Shock-absorber device for balance pivot and watch movement fitted with the same

Abstract

The invention proposes a shock-absorber device for the balance pivot of a watch movement comprising a jewelled setting which is held resiliently by a spring in a complementary housing arranged on a fixed support and which is fitted with a jewel forming an endstone, of the type wherein the spring is formed by a metal strip which is fixed on the support so as to overhang, which extends in a radial plane in relation to the pivot, and which forms an arm including a securing end, and an abutting end abutting axially against the endstone so as to hold the jewelled setting axially in its housing, characterized in that the arm includes, from the securing end, a section generally rectilinear and parallel to a radial direction, relative to the axis of the pivot, a resilient section in the form of an annular sector and an abutting sector which extends generally along a diametral direction substantially perpendicular to the rectilinear sector so as to form the abutting end. The invention also proposes a watch movement fitted with a device of this type.

Description

technical field [0001] The invention relates to a shock absorber arrangement for a balance pivot of a watch movement. [0002] The invention relates more particularly to a shock absorber arrangement for a watch movement, in particular for a balance wheel pivot, comprising a jewel seat held elastically by a spring on a support arranged on a fixed In a complementary bearing seat (shaped) on the upper part and fitted with a jewel forming an endstone, the spring is formed by a metal strip fixed so as to protrude above the support in a radial plane of the pivot Extending inwardly, and forming an arm comprising a fixed end and an abutment end, the abutment end axially abuts on the endstone to axially retain the jewel holder in the bearing seat of the jewel holder. Background technique [0003] A shock absorber arrangement of this type is disclosed and shown in CH Patent No. 237 999 in particular. In this patent, the fixed end of the spring arm is remote from the endstone, and a ...

AI Technical Summary

Problems solved by technology

[0004] Due to the large moment arm between the abutment end and the fixed end, it is difficult to precisely control the strength of the restoring force exerted by the spring on the endstone, which adds difficulty to the development of this type of shock absorber device

In addition, the strength of the restoring force of the spring is limited. When it is desired to change the characteristics of the restoring force, the spring arm must be changed integrally over the entire length.

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