Security device for motor vehicles and other d.c. electrical sys

Details Security device for motor vehicles and other d.c. electrical sys Security device for motor vehicles and other d.c. electrical sys

1980-09-22

1982-04-06

Waring, Alvin H.

Communications: electrical

Selective

Having indication or alarm

307 10AT, 180287, B60R 2510, G08B 1322

Patent

active

043238785

ABSTRACT:
A security device for motor vehicles and other d.c. electrical systems responsive to use of the system wherein an alarm or other security element is connected across the source, a relay has its switch connected to the alarm element and its coil connected to a switch maintained open in the stand-by condition responsive to maintained voltage of the d.c. source or battery, the switch closing responsive to lowered d.c. voltage to energize the relay coil and close the relay switch to actuate the alarm element, and delay means controlling the time required by the relay coil switch to assume its open stand-by condition.

REFERENCES:
patent: 3533064 (1967-05-01), Perelman
patent: 3614734 (1971-10-01), Davis
patent: 3706966 (1972-12-01), So et al.
patent: 3831141 (1974-08-01), Bowman
patent: 4038635 (1977-07-01), Schotz

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