Alarm buzzer and accessory

Details Alarm buzzer and accessory Alarm buzzer and accessory

1991-09-03

1992-10-20

Ng, Jin F.

Communications: electrical

Audible indication

Ultrasonic pest control

340321, 340546, G08B 300

Patent

active

051573741

ABSTRACT:
An alarm buzzer produce an alarm sound from a sound-producing device installed in a hollow container in which an opening through which the sound is sent out is arranged not in the face opposite the sound-producing face of the device but in one or both of the back and side faces other than said face opposite said sound-producing face so that sound amplification is achieved through Helmholtz resonance.

REFERENCES:
patent: 3345627 (1967-10-01), Herst et al.
patent: 3432843 (1969-03-01), Spring
patent: 3614763 (1971-10-01), Yannuzzi
patent: 4075626 (1978-02-01), Sakaguchi et al.
patent: 4183017 (1980-01-01), Sims
patent: 4404549 (1983-09-01), Berg
patent: 4633232 (1986-12-01), Nelson et al.

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