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Detector for alarm system

  • US 4,075,616 A
  • Filed: 11/12/1975
  • Issued: 02/21/1978
  • Est. Priority Date: 11/12/1975
  • Status: Expired due to Term
First Claim
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1. A switching device comprising an elongate flexible cable-like tubular carrier of insulating material of undefined length, sensing means occupying the full volume of said carrier and extending longitudinally substantially the entire length thereof, said sensing means comprising a fibrous, flexible, resilient mass of insulating material having a pair of uninsulated conducting wires spirally intertwined longitudinally therethrough in opposed spaced apart relationship, each point of one of said pair of conducting wire being disposed opposite a point on the other of said pair of conducting wires, the insulating material separating and insulating said conducting wires one from the other, said mass of insulating material being permeable to permit said conducting wires to penetrate said mass to thereby engage each other in response to an applied force transversely of the carrier in any direction and at any point, said mass being resilient for effecting restoration of said spaced relationship when the applied force is removed.

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