G - Physics – 04 – B
Patent
G - Physics
04
B
58/32
G04B 23/00 (2006.01) G04C 21/16 (2006.01)
Patent
CA 1168053
ABSTRACT OF THE DISCLOSURE 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 sup- ported 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 car- rying 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 op- posite 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 displace- able interrupter lifting one of these tongues off its counter- contact; 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.
376213
Fehrenbacher Wolfgang
Heinzelmann Hans
Scheer Erich
Kieninger & Obergfell
Swabey Ogilvy Renault
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