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Membrane switch

  • US 4,356,358 A
  • Filed: 07/01/1981
  • Issued: 10/26/1982
  • Est. Priority Date: 07/01/1981
  • Status: Expired due to Term
First Claim
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1. A membrane switch device of the type comprising a first membrane switch having a sheet of flexible insulating film with side edges and first and second end edges, conductors and switch electrodes on one surface of said sheet, a first fold line located substantially midway between said end edges and extending normally of said side edges, said sheet being folded along said fold line so that said end edges coincide and said sheet is divided into two parallel sections with the first surface on each section opposed to the first surface on the other section and with said switch electrodes opposed to each other, first separator means between said opposed first surfaces which maintains said surfaces in spaced-apart relationship, said separator means permitting relative movement of said electrodes towards and against each other, and a tail extending from said first end edge, said conductors extending onto said tail, said switch device being characterized in that:

  • a second sheet of film is integral with said first sheet of film, said second sheet of film extending from said second end edge of said first sheet, a slit is provided between said first sheet and said second sheet, said tail being inserted through said slit,said second sheet of film having side edges and having an end edge which is remote from said first sheet, said second sheet being folded along a second sheet fold line which extends parallel to said first fold line to form a second membrane switch which is similar to said first membrane switch and which has opposed surfaces on which are provided second conductors and second opposed switch electrodes with a second separator means,said second membrane switch being folded as a unit along said second edge of said first sheet whereby said first switch and said second switch are in parallel planes.

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