US3650026A - Method of forming a contact - Google Patents

Method of forming a contact Download PDF

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Publication number
US3650026A
US3650026A US846710A US3650026DA US3650026A US 3650026 A US3650026 A US 3650026A US 846710 A US846710 A US 846710A US 3650026D A US3650026D A US 3650026DA US 3650026 A US3650026 A US 3650026A
Authority
US
United States
Prior art keywords
contact
wire
welded
covering
gold
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
US846710A
Other languages
English (en)
Inventor
Albert Leslie Freeman
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.)
STC PLC
Original Assignee
International Standard Electric 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 International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US3650026A publication Critical patent/US3650026A/en
Assigned to STC PLC reassignment STC PLC ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INTERNATIONAL STANDARD ELECTRIC CORPORATION, A DE CORP.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H01H11/041—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by bonding of a contact marking face to a contact body portion
    • 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
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49204—Contact or terminal manufacturing
    • Y10T29/49208—Contact or terminal manufacturing by assembling plural parts
    • Y10T29/4921—Contact or terminal manufacturing by assembling plural parts with bonding
    • Y10T29/49211—Contact or terminal manufacturing by assembling plural parts with bonding of fused material
    • Y10T29/49213—Metal

Definitions

  • a method of manufacturing an electrical contact includes the steps of welding the end of a coated contact wire to a strip of spring metal, severing the welded end of the wire from the remainder of the wire by means of a pair of pinching cutters to leave a chisel-ended stud welded to the spring strip and shaping the stud by impact of a shaped die to produce a shaped contact.
  • the wire is gold coated silver wire, and the die is domeshaped.
  • contacts made by the above method have a satisfactory gold coating by virtue of the fact that the pinching cutters tend to draw the gold coating on the wire across the cut surface and this drawn gold film remains even after the die-shaping operation.
  • the invention therefore provides a contact consisting of a shaped contact body welded to a strip of spring metal, the contact body being covered with a protective film.
  • FIG. 1 is a cross section illustrating the cutting operation in the manufacture of a relay contact
  • FIG. 2 is a cross section illustrating the finished relay contact.
  • a length of silver wire 1 (FIG. 1) is butt welded by a resistance or capacitor welding operation to a strip of spring metal 2.
  • the wire 1 is gold coated, the gold coating 3 being continuous.
  • the silver is welded directly to the spring 2, there is no gold between the two.
  • the gold coating 3 is only in contact with the spring 2 around the circumference of the weld.
  • a pair of pinching cutters (not shown) are used to sever the welded end 4 of the wire from the supply length. The pinching action of the cutters not only leaves a chisel edged stud 4 welded to the spring, it also draws" the gold coating from the edge of the cut wire towards the middle 5, or apex," of the cut.
  • the welded stud 4 When the wire has been cut the welded stud 4 is placed under a concave dome shaped die (not shown) and coined. The result is to cold work the chisel edged stud of FIG. 1 into a hemispherical contact 6 (FIG. 2) still welded to the spring 2.
  • the punching operation also works the drawn gold coating 7 and leaves it as a hemispherical coating completely covering the contact 6.
  • the flow of metal is such that on the apex of the contact the gold covering 7 is very thin whereas towards the base of the contact it remains thicker.
  • the only function of the gold is to prevent tarnishing the thinness of the coating is immaterial.
  • the gold film is destroyed; it is not designed to withstand normal operation of the contacts.
  • the shape of the die can be other than hemispherical provided .it is not shaped so that it can cause any significant rupturing of the protective coating.
  • a method of manufacturing an electrical contact having a thin protective covering of another metal on the contact surface including the steps of welding the end of a anothermetal to a strip of spring contact wire coated with metal, severing the welded end of the wire from the remainder of the wire by forcing a pair of pinching cutters through the cross section thereof and contemporaneously drawing a covering of said another metal across the severed area during the severing process to leave a covered chisel-ended stud welded to the spring strip, and shaping the said covered chiselended stud by impacting same with a shaped die to form a contact having a covering of the said other metal over a contoured surface.
  • coated contact wire is gold coated silver wire and the covering over the contoured surface is a covering of gold.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Switches (AREA)
US846710A 1968-08-21 1969-08-01 Method of forming a contact Expired - Lifetime US3650026A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB39925/68A GB1170186A (en) 1968-08-21 1968-08-21 Relay Contacts and Method of Manufacture of Same.

Publications (1)

Publication Number Publication Date
US3650026A true US3650026A (en) 1972-03-21

Family

ID=10412237

Family Applications (1)

Application Number Title Priority Date Filing Date
US846710A Expired - Lifetime US3650026A (en) 1968-08-21 1969-08-01 Method of forming a contact

Country Status (10)

Country Link
US (1) US3650026A (de)
AT (1) AT303179B (de)
BE (1) BE737755A (de)
CA (1) CA918898A (de)
CH (1) CH497772A (de)
DE (1) DE1941475A1 (de)
ES (1) ES370625A1 (de)
FR (1) FR2016047A1 (de)
GB (1) GB1170186A (de)
NL (1) NL6912729A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941969A (en) * 1973-08-09 1976-03-02 E. I. Du Pont De Nemours And Co. Apparatus and process for applying contact dots
US5458158A (en) * 1993-03-30 1995-10-17 Toyo Communication Equipment Co., Ltd. Lead cutting apparatus and an anticorrosive coat structure of lead
US6006933A (en) * 1998-04-23 1999-12-28 Product Investment, Inc. Twist-off closure
US20040178481A1 (en) * 2003-03-10 2004-09-16 Rajeev Joshi Dual metal stud bumping for flip chip applications

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1081451A (en) * 1913-03-31 1913-12-16 Charles H Kerk Process of making platinum-covered pins.
US2739370A (en) * 1952-03-28 1956-03-27 Metals & Controls Corp Method of making electrical contacts
US3191272A (en) * 1960-03-02 1965-06-29 Talon Inc Method of making an electrical contact
US3485994A (en) * 1966-10-12 1969-12-23 Western Electric Co Apparatus for resistance welding spaced contact elements onto a strip of material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1081451A (en) * 1913-03-31 1913-12-16 Charles H Kerk Process of making platinum-covered pins.
US2739370A (en) * 1952-03-28 1956-03-27 Metals & Controls Corp Method of making electrical contacts
US3191272A (en) * 1960-03-02 1965-06-29 Talon Inc Method of making an electrical contact
US3485994A (en) * 1966-10-12 1969-12-23 Western Electric Co Apparatus for resistance welding spaced contact elements onto a strip of material

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941969A (en) * 1973-08-09 1976-03-02 E. I. Du Pont De Nemours And Co. Apparatus and process for applying contact dots
US5458158A (en) * 1993-03-30 1995-10-17 Toyo Communication Equipment Co., Ltd. Lead cutting apparatus and an anticorrosive coat structure of lead
US5675127A (en) * 1993-03-30 1997-10-07 Toyo Communication Equipment Co., Ltd. Anticorrosive coat structure of lead
US6006933A (en) * 1998-04-23 1999-12-28 Product Investment, Inc. Twist-off closure
US20040178481A1 (en) * 2003-03-10 2004-09-16 Rajeev Joshi Dual metal stud bumping for flip chip applications
WO2004081990A3 (en) * 2003-03-10 2005-03-31 Fairchild Semiconductor Coated metal stud bump formed by a coated wire for flip chip
US20060189116A1 (en) * 2003-03-10 2006-08-24 Rajeev Joshi Dual metal stud bumping for flip chip applications
US7271497B2 (en) 2003-03-10 2007-09-18 Fairchild Semiconductor Corporation Dual metal stud bumping for flip chip applications
US7501337B2 (en) * 2003-03-10 2009-03-10 Fairchild Semiconductor Corporation Dual metal stud bumping for flip chip applications
US20090186452A1 (en) * 2003-03-10 2009-07-23 Rajeev Joshi Dual metal stud bumping for flip chip applications
US7932171B2 (en) 2003-03-10 2011-04-26 Fairchild Semiconductor Corporation Dual metal stud bumping for flip chip applications

Also Published As

Publication number Publication date
FR2016047A1 (de) 1970-04-30
BE737755A (de) 1970-02-23
CA918898A (en) 1973-01-16
ES370625A1 (es) 1971-07-01
GB1170186A (en) 1969-11-12
DE1941475A1 (de) 1970-02-26
NL6912729A (de) 1970-02-24
AT303179B (de) 1972-11-10
CH497772A (de) 1970-10-15

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Legal Events

Date Code Title Description
AS Assignment

Owner name: STC PLC,ENGLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:INTERNATIONAL STANDARD ELECTRIC CORPORATION, A DE CORP.;REEL/FRAME:004761/0721

Effective date: 19870423

Owner name: STC PLC, 10 MALTRAVERS STREET, LONDON, WC2R 3HA, E

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INTERNATIONAL STANDARD ELECTRIC CORPORATION, A DE CORP.;REEL/FRAME:004761/0721

Effective date: 19870423