Abstract: A timepiece mechanism including a movable component oscillating about a rest plane passing through a pivot axis. An arbor of the movable component includes a main protruding portion which forms the largest radius of the movable component about this axis. The protruding portion is delimited by two surfaces defining a profile inscribed in a rectangle whose shape proportion is greater than 2 wherein the direction of the length defines a main axis, which occupies a determined angular position with respect to the rest plane in the rest position of the movable component. The mechanism has a preferred direction of magnetization that is substantially orthogonal to the main axis of the arbor in the rest position.

Abstract: A mainspring including a metallic strip wound on itself. The mainspring includes an excess thickness forming a bridle in one-piece with the strip.

Abstract: The invention relates to a system including a pinion (5) and a toothed wheel (7) coaxially mounted relative to a pivoting arbor (3). According to the invention, the gear system (1) includes a securing device (21) between the pinion and the wheel so as to prevent any relative movement of one with respect to the other. The invention also relates to methods of manufacturing the toothed wheel (7) and the final assembly of the gear system (1). The invention concerns the field of timepieces.

Abstract: A method of improving the pivoting of a wheel set for a scientific instrument, including an arbor pivoting or oscillating about a wheel set axis, is provided. A static balancing of this wheel set is performed to bring the center of gravity onto this axis. A desired value is determined for the resulting unbalance moment of this wheel set about this axis, corresponding to a predetermined desired divergence between a first principal longitudinal axis of inertia of this wheel set, and this axis. This wheel set is set in rotation at a predetermined speed about this wheel set axis, and the resulting unbalance moment is measured with regard to this axis. An adjustment is made to the value of the resulting unbalance moment of this wheel set about this axis within a given determined tolerance with regard to this desired value.

Abstract: A timepiece mechanism including a movable component oscillating about a rest plane passing through a pivot axis. An arbor of the movable component includes a main protruding portion which forms the largest radius of the movable component about this axis. The protruding portion is delimited by two surfaces defining a profile inscribed in a rectangle whose shape proportion is greater than 2 wherein the direction of the length defines a main axis, which occupies a determined angular position with respect to the rest plane in the rest position of the movable component. The mechanism has a preferred direction of magnetization that is substantially orthogonal to the main axis of the arbor in the rest position.

Abstract: The invention relates to a method of manufacturing a spring for a timepiece, including the following steps: (a) forming a body using first and second metallic materials secured to each other; (b) decreasing the section of the body; and winding the body to form the spring. The invention also relates to the spring obtained via the method. The invention concerns the field of regulating members for timepieces.

Abstract: A method of adjusting oscillation frequency of a timepiece regulating assembly with no index assembly, to a predetermined oscillation frequency, including: randomly taking a particular balance spring assembly from a production of toleranced products; measuring return torque of the balance spring assembly; randomly taking a balance from a production of toleranced products; calculating theoretical inertia of the particular balance required to achieve the predetermined oscillation frequency, according to the measured return torque of the balance spring; measuring real inertia of the particular balance; and by direct action on the particular balance, correcting the inertia of the particular balance to the calculated theoretical inertia value to obtain the predetermined oscillation frequency for the regulating assembly formed by the particular balance, and by the particular balance spring assembly.

Abstract: A metal pivot pin includes at least one pivot at at least one of its ends, and the metal is an austenitic steel, an austenitic cobalt alloy, or an austenitic nickel alloy in order to limit a sensitivity of the pin to magnetic fields. At least an outer surface of the at least one pivot is hardened to a predetermined depth relative to the rest of the pin in order to harden the at least one pivot.

Abstract: An oscillating mechanism for a timepiece movement, including a first rigid element and a second rigid element, each one fixed on a different element of the movement and at least one of which is mobile relative to the other and pivots about an axis. The mechanism is monobloc and flexible with a variable geometry, and includes a first elastic restoring mechanism producing an elastic connection between the first rigid element and an intermediate rigid element, and a second elastic restoring mechanism producing an elastic connection between the intermediate element and the second rigid element, which all are coplanar according to one plane and configured to be deformed according to the plane.

Abstract: A metal pivot pin for a timepiece movement includes at least one pivot at at least one of ends thereof, the metal is an austenitic steel, an austenitic cobalt alloy or an austenitic nickel alloy to limit sensitivity of the pin to magnetic fields, and at least an outer surface of the at least one pivot is hardened to a predetermined depth relative to a core of the pin. A method of fabricating a pivot pin includes forming the pivot pin from a base of austenitic steel, an austenitic cobalt alloy or an austenitic nickel alloy, to limit sensitivity of the pin to magnetic fields, including at least one pivot at one end of the pin, and diffusing atoms to a predetermined depth at least on an outer surface of said at least one pivot to harden the pivot in main areas of stress while maintaining a high roughness.

Abstract: A timepiece assembly including a balance spring stud fixed to a plate, and a balance spring wound into coils between an inner end fixed to a collet and an outer end fixed to the balance spring stud. The balance spring stud and/or the collet includes a braking mechanism cooperating with a first coil during accelerations by contraction or expansion of the balance spring higher than set values, to modify a resulting rigidity of the balance spring when the first coil is locally coupled to the braking mechanism, arranged on a first inner lip and a second outer lip included in the balance spring stud and/or in the collet, which includes a first inner lip and a second outer lip each including the braking mechanism.

Abstract: A mainspring including a metallic strip wound on itself. The mainspring includes an excess thickness forming a bridle in one-piece with the strip.

Abstract: A method of setting inertia of and/or poising a timepiece sprung balance assembly including: manufacturing a balance and a balance spring irreversibly assembled to each other; fixing an outer coil of the balance spring in position in a tamperproof manner to a balance spring stud which is immobilized in a tamperproof manner by irreversible attachment to a balance cock; determining a peripheral surface of the balance, every point of which is remote from the balance spring by a first predefined distance; performing a re-machining operation only on the peripheral area.

Abstract: An assembly of an axially extending member, made of a first material, in an aperture of a part, made of a second material having no plastic domain. The part includes pierced holes forming an elastic deformation mechanism distributed around the aperture thereof. Further, the member includes an elastically and plastically deformed, radially flared portion that radially grips a wall of the part surrounding the aperture by stressing the elastic deformation mechanism, so as to secure the assembly in a manner that is not destructive for the part. The assembly can be used in the field of timepieces.

Abstract: A method of improving pivoting of a wheel set for a scientific instrument, including an arbor pivoting or oscillating about a wheel set axis, the method including: static balancing of the wheel set to bring the center of gravity onto the axis; determining a desired value for the resulting unbalance moment of the wheel set about the axis, corresponding to a predetermined desired divergence between a first principal longitudinal axis of inertia of the wheel set, and the axis; setting the wheel set in rotation at a predetermined speed about the wheel set axis, the resulting unbalance moment is measured with regard to the axis; and adjusting a value of the resulting unbalance moment of the wheel set about the axis within a given determined tolerance with regard to the desired value.

Abstract: A timepiece assembly including a balance spring stud fixed to a plate, and a balance spring wound into coils between an inner end fixed to a collet and an outer end fixed to the balance spring stud. The balance spring stud and/or the collet includes a braking mechanism cooperating with a first coil during accelerations by contraction or expansion of the balance spring higher than set values, to modify a resulting rigidity of the balance spring when the first coil is locally coupled to the braking mechanism, arranged on a first inner lip and a second outer lip included in the balance spring stud and/or in the collet, which includes a first inner lip and a second outer lip each including the braking mechanism.

Abstract: An anti-trip mechanism includes a flange with a radial travel limiting channel and a balance spring with a strip wound into a plurality of coils. The balance spring includes an inner coil fixed, at a first end, to a collet coaxial to the balance spring relative to a pivot axis, and an outer coil fixed, at a second, opposite end, to a hooking element. A coil of the balance spring includes a finger that includes a feeler spindle stud that is mounted integrally with the coil. The feeler spindle stud is moveable without any contact, during the normal extension and contraction of said balance spring, in the radial travel limiting channel of the flange. The radial travel limiting channel limits travel of the finger relative to the pivot axis when an angle of pivoting imparted to the collet is greater than a determined nominal value.

Abstract: The invention relates to an assembly system including a member made of at least a first material including a staff and a shoulder, the staff of the member being received in an aperture of a part made of a second material having little or no plastic domain. According to the invention, the assembly system includes a locking element made of a third material arranged to elastically attach the part between the shoulder of said member and the locking element and in that the locking element is a washer whose internal wall radially grips the staff of said member and whose peripheral portion exerts an elastic radial force vertical to the shoulder of said member in order to secure the assembly of the member-part-locking element.

Abstract: The invention relates to an assembly system including a member made of a first material including a staff and a shoulder, the staff of the member being received in an aperture of a part made of a second material having little or no plastic domain. According to the invention, the assembly system includes a locking element made of a third material arranged to elastically attach the part between the shoulder of the member and the locking element and the locking element is a conical washer including an internal wall which radially grips the staff of the member, and a peripheral portion of the locking element which exerts an elastic radial force vertical to the shoulder of the member in order to secure the assembly of the member—part—locking element.

Abstract: An assembly including a member made of a first material, which is axially driven into a circular aperture of a part made of a second material that is brittle, using an intermediate part made of a third material and mounted between the member and the part is disclosed. The intermediate part is a continuous cylinder including a hole for receiving the member so that the intermediate part absorbs radially and in a uniform manner, at least part of the axial driving force of the member. The part includes pierced holes forming elastic deformation units distributed around the circular aperture thereof for absorbing any of the radial force not absorbed by the intermediate part, so as to secure the assembly in a non-destructive manner for the part.