US3737839A - Connector terminal having a contact socket assembly for receiving the end of a conductor - Google Patents

Connector terminal having a contact socket assembly for receiving the end of a conductor Download PDF

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Publication number
US3737839A
US3737839A US00239714A US3737839DA US3737839A US 3737839 A US3737839 A US 3737839A US 00239714 A US00239714 A US 00239714A US 3737839D A US3737839D A US 3737839DA US 3737839 A US3737839 A US 3737839A
Authority
US
United States
Prior art keywords
contact
socket assembly
nut
contact socket
conductor
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
US00239714A
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English (en)
Inventor
G Marechal
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.)
Individual
Original Assignee
Individual
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
Priority claimed from FR7028749A external-priority patent/FR2102450A5/fr
Priority claimed from FR7111094A external-priority patent/FR2131031A5/fr
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3737839A publication Critical patent/US3737839A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/36—Conductive members located under tip of screw
    • H01R4/363—Conductive members located under tip of screw with intermediate part between tip and conductive member
    • H01R4/366—Conductive members located under tip of screw with intermediate part between tip and conductive member intermediate part attached to the tip of the screw
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/36—Conductive members located under tip of screw
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/39—Cord and rope holders
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/70—Interfitted members
    • Y10T403/7041—Interfitted members including set screw

Definitions

  • This invention relates to connector terminals of the type having at least one integral contact socket assembly for receiving the stripped end of a conductor, such as a multi-strand cable.
  • a resilient member made for example of spring steel, is sandwiched between the conductor and the lower face of the projecting head of the setscrew.
  • the conductor is subjected to an increasing elastic pressure. Thereafter, the end of the screw comes into contact with the resilient member and starts a direct clamping which continues until the locking of the conductor is achieved.
  • the resilient member then assumes a role analogous to that of a resilient washer and opposes an accidental loosening of the screw.
  • Another arrangement for resiliently locking and clamping a conductor comprises a screw crossing freely the casing of the contact socket through an opening.
  • the screw is in engagement with a nut situated on the exterior of the clamping socket and maintained against the latter by a non-deformable yoke applied to the lateral face of the clamping socket opposite said opening.
  • the yoke has a planar face provided with an aperture for the passage of the screw while a resilient washer is interposed between the nut and the aid planar face of the yoke.
  • the nut and the screw are made of steel. At the end of the clamping operation, the screw withdraws slightly from the contact socket by compressing the elastic washer against the-planar face of the yoke.
  • the contact socket assembly comprises a screw freely transversing the socket body through ,a lateral opening provided therein and cooperating with an externally situated nut.
  • the latter is held against the contact socket body by a resilient band, preferably of spring steel, applied against the lateral face of the contact socket opposite the opening and against the external face of the nut.
  • the resilient band is provided with an aperture aligned with the base of said nut.
  • FIG. 1 is a longitudinal section of a contact socket assembly according to the invention
  • FIG. 2 is an end elevational view of the assembly shown in FIG. 1 taken from the right;
  • FIG. 3 is a perspective view of one component of the same assembly
  • FIG. 4 is a longitudinal section of a female terminal incorporating the assembly shown in FIGS. l-3;
  • FIG. 5 is a view similar to that of FIG. 4, showing the structure in an alternate position and FIGS. 6 and 7 are schematic and elevational views of two operational positions of a form for preshaping a braided conductor.
  • an electric terminal 1 here a male plug or jack, has at one end an integral socket body 2 which forms part of a contact socket assembly and which has an open-ended axial bore 2a. The latter receives the bared end of an electrical conductor having twisted strands (not shown).
  • the socket body 2 comprises an external planar surface portion 3, having a circular aperture 4 centered on the longitudinal axis of the surface portion 3.
  • the contact socket assembly further comprises a nut 6 which has a rectangular base 10 and an external face 12.
  • the latter is cylindrical and has an axis which is parallel to the longer center line of the rectangular base 10.
  • the base 10 which is designed to be placed on the planar surface portion 3 of the socket body 2 comprises at its middle portion, a recess 1 l which, in the example shown, forms a broad transversal channel.
  • the external face 12 of the nut 6 has at its center a cylindrical protrusion 9 traversed axially by a threaded nut bore.
  • the nut 6 cooperates with a headless screw 5 designed for clamping the conductor and which, at its extremity inside the axial recess 2a carries a disc 13 having a slightly convex work face 14.
  • the diameter of the disc 13 is slightly smaller than that of the circular aperture 4.
  • the depth and the width of the channel 1 1 in the nut 6 are such that the disc 13 may be entirely withdrawn thereinto without protruding beyond the plane of the base 10.
  • the contact socket assembly further includes a strip of rolled spring steel forming a resilient band 7 designed to maintain the nut 6 securely on the planar surface portion 3 of the socket body 2.
  • the band 7 has an oval cross section and is applied respectively against the lateral surface of the socket body 2 diametrically opposite the planar surface portion 3 and against the external face 12 of the nut 6, at the two ends of the major axis of the oval.
  • the band 7 is provided with an opening to receive the protrusion 9 of the nut 6.
  • the last-named opening is provided in the two thicknesses of the band which overlap after formation of the closed band. This arrangement provides a fixation of the two extremites of the band and avoids the necessity of joining the overlapping layers by soldering or the like.
  • the components of the contact socket are assembled as follows: The screw 5 is threaded into the nut 6 from the side of its base until the disc 13 entirely nests in the recess 11. Then, the screw-and-nut assembly is introduced into the band 7 in such a manner that the slot ted end of the screw 5 and then the projection 9 pass through the opening in the wall of the band 7. Thereupon the latter is inserted onto the socket body 2, while the base 10 of the nut 6 glides on the planar surface portion 3 of the socket body 2. A few turns of the screw 5 suffice for the disc 13 to reach or pass through the aperture 4, whereupon the assembly of components 5, 6, 7 can no longer be separated from the socket body 2.
  • the screw 5 is turned inwardly which brings the face 14 of the disc 13 against the conductor.
  • the advancement of the screw is effected perpendicularly to the axis of the socket bore 2a.
  • a further tightening of the screw 5 will cause a movement of the nut 6 away from the socket body 2, resulting in a deformation of the resilient band 7.
  • the convex form of the work face 14 of the screw 5 enhances its penetration into the conductor.
  • the convex face 14 bites into the conductor spreading the strands without harming them and forcefully presses them against the internal surface of the contact socket assuring an almost individual contact between each strand, on the one hand, and the inner wall of easing 2, on the other hand.
  • the stripped end of the latter may be tinned and the setscrew 5 with disc 13 annealed or silver-plated.
  • FIGS. 4 and 5 there is shown a female terminal 15 adapted to receive a prong or jack 23 of a male terminal 24.
  • the terminal 15 incorporates a contact socket assembly 19, 31, identical in structure and in operation to the assembly described hereinabove in connection with FIGS. 1-3. Accordingly, to the terminal 15 there is secured, by means of the contact socket assembly 19, 31 a conductor by its stripped end 20.
  • the socket body 19 has a crimping jaw 16 which holds one end of a tubular metallic braiding 17 disposed coaxially in a shaft 21 of the terminal base 22.
  • the crimping jaw 16 is annealed and outwardly flared.
  • the other end of the braiding 17 is affixed to a similar crimping jaw integral with a contact head 26 provided at its end with a silver or silverplated rivet 28.
  • a helicoidal spring 18 under compression, urging the contact head 26 into engagement with an inner annular shoulder 27 of the terminal base 22 in the absence of the prong 23.
  • Each strand of the braiding 17 is tinned at least at its end.
  • the diameter of the shaft 21 and the coil spring 18 is so designed as to allow a free ballooning of the braiding-l7 when the head 26 moves inwardly.
  • each of its ends are preshaped.
  • each end is placed in a mold 30 having a channel of semicircular bottom and a width substantially equal to the smallest inner diameter of the crimping jaws 16, 29.
  • the braiding then takes a substantially oval cross sectional shape (FIG. 6).
  • a punch 32, the working surface of which is a corresponding semicircular groove, is then lowered (FIG. 7) to give the end of the braiding a circular cross section of small diameter. At the same time, this operation produces an increase in the thickness of the wall of the tubular braiding.
  • the ends of the braiding are then coated with conducting grease to correct any damage that might have been caused by the preshaping operation to the tinning of some of the strands.
  • the braid ends are then introduced respectively into the crimping jaws 16 and 29.
  • the clamping is effected in a known manner.
  • the clamping jaws are deformed circularly, or preferably hexagonally in order that the braiding be in alignment with the contacts.
  • each crimping jaw is punched at diametrically opposite locations to provide clamping deformations such as indicated at 33 on the crimping jaw 16 and at 34 on the crimping jaw 29.
  • a structure as described in connection with FIGS. 4 and 5 improves the parasite contacts which appear in every electric connection and consequently reduces an ohmic voltage drop and thus the joule-type heat effect.
  • the aforenoted pressure contact-type structure has to be further improved for currents of more than amperes.
  • the invention provides a spring which is made of a metal having the necessary resilient characteristics and has, in addition, a very small magnetic susceptibility.
  • the INOX 12 R non-magnetic steel yields very satisfactory results.
  • the current intensity was 125 A
  • the spring 18 had 18 turns of a wire of 3.14 mm cross section.
  • the temperatures were taken at the base of the crimping jaw carried by the head 26.
  • the latter is preferably used in the zone of half-compressed state instead of using it in the zone of its relaxed state. Consequently, even in the absence of the prong 23, significant residual elastic forces will be present which normally would cause an elongation of the braiding 17, a deterioration of the connection of the braiding 17 in the crimping jaws and eventually a deterioration of the braiding itself. For avoiding these harmful effects, the expansion of the spring 18 has to be limited.
  • the shaft 21 terminates in an inwardly extending radial shoulder 27 against which as set forth earlier the contact head 26 abuts under spring pressure in the absence of an external counterforce. In this manner the movement of the contact head 26 and thus the expansion of the spring 18 is outwardly limited. By virtue of this arrangement it is effectively prevented that at any time the force of the spring is transmitted to the braiding 17. Such an occurrence would cause an undesired elongation of the braiding l7 and a weakening of its crimped connections.
  • a contact socket assembly for clamping an electric conductor comprising,
  • I said axial bore.
  • a contact socket assembly as defined in claim l2

Landscapes

  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
US00239714A 1970-08-04 1972-03-30 Connector terminal having a contact socket assembly for receiving the end of a conductor Expired - Lifetime US3737839A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7028749A FR2102450A5 (de) 1970-08-04 1970-08-04
FR7111094A FR2131031A5 (de) 1971-03-30 1971-03-30

Publications (1)

Publication Number Publication Date
US3737839A true US3737839A (en) 1973-06-05

Family

ID=26215883

Family Applications (1)

Application Number Title Priority Date Filing Date
US00239714A Expired - Lifetime US3737839A (en) 1970-08-04 1972-03-30 Connector terminal having a contact socket assembly for receiving the end of a conductor

Country Status (5)

Country Link
US (1) US3737839A (de)
JP (1) JPS545115B1 (de)
AU (1) AU464623B2 (de)
DE (1) DE2138715C3 (de)
GB (1) GB1354916A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3864005A (en) * 1973-10-11 1975-02-04 Gen Electric Resilient electrical terminal connector
US5470795A (en) * 1994-02-25 1995-11-28 Shushurin; Vladimir V. Method of connecting terminals of a plastic-encapsulated power transistor to a printed-circuit board
US6276865B1 (en) * 1998-10-30 2001-08-21 The Torrington Company Steering column shaft clamp
US20050239313A1 (en) * 2004-04-21 2005-10-27 Riospring, Inc. Reinforcement of electrical connections in electronic devices
US20090053940A1 (en) * 2007-08-24 2009-02-26 Ilsco Corporation Screw Assembly for Electrical Connectors
US9068587B2 (en) 2013-09-20 2015-06-30 Greatbach Ltd. Set screw apparatus
US9929477B2 (en) 2015-04-30 2018-03-27 Ilsco Corporation Torque limited screw for electrical connector
US20190016514A1 (en) * 2017-07-11 2019-01-17 Conti-Bros, Inc. Cold pack assembly
USD853968S1 (en) 2017-09-11 2019-07-16 Eaton Intelligent Power Limited Electrical switch rated connector
US10833430B2 (en) * 2018-09-13 2020-11-10 Schneider Electric Industries Sas Terminal for connecting an electrical conductor to the connection pad of an electrical device, and electrical protection device including such a terminal

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6268092U (de) * 1985-10-19 1987-04-28
DE29816667U1 (de) 1998-09-16 1998-12-03 Siemens AG, 80333 München Elektrische Anschlußklemme
DE102015209301A1 (de) * 2015-05-21 2016-11-24 Em-Motive Gmbh Steckerbuchse zur Aufnahme eines mehrphasigen Steckers
PL3367507T3 (pl) * 2017-02-23 2021-07-19 Jean Müller GmbH Elektrotechnische Fabrik Zacisk do podłączenia przewodu elektrycznego do szyny elektrycznej

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1266440A (en) * 1917-05-22 1918-05-14 Morris F Finkelstein Tap-connector for electric conductors.
US2134623A (en) * 1937-03-09 1938-10-25 Russell E Rowe Battery terminal connecter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1266440A (en) * 1917-05-22 1918-05-14 Morris F Finkelstein Tap-connector for electric conductors.
US2134623A (en) * 1937-03-09 1938-10-25 Russell E Rowe Battery terminal connecter

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3864005A (en) * 1973-10-11 1975-02-04 Gen Electric Resilient electrical terminal connector
US5470795A (en) * 1994-02-25 1995-11-28 Shushurin; Vladimir V. Method of connecting terminals of a plastic-encapsulated power transistor to a printed-circuit board
US6276865B1 (en) * 1998-10-30 2001-08-21 The Torrington Company Steering column shaft clamp
US20050239313A1 (en) * 2004-04-21 2005-10-27 Riospring, Inc. Reinforcement of electrical connections in electronic devices
US20090053940A1 (en) * 2007-08-24 2009-02-26 Ilsco Corporation Screw Assembly for Electrical Connectors
US7699669B2 (en) * 2007-08-24 2010-04-20 Ilsco Corporation Screw assembly for electrical connectors
US9068587B2 (en) 2013-09-20 2015-06-30 Greatbach Ltd. Set screw apparatus
US10047782B2 (en) 2013-09-20 2018-08-14 Nuvectra Corporation Set screw apparatus
US9929477B2 (en) 2015-04-30 2018-03-27 Ilsco Corporation Torque limited screw for electrical connector
US20190016514A1 (en) * 2017-07-11 2019-01-17 Conti-Bros, Inc. Cold pack assembly
USD853968S1 (en) 2017-09-11 2019-07-16 Eaton Intelligent Power Limited Electrical switch rated connector
US10833430B2 (en) * 2018-09-13 2020-11-10 Schneider Electric Industries Sas Terminal for connecting an electrical conductor to the connection pad of an electrical device, and electrical protection device including such a terminal

Also Published As

Publication number Publication date
DE2138715A1 (de) 1972-02-10
DE2138715B2 (de) 1975-01-02
JPS545115B1 (de) 1979-03-13
AU464623B2 (en) 1975-09-04
DE2138715C3 (de) 1975-08-14
GB1354916A (en) 1974-06-05
AU3182571A (en) 1973-02-01

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