Key switch

  • US 5,144,103 A
  • Filed: 03/01/1991
  • Issued: 09/01/1992
  • Est. Priority Date: 03/09/1990
  • Status: Expired due to Term
First Claim
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1. A key switch comprising:

  • a key operator having an operation unit for operating a key, a shaft unit positioning below the operating unit, and a claw unit extending outside of the shaft unit;

    a frame having a guide unit for guiding the shaft unit of said key operator in a predetermined direction, a first lower surface formed at the outer periphery of the guide unit, and a second lower surface formed at the outer periphery of the first lower surface;

    a circuit forming device having a fixed contact andan elastic sheet member having a base portion sandwiched between the second lower surface of said frame and the upper surface of said circuit forming device, a dome portion projecting from the base portion and having an upper end for pushing up the lower end of the shaft unit of said key operator, and an upper end portion formed at the outer periphery of the dome portion and projecting from the base portion, the upper end portion being sandwiched between the first lower surface of said frame and the upper surface of the claw unit of said key operator.

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