Magnetically retained connecting cable incorporating magneticall

Details Magnetically retained connecting cable incorporating magneticall Magnetically retained connecting cable incorporating magneticall

1983-05-13

1985-08-20

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

335207, G08B 1314

Patent

active

045367540

ABSTRACT:
A connecting and sensing device and a method for its use in a system for electrically monitoring physical security, including a magnetically operated switch, such as an encapsulated magnetic reed switch, and a quantity of ferromagnetic material located in a fixed position relative to the magnetically operated switch. The switch is connected electrically to an alarm system control circuit and is physically restrained by a flexible cable or the like. An actuating magnet may be attached either to an object whose unauthorized removal is to be detected, or to a fixed object. The actuating magnet is held within a holder including a cavity which permits the magnetically actuated switch and ferromagnetic material to be placed in a predetermined location wherein a magnetic field of a desired polarity and strength produces a desired condition in the magnetically operated switch. The switch is retained in the desired location relative to the actuating magnet by the magnetic attraction between the actuating magnet and the ferromagnetic material. Unauthorized removal of the object being monitored by the use of the sensor results in the ferromagnetic material and the magnetically operated switch being pulled away from the actuating magnet, causing the switch to produce an electrically detectable change of state.

REFERENCES:
patent: 3414853 (1968-12-01), Motis
patent: 3426166 (1969-02-01), Canceill
patent: 3898641 (1975-08-01), Banner
patent: 4011555 (1977-03-01), Pearce
patent: 4213110 (1980-07-01), Holce
patent: 4234879 (1980-11-01), Baker

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