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Flexible fiber optic tying member for theftproof device

  • US 4,574,192 A
  • Filed: 09/19/1984
  • Issued: 03/04/1986
  • Est. Priority Date: 11/16/1981
  • Status: Expired due to Term
First Claim
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1. An elongate flexible tying member having an optical fiber longitudinally extending through said flexible tying member and a pair of optoelectric elements arranged at opposite ends of said optical fiber, one of said optoelectric elements being a light source and the other of said optoelectric elements being a light receptor, for use in a theftproof device including means responsive to a change in an electrical signal generated by one of said optoelectric elements, which corresponds to a change in a photo signal generated by the other of said optoelectric elements and transmitted in said optical fiber, for performing a warning function, said flexible tying member further comprising:

  • a flexible hollow tubular member having a hollow interior extending axially thereof;

    a first layer including said optical fiber and at least one electric wire, said optical fiber and electric wire of said first layer being arranged substantially parallel with each other and longitudinally extending through the hollow interior of said flexible hollow tubular member, said electric wire being electrically connected to at least one of said optoelectric elements; and

    a second layer including a reinforcing member, said reinforcing member of said second layer longitudinally extending through the hollow interior of said flexible hollow tubular member in parallel with said optical fiber and electric wire of said first layer, said reinforcing member of said second layer comprising a plurality of strands, each formed of a plurality of twisted steel wires.

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