Clock movement
AssigneeMontres Breguet S.A.
InventorMichel Caspar
Life of this patent
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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.
Claims6
A clock movement comprising a first perpetual calendar mechanism and a second equation-of-time mechanism, said movement further comprising a third mechanism including means, cooperating with said perpetual calendar mechanism and said equation-of-time mechanism, for perpetually displaying the difference between the civil time, displayed by the first mechanism, and the true time.
Dependencies are inferred from the claim text.