DE102007018762A1 - Connector for electrically connecting two or more components comprises a contact pin having contact elements joined together by press connections - Google Patents

Abstract

Connector (1) comprises a contact pin (16) having a number of contact elements joined together by press connections. An independent claim is also included for a method for producing a connector. Preferred Features: The contact elements are inserted into the housing and at an angle to each other. An inserting contact element (18) has an opening (32) into which is pressed a pressing post of a connecting contact element (20) at a right angle to the contact element. The connecting contact element has a contact connection in place of the pressing post.

Description

The The invention relates to a connector according to the Preamble of claim 1.

Connectors, having an electrical contact serve to an electrical make conductive connection between two or more components. The mechanical connection of the electrical contacts is solvable, subdivided conditionally solvable and insoluble. releasable electrical connections can after connecting through a mechanical force will be separated again. For example, by Pulling out a connector from a connector receptacle. conditioned detachable electrical connections are for example soldered contact pins, which must be soldered to disconnect. electrical Compounds which are insoluble, u. a. when soldering or welding an electrical contact with a Printed circuit board or with a cable.

are releasable electrical connections pluggable, so will the corresponding arrangement referred to as a plug connection. An example this is the connector of a spring bar with a Male connector, which is as often as possible solvable.

Several electrical contacts in a connector, which the function have a conductor, must be against each other electrically be isolated. For this purpose, the electrical contacts placed in an insulating body, usually made of high-resistance plastic. The installation tolerance of the electrical Contacts, which are designed here as contact pins, in the insulating body must be chosen so that this with a plug connection are pluggable.

For the introduction of the contact pins in the insulating body there there are several solutions. In a solution, the Contact pins in the insulating body or in a carrier insulating body frictionally pressed, wherein the Trägerisolierkörper then introduced into a housing. In another solution, the contact pins are through an injection molding process with the insulating material, for. B. Plastic, overmoulded.

One Connector can in addition to the connector function even more Have functions. Thus, the insulating body of the connector forms, for example a housing for electronic assemblies, with which they are also electrically isolated and against environmental influences are protected. Examples of electronic assemblies are electronic circuit carriers, as with electronic Components equipped printed circuit boards.

A Subgroup of connectors that provide an additional insulating Housing have connectors that are angled Have contact pins.

Such a connector is in DE 197 07 421 C2 disclosed. This document shows a rectangular housing made of thermoplastic material for receiving a printed circuit board on which are formed at right angles curved contact pins. The contact pins are introduced by an injection molding process in the connector.

Other solutions are in DE 10 2004 024 718 A1 and DE 201 12 595 U1 shown. The angled contact pins are arranged here, also with an injection molding process in the insulating body.

The Housing in the above documents form in the area the plug connections of the contact pins a connector collar out, so that corresponding mating connector can be added.

One Disadvantage of such solutions are the high production costs, which arise in small and medium production quantities. change For example, the relative position of the circuit board to the housing and thus the location of the terminals for the contact pins and the location of the plug-in connections, so must the length the punched contact pin and the Abwinkelbereich accordingly be adjusted. This requires new ones in many cases Punching tools for punching out the extended contact pins and new ones Tools for the subsequent bending of the contact pins. These tools have smaller and medium quantities a low utilization, which is above average Depreciation costs arise.

A Another solution provides the insulator in a housing and split into a Trägerisolierkörper. In the Trägerisolierkörper the contact pins firmly inserted, then the housing equipped with this. Here are the contact pins, which spaced in parallel on the Trägerisolierkörper are arranged, in accordance parallel spaced Pinkanäle immersed in the housing from the inside of the housing and passed through the housing to the outside. The spacing, or the arrangement of the Pinkanäle allowed this is not too strong of the corresponding arrangement of the contact pins Diverge, as they are no longer just through the Pinkanäle can be dipped through. That's why Close manufacturing tolerances are met, which leads to high production costs to lead.

In contrast, the present invention seeks to provide a connector that can be produced inexpensively and easy to install is.

This is inventively achieved in that the Connector has an insulating housing in which a electrical contact structure recorded with at least one contact pin is whose sections for contacting from the housing led out, the contact pin a variety of contact elements joined together by press-fitting are connected.

advantageous Further developments of the invention are the subject of the dependent claims.

The Contact elements, for example, by inserting into the housing connected with each other. Here, the contact elements are preferably arranged at an angle to each other. Due to the multi-part design the contact elements is not a bending tool during its production, which would bend the contact pins, more necessary, whereby costs are saved. Another advantage is that out few contact element groups, which, for example, by their length differ, a variety of angled ones Contact pins with different geometry can be formed.

at a preferred embodiment of the connector has this is a plug-in contact element, which is a press opening in which a press stud of a terminal contact element perpendicular to the plug contact element non-positively is pressed.

From Advantage is when the press opening of the plug contact element is circular and the press stud of the terminal contact element has a rectangular cross-section, the edges of the press post are rounded or chamfered. By the rounded Edges of the press post can cause chip formation during press-fitting of the press post in the press opening are avoided. The press opening is according to the peripheral shape of the Pressing post when pressing in sections plastically and elastically deformed, creating a strong non-positive connection achieved.

Instead of a press jaw can also be used as press-fit connection, hereinafter referred to as contact terminal for the sake of simplicity, be designed.

Preferably is a circular at the press opening of the plug contact element Developed a lead. When pressing the press post into the press opening The area of the ledge and the press posts becomes major elastically deformed, whereby a residual elasticity in the Pressing zone is preserved to thermal, chemical, climatic and mechanical stresses that the non-positive Compound can harm, counteract.

at a preferred embodiment has the plug contact element a rectangular press stud with rounded peripheral edges and the terminal contact member has a circular press opening.

in this connection may also be at the press opening of the terminal contact element a circular projection may be formed, which the the same function as in the above-described plug contact element.

The Plug contact element has instead of a press jaw preferably a contact connection.

In Further embodiment of the invention has the terminal contact element a contact terminal or a press post or a solder post, for connecting to a circuit carrier or with a PCB. As a result, the circuit carrier without additional retaining means connected to the housing become.

Preferably is the terminal contact element or the plug contact element in Connection area to the press post or contact connection stepped. The stage can be used as a stop when compressing the two Contact elements serve and thus determine the Einpresstiefe the press jamb.

The Housing for receiving a contact element usually has a terminal contact guide and a plug contact element guide, which are arranged perpendicular to each other and crossed have a common crossing area.

The Terminal contact element guide and the plug contact element guide may include the contact elements adjacent. It may be even possible that between the guides and the contact elements is a press fit, whereby the contact elements even more firmly inserted into the connector.

preferably, The press openings are located in the crossing area of the guides the terminal contact elements or the plug contact elements.

The Terminal contact elements and plug-in contact elements according to the invention dipped into the guides for the guide stop.

The connector can be further verbes when a terminal contact guide has an open end. This open end can serve as a visual control window in order to check the connection of the contact elements.

Of the Circuit carrier has advantageously recesses for Recording the contact connections or the pressing posts or the solder post of the terminal contact elements.

For example the circuit carrier is located at an inner circumferential level of the housing.

It may be beneficial if the internal volume of the housing is divided by a housing rib. This can be a spatial separation of the components on a circuit board or be achieved on a circuit board and the Rigidity of the housing can be increased.

At the male contact side of the housing is preferably a plug collar formed, this being the plug contact elements framed.

at Contact elements, which at the press opening a circular Form projection, the corresponding terminal contact guide and the plug contact element guide of the housing advantageously with a further guide recess designed to take the lead.

at a preferred method for producing a connector with an electrical housing in which an electric Contact structure is recorded with at least one contact pin, whose end portions for contacting from the housing can be carried out with the following steps become. Two contact elements of the contact pins are inserted into the housing and then pressed together. Usually become the contact elements of different housing end faces used here.

preferred Embodiments of the invention will be described with reference to schematic Drawings explained in more detail. Show it:

1a a perspective view of a connector according to a first embodiment of the present invention;

1b a perspective view of a connector according to the first embodiment of the present invention

2 a cross-sectional view of the connector according to the first embodiment of the present invention;

3a a perspective view of contact elements according to the first embodiment of the present invention;

3b a perspective view of contact elements according to the first embodiment of the present invention;

4 a cross-sectional view of a connector according to a second embodiment of the present invention;

5 a perspective view of the contact elements according to the second embodiment of the present invention;

6a a perspective view of the contact elements according to a third embodiment of the present invention;

6b a perspective view of a projection of the contact elements according to the third embodiment of the present invention;

7a a perspective view of the contact elements according to a fourth embodiment of the present invention;

7b a perspective view of a projection of the contact elements according to the fourth embodiment of the present invention;

8a a perspective cross-sectional view of a connector according to a fifth embodiment of the present invention;

8b a perspective of a connector according to the fifth embodiment of the present invention;

9 a perspective view of a connector according to the third embodiment.

In 1a is a perspective view of a first embodiment of the connector 1 shown, which consists of a housing 2 and an electrical contact structure 4 consists. In 1b becomes the connector 1 out 1a from a different viewing angle. The housing 2 is cuboid in these figures and to a circuit board side 6 open. The edges of the outer circumference of the housing 2 are partially rounded off. An end section 8th the contact structure 4 is for contacting from the housing 2 led out and is from a plug collar 10 , which on a plug contact element side 12 of the housing 2 is formed, framed. The frame of the plug collar 10 has an O-shaped circumference, the corresponding out leads to record a specific, matched to its dimensions mating connector. The other end section 14 the contact structure 4 lies inside the housing 2 , is parallel to the plug contact element side 12 placed a little bit apart and passing through the PCB side 6 limited. The contact structure 4 is in this connector 1 with contact pins 16 constructed, each formed of a plurality of contact elements.

In 2 is a sectional view of the connector 1 of the first embodiment, wherein the cut surface perpendicular to PCB side 6 , along the line A from 1a runs. It becomes the structure of the contact structure 4 out 1a visible, here from three contact pins 16 consists. A contact pin 16 has in each case two contact elements 18 . 20 on, namely a plug contact element 18 and a terminal contact element 20 ,

These contact elements 18 . 20 be in the case 2 via appropriate guides 22 . 24 added. The plug contact element 18 is doing in the plug contact element guide 24 introduced, which to the plug contact element side 12 is open and parallel to the PCB side 6 runs. In the connection contact element guide 22 is the terminal contact element 20 These are from the PCB side 6 towards the top of the housing 3 is introduced. The guides 22 . 24 are thus arranged crossed perpendicular to each other and have a common crossing area 26 , The cross-sectional area of the guides 22 . 24 corresponds to the largest cross-sectional area of the respective received contact element 18 . 20 , The contact elements 18 . 20 Therefore, sections of the corresponding guides 22 . 24 enclosed. It is also possible the cross-sectional areas of the guides 22 . 24 slightly smaller than the cross-sectional areas of the contact elements 18 . 20 to design a compression between the contact elements 18 . 20 and the guides 22 . 24 to produce, whereby an additional frictional connection between the housing 2 and the contact elements 18 . 20 would be realized.

The guides 22 . 24 each have a guide stop 28 . 30 on, the immersion depth of the respective contact elements 18 . 20 can limit. In the crossing area 26 the guides 22 . 24 there is a press opening 32 of the plug contact element 18 , which ensures that a press post 34 of the terminal contact element 20 dive into it. The contact elements 18 . 20 form after pressing a structure that in their physical properties formed from a single stamped part Kontaktpin 16 is very similar.

Because the guides 22 . 24 the contact elements 18 . 20 include in the installed state, these are electrically insulated against each other and better protected against buckling when applying external, especially axial forces through the jacket, as is the case with conventional solutions. Instead of a right angle, the guides can 22 . 24 be introduced with another angle to each other in the housing, in which case the contact elements 18 . 20 have this angle when joining. In principle, even contact pins 16 conceivable, which would then consist of a contact element.

According to 2 is located in the interior of the insulating housing 2 a housing rib 36 , which divides this into several areas. Thus, components can be located on a circuit board 38 located, spatially in the housing 2 be separated from each other. Furthermore, in the housing 2 an inner peripheral level 40 formed on the then the circuit carrier 38 is applied. The circumference level 40 is slightly spaced from the terminal contact guide 22 in the case 2 inserted and runs parallel to the housing top 42 , The narrow side 44 the housing rib 36 , the circuit board side 6 is facing, is located approximately at the same height as the peripheral level 40 , with which the circuit carrier 38 additionally by the rib 36 is supported. It is also possible the narrow side 44 the housing rib 36 slightly spaced from the height of the circumferential step 40 form and the distance to the PCB side 6 to enlarge, to a double fit, consisting of housing rib 36 and perimeter level 40 in conjunction with the circuit carrier 38 , to prevent.

After the assembly process of the contact elements 18 . 20 in the case 2 you have a structure that is an angled contact pin 16 equivalent. It is thus no longer necessary bending tool, which the contact pins 16 would bend in a separate process. The contact elements 18 . 20 are made by a punching tool. Due to the simple geometry, the individual contact elements 18 . 20 be adapted to different applications through little effort. With a few contact element types, a variety of different contact structures 4 be formed.

The loading of the contact elements 18 . 20 with the housing 2 takes place automatically with appropriate placement machines. Because the contact elements 18 . 20 from the outside into the housing 2 can be fitted, this results in more freedom of movement for a placement tool, especially for small enclosures, which is why an assembly process is easier and thus cheaper. A manual loading of the housing 2 is also possible, where for pressing a simple device is sufficient.

In 3a and 3b become the contact elements 18 . 20 of the connector 1 , according to the first embodiment, shown in a perspective view. The plug contact element 18 in this case has an elongated lath-shaped structure, wherein the end portion 46 which is from the housing 2 protrudes (see 2 ), tapered to a point. The press opening 32 is on the opposite end section 48 circular and extends through the plug contact element 18 therethrough. The connection contact element 20 forms the press post 34 by the contact element width is stepped in the press-pin area. The transition between press posts 34 and a middle part 50 is through two stages 52 . 54 formed, each having a right angle. In the press opening 32 becomes the press post 34 of the terminal contact element 20 perpendicular to the plug contact element 18 non-positively pressed. The press post 34 of the terminal contact element 20 has a rectangular cross-section and rounded or chamfered edges 56 , wherein the cross section is slightly larger than the circular cross section of the press opening 32 ,

When pressing the plug contact elements 18 with the connection contact elements 20 be the press opening 32 and the press post 34 partially plastically and elastically deformed. Is used instead of the rectangular cross section of the press post 34 formed a round cross-section, so are by the excess of the press jamb 34 Substantial higher press-in forces are necessary, since the whole circumference of the press post 34 and the press opening 32 partially plastically and elastically deformed. By overpressing the contact elements 18 . 20 there is a safe electrical and mechanical connection. It is also conceivable instead of a circular press opening 32 a rectangular press opening 32 to use, whereby the Einpresskräfte would sink again something.

In the assembled state, the step surface 58 the stage 52 . 54 on the broad side of the plug contact element 18 in the area of the press opening 32 abuts, whereby a defined press-in depth of the terminal contact element 20 in the plug contact element 18 can be realized.

After joining both contact elements 18 . 20 can the plug contact element 18 stronger in its axial direction than the terminal contact element 20 , are loaded by tensile and compressive forces, since it is form-fitting with the press opening 32 the press post 34 of the terminal contact element 20 embraces. The terminal contact element 20 on the other hand, in the case of an axial force only becomes force-locked in the press opening 32 of the plug contact element 18 held.

The connection contact elements 20 have at their circuit board side end a contact connection 60 on, with which a non-positive connection to a circuit carrier 38 or a circuit board (see 2 ), will be produced. Instead of a contact connection 60 can on the terminal contact element 20 a press post or a solder post are formed, as required. At a solder post, the circuit carrier 38 soldered with this and thus positively connected.

In 4 is a perspective sectional view of a connector 1 (same cutting plane as in 2 ) shows a second embodiment. This is not the plug contact element 18 a press opening, as in the first embodiment, but here has the terminal contact element 20 a press opening 62 , As a result, the terminal contact element 20 stronger than the plug contact element 18 , be subjected to tensile and compressive stress.

In addition, the placement order of the contact elements changes 18 . 20 , It is in contrast to the first embodiment, only the terminal contact element 20 introduced into the housing and then the plug contact element 18 ,

In 5 become the contact elements 18 . 20 of the second embodiment 4 shown enlarged.

A perspective view of contact elements 18 . 20 of a third embodiment is In 6a shown. The connection contact element 20 forms here at its circular press opening 62 a lead 64 out, which in the assembled state with the plug contact element 18 towards the end of a contact terminal 22 of the plug contact element 18 has. Due to its special geometry, the contact connection mainly becomes when pressed together 66 elastically deformed while the press opening 62 and the lead 64 stay undeformed. By the projection 64 there is a larger contact surface between the pressing surface 68 the press opening 62 and the contact connection 66 for non-positive connection, resulting in higher holding forces between the contact elements 18 . 20 can be transmitted. Thus, the two contact elements 18 . 20 a mainly elastic compound, which is known as a functional element and best described. Such elastic compounds are very well suited to form an always solid compound under thermal, chemical, climatic and mechanical environmental influences.

The press opening 62 of the terminal contact element 20 is plug contact element side with an inner peripheral phase 70 provided, which in 6b through the cutout A off 6a is pictured. At the end of the contact connection 66 of the plug contact element 18 is a pyramidal tip 72 educated. The circumferential phase 70 the press opening 62 and the top 72 serve to make the contact elements 18 . 20 Center when assembling when the axis of the plug contact element 18 within the circle is the outer circumference of the peripheral phase 70 forms. Such tips 72 are also in the other embodiments of the contact elements 18 . 20 educated. Another advantage of the circumferential phase 70 is that this is significantly reduced by the chip formation during pressing.

In 7a is a fourth embodiment of the contact elements 18 . 20 disclosed in a perspective view. In this case, the plug contact element 18 as in 3 a press opening 62 on. At the press opening 62 is a lead 64 formed in the detail view of section B in 7b is shown and the projection 64 out 6a equivalent. The connection elements 18 instead of a press jamb 34 , as in 3a , a contact connection 74 on.

A fifth embodiment in a perspective sectional view of the connector 1 is 8a shown, the section of the 2 equivalent. Here, the connection contact element guide 22 an open end 76 towards the top of the housing 42 on. In 8b becomes a whole body of the connector 1 shown, with the openings of the ends 76 the terminal contact guide 22 are visible, which as a visual control window 78 serve, bringing a reliable joining of the contact elements 18 . 20 can be monitored.

In 9 becomes the assembly process of the terminal contact elements 20 and the plug contact elements 18 in the case 2 of the third embodiment. So that the guides 22 . 24 (Guide 24 in 9 not visible) in the housing the projection 64 of the terminal contact element 20 or the plug contact element 18 can accommodate (depending on the embodiment), these are with another guide recess 80 designed. Their cross section corresponds to that of the projection 64 and their length is equal to the length of the guide 22 or 24 ,

When fitting the contact elements 18 . 20 First, the terminal contact elements 18 which the press openings 62 have, with these ahead in the respective terminal contact element guides 22 plugged. The immersion depth is either by the stop 28 (please refer 2 ) or by the placement tool. The press opening 62 is located in the crossing area after the immersion process 26 (please refer 2 ) of the two guides 22 . 24 , Subsequently, the plug contact elements 18 with the contact connection 66 ahead in the plug contact element guide 24 plugged into the press opening 62 of the terminal contact element 20 pressed. The immersion depth is determined by the stop 30 (please refer 2 ) of the plug contact element guide 24 , or through the steps 52 . 54 or determined by the placement tool.

Disclosed is a connector with an insulating housing and an electrical contact structure therein, the end portions of which the housing are led out, wherein the contact structure consists of several contact elements, which via a Press connection are connected together.

1

connector

2

casing

4

Contact structure

6

PCB side

8th

end

10

plug collar

12

Plug contact element side

14

end

16

contact pins

18

Plug contact element

20

Terminal contact element

22

Terminal contact element guide

24

Plug contact element guide

26

crossing area

28

guide stop

30

guide stop

32

Press opening

34

Press post

36

housing rib

38

circuit support

40

peripheral step

42

Housing top

44

narrow side

46

end

48

end

50

midsection

52

step

54

step

56

edge

58

step surface

60

Contact Termination

62

Press opening

64

head Start

66

Contact Termination

68

Press area

70

circumferential phase

72

top

74

Contact Termination

76

Restricted The End

78

Visual inspection window

80

guide recess

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19707421 C2 [0008]
• - DE 102004024718 A1 [0009]
• - DE 20112595 U1 [0009]

Claims (24)

Connector with an insulating housing ( 2 ), in which an electrical contact structure ( 4 ) is received with at least one contact pin whose end sections ( 8th ; 14 ) are accessible for contacting, characterized in that the contact pin ( 16 ) a plurality of contact elements ( 18 . 20 ), which are interconnected by press connections. Connector according to claim 1, wherein the contact elements ( 18 . 20 ) are connectable by insertion into the housing. Connector according to claim 2, wherein the contact elements ( 18 . 20 ) are arranged at an angle to each other. Connector according to claim 3, wherein a plug contact element ( 18 ) a press opening ( 32 ) into which a press post ( 34 ) of a terminal contact element ( 20 ) at right angles to the plug contact element ( 18 ) is pressed force fit. Connector according to claim 4, wherein the press opening ( 32 ) of the plug contact element ( 18 ) is circular and the press post ( 34 ) of the terminal contact element ( 20 ) has a rectangular cross-section and the peripheral edges ( 56 ) of the press post ( 34 ) are rounded. Connector according to claim 3 or 4, wherein the terminal contact element ( 20 ) instead of a press jaw a contact terminal ( 74 ) having. Connector according to claim 4 to 6, wherein at the press opening ( 62 ) of the plug contact element ( 18 ) a circular projection ( 64 ) is trained. Connector according to claim 3, wherein the plug contact element ( 18 ) has a rectangular press stud with rounded peripheral edges and the terminal contact element ( 20 ) a circular press opening ( 62 ). Connector according to claim 8, wherein at the press opening ( 62 ) of the terminal contact element ( 20 ) a circular projection ( 64 ) is trained. Connector according to claim 8 or 9, wherein the plug contact element ( 18 ) instead of a press jaw a contact terminal ( 66 ) having. Connector according to one of the preceding claims, wherein the terminal contact element ( 20 ) a contact connection ( 60 ) or a press post or a solder post, for connection to a circuit carrier ( 38 ) having. Connector according to claim 6 or 10, wherein the terminal contact element ( 20 ) or the plug contact element ( 18 ) in the connection area to the press post or contact connection with steps ( 52 . 54 ) is graduated. Connector according to one of the preceding claims, wherein the housing ( 2 ) for receiving a contact element ( 18 . 20 ) a terminal contact guide ( 22 ) and a plug contact element guide ( 24 ), which are arranged perpendicular to one another and crossed over a common crossing area ( 26 ) exhibit. A connector according to claim 13, wherein the terminal contact guide ( 22 ) and the plug contact element guide ( 24 ) the contact elements ( 18 . 20 ). A connector according to claim 14, wherein in the crossing region ( 26 ) of the guides ( 22 . 24 ) the press openings of the terminal contact elements ( 20 ) or the plug contact elements ( 18 ) are located. A connector according to claim 15, wherein the terminal contact elements ( 20 ) and the plug contact elements ( 18 ) up to a guide stop ( 28 . 30 ) in the guides ( 22 . 24 ) are immersed. A connector according to claim 16, wherein the terminal contact guide ( 22 ) an open end ( 76 ) having. A connector according to claim 17, wherein the open end of the terminal contact guide ( 22 ) a visual control window ( 78 ). Connector according to claim 11, wherein the circuit carrier ( 38 ) Recesses for receiving the contact terminals or the pressing posts or the soldering posts of the terminal contact elements ( 20 ) having. Connector according to one of the preceding claims, wherein the housing ( 2 ) an inner peripheral level ( 40 ) has on the circuit carrier ( 38 ) is present. Connector according to one of the preceding claims, wherein on the plug contact element side ( 12 ) of the housing ( 2 ) a plug collar ( 10 ) is formed, wherein this the plug contact elements ( 18 ) framed. A connector according to claim 13, wherein the terminal contact guide ( 22 ) or plug contact element guide ( 24 ) with a further guide recess ( 80 ) are configured for receiving the circular projections ( 64 ) of the terminal contact elements ( 20 ) or the plug contacts lemente ( 18 ). Method for producing a connector ( 1 ) with an electrical housing ( 2 ), in which an electrical contact structure ( 4 ) with at least one contact pin ( 16 ) whose end sections ( 8th . 14 ) for contacting from the housing ( 2 ) are led out, with the steps - insertion of two contact elements ( 18 . 20 ) of the contact pin ( 16 ) in the housing ( 2 ) and - pressing the two contact elements ( 18 . 20 ). Method according to 23, wherein the two contact elements ( 18 . 20 ) are used by different housing end faces ago.