Horology: time measuring systems or devices – Regulating means – For setting
Patent
1989-11-06
1990-06-05
Miska, Vit W.
Horology: time measuring systems or devices
Regulating means
For setting
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.
Crutcher William C.
Miska Vit W.
Timex Corporation
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