Calendar mechanism having means driving and correcting two...

Details Calendar mechanism having means driving and correcting two... Calendar mechanism having means driving and correcting two...

2007-01-30

2007-01-30

Miska, Vit (Department: 2841)

Horology: time measuring systems or devices

Astronomical

With moon and earth display

C368S035000

Reexamination Certificate

active

10992236

ABSTRACT:
The calendar mechanism for a watch includes two rotating indicators provided with respective toothed wheels (11, 14), indicating for example the date and the phase of the moon or the day of the week, and drive lever (21) provided with two beaks (22, 23) for making the corresponding indicator move forward one step, depending upon whether it is pivoting in one direction or the other. The daily movement forward of the indicators is assured by a drive wheel (20) making one revolution per day and provided with a pin (38) which cooperates with a cam surface (33) of the drive lever. In order to correct the indicators independently of each other, a gear train (44) actuated by a control stem of the watch causes a correction wheel (50) to rotate, which acts on a nose of the drive lever (21) to pivot the latter selectively in one direction or the other. The correction wheel (50) mounted on a lever (46), controlled by a cam (39) of the drive wheel (20), is released from the correction wheel (44) as long as the drive wheel actuates the drive lever.

REFERENCES:
patent: 203640 (1878-05-01), Paddock
patent: 2720746 (1955-10-01), Punzmann
patent: 3350873 (1967-11-01), Egger et al.
patent: 2003/0189875 (2003-10-01), Wilmouth
patent: 341115 (1959-09-01), None
patent: 584 926 (1977-02-01), None
patent: 624 533 (1981-08-01), None
patent: 129 683 (1985-01-01), None
patent: 1 517 236 (1968-03-01), None
patent: 2095438 (1982-09-01), None

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