Intrusion sensing device

Details Intrusion sensing device Intrusion sensing device

1985-01-28

1986-05-06

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

200 6108, 200 6193, 340545, G08B 1308, G08B 1306

Patent

active

045875170

ABSTRACT:
An apparatus for detecting the forced opening of a door. The apparatus comprises a paper sheet with a frangible conductive path thereon. The sheet has holes therein for the passage of a retractable bolt and fasteners, which are used to secure a strike plate to a frame. The sheet is then concealed behind the strike plate and the conductive loop surrounds the fastener holes. When the door is forced open without retraction of the bolt, a crack appears on the surface of the frame surrounding the fasteners. This crack causes a break in the conductive loop. This break is then detected by a detecting device electrically connected to a part of the loop, thereby triggering an alarm.

REFERENCES:
patent: 2859430 (1950-11-01), O'Callaghan
patent: 2927311 (1960-03-01), Donaldson
patent: 3714644 (1973-01-01), Hellstrom
patent: 4000488 (1976-12-01), Ephraim
patent: 4233595 (1980-11-01), Landkammer
patent: 4390867 (1983-06-01), Queren

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