Horology: time measuring systems or devices – With calendar indicator – Movable ring or disk
Patent
1979-06-19
1981-04-07
Smith, Jr., David
Horology: time measuring systems or devices
With calendar indicator
Movable ring or disk
368 37, G04B 1924, G04B 1920
Patent
active
042610478
ABSTRACT:
The date driving mechanism of a watch comprises a date driving wheel having a partially teethed portion engaged with teeth of a calendar driving wheel which in turn drives a calendar display dial so as to advance the calendar display dial a given amount each rotation of the date driving wheel. A cam integral with the date driving wheel engages a pivotal control member so as to hold the control member against the calendar driving wheel normally to restrain movement of the date dial. The cam has a flat side so as to release the calendar driving wheel from restraint when being driven by the teethed portion of the date driving wheel, thereby relieving load on the date driving wheel. The control member has a resilient arm which yields to permit manual correction of the calendar display.
REFERENCES:
patent: 3667211 (1972-06-01), Schneider
patent: 4081950 (1978-04-01), Chappatte
Adams Bruce L.
Burns Robert E.
Conklin John B.
Kabushiki Kaisha Daini Seikosha
Lobato Emmanuel J.
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