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Oscillation switch and a portable electrically driving machine with the oscillation switch

  • US 5,747,762 A
  • Filed: 11/21/1996
  • Issued: 05/05/1998
  • Est. Priority Date: 05/24/1994
  • Status: Expired due to Term
First Claim
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1. An oscillation switch comprising an annular member electrically insulated at at least both end portions thereof, a pair of disc-shaped electrodes provided on said both end portions of said annular member and having opposed inner surfaces separated from each other at a distance and defining a space therebetween, each of said inner surfaces having a central portion, a projection formed on said central portion of said inner surface of at least one of said disc-shaped electrodes, said distance being a minimum substantially between said central portions of said inner surfaces of said electrodes, said inner surface of the other electrode being undepressed, and a plurality of balls made of an electrically conducting material and disposed in said space, each of said balls having a diameter larger than said minimum distance and smaller than a distance between opposed portions of said disc-shaped electrodes with which said projection is not provided.

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