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Electrical devices

  • US 4,376,238 A
  • Filed: 03/11/1981
  • Issued: 03/08/1983
  • Est. Priority Date: 03/12/1980
  • Status: Expired due to Fees
First Claim
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1. A switch assembly including a base member, at least one pair of conductors provided upon the base member and which are to be electrically connected, an elastomeric membrane extending over the base member, the membrane having at least one portion belled outwardly away from the base member to define a cavity beneath the membrane and being so positioned as to overly at least two separate pairs of conductors to be electrically connected, each said belled out portion of the membrane having a circumscribing region of such characteristics that on exerting pressure on the portion to collapse said portion towards the base member, said circumscribing region is first to collapse, each said portion also including first and second conductive contactor elements positioned as to be electrically connectable with the first and second pairs of the electrical conductor pairs and so located relative to the circumscribing region that on exerting pressure upon the membrane to collapse said portion towards the base member, said first and second conductive contactor contact elements are caused successively to contact the associated first and second pairs of conductors.

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