A spiral spring, in particular for a horological resonator mechanism, the spiral spring (30) extending substantially in a plane, the spiral spring (30) including a flexible strip (2) coiled on itself in a plurality of turns, the strip (2) having a predefined rigidity, the spiral spring (30) including means for adjusting its rigidity, wherein the adjustment means comprise a flexible element (5) in direct contact with the strip (2), the flexible element (5) preferably having a rigidity greater than that of the strip (2), the adjustment means including prestressing means (6) for applying a variable force or torque to the flexible element (5) so as to vary the rigidity of the flexible element (5).

A non-magnetic watch component (1) comprising a substrate (4) made of a copper alloy, wherein at least one part of the substrate (4) has a surface layer (5) including Cu.sub.xTi.sub.y intermetallics, and a method for manufacturing this watch component.

A regulator key whose arms ensure clearance of a balance spring even in event of shocks.

Horological device (100) comprising two oscillators (1a,b) with rotating and spiral (12a,b) balance wheels (11a,b), coupled for their synchronization. The oscillators (1a,b) are identical and their axles (22a,b) are parallel. The spirals (12a,b) are connected to a shared stud (13) by a link in the same direction but in the opposite direction, the stud being fixed to the rest of the horological movement.

A non-magnetic watch component (1) comprising a substrate (4) made of a copper alloy, wherein at least one part of the substrate (4) has a surface layer (5) including CuxTi.sub.y intermetallics, and a method for manufacturing this watch component.

A deposition method (500) of an electroconductive layer electrically connecting at least one outer coil (105) and a balance-spring stud (102) and representing at least 1%, particularly 5%, preferably 10% and/or at most 90%, particularly at most 75%, preferably at most 50% of at least one dimension of a horological balance-spring (101).

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.

Horological device (100) comprising two oscillators (1a,b) with rotating and spiral (12a,b) balance wheels (11a,b), coupled for their synchronization. The oscillators (1a,b) are identical and their axles (22a,b) are parallel. The spirals (12a,b) are connected to a shared stud (13) by a link in the same direction but in the opposite direction, the stud being fixed to the rest of the horological movement.

A regulator key whose arms ensure clearance of a balance spring even in event of shocks.