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Anti-theft device for motorized vehicles

  • US 5,061,915 A
  • Filed: 06/12/1990
  • Issued: 10/29/1991
  • Est. Priority Date: 05/22/1990
  • Status: Expired due to Fees
First Claim
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1. An anti-theft device for a motorized vehicle with an electrical system having a common ground and a starter;

  • comprising;

    a first relay that energizes in response to an electrical signal from the electrical system;

    a first switch having a first and a second pole that switches power from the electrical system between the first and the second pole of said first switch;

    a second relay that energizes only when said first switch switches power from the first pole of said first switch to the second pole of said first switch after said first relay is energized;

    a second switch having a first and a second pole that switches power from the electrical system to the first pole of said second switch until said second relay is energized, whereupon said second switch switches power to the second pole of said second switch;

    a third relay that energizes when power from the electrical system is switched by said second switch to the second pole of said second switch while said third relay is connected to the common ground;

    a third switch connecting said third relay to the common ground that disconnects said third relay from the common ground when said second relay is energized; and

    a fourth switch having a first pole electrically connected to the starter and a second pole, said fourth switch switching power from the second pole of said second switch to the starter unless said third relay is energized.

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