Self-contained anti-theft device for motor vehicles

Details Self-contained anti-theft device for motor vehicles Self-contained anti-theft device for motor vehicles

1993-07-26

1995-09-12

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

180287, 340426, B60R 2504, B60R 2510

Patent

active

054499577

ABSTRACT:
An anti-theft device mountable on, in or otherwise adjacent the battery of a motor vehicle includes an enclosed power switch for opening the starting circuit between the battery and starter motor when the anti-theft device is activated, whereby it is impossible to start the vehicle. A normally closed bimetal switch device is connected in parallel with the power switch in one embodiment and is connected to the vehicle battery through the ignition switch whereby, when the power switch is open, an effort to start the vehicle through the ignition switch or by shortening the latter results in a noise which simulates a weak battery. A resistance is also connected across the power switch in parallel therewith to preclude the dropout of pre-set electrical accessories in the vehicle when the power switch is open. The anti-theft device is preferably operable by a remotely controlled encoder having a code signal identified by circuitry controlling operation of the power switch.

REFERENCES:
patent: 3646515 (1972-02-01), Vodehnal
patent: 4110734 (1978-08-01), Lepore et al.
patent: 4452197 (1984-06-01), Weber
patent: 4553127 (1985-11-01), Issa
patent: 4842093 (1989-06-01), Lerche et al.
patent: 4958084 (1990-09-01), Carlo et al.
patent: 5132551 (1992-07-01), Carlo et al.
patent: 5184023 (1993-02-01), Carlo et al.
patent: 5287006 (1994-02-01), Carlo et al.
European Search Report, dated Nov. 24, 1994.

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