FIELD OF THE INVENTION 
     The present invention relates to a plug-in type electric interconnecting system and particularly to interconnecting components to be used for a plug-in type electric interconnecting system. 
     The present invention is particularly suited for a high integrated system but may also be applied to a high power system or other corresponding systems. 
     BACKGROUND OF THE INVENTION 
     Electric connector systems including electronic connector systems are used to interconnect electric or electronic systems as well as electric or electronic components. 
     Generally, an electric connector system includes a projection-type connector member such as a conductor beam and a reception-type connector member such as a conductor socket. In such a type of electric interconnecting system, an electric interconnection is achieved by inserting the projection-type connector member into the reception-type connector member. Such an insertion brings the projection-type connector member and the reception-type connector member into contact with each other at their conducting areas, so that an electric signal may be transmitted through those connector members. 
     In a conventional interconnecting system, for example, in the pin grid array shown in FIG. 1 which will be further discussed below, a multitude of individual conductor pins  11  are arranged on a grid structure  12  and a multitude of individual conductor sockets (not shown in FIG. 1) are arranged to receive the individual pins  11 . 
     Here, each pair of the above pin and socket transmits a different electric signal. 
     A high integrated electric interconnecting system may be characterized by a great number of interconnecting contacts within a small area. Naturally, a high integrated electric interconnecting system has shorter signal paths than a low integrated electric interconnecting system and thus occupies a smaller space. 
     The short signal path in a high integrated electric interconnecting system enables a speedy transmission of electric signal. 
     Generally, a high integration of an electric interconnecting system improves performance of the system. 
     A lot of attempts have been made so far to realize high integration of an electric interconnecting system. 
     An example of the electric interconnecting systems so proposed is illustrated in FIG. 2 a . The electric interconnecting system illustrated in FIG. 2 a  is known as the column and box type electric interconnecting system. 
     In the system shown in FIG. 2 a , the projection-type interconnecting member  21  is a conductor beam or conductor column and the reception-type interconnecting member  22  is a conductor socket with a box form. 
     FIG. 2 b  shows the plan view for FIG. 2 a  in which the column is received in the socket. 
     As shown in FIG. 2 b , the socket  22  includes, on its inner walls, the sections  23  and  24  protruding inward for fixing the column within the socket. 
     Another form of electric interconnecting system, which was also proposed, is shown in FIG. 3 a . The electric interconnecting system shown in FIG. 3 a  is known as a single beam interconnecting system. In the system shown in FIG. 3 a , the above-mentioned projection-type interconnecting member is the conductor pin or column  31  and the reception-type interconnecting member is the conductor flexible beam  32 . 
     FIG. 3 b  shows the plan view for FIG. 3 a . The flexible or elastic beam  32  is bent toward the column  31  to maintain the contact with the column  31 . 
     The third type of conventional electric interconnecting system as proposed is shown in FIG. 4 a . The electric interconnecting system shown in FIG. 4 a  is known as an edge connector system. 
     The projection-type interconnecting member of the edge connector system is composed of an insulated printed circuit board  41  and conductor patterns  43  formed on the opposite sides of the printed circuit board. The reception-type interconnecting members of the edge connector system comprise a set of upper conductor fingers and a mating set of under conductor fingers  42  to grip the printed circuit board  41  between the upper and lower sets of fingers. 
     FIG. 4 b  shows an elevation view for FIG. 4 a , in which the printed circuit board  41  is interposed between an upper and lower fingers  42 . When the printed circuit board  41  is interposed between the above-mentioned conductor fingers  42 , the respective conductor patterns  43  come in contact with the corresponding conductor fingers  42 , whereby the electric signals can be transmitted through the conductor patterns  43  and the conductor fingers  42 . 
     The fourth type of conventional electric interconnecting system as proposed is shown in FIG.  5 . The electric interconnecting system shown in FIG. 5 is known as pin and socket interconnecting system. 
     In the system shown in FIG. 5, the above-mentioned projection-type interconnecting member is the conductible stamped pin  51  and the reception-type interconnecting member is the conductible slotted socket  52 . 
     The socket  52  is typically mounted in a through hole formed on a printed circuit board. The pin  51  is larger in size in comparison to the slotted space formed inside the socket  52 . Such a dimension of larger pin is intended to secure the pin  51  in the socket  52  tightly with the aid of elasticity. 
     The interconnecting systems shown in FIGS. 1 to  5  are all defective somehow on various grounds. 
     For example, the interconnecting members of those systems generally include metal platings on the outer surface and inner surface of the projection-type and reception-type member to ensure enough electric contact between the interacting members. Because such a metal plating is typically realized through gold or other expensive metals, the systems shown in FIGS. 1 to  5  can be manufactured only at a high cost. 
     The edge connector system of FIG. 4 has the drawback of its capacity and susceptibility to electromagnetic interference. 
     Similarly, the pin and socket system of FIG. 5 not only requires a big force to insert the pin into the slotted socket but also allows only small tolerance to thereby make adequate fixing difficult. 
     Major problems in connection with the systems shown in FIGS.  2  and  3 (when they are arranged as in FIG.  1 ), the system shown in FIG.  4 (when it is arranged in a row) and the system shown in FIG.  5 (when it is arranged as in FIG. 4 a ), reside in that those systems are not proper for integration which is needed for the technology of future semiconductors and computers. 
     As an attempt to solve such a problem of integration, there was proposed a high integrated interconnecting system by U.S. Pat. No. 5,575,686. 
     The construction for this high integrated interconnecting system is shown in FIGS. 6 a - 6   c . The high integrated interconnecting system of this patent includes a projection-type interconnecting member  61  and a reception-type interconnecting member  62 . 
     The above-described projection-type interconnecting member  61  comprises an insulated substrate  63 , conductor posts  65  and insulated buttresses  67  supporting the conductor posts. The conductor posts  65 , which are arranged around a buttress  67 , are engaged with the conductor beams  64  of the corresponding reception-type interconnecting member  62 . Further, the foot sections  65 A of the conductor posts  65  have a variety of forms depending on the types of interface devices(not shown) to be connected. The conductor posts  65  with the rectangular foot sections  65 A as shown in FIG. 6 a  are well adapted for electric connection of the printed circuit boards positioned at a right angle. 
     In addition, the reception-type interconnecting member  62 , which consists of an insulated substrate  66  and plural conductor beams  64  attached on the insulated substrate  66 , receives the projection-type interconnecting member  61  for transmission of electric signals. 
     The conductor beams  64  of the reception-type interconnecting member  62  has a shape as seen in FIG. 6 b . In particular, the conductor beam  64  largely consists of the contacting part  64 A, the fixed part  64 B and the foot part  64 C. 
     The contacting part  64 A consists of a guiding zone  64 AA for guiding a conductor post  65  and an interface zone  64 AB for forming electric contact with the conducting part of a conductor post, so that the conductor posts of the corresponding projection-type interconnecting member  61  may be received in the contacting parts  64 A. 
     The fixing part  64 B is a part at which the conductor beam  64  is fixed and supported on an insulated substrate  66 . 
     The foot part  64 C by which the conductor beam  64  is bound to an interface device has different shapes depending on the types of interface devices. In other words, the foot parts  64 C shown in FIG. 6 b  may be applicable where two printed circuit boards are connected with other, while the arrangement shown in FIG. 6 c  illustrates foot parts  64 C for the case that the conductor beams  64  of a reception-type member  62  are combined with wires or cables  68 . 
     As described above, in the conventional high integration interconnecting system, each individual manufacture of reception-type interconnecting members  62  and projection-type interconnecting members  61  was needed according to the particular types of devices, for example, a semiconductor chip, a printed circuit board, a wire, a round cable, a flat flexible cable or the like, to which a projection-type interconnecting member  61  and a reception-type interconnecting member  62  are connected. Therefore, a problem was caused in that the manufacture was difficult and the manufacturing cost was conventional. 
     In other words, one disadvantage of that configuration is the reception-type interconnecting member and the projection-type interconnecting member had to be manufactured variedly, depending on whether a board is connected to a board, whether a board is connected to a wire or whether a cable is connected to a cable, in an electric interconnecting system. 
     SUMMARY OF THE INVENTION 
     The present inventors found that the problem associated with the conventional high density electric interconnecting system was caused by the lack of active adaptability to connecting environment due to the integral construction of connecting members, which electrically connect the external devices together. 
     Accordingly, there was perceived a need for an electric interconnecting system, which can be easily adapted for the change of connecting environment without altering the basic configuration of the projection-type interconnecting member and reception-type interconnecting member even in the case of change of a device to be connected. 
     As the result, the present inventors developed a fixed or permanent connecting means having a fixed shape independent of the type of a device to be connected and a intermediate connecting means which can vary in its shape according to the type of another device to be connected so as to mediate between the fixed connecting means and another device. 
     The object of the present invention is to provide an electric interconnecting system which can be adapted easily and actively for the interconnecting environment even if there is a change. 
     Another object of the present invention is to provide an electric interconnecting system which is simple in the manufacture and low in the manufacturing cost. 
     A further object of the present invention is to provide an electric interconnecting system which is easy in the change of design in response to the interconnecting environment. 
     The above objects are achieved by the electric interconnecting system according to the first aspect of the present, invention. The first aspect of the present invention includes a first fixed connecting member having an insulation body and a plurality of projection-type conductor contact groups. The projection-type conductor contact groups are inserted in and fixed on the insulation body and disposed in rows and columns. The first aspect of the present invention also includes a second fixed connecting member having of insulation body and a plurality of reception-type conductor contact groups, the reception-type conductor contact groups being inserted in and fixed on the insulation body and disposed in rows and columns to receive corresponding projection-type conductor contact groups. The first aspect of the present invention also includes an intermediate connecting member interposed between an external device to be connected and said second fixed connecting member to electrically interface the two; wherein the conductor contacts forming the conductor contact groups of said second fixed connecting member include joining portions to extend beyond said insulation body to thereby be electrically connected to said intermediate connecting members. Said external device and another external device are electrically separated and are electrically connectable to each other by causing the projection-type conductor contact groups of the first fixed connecting member to be fixedly received in the reception-type conductor contact groups of the second fixed connecting member and causing the intermediate connecting member to be interposed between the second fixed connecting member and said external device to connect the two. Said intermediate connecting member is variable in its shape to correspond to said external device. 
     The second aspect of the present invention resides in that the electric interconnecting system comprises: a first fixed connecting member consisting of an insulation body and a plurality of projection-type conductor contact groups, the projection-type conductor contact groups being inserted in and fixed on the insulation body and disposed in rows and columns; a second fixed connecting member having an insulation body and a plurality of reception-type conductor contact groups, the reception-type conductor contact groups being inserted in and fixed on the insulation body and disposed in rows and columns to receive corresponding projection-type conductor contact groups; and an intermediate connecting member interposed between an external device to be connected and said first fixed connecting member to electrically interface the two; wherein the conductor contacts forming the conductor contact groups of said first fixed connecting member include joining portions to extend beyond said insulation body to thereby be electrically connected to said intermediate connecting member; said external device and another external device electrically separated are electrically connectable to each other by causing the projection-type conductor contact groups of the first fixed connecting member to be fixedly received in the reception-type conductor contact groups of the second fixed connecting member and causing the intermediate connecting member to be interposed between the first fixed connecting member and said external device to connect the two; and said intermediate connecting member is variable in its shape to correspond to said external device. 
     Third aspect of the present invention also capable of achieving the above object resides in that the electric interconnecting system comprises: a first fixed connecting member consisting of an insulation body and a plurality of projection-type conductor contact groups, the projection-type conductor contact groups being inserted in and fixed on the insulation body and disposed in rows and columns; a second fixed connecting member having an insulation body and a plurality of reception-type conductor contact groups, the reception-type conductor contact groups being inserted in and fixed on the insulation body and disposed in rows and columns to receive corresponding projection-type conductor contact groups; a first intermediate connecting member interposed between an external device to be connected and said first fixed connecting member to electrically interface the two; and a second intermediate connecting member interposed between another external device to be connected and said second fixed connecting member to electrically interface the two; wherein the respective conductor contacts forming the conductor contact groups of said first and second fixed connecting members include joining portions to extend beyond the respective insulation bodies to thereby be electrically connected to said first and second intermediate connecting members; said external device and another external device electrically separated are electrically connectable to each other by causing the projection-type conductor contact groups of the first fixed connecting member to be fixedly received in the reception-type conductor contact groups of the second fixed connecting member and causing the first and second intermediate connecting members to be interposed between the first and second fixed connecting members on one side and said external and another external devices on the other side to thereby electrically combine them; and said first and second intermediate connecting member are each variable in its shape to correspond to said external or another external device. 
     The other objects and advantages of the present invention will be understood from the following description in detail on the embodiments of the invention with reference to the attached drawings. Particularly, the objects and advantages of the invention may be realized through the means and their combinations described in the appended claims. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 shows a plan of a conventional pin grid array, 
     FIG. 2 a  shows a perspective view to illustrate a conventional column type electric interconnecting system, 
     FIG. 2 b  shows the plan of the conventional column type electric interconnecting system depicted in FIG. 2 a,    
     FIG. 3 a  shows a perspective view to illustrate a conventional single beam electric interconnecting system, 
     FIG. 3 b  shows the plan of the conventional single beam electric interconnecting system depicted in FIG. 3 a,    
     FIG. 4 a  shows a perspective view to illustrate a conventional edge connector system, 
     FIG. 4 b  shows the elevation view of the electric interconnecting system depicted in FIG. 4 a,    
     FIG. 5 shows a perspective view to illustrate a conventional pin-and-socket type electric interconnecting system, 
     FIG. 6 a  shows a exploded perspective view to illustrate a conventional high density interconnecting system, 
     FIG. 6 b  shows an enlarged perspective view of an example of conductor beam applicable to the high density interconnecting system depicted in FIG. 6 a,    
     FIG. 6 c  shows an enlarged perspective view of another example of conductor beams applicable to the high density interconnecting system depicted in FIG. 6 a,    
     FIG. 7 shows an exploded perspective view of the electric interconnecting system according to the first embodiment of the present invention, 
     FIG. 8 shows a plan of the first fixed connecting member shown in FIG. 7, as viewed from the direction I, 
     FIG. 9 shows a partial perspective view to illustrate the projection-type conductor contact group depicted in FIG. 8, 
     FIGS. 10 a  to  10   c  each show a perspective view of a conductor post as seen from FIG. 9 to illustrate some variants, 
     FIG. 11 shows a plan of the second fixed connecting member shown in FIG. 7, as viewed from the direction II, 
     FIG. 12 shows the second fixed connecting member in cross section along line IV—IV in FIG. 11, 
     FIG. 13 shows an enlarged perspective view of a flexible beam applicable to the second fixed connecting member as depicted in FIGS. 11 and 12, 
     FIG. 14 a  shows the intermediate connecting member in cross section along line III—III in FIG. 7, 
     FIGS. 14 b  and  14   c  show the intermediate connecting members as depicted in FIG. 7 in cross section according to other embodiments, 
     FIG. 15 shows the cross section of the second fixed connecting member and the intermediate connecting member as depicted in FIG. 7 in their assembled state, 
     FIG. 16 shows the enlarged perspective view of the conductor pin as depicted in FIG. 14 a,    
     FIG. 17 shows the exploded perspective view of the electric interconnecting system according to the second embodiment of the invention, 
     FIG. 18 shows the enlarged perspective view of a conductor post applicable to the first fixed connecting member as depicted in FIG. 17, 
     FIGS. 19 a  to  19   c  each show an enlarged perspective view of a flexible beam applicable to the second fixed connecting member as depicted in FIG. 17, 
     FIG. 20 shows the exploded perspective view of the electric interconnecting system according to the third embodiment of the invention, 
     FIG. 21 shows an enlarged perspective view of a conductor post applicable to the first fixed connecting member as depicted in FIG.  20  and 
     FIG. 22 shows an enlarged perspective view of a flexible beam applicable to the second fixed connecting member as depicted in FIG.  20 . 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     In the following, a few preferred embodiments of the present invention will be described with reference to the attached drawings which constitute a part of the specification and which act to illustrate the principle of the invention. 
     First, the first embodiment of the present invention will be described by referring to FIGS. 7 to  16 . 
     The First Embodiment. 
     FIG. 7 shows the exploded perspective view of the electric interconnecting system according to the first embodiment of the invention. 
     As shown in FIG. 7, this system consists of a fixed connecting member  101  and a intermediate connecting member  150 . The fixed connecting member  101  itself includes the first fixed connecting member  110  and the second fixed connecting member  120 . The intermediate connecting member  150  itself includes a guiding connecting cover  152  and a intermediate connecting member  162 . 
     The intermediate connecting member  150  is positioned between the second fixed connecting member  120  and a device to be connected, including a printed circuit board, wire, semiconductor chip, round cable, flat flexible cable and the like(not shown). 
     Thus, between the devices to be bound, the first fixed connecting member  110 , the second fixed connecting member  120  and the intermediate connecting member  150  are arranged in that order. 
     The second fixed connecting member  120  has a permanently constant construction regardless of the type of the device to be connected. On the other hand, the first fixed connecting member  110  needs to vary in the shape of is connecting area or to be changed according to the type of the device to be connected. 
     Therefore, this embodiment would be useful for the case where an external device to be connected to the first fixed connecting member  110  is fixed or definite and a device to be connected to the second fixed connecting member( 120 ) varies. 
     When the external connecting device which is connected to the first fixed connecting member  110  is a printed circuit board for example and the shape of the intermediate connecting member  150  which is connected to the second fixed connecting member  120  is designed as in FIG. 14 a , a vertical type board-to-board connection is resulted. When the shape of the intermediate connecting member  150  is designed as in FIG. 14 b , there is resulted a horizontal type board-to-board connection. In addition, When the shape of the intermediate connecting member  150  is designed as in FIG. 14 c , there is resulted a board-to-wire connection. 
     As can be understood from the above, the intermediate connecting member  150  may vary freely in its construction according to the type of the external device to be ultimately connected to the second fixed connecting member  120 . 
     Referring to FIGS. 8 to  10 , the first fixed connecting member  110  according to this first embodiment is described. 
     As seen in FIG. 7, the first fixed connecting member  110  includes an insulation body  111  and a plurality of projection-type conductor contact groups  112  which are inserted in and secured on the insulation body. 
     The projection-type contact groups  112  are arranged in a constant row and column so as to maintain enough insulation clearance between the respective contact groups  112 , as seen in FIG.  11 . Therefore, with the help of such an arrangement, a high density electric interconnecting system which can be usefully applied to a high integrated system is realized. 
     FIG. 9 shows a partial perspective view of a projection-type conductor contact group according to the present embodiment. 
     As shown in FIG. 9, a projection-type conductor contact group  112  includes a central insulation buttress  113  positioned in the central part and plural conductor posts  114  positioned around the insulation buttress, with the posts being opposed to each other. 
     The insulation body  111  and insulation buttress  113  act to insulate the conductor posts  114  from one another, so that different electric signals can be transmitted to the respective conductor posts  114 . 
     The insulation buttress  113  with conductor posts  114  are attached to the insulation body  111 . The discrete conductor posts  114  are electrically insulated by the insulation buttress  113  and insulation body  111 . 
     The insulation buttress  113  and insulation body  111  are integrally molded from a single insulating material. Preferably, the insulating material used for the insulation buttress  113  and insulation body  111  is a liquid crystal polymer with an insulating property which exhibits no shrinkage during the molding process. 
     The conductor posts  114  are mounted on the insulation body  111  through the holes formed on the insulation body. 
     As seen from FIG. 9, the insulation buttress  113  comprises an extended part  113 A with a rectangular cross section and a tip part  113 B on the top of the extended part. 
     A projection-type conductor contact group  112  is composed of plural conductor posts  114  attached around an insulation buttress  113 . The conductor posts  114  are so arranged that conductor posts face the other conductor posts in pairs around the central insulation buttress  113 . In the case of insulation buttress with a rectangular cross section, the adjacent conductor posts are offset to each other at a right angle. 
     Each conductor post  114  of a projection-type conductor contact group comprises three parts, that is, the contact part  114 A, stabilizing part  114 B and foot part  114 C. 
     The contact parts  114 A of a conductor post  114  are positioned close to the insulation buttress  113  as seen in FIG.  9 . The stabilizing part  114 B is the part of the conductor post with which the conductor post is fixed to the insulation body  111 . The foot part  114 C is positioned on the opposite side of the contact part  114 A and is extended below the insulation body  111  when mounted. 
     A foot part  114 C may have a variety of shapes as seen in FIGS. 1 a  to  10   c.    
     The conductor post  114  as shown in FIG. 10 a  is intended for the case where the external device to be connected to the first fixed connecting member  110  is a printed circuit board, which is arranged parallel to the first fixed connecting member  110 , and the conductor posts  114  are soldered to the surface of the printing circuit board. 
     The conductor post  114  as shown in FIG. 10 b  is intended for the case where the external device to be connected to the first fixed connecting member  110  is a printed circuit board, which is arranged parallel to the first fixed connecting member  110 , and the conductor posts  114  are fitted in the through holes formed on the surface of the printed circuit board. 
     The conductor post  114  as shown in FIG. 10 c  is suited for the case where the external device to be connected to the first fixed connecting member  110  is a wire or round cable. 
     The stabilizing part  114 B is fixed to the insulation body  111 . This part  114 B acts to prevent the conductor post from twisting or displacement during the handling, connecting and manufacturing process. This stabilizing part  114 B may have such a dimension as to dip the conductor post in the insulation body  111  to maintain a proper insulation spacing between the adjacent conductor posts. 
     In addition, the conductor posts  114  may have various shapes with a cross section of rectangle, triangle, semicircle and the like. 
     In FIG. 7, when the projection-type conductor contact groups  112  of the first fixed connecting member  110  are received in the reception-type conductor contact groups  121  of the second fixed connecting member  120 , the electric signals are transmitted through the contact parts  114 A, stabilizing parts  114 B and foot parts  114 C to the connected device (not shown). 
     The conductor posts  114  are made of beryllium copper, phosphor copper, brass or other copper alloys and plated with tin, gold or palladium or a combination of two or more from tin, gold and palladium. The conductor post may be plated on its entire surface or only on the particular portion which comes in contact with the conductor contact of the reception-type conductor contact group  121 , when a projection-type conductor contact group  112  is received in a reception-type conductor contact group  121 . 
     In the present embodiment, it is assumed that the external device which is connected to the first fixed connecting member  110  is a printed circuit board, which circuit board is arranged parallel to the first fixed connecting member  110 , and the conductor posts  114  are soldered to the surface of the printed circuit board. 
     Next, the second fixed connecting member  120  according to the first embodiment will be described with reference to FIGS. 8 as well as  12  and  13 . 
     The second fixed connecting member  120  according to the first embodiment includes an insulation body  122  and a plurality of reception-type conductor contact groups  121  fixed to the insulation body. The reception-type conductor contact groups  121  each have a plurality of conductor flexible beams  123 . The reception-type conductor groups  121  are so constructed as to receive the projection-type conductor contact groups  112  in the space enclosed by the conductor flexible beams  123 . 
     In other words, the reception-type conductor groups  121  are arranged in such a manner that conductor flexible beams  123  face one another around an arbitrary axis and they are mutually positioned in an offset relation. 
     In FIGS. 11 and 12, four of the conductor flexible beams  123  are positioned so that the beams directly face one another around the central space, and so a beam forms a right angle with its adjacent beams. 
     The insulation body  122  acts to electrically separate the conductor beams  123  so that different electrical signals may be transmitted to respective beams. 
     FIG. 11 is a plan view of the second fixed connecting member  120  shown in FIG. 7, as viewed in the direction of arrow mark II. 
     As seen in FIG. 8, the reception-type conductor groups  121  are arranged in a row and column to receive the projection-type conductor groups  112 . 
     FIG. 12 shows the cross section of the second fixed connecting member depicted in FIG. 11 along the line IV—IV. 
     As seen from FIG. 12, the respective flexible beams  123  are inserted through the holes  124  formed on the insulation body  122  and fixed to the insulation body at an essentially right angle. 
     FIG. 13 shows the enlarged perspective view of a flexible beam  123  depicted in FIGS. 11 and 12. 
     Referring to FIG. 13, each flexible beam  123  includes the contact part  123 A, stabilizing part  123 B and joining part  123 C. 
     The contact part  123 A is a part which comes in contact with a conductor post  114 , when a projection-type conductor contact group  112  is received in a reception-type conductor contact group  121 . In addition, the contact part  123 A consists of an interface portion  123 AA and a lead-in portion  123 AB. 
     The interface portion  123 AA is practically the part which contacts the contact portion  114 A of the projection-type conductor post  114  when a projection-type and reception-type contact groups  112  and  121  are combined with each other. 
     The lead-in portion  123 AB includes a sloped surface  125  which initializes the separation or spread of flexible beams  123  when the insulation buttress of the projection-type conductor contact group  112  starts insertion with its tip portion  113 B for touching the flexible beams(or the projection-type conductor posts  114  themselves start insertion for contacting, if no insulation buttress is used). Therefore, the lead-in portion  123 AB contributes to reduce the force required in inserting the projection-type conductor contact group  112  in the reception-type conductor contact group  121 . 
     The stabilizing portion  123 B is fixed to the insulation body  122 . This part acts to prevent the conductor post from twisting or displacement during the handling, connecting and manufacturing process. This stabilizing part  123 B may have such a dimension as to dip the beam in the insulation body  122  to maintain a proper insulation spacing between the adjacent beams. 
     The joining portion  123 C is an area which is electrically connected to the connection portion  170 A of a intermediate connecting member  150  to be explained later. Preferably, the joining portion  123 C is connected to the connection portion  170 A of a intermediate connecting member  150  through a proper soldering. That is, the joining portion  123 C is an area for joint through soldering. 
     Referring to FIGS. 12 and 13, the flexible beams  123  are bent toward the opposing beams around a definite central space. The figures show the construction before a projection-type conductor contact group  112  is received in a reception-type conductor contact group  121 . 
     On the other hand, when the projection-type conductor contact group  112  is received in the corresponding reception-type conductor contact group  121 , the respective flexible beams  114  forming the reception-type conductor contact group  121  are opened warping backward. 
     The material constituting the insulation body  122  is preferably a liquid crystal molecule as an insulator which exhibits no shrinkage during a molding process. 
     The flexible beams  123  are made of beryllium copper, phosphor copper, bronze or other copper alloys and their contacting portions are plated with tin, gold or palladium. The joining portions  123 C are made of the alloy usable for soldering. 
     Now, the intermediate connecting member  150  for the present embodiment will be described with reference to FIGS. 14 a  to  16 . 
     As can be understood from FIGS. 7 and 14, the intermediate connecting member for the present embodiment includes a intermediate connecting member  162  and a guide cover  152  for covering the conductor pins  170  which are fixedly mounted on the intermediate connecting member  162 . 
     The intermediate connecting member  162  includes an insulation body and a plurality of conductor pins  170  which are fixed to the insulation body by inserting through the holes on the insulation body. The insulation body is provided with a bending support  172  for bending the conductor pins  170  at a right angle. The bending support  172  is formed with the intention to bend the conductor pins  170  uniformly. This bending support  172  is formed in form of steps to meet the situation that the conductor pins  170  have different sites of bending according to their locations. This bending support  172  is formed integrally with the insulation body through molding. 
     The conductor pins  170  are inserted through the holes formed on the insulation body and bent at a right angle at the location of bending support  172 . FIG. 14 a  shows an intermediate connecting member  150  which is useful for the case that two printed circuit board are provided perpendicular to each other. Thus, when two printed circuit boards are provided parallel to each other as in FIG. 14 b  or  14   c , the bending support for bending conductor pins is not needed. 
     The guiding connecting cover  152  serves the purpose of guiding so that the conductor pins  170  may be exactly aligned with the joining portions  123 C of flexible beams  123  in the second fixed connecting member  120 . This guiding connecting cover  152  is provided with guiding holes  153  for aligning the connecting portions  170 A of conductor pins  170  with the joining portions  123 C of flexible beams  123 . 
     The conductor pins  170  which are fixed in the insulation body  163  of the intermediate connecting member  162  have the shape as shown in FIG.  16 . For the sake of convenience, the conductor pins  170  interposed inside the intermediate connecting member  162  as shown in FIG. 14 a  will be taken as the example for explanation. 
     The conductor pin  170  consists broadly of three parts. That is, a conductor pin comprises the connecting portion  170 A, stabilizing portion  170 B and foot portion  170 C. 
     The connecting portion  170 A is designed to be soldered to a joining portion  123 C of a flexible beam in a second fixed connecting member  120  so as to make an electrical connection between a second fixed connecting member  120  and a intermediate connecting member  150 . 
     The stabilizing portion  170 B is the area which is fixed in an insulation body  163  to prevent a connecting portion  170 A from displacement. In such a case as FIG. 14 a , the stabilizing portion  170 B is bent at a right angle at the location of a bending support  172  in form of steps, which bending support is formed inside an insulation body  163 . Therefore, the stabilizing portion  170 B of a conductor pin  170  to be installed in a intermediate connecting member  150  as shown in FIG. 14 a  needs presence of a bending point  170 D. 
     In a conductor pin  170  having the bending point  170 D, one or lower side is designated as the stabilizing portion  170 B and the other or upper side as the connecting portion  170 A. 
     The foot portion  170 C may have various shapes as may be found in FIGS. 14 a  to  14   c  according to the types of the external devices which are connected to the intermediate connecting member  150 . In other words, FIG. 14 a  shows conductor pins or foot portions useful for the case that two printed circuit boards are arranged at a right angle. FIG. 14 b  shows conductor pins or foot portions useful for the case that two printed circuit boards are arranged in a parallel relation. And FIG. 14 c  shows conductor pins or foot portions useful for the case that a printed circuit board and wires or cables are electrically connected. Thus the foot portion  170 C of a conductor pin installed in a intermediate connecting member  150  may vary in its type according to that of a device to be connected. 
     As described above, a intermediate connecting member  150  is installed between a second fixed connecting member  120  and an external device such as a printed circuit board, semiconductor chip, wires, round cables, flat flexible cables or the like to intermediate between the two. 
     The second fixed connecting member  120  can always have an identical construction independent of the types of external devices. Therefore, when the type of external device is changed, it is simply necessary to change the design of the intermediate member  150  which is interposed between the second fixed connecting member  120  and the external device. 
     For example, while in the conventional art, the change in a device to be connected to the second fixed connecting member  120  necessitated the change in the configuration of the second fixed connecting member  120  itself, in the present embodiment, one of the intermediate connecting members  150  as shown in FIGS. 14 a  to  14   c  needs to be chosen, keeping the second fixed connecting member  120  intact. As a matter of course, intermediate connecting members for the present embodiment are not restricted to those configurations as shown in FIG.  14 . 
     Particularly, in the conventional art, in which external devices, particularly two printed circuit boards, are arranged at a right angle, in inserting flexible beams in an insulation body of a second fixed connecting member, it is almost impossible to evenly adjust the foot portions which extended under the insulation body, as the flexible beams should be bent at a right angle and at the same time a layout of flexible beams offset at a right angle should be maintained. 
     However, when the intermediate connecting member  150  as in the present embodiment is used, the flexible beams  123  of the second fixed connecting member  120  would not need any bending operation, whereby the conventional problem of evenness or uniformity with the joining portions of flexible beams is eliminated. The manufacture of a intermediate connecting member  150  is also simple, because arranging conductor pins  170  offset at a right angle is not necessary. 
     Specially, conductor pins  170  can be bent perpendicularly with the aid of the bending support  172  as seen in FIG. 14 a , a uniform and even arrangement of foot portions  170 C in manufacturing is made possible. 
     In the following, the assembling operation of the electrical interconnecting system according to the present embodiment will be described by referring to FIGS. 7 and 15. 
     First, to a external device, for example a printed circuit board, with a surface, there are connected the conductor posts  114  of a first fixed connecting member  110  through the foot portions  114  by soldering. The projection-type conductor contact groups  112  of the first fixed connecting member  110  are caused to be received in the reception-type conductor contact groups  121  of a second fixed connecting member  120 . At this time, the flexible beams  123  of respective reception-type conductor contact groups  121  are opened from other flexible beams springing backward. Then, the flexible beams  123  of the second fixed connecting member  120  are caused, through the joining portions  123 C, to be fitted in the guiding holes  153  on the guiding connecting cover  152  of a properly chosen intermediate connecting member  150  and electrical connections to the conductor pins  170  of the intermediate connecting member  150  are formed through the connecting portions  170 A by soldering. 
     Thereupon, to the foot portions  170 C of the conductor pins  170 , there is connected a external device corresponding to the type of the foot portions  170 C. In such a manner, two or more external devices, electrically separated from one another, can be mutually connected. 
     As can be understood from the above description on the first embodiment, various types of connections such as a vertical type board-to-board connection, a horizontal type board-to-board connection and a board-to-wire connection may be realized by properly choosing a intermediate connecting member  150  without any need to change the shape of a first and/or second fixed connecting member  110  and/or  120 . 
     Next, the electrical interconnecting system according to the second embodiment of the present invention will be described with reference to FIGS. 17 to  19 . The same members as in the first embodiment will be given the identical numbers. 
     The Second Embodiment 
     The second embodiment of the present invention is essentially based on the same principle as the first embodiment. The only difference resides in that a intermediate connecting member  150  is located between a first fixed connecting member  110  and a external device in this embodiment in contrast to the first embodiment where the intermediate connecting member  150  is located between a second fixed connecting member  120  and a external device. 
     Therefore, this second embodiment is essentially the same as the first embodiment with the exception that the location of the intermediate connecting member  150  is changed. 
     Thus, in the following, the description on the same constructions as in the first embodiment is omitted. 
     First, FIG. 17 shows an exploded perspective view of an electric interconnecting system according to the second embodiment of the invention. 
     As seen in FIG. 17, in this embodiment, the intermediate connecting member  150  is located between a first fixed connecting member  110  and an external device. 
     Accordingly, a conductor post  114  of a first fixed connecting member  110  has the shape as shown in FIG.  18 . 
     That is, the conductor post  114  has three portions, i. e. a contact portion  114 A, stabilizing portion  114 B and joining portion  114 F. The contact portion  114 A and stabilizing portion  114 B have the same function and role as the contact portion  114 A and stabilizing portion  114 B of the conductor post  114  in the first embodiment. 
     The joining portion  114 F is the place which is connected through soldering to the connecting portion  170 A of a conductor pin  170  in an intermediate connecting member  150 . 
     Furthermore, the flexible beams  123  of a second fixed connecting member  120  according to the present embodiment have a construction as shown in FIGS. 19 a  to  19   c  according to the type of the relevant external device. As shown in FIG. 19, the flexible beams  123  according to the present embodiment have each a contact portion  123 A, stabilizing portion  123 B and foot portion  123 F, as the conductor beams  114  in the first embodiment. The foot portion  123 F should vary in its shape according to the type of an external device which is connected to the second fixed connecting member  120 , as depicted in FIGS. 19 a  to  19   c.    
     As described above, in the present embodiment, the second fixed connecting member  120  is attached with a device having a surface by way of soldering, with which second fixed connecting member a first fixed connecting member  110  is combined. To the first fixed connecting member  110  is connected an intermediate connecting member  150  which varies in its configuration according to the type of a relevant connecting device. 
     Therefore, in this second embodiment as well, a vertical type board-to-board connection, horizontal type board-to-board connection, board-to-wire connection or other similar connection can be easily carried out by properly changing the intermediate connecting member  120 . 
     Finally, the third embodiment of the present invention will be described with reference to FIGS. 20 to  22 . 
     The Third Embodiment. 
     The third embodiment of the present invention relates to the case of arrangement wherein a first intermediate connecting member  350  is interposed between a first fixed connecting member  310  and an external device while a second intermediate connecting member  450  is interposed between a second fixed connecting member  320  and an external device. 
     Thus, the conductor post  314  and the conductor flexible beam  323  usable for the first and second fixed connecting members  310  and  320  have the shape as shown in FIGS. 21 and 22 respectively. 
     In other words, the conductor post  314  shown in FIG.  21  and the flexible beam  323  shown in FIG. 22 have each a contact portion  314 A or  323 A, stabilizing portion  314 B or  323 B and joining portion  314 F or  323 F. The joining portions  314 F and  323 F are to be connected to the first and second intermediate connecting member  310  and  320  by soldering. 
     The rest of construction for this embodiment is essentially the same as that for the first or second embodiment. 
     As described above, the third embodiment of the present invention permits the unvaried constant shapes of the first and second fixed connecting members  310  and  320  independent of the type of the devices to be connected to those connecting members  310  and  320 . In addition, in this third embodiment as well, a vertical type board-to-board connection, horizontal type board-to-board connection, board-to-wire connection or other similar connection can be easily carried out by properly choosing the shapes of the first and/or second intermediate members  350  and/or  450  which are connected to the first and second fixed connecting members  310  and  320 . 
     As would be evident from the description given above, the electric interconnecting system according to the present invention, in contrast to the conventional art, can be adapted for the varying connecting environment by changing the intermediate connecting member as an exchangeable connecting part in accordance with the type of interface devices and the interfacing arrangement. 
     It is to be understood that, while the invention was described with respect to some specific embodiments, the invention is never restricted to those embodiments and a variety of modifications and alterations would be possible to a man skilled in the art by referring to the description or drawings presented here and within the spirit of the invention and thus those modifications or alterations are to fall within the scope of the invention, which scope should be limited only by the attached claims. 
     As would be clear from the foregoing description, the present invention can cope with the varying connecting environment actively and flexibly by constructing the electric interconnecting system as a discrete form which comprises a fixed part(s) assuming a constant shape(s) irrespective of the type of a device(s) to be connected and an exchangeable part(s) which can be changed in the type according to the type of a device(s) to be connected.
The present invention relates to an plug-in type electric interconnecting system. The electric interconnecting system according to the present invention is characterized in that it comprises a first fixed connecting member consisting of an insulation body and a plurality of projection-type conductor contact groups, the projection-type conductor contact groups being inserted in and fixed on the insulation body and disposed in rows and columns; a second fixed connecting member consisting of insulation body and a plurality of reception-type conductor contact groups, the reception-type conductor contact groups being inserted in and fixed on the insulation body and disposed in rows and columns to receive corresponding projection-type conductor contact groups; and an intermediate connecting member interposed between an external device to be connected and said second fixed connecting member to electrically interface the two; wherein the respective conductor contacts forming the conductor contact groups of said second fixed connecting member include joining portions to extend beyond said insulation body to thereby be electrically connected to said intermediate connecting member; and said intermediate connecting member is variable in its shape to correspond to said external device.