A balance for a horological movement, including rigid parts including a hub defining the pivot axis of the balance, a felloe sector, at least one arm connecting the felloe sector to the hub, and including a slot for receiving and gripping an inertia-block in position, the slot opening into a housing delimited on the one hand by a rigid part of the balance, and on the other hand an elastic arm including a first end integral with a rigid part of the balance, and a second free distal end. The elastic arm has a hook-shaped body, the free distal end of the hook being parallel to a part of the balance having a rigidity greater than or equal to that of the elastic arm.

A balance for a horological movement, including rigid parts constituted by a hub defining the pivot axis of the balance, at least one felloe sector, at least one arm connecting the at least one felloe sector to said hub, and including a slot for receiving and gripping in position an inertia-block, the slot opening into a housing delimited on the one hand by a rigid part of the balance, and on the other hand an elastic arm including a first end integral with a rigid part of the balance, and a second free distal end. The elastic arm can have a body of a non-constant section, a part of the body having a greater thickness than the rest of the elastic arm so as to have a larger volume of material under stress and store a maximum of elastic energy.

A balance of a timepiece including an adjustment face provided with at least one recess provided for receiving a projected material for an implementation of an adjustment of the rate of the timepiece notably by the modification of the inertia and of the unbalance of the balance, the recess including an opening and a back notably a solid back or a back fully or partially forming an orifice, the back being at most partially visible from a position defined above the opening notably on a central axis of the opening.

Disclosed is a flexible-pivot mechanical component of the type with separate intersecting blades, particularly for timepieces. The mechanical component includes an attachment portion and a movable portion that are connected by first and second resilient blades that intersect in a contactless manner at an intersecting point. The flexible-pivot mechanical component is combined with an adjustment unit making it possible to adjust the position of the intersecting point.

A process for producing a metal alloy balance wheel by molding, the process including the following steps: a) making a mold in the negative shape of the balance wheel, b) getting hold of a metal alloy that has a thermal expansion coefficient of less than 25 ppm/ C. and is able to be in an at least partly amorphous state when it is heated to a temperature between its glass transition temperature and its crystallization temperature, c) putting the metal alloy into the mold, the metal alloy being heated to a temperature between its glass transition temperature and its crystallization temperature so as to be hot-molded and to form a balance wheel, d) cooling the metal alloy to obtain a balance wheel made of the metal alloy, e) releasing the balance wheel obtained in step d) from its mold.

The invention relates to a device (1) for pinning up to the stud and setting an active length of a balance-spring (2) for a horological movement, this balance-spring (2) being arranged in coils along a determined length, this device (1) comprising a push-button (6) arranged to hold the balance-spring (2) mechanically at a location of the length of this balance-spring (2).

The invention also relates to a process for setting the active length of the balance-spring by means of the device (1) for setting and adjusting the active length of the balance-spring.

Watch comprising a movement, with a timepiece balance wheel comprising a ring distinct from the balance rim, carried by a flange with respect to which this ring is movable in rotation to modify the position of inertia blocks elastically carried by the flange, each able to be indexed in different stable angular positions corresponding to a different inertia of the timepiece balance wheel, the movement further including an operating member movable between coupled and uncoupled positions which includes a stop means for immobilizing the rim in a coupled position, and a control means for rotating the ring to modify the position of the inertia blocks in the coupled position, the watch including a crown controlling the control means, a rotating coupling ring controlling the coupling/uncoupling of the operating member through contactless interaction with an external adjustment tool.

Disclosed is a flexible-pivot mechanical component of the type with separate intersecting blades, particularly for timepieces. The mechanical component includes an attachment portion and a movable portion that are connected by first and second resilient blades that intersect in a contactless manner at an intersecting point. The flexible-pivot mechanical component is combined with an adjustment unit making it possible to adjust the position of the intersecting point.

Timepiece movement (300) including a regulating system (150) and an adjustment device (200), the regulating system (150) having a frame (6), an assembled balance (4) pivoted in relation to the frame (6) about a geometric axis (A4) and having movable screws or inertia blocks (43a, 43b and 44a, 44b) for adjusting the inertia of the assembled balance (4), an elastic return system (1, 2, 3) intended to link the assembled balance (4) to the frame (6) so that the assembled balance (4) and the elastic return system (1, 2, 3) form an oscillator (100), the elastic return system (1, 2, 3) having a first elastic return element in the form of a first hairspring (1) having a first stiffness k1, a second elastic return element (2) having a second stiffness k2, and a third elastic return element (3) having a third stiffness k3, the first elastic return element (1) and the second elastic return element (2) being assembled in series between the assembled balance (4) and the frame (6), and the third elastic return element (3) and the second elastic return element (2) being assembled in parallel between the frame (6) and the first elastic return element (1).

A balance wheel-spring system including a balance wheel that oscillates about a balance wheel shaft and a spring, one inner spiral of which is fixed to the balance wheel shaft or to a collet mounted integrally with the shaft and one outer spiral of which is fixed to a stud integral with a bridge. The balance wheel includes a hub, a rim, an arm connecting the hub to the rim, a front face which includes a countersink and a rear face, the arm including a housing receiving and retaining a flyweight, and the spring being mounted opposite the front face of the balance wheel. The flyweight is mounted on the arm on the rear face of the balance wheel, the distance between the bottom of the countersink of the front face of the balance wheel and the spring is a predetermined interval between 0.05 mm and 1.50 mm.