Abstract:
A clamp/plug connector for through-wall connection includes a clamp housing of an insulating material. A locking element is provided for attaching the clamp housing to a wall. A pivotable actuation wedge is connected as a single piece to the locking element.

Description:
The present invention relates to a clamp for through-wall connection or a plug connector for through-wall connection having a locking element for attaching the clamp housing, which is made of insulating material, to a device or housing wall. 
   BACKGROUND 
   In clamps or plug connectors for through-wall connection in a one-piece embodiment, it is known that these are inserted up to a fixed stop on their housing, which is made of insulating material, into a housing wall opening and the wall thickness of the housing wall is then clamped on the housing wall rear, using a wedge, a screw, or a spreading component, between the fixed stop and the wedge or the screw. 
   It is known from DE 36 13 681 C1 that, in particular in a two-part insulating material housing, an external part may have an internal part pushed into it in such a way that the two housing halves may clamp a sheet metal wall of a device front, which is provided with a through opening, between them, the external part and the internal part having elements which may engage with one another, so that a sturdy connection arises between the two housing halves and the through clamp becomes a fixed clamp housing. This fixed through clamp, which is particularly sufficient for individual connections, is not sufficient for the rougher plug connector connection having high plugging and pulling forces as well as jerky tilting and removal motions. 
   A through-wall clamp made of a plate-shaped insulating material body for electrical conductors, which also has a stop for applying the through clamp to the wall passage to position the through-wall clamp, the device wall having a springy U-shaped catch strap having two springy, pre-tensioned catch legs, which receives a housing wall between a stop on a clamp and the U-shaped catch strap, which may be pushed on as an additional part, is known from DE 198 01 260 A1. Since this clamp is a clamp for through-wall connection for individual connections of electrical conductors, when actuating the conductor contact means, only slight forces act on the attachment point of the clamp for through-wall connection even in the cutout of the wall through opening. This clam for through-wall connection having its attachment does not have sufficient connection stability for a plug connector having high plugging and pulling forces and for the back-and-forth movements frequently used in handling by a tool or by a plug when removing or plugging in the tool or a plug connector, so that in this case as well, in the event of rough handling, both the clamp connection of the PE connector and also the additional clamping using the clamping strap do not ensure sufficient attachment of the clamp for through-wall connection. 
   SUMMARY OF THE INVENTION 
   It is an object of the present invention to provide a clamp/plug connector for through-wall connection in regard to the attachment to a housing wall in such a way as to save space and components. Additional, alternative, objects of the present invention are set forth in the following sentences: The clamp/plug connector for through-wall connection is to be mounted or dismounted as rapidly and easily as possible without screws, rivets, or the like, the insertion and attachment of the entire clamp for through-wall connection being made possible from one wall side of the device. The cutout tolerances of the wall passage opening and also the wall thickness of the housing or device wall itself are not have any influence on the interference fit of the through clamp and/or the through plug connector. According to an object, additional screw holes or threaded holes in the housing wall are to be dispensed with, whose individual parts, such as screws, rivets, and other included attachment parts for the interference fit of the clamp or plug connector for through-wall connection may thus advantageously be dispensed with. The one-piece clamp/plug connector for through-wall connection provided for an object is to have a good interference fit in the housing wall opening not only for the action of an actuation tool for connecting an electrical conductor or against the plugging or pulling forces of a plug, but rather also clamp/plug connectors for through-wall connection which are made of arbitrarily many disk-shaped assembled insulating material housings are to have a secure interference fit in the through opening of the housing wall. 
   In an embodiment variation for connection of plug connectors on both sides in particular, this attachment is to be significantly improved in relation to the related art, because a significant load acts on the attachment elements through plugging and pulling forces. This type of attachment is to have nearly the same attachment effect as a screw connection because of this. 
   The present invention provides a clamp/plug connector for through-wall connection. The clamp/plug connector includes a clamp housing including an insulating material; a locking element for attaching the clamp housing to a wall; and a pivotable actuation wedge connected as a single piece to the locking element. 
   The achievement of the object allows secure attachment of a one-piece clamp/plug connector for through-wall connection, or a clamp/plug connector for through-wall connection preferably conceived in disk construction, having extremely solid seating in the housing wall with a special design of the attachment means. The attachment provided for one-piece connection housings has an advantageous effect for a row of plate-shaped connection housings if these are engaged with one another into a block from a freely selectable number of plate-shaped single housings. For this purpose, the attachment means are engaged as a component to the outer insulation material housings of the block or plugged on via a dovetail guides and thus solidly connected before the wall mounting. 
   The attachment means are shaped in this case so that they are conceived as a springy, narrow catch means and are attached laterally to the narrow side of a clamp or plug connector for through-wall connection. The U-shape provided allows precisely fitted plugging in of the resulting connection block. When the clamp or plug connector for through-wall connection is plugged into the opening of a device or housing wall, this movement is only allowed up to a stop on the clamp an/or plug connector housing. 
   An effective attachment is achieved by a wedge lock according to the present invention. This is provided on both sides of the one-piece or disk-shaped connection housing block. The constructive design of the locking element offers the possibility in particular of mounting the clamp or plug connector for through-wall connection from one side of the device or housing wall. For this purpose, the locking element is implemented as a U-shaped strap. The external dimensions of the clamping legs of the strap, which spring outward, are dimensioned so that there is a slight excess dimension in relation to the height of the wall cutout. When this U-shaped strap is plugged through, it is pressed through the edges of the opening, so that a slight clamping arises even in the plugged-in state. This is advantageous because tolerance variations of the through opening may thus be compensated for. For the precise positioning of the strap, an inner curve is provided on its outer side toward the edge of the through opening, into which an edge of the housing wall may snap because of the U-shaped strap, which bends elastically outward. This snapping of the attachment element is supported according to the present invention by a wedge-shaped pivot element, which is connected in one piece to the U-shaped support strap via a narrow connection web  21  of the legs of the U-shaped support strap. The wedge-shaped pivot element may be moved back-and-forth elastically around this narrow connection web, the pivot element being dimensioned in such a way that upon pivoting of the wedge-shaped pivot element, the free end of the wedge clamps the second strap end on the inner side of the housing opening. For this purpose, the contact surface of the pivot element toward the bottom side of one leg of the U-shaped strap is dimensioned in such a way that with increasing pivot angle, the clamp between the contact surfaces is increased. With increasing pivot angle, the pivot element acts, through its one-piece connection to the first leg of the U-shaped support strap, like a wedge between the contact legs and presses them outward against the inner edge of the wall opening. 
   In order that this wedge effect does not come loose automatically in case of use due to the wedge automatically pivoting back in the event of vibrations or other influences, slip safeties are provided on its contact surface and on the interior of the support strap which counteract automatic detachment. The embodiment of the locking wedge allows rapid mounting without tools, the wedge being able to be pressed to catch audibly between the legs of the support strap using the fingers. To remove the wedge when the clamp or plug connector for through-wall connection is removed, because of the interference fit of this wedge, an insertion opening for a screwdriver blade is provided. Depending on how solidly this wedge element is pressed between the legs of the support strap, a light or solid seating of the strap and therefore of the entire clamp/plug connector for through-wall connection may thus be achieved. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     In the following, the present invention will be described on the basis of an exemplary embodiment and the figures associated therewith. 
       FIG. 1  shows an exemplary arrangement in a clamp/plug connector for through-wall connection in a perspective view, which was assembled from plate-shaped connection housings. 
       FIG. 2  shows a locking element in the open state. 
       FIG. 3  shows a locking element in the clamped position. 
   

   DETAILED DESCRIPTION 
   As an example,  FIG. 1  illustrates the arrangement of a clamp/plug connector for through-wall connection  1 , comprising plate-shaped connection elements  3 , the plate-shaped connection elements  3  each having connection points in different designs for electrical conductors using spring force or screw technology, for example. These plate-shaped connection elements  3  are attached to one another using catch means or dovetail guides in this case, so that they are held together to form a solid connection block. The number of the connection elements  3  may advantageously be selected freely here according to the application. This clamp/plug connector for through-wall connection  1  is, in a preparation for insertion into a through opening of a device or housing wall  2 , whose dimensions are predefined, provided laterally with a locking element  5 , which advantageously produces a solid connection to the clamp/plug connector for through-wall connection by engagement using known catch means or by plugging in using known dovetail guides. For an interference, fit of the clamp/plug connector for through-wall connection  1 , an arrangement on both sides as shown in  FIG. 1  is necessary. In order that, upon the attachment of the locking element  5 , catch means of the last plate-shaped connection element  3  projecting on one side of the clamp/plug connector for through-wall connection  1  in plate-shaped construction do not interfere, a terminal element  4  is engaged, which in turn has any arbitrary known catch or plug means for a solid connection between the locking element  5  and the clamp/plug connector for through-wall connection  1 . In this case, the catch or plug means are positioned in such a way that the locking element  5  may only be attached in one alignment to the clamp/plug connector for through-wall connection  1 . This clamp/plug connector for through-wall connection  1  thus completed is subsequently inserted into the opening of the housing or device wall  2 . For this purpose, the clamp/plug connector  1  for through-wall connection has height dimensions smaller than the height of the through opening. In order that the clamp/plug connector for through-wall connection  1  may assume a predefined position in relation to the wall passage, a stop  10  is provided in the insertion direction on the individual plate-shaped connection elements  3 , which prevents the clamp/plug connector for through-wall connection  1  from being inserted completely through. 
   The locking element  5  is implemented as essentially U-shaped as shown in  FIG. 2 , the particular legs  6 ,  7  of the engaged locking element  5  still projecting through the opening of the housing or device wall  2  in the stop position of the clamp/plug connector for through-wall connection  1 . The installer may determine the correct final position of the clamp/plug connector for through-wall connection  1  in that the locking elements  5  snap behind the housing or device wall  2  shortly before the final position, which is predefined by the stop  10 . For this purpose, undercuts  8 ,  9  are provided on the edges  19 ,  20  of the side of the legs  6 ,  7  facing toward the wall opening, which allow the legs  6 ,  7 , which are pressed together in the insertion procedure, to expand. Because of the clamp parts  14 ,  15  projecting into the wall passage region, which are formed from the end pieces of the legs  6 ,  7 , support of the legs  6 ,  7  of the support strap of the locking element  5  is ensured. 
   The locking element  5  has a wedge-shaped actuating part  18  between its legs  6 ,  7 . This is connected to the clamp legs  7  via a flexible connection web  17 . The actuating part  18  may be actuated easily in the X direction through thumb pressure. To open the wedge connection in the Y direction, the actuating part  18  has an insertion opening  12  for an actuating tool, a screwdriver blade  11  being advantageous for this purpose. Therefore, the actuating wedge  18  may be moved out of the clamped position between the first leg  6  and second leg  7  of the support strap of the locking element  5  via its flexible support web  16 . In this case, the side of the wedge-shaped actuating part  17  facing toward the second clamp part  15  is constructed in such a way that as the actuating part  18  pivots increasingly, its contact surface  13  approaches the back of the clamp part  15  having its contact surface  14  and this contact surface enters a press fit with the counter contact surface in its pivoted final position. In this case, the actuating part  18  is supported via the flexible support web  17  on the first leg  7 . In order that the wedge connection does not detach automatically by pivoting back, ribs aligned transversely to the actuating direction are provided on the contacting surfaces  13  of the actuating part  18  and the corresponding clamp part surface  14  of the clamp part  15 , for example, which mutually exchange. 
   A pivot position of the actuating part  18  is shown in  FIG. 3 , in which the contacting surfaces  13  and  14  are engaged. The actuating part  18  is thus clamped between the leg  7  having the support web  17  and the first clamp part  15 , the surfaces  13 ,  14  facing toward one another pressing against one another. The actuating part  18  is driven in this case like a wedge into the free space between the first and second legs  6 ,  7  of the support strap of the locking element  5 , which are supported via the clamp part  15 ,  16  on the inner edge of the wall opening. When the clamp/plug connector for through-wall connection  1  is removed, the actuating part  18  is pivoted out of the U-shaped support strap of the locking element  5  with the aid of an actuating tool  11 , the transverse teeth on the surfaces  13 ,  14  facing toward one another being overcome because of the press fit. By pressing together the clamp parts  15 ,  16  projecting through the wall opening, the clamp for through-wall connection  1  may be removed.