Non-compromisable intrusion sensor circuit

Details Non-compromisable intrusion sensor circuit Non-compromisable intrusion sensor circuit

1978-04-04

1980-06-24

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

Specific condition

340539, G08B 1308

Patent

active

042097770

ABSTRACT:
An intrusion sensor circuit for protecting building openings having at least one moveable closure member, the sensor circuit including a magnet and a pair of magnetically operated switches mounted on the building opening and/or the moveable closure member therefor, the magnetic switches being commonly moveable relative to said magnet. An alarm circuit connected to the magnetically operated switches transmits an alarm signal to a receiving or monitoring station upon movement of the closure member a selected distance relative to the building opening when the circuit is armed. The pair of magnetic switches are positioned a short selected distance from each other, the first of the switches being positioned opposite a permanent magnet member on either the moveable closure member or the building opening and the first magnetic switch is adjacent thereto when the opening is closed. In a preferred embodiment, the first of the magnetic switches is maintained closed by the permanent magnet and the second one is normally open. There are four possible combinations of the magnetic switches being opened or closed, three of which will set off the alarm. The fourth situation when one switch is closed and the second space switch is open is the only combination which will keep the alarm turned off. The circuit includes a pair of NOR gates connected as a one shot multivibrator.

REFERENCES:
patent: 2877361 (1959-03-01), Chase
patent: 3828340 (1974-08-01), Bauer, Jr. et al.
patent: 3986183 (1976-10-01), Fujiwara

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