Planetary gear for date mechanism in a wristwatch

Details Planetary gear for date mechanism in a wristwatch Planetary gear for date mechanism in a wristwatch

1982-09-29

1984-04-17

Roskoski, Bernard

Horology: time measuring systems or devices

With calendar indicator

Movable ring or disk

368 34, G04B 1924

Patent

active

044431120

ABSTRACT:
A wristwatch with a stepping motor driving the hands through a normal gear train also includes a supplementary gear train driving a circumferential date ring showing the calendar date. The gear train includes a planetary gear assembly, which may also be selectively operated by an exterior manually rotatable button to change the date without interfering with the normal driving of the date ring from the stepping motor. Preferably the manually rotatable button is operable from the back of the watch using a ball-point pen or the like.

REFERENCES:
patent: 3645090 (1972-02-01), Mochizuki et al.
patent: 3722207 (1973-03-01), Challandes
patent: 3930131 (1975-12-01), Nishina
patent: 4259735 (1981-03-01), Vuille

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