EP0892997B1 - Cable plug connector - Google Patents

Abstract

PCT No. PCT/EP97/01295 Sec. 371 Date Oct. 13, 1998 Sec. 102(e) Date Oct. 13, 1998 PCT Filed Mar. 14, 1997 PCT Pub. No. WO97/39495 PCT Pub. Date Oct. 23, 1997A cable plug connector (1) with at least one contact (3) fitted in a chamber of a contact carrier (2) and taking the form of a plug (8) which has an insulation displacement section (9) at its connection end (11) to contact an insulated cable lead (5) inserted into a blind hole (24) in the contact carrier (2) by means of an insulation displacement slot (16) fitted in a contact plate (14) running transversely to the plug-in direction, the insulation displacement section (9) is a separate part passing with the contact plate (14) through an aperture (20) in the connection end (11) of the plug (8). The contacts (3) are thus simply and economically suitable for the use of different lead diameters by exchanging the insulation displacement section (9). They are also usable with advantage especially in cable plug connectors (1) produced by injection molding because no special measures are needed to seal the plug contact regions. The invention is particularly suitable for practical manipulation to fit the contact plate (14) with snapping projections (19) which engage behind the lateral end sections of the aperture (20). This renders the insulation displacement section (9) captive through pre-snapping, further simplifies storage and assembly and makes it even cheaper. This advantage and even simpler production and assembly can also be obtained in a particularly suitable manner in that the insulation displacement section (9) has two guide arms (31) which, with bent end sections (32), preferably engage behind a cover section (41) which has through apertures (42) and U-shaped guides (25) for the insertion or guiding of the cable leads (5), and can be secured to the contact carrier.

Description

The invention relates to a cable connector according to the preamble of claim 1, as is already known for example from DE 42 14 711 C 1 in a multi-pole version. With this connector, the contact elements are manufactured as low-cost stamped and bent parts, and reliable contacts are made without stray wire strands and with automated wire feed. On the other hand, the contact elements are only suitable for one-time assembly, since they are clawed in the contact carrier and would damage it if it was pulled out violently to release the wire contact. In addition, this fixed design means that only cable cores of a very specific diameter corresponding to the clamping slot width can be connected. This means that a special cable connector is required for each type of cable.
In addition, the full length of the contact elements are to be inserted radially into the contact carrier, which must have correspondingly large openings for this purpose, which presents considerable difficulties in the case of overmolded designs or requires additional sealing measures.
Last but not least, due to their one-piece design, the contact elements cannot be optimally designed with regard to the material selection and the material costs, so that only a compromise between the most favorable properties of the insulation displacement connector and plug contact can be achieved.

In the case of mass products such as connectors, these are associated with the properties described Increased costs, particularly in the case of multi-pole versions, are generally not acceptable.

The invention is therefore based on the object of a cable connector of the type mentioned Art in such a way that the contact elements in a simple and inexpensive Way can be used for different wire diameters and the cable connector can also be overmolded with little effort. The above described should Get advantages of the cable connector known from DE 42 14 711 C1 stay.

This object is achieved by the characterizing features of patent claim 1. Due to the two-part structure, i.e. the separation of the plug contact and insulation displacement part, the two parts can also be easily detached from one another and thus insulation displacement parts with different width insulation displacement slots for contacting cable cores with different wire diameters can be inserted through the recess in the connection-side end part of the plug contact part. When using the cable connector for cables with different core diameters, only the insulation displacement parts designed as sliders and not the entire contact elements need to be replaced.
The plug-in contact part can be firmly and tightly inserted in the contact carrier, which means that the connector design according to the invention is also particularly suitable for extrusion coating, because no encapsulation material gets into the plug-in contact area of the contact carrier and, in contrast to the prior art, no additional sealing measures have to be taken for this . With the same contact carrier, either a cable connector that can be assembled or an overmolded connector can be produced, which additionally enables a reduction in storage.

From US Pat. No. 5,112,244 it is already known to use a plug contact part and a separate insulation displacement part. However, this contact device is not already part of a cable connector of the type mentioned, in which the cable wires are provided for insertion into an axial blind hole of a contact carrier and are spaced from the plug contact part.
Above all, no recess is provided in the known plug-in contact part, which is penetrated by the insulation displacement part for guiding it and exact positioning with respect to the desired insulation displacement contact point before contacting the cable core spaced from the contact element. Rather, the cable core rests on the connection-side end part of the plug contact element for absorbing the pressure when the contact plates are pressed in. In contrast to the invention, the contact plates are not guided in the longitudinal direction of the cable core, so that the correct position and clean contacting of the cable core transverse to the longitudinal axis of the plug contact element is not guaranteed.
Finally, due to its construction, the plug contact according to the US patent is not suitable for overmolding.

Advantageous embodiments and refinements of the invention are in the subclaims listed.

By forming the recess according to claim 2, a very good guidance of the contact plate is already achieved. This is further improved by a contact surface projecting at approximately 90 ° from the lower edge of the recess into the interior of the contact carrier. The contact plate to be actuated as a slide thereby hits the cable core to be contacted, without requiring special attention from the person installing it , so that optimal contacting is ensured because the cable wire penetrates into the intended position in the contact slot.
The manufacturing costs of this support surface are particularly low if it is formed according to claim 4 by simply punching out and pressing out of the connection-side end part of the plug contact part.

The two clamping legs formed by the insulation displacement slot are also somewhat elastic transversely to the insulation displacement slot and can therefore be compressed somewhat at least at the free ends. This property is used in an embodiment according to claim 5 in the following way:
When the contact plate is pressed in, the clamping legs are pressed together to such an extent that they can be inserted with the latching lugs ahead through the recess in the connection-side end part of the plug-in contact part. After passing through the recess, the clamping limbs spring up to their desired distance, as a result of which the latching lugs engage behind the edge sections of the recess, that is to say the insulation displacement parts are pre-latched and are therefore captively arranged in the contact element. This is the delivery condition, so that no separate parts have to be kept ready for assembly on site.
To make it easier to insert the contact plate, the locking lugs have a conical insertion bevel.
To pull the contact plate out of the recess, e.g. B. in the case of exchange for another insulation displacement part, the clamping leg ends are slightly compressed using a simple tool.

As a surface for attaching a tool (e.g. pliers) for insertion, especially but for pulling out the contact plate through the recess of the connection-side end part the plug contact part, it is advantageous to a z. B. tab-shaped extension according to claim 7 to provide, which according to claim 8 by embossing (or by ribs or the like) is stiffened in order to be able to safely absorb the forces exerted by the tool.

By an advantageous embodiment according to claim 9, the adjacent outer parts correspond the desired contact target position of the contact plate at which the optimal terminal connection reached and shearing of the cable core at the top of the blind hole is effective is prevented. At the same time can between the non-contiguous area of the extension and the connection-side end part of the plug contact part a tool for pulling out the contact plate be introduced.

The extension could also be omitted entirely or designed so that no tool intervention exists between it and the connection-side end part of the plug contact part. In this case it is advantageous, according to claim 10, to engage a tool through a corresponding recess or a breakthrough in the protruding outwardly beyond the connection-side end part Section of the contact plate.

According to claim 11, a further advantageous construction of the insulation displacement part consists in execute the extension according to the contact plate, the width of the two contact slots can be of different sizes, so that two by simply turning the insulation displacement part Core diameters are covered.

Due to a particularly advantageous embodiment of the connection-side end part of the plug-in contact part according to claim 12, the two clamping legs of the contact plate are kept stable in their desired position, thereby effectively preventing expansion when the cable core penetrates. In this way, not only is a consistently high contact force of the insulation displacement part ensured, but also an undesired sliding back of the contact plate and thus a loosening of the contacting is avoided simply and safely. In addition, the clamping legs can be made narrower without reducing the required contact force. This enables a smaller design, which meets a basic requirement for connectors.
Above all, however, this design ensures a permanently secure conductive connection between the plug-in contact part and the insulation displacement part, even with strong shaking movements, as a result of which the relevant advantage of a one-piece design of the contact elements is retained despite the two-part construction according to the invention.

In one embodiment of the cable connector according to claim 13 is simple clean guidance of both the cable cores and the contact plate. That is always ensures that the insulation displacement contact is optimally in the right place the cable wires and in the intended area of the insulation displacement slot.

It is particularly advantageous to have this U-shaped insulating part according to claim 14 with the Execute contact carrier in one piece, because it makes the production more cost-effective and that Part is stable.

In an alternative construction of the cable connector with the area on the connection side of the contact part closing cover part, the U-shaped insulating part can accordingly Claim 15 can be made in one piece with this cover part. It protrudes when the cover part is installed on the face side up to the inserted contact plate in a contact chamber of the Contact carrier. The end face of the edge part of the blind hole extends from the plug side also almost to the inserted contact plate, so that between the two end faces a slot-like recess for inserting the contact plate is formed.

In comparison to the described embodiment according to claim 14, in which the U-shaped insulating part is integral with the contact carrier, the insulating part itself therefore does not have to have a slot. Together with its arrangement on the cover part, this enables faster, more reliable and more cost-effective production, in particular through much simpler tools and production steps (for example in the injection molding process).
In addition, with this construction, the insertion of the cable core is completely problem-free, because it only has to be pushed through the through-opening, which is expediently adapted to the core cross-section and provided with an insertion funnel, and thereby slides automatically through the U-shaped insulating part into the blind hole. Particularly in the case of multi-pole cable connectors, quick assembly is achieved because all that is required is to insert the single wires on the clearly visible and accessible cover surface into the insertion funnels of the through openings and then push the entire cable. As a result, the wires are securely inserted into the associated blind holes without fear that the insertion process would be hindered by seating of wires on edge parts of the U-shaped insulating parts.

In multi-pole versions, it is advisable to pair the U-shaped parts by 180 ° to be arranged offset to each other (claim 16), because then by a simple, on two opposite Pliers-like tool attacking extensions each have two contact plates can be inserted at the same time for contacting two cable cores.

If the configuration of the contact elements is symmetrical and not an asymmetrical one Already an unmistakable arrangement of the cover part and contact carrier causes an embodiment of the u-shaped insulating parts according to claim 17 a simple Coding possibility. This is particularly so when the cable connector is molded and there is no housing for attaching coding elements.

The cover part and the contact carrier can be either fixed or releasably connected to one another according to claims 18 and 19. While the first solution, which can be realized by overmolding, gluing or plastic welding, is inexpensive and particularly suitable for tight cable connectors, the second version, e.g. made by screw, clip or snap-in connection, enables the same contact carrier with different cover parts to be used, which insertion openings for different have strong cable cores.
In addition, this releasability allows the insulation displacement parts to be replaced in a simple manner (if necessary also individually) for those whose contact plates have insulation displacement slots of different dimensions. This enables a high degree of adaptability to a wide variety of applications.

According to a further advantageous embodiment of the cable connector according to claim 20, the cover part has at least one recess which, when the cable connector is installed, engages in an end projection of the contact carrier.
It is particularly expedient if, according to claim 21, the contact chamber partition walls of the contact carrier, which are present anyway, engage in adapted groove-shaped recesses in the cover part and gaps between the U-shaped insulating parts. This not only simplifies assembly by means of exact positioning and fixing of the cover part on the contact carrier, but also a particularly simple coding option without an additional part and also with a symmetrical construction of the cable connector and identically designed U-shaped insulating parts.

A cable connector in which all contact elements are arranged according to claim 22 are, is particularly easy to use in an advantageous manner. It is useful to all Contact elements should also be arranged in one plane, so that the axial length of the cable connector is as low as possible.

Due to an embodiment specified in claim 23, there is also a minimal one The scope or diameter of the cable connector can be reached, which makes it essential overall contributed to its miniaturization.

If in special cases (e.g. with plug-in distributors) several cable wires to one contact element to be connected, it is advantageous to use the contact plate according to claim 24 a corresponding number of insulation displacement slots and an equal number of blind holes. According to the diameters of the cable wires to be connected the slot widths can be the same or different.

If the cable connector is not overmolded, it usually has the contact carrier closely comprehensive, e.g. B. in the form of a grip sleeve formed housing. In this case a structure according to claim 25 particularly cheap because after the application of the grip sleeve without the slightest additional effort, an additional securing of the insulation displacement part in the Target contact position is reached and thus permanent, secure contacting of the cable cores is also guaranteed if the cable connector is exposed to strong vibrations is.

Due to the low material thickness of the plug-in contact part designed as a sheet metal stamped part, the contact plate to be inserted through its recess (especially without a support according to claim 3) is unstable in the vertical direction and an exact insertion for contacting the cable core is difficult.
Through a particularly advantageous embodiment of the insulation displacement part according to claim 26, a secure guidance of the insulation displacement part in the desired direction is ensured in a simple manner even if the force exerted on this for inserting or removing the insulation displacement part does not act, or only partially, in the desired direction, so that at the same time tilting is effectively prevented.
The guidance in the plane perpendicular to the plug axis is achieved by guide surfaces along which the connection-side and the plug-side surface of the guide arms slide. The distance between the guide surfaces is slightly larger than the material thickness of the guide arms, so that both easy sliding and adequate guidance of the guide arms is achieved in the plane mentioned.

A particularly simple production results if, according to claim 27, the guide surfaces for the connection-side surfaces of the guide arms are attached in the cover part, because this makes uncomplicated tools possible.
The guidance of the insulation displacement part in the desired direction within said plane is already sufficient for many applications that the guide arms tightly enclose the U-shaped insulating parts on the sides and the outer edges of the clamping legs slide along the inner surfaces of the side walls of the connection-side end part of the contact part. To further improve this guidance, it is provided according to an advantageous embodiment of the cable connector according to claim 28 that the side edges of the guide arms run at a very small distance from the contact chamber partitions.

The insulation displacement part is simple and inexpensive to set up and manufacture if it - e.g. as a stamped sheet metal part - is made in one piece (claim 29).

A particularly advantageous embodiment of the insulation displacement part is specified in claim 30. This to an education according to claim 5 alternative realization of a captive In contrast, the arrangement of the insulation displacement part has the advantage that the clamping legs no need for protruding tabs protruding outwards. This is the side Space requirement of the insulation displacement part is minimized, so that the contact chambers are also weaker can be executed. This in turn means the dimensions of the cable connector transverse to the axis (in the case of circular connectors, the diameter) is smaller and therefore corresponds a basic requirement for electrical connectors.

In addition, in this embodiment, the outer edges of the clamping legs can slide along the entire length of the partition walls and thereby further improve the guidance of the insulation displacement part.
Above all, the clamping legs do not have to be resilient (transversely to the insulation displacement slot), so that a much larger selection of materials is available for the insulation displacement part and, in particular, rigid materials can be selected, which moreover ensure a defined crushing of the wires in the insulation displacement slot.

The holding shoulders can be designed as parts of the contact carrier, but this would make its structure more complex and would only permit rigid materials for the insulation displacement part to a limited extent.
An advantageous embodiment of the cable connector therefore consists, according to claim (31), as a holding shoulder area of already existing on the cover part, for example - as described - to form a groove-shaped recess for receiving a contact chamber partition wall existing.
Preferably, the guide arms are approximately as long as the clamping legs of the contact plate. In this way, a maximum extension length of the guide arms is achieved, so that even when using thicker cable wires, the contact plate can be pushed back so far that the cable wire can be pulled out of the cable connector.

The loosening of a wire contact by pulling out the insulation displacement part is special easy to handle by inserting a simple tool between the extension of the Insulation displacement part and the base wall of the connection-side end part of the plug contact part. This is facilitated without additional effort in that according to claim 33 of the extension a slightly bent tab is extended.

Fig. 1:

- eine teilweise geschnittene perspektivische Ansicht des ersten Kabelsteckverbinders mit zwei noch nicht angeschlossenen und zwei angeschlossenen Kabel-adern,

Fig. 2:

- je eine perspektivische Ansicht eines Kontaktelements mit eingeschobener und nicht eingeschobener Kontaktplatte,

Fig. 3:

- eine teilweise geschnittene Draufsicht auf den Kontaktträger mit zwei Schneidklemmanschlüssen in Vorverrastungsposition, einer angeschlossenen Kabelader und einer Anschlußstelle ohne Kontaktelement,

Fig. 4:

- eine teilweise geschnittene perspektivische Ansicht des zweiten Kabelsteckverbinders mit zwei angeschlossenen und zwei nicht angeschlossenen Kabeladern,

Fig. 5:

- eine perspektivische Ansicht des Schneidklemmteils,

Fig. 6:

- eine perspektivische Ansicht eines Kontaktelements mit teilweise eingeschobener Kontaktplatte,

Fig. 7:

- eine steckseitige Draufsicht auf die Innenseite des Deckelteils und

Fig. 8:

- eine teilweise geschnittene Draufsicht auf den Kontaktträger mit zwei gelösten Schneidklemmen (Vorverraststellung), einer angeschlossenen Kabelader und einer Anschlußstelle ohne Kontaktelement.

The invention is explained in more detail below with reference to a first exemplary embodiment of a cable connector with four wire connections shown in FIGS. 1 to 3 and shown in FIGS. 4 to 8, the same parts being designated with the same numbers in both exemplary embodiments. Show it:

Fig. 1:

a partially sectioned perspective view of the first cable connector with two not yet connected and two connected cable wires,

Fig. 2:

a perspective view of a contact element with an inserted and not inserted contact plate,

Fig. 3:

a partially sectioned top view of the contact carrier with two insulation displacement connections in the pre-latching position, a connected cable core and a connection point without contact element,

Fig. 4:

a partially cut perspective view of the second cable connector with two connected and two non-connected cable wires,

Fig. 5:

a perspective view of the insulation displacement part,

Fig. 6:

a perspective view of a contact element with a partially inserted contact plate,

Fig. 7:

- A plug-in top view of the inside of the cover part and

Fig. 8:

- A partially sectioned top view of the contact carrier with two released insulation displacement clamps (pre-latching position), a connected cable wire and a connection point without a contact element.

The cable connector 1 according to the first embodiment consists of a plastic contact carrier 2, four contact elements 3 arranged therein for electrical connection the stranded wires 4 of four insulated cable wires 5 of a cable 6 and one of the contact carriers 2 housing in the area of the cable connection, designed as a grip sleeve 7.

The contact elements 3 each consist of a plug contact part 8 and a separate one Insulation displacement part 9. Each plug contact part 8 is on the plug side as a blade contact 10 for insertion formed in adapted sockets of a mating connector, not shown, and has an approximately U-shaped connection-side end part 11 with a base wall 12 and two side walls 13 on.

The insulation displacement part 9 consists of a contact plate 14 and a protruding therefrom at right angles Extension 15. The contact plate 14 is an insulation displacement with an insulation displacement slot 16, which has an inlet slope 17 for the safe insertion of a cable core 5 has. The clamping legs 18 formed by the insulation displacement slot 16 wear on free end protruding outwards 19.

In the base wall 12 there is a slot-shaped recess running transversely to the direction of insertion 20 attached through which the contact plate 14 into the interior of the connection-side end part 11 as far can be inserted until the extension 15 with angled outer parts 21 on the outer surface the base wall 12 abuts. The width of the recess 20 corresponds approximately to that of the contact plate 14 and is less than the clear mutual distance of the locking lugs 19. These are equipped with an insertion bevel 22 on its front face.

When the contact plate 14 is inserted, it slides on the side edges of the recess 20 along, whereby the free end portions of the clamping legs 18 so far compressed elastically be that the contact plate 14 is inserted through the recess 20 can be. Then snap the clamping legs 18 apart, so that the locking lugs 19 engage behind the lateral edge portions of the recess 20 with locking shoulders 23 and the insulation displacement part 9 captive, however - in contrast to the prior art one-piece contact elements - detachable in the plug-in contact part if necessary using a simple tool is arranged (pre-locking position).

Due to this releasability, other contact plates 14 can be made different if necessary dimensioned insulation displacement slots 16 are used.

The contact carrier 2 has four blind holes running in the axial direction of the cable connector 1 24 for inserting the free end sections of the insulated cable wires 5, which are on the connection side in U-shaped, open towards insulation displacement part 9, with contact carrier 2 continue one-piece guide parts 25, the shape and dimensions of the cable cores 5 adapted are. At the level of the recess 20, they each have a slot 26 into which the Contact plate 14 can be inserted at the front for clean guidance transversely to the connector axis A. The guide parts 25 are arranged in pairs with a common base and open Recesses 27 of the contact carrier 2 through which the insulation displacement parts 9 are introduced can be.

Furthermore, the contact carrier 2 has four axial bushings 28 for inserting the knife contacts 10 on. They are dimensioned such that their walls due to the elasticity of the plastic of the contact carrier 2 bear under pressure on the knife contacts 10 and thereby one Sealing effect. This is e.g. B. then advantageous if an injection molding instead of the housing 7 is provided because an undesired penetration of extrusion material into the plug area is effectively prevented without additional effort.

When assembling the cable connector, due to its simple construction without can also be done on site, after stripping an end piece of the cable 6 the insulated single wires 5 are fully inserted into the blind holes 24. To contact the cable wires 5 now only need two insulation displacement parts located opposite each other 9 by means of a simple plier-shaped tool at the same time, and thus inexpensively the pre-latching position are pushed into the slot 26 with the tong arms on attack the outer surfaces of the extensions 15. After fully inserting the contact plate 14 (contact target position), the outer parts 21 of the extensions 15 lie on the associated ones Base walls 12, with an intermediate space 29 remaining between these and the extensions 15, which is dimensioned such that for releasing the insulation displacement parts 9 as required Tool parts can be introduced.

So that the pliers arms both when pushing in and pulling out the IDC parts 9 forces exerted on the extensions 15 can be safely absorbed, are each provided with an embossing 30 for stiffening.

When pressing the contact plates 14 into through the blind holes 24 and the guide parts 25 exactly positioned and due to the fact that they lie on both sides of the slots 26 on the walls the blind holes 24 and guide parts 25 for penetration into the insulation displacement slots 16 fixed cable loaders 5 are first the wire insulation on the edges of the run-in slopes 17 cut and then the stranded wires 4 in the insulation displacement slots 16th pressed in such a way that with deformation and partial compression of the stranded wires permanently secure contacting of the stranded wires 4 via the contact plates 14 and under Spring pressure on the locking lugs 19 adjacent side walls 13 of the plug contact parts 8 with their Knife contacts 10 is guaranteed even under unfavorable environmental conditions. Due to the structure described, there are short circuits due to stray wire strands safely avoided.

In the desired contact position, the extensions 15 are so far in the recesses 27 of the contact carrier 2 inserted that its outermost parts with the outer contour of the contact carrier 2 are flush. On the one hand, this is a further safeguarding of the contact target position all insulation displacement parts 9 achieved and at the same time ensured that these positions have actually been taken up by the insulation displacement parts 9 during their assembly, because otherwise the last assembly step, namely sliding the handle sleeve 7 on the contact carrier 2 could not be carried out due to the above parts.

The cable connector according to the second embodiment also consists of a Plastic contact carrier 2, four contact elements 3 arranged therein for electrical connection the stranded wires 4 of four insulated cable wires 5 of a cable 6 and one of the Contact carrier 2 in the area of the cable connection closely encompassing, designed as a grip sleeve Housing 7.

The contact elements 3 also each consist of a plug contact part 8 and a separate one Insulation displacement part 9. Each plug contact part 8 is on the plug side as a blade contact 10 for Inserted into adapted sockets of a mating connector, not shown and has an approximately U-shaped connection-side end part 11 with a base wall 12 and two Side walls 13 on.

The insulation displacement part 9 consists of a contact plate 14 and a protruding therefrom at right angles Extension 15. The contact plate 14 is an insulation displacement with an insulation displacement slot 16, which has an inlet slope 17 for the secure insertion of a cable core 5 having. However, the clamping legs 18 formed by the insulation displacement slot 16 bear no latches.

The extension 15 has two integral with it, parallel to the clamping legs 18 and with these approximately the same length guide arms 31, the free end pieces 32 are angled in the connection-side direction by 90 °.
The guide arms 31 each have a connection-side surface 33, a plug-side surface 34 and an inner and an outer longitudinal edge 35, 35 '. The plug-side surfaces 34 rest on the connection-side end face 36 of the connection-side end part 11 of the plug contact part 8. The area of the extension 15 lying between the guide arms 31 is extended as a tab 37 which is bent outwards at a small angle.

In the base wall 12 of the plug contact part 8 there is a cross-section to the plug direction slot-shaped recess 20 through which the contact plate 14 into the interior of the connection-side end part 11 can be inserted until the extension 15 on the outer surface the base wall 12 abuts. The width of the recess 20 is slightly larger than that the contact plate 14. When the contact plate 14 is inserted, its side edges slide 38 on the inner surfaces of the side walls 13 of the connection-side end part 11 of the plug contact part 8 along.

The contact carrier 2 has four contact chambers 40 separated from one another by partitions 39, in which the insulation displacement contacting of the stranded wire cores 4 of the cable cores 5 with the contact elements 3 takes place. They are on the connection side and - for actuating the insulation displacement parts 9 - open on the side.
An axial blind hole 24 is provided in each contact chamber 40, into which the associated insulated cable core 5 can be inserted.

Furthermore, a cover part 41 made of plastic is provided in this cable connector 1, which after the introduction of the contact elements 3 in the contact carrier 2 with the latter is firmly connected by plastic welding. The cover part 41 has four through openings 42 with insertion funnel 43, which protrudes as a U-shaped plug Continue guide parts 25, the wire receiving areas in shape and dimension of the cable loader 5 are adapted.

When the cover part 41 is fastened, the guide parts aligned with the holes 24 are immersed 25 so far into the contact chambers 40 of the contact carrier 2 that between their free End faces 44 and the edge parts of the blind holes 24 at the level of the recess 20 of the connection side End part 11 of the plug contact part 8 has a slot for inserting the contact plate 14 is formed.

The cover part 41 also has four L-shaped walls 45, the short legs 46 of which are each include an axial groove-shaped recess 47. The guide parts 25 are in pairs separated from one another by gaps 48, 48 ′, which run perpendicular to the cutouts 47. These recesses 47 and gaps 48, 48 'are arranged such that they are joined together of cover part 41 and contact carrier 2, the connection-side end regions of the partitions 39 of the contact chambers 40. This means that the correct assignment is identical trained and axially symmetrically arranged guide parts 25 and contact chambers 40 and a clean alignment of guide parts 25 and blind holes 24 guaranteed and an exact pre-fixation for the welding process is also achieved.

When the cover part 41 is fastened, the connection-side surfaces 33 of the guide arms 31 bear against the end surfaces 49 of the L-shaped walls 45. The guide arms 31 are thus guided in the axial direction between these end faces 49 and the connection-side end faces 36 of the end part 11 of the plug-in contact part 8, and tilting in the recess 20 is reliably avoided.
In the transverse direction, the same advantage is achieved by guiding the side edges 38 of the clamping legs 18 of the contact plate 14 on the side walls 13 of the connection-side end part 11 of the plug-in contact part 8 and the inner longitudinal edges 35 of the guide arms 31 on the guide parts 25 and at the same time the outer longitudinal edges 35 'of the Guide arms 31 achieved on the inner surfaces of the chamber partitions 39.

The wall parts 50 of the longer legs 51 projecting laterally beyond the guide parts 25 the walls 45 also serve as a stop for the pulled (opened) insulation displacement parts 9, which are thereby captive in a simple manner.

This second embodiment is characterized by a particularly uncomplicated and construction that can be produced inexpensively using simple tools. Besides that Insulation displacement part 9 is not designed to be resilient, but can be made of rigid, a defined one Material ensuring clamping force.

Finally, assembly can be carried out quickly and safely using the following assembly steps:
After insertion of the contact plate 14 of the insulation displacement parts 9 through the recesses of the plug contact parts 8, the contact elements 3 thus completed are inserted with their knife contacts 10 through the openings provided in the contact carrier 2. Then the cover part 41 is placed on the contact carrier 2 so that the cross-shaped partitions 39 engage in the groove-shaped recesses 47 of the L-shaped walls 45 and in the gaps 48, 48 'between the guide parts 25 and an inner cover surface 52 on a corresponding one contact surface of the contact carrier 2 rests.
Cover part 41 and contact carrier 42 are now welded.
The cable connection can then be made with the contact carrier 2 completely pre-assembled and closed with the cover part 41. For this purpose, the insulation displacement parts 9 are first pulled out of the end part 11 of the plug contact part 8 until the end pieces 32 stop on the wall parts 50 of the walls 45. For this purpose, a simple tool (for example a screwdriver) is inserted between the connection-side end of the extension 15, which is designed as a somewhat outwardly bent tab 37, and the connection-side end part 11 of the plug contact part 8 and pressed outwards.

Subsequently, the four non-stripped cable wires 5 are inserted into the lead-through openings 42 of the cover part 41 and, at the same time, are inserted into the blind holes 24 up to the stop by guiding the entire cable 6.
To contact the stranded wires 4 with the insulation displacement parts 9, these are now only to be pressed into the contact chambers, which can be done using a simple plier-like tool.
The assembly of the cable connector 1 is finally completed by inserting the connected contact carrier 2 into a housing 7.

Claims (33)

1. Cable plug connector with at least one contact element (3) which is disposed in a chamber of a contact support (2) and which is formed as a plug contact part (8), which on the connection-side end part has an insulation displacement part (9) for contacting a cable core, which core is inserted in a blind hole in the contact support and is insulated and spaced apart from the plug contact part, by means of an insulation displacement slit provided in a contact plate (14) extending transverse to the direction of insertion,
   characterised in that the insulation displacement part (9) is a separate part which, with the contact plate (14), for the guidance thereof and before contact thereof, passes through a cut-out (20) in the connection-side end part (11) of the plug contact part (8), which cut-out is adapted on all sides to suit the cross-section of the contact plate (14).
2. Cable plug connector according to claim 1, characterised in that the cut-out (20) is adapted to the cross-sectional contour of the contact plate (14).
3. Cable plug connector according to claim 1 or 2, characterised in that the cut-out has a bearing surface towards the inside of the plug.
4. Cable plug connector according to claim 3, characterised in that the bearing surface is pressed out of the connection-side end part of the plug contact part.
5. Cable plug connector according to one of claims 1 to 4, characterised in that the two clamping limbs (18) of the contact plate (14), which enclose the insulation displacement slit (16), have outwardly directed latching projections (19), the distance between them being greater than the width of the cut-out (20).
6. Cable plug connector according to claim 5, characterised in that the latching projections (19) have a run-in slope (17).
7. Cable plug connector according to one of claims 1 to 6, characterised in that the insulation displacement part (9) has an extension (15) angle-bent by about 90° with respect to the contact plate (14) and disposed on the outside, opposite the cable connection side, of the connection-side end part (11) of the plug contact part (8).
8. Cable plug connector according to claim 7, characterised in that the extension (15) has at least one embossed part (30).
9. Cable plug connector according to claim 7 or 8, characterised in that the extension (15) is formed in such a way that during contact with the cable core (5) it lies with its outer parts (21) on the outer surface of the connection-side end part (11) of the plug contact part (8).
10. Cable plug connector according to one of claims 7 to 9, characterised in that the end portion of the contact plate located outside the connection-side end part of the contact element has a recess.
11. Cable plug connector according to one of claims 2 to 10, characterised in that the cross-section of the extension corresponds to that of the contact plate of the insulation displacement part in the region of the insulation displacement slit and also has a contact slit.
12. Cable plug connector according to one of claims 1 to 11, characterised in that the connection-side end part (11) of the plug contact part (8) is formed in a U-shape and the two side walls (13) lie under pressure against the outer surfaces or edges of the latching projections (19) of the inserted contact plate (14).
13. Cable plug connector according to one of claims 1 to 12, characterised in that above the insertion region of the blind hole (24) a U-shaped insulating part (25) is disposed, the opening of which faces the contact plate (14) of the insulation displacement part (9) and, at the level thereof, has a slit (26) adapted to its contour.
14. Cable plug connector according to claim 13, characterised in that the insulating part (25) is one piece with the contact support (2).
15. Cable plug connector according to claim 13, characterised in that the insulating part (25) is one piece with a cover part (41), which can be connected to the contact support (2), issues on the connection-side into a core passage opening (42) in the cover part (41) and protrude [sic] on the plug side into chambers (40) of the contact support (2).
16. Cable plug connector according to one of claims 13 to 15, characterised in that a plurality of insulating parts (25) are provided and are disposed in such a way that in each case two connection-side end parts (11) of the plug contact parts (8) lie opposite each other offset by 180°.
17. Cable plug connector according to claim 16, characterised in that the outer contour of at least one insulating part (25) and the chamber (40), adapted thereto, of the contact support (2) is different from the rest.
18. Cable plug connector according to one of claims 15 to 17, characterised in that the cover part (41) is fixedly connected to the contact support (2).
19. Cable plug connector according to one of claims 15 to 17, characterised in that the cover part (41) is releasably connected to the contact support (2).
20. Cable plug connector according to one of claims 15 to 19, characterised in that the cover part (41) has at least one cut-out which engages into a connection-side projection of the contact support (2) when the cable plug connectors (1) are assembled.
21. Cable plug connector according to claim 20, characterised in that the free end regions of the separating walls (39) can be inserted into appropriately adapted groove-like recesses (47) in the cover part and the gaps (48, 48') between the U-shaped insulating parts (25).
22. Cable plug connector according to one of claims 1 to 21, characterised in that all the contact elements (3) are disposed in such a way that their extensions (15) point outwardly.
23. Cable plug connector according to claim 22, characterised in that the extensions 15 are disposed symmetrically with respect to the middle axis (A) and the most outwardly protruding parts coincide with the plug outer contour.
24. Cable plug connector according to one of claims 1 to 23, characterised in that the contact plate and - in an embodiment according to claim 11 - the extension have two or more contact slits.
25. Cable plug connector according to one of claims 1 to 24, having a housing (7) closely encompassing the contact support (2), characterised that the most outwardly extending part of the insulation displacement part (9) lies against the inner surface of the housing (7) when this insulation displacement part is in its correct contacting position.
26. Cable plug connector according to one of claims 1 to 25, characterised in that the insulation displacement part (9) has two guide arms (31) protruding from the extension (15) in the insertion direction and closely surrounding the U-shaped insulating parts (25) at the sides when the insulation displacement part (9) has been pushed in, the connection-side and plugside surfaces (33, 34) of which guide arms slide, during insertion or extraction, along guide surfaces of the contact support (2) and - in the case of an embodiment according to one of claims 15 to 21 - of the cover part (41).
27. Cable plug connector according to claim 26, having a cover part (41), characterised in that the surfaces (34) of the guide arms (31) facing the contact plate (14) lie on the connection-side end surface (36) of the end part (11) of the plug contact part (8) and the surfaces (33) of the guide arms (31) facing away from the contact plate (14) lie on the end surface (49) of a wall (45) of the cover part (41).
28. Cable plug connector according to claim 26 or 27, characterised in that the mutual spacing of the outer edges (35'), facing away from each other, of the two guide arms (31) of each insulation displacement contact part (9) is only slightly smaller than the clear space between the associated contact chamber separating walls (39) and that the clear space between the two guide arms (31) of each insulation displacement part (9) is only slightly larger than the outer dimension of the U-shaped insulating parts (25).
29. Cable plug connector according to one of claims 26 to 28, characterised in that the guide arms (31) are one piece with the insulation displacement part (9).
30. Cable plug connector according to one of claims 26 to 29, characterised in that the guide arms (31) have end pieces (32) which are angle-bent in the connection-side direction and which engage behind a respective holding shoulder when the insulation displacement part (9) is not in contact.
31. Cable plug connector according to claim 30, having a cover part (41), characterised in that the holding shoulders (50) are formed by the walls (45) of the cover part (41).
32. Cable plug connector according to one of claims 26 to 31, characterised in that the length of the guide arms (31) corresponds to the greatest length of the clamping limbs (18) of the contact plate (14).
33. Cable plug connector according to one of claims 26 to 32, characterised in that the extension (15) has a tab (37) protruding between the guide arms (31) in the axial direction of the cable plug connector (1) beyond the guide arms (31), which tab is bent back slightly in the outwards direction.

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