US3781765A - Electrical connectors with internal and external strain-relief for conductor wires - Google Patents

Electrical connectors with internal and external strain-relief for conductor wires Download PDF

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Publication number
US3781765A
US3781765A US00813216A US3781765DA US3781765A US 3781765 A US3781765 A US 3781765A US 00813216 A US00813216 A US 00813216A US 3781765D A US3781765D A US 3781765DA US 3781765 A US3781765 A US 3781765A
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US
United States
Prior art keywords
wires
cord
conductor
clamping members
wire
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Expired - Lifetime
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US00813216A
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English (en)
Inventor
H Schleicher
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Cooper Industries LLC
Arrow Hart Inc
Original Assignee
Arrow Hart Inc
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Publication of US3781765A publication Critical patent/US3781765A/en
Assigned to COOPER INDUSTRIES, INC, A CORP.OF OHIO reassignment COOPER INDUSTRIES, INC, A CORP.OF OHIO ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CROUSE-HINDS COMPANY
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/502—Bases; Cases composed of different pieces

Definitions

  • a dead-front connector has two means to grip the wires within the housing, plus a means to grip the whole cord outside the housing, and a seal to prevent bits of foreign matter from entering the housing.
  • the outside means grips the cord as a whole and is made to conform to the shape of any standard size wire reducing to a minimum the crushing force and danger of short circuit.
  • One internal gripping means is the connection between the conductor and its respective contact member. The other internal gripping means grips the insulation of each individual wire so that it is not possible to apply a force to the terminal connection of any wire and contact by pulling from outside the housing. Pulling the wires out of engagement with their contact members with the attendant danger of causing a short circuit within the housing is thus prevented.
  • This invention relates to electrical caps and connectors to which are to be connected multi-wire conductor cords of the sort that have a plurality of individual insulated wires within an insulating sheath. More particularly, the invention relates to caps and connectors of insulation material which have, (a) clamping means on the receptacle and plug contacts housed within the insulation material so as to grip the bared ends of the individual insulated wires; (b) wire gripping means for the individual insulated wires inside the cap and connector and (c) external conductor cord gripping or strain relief means.
  • FIG. 2 is a bottom end view of the connector of FIG.
  • FIG. 3 is a perspective view of receptacle contacts embodied in FIG. 1.
  • FIG. 4 is aside elevation view of the connector of FIG. 1.
  • FIG. 6 is an exploded view of the plug-connector of FIG. 5.
  • FIG. 7 is a plan view looking down into the shell of FIG. 6.
  • FIG. 8 is a bottom plan view of the inner or prongreceiving body of FIG. 6.
  • FIG. 9 is a longitudinal diametrical section view, partly broken away, of the connector of FIG. 6.
  • FIG. 10 is an exploded detail view of one exterior cord gripping clamp member and insert.
  • FIG. 11 is a plan view of members of the exterior clamping means of the type shown in FIG. 6 with inlarge or small diameter.-
  • the assembled connector has two main parts, a receptacle as seen in FIG. 4 and a plug as seen in FIG. 5. These parts may be pushed together and pulled apart in usual fashion to connect and disconnect them.
  • the invention is illustrated and described as embodied in three-wire form, two wires w, w being conductor wires and the third G, being a ground wire. However, as will clearly appear, the invention is not limited to a particular number of wires.
  • the receptacle is built up from three insulation members 20, 30 and 40 plus a gasket 49, and a strain relief fitting 50, 60 all as more fully described hereinafter.
  • the body part 20 is cylindrical and has three parallel independent and isolated recesses 21, 22, and 23 extending therethrough parallel to the axis of the body. These recesses are adapted to receive stationary stamped sheet metal contact members or receptacle contacts 25, 26 and a ground contact 27 of conventional form having two facing spring fingers 25a, 25b and a third finger 25c at right angles thereto. Bent up from the fingers is a wire terminal tab such as 25! through which freely passes a wire binding screw 29 that threads into a tapped hole in a wire clamping plate 28.
  • an inner body 30 made of insulating material such as nylon and having a generally cylindrical or thick disc shape, but of slightly less diameter than the body'20.
  • Three recesses are formed in that face of the inner body 30 which is adapted to lie against and on top of the inner face of the outer body 20. These recesses register in part with the recesses in the outer body and receive the wire terminal gripping elements 25t, 28 and 29 of the fixed contacts.
  • the recesses in the inner body extend radially outward as at 31 and 32 to provide access to the wire binding screws 29, so that the clamping plates 28 can be moved toward and away from the terminal tabs 25! of the contact members.
  • V-shaped steel spring (not shown) members stamped from sheet metal with upstanding fingers may be inserted with the fingers to lie in back of and press against the fingers of the receptacle contacts inwardly to provide a firmer grip by the contact fingers against the prongs of a plug member when a plug is connected with the connector member.
  • the inner body member 30 is adapted to fit or seat within the inner portion 41 of a hollow cylindrical cupshaped shell 40 made from insulating material and having approximately the same outer diameter as the outer body 20.
  • the shell 40 has a central passageway 42 for the passage therethrough of the three wire conductor cord.
  • the strain relief fitting 50 is secured to the top wall of the shell by screws or other suitable securing means passing through three holes 54 and which register with three holes 44 in the outer (top) face of the shell 40.
  • the strain relief fitting is preferably made of insulating material such as nylon or other suitable moldable material and comprises a flat annulus 51 from which two parallel arms 52 extend up at diametrically opposite positions around the annulus. The arms extend in the same direction and are parallel to the axis of the shell 40 and the annulus 51.
  • the strain relief fitting clamps between itself and the shell 40 a thin soft rubber gasket or washer 49 through which the conductor cord passes.
  • the gasket may be made of other flexible moisture proof material. Due to its resilient elastic nature the periphery of its central hole 49a can lightly embrace conductor cords of different diameters.
  • the receptacle is normally factory assembled, but need not necessarily be so.
  • the outer body and inner body 30 may be secured together by a central bolt 38 or by any other suitable means, with the fixed contacts 25, 26 and 27 in their respective recesses.
  • three wire holes 35, 36 and 37 are bored or molded through the inner body 30 parallel to the body axis adjacent and leading to the wire terminals of the fixed contacts so that the bared ends of the wires can pass through the holes and be clamped to the wire terminals of the fixed contacts.
  • the present invention provides an important structural difference from the prior art in the formation of the inner body 30 and the adjacent cooperating surface of the shell-40.
  • This formation lies directly under the conductor cord passage 42 of the shell and extends radially outward with respect thereto beyond the periphery of that passage.
  • the surface of the shell over the pyramidal formation in assembled condition of the shell 40 and body 30 lies far enough away from the pyramidal formation to permit passage of the wires w, w and G when they are separated and spread and inserted into their separate holes 35, 36 and 37 leading to the wire terminal clamps, e.g. 28, but close enough, nevertheless, so that when the inner body and shell are secured together the wires are clamped between the body and shell and frictionally gripped by the pyramidal formation whose steps bite into the insulation of the wires and firmly hold each one individually.
  • a thin annulus 43 of tough resilient material, such as nylon, is located between the inner body 30 and the shell 40.
  • the annulus rests against a shoulder 45 inside the shell between the shell wall and the center hole 42 through which the cord C passes.
  • annulus is held against the shoulder by the bolts or rivets which hold the strain relief member 50, shell 40 and inner body 30 together.
  • the annulus being flexible can move a very slight amount, and being thin can bite into the insulation on the individual wires of the conductor, on the opposite side from the pyramidal steps. This slight flexibility enables resilient gripping of the individual wires which may vary in thickness in wires of different diameters, thus providing self-adjustability. Thus despite any slippage of the wires within the sheath of the conductor cord no strain can be transmitted to the wire terminals.
  • the plug member illustrated in FIGS. 5 and 6 it is formed, generally speaking, similarly to the connector member in that it is built up of three insulation members 120, 130 and 140 plus a strain relief fitting and clamps 50 and 60 gasket 49.
  • the outer body which again is cylindrical but thinner than body 20 extend the contact fingers 131 and 132 and ground contact prong 133 that are mounted on the inner body 130.
  • the inner body is similar to the inner body of the connector but instead receives the wire terminal ends of the plug contacts and grounding prong.
  • the plug fingers 131 and 132 and the ground prong 133 have wire clamping plates and binding screws 129. I
  • the shell 140, strain reliefmember 50 and the clamping members 60 may be formed similarly to the corresponding members previously described in connection with the receptacle member.
  • the inner body 130 has its inner face (the bottom not-visible face in FIG. 6) formed with a stepped pyramidal formation 139 like 39 in FIG. 1 so that it will, in cooperation with the annulus 43 in the shell 140, grip and bite into the insulation of the individual conductor wires connected to the fingers and prongs 131, 132 and 133.
  • a pair of identical insulating clamps 60 are provided on opposite sides of the conductor cord and on opposite sides of the arms 52 of the strain relief fitting.
  • These clamping members may be made of nylon, delrin, or any other suitable strong insulating material in different forms of which one form is illustrated in FIGS. 1, 10, 11 and 12.
  • Clamping screws 62 pass freely through holes in. one end of each of the clamping members and thread into threaded recesses in the opposite ends of the other clamping member.
  • the two clamp bodies which make up the strain relief fitting may be molded as elongated blocks having in their mid-portions an arcuate indentation 62, within which is another arcuate recess 64 sunk deeper into the body 60.
  • an arcuate insert 66 preferably of molded insulation is insertable.
  • the insert and the recess 64 are made in complementary arcuate form so that the insert will fit snugly against the recess walls but extend outwardly sufficiently to present a smaller size opening between the two clamp members when they are placed in confronting position.
  • FIG. 11 shows the inserts in place, for use with a small diameter conductor cord.
  • FIG. 12 shows the clamp bodies used with a large diameter conductor cord, with the inserts removed.
  • the insert is provided with a stem 68 extended radially from the convex side thereof.
  • the stem is insertable as a sliding fit into a hole or passage 69 through the clamp body 60 within the deep recess 64.
  • the stem extends entirely through the body 60 so that its end protrudes. This enables pressure to be put against it to fatcilitate removal of the insert when desired.
  • the insert preferably has ridges in its concave surface to bite into the conductor sheath as the clamping members are clamped together.
  • clamp bodies and inserts are preferably made of insulation, it is possible also to make them of stamped sheet metal, with some danger of short circuiting if the clamping is too tight.
  • the clamping members may have arcuate jaws 60a projecting from their inner surfaces and curved to engage around the surface of the conductor cord C. Ridges (not visible) may be formed on the inner surfaces of the jaws 60a to bite into the insulation of the conductor.
  • the jaws may be connected to the body of the clamp members by a rib 60c which extends axially with respect to the conductor cord which the jaws are to engage.
  • the invention provides both external and internal strain relief to hold not only the sheath conductor cord but also the conductor wires individually in a firm grip and prevent slippage of the wires within the sheath from transmitting strain of the wires directly to the wire terminals.
  • An electrical connector having an insulating body, contact and terminal means supported by said body, said body means having a passage for a conductor cord having a plurality of wires, strain relief means mounted on said body comprising a pair of clamping members adapted to be positioned on opposite sides of the cord, means to draw said clamping members toward'each other against the cord, means to secure the clamping members to said body, said clamping members comprising a transverse portion tangential to the cord and a flexible arcuate cord-gripping portion spaced inwardly from said tangential portion, said arcuate portion being connected to said transverse portion by a rib permitting movement of said arcuate portion to adapt to the cord.
  • An electrical connector comprising first rigid insulating body means, a plurality of contact means, wire terminal means on said contact means, said wire terminal means being mounted within said body means, second rigid insulating body means including a passage for a conductor cord having a plurality of insulated wires, a pyramidal stepped formation comprising a plurality of steps formed integrally on one of said bodies and extending toward the other individually engaging the individual wires on one side between said passage and said wire terminal means, a thin flexible member on one of said bodies engaging the wires individually on the opposite side from said stepped formation when said bodies are secured together, said flexible member being adapted to accommodate different thicknesses of wires and resiliently bite into them, whereby said wires are gripped to prevent strain exerted on said conductor cord and wires from reaching said terminal means, and means to secure said first and second body means together.

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  • Multi-Conductor Connections (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
US00813216A 1969-04-03 1969-04-03 Electrical connectors with internal and external strain-relief for conductor wires Expired - Lifetime US3781765A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US81321669A 1969-04-03 1969-04-03

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US (1) US3781765A (enrdf_load_stackoverflow)
GB (3) GB1297666A (enrdf_load_stackoverflow)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4021092A (en) * 1975-06-09 1977-05-03 The Ericson Manufacturing Company Electrical connector
US4273406A (en) * 1978-12-28 1981-06-16 Mitsuoka Electric Mfg. Co., Ltd. Electrical cord adapter
US4284318A (en) * 1979-03-19 1981-08-18 Westinghouse Electric Corp. Electric plug
US4840581A (en) * 1988-12-22 1989-06-20 Amp Incorporated Cable jacket strain relief adapter assembly
US5178559A (en) * 1992-06-26 1993-01-12 The United States Of America As Represented By The Secretary Of The Navy Stress relief backshell assembly
USD338190S (en) 1991-09-16 1993-08-10 Ray Bradbury Plug skid for an electric cord
US5895981A (en) * 1998-02-10 1999-04-20 Reliance Time Control, Inc. Generator transfer panel with a terminal arrangement for establishing a direct connection to a remote power inlet
US5984719A (en) * 1997-12-31 1999-11-16 Reliance Controls Corporation Remote power inlet box for an auxiliary power supply system
USD425490S (en) * 1998-06-12 2000-05-23 Reliance Controls Corp. Transfer switch with terminal compartment
US6107701A (en) * 1998-08-24 2000-08-22 Reliance Controls Corporation Optional meter panel for a transfer switch having a terminal compartment
US6163449A (en) * 1998-11-23 2000-12-19 Reliance Controls Corporation Transfer switch with optional power inlet and meter panel
US6184461B1 (en) 1997-12-12 2001-02-06 Reliance Controls Corporation Generator power inlet box with integral generator cord
US6365990B2 (en) 1999-06-21 2002-04-02 Reliance Controls Corporation Cover plate terminal assembly for a transfer switch
US6414240B1 (en) 2000-03-15 2002-07-02 Reliance Controls Corporation Generator transfer switch having a compartment with exposed wire leads for interconnection with a power input
US6504268B1 (en) 2000-10-19 2003-01-07 Reliance Controls Corporation Transfer switch with selectively configurable cover structure with power input and meter capability
US6564427B1 (en) 2001-02-27 2003-05-20 Reliance Time Controls, Inc. Hinged assembly for cover arrangement in power inlet box
US20100159739A1 (en) * 2008-12-19 2010-06-24 Gordon Krueger Connector back shells having a plurality of cable exit angles
USD662896S1 (en) 2010-12-06 2012-07-03 Reliance Controls Corporation Power inlet box
US9231332B2 (en) * 2014-01-08 2016-01-05 Ambit Microsystems (Shanghai) Ltd. Built-up plug
US9276346B1 (en) 2013-03-15 2016-03-01 Reliance Controls Corporation Gasketless flip lid for a flanged power inlet receptacle
US10404048B2 (en) * 2013-11-26 2019-09-03 Commscope Technologies Llc Adapter for sealing cover for electrical interconnections
US20190348795A1 (en) * 2017-01-09 2019-11-14 Hubbell Incorporated Cover for cable connector
US10886714B2 (en) * 2018-04-04 2021-01-05 Yazaki Corporation Branching circuit body and branching method of electric wires

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8426749D0 (en) * 1984-10-23 1984-11-28 Ranton & Co Ltd Electrical accessory connections
GB2230655A (en) * 1989-04-15 1990-10-24 Stc Plc Grommet
GB2459146A (en) * 2008-04-10 2009-10-21 Calder Ltd Cable retention bracket

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1398228A (en) * 1918-01-12 1921-11-29 Bertram J Grigsby Attachment-plug
GB251676A (en) * 1925-01-08 1926-05-10 John Ashworth Crabtree Improvements in or relating to the means utilized for securing electric conductors to or in relation to contact members or apparatus to which it is desired to supply electric current
US2276557A (en) * 1939-07-22 1942-03-17 Woodhead Daniel Electric connector
FR1043916A (fr) * 1951-10-17 1953-11-12 Lavoillotte Ets Douille à suspendre pour lampes à incandescence
GB702066A (en) * 1951-02-22 1954-01-06 Gen Electric Co Ltd Improvements in or relating to electric connectors provided with cord gripping means
CH337902A (de) * 1956-03-07 1959-04-30 Woertz Oskar Vorrichtung mit Kabelstopfbüchse
US2970288A (en) * 1956-06-19 1961-01-31 Hubbell Inc Harvey Top wired electrical cap and connector
US2972492A (en) * 1958-10-13 1961-02-21 Glenair Cable extension sleeve
US3181105A (en) * 1963-06-17 1965-04-27 Thomas G Roach Cable connector
US3372361A (en) * 1965-06-15 1968-03-05 Fargo Mfg Co Inc Cable connector
US3390371A (en) * 1966-06-24 1968-06-25 Daniel Woodhead Company Cable clamp for electrical wiring device

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1398228A (en) * 1918-01-12 1921-11-29 Bertram J Grigsby Attachment-plug
GB251676A (en) * 1925-01-08 1926-05-10 John Ashworth Crabtree Improvements in or relating to the means utilized for securing electric conductors to or in relation to contact members or apparatus to which it is desired to supply electric current
US2276557A (en) * 1939-07-22 1942-03-17 Woodhead Daniel Electric connector
GB702066A (en) * 1951-02-22 1954-01-06 Gen Electric Co Ltd Improvements in or relating to electric connectors provided with cord gripping means
FR1043916A (fr) * 1951-10-17 1953-11-12 Lavoillotte Ets Douille à suspendre pour lampes à incandescence
CH337902A (de) * 1956-03-07 1959-04-30 Woertz Oskar Vorrichtung mit Kabelstopfbüchse
US2970288A (en) * 1956-06-19 1961-01-31 Hubbell Inc Harvey Top wired electrical cap and connector
US2972492A (en) * 1958-10-13 1961-02-21 Glenair Cable extension sleeve
US3181105A (en) * 1963-06-17 1965-04-27 Thomas G Roach Cable connector
US3372361A (en) * 1965-06-15 1968-03-05 Fargo Mfg Co Inc Cable connector
US3390371A (en) * 1966-06-24 1968-06-25 Daniel Woodhead Company Cable clamp for electrical wiring device

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4021092A (en) * 1975-06-09 1977-05-03 The Ericson Manufacturing Company Electrical connector
US4273406A (en) * 1978-12-28 1981-06-16 Mitsuoka Electric Mfg. Co., Ltd. Electrical cord adapter
US4284318A (en) * 1979-03-19 1981-08-18 Westinghouse Electric Corp. Electric plug
US4840581A (en) * 1988-12-22 1989-06-20 Amp Incorporated Cable jacket strain relief adapter assembly
USD338190S (en) 1991-09-16 1993-08-10 Ray Bradbury Plug skid for an electric cord
US5178559A (en) * 1992-06-26 1993-01-12 The United States Of America As Represented By The Secretary Of The Navy Stress relief backshell assembly
US6184461B1 (en) 1997-12-12 2001-02-06 Reliance Controls Corporation Generator power inlet box with integral generator cord
US6369321B1 (en) 1997-12-12 2002-04-09 Reliance Controls Corporation Generator power inlet box with selectively engageable generator cord
US5984719A (en) * 1997-12-31 1999-11-16 Reliance Controls Corporation Remote power inlet box for an auxiliary power supply system
US5895981A (en) * 1998-02-10 1999-04-20 Reliance Time Control, Inc. Generator transfer panel with a terminal arrangement for establishing a direct connection to a remote power inlet
USD425490S (en) * 1998-06-12 2000-05-23 Reliance Controls Corp. Transfer switch with terminal compartment
US6107701A (en) * 1998-08-24 2000-08-22 Reliance Controls Corporation Optional meter panel for a transfer switch having a terminal compartment
US6163449A (en) * 1998-11-23 2000-12-19 Reliance Controls Corporation Transfer switch with optional power inlet and meter panel
US6365990B2 (en) 1999-06-21 2002-04-02 Reliance Controls Corporation Cover plate terminal assembly for a transfer switch
US6414240B1 (en) 2000-03-15 2002-07-02 Reliance Controls Corporation Generator transfer switch having a compartment with exposed wire leads for interconnection with a power input
US6504268B1 (en) 2000-10-19 2003-01-07 Reliance Controls Corporation Transfer switch with selectively configurable cover structure with power input and meter capability
US6564427B1 (en) 2001-02-27 2003-05-20 Reliance Time Controls, Inc. Hinged assembly for cover arrangement in power inlet box
US8313340B2 (en) * 2008-12-19 2012-11-20 Joslyn Sunbank Company Llc Connector back shells having a plurality of cable exit angles
US20100159739A1 (en) * 2008-12-19 2010-06-24 Gordon Krueger Connector back shells having a plurality of cable exit angles
US8025525B2 (en) * 2008-12-19 2011-09-27 Joslyn Sunbank Company Llc Connector back shells having a plurality of cable exit angles
US20110312209A1 (en) * 2008-12-19 2011-12-22 Gordon Krueger Connector back shells having a plurality of cable exit angles
USD662896S1 (en) 2010-12-06 2012-07-03 Reliance Controls Corporation Power inlet box
US9276346B1 (en) 2013-03-15 2016-03-01 Reliance Controls Corporation Gasketless flip lid for a flanged power inlet receptacle
US10404048B2 (en) * 2013-11-26 2019-09-03 Commscope Technologies Llc Adapter for sealing cover for electrical interconnections
US9231332B2 (en) * 2014-01-08 2016-01-05 Ambit Microsystems (Shanghai) Ltd. Built-up plug
US20190348795A1 (en) * 2017-01-09 2019-11-14 Hubbell Incorporated Cover for cable connector
US10886714B2 (en) * 2018-04-04 2021-01-05 Yazaki Corporation Branching circuit body and branching method of electric wires

Also Published As

Publication number Publication date
GB1297665A (enrdf_load_stackoverflow) 1972-11-29
GB1297664A (enrdf_load_stackoverflow) 1972-11-29
GB1297666A (enrdf_load_stackoverflow) 1972-11-29

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AS Assignment

Owner name: COOPER INDUSTRIES, INC, 1001 FANNIN, HOUSTON, TEXA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CROUSE-HINDS COMPANY;REEL/FRAME:004103/0954

Effective date: 19830223