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Sleep warning device for mobile vehicles

  • US 5,990,795 A
  • Filed: 02/05/1999
  • Issued: 11/23/1999
  • Est. Priority Date: 02/06/1998
  • Status: Expired due to Fees
First Claim
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1. A sleep warning device responsive to nodding of the head of an operator of a mobile vehicle, said device comprising a seat belt including a shoulder belt to which a capacitance element including a capacitor circuit is adjustably secured, electronic circuitry operating on the vehicle'"'"'s battery source, said circuitry comprising an oscillator driving an amplifier with an interstage transformer output, the basic capacitor circuit including a center tapped secondary of an interstage transformer, said seat belt capacitance element being one arm of a bridge and a balancing capacitor being in the remaining arm whereby there is a change in electrical capacitance upon nodding of the operator'"'"'s head to activate a warning circuit.

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