Signalling apparatus

Details Signalling apparatus Signalling apparatus

1982-04-30

1985-08-27

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340545, 340566, 340590, 310330, G08B 108

Patent

active

045381399

ABSTRACT:
Signalling apparatus in which a sensed change in condition, e.g. a window opened by an intruder or a valuable art object moved, causes the free end of a cantilevered spring to be snapped or twanged. A piezoelectric film bonded to the spring generates a pulsating voltage which energizes a transmitter, independently of any external power source. Remotely, a receiver which is selectively responsive to the transmitted pulsating signal generates an output signal indicating the change in condition, e.g. for initiating an alarm.

REFERENCES:
patent: 3553588 (1971-01-01), Honig
patent: 3582692 (1971-06-01), Palini
patent: 3614760 (1971-10-01), Zimmet
patent: 3750127 (1973-07-01), Ayers et al.
patent: 3781836 (1973-12-01), Kruper et al.
patent: 4193010 (1980-03-01), Kompanek
patent: 4197479 (1980-04-01), Gudzin
patent: 4333029 (1982-06-01), Kolm et al.

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