US3603913A - Strain relief clamp for electrical wiring connector - Google Patents

Strain relief clamp for electrical wiring connector Download PDF

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Publication number
US3603913A
US3603913A US815314A US3603913DA US3603913A US 3603913 A US3603913 A US 3603913A US 815314 A US815314 A US 815314A US 3603913D A US3603913D A US 3603913DA US 3603913 A US3603913 A US 3603913A
Authority
US
United States
Prior art keywords
clamp
attaching member
wires
arm
connector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US815314A
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English (en)
Inventor
John M Hasty Jr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lockheed Martin Corp
Original Assignee
Lockheed Aircraft Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lockheed Aircraft Corp filed Critical Lockheed Aircraft Corp
Application granted granted Critical
Publication of US3603913A publication Critical patent/US3603913A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/56—Insulating bodies
    • H01B17/58—Tubes, sleeves, beads, or bobbins through which the conductor passes
    • 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
    • H01R13/58—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable
    • H01R13/5804—Means for relieving strain on wire connection, e.g. cord grip, for avoiding loosening of connections between wires and terminals within a coupling device terminating a cable comprising a separate cable clamping part

Definitions

  • a clamping device is designed for use on general purpose multipin connectors by attaching to the connector and extending therefrom to terminate in a wire-bearing surface with means to facilitate retention of a band or tie string to secure all the wires extending from the connector.
  • This bundle of wires is thereby gripped in a firm and immovable position so that all linear and lateral movement thereof which might occur in operation is prevented from being applied to the point of connection of the several wires with the connector.
  • stressing and eventually breaking of the connection point of any of the several wires is obviated.
  • Attovney STRAIN RELIEF CLAMP FOR ELECTRICAL WIRING CONNECTOR This invention relates broadly to fittings of the type employcd in electrical installations, and more particularly to a strain relief clamp, as it is commonly called, adapted for attachment to electrical connector elements, both plugs and receptacles, with multiple conductors or wires in order to secure the wires extending from the element or fitting individually and as a bundle in substantially fixed position relative to their respective connections within the fitting.
  • each of the tires or conductors is relatively flexible, it is especially subject to wear and tear adjacent its point of connection to the fitting during installation and normal operation due to both lateral and pulling forces in it and on the bundle of wires of which it is one.
  • wire bundles are especially subjected to flexing, pulling and movement in general. This is aggravated by the fact that these bundles are lengthy and circuitous as well as oftentimes required to be forced into out-of-the-way places and small areas due to stringent space conditions typical of aircraft.
  • the practice has, therefore, developed of providing a strain relief clamp in the form of a generally tapered fitting which is secured to the projects from the and element, the outer, smaller end of which is adjustable to clampingly engage and secure the wire bundle. Movement and flexing of the several wires along their lengths is thereby prevented from passing this clamp and being transmitted to the point of the connection thereof in the connector element.
  • these fittings have been lightened as much as possible by the removal of large portions of the material in the tapered section between fitting ends so that the ultimate part comprises in effect a pair of concentric rings.
  • the larger of these rings is adapted to attach to a standard connector element with the smaller ring in spaced relationship thereto to clampingly engage the wire bundle.
  • the present invention proposes to overcome the foregoing and other objections with prior fittings by the provision of an improved clamp which offers optimum efficiency and reliability in the retention of multiple wires in a bundle connected to a connector element.
  • the clamp herein proposed is formed by an attaching ring which engages and secures to the electrical connector element and is provided with a single extension arm angularly disposed and projecting therefrom to terminate in a keeper element for coaction with a tying strap, band or tape.
  • This keeper element is formed or otherwise provided with an inner surface which is arcuate to establish the periphery of the bundle of wires from the connector element.
  • the extending wires are thereby cradled therein and the strap or band encircles the wires and arm to apply the clamping pressure when drawn taut.
  • the dimension of the arm in the area of the strap is sized to the transverse dimension o'fa single wire so that it is effective in its gripping and securing function not only where a bundle of wires are involved but even where only one or two are required to be clamped.
  • the clamping strap or band is of relatively flexible and preferably a dielectric material to minimize any chance of damaging the insulation of the wires causing a short circuit of arcing thereacross.
  • FIG. l is a side elevation of a clamp designed and constructed in accordance with the teachings of this invention showing the collar or ring adapted for coaction with a connector element, either plug or receptacle, and the projecting arm with a strap-engaging and retaining means at the end thereof;
  • FIG. 2 is an end elevation or a view taken from the right side of FIG. 1 to show the configuration of the arm which results in a substantially concentric disposition of the strap-engaging and retaining member relative to the attaching ring;
  • FIG. 3 is a side elevation looking at FIG. 2 from the bottom;
  • FIG. 4 is a typical installation showing the clamp of FIGS. 1 through 3 applied to a receptacle and also to a plug whereby the several wires comprising the bundle of each connector element are located and retained in a substantially fixed position with respect to its point of connection within the plug or receptacle;
  • FIG. 5 is a view similar to FIG. 3 of an alternate form of Clamp designed and constructed for application where the wires leaving the connector element are required to turn at a substantially angle to show a modified arm and strap-engaging and retaining means configuration;
  • FIG. 6 is a plan view of the clamp shown in FIG. Sand cor responds to the view of FIG. 2;
  • FIG. 7 is a view taken from the side of FIG. 5;
  • FIG. 8 is a view similar to FIGS. 2 and 6 with the arm and strap-engaging and retaining means broken away to show primarily a modified form of connector element-engaging collar or ring that is applicable to either form of the clamp shown in FIGS. 3 or 5.
  • 10 designates a strain relief clamp as herein proposed in its preferred form.
  • This clamp is formed by an annular collar or ring lll which is internally threaded as indicated at 12 to correspond to the external threads 113 of a connector element either a receptacle ll ll or plug 15 whereby it is secured thereto.
  • the receptacle I4 is mounted in a wall 16 or other relatively stationary structure where it is adapted to receive the: plug is which is locked thereto by an appropriate connecting collar 17.
  • the external surface or periphery of the ring llll is knurled as at Ill or otherwise provided with projections whereby torque is readily applied thereto either by hand or by a suitable tool.
  • the ring llll is formed with an integral extension arm 18 which terminates at its outer end on a pair of spaced arcuate lateral projections 19 interconnected by an extension arm portion lid of substantially smaller transverse dimension approximating the transverse dimension of the smallest wire to be clamped thereby as will become more apparent.
  • the inner surfaces 19 of the projections 19 are disposed in a common plane which is concentric with respect to the ring 11.
  • the intermediate portion of the arm 18, i.e., that portion between the ring 11 and the projections 19, is bent or offset to locate the arcuate surfaces 19" of the projections 19 radially inward of the corresponding arc of the ring 11.
  • each clamp when attached to one of a pair of connecting elements 14 or 15 so as to extend therefrom in the direction away from the other connecting element 14 or 15, the inner surfaces 19 of the arcuate projections 19 are each adapted to abut and define the periphery of a bundle of wires extending from the associated connecting element 14 or 15.
  • a band or strap 21 encircling portion 18 of the arm 18 and passing between the pair of projections 19 and around the wire bundle 20 can be tightened so as to firmly secure the several wires constituting the bundle is substantially immovable relative position.
  • any band or strap 21 may be employed to apply the clamping pressure to each wire bundle 20 provided it is generally flexible and can be secured against slippage in the fully taut condition, it is preferred that this be fabricated of dielectric material.
  • One such strap 21 ideally suited for this application is disclosed in U.S. Pat. No. 3,186,047issued to D. P. Schwester et al. on June 1, 1965. This strap is fabricated of nylon and contains an internal metal self-clinching means 22 within a keeper element 23 whereby as the strap is retained in a taut position when it passes through the keeper, and is drawn tight and then cut.
  • the arm 18a is an integral extension on collar 11a and turns angularly outwardly with respect to the center thereof.
  • the are 18a is comparatively wider than the am 18 to assure containment of all of the wires 20 from the associated connector element and which it is intended to clamp.
  • a single terminal projection 19a is provided being connected to the arm 18 by an appreciably smaller portion l8'a and with its arcuate surface 19a disposed at substantial right angles to the inner periphery of the collar 110.
  • the collar 11 or 11a may, if desired, by interrupted as at 24 to allow connection and/or disconnection of one or more of the wires 20 in the bundle from the associated connector element without the necessity of complete removal and replacement of the clamp 10 or 10a
  • the dimension of this interruption or space is preferably held to a minimum, i.e., approximately equal to the transverse dimension of the largest wire 20 of the bundle so as not to unduly weaken it structurally when fully assembled and installed for operation.
  • a strain relief clamp for an electrical connector element having multiple attachment points for the connection of the ends of several wires extending therefrom comprising:
  • an attaching member including engagement means for the connection thereof to the end of said element
  • an arm carried by and extending in a direction away from said attaching member said arm having a relatively wide root end and narrowing outwardly to terminate in a keeper element formed by an extension arm portion of smaller transverse dimension than said narrowing arm and of generally uniform transverse dimension sized to accommodate the transverse dimension of a wire of said connector element to be connected to said member as aforesaid, a step between said narrowing arm and said extension arm portion and a lateral projection at the extremity of said extension arm portion on each side thereof, said projection being defined by a surface disposed in a predetermined position relative to an inner periphery of said attaching member adapted to act as a bearing surface for said wires when said member is connected to said element as aforesaid.
  • the clamp of claim 1 adapted to be connected as aforesaid to connector elements having wires of different transverse dimensions wherein said attaching member is a ring interrupted by a space to accommodate the transverse dimension of the largest wire accommodate by said member.
  • said keeper element includes a second lateral projection on each side of said extension arm portion in spaced relation to and inwardly of the extreme lateral projection aforesaid, said lateral projections having inner surfaces in alignment and concentric with respect to said attaching member.
  • the clamp of claim 5 adapted to be connected as aforesaid to connector elements having wires of different transverse dimensions wherein the transverse dimension of said arm disposed between said extreme and said second lateral projection approximates that of the smallest wire of any said connector element.

Landscapes

  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Multi-Conductor Connections (AREA)
  • Installation Of Indoor Wiring (AREA)
US815314A 1969-04-11 1969-04-11 Strain relief clamp for electrical wiring connector Expired - Lifetime US3603913A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US81531469A 1969-04-11 1969-04-11

Publications (1)

Publication Number Publication Date
US3603913A true US3603913A (en) 1971-09-07

Family

ID=25217431

Family Applications (1)

Application Number Title Priority Date Filing Date
US815314A Expired - Lifetime US3603913A (en) 1969-04-11 1969-04-11 Strain relief clamp for electrical wiring connector

Country Status (8)

Country Link
US (1) US3603913A (enrdf_load_stackoverflow)
JP (1) JPS515737Y1 (enrdf_load_stackoverflow)
DE (2) DE2017322C3 (enrdf_load_stackoverflow)
FR (1) FR2043130A5 (enrdf_load_stackoverflow)
GB (1) GB1310156A (enrdf_load_stackoverflow)
IE (1) IE33768B1 (enrdf_load_stackoverflow)
NL (1) NL162257B (enrdf_load_stackoverflow)
SE (1) SE367740B (enrdf_load_stackoverflow)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3732527A (en) * 1971-05-04 1973-05-08 T Mcknight Strain relief clamp
US3792417A (en) * 1972-08-23 1974-02-12 Bendix Corp Strain relief clamp for an electrical connector
US3828302A (en) * 1972-09-13 1974-08-06 Bunker Ramo Electrical connector and mounting means
US4070083A (en) * 1977-01-31 1978-01-24 Dipalma Joseph Electrical power line extension
DE3402919A1 (de) * 1984-01-28 1985-08-01 Messerschmitt-Bölkow-Blohm GmbH, 8012 Ottobrunn Endgehaeuse fuer einen steckverbinder
US4917622A (en) * 1989-07-10 1990-04-17 Sundstrand Corporation Strain relief device for electrical cables
US5368504A (en) * 1991-12-09 1994-11-29 Itt Corporation Shielded cable connector
EP0685908A1 (fr) * 1994-06-03 1995-12-06 Framatome Connectors International Dispositif serre-câbles formant raccord arrière pour connecteur
US5653605A (en) * 1995-10-16 1997-08-05 Woehl; Roger Locking coupling
US5700156A (en) * 1996-07-31 1997-12-23 The Whitaker Corporation Electrical connector with wire restraint
US6419519B1 (en) * 2000-08-01 2002-07-16 Glenair Inc. Strain relief for electrical connectors
EP1249914A1 (fr) * 2001-04-12 2002-10-16 Nexans Guide-câble pour boítier étanche et ensemble d'étanchéité comportant un tel guide
US20080299824A1 (en) * 2007-06-04 2008-12-04 Legg Ronald W Connector retainers and methods of securing a connector in a receptacle
US20090020656A1 (en) * 2007-07-16 2009-01-22 Mark Richard Cave Connector retainers and methods of securing a connector to a receptacle
US20090098762A1 (en) * 2007-10-10 2009-04-16 Tyco Electronics Corporation Wire clamp system for an electrical connector
US20090111321A1 (en) * 2007-10-24 2009-04-30 Amphenol Corporation Strain relief backshell assembly
US20090111319A1 (en) * 2007-10-24 2009-04-30 Amphenol Corporation Strain relief backshell assembly
US20090117775A1 (en) * 2006-11-02 2009-05-07 Timothy Lee Kocher Wire retention connector system
US20130122728A1 (en) * 2010-07-20 2013-05-16 Yazaki Corporation Connector
US11005211B2 (en) * 2018-10-29 2021-05-11 Tokyo Electron Limited Method for manufacturing cable with connector and cable with connector

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858960A (en) * 1973-06-04 1975-01-07 Amp Inc Strain relief means for electrical connectors
GB2136220B (en) * 1983-03-03 1986-03-05 Bicc Plc An electric plug assembly
DE4126135C1 (enrdf_load_stackoverflow) * 1991-08-07 1992-10-08 Atlas Elektronik Gmbh, 2800 Bremen, De
FR2734951B1 (fr) * 1995-06-02 1997-09-19 Labinal Dispositif de fixation de cablage a l'arriere d'un connecteur.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1245931A (en) * 1916-11-04 1917-11-06 Guy R Lanman Spark-plug protector.
US2047126A (en) * 1933-04-10 1936-07-07 Crouse Hinds Co Electric plug and socket
US3055971A (en) * 1959-09-25 1962-09-25 Gen Motors Corp Panel wiring assemblies
GB911713A (en) * 1960-06-22 1962-11-28 Light And Power Accessories Co Improvements in and relating to electrical plug and socket connectors
US3328748A (en) * 1964-07-20 1967-06-27 Pass & Seymour Inc Dead-front connector cap or cord connector with integrally molded cord grip

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1245931A (en) * 1916-11-04 1917-11-06 Guy R Lanman Spark-plug protector.
US2047126A (en) * 1933-04-10 1936-07-07 Crouse Hinds Co Electric plug and socket
US3055971A (en) * 1959-09-25 1962-09-25 Gen Motors Corp Panel wiring assemblies
GB911713A (en) * 1960-06-22 1962-11-28 Light And Power Accessories Co Improvements in and relating to electrical plug and socket connectors
US3328748A (en) * 1964-07-20 1967-06-27 Pass & Seymour Inc Dead-front connector cap or cord connector with integrally molded cord grip

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3732527A (en) * 1971-05-04 1973-05-08 T Mcknight Strain relief clamp
US3792417A (en) * 1972-08-23 1974-02-12 Bendix Corp Strain relief clamp for an electrical connector
US3828302A (en) * 1972-09-13 1974-08-06 Bunker Ramo Electrical connector and mounting means
US4070083A (en) * 1977-01-31 1978-01-24 Dipalma Joseph Electrical power line extension
DE3402919A1 (de) * 1984-01-28 1985-08-01 Messerschmitt-Bölkow-Blohm GmbH, 8012 Ottobrunn Endgehaeuse fuer einen steckverbinder
FR2558993A1 (fr) * 1984-01-28 1985-08-02 Messerschmitt Boelkow Blohm Boitier d'extremite antitraction pour connecteur electrique
US4917622A (en) * 1989-07-10 1990-04-17 Sundstrand Corporation Strain relief device for electrical cables
WO1991001052A1 (en) * 1989-07-10 1991-01-24 Sundstrand Corporation Strain relief device for electrical cables
US5368504A (en) * 1991-12-09 1994-11-29 Itt Corporation Shielded cable connector
EP0685908A1 (fr) * 1994-06-03 1995-12-06 Framatome Connectors International Dispositif serre-câbles formant raccord arrière pour connecteur
FR2720866A1 (fr) * 1994-06-03 1995-12-08 Framatome Connectors France Dispositif serre-câbles formant raccord arrière pour connecteur.
US5620334A (en) * 1994-06-03 1997-04-15 Framatome Connectors International Stress relief device for cables adapted to be removably attached to the rear of a connector
US5653605A (en) * 1995-10-16 1997-08-05 Woehl; Roger Locking coupling
US5700156A (en) * 1996-07-31 1997-12-23 The Whitaker Corporation Electrical connector with wire restraint
US6419519B1 (en) * 2000-08-01 2002-07-16 Glenair Inc. Strain relief for electrical connectors
FR2823610A1 (fr) * 2001-04-12 2002-10-18 Nexans Guide-cable pour boitier etanche et ensemble d'etancheite comportant un tel guide
US6605781B2 (en) 2001-04-12 2003-08-12 Nexans Cable guide for a sealed box, and a sealing assembly including such a guide
EP1249914A1 (fr) * 2001-04-12 2002-10-16 Nexans Guide-câble pour boítier étanche et ensemble d'étanchéité comportant un tel guide
US20090117775A1 (en) * 2006-11-02 2009-05-07 Timothy Lee Kocher Wire retention connector system
US20080299824A1 (en) * 2007-06-04 2008-12-04 Legg Ronald W Connector retainers and methods of securing a connector in a receptacle
US7559788B2 (en) 2007-06-04 2009-07-14 The Nielsen Company (Us), Llc Connector retainers and methods of securing a connector in a receptacle
US20090020656A1 (en) * 2007-07-16 2009-01-22 Mark Richard Cave Connector retainers and methods of securing a connector to a receptacle
US7563123B2 (en) 2007-07-16 2009-07-21 The Nielsen Company (Us), Llc Connector retainers and methods of securing a connector to a receptacle
US7618280B2 (en) 2007-10-10 2009-11-17 Tyco Electronics Corporation Wire clamp system for an electrical connector
US20090098762A1 (en) * 2007-10-10 2009-04-16 Tyco Electronics Corporation Wire clamp system for an electrical connector
US20090130894A1 (en) * 2007-10-24 2009-05-21 Amphenol Corporation Strain relief backshell assembly
US7544085B2 (en) 2007-10-24 2009-06-09 Amphenol Corporation Strain relief backshell assembly
US20090111319A1 (en) * 2007-10-24 2009-04-30 Amphenol Corporation Strain relief backshell assembly
US20090111321A1 (en) * 2007-10-24 2009-04-30 Amphenol Corporation Strain relief backshell assembly
US7837495B2 (en) 2007-10-24 2010-11-23 Amphenol Corporation Strain relief backshell assembly
US20130122728A1 (en) * 2010-07-20 2013-05-16 Yazaki Corporation Connector
US9070996B2 (en) * 2010-07-20 2015-06-30 Yazaki Corporation Connector
US11005211B2 (en) * 2018-10-29 2021-05-11 Tokyo Electron Limited Method for manufacturing cable with connector and cable with connector

Also Published As

Publication number Publication date
NL7005225A (enrdf_load_stackoverflow) 1970-10-13
JPS515737Y1 (enrdf_load_stackoverflow) 1976-02-17
IE33768L (en) 1970-10-11
DE7013225U (de) 1970-09-17
NL162257B (nl) 1979-11-15
DE2017322A1 (de) 1970-10-15
SE367740B (enrdf_load_stackoverflow) 1974-06-04
DE2017322C3 (de) 1981-01-08
IE33768B1 (en) 1974-10-30
GB1310156A (en) 1973-03-14
FR2043130A5 (enrdf_load_stackoverflow) 1971-02-12
DE2017322B2 (de) 1980-04-24

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