Passive security device

Details Passive security device Passive security device

1979-10-18

1981-10-27

Swann, III, Glen R.

Communications: electrical

Selective

Having indication or alarm

180287, B60R 2510

Patent

active

042976740

ABSTRACT:
An antitheft device for a motor vehicle has a pushbutton disarming circuit coupled to a passive ignition cut-out circuit and to a passive arming circuit. The ignition cut-out circuit is interposed in the automobile ignition circuit and includes an SCR switchable from "on" to "off" by the disarming circuit to permit ignition. The passive arming circuit includes a Darlington amplifier configuration, is interposed in the automobile ignition circuit, and is coupled through an exit delay circuit to the remaining circuit portions of the device: interval timing and activating circuit, square-wave generator, trigger, entrace delay and siren circuits. The amplifier configuration supplies power to operate the circuits until switched by proper actuation of the disarming circuit and automobile ignition.

REFERENCES:
patent: 3585584 (1971-06-01), Behrend
patent: 3707702 (1972-12-01), Plattner
patent: 3829829 (1974-08-01), Teich
patent: 3930226 (1975-12-01), Plumberg
patent: 3956732 (1976-05-01), Teich
patent: 4016537 (1977-04-01), Ray
patent: 4107543 (1978-08-01), Kaplan
patent: 4174516 (1979-11-01), Cleary

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