Patent ID: 9411314
Filing Date: 2016-08-09
CPC Classification: G04B,Y10T

Claim Text:
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.