GB1198803A - Improvements in and relating to Methods of Making Bimetallic Rivet-Type Electrical Contacts - Google Patents

Improvements in and relating to Methods of Making Bimetallic Rivet-Type Electrical Contacts

Info

Publication number
GB1198803A
GB1198803A GB3359866A GB3359866A GB1198803A GB 1198803 A GB1198803 A GB 1198803A GB 3359866 A GB3359866 A GB 3359866A GB 3359866 A GB3359866 A GB 3359866A GB 1198803 A GB1198803 A GB 1198803A
Authority
GB
United Kingdom
Prior art keywords
billet
die
head
plunger
contact
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
Application number
GB3359866A
Inventor
Donald Gordon Billington
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.)
Johnson Matthey PLC
Original Assignee
Johnson Matthey PLC
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 Johnson Matthey PLC filed Critical Johnson Matthey PLC
Priority to GB3359866A priority Critical patent/GB1198803A/en
Publication of GB1198803A publication Critical patent/GB1198803A/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Switches (AREA)

Abstract

1,198,803. Making electrical contact rivets; forging; extruding. JOHNSON MATTHEY & CO. Ltd. 12 July, 1967 [26 July, 1966], No. 33598/66. Headings B3A, B3H and B3P. A trimetallic rivet-type electrical contact is made by deforming a bimetallic billet to form an extruded shank and a forged head, the original cross-sectional area of the billet being greater than the cross-sectional area of the shank but less than the maximum cross-sectional area of the head. In one embodiment, Figs. 9 and 11, a billet 18 consisting of a copper cylinder 19 bonded to a silver cylinder 20, is partly extruded to form the shank, after which the blank is transferred to a die block 24 and the head 28 cold formed by a tool 27. In another embodiment, an extrusion die 36, Fig. 12, is moved downwards to extrude a shank from the billet 30 located on a plunger 35 in a spring-loaded die 32. After the billet has been expelled from the die 32 by the plunger 35, the extrusion die 36 carrying the partly formed contact is moved laterally and then downwards on to a cold forging die (41) (Fig. 15, not shown) to deform the unextruded part of the billet into the head. The contact head is removed from the forging die (41) by a plunger (43) and the contact expelled from the extrusion die 36 by a plunger 37. The contact head may be other than cylindrical such as square, frusto-conical or part spherical, or may be elliptical shaped, formed from a billet of rectangular section.
GB3359866A 1966-07-26 1966-07-26 Improvements in and relating to Methods of Making Bimetallic Rivet-Type Electrical Contacts Expired GB1198803A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3359866A GB1198803A (en) 1966-07-26 1966-07-26 Improvements in and relating to Methods of Making Bimetallic Rivet-Type Electrical Contacts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3359866A GB1198803A (en) 1966-07-26 1966-07-26 Improvements in and relating to Methods of Making Bimetallic Rivet-Type Electrical Contacts

Publications (1)

Publication Number Publication Date
GB1198803A true GB1198803A (en) 1970-07-15

Family

ID=10354994

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3359866A Expired GB1198803A (en) 1966-07-26 1966-07-26 Improvements in and relating to Methods of Making Bimetallic Rivet-Type Electrical Contacts

Country Status (1)

Country Link
GB (1) GB1198803A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0062248A1 (en) * 1981-03-28 1982-10-13 DODUCO KG. Dr. Eugen Dürrwächter Method of producing trimetallic contact rivets
EP0062243A1 (en) * 1981-03-28 1982-10-13 DODUCO KG. Dr. Eugen Dürrwächter Method of producing bimetallic contact rivets
US5020217A (en) * 1990-02-06 1991-06-04 General Electric Company Methods for fabricating an electrical contact

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0062248A1 (en) * 1981-03-28 1982-10-13 DODUCO KG. Dr. Eugen Dürrwächter Method of producing trimetallic contact rivets
EP0062243A1 (en) * 1981-03-28 1982-10-13 DODUCO KG. Dr. Eugen Dürrwächter Method of producing bimetallic contact rivets
US5020217A (en) * 1990-02-06 1991-06-04 General Electric Company Methods for fabricating an electrical contact

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees