Alarm watch

Details Alarm watch Alarm watch

1976-12-02

1980-04-15

Jackmon, Edith S.

Horology: time measuring systems or devices

Cases

With alarm or striking attachment

368291, 368250, G04B 3708, G04C 2100

Patent

active

041976975

ABSTRACT:
An alarm watch has an electro-acoustic transducer with a sound releasing cavity containing a vibrating plate for releasing an audible alarm sound. The surface of the vibrating plate exposed to the open air is treated with a water-repellant material having the property to shed or repel water so that when water enters into the sound releasing cavity and wets the vibrating plate, the vibrating plate readily throws off the water thereby obtaining rapid recovery of the alarm sounding function.

REFERENCES:
patent: 3577876 (1971-05-01), Spadini
patent: 3760583 (1973-09-01), Tsuruishi
patent: 3777472 (1973-12-01), Iinuma
patent: 3879726 (1975-04-01), Sweany

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