DE2259358A1 - CONTACT TO PICK UP A CONTACT PIN - Google Patents

Description

PATENT LAWYERS

DIPL-ING-CURTWALLACH a Munich 2 ,: ■ / '**

DiPL.-ΐΝθ. Günther Koch kaufingerstrasse ₈

DR. TINO HAIBACH " _{phone ^ 5}

OUR MARK: 1 4 029

elco corporation 2259358

Willow Grove, Pennsylvania, V, St.A.

Contact to pick up a contact pin

The invention relates to devices for making electrical connections and in particular relates to such devices which are provided with contacts which are suitable for working together with several contact pins of square cross-section. A device according to the invention can be attached to the free end of a cable which contains several individual wire lines so that it is possible to _{connect the cable through a plug connection to a printed circuit or a circuit board or a plug with several K G} ntaktstifte of the type mentioned associate. Furthermore, a device according to the invention can be produced in one embodiment. len, which can be attached to the edge of a printed circuit board. or a circuit module in the form of a card in order to provide the card with a row or two rows of receiving contacts so that it can be plugged onto a larger circuit board with a printed circuit.

A typical receiving contact for a contact pin of the type mentioned "of square cross-section" is shown in FIG U.S.A. Patent Specification 3,363,224 describes “In such Contacts and connecting devices provided with them.

There are several Kachteile, which are listed below are:

1. With the known contacts, no measures have been taken that make it impossible to use the ivontakt pins in any other way than to be introduced in an axial seal. Since an oblique insertion of the contact pins can easily "damage the springy pinger of a pick-up contact could lead, the receiving contacts must be formed in an expensive manner so that overstressing is prevented and excessive displacement of the resilient fingers is avoided.

2. In the case of the known contacts, no measures are taken to limit the depth to which the Insert contact pins into them. It would therefore be possible to insert a contact pin into the associated receiving contact to be inserted so far that it protrudes from its rear end. However, this is undesirable because it involves the risk is that the protruding part of the contact pin in It comes into contact with neighboring contacts or other circuit elements, which can lead to short circuits, damage, etc. could lead.

5. Looking at such a well-known contact in the direction in which the contact pin is inserted, it has a closed box shape that is only through the natural strength of the curved sections of the material is maintained. Therefore the "box" spread easily, and the original accuracy of the final dimensions of the receiving contact could, during the Get lost in use. Furthermore, it is not possible to have this known receiving contact exactly with the desired final dimensions because its closed box shape prevents excess folding during manufacture, so that it is impossible to shape the contact in such a way that it springs back somewhat after it has been made to the to take on the desired final shape.

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4, In the embodiment of the "known receiving contact, which is intended to be connected to a wire by a crimping process and then inserted into an insulator to become, no action is taken to prevent the To anchor the contact in a cavity of the insulator housing, or to release the anchorage again to enable the contact to be removed from the housing.

5ο In the known receiving contact, the contact surfaces of the resilient fingers are near the rear end of the contact housing arranged, so that it is necessary, the associated contact pin very deep into the receiving contact to be introduced to ensure proper contact.

6. The resilient fingers of the known receiving contact ■ are bent parallel to the row formed by the contact pins, so that the accumulation of inaccuracies along a row of such contact pins leads to certain contact pins within a row not working perfectly with the resilient fingers , and that one resilient finger is often overstressed while the associated second resilient finger does not come into contact with the contact pin, _etc.

7 · Since the well-known receiving contact has the shape of a four-sided Box with a closed frame makes it difficult to find tools for the mass production of such contacts manufacture and completely plate the finished contacts »

The invention is based on the object of a connecting device to create 'which is suitable, with one or more free-standing contact pins of' square To work together cross-section, in which it is not possible to insert the contact pins at an angle, so. that the danger damage to the receiving contacts of the device is avoided, in which furthermore none of the contact pins

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the rear end of the associated receiving contact protrudes so that the i.ontaktstifte cannot come into contact with other contacts or electrical circuit elements, and that the occurrence of short circuits and damage is avoided, which can easily be produced by mass production while maintaining close tolerances , these tolerances being maintained during the entire service life of the receiving contact, in which the receiving contact can be easily anchored in an insulating housing in a reliable manner and removed again if necessary, in which each receiving contact has contact surfaces arranged near the front end of the insulating housing, so that a good contact is also ensured when the K _o n% aktstifte not be deeply inserted, wherein the bummierung inaccuracies along a series of corresponding contact pins is compensated without the contact pins between the resilient fingers of the AEU Take contacts take a wrong position in which each Aufnähmekontakt with the help of certain tools can be relatively easily made and plated, in which the resilient fingers of the receiving contacts have a greater length compared to known contacts, and in which it is possible to have a connecting device with two To create rows of receiving contacts into which the contact pins can be inserted with the application of a smaller force compared to known constructions.

The invention and advantageous details of the invention are described below with reference to schematic drawings explained in more detail using exemplary embodiments. It shows:

1 shows a receiving contact with a section for producing a crimped connection in a perspective view Depiction;

2 shows, in perspective, a receiving contact for a connecting device that can be attached to a printed circuit board a single series of contacts;

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Pigα 5 in a perspective partial representation the Anchoring device of a receiving contact for the lower row of a circuit board mountable connector having two rows of contacts;

Pig. 4 shows the anchoring of the receiving contact in a broken away perspective illustration after Pig. 1 in an insulating housing;

Pigo 5 on a smaller scale the front of the Arrangement according to Pig «4; ■

Pig. 6, partly in section and partly in a side view, the anchoring of a receiving contact according to Pig » 2 in an insulating housing;

Pig. 7 partly in the Schmitt and partly in one Side view of a connecting device attachable to a printed circuit board with two rows of receiving contacts;

Pig. 8 is a section along line 8-8 in Pig. 7; and

Pig. 9 in an exploded perspective Representation of a cable connection device with receiving contacts according to Pig. 1, which combined with into one assembly Contact pins work together.

In the following, four embodiments of receiving contacts according to the invention are described, firstly a contact with a section for producing a vertebral connection, secondly a contact for a connection device that can be attached to a printed circuit board with a single row of contacts, thirdly a contact for the lower row of contacts one to one Circuit board attachable connecting device with two rows of contacts and fourthly a contact for the upper row of contacts of a connecting _{device attachable to a circuit board o} Of course, one could numerous within the scope of the invention

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create further modified embodiments.

Fig. 1 shows a K ntakt provided with a section for producing a crimped connection, which is connected to a Wire is attached «The contact is formed so that the mentioned section is around the adjacent end of a wire can be crimped around which has been stripped of its insulation over a predetermined length; after this When connected to the wire, the i-ontakt can be inserted into a matching cavity of an insulating housing. When it is inserted, the contact is then automatically anchored inside the insulating housing. Should the contact e.g. because of damage, to change the circuit or the like are expanded, you have to use a special tool to loosen the contact.

To the contact after Pig. 1 includes a wire attachment portion 10, which can be tightly wrapped around the end of the wire to be connected, and a middle one Main section 12 for receiving a contact pin of square cross-section and for producing an electrical Connection to the contact pin and a front Veranlerungsabschnitt 14-, which is used to make the contact in releasably to anchor associated Kohlraum an insulating housing.

The wire attachment portion 10 includes two pairs of wire retaining tabs 16 and 18 of known type, the can be inserted together with the stripped end of a wire 20 in a crimping tool of the usual type. If this tool is operated, the tongues 16 around the insulation of the wire and the tongues 18 around the stripped The end of the wire is firmly wrapped around, as can be seen from FIG.

The main section 12 connects to the wire fastening section 1o with the mediation of a connecting section 22, that of the attachment portion

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is bent away outwards and becomes the middle rope of the Main portion 12 extends so that the wire 20 is coaxial with after attaching the wire to the contact the central axis of the main section is arranged, ^

The main section 12 includes a three-sided channel section which has been formed by holding a sheet metal blank accordingly. Two resilient fingers 24 and 26 have been knocked out of the two side walls of the E. The free end of each of these resilient pinger has a convex contact portion which is a similar convex contact portion of the respective other leather ends pinger opposite, so that 88 during insertion of a contact pin in Fig type shown 9 in ^the: between the resilient fingers, the convex sooner. Contact sections are spread apart and slide on the adjacent side surfaces of the contact pin in order to ensure good electrical contact. The sanders of the two contact fingers 24 and 26 are separated from the remaining parts of the main section 12, as can be seen in FIG. 1 at 28, so that the contact can easily be plated o In the absence of the gaps 28, the edges of the contact fingers were the respective edges of the main section be very closely adjacent and even touch these sanders near the base sections of the contact fingers, so that it would be very difficult to get an electroplating solution to reach all edges of the main section.

To produce the U-shaped main section 12, a part of a flat sheet metal blank along second parallel lines 30 and 32, each at a right angle bent over. Before bending, a considerable part of the material is drawn along each fold line in FIG 34 removed so that the fold lines are actually only along the end portions of the main section 12 extend. This reduces the force required to bend the blank, and at the same time reduces it

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the slope of the channel section after bending spring back. In the construction shown, the bending points can therefore be used in mass production generate a higher accuracy »

The contact of Fig. 1 is at its rear end near the attachment points of the resilient tinger 24 and 26 through a rear wall 36 reinforced, which is created by the fact that before the shaping of the channel section s an existing approach on one side of the channel section at a right angle bent over and with during the bending of the ■ duct section an interference fit in a slot 38 in the other side wall of the channel section is introduced. To introduce this To facilitate the rear wall 36, the slot 8 according to FIG. 1 is provided with an insertion section which tapers downwards. The front edge at the free end of the rear wall 36 is preferably in alignment with the outer surface the side wall of the channel section provided with the slot 38. The rear wall 36 of the main section 12 serves not only to reinforce the main section, but also to reinforce it at the same time it forms a stop which prevents the contact pin from being inserted so far into the receiving contact is that it protrudes from its rear end and in contact with other contacts or electrical circuit elements which, as mentioned, could lead to damage.

The anchoring portion 14 of the contact is through an extension at the front end of the central part of the Channel section is formed and has transverse slots 40 and 42, two curved fingers 44 and 46 and an end face Slot 48 open. When inserting the contact into the In the cavity of an insulating housing, fingers 44 and 46 are anchored to two shoulders as shown in FIG the inside of the cavity. Here, the slot 48 according to FIG. 4 takes a front guide extension 68 of the insulating Housing on, and the transverse slots 40 and 42 increase the flexibility of the anchoring section 14,

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2 shows a further embodiment of a receiving contact according to the invention with a main design 12 similar to that of the contact according to Pig. 1, in which, however, neither a y-anchoring section nor a wire-fastening section of the type shown on the basis of E ¹ Ig. 1 described type is available. Instead of these sections, a side wall of the anal section has an extension at each end, and these extensions are bent downwards as shown in FIG. 2 so that they form a front section 50 and a rear section 52. The front section 50 is not attached to the other side wall of the duct section or the central section of the duct profile, but is only held in its position as a self-supporting section. According to FIG. 2, the front section 50 has a square opening 54 which is provided with inwardly converging insertion sections so that the associated contact pin can be guided through the opening in the desired manner. There is also a retaining tongue 55 which can be guided through an opening in a circuit board and soldered to the circuit board.

The rear section 52 is formed by a shoulder of the rear reinforcement plate 36 and by the lower side wall of the channel section by the described press fit of this section in the slot. 38 and held in position according to FIG. 3 by a slot shown in the drawing which cooperates with the slot 38. In addition, the rear section 52 is provided with a holding tongue 55 ′ similar to the holding tongue 55 of the front section 50. ~ - ^/

The contact of FIG. 2 is intended for installation in an insulating housing 74 shown in FIG. 6, which has a single row of cavities for receiving one contact each having. Before the front section 50 according to Fig. 2 is bent down, the contact is introduced from the rear of the housing into the housing, whereupon the holding tongue 50 is bent downwards according to FIG. 6

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to anchor the contact in the housing. The so resulting connection device can be close to a printed circuit board, not shown, with a printed circuit their Kand be attached by the fact that the retaining tongues 55 and 55 'passed through openings in the circuit board and with printed conductors are soldered to the underside of the circuit board.

The contact according to FIG. 2 cannot be used in the lower fieihe of contacts for connecting a circuit board Use the serving device with an upper and a lower row of contacts as the rear section 52 lie on the outside of the insulating housing and would therefore abut the similar rear portion of the contact that has a corresponding in the top row Assumes position, as it is shown in Fig. 7 at 52 '. With this in mind, everyone points for the lower Row designated contact for a connector with two rows of contacts does not line up a rear section 52, rather, it has a rear wall similar to the rear wall 36 according to Flg. 1 provided. According to FIG. 3, however, there is an extension 56 on the rear part of the central section of the channel profile formed, the anchoring notch 58 and a curved The contact, modified according to FIG. 3, is intended to be inserted into the associated To be introduced cavity of an insulating housing from the front, the section 50 according to Flg. has already been bent down until the lead-in section 60 according to FIGS. 7 and 8 via an inner projection 80 in the cavity hinwe ^ .gleitet so that the anchoring notch 58 encloses the approach 80 to establish the contact.

4 and 5 show details of the insulating housing 64 and show the way in which the Contact of Fig. 1 anchored in the associated cavity 62 of the housing. Figure 9 shows on a smaller scale the complete housing 64, of which in Fig. 4 only

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a part drawn in a perspective, broken line Illustration is shown «, The. Kohlraum or the opening 62 extends between the front and rear of the housing 64 and is generally rectangular in shape Cross-section; however, according to Ilg. 4 an approach 66 available, which, according to FIG. 5, has three sections at right angles to one another, formed in the front part of the opening 62 and extends inwardly from the top wall of the opening and its side walls; further the already mentioned introduction approach 68 is available, the in the front cable of the opening 62 protrudes upwards from its bottom, -and finally there are in the bottom of the opening two recesses on both sides of the guide attachment 6ö and 71 are formed. The approach 66 and the Pührungsansatz delimit a generally square opening which serves to guide the contact pin 88 so that it engages the resilient contact fingers 24 and 26 in the correct manner cooperates. The front faces of the lugs 16 and 68 extend inwardly at an angle to the contact pin to insert into this square opening. The recesses 69 and 71 form shoulders on which the curved holding fingers 44 and 4-6 can anchor.

The contact according to FIG. 1 is inserted into the opening 62 of the rear of the housing © 64 · 'introduced. Moved here first the anchoring section 14 along the bottom of the opening 62. The contact is advanced until the Main section 12 enters the opening, whereupon according to FIG. 4 at the front corners of the side walls of the channel section existing bevels 72 cause a cam effect to the main portion 12 opposite the anchoring portion 14 down "so that the contact is slightly bent in the area of the web extending between the transverse slots 40 and 42.

If the contact is advanced further, the free ends of the holding fingers 44 and 46 slide over the bottom of the ' Opening 62, while the upper edges of the side walls of the

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Channel sections slide along the top wall of the opening. As soon as the contact has almost reached its foremost position, the holding fingers 44 and 46 spring into the depressions 69 and 71 so that the anchoring section 14 can again assume its original position relative to the main section 12-. The contact is in its final Once in place, further advancement of the contact is made through lugs or shoulders 66 and 68 prevented, but the contact can be pulled back out of the housing 64 after the retaining fingers 44 and 46 for example, have been disengaged from recesses 69 and 71 with the aid of a forked release tool.

i'lg. 6 shows the way in which the front Part of a contact according to FIG. 2 for a connecting device can be anchored with only one row of contacts in the associated insulating housing 74. Contact me is prior to bending under the front portion 50 of inserted into the housing from the rear. Once the rear section 52 to. Attachment to the rear of the iso-r When the housing comes in a shape similar to that of the front, the front section 50 is in the in Fig. 6 shown bent near the bottom to the contact set in the housing. The holding tongues 55 and 55 'are then inserted into openings in a printed circuit board, and the lower ends of the retaining tabs can be bent over and covered with printed conductors on the underside of the circuit board are lost in order to attach the entire connection device to the circuit board.

Fig. 7 shows a cross section of a connecting device attached to a printed circuit board 78 and having two rows of contacts, and Fig. 8 is a partial section along line 8-8 in Fig. 7 for a lower row of contacts Contact of the type partially shown in Fig. 3 is in one of the lower openings of the insulating housing arranged, while a designated for an upper height,

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himself now nocli not "described contact from one of the upper openings of the housing is added.

The contact intended for the top row has one Anchoring section 14, which has the same shape as the corresponding section of the contact according to FIG. 1, and it a main section 12 is present, the rear section 52 'of which corresponds to the rear section 52 of the contact 2, but has a greater length, so that the portion 52 'extends over the bottom of the insulating Housing also extends downwards so that the retaining tongue 55 'is guided through an opening in the circuit board 78 and with it a conductor 84 arranged on the underside of the plate can be soldered.

With each contact of the lower row, the anchorage notch 58 adjacent to the extension 56 according to FIG. 3 cooperates a beveled approach 80 together in the manner already described. The front retaining tongue 55 protrudes downwards through an opening in the circuit board 78 and is with a. . other conductor 82 soldered on the underside of the plate »

Before attaching to the circuit board 78, the Connection device assembled; for this purpose each contact of the lower row is inserted into the corresponding opening inserted from the front of the housing until the tab 56 snaps behind the tab 80, and any contact of the upper row is pushed into the associated opening from the rear of the housing until the anchoring fingers 44 and 46 spring into the recesses 69 and 71 (FIG. 4)

Since the resilient fingers 24 and 26 of each contact of the top row opposite the. springy fingers of all contacts the lower row are offset in the manner shown in FIG. 7, the contact pins 88 are required to be inserted only to apply a force which is considerably smaller than it would be the case if the resilient fingers of the

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bars of both rows stand in vertical illumination with one another. This is due to the fact that if according to Fig. 9, a plug 90 with two pins of contact pins 88 into the two-row connector according to Pig. 7 is inserted, the contact pins of the lower row first work together with the recording contacts of the lower row, spread the resilient fingers 24 by 26 and begin to move along the fingers, before the pins 88 of the top row engage the resilient fingers of the top row of receptacle contacts come. While the contact pins 88 of the lower row along the resilient fingers of the receiving contacts of the lower Move row, the contact pins of the upper row come to rest on the resilient fingers of the in a similar way Contacts of the top row, whereupon these fingers spread open and the contact pins 88 move further inward o Since the resilient fingers 24 and 26 within the two rows of contacts are not spread out at the same time, but one after the other, is reduced in size the force required to insert the contact pins, because the spreading of the resilient fingers requires greater force Force than the further movement of a contact pin between the resilient fingers after spreading.

9 shows, in perspective, a complete connecting or connecting device 64 for use in connection with a circuit board 90 or another component which has several free-standing, parallel contact pins of square cross-section be arranged in the central part of the plate, or it may be the contact pins an electrical circuit element, for example, act of a relay, a circuit unit having a certain function, etc. _e. The connecting device 64 has two rows of receiving contacts, which are formed in the manner shown in FIG.

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Should one of the receptacle contacts of the device 64-damaged this contact can easily be replaced by a new contact. To this end becomes a contact removal tool with two protruding fingers according to Pig. 4- under the curved anchoring fingers 44 and 46 pushed to lift the anchoring section 14- and so the anchoring fingers out of engagement with the Bring wells 69 and 71. Once that is done is, the contact can be pulled out of the rear end of the device 64- with the aid of the associated wire line. Then the defective contact is separated from the wire line and replaced by a new contact, the then inserted into the device.

A similar procedure can be used to disengage the contact of Figure 3 from the insulating housing bring to. The contact according to Fig. 2 is released, by bending the front portion 50 straight, whereupon the contact from the rear end of the insulating housing pull out.

According to the above description are in the invention Contacts and connection devices the mentioned disadvantages of the contacts and connection devices known up to now avoided; Firstly, it is impossible to insert the contact pins at an angle into the receiving contacts, so that there is no risk of damage to the receiving contact consists; secondly, a contact pin cannot be passed completely through the receiving contact, so that it protrudes from the rear end of the connection device, where it can damage circuit parts could; third, the receiving contact has only three wall sections, so that the side walls can be bent over to a slight excess extent to effect that the side walls spring back a little to achieve the desired take final position, and the final position of the side walls is secured by the press fit between the reinforcement rear wall 36 and the slot

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is present so that the resilient linger 24 and 26 occupy exactly the correct lape, and that the risk of deformation of the jj'inger by the forces occurring when inserting the contact pin is avoided; fourthly, contact can be made according to i'ig. 1 lightly anchored in the associated opening of the insulating housing and remove again if necessary; fifth, the contact surfaces of the resilient fingers are arranged near the front of the insulating housing, so that the contact pin does not have to be completely inserted into the housing in order to ensure good contact; Sixthly, the resilient i.ontaktfinger be bent at a right angle to the through the respective series of K _o ntaktstiften formed plane, so that inaccuracies that add up along the-Keihe of contact pins only cause that the contact pins against the contact fingers in shift laterally so that the contact fingers are not damaged, as it could happen if the contact fingers were arranged so that they are bent in a parallel to the row of contact pins sighting; Seventh, the use of a duct section not only of three vandab sections facilitates both the mass production of such contacts and plating

Claims: 309833/0763

Claims (1)

A ϊϊ S P E ti "CHE / Contact for receiving a matching contact pin of square cross-section, characterized in that the contact is made from a sheet metal blank which has been folded along two parallel lines (30, 32) separated by a distance so that it has a three-sided channel section with a forming open side and at its viewing from one end of ■ u-anal from s cut out parallel to the fold lines a cross-section has generally U-shaped, that, of the mutually gegegüber lying side walls of the channel section at corresponding points $ e, a resilient finger ( 24, -26) protrudes inwards, that the free end of each of the resilient fingers has a convex surface which faces the corresponding convex surface of the finger opposite the finger in question, that an end section (36) at one end of one of the two faces one another opposite side walls of the channel section along a third fold line at a right angle the parallel fold lines is bent inwardly, and that this end portion is installed with a press fit in a slot (38) which is formed in the other side wall of the channel portion opposite the third fold line, so that the contact is reinforced by the end portion, and that the contact is provided with devices (14, 16, 18) which serve to anchor the contact in an opening of an insulating housing and to establish an electrical connection to an electrical conductor (20) » 2ο contact according to claim 1, characterized in that the device for anchoring the Contact in an opening of an insulating housing an extension (14) of the Iviittel from the section of the channel section 309833/0763 belongs, which connects to one end of the channel section and extends generally in the plane of the middle section, and that the extension means (4-4 ·, 46) which serve to anchor the contact on a shoulder in an opening of an insulating housing so that when inserting the contact into the opening; the extension slides over the shoulder to make it the Device to automatically anchor to the shoulder. 3 »Contact according to claim 2, characterized in that the one present on the extension (14) Device comprises fingers (44-, 46) which are shaped so as to that when the contact is inserted into the opening of the slide the insulating housing over the loden of the opening, until they are in two associated depressions (69, 7Ό spring into the bottom of the opening. 4o Lontakt according to claim 1, characterized in that the device for anchoring the Contact in an opening of an insulating housing has an elongated extension (50, bi?), Which adjoins one of the two opposite side walls of the channel section, so that it is possible that the After inserting the contact into the opening to bend the extension so that the contact is prevented from to move with respect to the insulating housing in a certain direction, and that the free end of the extension can be introduced into an opening of a circuit board with a printed circuit to make the contact on the circuit board (78) to be attached and a "connection to an electrical conductor (82, 84) to be established on the circuit board" 5o contact according to claim 4, characterized in that the contact has two elongated extensions (50, 52), which are attached to the associated ends of one of the two opposite ends ΊΙΙ. Connect the side walls of the duct section so that it 309833/0 763 is possible, any delay after the introduction of the contact to bend into an opening of an insulating housing in such a way that that movements of the contact with respect to the insulating housing in two opposite directions be prevented,, 6. Xontakt according to claim 1, characterized in that all edges of each resilient finger (24, 26) are separated by distances from all other parts of the contact, so that all parts of the contact including the edges of the springy fingers in one have electroplating bath plating » 7ο contact according to claim 1, characterized in that the sheet metal blank "along each of the two parallel split lines (30, 32) an opening (34) has, and that each of these openings over the main r part of the length of the channel section extends and in one Distance from both ends of the duct section ends " 8ο contact according to claim 1, characterized in that the contact has an insulating housing (64) is assigned, which has an opening (62) which extends from one surface of the housing to one of the latter The surface facing away from the surface extends that the contact in the Opening is arranged, and that a part of the opening which is adjacent to the first-mentioned surface has a tapering Introductory portion is provided, which at 'the first-mentioned surface has an enlarged mouth which tapers to a narrower passage, which from the first mentioned area is separated by a distance. 9 «Contact according to claim 8, characterized in that the insulating housing (64) at least two contacts', which are arranged in two associated openings of the housing, and that the one contact so is arranged that the distance between its resilient l'ingern (24, 26) and the first-mentioned surface of the 309 83 3/0 763 «20 * Housing of the corresponding distance between ätn f # « changing fingers of the other contact and & ®r gleioh ^ n area differs, so that for £ infiihr # n & w # | © j? Contact* pins (88) in the two contacts requires a force which is smaller than the i'all i © in WÜrdi, w © nn the two distances would be equal to each other 10. Contact according to claim 8, characterized in that the device for connecting the contact in an insulating housing (64) includes a length (14) of the central section of the channel section which is generally located at one end of the channel section the plane of the middle section adjoins that the extension has two fingers (44, 46) ^: that a wall of the opening of the insulating housing has two corresponding © recesses (69, 71), which are separated by such a distance that it the It is only possible to anchor behind the shoulders of the depressions so that the part of the opening adjacent to the depressions whitens a shoulder (66) which protrudes inward from several walls of the opening, as well as a shoulder (68), which is formed between the depressions 9-R of the relevant wall of the opening, and that the shoulder and the attachment jointly delimit a small diameter through which a contact pin (88) extends along the length s guided along the central axis of the contact p - 309833/0763