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SLEEP-SENSING DEVICE FOR USE ON AUTOMOTIVE VEHICLES

  • US 3,631,446 A
  • Filed: 08/12/1968
  • Issued: 12/28/1971
  • Est. Priority Date: 08/12/1968
  • Status: Expired due to Term
First Claim
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1. Apparatus for sensing sleep or drowsiness of a driver of a motor vehicle or the like, comprising A. An electrical switch coupled to the steering apparatus of a motor vehicle, said switch being a single-pole double-throwtype switch, the coupling to said steering apparatus being such that a small movement of the steering apparatus moves the single pole of said switch to one throw or the other:

  • B. a charge transfer condenser;

    C. a countercircuit including an amplifier, said circuit including an input and output;

    D. variable potential generator means for energizing said circuit, said generator means being mechanically coupled to the drive train of said vehicle and electrically coupled only to said circuit;

    E. means for electrically energizing said charge transfer condenser when said pole is at one throw of said switch;

    F. means for transferring electrical energy from said transfer condenser to the input of said countercircuit when said pole is at the other throw of said switch, and a relay having at least a coil, a movable contact and a fixed contact;

    G. switching means coupled to and actuated by the output of said countercircuit, said switching means having contacts across which a series connected alarm device and alarm energization source are connected whereby when the output of said countercircuit reaches a predetermined value said switch is actuated to cause conduction across said contacts and actuate said alarm device.

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