Reverse alarm

Details Reverse alarm Reverse alarm

1981-05-05

1983-08-16

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Diaphragm

340384E, 340387, G08B 300, G10K 912

Patent

active

043994270

ABSTRACT:
An electronic alarm particularly designed to indicate reverse movement of vehicles. The alarm utilizes a synthetic plastic housing having a cavity defined therein which intersects the housing at an exterior surface. A sound producing diaphragm, the motor for vibrating the diaphragm, and the electronic control circuit, are all mounted upon a diaphragm mounting assembly which is received within the housing cavity forming a cavity cover. The diaphragm is located in opposed relationship to a cavity sound reflective base, and an air passage surrounding the diaphragm mounting assembly transmits sound vibrations through the cavity, and through ports defined in the diaphragm assembly at the cavity opening.

REFERENCES:
patent: 2545961 (1951-03-01), Levy
patent: 2957054 (1960-10-01), Levy et al.
patent: 3028927 (1962-04-01), Levy et al.
patent: 3076960 (1963-02-01), Knutson
patent: 3432002 (1969-03-01), Cohen
patent: 3454729 (1969-07-01), Seebinger
patent: 3728676 (1973-04-01), Brown
patent: 4310833 (1982-01-01), Sakaguchi

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