Security glazing and alarm system

Details Security glazing and alarm system Security glazing and alarm system

1974-08-07

1976-03-30

Caldwell, John W.

Communications: electrical

Systems

Call station

340256, 340285, 200 6184, 200 6193, G08B 1300

Patent

active

039478378

ABSTRACT:
A glazing unit having a plurality of plies is provided with a grid of fine wires electrically connected in parallel. A warning signal is activated upon a change in the resistance of the grid. The arrangement permits resetting the alarm after a partial break in the grid. A second grid may be used as the reference resistance in the alarm circuitry. Thermally induced breakage of the fine wires is avoided by providing resilient connections to the bus bars.

REFERENCES:
patent: 2423649 (1947-07-01), Horvitch
patent: 3388032 (1968-06-01), Saunders
patent: 3594770 (1971-07-01), Ham
patent: 3623061 (1971-11-01), Mayhew et al.
patent: 3696373 (1972-10-01), Dunn et al.
patent: 3721594 (1973-03-01), Tarnopol et al.

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