Three hand movement for a timepiece with improved timesetting ge

Horology: time measuring systems or devices – Regulating means – For setting

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Details

368190, G04B 1712, G04B 2702

Patent

active

049320114

ABSTRACT:
A three hand movement of the type having a frame, a stepping motor mounted in the frame, a manually actutable timesetting stem disposed in the frame and a gear train driven by the stepping motor to rotate coaxial members carrying "seconds", "minutes", and "hours" hands. An improved dual reduction gear assembly comprises a first rotatable member with a toothed wheel and a second rotatable member having first and second pinions driving the "hours" and "minutes" wheels. A timesetting gear is adapted to be clutched to the "minute wheel". A friction coupling connects the first and second rotatable members during timekeeping. During timesetting, the friction coupling slips to disengage the toothed wheel from the first and second pinions, so that the second rotatable member separately functions as a reduction gear during timesetting.

REFERENCES:
patent: 3487633 (1970-01-01), Wuthrich
patent: 3548587 (1970-12-01), Wood
patent: 3731481 (1973-05-01), Nakayama
patent: 3837161 (1974-09-01), Wuthrich
patent: 4426158 (1984-01-01), Muller et al.
patent: 4623261 (1986-11-01), Muto
patent: 4794576 (1988-12-01), Schwartz et al.
patent: 4845693 (1989-07-01), Kubota
patent: 4888949 (1989-12-01), Schwartz et al.

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