Alarm system

Details Alarm system Alarm system

1977-03-09

1978-08-15

Gill, James J.

Signals and indicators

Alarms

Burglar

116 93, G08B 1308

Patent

active

041064275

ABSTRACT:
An alarm system for detecting and signaling the unauthorized opening of a movable closure, includes a support plate, a toothed rack, slidably supported on the support plate, a gear, rotatably mounted on the support plate and, in mesh with the teeth of the rack, spring means and a level arm coupled to the gear, and a bell mounted on the support plate. The alarm system is self-powered and is mechanically actuated by opening of the closure. The system is reset automatically by closing the movable closure.

REFERENCES:
patent: 344871 (1886-07-01), Schmidt
patent: 635332 (1899-10-01), Malloy
patent: 709331 (1902-09-01), Kinzy
patent: 817437 (1906-04-01), McGowan
patent: 2486139 (1949-10-01), Feldman
patent: 3714922 (1973-02-01), Da Silva

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