Abstract:
The aim of the invention is to achieve, in the simplest possible manner, a movement of an electric switch ( 3 ) of a medium-high voltage switch panel on a mounting structure ( 1 ) between an interrupt position, a test position and an operating position. To this end, a single mechanical control module ( 9 ) is integrated in the mounting structure ( 1 ). This control module ( 9 ) controls the individual movement sequences while simultaneously transferring the drive forces required therefor.

Description:
CLAIM FOR PRIORITY  
       [0001]    This application claims priority to International Application No. PCT/DE02/03848, which was published in the German language on May 8, 2003, which claims the benefit of priority to German Application No. 101 53 109.5, which was filed in the German language on Oct. 22, 2001. 
     
    
     
       TECHNICAL FIELD OF THE INVENTION  
         [0002]    The invention relates to a mounting structure for an electric switch of an enclosed switch panel, in particular a medium-voltage switch panel, which switch can be made to move between an operating position, a test position and an interrupt position.  
         BACKGROUND OF THE INVENTION  
         [0003]    Such a mounting structure is known for example from the chapter “8.2.4 Metallgekapselte luftisolierte Schaltfelder nach DIN EN 60298 (VDE 0670, Teil 6)” [Metal-enclosed air-insulated switch panels to DIN EN 60298 (VDE 0670, Part 6)] of “ABB-Taschenbuch Schaltanlagen” [ABB pocketbook on switchgear], 10th edition, Cornelsen Verlag Berlin, page 392. Shown there is a metal-clad switch panel which is subdivided into a number of compartments, such as for example a busbar compartment, a cable terminal compartment and a switch compartment. Arranged in the switch compartment is an electric switch. This electric switch can be made to move between an operating position, a test position and an interrupt position. In the interrupt position, the connecting pieces of the electric switch are electrically separated from corresponding counter-contact pieces and the secondary lines are interrupted by means of a plug-in connection. In the test position, the connecting pieces of the switch are separated from the counter-contact pieces. In this position, the secondary lines of the switch and switch panel are connected to one another via the plug-in connection. In the operating position, the connecting pieces of the switch contact the counter-contact pieces.  
           [0004]    By means of the plug-in connection, the secondary lines are connected to one another. The connecting pieces of the electric switch are in this case arranged in such a way that, in the operating position, they protrude through openings provided in a bulkhead into the busbar compartment or the cable terminal compartment. These openings can be closed by means of shutters, in order to ensure a bulkhead effect of the bulkhead even in the case of an electric switch that has been removed or is in the interrupt or test position. The moving of the electric switch on the mounting structure between the operating position, the test position and the interrupt position is performed by complex mechanical devices.  
         SUMMARY OF THE INVENTION  
         [0005]    The invention relates to a mounting structure for an electric switch of an enclosed switch panel, in particular a medium-voltage switch panel, which switch can be made to move between an operating position, a test position and an interrupt position, a plug-in connection being provided for the connection of secondary lines and openings which can be closed by means of shutters being provided in a bulkhead for leading through connecting pieces of the electric switch.  
           [0006]    The invention discloses a mounting structure such that the moving of the electric switch is made possible by a simplified, reliable and low-cost construction.  
           [0007]    According to one embodiment of the invention, there is a single mechanical control module which is integrated in the mounting structure and controls the actuation of the plug-in connection and of the shutters and the moving of the electric switch between the interrupt position, the test position and the operating position.  
           [0008]    The integration of a single control module in the mounting structure makes it possible to restrict the number of components necessary for realizing the movement operation and to restrict the necessary adjustment to a very small amount. Furthermore, the mounting structure with the electric switch arranged on it can be easily removed, for example for maintenance purposes, in its entirety from the switch panel. It is consequently possible to dispense with mechanical couplings between the fixed switch panel and the movable mounting structure. The mounting structure represents a cartridge-like slide-in unit, which can be exchanged without any problem for another mounting structure (if appropriate with an electric switch arranged on it). The control operations concerning the movement of the electric switch on the mounting structure are instigated by the mechanical control module itself. Auxiliary devices, such as additional gear mechanisms, deflecting devices, blocking levers, etc. are no longer necessary in the case of such a construction. On account of the integration in the mounting structure, very simple mechanical constructions can be chosen. Complex lever arrangements for the transfer of forces are avoided.  
           [0009]    Furthermore, it may be advantageously provided that the control module has a continuous first slotted link and a bolt which is guided in it and, during its movement, successively engages with and disengages from various driving devices.  
           [0010]    The use of a continuous first slotted link and a bolt guided in it represents a mechanically extremely robust arrangement. In addition, such slotted links or bolts can be produced in an extremely simple manner. By appropriate shaping of the slotted link, it is easily possible to make various driving devices engage with and disengage from the bolt.  
           [0011]    In addition, it may also be advantageously provided that the driving devices are formed as plates and are guided by means of guiding bolts in elongate holes on the outer sides of the control module.  
           [0012]    If the driving devices are formed as plates, a very low overall height is obtained for these devices. In spite of the low overall height, such driving devices in plate form can transfer very high forces. The guiding of the driving devices on the outer sides of the control module provides the possibility of arranging a multiplicity of such driving devices such that they do not adversely affect one another in the way in which they operate. It is consequently possible to guide the driving devices in a simple way by means of bolts in elongate holes. Furthermore, it is possible to fasten to the driving devices arms for the transfer of movements.  
           [0013]    A further advantageous embodiment provides that the bolt both controls the moving of the electric switch and transfers drive forces for making the electric switch move.  
           [0014]    If the bolt is used both for controlling the moving of the electric switch and for transferring the drive forces necessary for this, it is possible to dispense with additional force transfer elements or control elements. This in turn allows the mechanical structure of the control module to be greatly simplified. In this way, a separation of the control arrangement and drive arrangement, increasing the overall volume, is avoided.  
           [0015]    In addition, it may be advantageously provided that the bolt can be moved by means of a pivotable drive lever essentially parallel to a follower which can be driven on a drive spindle and is connected to the drive lever.  
           [0016]    If the bolt can be moved essentially parallel to a drive spindle, the necessary movement of the movable electric switch between the operating position, the test position and the interrupt position can as a result be achieved in a favorable way. The transfer of the drive force from the drive spindle to the bolt can in this case take place in a suitable way by means of a drive lever. This construction is very robust and suitable for transferring high driving forces. The use of a drive spindle allows a reaction force acting from the switch via the bolt and the drive lever to be automatically inhibited on account of its self-locking effect.  
           [0017]    It may be advantageously provided that spring-loaded pawls which are guided and can be latched in further slotted links are connected to the various driving devices.  
           [0018]    If further slotted links in which spring-loaded pawls are guided are provided, it is possible to allow the release of the various driving devices in a simple way. If the driving devices are unlatched, it is possible to move the driving devices by the bolt. It is therefore provided that, in their end positions, the driving devices are respectively latched with the pawls in the further slotted links, and so an undesired movement or change in position of the driving devices is ruled out.  
           [0019]    Furthermore, it may be advantageously provided that the pawls can be actuated by the bolt itself.  
           [0020]    If the bolt is provided as the actuating device for the pawls, it is possible in an extremely simple way to move the driving devices when the bolt is located in the regions intended for this purpose.  
           [0021]    Furthermore, it may be provided that a common slotted-link plate has the first slotted link for guiding the bolt and the further slotted links.  
           [0022]    If the first slotted link and the further slotted links are arranged in a common slotted-link plate, a change in position of the individual slotted links in relation to one another is no longer possible once this slotted-link plate has been produced. It is consequently ensured that the control of the movement sequence is ensured in a reliable way even after a large number of movement operations. Furthermore, complex adjustment work during assembly is avoided.  
           [0023]    A further advantageous design provides that the drive lever assigned to the bolt is guided between two slotted-link plates arranged at a distance from each other and each of the slotted-link plates respectively has the continuous first slotted link, the bolt being guided in both slotted links.  
           [0024]    If the bolt is guided in two slotted-link plates which are arranged at a distance from each other and respectively have the first slotted link, the transfer of very high drive forces is made possible as a result in a very simple way, since canting of the bolt in a single slotted link is ruled out. The transfer of high drive forces is further supported by the guidance of the drive lever between the two slotted-link plates. At the same time, the bolt is guided by such an arrangement in an automatically securing manner between the slotted-link plates if a fixed connection is provided between the drive lever and the bolt. Additional securing devices such as splints or securing plates are then not required.  
           [0025]    Furthermore, it may be advantageously provided that one of the driving devices is connected to a movable arm for the actuation of the plug-in connection, on which arm a plug-in connector part is mounted in a floating manner.  
           [0026]    If one of the driving devices is assigned a movable arm, the latter can be used in a simple way for moving part of the plug-in connection. Depending on the movement of the driving device, it is then possible to connect a plug-in connector part of the plug-in connection to a corresponding counter piece. The floating mounting of the plug-in connector part makes it possible to compensate for tolerances with regard to the mechanical arrangement of the plug-in connector part and the associated counter piece of the plug-in connection and to relieve the plug-in connection itself of external forces. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0027]    An exemplary embodiment of the invention is to be described in more detail below and shown on the basis of a drawing, in which:  
         [0028]    [0028]FIG. 1 shows a section through a schematically represented switch panel.  
         [0029]    [0029]FIG. 2 shows a schematic perspective view of the mounting structure with an integrated mechanical control module.  
         [0030]    [0030]FIG. 3 shows a plan view of the first side of the control model, facing the switch.  
         [0031]    [0031]FIG. 4 shows a plan view of the second side of the control model, facing away from the switch.  
         [0032]    [0032]FIG. 5 shows a schematic representation of a lever chain for the actuation of the shutters.  
         [0033]    [0033]FIG. 6 shows a view of a slotted-link plate. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0034]    The mounting structure  1 , and the components assigned to it, can be made to move into and out of a switch compartment  6  of an enclosed switch panel  2  (FIG. 1). This moving in and out is used essentially for maintenance purposes or for the exchange of a defective mounting structure  1  or subassemblies arranged on the mounting structure  1 . An electric switch  3  can be made to move in relation to the mounting structure  1  between an operating position, a test position and an interrupt position. The connecting pieces  4   a,b  of the electric switch  3  can be led through openings  5   a,b  in a bulkhead  7  of the switch panel  2 . These openings  5   a,b  are closed in the test position and in the interrupt position of the electric switch  3  by shutters  8   a,b . On one side, the bulkhead  7  is adjacent to the switch compartment  6 . On the other side of the bulkhead  7  there is a busbar compartment  50  and a cable terminal compartment  51 . In the cable terminal compartment  51  and the busbar compartment  50  there are respectively counter-contact pieces  52   a,b.    
         [0035]    With the counter-contact pieces  52   a,b , the connecting contact pieces  4   a,b  can be contacted by making the electric switch  3  move.  
         [0036]    [0036]FIG. 2 shows a perspective view of the mounting structure  1 , without the electric switch  3  assigned to the mounting structure  1  being represented.  
         [0037]    To be described first is the mechanical control module  9 , which is provided for making the electric switch  3  move between the operating position, the test position and the interrupt position, for actuating the shutters  8   a,b , and the actuation of a plug-in connection  10  for the connection of secondary lines. Secondary lines are, for example, measuring lines, control lines or communication lines.  
         [0038]    The mechanical control module  9  has a rectangular first slotted-link plate  11  and an identically formed rectangular second slotted-link plate  12  (FIGS. 3, 4). The first slotted-link plate  11  and the second slotted-link plate  12  are arranged at a distance from each other. Each of the slotted-link plates  11 ,  12  has an identical continuous first slotted link  13   a,b  and a first, a second, a third and a fourth further slotted link  14   a,b ,  15   a,b ,  16   a,b ,  17   a,b . In the first slotted links  13   a,b , a bolt  18  is guided. The drive of the bolt  18  takes place by means of a drive lever  19 , which is arranged between the two slotted-link plates  11 ,  12 . The drive lever  19  is in turn connected to a follower  21  arranged on a rotatably mounted drive spindle  20  (FIG. 2). The drive spindle  20  can be made to rotate by means of a tool. Depending on the direction of rotation of the drive spindle  20 , a movement of the bolt  18  takes place in a first direction or a second direction, opposite to the first direction. Arranged on the side of the mechanical control module  9  facing away from the electric switch  3  is a first driving device  22  (FIG. 4). The first driving device  22  is movably guided by means of guiding bolts in the first  
         [0039]    further slotted link  14   a  of the first slotted-link plate  11 . A second driving device  23  is movably mounted in the second further slotted links  15   a,b  of the first and second slotted-link plates  11 ,  12 , likewise by means of guiding bolts. In the third and fourth further slotted links  16   a,b ,  17   a,b  of the first and second slotted-link plates  11 ,  12 , a third driving device  24  is movably mounted by means of guiding bolts. To achieve a symmetrical distribution of the drive forces, the second driving device  23  has a second part  23   a , which is rigidly connected by means of the guiding bolts and arranged on the side of the mechanical control module  9  facing the switch (FIG. 3). Furthermore, the third driving device  24  has a second part  24   a , which is rigidly connected by means of guiding bolts and arranged on the side of the mechanical control module  9  facing the switch. Arranged at a fixed angle on the second part  23   a  of the second driving device  23  is an essentially T-shaped bar  25 , which effects the movement of the shutters  8   a , 8   b  (FIG. 2, cf. FIG. 5). Formed onto the second part  24   a  of the third driving device  24  is a fastening strap  26 , which has bores and to which the electric switch  3  is fastened and can be made to move with it in relation to the mounting structure  1  between the operating position, the test position and the interrupt position (FIGS. 2, 3). Arranged on the first driving device  22  is a movable arm  27 , which moves a plug-in connector part  10   a . Furthermore, the first driving device  22  has a blocking arm  28 , the function of which is to be described further below. To secure the three driving devices  22 ,  23 ,  24  in the respective end positions and prevent unwanted movement, each of the driving devices is assigned a pawl  22   b ,  23   b ,  24   b  (FIG. 4). On account of the use of a self-locking drive spindle  20  and the construction of the first driving device  22 , there is no need for locking of the first driving device  22  in the interrupt position of the switch  3 . Although the pawls  22   b ,  23   b ,  24   b  are not formed entirely identically in their construction, they are each the same in the way in which they operate. Each of the pawls  22   b ,  23   b ,  24   b  is formed as a lever which can pivot about a guiding bolt. These levers respectively have at their free ends a right-angled bend  22   c ,  23   c ,  24   c  extending into the first slotted-link plate  11  (FIG. 6), which bends respectively protrude into one of the further slotted links  14   b ,  15   b ,  17   b . The pawls  22   b ,  23   b ,  24   b  are respectively spring-loaded and, in the non-actuated state, press the bends  22   c ,  23   c ,  24   c  respectively against an edge of the further slotted links  14   b ,  15   b ,  17   b . Formed in specific regions in the edges of the further slotted links  14   b ,  15   b ,  17   b  are recesses  53 ,  54 ,  55 ,  56 ,  57 , in which the bends  22   c ,  23   c ,  24   c  are able to latch under the spring loading for fixing the respective driving device.  
         [0040]    The operation of making the electric switch  3  move from the interrupt position via the test position into the operating position is to be described below.  
         [0041]    At first, the electric switch  3  is in the interrupt position. In this position, the connecting pieces  4   a,b  are separated from the counter-contact pieces  52   a,b . The plug-in connection  10  for the connection of the secondary lines is separated. The openings  5   a,b  in the bulkhead  7  are closed by shutters  8   a,b . The bolt  18  is in the position represented in FIGS. 3, 4 and  6  (region A, FIG. 6). If the drive spindle  20  is then made to rotate in a first direction, the follower  21  on the drive spindle  20  begins to move in the direction which is designated by the arrows  40 ,  41 ,  42 ,  43  in FIGS. 2, 3,  4 ,  6 , and thereby moves the bolt  18  via the drive lever  19  along the continuous first slotted link  13   a,b  (FIG. 2, FIG. 6). At first, the bolt  18  is in engagement with the first driving device  22  and likewise moves the first driving device  22 . Via the movable arm  27 , the floating plug-in connector part  10   a  is thereby moved in the direction of the arrow  40  (FIG. 2) and enters the counter piece (not represented) that is arranged in a corresponding manner. Until the region B of the continuous first slotted link  13   a,b  is reached, the bolt  18  is constantly in engagement with the first driving device  22 . When the region B is reached, the bolt  18  disengages from the first driving device  22  and allows the first pawl  22   b  to latch into the recess  57  of the first further slotted link  14   b , so that the first driving device  22  is fixed in its position. The electric switch  3  is then in the test position. That is, the contact of the secondary lines is established via the plug-in connection  10 , the electric switch  3  itself is still in the interrupt position, i.e. the connecting pieces  4   a,b  of the electric switch  3  are separated from the counter-contact pieces  52   a,b , and the shutters  8   a,b  are still closed in front of the openings  5   a,b  in the bulkhead  7 . If the bolt  18  is kept moving by means of the drive spindle  20 , it unlatches the second pawl  23   b  of the second driving device  23  and moves the second driving device  23  through the region C of the first slotted link  13   a,b . Via the T-shaped bar  25  (FIG. 2), which is arranged on the part  23   a  of the second driving device  23 , the shutters  8   a,b  are then moved in front of the openings  5   a,b  in the bulkhead  7  and release the opening  5   a,b . This takes place for example via a mechanical lever chain schematically represented in FIG. 5. Toward the end of the portion C, the bolt  18  disengages from the second driving device  23  and latches the second pawl  23   b  in the recess  56  of the second further slotted link  15   b , so that the second driving device  23  is also secured in its momentary position. In the region D, the bolt actuates the third pawl  24   b , which is assigned to the third driving device  24  and unlatches the latter. Subsequently, the electric switch  3 , screwed to the formed-on fastening strap  26 , is made to move by means of the third driving device  24 ,  24   a  along the region E in relation to the mounting structure  1  into the operating position. That is, the connecting pieces  4   a,b  of the electric switch  3  are moved through the now free openings  5   a,b  in the bulkhead  7  and come into electrical contact with the counter-contact pieces  52   a,b  on the other side of the bulkhead  7 . Toward the end of the movement of the electric switch  3 , in the region F of the continuous first slotted link, the third pawl  24   b  latches in the recess  54 , so that this position of the third driving device  24  is also secured. After that, the bolt  18  is moved into a rest position, to ensure secure latching of the third pawl  24   b . In addition to the latching by the third pawl  24   b , unintentional movement of the electric switch  3  in the operating position is prevented on account of the design of the third driving device  24  in interaction with the self-locking drive spindle  20 . The electric switch  3  has then reached its operating position. To make the electric switch  3  move from its operating position into the interrupt position, the drive spindle  20  is then moved in the opposite direction of rotation, and the sequence of the individual movement phases takes place in the reverse order.  
         [0042]    Since the moving of the electric switch  3  from the interrupt position via the test position into the operating position and vice versa takes place under certain boundary conditions, several locking conditions also have to be satisfied.  
         [0043]    One of the main locking conditions is realized in dependence on the position of a handle bar  30  pivotably arranged on the front side of the mounting structure  1  (FIG. 2). In the state in which the mounting structure  1  has been pushed into the switch compartment  6  of the switch panel  2 , the handle bar  30  is arranged such that it is pivoted away. If it is then intended to pull the mounting structure  1 , and the electric switch  3  arranged on the mounting structure  1 , out of the switch compartment  6 , the handle bar  30  is pivoted upward. This pivoting up is only possible, however, if a blocking piece  32 , which can be displaced via a transmission rod  31   a  by means of a slotted-link control, is displaceable from its rest position in the direction of the arrow  44 . This is so because this blocking piece  32  is blocked by the already mentioned blocking arm  28 , which is assigned to the first driving device  22 , as soon as the interrupt position has been left. It is ensured by this locking that on the one hand the handle bar  30  can only be pivoted up when the electric switch  3  is in the interrupt position. On the other hand, the electric switch  3  is made to move out of its interrupt position into the test position and further into the operating position if the handle bar  30  has been pivoted away into its rest position, since otherwise the movement of the blocking arm  28  is prevented by the blocking piece  32 .  
         [0044]    A further locking condition is realized by a pushing element  58  having a ramp. This pushing element  58  is displaceable in dependence on the position of the handle bar  30  parallel to an angle profile  33 . The angle profile  33 , which has a recess  34  with a ramp in one of the profile legs, is fixed in place on the base area of the mounting structure  1 . A control rod (not represented) protrudes into this recess  34 . This control rod, which is not represented and extends perpendicularly in relation to the base area of the mounting structure  1 , is undisplaceable or displaceable in its position in dependence on the switching position of the electric switch  3 . In the switched-on state, the control rod protrudes undisplaceably into the recess  34 , so that the pushing element  57  cannot push the control rod up and away by means of the ramp against the running slope of the recess  34 . The handle bar  30  consequently cannot be pivoted up from its rest position into the operating position. If the electric switch  3  is switched off can the handle bar  30  be pivoted up from its rest position into the operating position. Then the control rod is movable in such a way that it is displaceable by a movement of the handle bar  30  and can be pushed upward by means of the ramp of the pushing element  58 .  
         [0045]    Apart from the locking conditions already described, a further locking condition is provided. The drive spindle has on its front side an appropriate shaping, so that a tool can be placed onto the drive spindle  20  to set it in rotation. Arranged in front of the end face there of the drive spindle  20  is a perforated plate  35 . This perforated plate  35  is displaceable in the direction of the axis of rotation of the drive spindle  20 . This displacement is effected by the operating tool being applied. This perforated plate  35  is connected to a displaceable further angle profile  36 , which is guided parallel to the angle profile  33  described above. The further angle profile  36  has a further recess  37 . The further recess  37  can also be blocked by the control rod described above, in the same way. That is, the perforated plate  35  is displaceable by means of the tool to be fitted on if the control rod protrudes displaceably into the further recess  37 . The fitting on of the operating tool, and consequently the moving of the electric switch  3  between the operating position, the test position and the interrupt position, takes place if the electric switch  3  is in a switched-off state.  
         [0046]    Furthermore, a locking of the mounting structure  1  in the switch compartment  6  of the switch panel  2  is provided in dependence on the pivoting position of the handle bar  30 . With the pivoting up of the handle bar  30  into the operating position, latching bolts  38   a,b  are withdrawn by means of transmission rods  31   a,b . The withdrawal takes place by means of identical slotted-link controls. Once the locking conditions, inquired in parallel, are satisfied can the mounting structure  1 , with the subassemblies arranged on the mounting structure  1 , then be withdrawn and removed from the switch compartment  6  of the switch panel  2 . If the control rod has been displaced upward out of the recess of the angle profile  33  on account of the pivoting movement of the handle bar  30  or the fitting of the tool onto the drive spindle  20 , it is ensured by a mechanism not described in any more detail here that the switching-on operation of the electric switch  3  is prevented.  
       List of Designations  
       [0047]    [0047] 1  mounting structure  
         [0048]    [0048] 2  switch panel  
         [0049]    [0049] 3  switch  
         [0050]    [0050] 4   a,b  connecting pieces  
         [0051]    [0051] 5   a,b  openings  
         [0052]    [0052] 6  switch compartment  
         [0053]    [0053] 7  bulkhead  
         [0054]    [0054] 8   a,b  shutters  
         [0055]    [0055] 8  control module  
         [0056]    [0056] 8   a,b  shutters  
         [0057]    [0057] 9  control module  
         [0058]    [0058] 10  plug-in connection  
         [0059]    [0059] 10   a  plug-in connector part  
         [0060]    [0060] 11  slotted-link plate  
         [0061]    [0061] 12  slotted-link plate  
         [0062]    [0062] 13   a,b  slotted link  
         [0063]    [0063] 14   a,b  slotted link  
         [0064]    [0064] 15   a,b  slotted link  
         [0065]    [0065] 16   a,b  slotted link  
         [0066]    [0066] 17   a,b  slotted link  
         [0067]    [0067] 18  bolt  
         [0068]    [0068] 19  drive lever  
         [0069]    [0069] 20  drive spindle  
         [0070]    [0070] 21  follower  
         [0071]    [0071] 22  driving device  
         [0072]    [0072] 22   b  pawl  
         [0073]    [0073] 22   c  bend  
         [0074]    [0074] 22  driving device  
         [0075]    [0075] 23   a  part  
         [0076]    [0076] 23   b  pawl  
         [0077]    [0077] 23   c  bend  
         [0078]    [0078] 24  driving device  
         [0079]    [0079] 24   a  part  
         [0080]    [0080] 24   b  pawl  
         [0081]    [0081] 24   c  bend  
         [0082]    [0082] 25  T-bar  
         [0083]    [0083] 26  fastening strap  
         [0084]    [0084] 27  arm  
         [0085]    [0085] 28  blocking arm  
         [0086]    [0086] 30  handle bar  
         [0087]    [0087] 31   a,b  transmission rod  
         [0088]    [0088] 32  blocking piece  
         [0089]    [0089] 33  angle profile  
         [0090]    [0090] 34  recess  
         [0091]    [0091] 35  perforated plate  
         [0092]    [0092] 36  angle profile  
         [0093]    [0093] 37  recess  
         [0094]    [0094] 38   a,b  latching bolt  
         [0095]    [0095] 40 , 41  arrows  
         [0096]    [0096] 42 , 43 , 44  arrows  
         [0097]    [0097] 50  busbar compartment  
         [0098]    [0098] 51  cable terminal compartment  
         [0099]    [0099] 52   a,b  counter-contact pieces  
         [0100]    [0100] 54 , 55  recesses  
         [0101]    [0101] 56 , 57  recesses  
         [0102]    [0102] 57  pushing element