Clock movement

Details Clock movement Clock movement

1992-03-31

1993-02-02

Miska, Vit W.

Horology: time measuring systems or devices

With calendar indicator

G04B 1924

Patent

active

051843331

ABSTRACT:
The clock movement comprises a perpetual calendar mechanism (1-15), an equation-of-time mechanism (16-19) and a third mechanism (20-23) which is actuated by the first so as to modify the angular position of an equation-of-time cam (16) of the second mechanism, as a function of the number of days in the months. Thus this cam (16) always performs exactly one complete revolution in one year, irrespective of the number of days in the year. The movement is therefore a perpetual calendar movement and a perpetual equation-of-time movement. It also has the advantage that, after it has been stopped for an indeterminate time, the exact angular position of the equation-of-time cam (16) is automatically restored, with no possibility of error, simply by bringing the date, year, month and time back into phase.

REFERENCES:
patent: 3940859 (1976-03-01), Troseth
patent: 4645354 (1987-02-01), Mercer
patent: 5023849 (1991-06-01), Vaucher

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