Isochronous pivot for a resonator including two flexible strips joining attachment points of a first and a second element, defining two strip directions, and a pivot axis, at the intersection of their projections or at their intersection, each strip having a free length between its attachment points, and an axial distance between the pivot axis and the attachment point thereof farthest from the axis, the attachment point ratio X=D/L being greater than one for each strip, the strip directions defining with the axis a first apex angle whose value in degrees is comprised between f1(X)=108+67/(10X6), and f2(X)=113+67/(10X6).

Isochronous pivot for a resonator including two flexible strips joining attachment points of a first and a second element, defining two strip directions, and a pivot axis, at the intersection of their projections or at their intersection, each strip having a free length between its attachment points, and an axial distance between the pivot axis and the attachment point thereof farthest from the axis, the attachment point ratio X=D/L being greater than one for each strip, the strip directions defining with the axis a first apex angle whose value in degrees is comprised between f1(X)=108+67/(10X6), and f2(X)=113+67/(10X6).

An isochronous pivot for a resonator including two flexible strips joining attachment points of a first and a second element, defining two strip directions, and a pivot axis, at the intersection of their projections or at their intersection, each strip having a free length between its attachment points, and an axial distance between the pivot axis and the attachment point thereof farthest from the axis, the attachment point ratio X=D/L being greater than one for each strip, the strip directions defining with the axis a first apex angle whose value in degrees includes between f1(X)=108+67/(10X6), and f2(X)=113+67/(10X6).

An isochronous pivot for a resonator including two flexible strips joining attachment points of a first and a second element, defining two strip directions, and a pivot axis, at the intersection of their projections or at their intersection, each strip having a free length between its attachment points, and an axial distance between the pivot axis and the attachment point thereof farthest from the axis, the attachment point ratio X=D/L being greater than one for each strip, the strip directions defining with the axis a first apex angle whose value in degrees includes between f1(X)=108+67/(10X6), and f2(X)=113+67/(10X6).

A mechanism for adjusting an average speed in a timepiece movement comprises an escapement wheel and a mechanical oscillator, in which a plurality of blades, which are resiliently flexible in an oscillation plane, support and return a balance in such a way that this balance oscillates at an angle in the oscillation plane. A pallet fork comprises two rigid pallets which are rigidly connected to the balance and are arranged to co-operate alternately with a toothing of the escapement wheel when the balance oscillates at an angle.

A flexible pivot includes a first stage including a first cylinder and interface structure and a second stage including a second cylinder and interface structure in axial alignment with those of the first stage. Flexible connecting members are arranged for connecting the first and the second stages. Each flexible connecting member includes a pair of legs and a cross member joining the legs, each leg extending in a direction transverse to the axis of the cylinders, the legs being attached to the first and the second cylinders respectively. The first cylinder and the first interface structure are concentric. Flexible spokes are attached to the first cylinder by one end and to the first interface structure by the other. Each spoke extends in a direction transverse to the axis of the cylinders. Finally, the second stage includes flexible connection unit arranged to connect the second cylinder to the second interface structure.

A device for holding a wheel set of a timepiece movement mounted on a main plate includes a lever, intended to be mounted to slide on the main plate of the timepiece movement between a first and a second position and arranged to move in translation between the two positions. The lever includes, at a first end, a locking beak cooperating with a slot of a ring attached to the wheel set to hold and to guide the wheel set in rotation in the first position, and leaving the wheel set free in the second position, the lever being arranged to move in translation, between the retracted position and the deployed position.

A device for holding a wheel set of a timepiece movement mounted on a main plate includes a lever, intended to be mounted to slide on the main plate of the timepiece movement between a first and a second position and arranged to move in translation between the two positions. The lever includes, at a first end, a locking beak cooperating with a slot of a ring attached to the wheel set to hold and to guide the wheel set in rotation in the first position, and leaving the wheel set free in the second position, the lever being arranged to move in translation, between the retracted position and the deployed position.

A bearing (1a) for guiding a timepiece shaft about an axis, notably a guide bearing for a portion of a timepiece resonator shaft, comprising at least one pressing element (13a) arranged in such a way as to constantly exert an action on the shaft, radially or substantially radially with respect to the axis.

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.