Communications: electrical – Systems – Call station
Patent
1975-06-02
1976-11-23
Swann, III, Glen R.
Communications: electrical
Systems
Call station
200 6162, 335205, G08B 1308
Patent
active
039939880
ABSTRACT:
An intrusion detecting apparatus for an alarm system to signal breakage and movement of a door, window, or other movable partition comprises an elongated member forming an interior channel in which is disposed a switch actuating element for motion into and out of cooperative relation with a switch element supported on the channel. The switch actuating element is connected to the partition by a tensile member and is coupled to the elongated member by a spring so that movement of the partition from a predetermined position causes the switch actuating element to move out of cooperative relationship with the switch element and movement of the partition back to the predetermined position restores the element to a cooperative relationship. The tensile member may include a pair of electrical conductors which are connected to a device for detecting breakage of the partition.
REFERENCES:
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patent: 3175207 (1965-03-01), Hewitt, Jr.
patent: 3243797 (1966-03-01), Smith
patent: 3330922 (1967-07-01), Rowe
patent: 3626340 (1971-12-01), Mason et al.
patent: 3696380 (1972-10-01), Murphy
patent: 3887909 (1975-06-01), Beiswenger et al.
patent: 3899784 (1975-08-01), McHenry
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