Plug-in cable connector

<b>FIELD OF THE INVENTION</b>

0001The invention is directed to a plug-in cable connector.

<b>BACKGROUND OF THE INVENTION</b>

0002A plug-in cable connector is, for example, known from DE-Gbm 93 11 781.7. The known plug-in connector does in fact permit substantial simplification in manufacture because of a sectional modular structure of the plug, yet does not permit direct adaptation to the requirements made in view of the special application with respect to supply of contacts in terms of number and position on the plug strip, and polarizing and/or coding of the plugs.

<b>SUMMARY OF THE INVENTION</b>

0003The purpose underlying the present invention is to provide a plug-in cable connector which may be produced and if necessary subsequently adapted in a simple way using a few mass-produced components and by using only the functionally necessary elements, i.e. without using additional components to be regarded as spacers, according to the requirements of present applications.

0004The plug-in cable connector according to the invention is constructed in modular fashion; due to the mirror-image half-and-half location of the walls, in connection with the design of a stop shoulder on the contact carrier module on the one hand and the incorporation of half walls in the module carrier casing on the other hand, each of the modules may be modules may be individually inserted in an operative manner into the casing, and forms a self-contained enclosed (electrically insulated) unit when incorporated. It is inserting empty modules and spacers in order to ensure the stability of mounting of the fitted module.

<b>BRIEF DESCRIPTION OF THE DRAWING FIGURES</b>

0005Further details of the invention characterized in the Patent Claims will be explained in the following with reference to the accompanying drawing, which shows: <ul id="ul0001" list-style="none"><li>Figure 1: A perspective view of a plug-in cable connector according to the invention with the plug casing open, and after assembly in the blade strip;</li><li>Figure 2: A perspective exploded view of a plug-in cable arrangement before insertion into the blade strip;</li><li>Figure 3: A perspective view of an individual contact:</li><li>Figure 4: A perspective view of a contact carrier module with partially occupied contact chambers and visible guide cams;</li><li>Figure 5: A perspective view of a prepared cable;</li><li>Figure 6: A perspective view of a contact carrier casing;</li><li>Figure 7: The module carrier casing shown in Figure 6 with cavities partially occupied, with tow modules;</li><li>Figure 8: The module carrier casing shown in Figure 6 with the cavities fully occupied, and screening provided;</li><li>Figure 9: A perspective view of the strain relief means for the plug, in an exploded view;</li><li>Figure 10: A perspective view of the locking means of the plug lock;</li><li>Figure 11: An enlarged perspective view of a wall;</li><li>Figure 12: A perspective view of an MF block.</li></ul>

<b>DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT</b>

0006The plug-in cable connector shown in the drawing serves to produce an external electrical cable connection with the contact strip of electronic/electrical components comprising a strip casing 1 with the blade contacts 2, and also comprises a module carrier casing 14 in the case of the present example, for accommodating four plate-like contact carrier modules, each of which in this case has five duct-like chambers 6 lying in series one behind the other for respectively accommodating a spring contact, as counter contacts.

0007The contact carrier modules 3 are provided with defining walls 4, 5 which half enclose the chambers 6 in a mirror-image in such a way that on one side of the defining wall 4, the upperhalf of the contact carrier module 3 is closed, and on the other side of the defining wall 5 the lower half of said contact carrier module 3 is closed, and the defining wall 5 forms with the lateral walls 9 which stand back to a relative degree, a shoulder 13. Correspondingly the module carrier casing 14 is provided with half-height walls 16, forming cavities 15, which form a stop means for the shoulders 13 of the contact carrier modules 3 in such a way that the wall 5 and the half-height lateral walls 9 complement one another to form an intermediate wall entirely covering or enclosing the contact carrier module 3. It is clearly seen from comparison of Figures 4, 6 and 7 that upon insertion of the contact carrier module 3 into the casing 14, due to the mirror-image half-and-half arrangement of the walls 4,5, and particularly to the design of the shoulder 13 at the defining wall 5, this wall complements the half wall 16 (Figure 7) to form an enclosed wall extending over the entire height of the contact carrier module, and which in turn closes the open side of the next adjacent module.

0008The lateral walls 9 of the chambers are each provided with a projection 11 forming with the chamber base an inwardly open groove 10, the counter contact 8 (Figure 3) being provided on one or both sides with a cam 12 projecting over its lateral limit, which, when inserted into the chamber 6, slides in the groove 10 as far as a position beneath the projection 11. In this way account is taken of the fact that, due to the mirror-image half-and-half arrangement of the defining walls 4,5, there is formed for the spring contact a tilting edge, across which the spring contact 8 could tilt and possibly drop out of the chamber 6 before assembly of the contact carrier module. The groove-spring type guidance thus undertakes, for the period before assembly of the plug, the function of stabilizing the position of the spring contact 8 in the chamber 6.

0009Furthermore, in order to center the spring contact 8 in the operative position, the legs 18 (of the springs) (Figure 3) are provided with lateral guide cams 7 abutting against the lateral walls 9 of the chambers 6.

0010The spring contacts shown in the drawing are blade-clamp contacts, whose blade clamping zone is formed by a pair of U-shaped upwardly or inwardly bent punched tabs 21,22 forming a slot 20 with blade edges, and whose central legs 21 form with lateral legs 22 an obtuse angle of more than 90°. In this way, in contrast to known blade-clamping zones of this type with legs forming a right angle, a certain elasticity of shape of the blade legs is achieved, so that greater flexibility is obtained with respect to the use of cables of differing cable cress-sections, i.e. cables with a cross-section varying within wide limits may simply applied to the same contacts.

0011The spring contact 8 (Figures 3 and 4) is provided with clamp tabs 23 as insulation crimps. The module carrier casing 14 is further provided with mounts for attachment of a metal plate 26 as electrical screening, which is provided on one side with windows (28) co-operating with corresponding cams 27 on the module carrier casing, and on the other side with resilient tabs 29 as an electrical connection to a zero conductor.

0012The module carrier casing 14 is located in a two-part plug casing 30, 31, one portion 30 of which is provided with an external window-like recess 33 having lateral slots 32, and with an internal cavity for accommodating a clamp as a cable strain relief means. It is formed (see in particularly Figures 2 and 9) by a U-shaped bow 35, 36 insertable from the outside through the slots 32, with lateral legs 13 having internal ribbing, and a clamp plate 39 insertable into the inner cavity, having slots 38 defined by exposed spring tongues 37, and into whose slots 38 the lateral legs 36 of the U-shaped bow engage with a snap action, wedging the exposed spring tongues 37 in their ribbing, this effect being reinforced by the ribbing; however this is also effective without ribbing as a result of a simple power-locking effect. In this way a cable strain relief means is obtained for conductors whose diameter varies within wide limits in that the ribbed legs 36 of the U-shaped bow are pushed to a greater or lesser degree into the slots 38 until the clamp engages securely on the cable. When screened conductors are used, the metal screening bent back after removal of insulation from the end of the conductor said screening being if necessary glued, is also engaged in the clamp 35, 36 and 39. The U-shaped bow 35, 36 and its clamp plate 39 is provided with beads 48 pressing into the conductor insulation, and, complementing this, with claws 49 pressing into the insulation, only the respective claw facing away from the plug becoming effective.

0013The tow halves 30 and 31 of the plug casing are respectively provided with a dovetail-shaped groove 40 for insertion of a double-groove coupling member 41, with the aid of which an optional number of plugs may be combined to form a block. In this respect, in order to adjust the plugs in the block, the dovetail-shaped grooves 40 are provided with a cam 42, and the double-groove coupling member 41 is provided with a corresponding bead 43 co-operating with cam 42.

0014In this respect, in a particularly advantageous embodiment of the invention, there is provided an MF block 47, having coding, polarizing and guide cams independent of the plug casing, and which is combined with one or a plurality of plugs to form a block by means of a double-groove coupling member. In this way a plug-in cable connector is provided in which coding and polarizing are effected independently of the plug so that, on the basis of identical components, the plug-in connector may be constructed in a way adaptable to all the special requirements of the user, and if necessary may be supplemented at a later point in time without requiring for this purpose the interchange of components which have meantime become superfluous or are no longer sufficient to requirements. The MF block 47 is provided on both sides with a C-shaped bow 50 on the module carrier housing and also the MF block projecting through a corresponding window aperture of the plug casing 30, 31 and serving as a pivotal bearing for the axis of pivoting 51 of a snap locking means, which is formed by a double-armed lever 52 and 53 pivotal about the axis of pivoting 51, one lever arm 52 of which, serving as a power arm, is in the form of a resiliently curved clamp clip, and the other lever arm 53 of which, serving as a load arm, is provided with inwardly-oriented engagement projections 54 which, upon insertion of the plug into the blade strip 1 and 2 engage with a snap action in corresponding windows 55 of a series of windows provided for this purpose in the casing 1 of the blade strip. In this case also, depending on the conditions of use, it is possible optionally to insert one or a plurality of securing means on one side or on both sides of a plug or of a plug group; in the cases where a plug group with a coding block is used, the plug securing means may also be simply inserted on the coding block. In the locked position the lever arm 52 supported on the module carrier casing acts as a power arm which, because of its resilient effect, holds the load arm 53 in the locked position. The locking means is released by finger pressure or, in the case of a high packing density, by means of the action of an auxiliary tool on the curved lever arm 52, so that the double-armed lever is pivoted, disengaging the engagement projections 54 from windows 55 by pivoting about axis 51.

0015The advantageous embodiment shown illustrates a plug-in cable connector with four contact carrier modules to five respective contacts, i.e. a 20-pole plug-in connector, which, taking into account standardization of the contact strips as 110 pole blade strips (constructive form A) has provided particularly advantageous, as in this way, in a blade strip corresponding to the standard, four 20-pole plug in cable connectors with MF block, or , in the case of 125-pole blade strips (constructive form B) up to five 20-pole plug-in connectors may be inserted without an MF block. In order in this context to permit the use of only one or two plug-in cable connectors spaced apart from one another, plug-i type inserts are sub-divided on the blade strip 1 and 2 for which purpose (see Figures 2 and 11) walls 56 are provided which are provided with bores 57 and lateral grooves 58 corresponding to the blade contacts 2, and with vertical grooves 59 as counter guides for the polarizing webs 46 located on the module carrier casing 14. The walls may simultaneously serve as screening, and for this purpose are produced from a conductive material, or may be provided with a coating, for example an evaporated-on coating of a conductive material.

0016Having described the preferred embodiment of the invention herein, it should be appreciated that variations may be made thereto without departing from the contemplated scope of the invention. Accordingly, the preferred embodiment are intended to be illustrative rather than limiting, the true scope of the invention being set forth in the claims appended hereto.