Electromechanical trigger for alarm clocks and other timer-opera

Details Electromechanical trigger for alarm clocks and other timer-opera Electromechanical trigger for alarm clocks and other timer-opera

1981-04-27

1984-04-17

Weldon, Ulysses

Horology: time measuring systems or devices

Chronological

With simultaneous time indicating means

368250, 368254, 368262, 368269, G04B 2302

Patent

active

044431139

ABSTRACT:
An alarm clock has a cambered leaf spring traversed by a nest of clock-hand shafts projecting from a mounting plate designed as a printed-circuit board. The leaf spring is supported at opposite ends by posts rising from the mounting plate and is limitedly swingable about a centerline parallel to that plate and perpendicular to the axis of the nested shafts. A toothed control disk centered on the same axis, with a hub carrying an alarm hand, is axially shiftable under pressure of the cambered leaf spring upon alignment of a tooth on that disk with a notch in an adjoining hour wheel; two diametrically opposite metallic contacts formed by lateral tongues on that spring then engage respective countercontacts on the mounting plate to close a circuit for the emission of an acoustic alarm signal. The alarm circuit can be broken by a manually displaceable interrupter lifting one of these tongues off its countercontact; with a modified alarm circuit, closure of one or the other contact pair can be selectively inhibited to enable the alternative operation of a buzzer or of a radio receiver upon displacement of the control disk by the leaf spring.

REFERENCES:
patent: 3541776 (1970-11-01), Ganter
patent: 3603075 (1971-09-01), Wolber et al.
patent: 3738098 (1973-06-01), Scheer
patent: 4069658 (1978-01-01), Ito

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