Self-testing security sensor for monitoring closure of vault doo

Details Self-testing security sensor for monitoring closure of vault doo Self-testing security sensor for monitoring closure of vault doo

1995-08-29

1997-05-27

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

340515, 340514, 340547, 340550, 340551, 335206, G08B 1308

Patent

active

056336268

ABSTRACT:
A self-testing device is provided for a monitoring system for monitoring whether a closure member such as a door or window is closed. The monitoring system includes a switch unit mounted on the frame of the closure member being monitored and including magnetically biased switches connected in one or more electrical monitoring circuits, and a door magnet unit mounted on the closure member being monitored. The door magnet includes one or more permanent magnets that produce a magnetic field which, when the closure member is closed, cause said switches to assume a first state. When the closure member is opened, the switches switch to a second, alarm state. The self-testing device is electrically controllable from a remote location and produces a canceling or diverting magnetic field which simulates the effect of movement of the closure member from the closed position thereof without any actual movement of the member.

REFERENCES:
patent: 3349323 (1967-10-01), Mullen
patent: 3408493 (1968-10-01), Westover et al.
patent: 3641552 (1972-02-01), Friberg
patent: 3878539 (1975-04-01), Gooding
patent: 4064452 (1977-12-01), Toth
patent: 4210889 (1980-07-01), Holce
patent: 4365196 (1982-12-01), Finch
patent: 4661805 (1987-04-01), Salzer
patent: 4866377 (1989-09-01), Macovschi
patent: 4908604 (1990-03-01), Jacob

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