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Motion preventing device for motor vehicles

  • US 4,142,601 A
  • Filed: 01/10/1977
  • Issued: 03/06/1979
  • Est. Priority Date: 06/23/1976
  • Status: Expired due to Term
First Claim
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1. A device for preventing the motion of a motor vehicle comprising:

  • an ignition switch including an ignition terminal, a starter terminal and a movable contact point connected to a power source;

    an ignition device connected to said ignition terminal;

    a starter motor connected to said starter terminal;

    a driver suitability discriminating means for discriminating the suitability of an operator to drive the motor vehicle and generating a first signal corresponding to the suitability;

    a neutral switch means for generating a second signal corresponding to what gear position a transmission of said motor vehicle is changed to;

    said neutral switch means comprising a neutral switch connected with said starter motor for being controlled to turn on only when said transmission is in a neutral gear position, a differential amplifier having two input terminals coupled to the two sides of the neutral switch and an output terminal, and a resistor connected between the power source side terminal of said neutral switch and said ignition terminal; and

    a motion preventing device coupled to said output terminal of said differential amplifier and actuated by both said driver suitability discriminating means and said neutral switch means, said device serving to disconnect said ignition device from said ignition terminal when said device is supplied said first signal showing an unsuitable condition and a second signal showing that said transmission is changed to a gear position other than a neutral gear position, and when otherwise, connecting said ignition device to said ignition terminal.

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