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Pressure sensitive switch

  • US 5,965,856 A
  • Filed: 11/28/1997
  • Issued: 10/12/1999
  • Est. Priority Date: 11/28/1996
  • Status: Expired due to Term
First Claim
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1. A pressure sensitive seating switch adapted to be internally housed in a vehicle seat comprising:

  • a first flat resilient film of an insulating material carrying a flat conductive layer on its flat reverse surface;

    a spacer of an insulating material having an opening of an increased area as compared with the thickness thereof and extending through the spacer in the direction of thickness, the spacer having one of its front and reverse surfaces jointed to the reverse surface of the first film;

    a second flat resilient film of an insulating material carrying a flat conductive layer on its reverse surface, which is joined to the other of the front and the reverse surface of the spacer; and

    a first and a second lead wire connected to the conductive layers on the first and the second films, respectively;

    wherein at least one of the first and the second films is formed of polyethylene naphthalate and a ratio of the size of the opening to the spacer thickness is chosen for flexing the films to bring the conductive layers into contact with each other by a force which is greater than a given value while both films are maintained apart due to the resilience of the films to keep the conductive layers spaced from each other when a force is below the given value.

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