(19)
(11) EP 0 365 879 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
03.07.1991 Bulletin 1991/27

(43) Date of publication A2:
02.05.1990 Bulletin 1990/18

(21) Application number: 89118329.5

(22) Date of filing: 03.10.1989
(51) International Patent Classification (IPC)5: H01H 1/02, H01H 11/04
(84) Designated Contracting States:
DE FR GB

(30) Priority: 03.10.1988 JP 249522/88
17.01.1989 JP 8092/89
24.08.1989 JP 217752/89

(71) Applicants:
  • FUJI ELECTRIC CO., LTD.
    Kawasaki-shi Kanagawa 210 (JP)
  • Tokuriki Honten Company Limited
    Chiyoda-ku Tokyo (JP)

(72) Inventors:
  • Sunaga, Mitsuo c/o Fuji Electric Co., Ltd.
    Kawasaki-shi Kanagawa (JP)
  • Sekiguchi, Kiyoshi c/o Fuji Electric Co., Ltd.
    Kawasaki-shi Kanagawa (JP)
  • Shinohara, Hisaji c/o Fuji Electric Co., Ltd.
    Kawasaki-shi Kanagawa (JP)
  • Takahashi, Akihiro c/o Fuji Electric Co., Ltd.
    Kawasaki-shi Kanagawa (JP)
  • Hikita, Hiroshi c/o Fuji Electric Co., Ltd.
    Kawasaki-shi Kanagawa (JP)
  • Nara, Takashi c/o Tokuriki Honten Co., Ltd.
    Chiyoda-ku Tokyo (JP)
  • Sato, Sadao c/o Tokuriki Honten Co., Ltd.
    Chiyoda-ku Tokyo (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Maximilianstrasse 58
80538 München
80538 München (DE)


(56) References cited: : 
   
       


    (54) Electric contact with base metal


    (57) An electric contact with a base metal used as a switch wherein the non-welded peripheral portion of the contact is prevented from bow-like bonding and from peeling off. The electric contact with a base metal having a contact promoting shapeis is formed by die forging of a contact material joined to the base metal by resistance welding. The composite contact material is prepared by coating the core material of Ag-oxide contact material with non-oxide contact material. The side of the material in contact with the base metal is of non-oxide contact material. The contact material may be pressed to fill a groove preformed in the base metal, welded to protrusions preformed in the base metal, welded to the bottom of a cut preformed in the base metal, or welded to bottoms of recesses preformed in the base metal.







    Search report