Communications: electrical – Systems – Call station
Patent
1976-04-02
1977-06-14
Swann, III, Glen R.
Communications: electrical
Systems
Call station
324 34PS, 340258C, G08B 1304, G08B 1308
Patent
active
040300897
ABSTRACT:
An alarm system for warning of breakage of glass in a door, window, or the like includes a breakage-responsive sensor on the movable part of the door or window connected to a coil on a core supported on that part. A coil on a core fixed to the stationary frame for the door or window is magnetically coupled to the other coil when the door or window is closed to permit electrical energization of the sensor circuit from the latter coil and detection of load variations on that coil as an indication of sensor operation. Also a third coil on a core, located on the movable part and connected to the sensor circuit, may be similarly coupled to a fourth coil on a core located on the stationary part so that the fourth coil reflects the variation due to sensor operation and operates the alarm.
REFERENCES:
patent: 3764971 (1973-10-01), Brobeck
patent: 3943485 (1976-03-01), Waldman
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