Integral assembly of a hairspring and a collet

摘要

An integral assembly of a single or double hairspring and an unsplit collet including two portions opposite one another for receiving the balance staff, one portion including one of the bearing surfaces (2 or 3) for the balance staff and a point (10, 11) for attaching the hairspring, and the other portion including another bearing surface (4, 5 or 14) for the balance staff, the two portions being connected together by two linking portions that are less rigid than the receiving portions so as to be capable of elastically deforming during the fitting of a balance staff. According to another aspect, the invention also relates to an integral assembly of a hairspring and a collet, including at least two stages, as well as to a method for manufacturing such an assembly.

主权项

1. A hairspring-collet assembly comprising (i) a hairspring and (ii) a collet comprising a bore intended to receive a balance staff, at least a first part and a second part, the first and second parts being separated by a plane perpendicular to the axis of the bore, an element for attaching the collet to a hairspring being exclusively located on the first part and an element for connecting the collet to the balance staff being essentially located on the second part,
wherein an attachment point of the hairspring to the collet lies at a distance from the center of the collet that is less than half the diameter of a cylinder inside which the second part can be inscribed; wherein the attachment point is defined as a point at which a local rigidity along a neutral axis of the hairspring reaches a value that is 10 times higher than a minimum value of a local rigidity along the hairspring.