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.

Abstract: A tourbillon mechanism comprises a cage (1), an escapement wheel (3), an anchor (5) and a balance wheel. The cage (1) comprises an upper portion (1a) and a lower portion (1b) with cylindrical skirts and adapted to be superposed on each other. Moreover, the cage (1) is associated with a monolithic bridge (7) ensuring the positioning of the escapement wheel (3) and of the anchor (5). The cage is of aluminum alloy treated by anodic oxidation.

Abstract: The balance wheel, particularly for a timepiece movement, provided with an adjustment device of its inertia to adjust its frequency of oscillation, comprises a rim (1) of circular shape, free from projecting portions, connected by radial arms (2) to a hub (3). At the intersection of each arm (2) with the rim (1) the latter comprises a recess (4) opening on one of its surfaces, the bottom of this recess (4) comprising a passage (6) opening on the other surface of the rim (1). Balance weights (7) having a general U shape are introduced into these recesses (4) by resilient deformation, these balance weights (7) being held in the desired angular position within corresponding recesses (4) by friction due to the resilience of these balance weights (7) themselves.

Abstract: The present invention relates to a tourbillon mechanism comprising a cage (1), an escapement wheel (3), an anchor (5) and a balance wheel. The cage (1) comprises an upper portion (1a) and a lower portion (1b) with cylindrical skirts and adapted to be superposed on each other. Moreover, the cage (1) is associated with a monolithic bridge (7) ensuring the positioning of the escapement wheel (3) and of the anchor (5). The cage is of aluminum alloy treated by anodic oxidation.

Abstract: The balance wheel, particularly for a timepiece movement, provided with an adjustment device of its inertia to adjust its frequency of oscillation, comprises a rim (1) of circular shape, free from projecting portions, connected by radial arms (2) to a hub (3). At the intersection of each arm (2) with the rim (1) the latter comprises a recess (4) opening on one of its surfaces, the bottom of this recess (4) comprising a passage (6) opening on the other surface of the rim (1). Balance weights (7) having a general U shape are introduced into these recesses (4) by resilient deformation, these balance weights (7) being held in the desired angular position within corresponding recesses (4) by friction due to the resilience of these balance weights (7) themselves.