Abstract: A toothed mobile part (1) for play take-up in a gear, particularly in horology, having certain (7) of its teeth fixed and entirely rigid, and other (8) of its teeth each intercalated between two rigid teeth (7) and elastically deformable, is characterised in that said elastically deformable teeth (8) consist of spring blades each comprising a gear flank (9), and in that for each spring blade (8) the distance (12) measured on the pitch circle (13) of the mobile part (1), between the gear flank (9) of the spring blade (8) and the corresponding flank (10) of the one among the two adjacent rigid teeth (7) facing the gear flank (9) is smaller than the distance (14), again measured on the pitch circle (13) of mobile part (1), between the gear flank (9) and the corresponding flank (10) of the other adjacent rigid tooth (7).

Abstract: Clutch device for timepiece, comprising first and second coaxial rotary mobile parts (1, 2) able to take up a relative axial coupled position in which a rotation of the first mobile part (1) gives rise to a rotation of the second mobile part (2), and a relative axial uncoupled position in which a rotation of the first mobile part (1) does not give rise to a rotation of the second mobile part (2), characterised in that is also comprises a friction element of viscoelastic material (30) intercalated between the mobile parts (1, 2) in order to transmit the rotation of the first mobile part (1) in the coupled position to the second mobile part (2).

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 setting device for a timepiece comprising a second-indicating element (1) and at least one other time-indicating element comprises a first manual control element (2) that can occupy a neutral position and a position for setting the other time-indicating element or elements, and a mechanism (3) for resetting the second-indicating element (1) to zero, connected to the first manual control element (2). The reset mechanism (3) comprises a second manual control element (6) and is configured so that actuating the second manual control element (6) resets the second-indicating element (1) to zero when the first manual control element (2) is in the position for setting the other time-indicating element or elements and has no effect on the second-indicating element (1) when the first manual control element (2) is in the neutral position.

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: 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.