WO1990014702A1

WO1990014702A1 - Selective shorting of plug pins/socket contacts in an electrical connector

Info

Publication number: WO1990014702A1
Application number: PCT/GB1990/000808
Authority: WO
Inventors: Roy Edward Weston
Original assignee: Cinch Connectors Limited
Priority date: 1989-05-24
Filing date: 1990-05-23
Publication date: 1990-11-29
Also published as: US5061196A; GB2233164A; GB8911900D0

Abstract

A shorting link is provided having legs adapted to interlock with contacts of an electrical connector. The contacts may be connected by the link to ground, or one or more of the link-connected contacts may also engage conductors in an electrical circuit. In one link embodiment the link legs may comprise contacts housed in aconnector insulator for engaging mating contacts of a mating connector.

Description

Selective Shorting of Plug Pins/Socket

Contacts in an Electrical Connector

The present invention relates to a method and device for shorting together selected plug pins and/or socket contacts of an electrical connector while leaving the other plug pins/socket contacts free for connection to other leads.

During manufacture or assembly of an electrical connector it is often necessary to short together two or more of the pins (if it is a plug) or contacts (if it is a socket), for example so that they may be attached to an earth lead via a single connection. Conventionally, this is done for example by soldering a lead to the rear end of each plug pin or socket contact which is to be shorted and then soldering together the leads. This method is

laborious and the resulting network of junctions at the rear of the insulating connector body can obstruct the connections of other leads to the individual unshorted plug pins or socket contacts. The present invention provides a shorting link for selectively shorting together plug pins and/or socket contacts which assemble into the insulating body

of an electrical connector.

The shorting link of the present invention is a flat blank of conductive material comprising a plurality of legs formed on a connecting portion. In certain embodiments of the invention the rear ends of the plug pins or socket contacts to be shorted are formed for crimping engagement to respective legs of the shorting link while it is flat and then the legs are bent relative to the connecting portion so that the plug pins or socket contacts are in the correct attitude for introduction into the insulating connector body.

The shorting link of this invention is readily assembled with contacts of known construction, such as contacts employed in solderless termination systems including systems employing insulation-displacing

contacts, as will hereinafter be described in greater detail.

In yet other embodiments of the invention the legs of the shorting link themselves form plug pins or socket contacts of the electrical connector. In these cases the shorting link need not be made as a flat blank but could be formed in a bent shape suitable for inserting the legs into the insulating connector body.

Features and advantages of the present invention will become clear from the following description of an embodiment thereof, given by way of example, illustrated by the accompanying drawings in which: Figure 1 shows an electrical connector

incorporating a shorting link according to the present invention;

Figure 1(a) is a top plan view,

Figure 1(b) is a front elevational view,

Figure 1(c) is a rear elevational view, and

Figure 1(d) is a left side elevational view partially cut away;

Figure 2 shows as a blank the shorting link of Figure 1;

Figure 2(a) is a front elevational view,

Figure 2(b) is a left side elevational view, and

Figure 3 shows a pin contact of Figure 1;

Figure 3(a) is a top plan view,

Figure 3(b) is a section along line A-A' of Figure 3(a), and Figure 3(c) is a section along line B-B' of Figure 3(a);

Figure 4 is a view similar to Figure 3(a) of a female contact adapted to engage a shorting link in the manner of the pin contact of Figure 3(a);

Figure 5 is a view similar to Fig. 2(a) in which the link legs comprise pin contacts;

Figure 6 is a perspective sectional view, partially cut away, of an electrical connector having insulation displacement contacts housed therein,

illustrated in engagement with a shorting link of this invention; Figures 7 and 8 are plan views of shorting links similar to that of Figure 2 as initially formed from a continuous strip and prior to bending the link legs into the condition of the shorting link illustrated in Figure 10;

Figure 9 is a fragmentary side elevational view of an insulation displacement contact, partially broken away in assembly with a leg of a shorting link of this invention;

Figure 10 is a fragmentary perspective view of a link similar to that of Figure 9 following bending for engagement with insulation-displacement contacts to be housed in the insulator of Figure 6;

Figure 11 is a transverse sectional view of a shorting link-contact assembly with a conductor of a wire terminated in the contact, and

Figure 12 is a view similar to Figure 5 in which the link legs comprise female receptacle contacts.

Figure 1 shows a multi-way (15 pin) D-type electrical connector plug incorporating a shorting link according to the present invention, with the unshorted plug pins omitted for greater clarity. Two staggered rows of plug pins 1 are mounted in an insulating body 2 made of moulded plastics material. In this example the insulating body 2 is a two-part moulding with a rear, open-fronted moulding 2a in which the plug pins 1 are mounted and a front moulding 2b through which the tips of the plug pins protrude. A shorting link 10 is connected to the rear of each plug pin to be shorted together by a respective leg 11 passing into a hole 3 in the rear moulding 2a of the insulating body 2. Central portion 12 of the shorting link 10 extends along the rear of the insulating body 2 and is provided with an upstanding tab 14 at one end thereof for connection to an earth lead or the like.

The shorting link 10 is spaced from the

insulating body 2 so that if the tab 14 is soldered to a lead, or any of the legs 11 are soldered to plug pins, or socket contact the heat will not be directly conducted to the moulding; thus melting of the moulding is prevented.

A two-part metal case 6 encloses the insulating connector body 2 to promote mating of the connector plug with a corresponding socket. The two halves of case 6 are held together in a conventional manner, e.g. eyeleted or riveted together.

Figure 2 shows the shorting link 10 of Figure 1 as a flat blank, i.e. before connection to the plug pins 1. The number, spacing and staggering of the legs 11, and the width of the central portion 12, are specifically designed to match the characteristics of the connector plug of Figure 1. Clearly, these factors may all be varied so as to produce shorting links for connectors of different types, and in particular to accommodate a single row of plug pins (or socket contacts), non-staggered parallel rows of plug pins/socket contacts, non-parallel rows of plug pins/socket contacts, and different numbers and/or pitches of plug pins/socket contacts. Shorting links according to the present invention may be made for circular plugs. One embodiment of such a shorting link has a "starfish" shape, i.e. with a circular or ring- shaped central portion and legs extending radially.

Each leg 11 of the shorting link 10 corresponds to the position of a plug pin to be shorted, in this case pins 2,3,4,5,8,9,10,11,12,13 and 15. Semi-circles of material are cut out from the shorting link 10 at

locations 15 corresponding to plug pins which are not to be shorted, in this case pins 1, 6, 7 and 14. The shape of the cut-outs 15 is adapted to match the contours of the holes 3 in the rear of the connector insulating body 2 so that the shorting link 10 will not unduly obstruct the connections of leads to the rear of unshorted plug pins.

The shorting link 10 may be made from a range of conductive materials, e.g. plated and unplated metals, plated plastics. Brass is a convenient material to work with because it is easily formed, resilient, relatively cheap and a good conductor. The manufacturing process depends on the conductive material used for the shorting link: for a metal such as brass the shorting link may be made in a stamping press, for a plated plastics shorting link plastics material may be first moulded and then metallized.

For a given type of electrical connector the shorting link 10 may be manufactured with a full set of legs 11 so that the users may determine which plug

pins/socket contacts are to be shorted together and remove the unwanted legs 11 themselves. Alternatively customized shorting links 10 may be manufactured which already have cut-outs 15 at the desired locations. The legs of the shorting link 10 shown in Figure 2 are in the form of flat blades with a section of reduced width at the end thereof remote from the central portion 12. This reduced width section is used to promote the attachment of plug pins/socket contacts by crimping. The connection of plug pins 1 to the legs 11 will now be described with reference to Figure 3 which shows a pin contact designed for attachment to a lead by crimping. It is to be understood that the plug pins could be attached to the shorting link legs 11 by other methods, e.g. by soldering.

The pin contact 1 of Figure 3 has a first crimp portion 21 and a second crimp portion 22 at the rear end thereof. As shown in Figures 3(a) and (b) the first crimp portion 21 is preferably already crimped before the pin 1 is attached to the shorting link 10, while, as shown in Figures 3(a) and 3(c), the second crimp portion 22 is not crimped before attachment. The partially crimped rear end of the pin contact l is slid over the free end of a leg 11 of the shorting link so that the first crimp portion 21 makes a tight fit over the leg section of normal width and the second crimp portion 22 encircles the leg section of reduced width. The second crimp portion 22 is then

crimped so as to prevent sideways movement of the leg 11 relative to the attached pin contact 1.

The pin contact 1 could be presented to the shorting link leg 11 in an uncrimped form rather than partially crimped as described above, however when the electrical connector involved has a narrow pitch between plug pins/socket contacts the space available for

manoeuvre of a crimp tool is limited and it is preferable to use the partially formed crimp. Connection of socket contacts to the legs 11 of the shorting link may be made in a similar way.

Once the selected plug pins/socket contacts have been attached to the appropriate legs 11 of the shorting link 10 the legs 11 are bent relative to the central portion 12, in this case to an angle of 90), so that the plug pins/socket contacts are correctly aligned for insertion into the rear of the rear moulding 2a of the insulating connector body 2. The legs 11 of the shorting link 10 of Figure 2 are necked where they meet the central portion 12 so as to facilitate bending. When the shorted plug pins/socket contacts are inserted in the insulating connector body they are fixed in place, in this example fixing is achieved by means of a shoulder 23 provided on each plug pin/socket contact and a plurality of split collars (resembling cells of a beehive) provided inside the rear moulding 2a, each split collar aligned with a respective hole 3 in the rear moulding. On insertion of a plug/socket contact into a hole 3 in the rear moulding 2a the shoulder 23 forces apart the two halves of the

respective collar until it has passed through and the collar halves snap back. The collar subsequently prevents the shoulder 23, and therefore the plug pin/socket

contact, from moving backwards relative to the rear moulding 2a. Other conventional fixing methods could alternatively be used.

The other plug pins/socket contacts may now be attached (e.g. crimped or soldered) to their respective leads, inserted from the rear into the appropriate

locations in the insulating connector body and fixed into place. When all of the plug pins/socket contacts have been mounted in the rear moulding then the front moulding 2b may be fitted over the plug pin tips (or free ends of the socket contacts) to prevent further forward motion thereof relative to the rear moulding 2a.

Figure 5 is a plan view of a shorting link 24 in which the legs thereof comprise male contacts 26 similar to male contacts 1 of Figures 1 and 2. Collars 23A of the leg-contacts of Figure 5 function similarly to collars 23 of the contacts 1 described above.

Figure 12 is a fragmentary view illustrating a link-contact arrangement 30 in which the link legs

comprise female contacts 28 adapted to receive a male pin blade or the like. Collar portions 23B of contacts 28 also function similarly to collars 23 of contacts 1. It will be noted that the female contacts 28 are similar to the female contact 4 illustrated in Figure 5 with the exception that the collars adapted to engage a link leg are absent inasmuch as the same are unneeded.

The integral link-contact structures of Figures 5 and 12 dispense with the need for any link-contact engagement such as above described when separate links are employed for interfitting engagement with existing

contacts. It will be noted by comparing Figures 5 and 12 that in Figure 5 the link-contact arrangement is stamped from a conductive sheet and specific link legs may be omitted in the stamping operation so as to satisfy the shorting requirements of the connector in which the link is to be disposed.

In the shorting link-contact 30 of Figure 12 the female contacts extend from a link carrier strip portion 32 from which the individual leg-contacts may be readily broken free in accordance with the shorting requirements of the connector with which the link 30 is to be employed. Thus, Figure 10 illustrates formed link 22M in which a center top leg has been removed at junction 33 from central carrier portion 32,

Figure 6 is a perspective view partially in section of an electrical connector 34 adapted to house a plurality of contacts 36 illustrated not only in Figure 6 but also fragroentarily illustrated in Figures 9, 10 and 11. The illustrated connector housing and contact

assembly defines a solderless termination system of the type disclosed in McKee U.S. Patent 4,035,049; the

disclosure of such patent is incorporated herein by reference. The contacts 36 of Figures 6, 9, 10 and 11 are adapted not only to effect desired electrical contact with a wire central conductor 38 (see Figure 11) surrounded by insulation 40, but in addition the contacts 36 are readily engageable in a fixed relationship with legs 42 projecting from one side of carrier strip 32 as illustrated in Figure 7 or from both sides of a carrier strip 32 as illustrated in Figure 8. Shorting link 50 of Figure 7 may have the legs 42 thereof pressed downwardly into slots 54 formed in the insulator of connector 34 until the legs 42 bottom on base portions of the contacts 36. It will be most

apparent from the sectional view of Figure 11 at a

shorting link leg 42 is securely received between opposed insulation rupturing tabs 58 so as to deform opposed edge portions of each shorting link leg 42 engaged by each pair of insulation rupturing jaws 58. it is apparent from Figure 11 that after a shorting link leg 42 is bottomed on the base of the illustrated contact 36 and the base of the insulator slot in which the contact is disposed a wire may be readily terminated between the opposed jaws 58 which readily cut through the surrounding insulation 40 in the course of effecting desired contact with the metallic core 38.

It will be noted form Figure 10 and particularly from the lower contact 36 illustrated in the inverted positions that in the insulation displacement contact type illustrated there may be no contact floor between the opposed rupturing jaws 58. Accordingly as illustrated in Figure ll the shorting link may partially bottom on the insulator floor portion of the slot in which the contact 36 is disposed,

It is also evident from Figure 10 as well as Figure 6 that each contact 36 possesses two pairs of spaced insulation rupturing jaws 58 so that the conductor such as illustrated conductor 38 of Figure 11 may be engaged twice by each contact 36. However, it is only necessary that the jaw pair 58 disposed closer to the open end of each insulator slot 54 as illustrated in Figure 6 engage the shorting link legs.

The remaining contact structure such as locking tabs 58 which are adapted to be bent for interlocking with the insulator in which the contact is disposed is known to the art. Other known components of the illustrated

contacts 36 are rear tabs 60 which prevent upward

disengagement of a wire or wires after termination between the insulation rupturing jaws 58 of each contact and contact blades 61.

It is apparent from Figure ll that as each leg 42 is deformed in the course of insertion between the opposed contact jaws 58 such leg and the shorting link as a whole is securely retained to the contacts and connector regardless of whether wires comprising a core and

surrounding insulation as illustrated in Figure 11 are subsequently inserted into the contact.

Thus the provided shorting links may

interconnect contacts having no conductors or leads attached thereto, with the link connected to ground as by means of a grounding tab 14 illustrated in Figure 1 of the drawing. Contacts such as the insulation displacement contacts 36 of the drawing may be connected to a shorting link only and the contacts and link securely retained in assembled position by virtue of the deformation of the link legs in the manner illustrated in Figure ll of the drawing, or, one or more of the contacts joined by the link may be in electrical communication with conductors of a circuit.

It is believed apparent that the specific form of the contacts, connector and shorting link may be varied without departing from the ambit of the invention above disclosed. The illustrated contacts 36 being presented by way of example only interlock with the insulation

rupturing jaws 58 of contact 346 of the drawing as the width of the link legs are preferably approximately .002 to .004 inch greater in width than the interval between the jaws 58. The particular link configuration prior to bending may be stamped in a continuous process from a continuous strip of conductive material, in which the main link section from which the link legs extend comprises a carrier strip segment.

Claims

CLAIMS :

1. An electrical connector comprising:

an insulating body having a plurality of apertures corresponding to the positions of the contacts of the electrical connector;

a shorting link of conductive material

comprising a main section and a plurality of legs

extending from, and being an integral part of the main section;

with each one of said plurality of legs

extending into a respective one of said plurality of apertures and effecting electrical contact via the legs and main section of the shorting link between selected contacts.

2. A connector according to claim 1 wherein the selected contacts are separate from the legs and are attached to the legs prior to insertion into the

insulating body.

3. A connector according to claim 1 wherein the selected contacts are separate from the legs and are attached to the legs after insertion into the insulating body,

4. A connector according to claim 1 wherein the selected contacts are formed as an integral part of the legs.

5. A connector according to claim 1, 2, 3 or 4 wherein the main section of the shorting link further comprises a tab to enable a further electrical connection to be made to the shorting link.

6. A connector according to any previous claim, wherein the connector is a multi-way D-type connector.

7. A unitary contact arrangement for insertion in a connector housing comprising an integral conductive member having spaced contacts joined by a common shorting section.

8. The electrical connector of claim 1 in which said shorting link engages contacts connected to ground only.

9. The electrical connector of claim 1 in which said shorting link engages at least one contact in

communication with an electrical conductor.

10. The unitary contact arrangement of claim 7, in which said contacts are connected to ground.

11. The unitary contact arrangement of claim 7, in which at least one of said contacts engages an

electrical conductor.

12. A method for shorting contacts of a

connector insulator by means of a shorting link having spaced legs joined by a main link reaction, comprising the steps of interlocking the legs of such shorting link with selected ones of such contacts, and connecting such shorting link main section to ground.

13.The method of claim 12, in which said contacts are mounted in said insulator prior to engaging said shorting link legs.

14 . The method of claim 12,in which said contacts interlock with the shorting link legs after mounting said contacts in said insulator.

15. A method of shorting contacts mounted in a connector insulator by means of a shorting link having spaced legs joined by a main link section comprising the steps of interlocking the legs of said link with certain of said contacts and terminating a conductor of an electrical circuit in at least one said certain contacts.