Anti-shock collet

Abstract

The collet, which can be made in one piece at the same time as the spring, is formed by a plate (1) which comprises an opening (3) for mounting on a balance staff (5) and has an asymmetric outline (9) which follows at an approximately constant distance d with the outline of the first turn (11) of the curve. The plate may also have recesses (13) enabling the centre of gravity g to be repositioned on the balance staff (5).

Description

technical field [0001] The invention relates to a collet integrated with the hairspring of the hairspring balance regulating system of a mechanical timepiece movement, the shape of the collet has been studied in order to minimize the collet-hairspring joint area in the event of shocks or the risk of damage to the joints is minimized. Background technique [0002] In a mechanical timepiece movement, the balance sprung regulating system constitutes one of the most vulnerable parts of the mechanism, especially in the event of a shock that can damage the pivoting stem of the balance shaft, or even the collet- Hairspring at the hairspring joint. To avoid this danger to the balance shaft, solutions proposed long ago consisted in providing shock-absorbing bearings, such as "Incabloc" bearings. This shock-absorbing bearing also helps protect the hairspring, but it is not enough when shocks cause a large amount of travel or deflection of the hairspring and create tension at the col...

AI Technical Summary

Problems solved by technology

When the balance spring is made of a brittle material such as silicon, single crystal quartz or glass, and / or as disclosed in European Patent No. 1445 670, the balance spring is produced simultaneously with the collet by micromachining techniques or photolithography and electrogrowth The risk of damage is further increased when integrated into an integral part

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