Patent ID: 8845185
Filing Date: 2014-09-30
Classification: F16F,G04B

Abstract:
1. A spiral spring of a watch movement, comprising: a single collet; a rigid frame provided with at least one portion to receive an attachment organ; and a plurality of coplanar leaves wound into one another and defining n leaves offset from each other by 360°/n, wherein inner ends of each leaf is secured to the single collet, wherein the leaves and the collet are made monolithically, wherein outer ends of each leaf are connected to each other by the rigid frame, wherein said frame, the leaves and, the collet being made monolithically and define a single monolithic piece, wherein the frame forms an arc of circle, with an angle that is a multiple of 360°/n, and wherein the frame includes wide zones and at least one slim zone, said slim zone being able to receive a balance-spring stud to attach the spiral spring to the watch movement, and said wide zones are free of any aperture.