Cranford alert system - burglar alarm

Details Cranford alert system - burglar alarm Cranford alert system - burglar alarm

1991-03-21

1992-07-21

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

70DIG49, 200 6167, 340426, E05B 4506, H01H 316, B60R 2510

Patent

active

051326671

ABSTRACT:
A locking arrangement with built-in alarm mechanism utilizing a contact between portions of a split bolt arrangement as the prime security measure is described. Correct sequencing of both the locking and unlocking actions is required to prevent alarm. Two realizations are described: a self-contained unit for building doors; and an automobile unit with central alarm, alarm sensors for ignition and other locations subject to tampering (hood, trunk, battery), and a set resistance method to prevent disarming by either circuit opening or shorting techniques.

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patent: 4901057 (1990-02-01), Suneborn

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