US3564487A - Contact member for electrical connector - Google Patents

Contact member for electrical connector Download PDF

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Publication number
US3564487A
US3564487A US3564487DA US3564487A US 3564487 A US3564487 A US 3564487A US 3564487D A US3564487D A US 3564487DA US 3564487 A US3564487 A US 3564487A
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United States
Prior art keywords
spring
fingers
contact
material
member
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Expired - Lifetime
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Harlan R Upstone
Bruce K Arnold
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ITT Corp
ITT
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ITT
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Assigned to ITT CORPORATION reassignment ITT CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION
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Application status is Expired - Lifetime legal-status Critical

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02Contact members
    • H01R13/10Sockets for co-operation with pins or blades
    • H01R13/11Resilient sockets
    • H01R13/111Resilient sockets co-operating with pins having a circular transverse section

Abstract

THE DISCLOSURE RELATES TO A SOCKET CONTACT FOR AN ELECTRICAL CONNECTOR HAVING AN ELONGATED CONTACT BODY WITH REARWARDLY TERMINATING MEANS AND HAVING A TUBULAR FORWARD PORTION. THE TUBULAR FORWARD PORTION CONTAINING A FORWARD OPENING LONGITUDINAL SLOT THEREIN HAS SPRING CONTACT FINGERS HAVING THEIR ROOTS AT THE REAR END OF THE SLOT. A SLEEVE IS PROVIDED ABOVE SAID FINGERS AND SECURED PROXIMATE THEIR ROOTS THEREOF. THE TERMINATING MEANS, THE

SPRING FINGERS, AND THE SLEEVE MEANS ARE EACH MADE OF MATERIAL WHICH PROVIDES THE DESIRED PERFORMANCE PARAMETER OF THAT PARTICULAR COMPONENT. FOR EXAMPLE, THE SPRING FINGERS UTILIZE MATERIAL WHICH HAS GOOD SPRING CHARACTERISTICS AS WELL AS MAXIMUM CONDUCTIVITY. THE TERMINATING MEANS MAY BE FORMED OF A MATERIAL WHICH IS READILY CRIMPABLE.

Description

Feb. 16, 1971 H. R. UPSTONE ETAL 3,564,487

CONTACT MEMBER FOR ELECTRICAL CONNECTOR Filed Feb. 1969 /0 l Z z L64 4 42 E /6 Z [X M .Y.. A, Q 55 30 3Q 62 44 J O PM. 1 W A) HA em/v 2 UPS 70M; 55066 x: AKA/04D INVENTOR5v A from/6V United States Patent O 3,564,487 CONTACT MEMBER FOR ELECTRICAL CONNECTOR Harlan R. Upstone, Arcadia, and Bruce K. Arnold, Pasadena, Califi, assignors to International Telephone and Telegraph Corporation, New York, N.Y., a corporation of Delaware Filed Feb. 3, 1969, Ser. No. 796,083 Int. Cl. H01r 11/08, 11/22 US. Cl. 339-258 3 Claims ABSTRACT OF THE DISCLOSURE The disclosure relates to a socket contact for an electrical connector having an elongated contact body with rearwardly terminating means and having a tubular forward portion. The tubular forward portion containing a forward opening longitudinal slot therein has spring contact fingers having their roots at the rear end of the slot. A sleeve is provided above said fingers and secured prxi mate their roots thereof. The terminating means, the spring fingers, and the sleeve means are each made of material which provides the desired performance parameter of that particular component. For example, the spring fingers utilize material which has good spring characteristics as well as maximum conductivity. The terminating means may be formed of a material which is readily crimpable.

The invention relates in general to contact members for electrical connectors, and more particularly, to a socket contact having a terminal member, a spring member, and a tubular sleeve each made of materials which best matches the performance parameters needed for the particular component.

BACKGROUND OF THE INVENTION In United States Pat. No. 3,286,222 there is described an electrical contact member having forwardly ertending spring fingers which flex laterally upon mating with an opposed contact member. The spring fingers are prestressed in their positions of repose in a direction opposite to the direction of stressing encountered in service. By so prestressing the spring fingers, the contact material spring characteristics are increased proximate the roots of the spring fingers and thereby increase the spring force exerted by the fingers on the mating contact member. Moreover, the amount of flexing which the spring fingers are capable of withstanding in operation or during deep probing is increased without exceeding the elastic limits and thereby causing permanent damage to the fingers.

The prime purpose of prestressing the spring fingers in the above identified patent is to overcome the inherent disadvantages of having the spring fingers in a cantilever arrangement projecting free from a tubular base which results in maximum pin stress from outward flexing by a mating pin being applied proximate the root of the spring fingers. This results in relatively weak contacting force between the socket fingers and the mating pins, much less than the actual spring capability of the spring fin ers along their length.

Further, the fact that the pin stress was at a maximum proximate the roots of the spring fingers had the further disadvantage that when the fingers were flexed outwardly by a mating pin contact, the elastic limits or yield strength of the material were often approached; and when a test probe was inserted in the socket contact without proper care, there was a possibility that the elastic limits or yield strength of the material would be exceeded and 'ice the fingers would take a permanent set and thereby lose most of their spring capability.

While the foregoing technique of prestressing the spring fingers has been successful, certain compromises of materials and finishes of the main body and spring fingers have become readily apparent as the need for very small contact configurations has increased in demand. Ideally, the engaging end of a typical socket contact utilized spring fingers and necessitated the use of a material which has good spring characteristics. Conversely, the terminal end part is a crimp-type contact requiring a material which is highly ductile using a minimum of springback. Moreover, in conventional contact configurations, it is difiicult to achieve uniform deposition of the electro-plated precious metal finishes which may be required. This problem is more apparent when trying to plate deep, semi-blind bores in small contacts having very small bore diameters.

In order to overcome the attendant disadvantages of the prior art of electrical connectors having a socket utilizing spring fingers, the present invention allows selection of the material and finish for each segment of the connector which best matches the performance parameters of that particular component. Moreover, by using multi-piece construction for the contact body, it is possible to utilize material forms and manufacturing processes better suited to fabrication than those presently employed. Further, by handling and finishing the components of the connector as separate pieces prior to assembly, the problems attendant to finishing conventional socket connectors are greatly reduced.

SUMMARY OF THE INVENTION More particularly, the invention comprises a socket contact for an electrical connector having an elongated contact body with rearwardly terminating means and having a tubular forward portion. The tubular forward portion containing a forwardly-opening longitudinal slot therein contains spring contact fingers having their roots at the rear end of the slot. Sleeve means are provided above said fingers and secured proximate their roots. The terminatin means, the spring fingers, and the sleeve means are each made of a metal which provides the desired performance parameters of the particular component.

The advantages of this invention both as to its construction and mode of operation will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings in which like reference numerals designate like parts throughout the figures.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an axial section, partly in elevation, illustrating the socket contact member of the prior art with a mating pin contact member positioned for insertion into the socket;

FIG. 2 depicts an axial section, partly in elevation, illustrating the socket contact member according to the present invention; and

FIG. 3 shows an alternative arrangement for terminating the contact member of FIGS. 1 and 2.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings, there is shown in FIG. 1 a prior art socket contact member 10 which is shown axially in spaced relationship with a mating pin contact member 12 which is adapted to be forcibly inserted into the forward end of the socket to complete an electrical circuit.

The socket contact includes an elongated body 14 having a front end 16 and a rear end 18. The forward engaging contact portion 20 of the socket contact member 10 is of tubular construction having a forward opening bore 22 with a bevelled entrance ramp 24. The tubular engaging portion is slotted longitudinally down the middle by a slot 26 which extends to the front end 16 and to a rearward end 28 of the slot so as to divide the engaging portion of the socket into a pair of diametrically opposed spring fingers or legs 30. These are pinched together to reduce the diameter of the entrance of the tube so that when the pin contact member 12 is inserted, it will flex the fingers 30 outwardly and the fingers will exert a spring contacting force against the pin. The rear end 28 of the slot is disposed forward of the rear end 31 of bore 22.

Circumferentially engaged about the tubular forward portion 20 is a sleeve 32. A rear end 34 of the sleeve 32 is disposed to the rear end of the slot 28 and is positioned against a forwardly facing shoulder 36 on the body. The sleeve 32 extends forwardly beyond the slot end of the contact body and has an in-turned forward lip 38 which provides a rigid guide for the mating pin 12.

The contact body 14 has a tubular rearward terminating portion 40 adapted to receive a bared end of a wire 42 which is crimped therein. A mounting collar 44 is formed on the contact portion 14. The rearward portion of the sleeve 32 is tightly engaged over the annular portion of the socket tube immediately to the rear of the slot and against the contacting fingers approximate their roots, i.e. immediately adjacent to and extending somewhat forwardly of the rear end of the slot. The circumscribed part of the socket tube is placed in hoop compression and the root portions of the spring contacting fingers are radially inwardly stressed substantially to the point of elastic limit.

The efiect of the prestressing by compression sleeve 32 is to greatly increase the spring characteristics of the contact material of the critical region proximate and adjacent to the spring fingers. With prestressing substantially to the elastic limit the spring characteristics are substantially doubled, which substantially doubles the spring force of the contact fingers against the mating pin contacting member. Further, when the spring fingers are flexed outwardly by a mating pin contact or by a test probe they will not approach their yield strength or elastic limit nearly so closely as they would if it were not for the prestressing of the compression sleeve 32.

Normally, the outer sleeve is made typically of a stainless steel or copper alloy. The socket body 14 is made of a suitable conductive alloy such as nickel-copper which allows the fingers 30 to be springable while simultaneously allowing the terminating portion to be crimped to the wire conductor 42. Thus, as can be readily seen, the tubular body 14 is a compromise between the spring characteristics and the crimp characteristics needed to provide the desired electrical contact.

Referring now to FIG. 2, there is shown a preferred embodiment of the invention wherein a socket contact member 100 is made of three portions for mating with a pin contact member 112. The socket contact 100 comprises a terminating member 113 having a tubular rearward terminating portion 114 attached to receive a bared end of a wire connector 116 which is crimped therein. A mounting collar 118 is formed forward of the terminating portion 114. A reduced diameter cylindrical member 122 is formed forwardly extending from the collar 118.

A spring member 130 is formed of a bore 132 and a bevelled entrance ramp 134 at its forward end. The spring member 130 is slotted longitudinally down the middle by a slot 136 which extends from the front end of the member 130 at the bevelled entrance ramp to a rearward end 138 of the slot so as to divide the engaging portion of the spring member into a pair of diametrically opposed spring fingers 142. It should be understood, of course, that the number of fingers used is merely a matter of design. The spring fingers 142 are pinched together as in the device of FIG. 1 to reduce the diameter at the entrance, so that when the pin contact member 112 is inserted it will flex the fingers 142 outwardly and the fingers will exert a spring contacting force against the pins. The rear end of the spring member is slipped over the reduced diameter cylindrical member 122 and its rear end 144 abuts the forward face of the collar 118. Circumferentially surrounding the spring member. is a sleeve 146.

The spring member '130 may be brazed or soldered to the member 122 and to the collar 118, or may be retained by elastic forces generated by a tight fit or pressed on sleeve 146. The sleeve 146 contains a rear end 148 which may be pressed, brazed or soldered to the terminating member 113, and to the rear portion of the spring member 130 in the vicinity of the cylindrically extending member 122. The sleeve extends forwardly beyond the front end of the spring member 130 and contains an in-turned forward lip 152 that provides a rigid guide for the mating pin 112. The terminating member 113 is normally made of a malleable copper alloy or other suitable conductive material which is crimpable about the conductor 116. This material may be selected primarily for its good crimping characteristics. The outer sleeve 146 can be made of a material such as stainless steel or copper alloy as in the device of FIG. 1. The spring member 130 is chosen of spring material having maximum conductivity such as beryllium copper, a Phosphor bronze alloy or a cadmium-copper alloy which combines the characteristics of good conductivity as well as having good mechanical spring. In the device of FIG. I, normally a nickel copper alloy was utilized for the member 14 which had spr g characteristics and still was crimpable. However, such material was a compromise for both the crimping and the spring characteristics. In the device of FIG. 2, because of the choice of spring material, it is no longer necessary to prestress the spring member 130 by means of a compression sleeve as the material now has the desired spring characteristics. However, should even greater spring characteristics be desired, the sleeve 146 could be used as a compression sleeve for prestressing.

Referring now to FIG. 3 there is shown an alternative terminating member 153 for use with the contact member of FIG. 2. The terminating member contains a terminating portion 154 which may be butt Welded to the conductor 156. In such a case, the terminating end portion would be a fiat ended post to which the conductor wire 158 of conductor 156 would be welded. The terminating member material could then be chosen to have the desired characteristics necessary for a welded termination.

The multiple piece construction for the contact body allows the utilization of material forms and manufacturing processes better suitable to fabrication than those of a single contact body construction. By handling and finishing each of the components as separate pieces before assembly the problems attendant to finishing typical to conventional single body constructions are greatly reduced.

What is claimed is:

1. A socket contact for an electrical connector comprising: a contact body having rearward terminating means being made of a material which may readily be secured to a conductor; and a tubular spring member being made of a material having high conductivity and good spring characteristics and being formed of a hollow cylinder open at both ends and having a plurality of forwardly opening longitudinal slots extending from the forward end of said spring member to part way along its length to provide a plurality of forwardly extending contact spring fingers, said spring member being secured at its rear end to said rearward terminating means; the forward end of said terminating mens having a cylindrical appendage to fit contiguously to the rear internal surface of said spring member, said terminating means having a radial flange to fit contiguous to the rearward end of said spring member, said flange extending radially beyond the external surface of said spring member, and a cylindrical sleeve to fit contiguously to the external surface of said spring member, said sleeve having one end positioned contiguous to said flange; said terminating means, said spring member and said sleeve being fixed together.

2. A socket contact in accordance with claim 1 wherein said rearward terminating means is made of a material which may be readily crimped around said conductor.

3. A socket contact in accordance with claim 1 wherein said rearward terminating means is made of a material which may be readily welded to said conductor.

References Cited UNITED STATES PATENTS Desant 339262X Cornell 339258 Purinton 339.--258X Van Horssen 339262X Van Horssen 339258X Drinkwater 339258 10 IAN A. CALVERT, Primary Examiner U.S. Cl. X.R.

US3564487D 1969-02-03 1969-02-03 Contact member for electrical connector Expired - Lifetime US3564487A (en)

Priority Applications (1)

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US79608369A true 1969-02-03 1969-02-03

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US3564487A true US3564487A (en) 1971-02-16

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US3564487D Expired - Lifetime US3564487A (en) 1969-02-03 1969-02-03 Contact member for electrical connector

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BE (1) BE745377A (en)
DE (1) DE7003025U (en)
FR (1) FR2031260A5 (en)
GB (1) GB1241930A (en)

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Publication number Publication date
BE745377A (en) 1970-08-03
DE7003025U (en) 1970-05-14
FR2031260A5 (en) 1970-11-13
BE745377A1 (en)
GB1241930A (en) 1971-08-04

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