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Drape sensor

  • US 5,856,644 A
  • Filed: 01/08/1997
  • Issued: 01/05/1999
  • Est. Priority Date: 04/27/1995
  • Status: Expired due to Fees
First Claim
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1. In combination:

  • a) a door having an edge; and

    b) attached to the door edge and depending therefrom, a freely and flaccidly hanging pressure actuated switching device which includesfirst and second conductive layers,a layer of compressible and conductive piezoresistive material for making electrical contact between first and second conductive layers, andat least one insulative spacer means for spacing apart said piezoresistive material and said second conductive layer, said spacer means having open spaces to permit passage therethrough of at least a portion of the piezoresistive material,wherein in response to a predetermined amount of force applied thereto at least some of said piezoresistive material disposes itself through at least some of said open spaces to make electrical contact with said second conductive layer.

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