Audio signalling device

Details Audio signalling device Audio signalling device

1985-08-08

1986-08-05

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, 310322, 310324, G08B 300, H01L 4104

Patent

active

046046062

ABSTRACT:
An audio signalling device provides a housing having at least one end, a piezoelectric transducer, a nodal mounting for the piezoelectric transducer in proximity to the end of the housing, a planar member, a mounting for the planar member in a spaced adjacent relationship with the piezoelectric transducer, and spring contacts mounted on the planar member for making spring biased electrical contact with the piezoelectric transducer.

REFERENCES:
patent: 4139842 (1979-02-01), Fujita et al.
patent: 4233679 (1980-11-01), Schwarzschild
patent: 4282520 (1981-08-01), Shipp et al.
patent: 4295009 (1981-10-01), Weidler
patent: 4420706 (1983-12-01), Siebold et al.

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