An assembly for holding or supporting a timepiece balance spring, includes a balance spring stud and a stud-holder, the stud-holder includes a base having at least one circular portion, the base including, on the circular portion, a first lug and a second lug each extending radially. One of the two lugs includes an elastic arm extending from the lug, in a direction parallel to that of the base, towards the other lug, the elastic arm forming with the base a housing for housing the balance spring stud therein and the first and second lugs are able to cooperate with a tool to allow the balance spring stud to exert a stress on the elastic arm to deform the latter and permit the assembly or disassembly of the stud.

Method for attachment of a last outer coil of a timepiece balance spring inside a groove provided in a balance spring stud, wherein the method includes the step of adhesive bonding the last outer coil of the timepiece balance spring by means of a fluid adhesive whose viscosity is comprised between 200 and 400 mPa.Math.s.

A resonator of the inertia/elasticity type includes a balance-spring coupled to an inertia flywheel and a system for adjusting the frequency of the resonator including an index-assembly arranged to cooperate with one coil of the balance-spring in order to selectively choose the active length of the balance-spring. The portion of the coil of the balance-spring cooperating with the index-assembly includes at least one area of larger cross-section than the other balance-spring coils for finer adjustment of the frequency of the resonator.

A stud includes a support portion formed into a shape of a column, and a spring receiving portion being provided on the support portion and including a slit portion to which a hairspring is to be inserted and fixed. The spring receiving portion is formed into a truncated conical shape centered on a center line that passes through the center of the column. The groove that forms a constricted portion on an outer periphery is provided between the support portion and the spring receiving portion. The slit portion is a notch portion that is formed from an upper surface toward a bottom surface of the spring receiving portion in the truncated conical shape, and thrusts into a portion of the groove.

A device for assembling and adjusting a balance spring, comprising a base joined to a balance bridge with an adjustable angular orientation, and comprising a bearing surface and a bearing plate adjacent to the bearing surface, both defining a service position of the end turn of the balance spring. A first arm extends from the base and bears a locking member for the end turn, said locking member being designed to keep the terminal coil in abutment against the bearing surface. The device comprises a second arm that extends from the base and bears a shoe that is able to be arranged at a predefined distance from the bearing surface so as to cooperate with the end turn. A movable control member is able to act on the second arm in order to deform it elastically and move the shoe with respect to the base in order to free the end turn.

An assembly for holding or supporting a timepiece balance spring, including a balance spring stud and a stud-holder, wherein the stud-holder includes a base having at least one circular portion, the base including, on the circular portion, a first lug and a second lug each extending radially; one of the two lugs including an elastic arm extending from the lug, in a direction parallel to that of the base, towards the other lug, the elastic arm forming with the base a housing for housing the balance spring stud therein and in that the first and second lugs are able to cooperate with a tool to allow the balance spring stud to exert a stress on the elastic arm to deform the latter and permit the assembly or disassembly of the stud.

The present invention concerns an assembly for holding or supporting a timepiece balance spring, comprising a balance spring stud and a balance cock on which is fixed a balance spring stud-holder, wherein said stud-holder comprises a holding means provided with a housing for housing the balance spring stud therein and a gripping means, at least said gripping means being movable with respect to the holding means in order to lock the balance spring stud inside its housing.

Timepiece sub-assembly including a balance spring stud arranged to be fastened to a balance cock, and a balance spring comprising an outer coil and an end plate of larger section than that of the outer coil, this stud including a housing arranged, in a first free state of the sub-assembly, to loosely contain the end plate with tangential mobility with respect to the outer coil, and, in a second immobilized state of the sub-assembly, to immobilize the end plate to which the housing is joined by a layer of adhesive covering a change-of-section shoulder and which forms a mechanical seal for the balance spring in a longitudinal direction of the housing, and the end plate includes an eye communicating with the layer in the second immobilized state.

A timepiece balance spring made of micromachinable material including a plurality of stages, each forming a spiral wound spring, parallel to each other and all attached to a common axial collet or to the same balance staff, each stage including, at its respective outer end, its own attachment to a balance spring stud which are independent of those of the other stages, the attachment including a position adjustment with respect to a balance spring stud which are also independent of those of the other stages, the attachment and the position adjustment together forming built-in isochronism correction mechanism for the balance spring, and the position adjustment including a plurality of discrete position adjustment positions including housings each arranged to retain a stud.

A regulating member (1) for a horological movement including an inertial mass, for example a balance (23), a balance spring (25), a balance bridge (22), and an index system (20) for adjusting the rate of the balance spring (25), the index system (20) including a stud-holder (31) including a first stud (34) on which the balance spring (25) is mounted. The balance bridge (33) includes a second stud on which the balance spring (25) is also mounted, the stud-holder (31) being rotatable relative to the balance bridge (33) in order to adjust the rate of the regulating member (1).