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.

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.

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.

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.

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.

The invention relates to a balance-spring stud-holder for a mechanical timepiece movement, which comprises a pair of tabs, namely a front tab and a rear tab, jointly defining a notch, the tabs being arranged in such a way that a balance-spring stud can be held in the notch, wherein the rear tab of the balance-spring stud-holder comprises an extension which defines, beyond the notch, a bend forming a retaining abutment for the balance-spring stud after said balance-spring stud has been extracted from the notch.

The invention relates to a balance-spring stud-holder for a mechanical timepiece movement, which comprises a pair of tabs, namely a front tab and a rear tab, jointly defining a notch, the tabs being arranged in such a way that a balance-spring stud can be held in the notch, wherein the rear tab of the balance-spring stud-holder comprises an extension which defines, beyond the notch, a bend forming a retaining abutment for the balance-spring stud after said balance-spring stud has been extracted from the notch.

A balance-spring, in particular for a horological resonator mechanism, the balance-spring including a flexible strip coiled on itself into several coils, the strip having a predefined flexibility, the balance-spring including a device for adjusting its flexibility, the adjustment device including an elastic element in direct contact with the strip, the elastic element preferably having a flexibility less than that of the strip, the adjustment device including a prestressing device to apply a variable force or torque to the elastic element, so as to vary the flexibility of the elastic element, the elastic element and the strip being separate and assembled with each other. An horological resonator mechanism including such a balance-spring is also disclosed.

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.

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.