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METHOD AND APPARATUS FOR DETECTING THE UTILIZATION OF A VEHICLE SAFETY BELT

  • US 3,806,867 A
  • Filed: 06/04/1971
  • Issued: 04/23/1974
  • Est. Priority Date: 06/04/1971
  • Status: Expired due to Term
First Claim
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1. In a vehicle having an occupant seat and safety belt means including securing means for holding said safety belt means about the occupant for restraining the occupant, an apparatus comprising:

  • first conductor means carried by and extending along said safety belt means; and

    circuit means connected to said first conductor means including oscillating means for supplying oscillating electrical energy to said first conductor means;

    said first conductor means providing a reactive impedance for said oscillating means so that said first conductor means is operatively cooperating with said oscillating means, the value of said reactive impedance of said first conductor means being changed from a first value when said safety belt means is not about said occupant to a second value when said safety belt means is held about said occupant by said securing means so that said first conductor means at least partly surrounds said occupant said circuit means including means for providing an output signal at least in part in response to said change from said first value to said second value of the reactive impedance of said first conductor means for detecting the utilization of said safety belt means by said occupant with said securing meAns holding said safety belt means about said occupant.

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