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

G - Physics

04

B

58/10

G04B 19/24 (2006.01) G04B 19/25 (2006.01)

Patent

CA 1190754

PLANETARY GEAR FOR DATE MECHANISM IN A WRISTWATCH 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.

436701

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