Ultrasonic transmitter for burglar alarm system

Details Ultrasonic transmitter for burglar alarm system Ultrasonic transmitter for burglar alarm system

1976-06-01

1978-09-26

Waring, Alvin H.

Communications: electrical

Condition responsive indicating system

With particular coupling link

340558, 340310R, G08B 1308

Patent

active

041174623

ABSTRACT:
An ultrasonic transmitter for apprising a central burglar alarm system of an unauthorized event includes a transmitting diaphragm which is repeatedly struck by a metal ball driven by a lever. The lever is actuated by a toothed wheel which is rotated by a motor spring, the rotation being governed to maintain constant speed and constant ultrasonic pulse rate. The rotation of the wheel is stopped by a striker interfering therewith, the striker being spring biased to the non-interference position. Thus the striker must be retained in the interference position by a door, window, trip wire, or the like, and any disruption of these structures will trip the striker and cause the transmitter to generate an ultrasonic pulse train and sound an alarm.

REFERENCES:
patent: 2905762 (1959-09-01), Rettie et al.
patent: 3112486 (1963-11-01), Adler

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