device  128 , now at an angle  163 . 2  to the longitudinal axis  33  of the prop  32 . 1 . 
       FIG. 25  shows a view corresponding to  FIG. 24 , whereby the railing device  128  is now pivoted upward further, proceeding from the diagonal setting shown in  FIG. 24 , into a third diagonal setting, in which setting a vertical play or a vertical distance between the upper end of the railing element  128  and the locking surfaces  46 . 1 ,  46 . 2  of the locking element  145  that is in its locking position  47  is minimal but still present, and in which the railing device  128  is still laid onto or suspended into the rest element  42  of the mount  140  of the fastening device  128 , now at an angle  163 . 3  to the longitudinal axis  33  of the prop  32 . 1 . 
       FIG. 26  shows a view corresponding to  FIG. 25 , whereby the railing device  128  is now pivoted upward further, proceeding from the diagonal setting shown in  FIG. 25 , counterclockwise, into a horizontal installation setting  49 , in which the railing element  128  and the prop  32 . 1  are disposed at an angle  163 . 4  of about 90 degrees relative to one another. 
     The invention also relates to a method of fastening at least one railing device  28 ,  128  with the help of a fastening device  38  to a prop  32  for scaffolding  20 , a stage, a staircase or like three-dimensional framework, wherein the fastening device  38  comprises a mount  40 ,  140 ,  240  for the railing device  28 ,  128  and wherein the mount  40 ,  140 ,  240  is connected, preferably captively, in particular permanently, for example by welding, with the prop  32 , preferably with a prop  32 .  1  according to the invention, in particular with a vertical post, of metal, which mount  40 ,  140 ,  240  comprises a rest element  42 , which extends in a first direction  41  transversely, preferably perpendicularly, to the longitudinal axis  33  of the prop  32  away therefrom, with a rest surface  43  for vertical support of the railing device  28 ,  128 , which is formed in particular as a single or double railing and preferably with or as a railing rod  28 . 1 ,  28 . 2 ;  128 . 1 ,  128 . 2  and which preferably forms a part of a connecting arrangement, particularly a part of a connecting arrangement  80  according to the invention, wherein a rest part  56 ,  156 , which is preferably arranged in the region of an end  58 . 1 ,  58 . 2  of the railing device  28 ,  128  or of the railing rod  28 . 1 ,  28 . 2 ;  128 . 1 ,  128 . 2 , of the railing device  28 ,  128  can be supported on the rest surface  43  of the rest element  42 , and wherein the fastening device  38  further comprises a locking element  45 ,  145 , which is firmly, preferably captively, connected with the prop  32  and preferably formed with or as a locking lever  70 ,  170 , with a locking surface  46  for mechanically positive locking, preferably free of clamping force, of the railing device  28 ,  128  against vertical removal thereof in upward direction when the prop  32  is in use setting  34 , and wherein the locking element  45 ,  145  is pivotable, preferably manually, in particular in downward direction in use setting  34  of the prop  32 , about a pivot axis  50  from an unlocking setting  48 , in which the railing device  28 ,  128  can be placed on the rest surface  43  of the rest element  42  of the mount  40 ,  140 ,  240  or removed from the mount  40 ,  140 ,  240 , into a locking setting  47 , and conversely, in which the railing device  28 ,  128  is locked by means of the locking element  45 ,  145  against removal from the mount  40 ,  140 ,  240  at least in one direction and in which the railing device  28 ,  128  is secured against removal in any directions from the mount  40 ,  140 ,  240 , wherein the railing device  28 ,  128 , which rests on the rest surface  43  of the rest element  42  of the mount  40 ,  140 ,  240  in use setting  34  of the prop  32 ;  32 . 1 ,  32 . 3 , is removed from the mount  40 ,  140 ,  240  after pivotation of the locking element  45 ,  145  into an or the unlocking setting  48 , without previous removal of the railing device  28 ,  128  in the first direction  41  from the rest element  42 , in a second direction  55  transversely, preferably perpendicularly, to the longitudinal axis  33  of the prop  32  and also transversely, preferably perpendicularly, to the first direction  41 , preferably after prior vertical lifting-off, in a given case carried out within the limits predetermined by the mount  40 ,  140  and especially only lightly or slightly, from the rest surface  43  of the rest element  42  in upward direction. 
     For demounting of the railing devices  28  in the normal case the locking levers  70 ,  170  are to be opened. The railing devices  28 ,  128  can then be demounted by lifting upwardly and subsequently by a lateral displacement relative to the mounts  40 ,  140 ,  240  of the adjacent props  32 . 1 ,  32 . 3 ;  32 . 1 ,  32 . 3 . However, it is also possible, similarly to the case of the afore-described mounting of the advance railing, to proceed only in reverse sequence. Then, for this purpose in a given case only one of the locking levers  70 ,  170  of two adjacent props  32 . 1 ,  32 . 1  has to be opened and the other locking lever  70 ,  170  can remain closed, wherein after a downward pivotation of the railing device  28 ,  128  or of the railing rod  28 . 1 ,  28 . 2 ;  128 . 1 ,  128 . 2 , this can then be removed from being hung in the mount  40 ,  140 ,  240 , with the closed locking lever  70 ,  170 . 
     The preceding description applies in the same manner to the props  32 . 3  which are provided in the uppermost scaffolding tier or storey  22 . 4  of the first scaffolding bay  23 . 1  and which are here plugged onto the props  32 . 1  of the standing scaffolding frame  21 . These props  32 . 3  can, as shown in  FIG. 1 , have a shorter length than, preferably a length approximately half as large as, the props  32 . 1 . However, it will be obvious that the props of the uppermost scaffolding tier or storey  22 . 4  can also have a different, particularly a greater, length, preferably a length corresponding with the length of the props  32 . 1 . It will further be obvious that, for constructing a scaffolding, use can also be made of only or additional separate props  32 . 1 ,  32 . 3  according to the invention and/or of vertical frame elements  105  formed from or by at least one prop  32 . 1 ,  32 . 3  according to the invention and at least one transverse arm  35 . 
     The method illustrated in  FIGS. 23 to 26 , for installation or fastening of a railing device  128 , in order to implement a leading railing, will be explained in another exemplary embodiment using  FIGS. 27 to 30 , in which H-shaped standing frames  21 . 3  are used. 
     One of these scaffolding standing frames  21 . 3  according to the invention is shown in an enlarged representation in  FIG. 31 . This standing frame  21 . 3  differs from the standing frame  21 . 1  shown in  FIG. 2  in that now, the two apertured discs  30  and the transverse arm  35 . 1  welded to them are not disposed in the region of the upper ends of the props, but rather in a center region, so that instead of a U-shaped standing frame  21 . 1  according to  FIG. 2 , now an H-shaped standing frame  21 . 3  is formed. For the remainder, the scaffolding standing frame  21 . 3  differs from the scaffolding standing frame  21 . 1  shown in  FIG. 2  only in that not just one prop or one post, but rather each prop or each post  32 . 5 ,  32 . 6  has two fastening devices that are configured with mounts  140  and locking elements  145 , as they are shown in  FIG. 15  and in  FIGS. 11 to 18 . For the remainder, the scaffolding standing frames  21 . 3  shown in  FIGS. 27 to 31  are configured the same as the scaffolding standing frames  21 . 1  according to  FIG. 2 . However, it is understood that according to the invention, 
     H standing frames can also be used, in which only one prop or one post of the two props or posts is provided with at least one fastening device according to the invention, preferably with two fastening devices according to the invention. 
     In order to set up the scaffolding  20  shown in  FIGS. 27 to 30 , one can proceed as follows: 
     First, in a manner similar to what was described above in connection with  FIG. 1 , a first story or scaffolding tier  22 . 1  can be set up, whereby in contrast to  FIG. 1 , individual props  32 . 5  are set onto the starting members  27 , as the lowermost vertical props or posts. The length of these props or posts  32 . 5 , which can also be rigidly connected with at least one transverse arm, is only about half as great as the length of the props or posts  32 . 1 ,  32 . 2 ,  32 . 4 . 
     As illustrated in  FIG. 27 , in order to set up a second scaffolding tier or story, first an H-shaped scaffolding standing frame  21 . 3  is set onto two of the lowermost vertical posts  32 . 5 . In this connection, as shown, the locking elements  145  of the fastening devices  138  can be in their locking setting  47 . In similar or the same manner as already illustrated in  FIG. 23 , an installer  132  can now suspend a railing device  128  into the uppermost mount  140  of a prop  32 . 6  of the props  32 . 6 ,  32 . 7  of the H-shaped standing frame  21 . 3 , whereby, as mentioned, according to the invention the related locking element  145  can be or is in its locking setting  47 , in other words the locking lever can be or is closed. 
     Subsequently, an operator or installer  132  can suspend the said railing device  128 , which is suspended into the uppermost mount  140  of the fastening device  138  of the first prop  32 . 6  of the first standing frame  21 . 3  into the uppermost mount  140  of a second prop  32 . 6  of a second scaffolding standing frame  21 . 3  that is horizontally spaced apart from the first. For this purpose, it is practical, for simplified assembly, if the locking element  145  of the fastening device  138  of the second standing frame  21 . 3  is in its unlocking setting or open setting (not shown in  FIG. 27 ). Before moving the second standing frame  21 . 3  upward, together with the railing device  128 , it is practical if the installer  132  brings the locking element  145  of this second scaffolding standing frame  21 . 3  into its locking setting  47 , and thereby locks the railing device  128 , which has been suspended with its other or right end, in place there, as well. 
     However, it is understood that during or for suspension of the railing device  128  onto the mount  140  of the second standing frame  21 . 3 , the locking element  145  assigned to this mount  140  can already be or have been changed to its locking setting. 
     However, it is also possible to leave the locking element  145  of the second standing frame  21 . 3  in its open or unlocked setting when moving the second standing frame  21 . 3  upward, together with the railing device  128 , and to only lock the locking element  145  of the mount  140  of the second standing frame  21 . 3  once the railing device  128  is in its horizontal installation setting  49 . 
     Proceeding from the intermediate setting shown in  FIG. 27 , the installer  132  can guide the second scaffolding standing frame  21 . 3 , together with the railing device  128  fastened to it on its uppermost mount  140  of its prop  32 . 6 , upward beyond the top ends of the adjacent “free” vertical props  32 . 5 , so that in this connection, the railing device  128  suspended on the uppermost mount  140  of the prop  32 . 6  of the first scaffolding standing frame  21 . 3  is pivoted upward, counterclockwise (see also  FIGS. 23 to 26 ). 
     After the second standing frame  21 . 3  has been set onto the props  32 . 5 , the railing device  128  suspended on the second standing frame  21 . 3  and on the first standing frame  21 . 3  is in a horizontal installation setting  49 . In this installation setting  49 , the railing device  128  is locked in place with shape fit, preferably without clamping force, by means of the locking element  145  of the first prop  32 . 6  of the first standing frame  21 . 3 , which is already in its locking setting  47 , to prevent removal from its mount  140 , in the use setting  34  of the first prop  32 . 6  of the first standing frame  21 . 3 , upward, in the direction of the longitudinal axis  33  of the first prop  32 . 6 , and in this installation setting  49 , the railing device  128  lies on the rest surfaces  43  of the rest elements  42  of the mounts  140  of the props  32 . 6  of the two standing frames  21 . 3  with its rest surfaces  195 , and is locked in place, by means of the two locking elements  145  of the fastening devices  138  of the props  32 . 6  of the two standing frames  21 . 3 , which are in their locking setting  47 , in such a manner that the railing device  128  is secured to prevent removal in any direction from the mounts  140  of the props  32 . 6  of the two adjacent standing frames  21 . 3 . 
     Subsequently, as shown in  FIG. 28 , covering units or scaffolding floors  31 . 1 , which define or delimit the second scaffolding tier or story  22 . 2 , can be laid onto or suspended into the transverse arm or transverse railing  35 . 1  of the two adjacent scaffolding standing frames  21 . 3 . 
     Proceeding from this, the scaffolding  20  can be built up further, in the same manner as described above and as is evident from the sequence according to  FIGS. 28 to 30 . In this connection, as shown in  FIG. 30 , at least one of the covering units or at least one of the scaffolding floors of the second scaffolding tier or story  22 . 2  can be installed in the form of a pass-through scaffolding floor or a pass-through covering unit  31 . 2 , which allows a person, particularly an installer  132 , to pass through a pass-through opening  131  from a first scaffolding tier or story  22 . 1  to the second scaffolding tier or story  22 . 2 , and vice versa. For this purpose, a ladder  130  can be provided. It is practical if the pass-through scaffolding floor  31 . 2  has a lid (not shown in the figures), preferably attached by means of a hinge. The lid can be moved from an open setting that allows passage to a closed setting, in which it is assured that a person located on the second scaffolding tier or story  22 . 2  cannot fall down through the pass-through opening  131  of the pass-through covering unit or through the pass-through scaffolding floor  31 . 2 . 
     Proceeding from the scaffolding  20  set up in  FIG. 30 , other scaffolding tiers or stories can be set up, in an upward direction, specifically in accordance with the set-up sequence shown in  FIGS. 27 to 30  and described above. 
     For disassembly of the scaffolding  20 , the steps can be carried out in the reverse sequence. 
     REFERENCE NUMERAL LIST 
     
         
           20  scaffolding 
           21  standing scaffolding frame 
           21 . 1  standing scaffolding frame 
           21 . 2  standing scaffolding frame 
           21 . 3  standing scaffolding frame/H-standing frame 
           22 . 1  scaffolding tier/storey 
           22 . 2  scaffolding tier/storey 
           22 . 3  scaffolding tier/storey 
           22 . 4  scaffolding tier/storey 
           23 . 1  first scaffolding bay 
           23 . 2  second scaffolding bay 
           24  rod element/longitudinal railing 
           25  rod element/transverse railing 
           26  diagonal element 
           27  starting member 
           28  railing device/means safeguarding against falling down 
           28 . 1  railing rod 
           28 . 2  railing rod 
           28 . 3  side railing 
           28 . 4  railing bar 
           29  connecting junction 
           29 ′ connecting junction 
           29 ″ connecting junction 
           30  apertured disc 
           31  covering unit/scaffolding floor 
           31 . 1  covering unit/scaffolding floor 
           31 . 2  covering unit/scaffolding floor/pass-through scaffolding floor 
           32  prop/post 
           32 . 1  prop/post 
           32 . 2  prop/post 
           32 . 3  prop/post 
           32 . 4  prop/post 
           32 . 5  prop/post 
           33  longitudinal axis of  32   
           34  use setting 
           35  transverse arm/transverse railing 
           35 . 1  transverse arm/ 0 -transverse railing/round tube 
           35 . 2  transverse arm/U-transverse railing/U-profile tube 
           36 . 1  upper end of  32 . 1   
           36 . 2  upper end of  32 . 2   
           37 . 1  lower end of  32 . 1   
           37 . 2  lower end of  32 . 2   
           38  fastening device 
           39  toe board 
           40  mount 
           41  first direction 
           42  rest element 
           43  rest surface 
           44  support element 
           45  locking element 
           46  locking surface 
           46 . 1  locking surface 
           46 . 2  locking surface 
           47  locking setting 
           48  unlocking setting/open setting 
           49  installation setting/use setting 
           50  pivot axis 
           51  spacing 
           52  spacing 
           53  spacing 
           54 . 1  tube connector of  32 . 1   
           54 . 2  tube connector of  32 . 2   
           55  second direction 
           56  rest part 
           57  passage opening 
           58 . 1  first end 
           58 . 2  second end 
           59  transverse spacing/width 
           60  actuating part of  70   
           61  opening edge 
           62  articulation and locking part of  70   
           63  receiving slot 
           64  direction 
           65  stirrup 
           66  fastening means/rivet 
           67  height 
           68  height 
           69  height/width 
           70  locking lever 
           71  longitudinal slot 
           72  pressing body 
           73  counter-body 
           74  web 
           75 . 1  connecting head 
           75 . 2  connecting head 
           76  eccentric body 
           77  pin 
           78  longitudinal axis of  77   
           79  detent recess 
           80  connecting arrangement 
           81  transverse opening 
           82  width of  56   
           83  longitudinal axis 
           84  opening force 
           85  slot 
           86  first recess 
           87  first wall part 
           88  lug 
           89  second wall part 
           90  surface of  87   
           91  concave rounding 
           93  length of  86   
           94  second recess 
           95  rest surface 
           96  rest surface 
           97 . 1  support surface 
           97 . 2  support surface 
           98  support surface spacing 
           99  width of  42   
           100  spacing 
           101  free end 
           102  greatest spacing 
           103  depth of  94   
           104  depth of  86   
           105 . 1  vertical frame element 
           105 . 2  vertical frame element 
           128  railing device/railing rod 
           128 . 1  railing rod 
           128 . 2  railing rod 
           130  ladder 
           131  pass-through opening of  31 . 2   
           132  operator/installer 
           138  fastening device 
           140  mount 
           145  locking element 
           156  rest part 
           160  actuating part of  170   
           162  articulation and locking part of  170   
           163 . 1  angle 
           163 . 2  angle 
           163 . 3  angle 
           163 . 4  angle 
           165  stirrup 
           166  fastening means/pin, dowel pin 
           170  locking lever 
           172  pressing body 
           174  web 
           175 . 1  connecting head 
           175 . 2  connecting head 
           186  first recess 
           187  first wall part 
           188  lug 
           189  second wall part 
           190  surface of  187   
           191  concave rounding 
           192  fastening body 
           194  second recess 
           195  rest surface 
           196  rest surface 
           197 . 1  support surface 
           197 . 2  support surface 
           198  support surface spacing 
           203  depth of  194   
           204  depth of  186   
           206  lug 
           207  abutment 
           208 . 1  bearing body of  145   
           208 . 2  bearing body of  145   
           209  abutment body 
           210  recess 
           211 . 1  bore 
           211 . 2  bore 
           240  mount 
           242  receiving profile 
           243  spacing 
           244 . 1  (lower) support element 
           244 . 2  (upper) support element 
           264  slot, gap 
           265  opening angle 
           275  connecting head
The invention relates to a prop ( 32.1, 32.3) for a three-dimensional framework, particularly a scaffold ( 20), comprising a fastening mechanism ( 38) for attaching a railing device ( 28) to the prop ( 32.1, 32.3). The invention also relates to a connecting assembly for a railing device ( 28), comprising at least one prop ( 32.1, 32.3) for a three-dimensional framework, especially a scaffold ( 20), and a railing device ( 28) which can be attached to the prop ( 32.1, 32.3) with the help of a fastening mechanism ( 38). Also disclosed is a method for attaching a railing device ( 28) to a prop ( 32.1, 32.3) for a three-dimensional framework, especially a scaffold ( 20), with the help of a fastening mechanism ( 38). The fastening mechanism ( 38) encompasses a locking element which can be swiveled about a swivel pin. In the locked position, the locking surface of the locking element lies across from a bearing surface ( 43) of a support element that is mounted on the prop ( 32.1, 32.3). Furthermore, in the locked position and in the operational position of the prop ( 32.1, 32.3), the locking surface of the locking element is disposed at a vertical distance above the bearing surface of the support element, and/or in the operational position of the prop ( 32.1, 32.3), the swivel pin is placed at a vertical distance above the locking surface that is in the locking position, preferably also at a vertical distance above the bearing surface of the support element.