STATEMENT OF RELATED APPLICATIONS 
       [0001]    This application is the National Phase of and claims priority on and the benefit of International Application No. PCT/EP2016/001485 having an international filing date of 2 Sep. 2016, which claims priority on and the benefit of German Patent Application No. 102015011446.8 having a filing date of 7 Sep. 2015. 
     
    
     BACKGROUND OF THE INVENTION 
     Technical Field 
       [0002]    The invention relates to a road building machine, more particularly a road paver or a feeder, having a chassis with a preferably driven undercarriage, with at least one supply container assigned to the chassis for receiving road building material, wherein the supply container has two container halves which can be unfolded and folded up relative to one another, and with at least one conveyor for discharging the road building material from the supply container. 
       Prior Art 
       [0003]    Road building machines, more particularly road pavers and feeders, are supplied with road building material by way of example from a truck or other transport means. Road pavers serve to produce road coverings of asphalt or another road building material such as by way of example concrete. Feeders serve to supply the road paver with road building material. Trucks or the like tip the road building material either directly into a supply container or bunker, or into a trough of the road paver or into a supply container of the feeder which then transports the material further on to a road paver, more particularly into a supply container of the road paver. Road pavers for simultaneously producing several layers of a road covering have several supply containers for different road building materials. 
         [0004]    As is known the supply containers have two container halves which can be folded up together and unfolded relative to one another. A conveying member is arranged in an apex area where the two container halves are connected to an undercarriage or chassis, and transports the road building material from the supply container against a production direction of the road building machine to a paving screed or to a further conveying member. 
         [0005]    For transporting the road building machine or for the case where only a very little road building material is still in the supply container it is proposed that the container halves are folded up together. In order to fill or receive the road building material the container halves are unfolded in order to maximize the sump capacity or receptacle space of the supply container. In this situation the container halves protrude widely beyond the external dimensions of the chassis. 
         [0006]    So that the two container halves can be folded up together the side walls of the container halves facing the chassis normally have slopes or recesses which correspond with one another and which are designed so that as they fold up the two side walls of the container halves do not collide with one another which would stop their movement. The drawback with this configuration of the side walls is that when filling the supply container with road building material the latter can fall out from the supply container over the side walls or slopes facing the chassis. The road building material which has fallen out then falls onto the already produced road covering and hardens. The falling road building material can furthermore fall onto the substrate which has not yet been finished and impedes the further production process. Furthermore the falling road building material can block or even destroy sensor elements or other mechanisms. 
       BRIEF SUMMARY OF THE INVENTION 
       [0007]    The object of the invention is therefore to provide a road building machine, more particularly a road paver or feeder, in which when loading the supply container the danger of the road building material falling out from the supply container is avoided. 
         [0008]    A road building machine, more particularly a road paver or feeder for achieving this object is a road building machine, more particularly a road paver or feeder, having a chassis with a preferably driven undercarriage, with at least one supply container assigned to the chassis for receiving road building material, wherein the supply container has two container halves which can be unfolded and folded up relative to one another, and with at least one conveyor for discharging the road building material from the supply container, characterized in that the container halves each have at least one shield which can be moved away as the container halves are folded up. According to this it is proposed that the container halves each have at least one shield which can be moved away as the container halves are folded up. The shields can then be configured as plates or plate-like flaps. The road building material is prevented from falling out from the supply container by the shields according to the invention. 
         [0009]    The shields are preferably each arranged on a side wall facing the chassis, more particularly an outside surface of the side wall, of the container halves. The shields are thus arranged between the chassis and the side walls of the container halves. The sump capacity of the storage container is not reduced by this arrangement of the shields outside of the receptacle space of the container halves. 
         [0010]    With an advantageous configuration of the road building machine it is proposed according to the invention that the shields are connected to the container halves so as to be freely movable, preferably transversely to the production direction of the road building machine. Thus the shields have just one degree of freedom transversely to the conveying direction of the road building material. Whereas the freedom of movement of the shields parallel to the conveying direction of the road building material is strictly limited or not provided. 
         [0011]    More particularly it can be proposed that as the container halves are unfolded the shields are movable in areas projecting beyond the side walls of the container halves and/or as the container halves are folded up the shields can be moved out from this area. Thus as the container halves are unfolded the shields are pivoted, pushed, pressed or the like, straight into the recesses or into the freely exposed area of the side walls. Whereas when the container halves are folded up just this section or recess of the side walls of the container halves becomes free again for collision-free folding. This movement takes place purely by gravity, that is, that no further drives are required. The shields follow their movement through gravity, conditioned by their weight. This is particularly advantageous since no further drives, actuators or the like are required. It is however also conceivable that the shields can be moved by a mechanical, electrical, hydraulic or similar drive. 
         [0012]    According to the invention it is proposed that the shields are suspended from the container halves on the side walls, more particularly by a corner area, swinging about an axis. The shields are preferably formed as triangles, but can however also have any other rectangular or polygonal shape. Since the shields are suspended freely rotatable by a corner area on the outer face of the side wall, as the container halves are folded up and unfolded the shield rotates about the axis of rotation, namely first so that the centre of gravity of the shield is always located underneath the axis of rotation. 
         [0013]    Furthermore it can preferably be proposed that at least two bolts, more particularly two static bolts, are arranged on the chassis, more particularly on a chassis wall, wherein each shield is assigned at least one bolt on the chassis wall. The bolts can also be pin-like or a different type of projection. The bolts can be correspondingly attached to the chassis depending on the requirements and external conditions. The bolts are attached each time fixedly to the chassis and do not move when the container halves are being unfolded or folded up. The bolts preferably have a rounded area which interacts with the side edges of the shields. More particularly the invention can propose that the bolts are arranged on the chassis so that at least when the container halves are being unfolded the shields move into contact with the bolt, and the shields can be moved by the bolts from a suspended position into a position resting on the bolts. As the container halves are unfolded a side edge of the shield moves into contact with the bolt. Since the shield is connected to the container half via the axis of rotation and continues to rotate about the axis through the movement of the container halves, the shield is drawn over the bolt. Since a corner area of the shield is connected rotatably to the container half, the shield moves from the practically vertical basic position into a rather horizontal position or end position. The shield is thus held by the axis of rotation and the bolt. Through this “drawing of the shield over the bolt” the shield is moved into the previously free recess of the side face of the container half. During unfolding, the shield is thus moved by the bolt out from a suspended counterpoised position. This movement is also conditioned solely by gravitational force, for which no further drives are required. 
         [0014]    At least one stop is preferably mounted on the side walls, more particularly on the outside faces of the side walls of the container halves. These stops enter into contact with a side edge of the shields as the container halves are folded up together and thus force the shield over the counterpoised position in the direction of the other shield. The shields of the two container halves are moved by the stops practically so far up to one another that they touch. When the container halves are folded up the side edges of the shields first slip over the bolts until the contact is completely eliminated. 
         [0015]    A further preferred exemplary embodiment of a road building machine can propose that a further stop is arranged on the chassis or on a chassis wall and in the folded-up position of the container halves serves as a spacer between the shields, more particularly restricts the pendulum movement of the shields. A gap thereby forms between the two side edges of the shields which have moved up to one another which prevents these from sticking together, as a result of the road building material which has remained adhering to the chassis wall. 
         [0016]    According to a further advantageous configuration possibility for the road building machine it is proposed that the shields have on at least one side edge a border which is configured so that when the container halves are unfolded and folded up the edges of the border form a common plane with the edges of the shields which are arranged on the container halves. The container halves are each assigned at least one rail which is displaceable in elongated holes in order to produce a contact with the chassis wall. This serves on the one hand for sealing so that no road covering accidentally falls out from the supply container, but also on the other hand as a stripping aid so that no road building material settles on the chassis. The borders of the shields are now dimensioned and arranged precisely so that they correspond with these rails of the container halves and form a common sealing edge or stripping edge. This common edge also exists as the container halves are unfolded or folded up. The borders and the rails thus always form a common sealing or stripping edge irrespective of the pivoting angle of the shields. Thus at each moment in time it is ensured that no road building material leaves the supply container unplanned and road building material is scraped away from the chassis. 
         [0017]    It is accordingly proposed according to the invention that the shields are arranged along the side walls of the container halves, more particularly the border of the shields, relative to the rails of the container halves so that as the container halves are unfolded and folded up no interspaces are formed between the shields and the side walls as well as between the borders, the rails and the chassis. 
         [0018]    A road building machine, more particularly a road paver or feeder for achieving the object mentioned at the beginning is a road building machine, more particularly a road paver or feeder, having a chassis with a preferably driven undercarriage, with at least one supply container assigned to the chassis for receiving road building material, wherein the supply container has two container halves which can be unfolded and folded up relative to one another, and with at least one conveyor for discharging the road building material from the supply container, characterized in that at least two shields are mounted rotatably on a chassis wall facing the supply container, wherein at least one of the shields is assigned to each container half. According to this it is proposed that at least two shields are mounted for rotation on a chassis wall of the road building machine facing the supply container, wherein the container halves are each assigned at least one of the shields. The shields can then be configured as plates or plate-like flaps. Through the shields according to the invention the road building material is prevented from falling out from the supply container. 
         [0019]    Furthermore it can preferably be proposed that the shields are suspended freely movable on the chassis wall transversely to a production direction of the road building machine to swing about an axis wherein when the container halves are unfolded the shields can be moved from a first position into a second positon relative to the side walls of the supply container. The shields are arranged between the chassis and the side walls of the container halves. The sump capacity of the supply container is not reduced through this arrangement of the shields outside of the receptacle space of the container halves. The shields have just one degree of freedom transversely to the conveying direction of the road building material. Whereas the freedom of movement of the shields parallel to the conveying direction of the road building material is strictly limited or not provided at all. The shields are preferably configured as triangles but can also have however any other rectangular or polygonal form. Since the shields are suspended freely rotating by a corner area on the chassis wall the shield is rotated about the axis of rotation as the container halves are folded up or unfolded, namely preferably initially so that the centre of gravity of the shield is always located underneath the axis of rotation. 
         [0020]    More particularly the invention can further propose that at least two bolts, more particularly two static bolts are arranged on the container halves or on the side walls of the container halves, wherein each shield is assigned at least one bolt wherein the bolts are arranged on the side walls so that the shields move into contact with the bolts at least when the container halves are being unfolded, and the shields can be moved by the bolts from a first position into a second position. The bolts can be pin-like or a different type of projections. The bolts can be fastened correspondingly on the chassis depending on the requirements and external conditions. The bolts are fixed firmly on the chassis at any moment in time and do not move as the container halves are unfolded or folded up. The bolts preferably have a rounded area which interacts with the side edges of the shields. More particularly the invention can propose that the bolts are arranged on the chassis so that the shields enter into contact with the bolt at least when the container halves are unfolding and the shields can be moved by the bolts out from a suspended position into a position resting on the bolts. As the container halves are unfolding a side edge of the shield moves into contact with the bolts. Since the shield is connected to the chassis wall via the axis of rotation and continues to rotate about the axis through the movement of the container half, the shield is drawn over the bolt. Since a corner area of the shield is connected rotatably to the chassis wall the shield is moved from a basic position into an end position. The shield is thus held by the axis of rotation and the bolt. Through this “drawing the shield over the bolt”, the shield is preferably moved into the previously free recess of the side face of the container half. This movement of the shields is conditioned solely by the force of gravity so that no further drives are required. 
         [0021]    A further exemplary embodiment may propose that at least one stop is arranged on the chassis or chassis wall and in the folded-up state of the container halves serves as the spacer between the shields, more particularly restricts the pendulum movement of the shields. A gap is thereby formed between the two side edges of the shields which have been moved up to one another, whereby it is prevented that these stick together, as a result of road building material which has remained adhering to the chassis wall. 
         [0022]    A particularly advantageous further development of the invention can propose that the shields have on at least one side edge a border which is configured so that as the container halves are unfolded and folded up the edges of the borders lie in a common plane with the edges of the rails which are arranged on the container halves, preferably that the shields are arranged along the side walls of the container halves, more particularly the borders of the shields, relative to the rails of the container halves, so that as the container halves are unfolded and folded up no interspaces are formed between the shields and the side walls as well as between the borders, the rails and the chassis wall. The container halves are each assigned at least one rail which are displaceable in elongated holes in order to produce a contact with the chassis wall. This serves on the one hand as a seal, so that no road covering falls accidentally out of the supply container, but also as a stripping aid, that no road building material settles on the chassis. The borders of the shields are now dimensioned and arranged precisely so that they correspond with these rails of the container halves and form a common sealing edge or scraping edge. This common edge also exists when unfolding or folding up the container halves. The borders and the rails thus always form a common sealing or sealed edge irrespective of the pivoting angle of the shields. Thus it is ensured at each moment in time that no road building material leaves the supply container unplanned and road building material is scraped away from the chassis. 
         [0023]    It is accordingly proposed according to the invention that the shields are arranged along the side walls of the container halves, more particularly the border of the shields, relative to the rails of the container halves so that as the container halves are unfolded and folded up no interspaces are formed between the shields and the side walls as well as between the borders, the rails and the chassis. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0024]    A preferred exemplary embodiment of the invention will now be explained in further detail below with reference to the drawing. In the drawings: 
           [0025]      FIG. 1  shows a side view of a road paver, 
           [0026]      FIG. 2  shows a perspective view of a supply container, 
           [0027]      FIG. 3  shows a perspective rear view of the supply container, 
           [0028]      FIG. 4  shows a perspective view of a side wall of a container half, 
           [0029]      FIG. 5  shows a perspective view of the side wall of the container half, 
           [0030]      FIG. 6  shows a section through a container half in the unfolded position, and 
           [0031]      FIG. 7  shows a section through the supply container in the folded-up position. 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0032]    The present invention is directed to a road building machine, more particularly a road paver  10  or feeder having a chassis ( 25 ) with a preferably driven undercarriage ( 12 ), with at least one supply container ( 14 ) assigned to the chassis ( 25 ) for receiving road building material, wherein the supply container ( 14 ) has two container halves ( 20 ,  21 ) which can be unfolded and folded up relative to one another, and with at least one conveyor ( 24 ) for discharging the road building material from the supply container ( 14 ). Even if a road paver  10  is shown in  FIG. 1 , the subject of the invention, more particularly the subjects of  FIGS. 2 to 7 , can likewise be transferred to a feeder, not shown. Using the illustration of the road paver  10  in  FIG. 1  a description is only provided by way of example as to how the invention is connected to the manufacturing process of a road covering. 
         [0033]    The road paver  10  illustrated in  FIG. 1  serves to produce road coverings. The road paver  10  preferably serves to produce so-called blacktop, namely road coverings of asphalt. The road paver  10  can however also be used to produce road coverings of other materials, such as by way of example concrete. 
         [0034]    The road paver  10  is a self-drive vehicle. For this it has a central drive unit  11  which has by way of example an internal combustion engine which has hydraulic pumps for supplying hydraulic motors and where applicable a generator for producing energy for electrical drives or heaters. 
         [0035]    The road paver  10  furthermore has a drive undercarriage  12  which in the illustrated exemplary embodiment is configured as a caterpillar track mechanism. The road paver  10  can however also be provided with a wheel/roller carriage. The drive undercarriage  12  is driven by the drive unit  11  so that the road paver moves forwards in the production direction  13  to produce the road covering. 
         [0036]    Seen in the production direction  13  a trough-like supply container  14 , also called a bunker, is arranged in front of the drive undercarriage  12 . The supply container  14  holds a supply of the material which serves to produce the road covering. The still hot road building material is transported from the supply container  14  by a conveying unit  24 , formed by way of example as a scraper conveyor, against the production direction  13  to the rear end  15  of the road paver  10 . The rear end  15  of the road paver  10  is located behind the drive undercarriage  12  and the drive unit  11 , seen in the production direction  13 . 
         [0037]    At the rear end  15  of the road paver  10  there is a spreading auger  16  and at a distance behind this a paving screed  17 . The spreading auger  16  and the paving screed  17  are capable of moving up and down. For this purpose the paving screed  17  is suspended from support arms  18 . The support arms  18  are mounted for pivotable movement on the drive undercarriage  12  of the road paver  10 . Hydraulic cylinders or the like pivot the support arms  18  in order to lift and lower the paving screed  17 . 
         [0038]    In order to supply the road paver  10  or supply container  14  with road building material a truck (not shown) backs up against the end  19  of the road paver  10  and pours the road building material into the supply container  14 . So that the sump capacity of the supply container  14  has maximum size, two container halves  20 ,  21  of the supply container  14  are unfolded ( FIG. 2 ). The container halves  20 ,  21  then turn about axes of rotation  22 ,  23  which are arranged above the drive undercarriage  12 . The area between the container halves  20 ,  21  and the axes of rotation  22 ,  23  provides a free view of the conveying unit  24  which is configured by way of example as a scraper conveyor. As already mentioned above, the road building material in the case of a road paver  10  is supplied to the paving screed  17  through this conveying unit  24 . In the event that the supply container  14  is assigned to a feeder, the conveying unit  24  supplies the road building material to a further conveyor or directly into a supply container  14  of a further road building machine. 
         [0039]    Both the drive unit  11 , the drive undercarriage  12 , the support arms  18  and also the supply container  14  are assigned to the vehicle chassis or also chassis  25  of the road paver  10 . 
         [0040]    The container halves  20 ,  21  together enclose a receptacle space  26  for the road building material. The individual container halves  20 ,  21  each have a base  27 ,  28  which is connected both to the axes of rotation  22 ,  23 , and also each to two further side walls. The side walls  29 ,  30  positioned in the production direction  13  at the rear parts of the container halves  20 ,  21  directly border a chassis wall  31 . The side walls  29 ,  30  are configured so that when folding up the receptacle space  26  can be minimized without the side walls  29 ,  30  colliding with one another. 
         [0041]    So that no road building material falls between the side walls  29 ,  30  and the chassis wall  31 , the side walls  29 ,  30  are assigned rails  32 ,  33 . These rails  32 ,  33  can be moved in the production direction  13  so that they form a sealing contact with the chassis wall  31 . The rails  32 ,  33  serve moreover to scrape off road building material which is adhering to the chassis wall  31  as the container halves  20 ,  21  are folded up. 
         [0042]    According to the invention the side walls  29 ,  30  have shields  34 ,  35 . These shields  34 ,  35  can be configured as plate-like flaps or as simple plates. The shields  34 ,  35  illustrated here have a triangular shape but can also have any other polygonal or any geometric shape. 
         [0043]    According to the present invention the shields  34 ,  35  can be mounted both on the side walls  29 ,  30  of the supply container  14  and also on a chassis wall  31  of the chassis  25 . The embodiment is shown below by way of example in which the shields  34 ,  35  are installed on the side walls  29 ,  30 . 
         [0044]      FIG. 3  shows a rear view of the container halves  20 ,  21 , seen in the production direction  13 . It can be seen here that the shields  34 ,  35  are attached to the side walls  29 ,  30  movably, or rotatably about the axes  36 ,  37 . According to the present invention the shields  34 ,  35  shown here are assigned to the side walls  29 ,  30  so that they are freely movable, more particularly swinging about the axes  36 ,  37 . When the container halves  20 ,  21  are in their unfolded position as shown in  FIG. 3 , the shields  34 ,  35  are held in their horizontal position by bolts  38 ,  39  (not shown). In this position the shields  34 ,  35  just cover an otherwise free area between the side walls  29 ,  30  and the chassis wall  31 . The shields  34 ,  35  thus prevent that in the unfolded state of the container halves  20 ,  21  or when receiving road building material this material falls down through the otherwise free opening between the side walls  29 ,  30  and the chassis wall  31 , onto the substratum or the road paver  10 . 
         [0045]    So that the shields  34 ,  35  in the position illustrated in  FIG. 3  form a sealing action relative to the chassis wall  31 , each side edge  40 ,  41 ,  42  of the shield  34  as well as each side edge  43 ,  44 ,  45  of the shield  35  are each assigned a border  46 ,  47 ,  48  and  49 ,  50 ,  51  respectively. The borders  46 ,  47 ,  48 ,  49 ,  50 ,  51  are measured just so that their widths together with the widths of the edges  52 ,  53  of the side walls  29 ,  30  correspond to the widths of the rails  32 ,  33 . The rails  32 ,  33  together with the borders  46 ,  47 ,  48 ,  49 ,  50 ,  51  of the shields  34 ,  35  thus form a sealing edge or a scraper edge in respect of the chassis wall  31  ( FIG. 4 ,  FIG. 5 ). It is however also conceivable according to the invention that the shields  34 ,  35  have only one, two or more than three corresponding borders which undertake a similar function in interaction with the chassis wall  31  as the exemplary embodiment illustrated here. 
         [0046]    Particularly when the container halves  20 ,  21  are being folded up the rails  32 ,  33  and the borders  46 ,  47 ,  48 ,  49 ,  50 ,  51  are moved along the chassis wall  31  and thus clean the chassis wall  31  of any road building material which may be remaining thereon. The road building material is properly scraped away from the rails  32 ,  33  and the borders  46 ,  47 ,  48 ,  49 ,  50 ,  51 . 
         [0047]    In the folded-up state of the container halves  20 ,  21  the receptacle space  26  of the supply container  14  is minimized. This position of the container halves  20 ,  21  is furthermore particularly suitable for transporting the road paver  10  owing to the shorter width of the road paver  10  transversly to the production direction  13 . In this position which is shown in  FIG. 7  the shields  34 ,  35  hang downwards, held by the axes  36 ,  37 . The side edges  40 ,  43  of the shields  34 ,  35  can be aligned parallel to the edges  52 ,  53  of the side walls  29 ,  30 . The borders  46 ,  49  of the shields  34 ,  35  are in this position aligned opposite one another and are only separated from one another by a stop  54  which is arranged centrally on the chassis wall  31 . This stop  54  has the result that the side edges  40 ,  43  of the shields  34 ,  35  do not contact one another and possibly become stuck to one another by residual road building material. 
         [0048]    A stop  57 ,  58  is located on each of the outer faces  55 ,  56  of the side walls  29 ,  30 . These stops  57 ,  58  on the side walls  29 ,  30  of the container halves  20 ,  21  slide the shields  34 ,  35  into their hanging position as the container halves  20 ,  21  are folded up so that the shields  34 ,  35  are fixed in their basic position illustrated in  FIG. 7  by the stops  57 ,  58  and the stop  54 . Thus as the container halves  20 ,  21  fold up the shields  34 ,  35  are only moved by the influence of the stops  57 ,  58  and gravity. It is however also conceivable that the shields  34 ,  35  are moved from their horizontal position into the hanging position—and back again—through drives, such as by way of example mechanical, electrical, hydraulic or other drives. 
         [0049]    As the container halves  20 ,  21  are unfolded the shields  34 ,  35  again follow the effect of gravity and rotate about the axes  36 ,  37 . So that the shields  34 ,  35  pass into the horizontal position illustrated in  FIGS. 1 to 6  in order to avoid the loss of road building material, the chassis wall  31  is assigned the bolts  38 ,  39  already mentioned. During unfolding, the side edges of the shields  34 ,  35  move into contact with the bolts  38 ,  39 . As the container halves  20 ,  21  continue to unfold, the shields  34 ,  35  are drawn over the bolts  38 ,  39  and are thus pushed or pivoted into their horizontal position illustrated by way of example in  FIG. 6 . Also with this movement no additional drives are necessary—but conceivable. 
         [0050]    Thus as the container halves  20 ,  21  unfold, a previously free area between the side walls  29 ,  30  and the chassis wall  31  is closed by the shields  34 ,  35  and as the container halves  21 ,  22  fold up the shields are moved away so that the edges  52 ,  53  of the container halves  20 ,  21  are drawn together. 
       REFERENCE NUMERAL LIST 
       [0000]    
       
           10  Road paver 
           11  Drive unit 
           12  Drive undercarriage 
           13  Production direction 
           14  Supply container 
           15  Rear end 
           16  Spreading auger 
           17  Paving screed 
           18  Support arm 
           19  Front end 
           20  Container half 
           21  Container half 
           22  Axis of rotation 
           23  Axis of rotation 
           24  Conveying unit 
           25  Chassis 
           26  Receptacle space 
           27  Base 
           28  Base 
           29  Side wall 
           30  Side wall 
           31  Chassis wall 
           32  Rail 
           33  Rail 
           34  Shield 
           35  Shield 
           36  Axis 
           37  Axis 
           38  Bolt 
           39  Bolt 
           40  Side edge 
           41  Side edge 
           42  Side edge 
           43  Side edge 
           44  Side edge 
           45  Side edge 
           46  Border 
           47  Border 
           48  Border 
           49  Border 
           50  Border 
           51  Border 
           52  Edge 
           53  Edge 
           54  Stop 
           55  Outside surface 
           56  Outside surface 
           57  Stop 
           58  Stop
A road building machine wherein the danger of material falling out as the supply container is loaded is avoided. For this it is proposed that the container halves each have at least one shield which can be moved away as the container halves are folded up. Road building machines, more particularly road pavers and feeders are supplied with road building material from trucks, and, in order to receive the road building material the road building machines have supply containers with two movable container halves, and, when the supply container is filled, the invention helps prevents road building material from falling out from the supply container.