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Anti-theft device or system for vehicles

  • US 4,403,675 A
  • Filed: 09/10/1982
  • Issued: 09/13/1983
  • Est. Priority Date: 07/18/1977
  • Status: Expired due to Fees
First Claim
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1. In a vehicle having an engine ignition system controlled by a key-actuated ignition switch, the improvement comprising selectively controllable means for bypassing said ignition switch to permit opening of the ignition switch and removal of the key without de-energizing the ignition system but de-energizing the ignition system upon attempted operation of the vehicle while the ignition switch is open, said selectively controllable means comprising a first switch means constructed and arranged to be activated by movement of a vehicle operational component to a position which precludes normal operation of the vehicle, second switch means actuatable by the vehicle operator, and means responsive to activation of said first switch and actuation of said second switch when said ignition switch is closed for bypassing said ignition switch so long as said first switch remains activated, and regardless of the state of said ignition switch and said second switch, whereby the ignition switch can be opened and the key removed without de-energizing the ignition system, and attempted operation of the vehicle by movement of said component to a position which does not preclude vehicle operation will de-energize the ignition system unless said ignition switch is closed.

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