Horology: time measuring systems or devices – With calendar indicator – Movable ring or disk
Patent
1996-07-12
1997-12-16
Roskoski, Bernard
Horology: time measuring systems or devices
With calendar indicator
Movable ring or disk
368 35, 368 28, G04B 1920
Patent
active
056993218
ABSTRACT:
A timepiece such as a watch carries a date ring with a window display. The ring carries an engaging system capable of driving at the end of each month an annual ring having twelve or twenty four external teeth and five internal teeth. A calendar driving wheel set has a first finger capable of driving the date ring and a second finger capable of driving the annual ring. At the end of a month of thirty days, one of the five internal teeth of the annual ring appears on the path of the second finger and drives this ring in its travel, such ring, from being driven becomes a driving wheel and, via the engaging system, causes the date ring to advance to the first of the following month. A manual correction remains necessary at the end of the month of February.
Compagnie Des Montres Longines, Francillon S.A.
Roskoski Bernard
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