Perpetual calendar mechanism
AssigneeChopard Manufacture SA
InventorKarl-Friedrich Scheufele
Life of this patent
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Abstract
The perpetual calendar mechanism includes a date mobile (16, 28-31), a date lever (3) bearing a small click (14), a correction lever (4) driving a great click (40) and a finger (2) driving the levers (3, 4). The date mobile (16, 28-31) is shifted instantaneously by the small click (14) during the transition from one day to the next within a month and during the transition from the last day of a month of 31 days to the first day of the following month, and partly in a dragging manner by the great click (40) during the transition from the last day of a month of less than 31 days to the first day of the following month.
Claims12
A perpetual or annual calendar mechanism comprising:
- a date mobile (16, 28-31);
- and
- means (2, 3, 4, 14, 40) for driving the date mobile,
- wherein the driving means are arranged so that, during the transition from one day to the next within a month, the date mobile is shifted in an instantaneous manner, and during the transition from the last day of a month of less than 31 days to the first day of the following month, the date mobile is shifted in a dragging manner until it reaches an angular position corresponding to the 31st and then in an instantaneous manner to pass from the 31st to the 1st, said instantaneous shifts of the date mobile being effected by a first driving member of said driving means dropping under the action of a first return spring, said dragging shift of the date mobile being effected by a second driving member of said driving means progressively moving against the action of a second return spring.
Dependencies are inferred from the claim text.