Alarm buzzer apparatus

Details Alarm buzzer apparatus Alarm buzzer apparatus

1978-07-13

1980-01-08

Pitts, Harold I.

Communications: electrical

Audible indication

Ultrasonic pest control

340388, 340392, G10K 100

Patent

active

041830172

ABSTRACT:
An alarm buzzer for fire alarms, burglar alarms, and the like, is provided using a conventional piezoelectric transducer driven by a battery operated oscillator and mounted in a casing. The casing has a resonance cavity formed therein with the transducer mounted adjacent thereto and having an open end. A grill is mounted to the casing and extends over the resonant cavity and spaced therefrom by a predetermined spacing and a reflector plate is mounted onto the grill covering the grill portion facing the resonant cavity, whereby the efficiency of an alarm buzzer is increased by the combination of a resonance cavity and folded horn.

REFERENCES:
patent: 3974499 (1976-08-01), Shigemori

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