Patent Abstract:
A terminal block connecting apparatus includes first and second support members displaceable from a disengaged condition toward an engaged condition in which corresponding main terminal blocks are brought into electrical engagement, characterized by the provision of first and second test terminal blocks connected with the support members for electrical engagement when the first and second support members are in an intermediate condition between the disengaged and engaged conditions. One of the test terminal blocks is supported by a carrier member for movement relative to the associated support member, whereby the test terminal blocks will remain in electrical engagement during displacement of the support members between the test and connected conditions. A friction retaining arrangement serves to resist displacement of the carrier member relative to its associated support member.

Full Description:
BACKGROUND OF THE INVENTION  
       [0001]     1. Field of the Invention  
         [0002]     A terminal block connecting apparatus includes first and second support members displaceable from a disengaged condition toward an engaged condition in which corresponding main terminal blocks are brought into electrical engagement, characterized by the provision of first and second test terminal blocks connected with the support members for electrical engagement when the first and second support members are in an intermediate condition between the disengaged and engaged conditions. Carrier means support one of the test terminal blocks for displacement relative to the associated support member, whereby the test terminal blocks remain in electrical engagement during displacement of the support members between the intermediate test condition and the final connected condition. Friction retaining means serve to resist displacement of the carrier member relative to its associated support member.  
         [0003]     2. Description of Related Art  
         [0004]     It is known in the patented prior art to provide electrical switching and connecting arrangements, such as in the field of emergency power supplies, to connect and disconnect electrical power contacts. In this operation, an additional equipment segment with corresponding power contacts is pushed upon a basic equipment segment with first power contacts. It is known that along with the power contacts, one can connect additional contacts with each other on the equipment segments, which already contact each other in a test position before there is any pushing of the equipment segment into the final engaged position in which the power contacts are also connected with each other. In this way, before reaching the final engaged position, one can already perform tests, for example, to check functions of the equipment segments that are to be connected with each other. In the broadest sense, the invention relates to the area of connecting the additional contacts upon equipment segments that are to be connected with each other by means of suitable switch gears. It is, for example, conceivable that one of the contacts to be connected with each other is fashioned in the form of a sliding contact in which the other contact can be moved out of a first position—the test position—in a sliding manner all the way into the final engaged position (in which the power contacts are connected with each other).  
         [0005]     Such switch gears are known from the state of the art. But their structure is often relatively complicated. Besides, the known designs are not always fully functionally reliable.  
         [0006]     Against this background, the present invention was developed to provide a switch gear that has a simple design and nevertheless a particularly stable structure by means of which, also in case of strong forces to be included in the wiring, one can reliably and easily attain the required test position as well as the final connected position.  
         [0007]     Accordingly, the switch gear has at least one separable locking device for the purpose of locking the switch gear in the first position on the support collar of the electrical appliance, which is so designed that the locked position can be separated only by the shifting of the switch gear by overcoming a friction force between elements of the locking device.  
         [0008]     The switch gear of the present invention has a simple structure and can therefore be made at reasonable cost. The locking device is so structured that, first of all, one attains a clearly recognizable locking position. Either in this position or shortly thereafter, one reaches the test position to perform tests. The engaged or “connect position” can be attained only by further insertion with a stronger insertion force. The switch gear can also absorb very strong forces without any further trouble.  
       SUMMARY OF THE INVENTION  
       [0009]     Accordingly, a primary object of the present invention is to provide a connector arrangement in which a pair of test terminal blocks are initially brought into electrical engagement when a pair of support means are displaced from a disconnected condition toward an intermediate test condition, and a pair of main terminal blocks are brought into electrical engagement when the support means are displaced from the intermediate test position toward the final connected condition, one of the test terminal blocks being supported on a carrier member that is displaceable relative to the associated support means, thereby to maintain the test terminal blocks in engagement as the support means are displaced to effect engagement of the main terminal blocks.  
         [0010]     According to a more specific object of the invention, friction retaining means serve to maintain the carrier member in one of its first and second positions during the assembly and disassembly of the terminal blocks. The friction retaining means includes a pair of parallel locking levers that are pivoted outwardly by a control member into locking engagement with respective locking recesses contained in the associated support member. The control member is axially displaced relative to a guide sleeve as the main support means are displaced toward one of the test and final engaged conditions. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0011]     Other objects and advantages of the invention will become apparent from a study of the following specification, when viewed in the light of the accompanying drawing, in which:  
         [0012]      FIG. 1   a  is a perspective left-hand view, with certain parts broken away, of the terminal block connecting apparatus in the initial disconnect condition, and  FIGS. 1   b  and  1   c  are corresponding right-hand sectional views of the test connector block arrangement and the frictional retaining means, respectively, of the apparatus of  FIG. 1   a;    
         [0013]      FIG. 2   a  is a left-hand perspective view of the apparatus of  FIG. 1   a  when in the intermediate test position, and  FIGS. 2   b  and  2   c  are corresponding right-hand sectional views of the test connector block arrangement and the friction retaining means, respectively, of the apparatus of  FIG. 2   a;    
         [0014]      FIG. 3   a  is a left-hand perspective view of the apparatus of  FIG. 1   a  when in the fully connected condition, and  FIGS. 3   b  and  3   c  are right-hand sectional views of the test connector block arrangement and the friction retaining means, respectively, of the apparatus of  FIG. 3   a;    
         [0015]      FIG. 4  is a right-hand perspective view of the apparatus of  FIG. 2   a;    
         [0016]      FIG. 5  is a right-hand perspective view of the apparatus of  FIG. 3   a;    
         [0017]      FIG. 6  is an exploded bottom perspective view of the carrier means that support the friction retaining means of  FIG. 1   a,  and  FIG. 7  illustrates the apparatus of  FIG. 6  when in the assembled condition;  
         [0018]      FIGS. 8   a - 8   f  are schematic views illustrating the operation of the friction retaining means of  FIG. 6 ;  
         [0019]      FIG. 9   a  is a left hand perspective view of a modification of the apparatus of  FIG. 2   a  when in the test condition; and  
         [0020]      FIG. 10   a  is a detailed perspective view of the friction retaining means of  FIG. 1 , and  FIGS. 10   b  and  10   c  are perspective and side views, respectively, of a modification of the friction retaining means of  FIG. 10   a.   
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0021]     Referring first more particularly to  FIGS. 1   a - 1   c,  the connecting apparatus of the present invention is operable to connect a main terminal block assembly  1  electrically with a corresponding main terminal block assembly  1 ′ as shown in  FIG. 1   b.  The main terminal block assembly  1  includes a plurality of terminal blocks  2  that are supported by a moveable support means  6  for displacement toward a stationary support means  3  that is connected with a standard electrical installation, system or appliance, not shown. The contacts of the two terminal block assemblies  1  and  1 ′ are of the corresponding pin and socket contact type, whereby displacement of the components together is shown by the arrow x in  FIG. 1   c,  effects engagement of the two main block assemblies.  
         [0022]     The terminal block assembly  1  includes a pair of parallel rows of contacts  5   a  and  5   b  that are arranged above the horizontal support plate  6   a.  Arranged below the support plate  6   a  is a test terminal block  9  that is adapted for connection with a corresponding test terminal block  8  that is supported by the carrier means  4  for displacement relative to the stationary support means  3 . The test terminal block  8  is so supported by the carrier means  4  that as the support means  6  and  3  are brought together as shown by the arrow x in  FIG. 1   c,  the contacts  9   a  of the test terminal block  9  carried by the movable support means  6  are brought into electrical engagement with corresponding contacts  8   a  of the test terminal block  8  that is carried by the stationary support means  3 .  
         [0023]     Upon continued displacement of the movable support means  6  toward the intermediate test position shown in  FIGS. 2   a - 2   c,  the test contacts  9   a  are brought into electrical contact with the corresponding test contacts  8   a  of  FIG. 2   b,  thereby to energize the test circuitry associated with the test terminal blocks, which circuitry is energized from the power supply  40  of  FIG. 1   b.  When the support members  3  and  6  are in this intermediate test position, the electrical contacts of the main terminal blocks  1  and  1 ′ have not yet been brought into electrical contact with each other. Upon further displacement of the moveable support means  6  toward the final contact position of  FIGS. 3   a - 3   c,  the contacts of the main terminal assembly  1  are brought into electrical engagement with the corresponding contacts of the associated main terminal block  1 ′, as shown in  FIG. 3   b.    
         [0024]     In accordance with a characterizing feature of the present invention, friction retaining means  10  ( FIG. 1   a ) are provided for locking the carrier means  4  in one of its end positions of travel. The carrier means  4  includes a generally U-shaped frame  11  ( FIG. 6 ) having a central panel portion  11   a,  and a pair of orthogonally-arranged side walls  11   b.  Similarly, the stationary support means  3  comprises a collar element having a central panel portion  3   a,  and a pair of orthogonally-arranged side walls  3   b.  Guide means  18  support the carrier member  11  for linear displacement in the given direction x relative to the stationary support means  3 . When in the assembled condition of  FIG. 7 , the side walls  11   b  are parallel with and in spaced relation from the corresponding side walls  3   b  of the stationary support member  3 , thereby to define a pair of spaces for receiving respectively on of the the friction retaining means  10  of the present invention.  
         [0025]     As best shown in  FIGS. 6 and 10   a,  the friction retaining means  10  includes a pair of locking levers  14  that are pivotally connected at one end by pivot pins  15  with the outer surface of one side wall  11   b  of the carrier member  11 . The other ends  14   a  of the locking levers are bifurcated to define a pair of outwardly directed detent portions. Arranged between the locking levers  14  is a control member  19  that is supported for axial displacement in a direction parallel with said given direction x. The opposed sides at one end of the control member  9  contain a pair of recesses  23  that cooperate to define an enlarged head portion  19   a  that is joined with the body portion of the control member by a neck portion  19   b.  The enlarged head portion  19   a  engages the adjacent surfaces of the inner detent portions at the bifurcated ends  14   a  of the two locking levers  14 , as shown in  FIG. 10   a.  The control member  19  is slidably displaceable within a through bore contained in a guide sleeve member  20  that is fastened to the outer surface of a side wall  11   b  of the carrier member  11 .  
         [0026]     Referring again to  FIGS. 1   a - 1   c,  the moveable support means  6 , which may be formed of metal or a suitable synthetic plastic material, includes a pair of parallel spaced resilient arm portions  6   b  that extend toward the stationary support means  3 . The support arms  6   b  are provided at their free extremities with hook-like extensions, and cooperate with the transverse wall portion  6   c  of the integral base portion  6   d  of the movable support means  6  to define a chamber  42  for receiving the guide sleeve  20  associated with the control member  19 . Compression spring  22  is mounted within a bore contained in the base of the body portion of the control member  19  for reaction with the transverse wall  6   c,  as will described in greater detail below. Thus, when the moveable support means  6  is displaced toward the stationary support means  3  in the direction illustrated by the arrow x in  FIG. 2   c,  the resilient arm portion  6   b  of the support member  6  engage external projections  20   a  contained on the outer surface of the guide member  20 , thereby to connect by a snap fit the support member  6  into engagement with the shoulder portions  20   a  on the outer surfaces of the guide sleeves  20  that are fastened to the side walls  11  of the carrier member  11 . As shown in  FIG. 2   c,  the compression spring  22  cooperates with the transverse wall  6   c  to bias the control member  19  to the left toward the stop position defined by the guide sleeve  20 , as shown in  FIG. 2   c.  As shown in  FIG. 2   b,  the pin and socket contacts  9   a  and  8   b  of the two test terminal blocks are now in engagement to control test circuits supplied with power from the power supply  40 . Upon further displacement of the moveable support means  6  toward the final connected position of  FIGS. 3   a - 3   c,  the extremities of the resilient arm portion  6   b  engage the bifurcated ends  14   a  of the locking levers  14 , thereby to pivot the same inwardly toward the unlocked position shown in  FIG. 3   c.  As shown in  FIG. 3   b,  the carrier member  11  is displaced in such a manner as to maintain the contacts of the two test terminal blocks  8  and  9  in continued engagement as the main terminal blocks  1  and  1 ′ are displaced toward the connected condition of  FIG. 3   b.    FIG. 4  illustrates the apparatus when in the test condition of  FIGS. 2   a - 2   c,  and  FIG. 5  illustrates the apparatus when in the finally assembled contact position of  FIGS. 3   a - 3   c.    
         [0027]     Referring now to  FIGS. 8   a - 8   f,  the operation of the friction retaining means  10  is illustrated schematically. More particularly, as shown in  FIG. 8   a,  when the moveable support member  6  is displaced toward the stationary support member  3 , the resilient actuating arms  6   b  are shifted to the right over the lateral projections  20   a  on the side walls of the guide sleeve  20 , whereupon the bottom wall  6   c  of the recess  42  engages the spring  22  mounted in a bore contained at the lower extremity of the control member  19 . As the actuating portion  6   d  is shifted to the right in  FIG. 8   b,  the locking levers  14  are pivoted inwardly to remove the outer detents from the locking recesses  17  contained in the stationary guide member  3 . Thus, the carrier member  11  is released for travel to the second position illustrated in  FIG. 8   c,  which is the final connected position in which the main terminal blocks  1  and  1 ′ are electrically connected as shown in  FIG. 3   b.    
         [0028]     To disconnect the main terminal blocks  1  and  1 ′, the moveable element  6  is displaced in the opposite direction as shown by the arrow in  FIG. 8   d,  whereupon the hook portions at the ends of the resilient actuating arms  8   b  engage the shoulder surface of the guide sleeve  20 , thereby to initiate displacement of the carrier member  11  to the left. When the outer detents on the locking levers reach the locking recesses  17 , the levers are separated by the enlarge head portion  19   a  of the control member, thereby to lock the levers  14  to the recesses  17 . Upon further displacement of the operating member  6   d  to the left, the enlarged head portion  19   a  of the control member is wedged into frictional engagement with the inner detents at the bifurcated end portions of the locking levers. If desired, the member  6   d  can be further displaced to the left to totally disengage the member  6  from the support member  3 , whereby the components are in the initial disengaged condition of  FIGS. 1   a - 1   c.    
         [0029]     In the modified embodiment of  FIGS. 9   a - 9   c,  the design is such that the control member  19  in the test position is already inserted so far that its head portion  19   a  no longer precisely engages between the inner detent portions of the locking levers  14 . This locking position is thus, so to speak, left again for the attainment of the test position according to  FIG. 2 , which offers the advantage that the mechanical components in the test position are further relieved of forces when the test position is retained, for example, for a longer period of time.  
         [0030]     Referring now to the modification of  FIGS. 10   b  and  10   c,  the resilient arm portions  106   b  of the moveable support member  106  are provided with ribbed inner surfaces  106   f  on the resilient arm portions  106   b  that engage corresponding external rib surfaces  120   f  on the outer surface guide sleeve  120 . This design is particularly stable and thus insensitive to variations in force.  
         [0031]     Of course, it is contemplated that the elements might be reversed so that the friction retaining means are mounted on the stationary support means  3  rather that the moveable support means  6 .  
         [0032]     While in accordance with the provisions of the Patent Statutes the preferred forms and embodiments of the invention have been illustrated and described, it will be apparent to those skilled in the art that changes may be made without deviating from the invention described above.

Technology Classification (CPC): 7