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Publication numberUS3157449 A
Publication typeGrant
Publication dateNov 17, 1964
Filing dateApr 11, 1962
Priority dateApr 11, 1962
Publication numberUS 3157449 A, US 3157449A, US-A-3157449, US3157449 A, US3157449A
InventorsWilliam M Hennessey
Original AssigneeBurroughs Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electrical connectors
US 3157449 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Nov. 17, 1964 w. M. HENNESSEY ELECTRICAL CONNECTORS Filed April 11, 1962 SHRUNK AND HARDENED INVENTOR. WILLIAM M. HENNESSEY ATTORNEY United States Patent Oflice 3,157,449 Patented Nov. 17, 1964 3,157,449 ELECTRICAL CONNECTORS William M. Hennessey, Roslyn, Pa, assignor to Burroughs Corporation, Detroit, Mich, a corporation of Michigan Filed Apr. 11, 1962, Ser. No. 186,699 2 Claims. (Cl. 339-66) This invention relates to electrical connectors and particularly to miniaturized electrical connectors.

The modern trend in miniaturization of electronic components has created special problems in electrical connectors which have been reduced in size and Weight to the point where they comprise thin, fragile bodies of insulating material which carry exceedingly fragile electrical contact members. Because of the small size of the parts and because of their fragility, there not presently available a strong, rugged connector assembly which is capable of being made and broken many times as required, for example, in testing electronic apparatus during assembly. Under some circumstances, for example in magnetic core memory assemblies made up of many memory planes, a very expensive memory unit can be rendered worthless by a connector which is broken during testing of one of the planes.

Accordingly, the objects of the present invention are directed toward the provision of improved electrical connectors which can be made as small and fragile as required while retaining ample ruggedness and durability.

Briefly, a connector embodying the invention includes first and second mating parts, each of which includes an insulating body and electrical contact means, the respective contact means being adapted to make contact with each other to eiiect the desired connection. A sleeve of resilient insulating material is fitted over the first mating part with a portion engaging the insulating body thereof, and the remainder extending axially beyond the end of the insulating body and surrounding preferably the entire length of the electrical contact means carried thereby. This extension of the sleeve is thus adapted to surround a considerable portion of the second part as it is brought into engagement with the first part when a connection is made. Thus, the sleeve acts as a guide for the second part as it engages the first and, in addition, holds both parts securely with respect to each other when they engage each other.

The insulating sleeve is of such material that the portion which surrounds and engages the insulating body of the first connector part can be treated to shrink and harden it to provide a rugged tight fit, while the extension portion which acts as a guide for the second mating part is allowed to retain its resilience.

The invention is described in greater detail by reference to the drawing wherein:

FIG. 1 is a perspective view of a connector arrangement embodying the invention and a portion of a typical piece of apparatus with which it may be used; and

FIG. 2 is a perspective View of the connector apparatus of the invention showing the connector parts assembled.

A connector arrangement embodying the invention and shown in the drawing includes a first mating member which comprises a body of insulating material of any suitable size and shape. The body carries electrical contact members 26 which extend longitudinally through the body and include a first external portion 30 which is adapted to be permanently secured by welding, riveting, or the like to a portion of the associated electronic circuit 34. The contact members 26 include a second portion 36 which is generally in the form of a rod or pin and is adapted to make electrical contact with a second similar member 42 having corresponding mating parts.

The second member 42 for use with the first member shown also comprises an insulating body 48 having electrical contact members 52 which are embedded in the body and are adapted to receive the contact members 26 of the first member 16. The contact members include external portions 56 similar to the portions of the first mernber to which external electrical connection may be made.

In a typical construction, the contact members 26 might be just a few millimeters in diameter, and the insulating body 20 would be just large enough to receive the contact members. Accordingly, when the first and second mating members 16 and 42 are assembled to provide an electrical connection, it is relatively easy for one part to rotate or move laterally with respect to the other because of the small size and fragility of the contact members. In addition, since the insulating bodies 20 and 48- are only large enough to accommodate the contact members 26 and 52, securing pins or keys, or the like cannot be readily provided. According to the invention, the connection assembly is improved and rendered strong and rugged by means of a sleeve 66 of resilient synthetic resinous material which is fitted over one of the connector members, preferably member 16, the one which is to be permanently secured to a fixed electrical circuit element. The sleeve 66 is of sufiicient length so that it engages and surrounds the insulating body 20 of the connector member and extends longitudinally so that it surrounds portions 36 of the contact members 26 which are to be engaged by the second mating member 42. The sleeve 66 is of a material which can be treated, for example, by the application of heat, to cause it to shrink and harden. One such material is sold by Amp, Inc. under the trademark Ampsulation and comprises polyvinyl chloride.

After the sleeve 66 of resilient material is positioned on the first connector member 16, heat is applied locally to the portion thereof which surrounds the insulating body 20. This portion of the sleeve contracts and hardens to provide a tight, rugged fit with the member 16. The portion 66' of the sleeve which extends longitudinally and surrounds the electrical contact member or pins 36 remains resilient and provides a guide for receiving the second connector member 42 when it is desired to connect the two members together.

The degree of shrinkage of the sleeve 66 depends on several factors including the size relationship between the sleeve and the connector member 16, the thickness of the sleeve, etc. Thus, under some circumstances, the visual shrinkage of the sleeve may be relatively small.

With the resilient portion 66 of guide sleeve 66 surrounding the contact pins 36, the desired connection of the two parts may be made and broken substantially any number of times without danger of the parts rotating or moving laterally with respect to each other and thus becoming broken.

It is clear that various modifications may be made in the specific apparatus shown within the scope of the invention. For example, it is clear that other types of connectors than those specifically shown in the drawing may be provided with resilient guide sleeves in the manner described above.

What is claimed is:

l. Electrical connection means including a first insulating body having first conductive members extending unsupported therefrom,

said conductive members being fragile and movable,

a second insulating body having conductive members embedded therein and adapted to engage the conductive members extending from said first body,

and a sleeve of insulating material surrounding and enclosing said first insulating body and the conductive members extending therefrom,

said sleeve including a first hard, shrunken, rigid portion surrounding said insulating body and a second flexible, larger diameter portion surrounding the conduc- 0 L tive members of said first body and adapted to easily sulating body are hollow tubes adapted to receive said receive said second insulating body whereby the conpins.

ductive members of said second body may engage the conductive members of said second body and said References Cited In the file of thls patent second flexible portion of said sleeve holds said sec- 5 UNITED STATES PATENTS ond insulating body in place. 2,410,321 Watts Oct. 29, 1946 2. The apparatus defined in claim 1 wherein said con- 2,883,520 Sasserson Apr. 21, 1959 ductive members extending from said first insulating body 2,95 8,844 Smith et al. Nov. 1, 1960 are pins and said conductive members in said second in- 3,020,516 Despard Feb. 6, 1962

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2410321 *Dec 14, 1943Oct 29, 1946Aircraft Marine Prod IncElectrical connector
US2883520 *Jan 14, 1957Apr 21, 1959Pennsylvania Furnace And IronLight unit for vehicles
US2958844 *May 2, 1955Nov 1, 1960Amp IncHigh voltage, high altitude bushing
US3020516 *Apr 25, 1958Feb 6, 1962Pass & Seymour IncElectrical connector body and cap construction with improved conductor securing means
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3313017 *Oct 12, 1962Apr 11, 1967Western Electric CoFabrication of electrical apparatus
US3455022 *Oct 18, 1965Jul 15, 1969Joseph E SchmitzMethod for producing electrical terminals
US3468024 *Oct 20, 1965Sep 23, 1969Yonkers John LMethod and apparatus for orienting and assembling small parts
US3839783 *Jul 12, 1972Oct 8, 1974Rodan Ind IncThermistor manufacturing method
US4026015 *Mar 29, 1976May 31, 1977Amp IncorporatedHeat-shrinkable molded high voltage connector
US4528619 *Jun 24, 1983Jul 9, 1985Gte Products CorporationReplaceable lamp unit providing hermetic seal and fixed alignment for electric lamp contained therein and automobile headlight utilizing same
US4569005 *Jan 15, 1985Feb 4, 1986Gte Products CorporationReplaceable lamp unit and automobile headlight utilizing same
US4569006 *Jan 15, 1985Feb 4, 1986Gte Products CorporationReplaceable lamp unit and automobile headlight utilizing same
US4598474 *Jun 11, 1984Jul 8, 1986Siemens AktiengesellschaftMethod of making an electrical plug connection
US5278354 *Feb 6, 1991Jan 11, 1994Raychem SaElectrical connection
US6527599 *May 28, 1999Mar 4, 2003Honeywell Inc.Housing with integrally molded connectors
US7753740Jul 20, 2007Jul 13, 2010Numatics, IncorporatedModular electrical bus system
US7896711Jun 10, 2010Mar 1, 2011Numatics, IncorporatedModular electrical bus system
US7967646Jun 10, 2010Jun 28, 2011Numatics, IncorporatedModular electrical bus system
US20020046875 *May 11, 2001Apr 25, 2002Thomas BaumannInsulation of stator windings with shrink-on sleeves
US20090023320 *Jul 20, 2007Jan 22, 2009Numatics, IncorporatedModular electrical bus system
US20100327200 *Jun 25, 2010Dec 30, 2010Robertshaw Controls CompanyWater Tight Valve Having Sealed Flying Leads
DE2942569A1 *Oct 22, 1979Apr 30, 1980Gen Motors CorpElektrische anschlussklemme
EP0973234A2 *Jul 15, 1999Jan 19, 2000Sumitomo Wiring Systems, Ltd.Electrical corrector with locking ring
U.S. Classification439/374, 29/447, 439/736, 174/DIG.800, 29/884, 264/230, 439/932
International ClassificationH01R13/502
Cooperative ClassificationH01R13/5025, Y10S174/08, Y10S439/932
European ClassificationH01R13/502A