Abstract: A balance-spring stud holder includes a clamping part defining three contact zones intended to press against a lateral wall of a projecting part of the balance bridge, a first contact zone being connected to a second contact zone by a first part and to the third contact zone by a second part of the clamping part. The first part has a first stiffness at a second median point of the second contact zone, relative to a first median point of the first contact zone, which is greater than three times a second stiffness that the second part has at a third median point of the third contact zone relative to the first median point of the first contact zone. The first stiffness can be seven times greater than the second stiffness.

Abstract: A regulating member for a horological movement including an inertial mass, for example an annular balance, a balance spring, and an index-assembly system for adjusting the rate of the balance spring, the balance spring including a coiled strip and a device for adjusting the stiffness of the balance spring, which are provided with a resilient element arranged in series with the coiled strip, the index-assembly system including a stud-holder including a first stud and a second stud, wherein the resilient element is arranged between the first stud and the second stud, the first stud being capable of moving relative to the second stud, the movement of the first stud changing the stiffness of the balance spring.

Abstract: A regulating member for a horological movement includes an inertial mass, for example a balance, a balance spring, and an index-assembly system for adjusting the rate of the balance spring, the balance spring including a coiled strip and a device for adjusting the rigidity of the balance spring fitted with a resilient element arranged in series with the coiled strip, the index-assembly system being configured to adjust the rate of the regulating member with a resolution lower than or equal to 1 second per day.

Abstract: A display hand intended to equip a timepiece, including a body and a pipe, providing an arbor hole arranged for fitting the display hand onto a drive arbor. The body is made of a composite material, the pipe includes, over all or part of the outer periphery, a surface for connection to the hand body to ensure the adhesion of the composite material to the pipe.

Abstract: A timepiece wheel set, including an arbor including a housing for reception of a plate and including, on either side of the housing, an axial abutment surface maintained in abutment on the plate, which includes a radially resilient arm and a second arm forming together a clamp clamping a radial bearing surface of the arbor in proximity to the axial abutment surface. The arbor further includes an entry ramp arranged to push back radially the first resilient arm and the second resilient arm, to allow the plate to be placed on the arbor.

Abstract: A display hand intended to equip a timepiece, including a body and a pipe, providing an arbor hole arranged for fitting the display hand onto a drive arbor. The body is made of a composite material, the pipe includes, over all or part of the outer periphery, a surface for connection to the hand body to ensure the adhesion of the composite material to the pipe.

Abstract: A display hand intended to equip a timepiece, including a body and a pipe, providing an arbor hole arranged for fitting the display hand onto a drive arbor. The body is made of a composite material, the pipe includes, over all or part of the outer periphery, a surface for connection to the hand body to ensure the adhesion of the composite material to the pipe.

Abstract: A display hand intended to equip a timepiece, including a body and a pipe, providing an arbor hole arranged for fitting the display hand onto a drive arbor. The body is made of a composite material, the pipe includes, over all or part of the outer periphery, a surface for connection to the hand body to ensure the adhesion of the composite material to the pipe.

Abstract: A timepiece movement including a first lever bearing a first drive wheel, a second lever bearing a second wheel for time setting, and a third lever bearing a date correction mechanism. The third lever is mounted to pivot on the second lever and arranged to move between a meshing position, in which the date correction mechanism cooperates with the date display mechanism, and a retraction position, in which the date correction mechanism is disconnected from the date display mechanism.

Abstract: A timepiece wheel set, including an arbor including a housing for reception of a plate and including, on either side of the housing, an axial abutment surface maintained in abutment on the plate, which includes a radially resilient arm and a second arm forming together a clamp clamping a radial bearing surface of the arbor in proximity to the axial abutment surface. The arbor further includes an entry ramp arranged to push back radially the first resilient arm and the second resilient arm, to allow the plate to be placed on the arbor.

Abstract: A timepiece movement including a first lever bearing a first drive wheel, a second lever bearing a second wheel for time setting, and a third lever bearing a date correction mechanism. The third lever is mounted to pivot on the second lever and arranged to move between a meshing position, in which the date correction mechanism cooperates with the date display mechanism, and a retraction position, in which the date correction mechanism is disconnected from the date display mechanism.

Abstract: A balance staff including a main shoulder of a balance, a first radial lateral bearing surface for this balance, a roller sleeve shoulder, and a balance spring collet shoulder. The roller shoulder is adjacent to a first radial shoulder, the collet shoulder is adjacent to a second lateral surface, which defines, with the first radial shoulder, a collar including the balance shoulder which is adjacent to a first lateral bearing surface for the bearing of a balance, the first lateral bearing surface facing the same side as the first radial shoulder, the balance shoulder is separated from this collet shoulder by a seat forming the largest diameter of the collar.

Abstract: A timepiece movement for a watch, including a main plate and a bar holding a wheel set in a reference position, and a device to adjust the height of this bar in relation to the plate in the direction of the axis of rotation of the wheel set, at a first point remote from the reference position, and this height adjustment device includes a screw or a worm rotatably movable about an oblique control axis in relation to the axis of rotation, and a cone or a curved surface for transforming motion between this screw or worm and a pusher movable in a parallel direction to the axis of rotation.

Abstract: A balance staff including a main shoulder of a balance, a first radial lateral bearing surface for this balance, a roller sleeve shoulder, and a balance spring collet shoulder. The roller shoulder is adjacent to a first radial shoulder, the collet shoulder is adjacent to a second lateral surface, which defines, with the first radial shoulder, a collar including the balance shoulder which is adjacent to a first lateral bearing surface for the bearing of a balance, the first lateral bearing surface facing the same side as the first radial shoulder, the balance shoulder is separated from this collet shoulder by a seat forming the largest diameter of the collar.

Abstract: The column wheel (40) for a 3 stroke mechanism has a hub (46) arranged at the centre of a superstructure exhibiting rotational symmetry of order n, the superstructure including n radial arms (48) and n columns (44) parallel to the axis of rotation of the column wheel, the columns being regularly distributed along the circumference of the column wheel and separated from each other by n empty spaces forming as many openings between the columns. The column wheel is characterized in that the width of the columns (44) is larger than the openings between the columns, and in that the width of the arms (48) is less than half the width of the columns (44).

Abstract: Timepiece movement including a main plate and a bar holding a wheel set in a reference position, and a means of adjusting the height of this bar in relation to the plate in the direction of the axis of rotation of the wheel set, at a first point remote from the reference position. This height adjustment means includes a screw or a worm rotatably movable about an oblique control axis in relation to the axis of rotation, and a cone or a curved surface for transforming motion between this screw or worm and a pusher movable in a parallel direction (D9) to the axis of rotation. Watch including a movement of this type.

Abstract: The pusher device of the chronograph mechanism includes a pivoting control part (56) mounted on a first pivot (55) and carrying a click (52) and an intermediate lever (58) mounted on a second pivot (59). The intermediate lever is arranged to be actuated by the push button and includes a distal portion arranged to actuate the pivoting control part (56). The first pivot (55) and the second pivot (59) are arranged at the periphery of the movement on both sides of the push button (67, 69) and the pivoting control part and the intermediate lever extend from their respective pivot against each other. The click (52) is arranged to push in front of it one tooth of the toothing (42) of the column wheel (40) when the push button is actuated, then to return by sliding over the tip of a tooth.

Abstract: Timepiece assembly (1) comprising a middle part (4) cooperating in abutment with a bottom plate (2) and a screw (6) for securing (5) this bottom plate (2) to this middle part (4), cooperating with an axis (D0) housing (7) of this plate (2), to press a flange (10) onto a first shoulder (8) of this plate (2) in proximity and on a second shoulder (9) of this middle part (4), and this first shoulder (8) is conical or spherical and/or this second shoulder (9) which is conical or spherical, cooperates with this flange (10) on at least two surfaces or points, in an assembled position wherein this plate (2) and this middle part (4) are assembled to each other and in the position wherein this screw (6) is completely screwed into this housing (7).

Abstract: The column-wheel (1) for a chronograph includes: a ratchet (2) provided with a plurality of teeth (3) the shape of which defines the direction of rotation of the column-wheel; a superstructure coaxial to the wheel and having n>=3 order rotational symmetry, the peripheral part of the superstructure forming n columns (10) parallel to the wheel axis and arranged substantially along the periphery of the ratchet (2), each column including an outer part, the cross-section of which is substantially shaped like a truncated triangle with a base substantially parallel to the circumference of the wheel and a front side (12), called the leading edge, and a back side (13), called the trailing edge, extending from the base towards the interior of the wheel. The column-wheel is characterized in that said cross-section is asymmetrical, a first angle ? between the leading edge (12) and the base (14) being smaller than a second angle ? between the base and the trailing edge (13).

Abstract: A driving member for a timepiece movement comprises two superimposed coaxial barrels (1, 11) coupled in series, each barrel including a spring provided in a cylindrical housing rotatingly mounted on a common shaft (20). The respective housings (2, 12) of the barrels are positioned opposite each other and do not include a lid, and the springs (7, 17) are separated only by a separation washer (26) or a gap. This arrangement can be used for increasing the height (H) of the springs, and thereby the amount of energy and the power reserve of the watch for an identical global volume of the driving member, or for reducing the total height of the driving member. Such a driving member is particularly intended for watches with a high power reserve.