Patent ID: 7959352
Filing Date: 2011-06-14
Classification: G04B

Abstract:
1. A winding crown assembly for a timepiece including: a. a crown; b. an uncoupling mechanism comprising wherein the rigid ring cooperates with the elastically deformable element to drive the elastically deformable element in at least one rotational direction until a resistant torque opposed by the elastically deformable element exceeds a threshold value beyond which the elastically deformable element is deformed so as to interrupt the drive connection with the rigid drive ring; wherein the elastically deformable element further comprises coupling portions arranged to temporarily couple the elastically deformable element to the rigid drive ring, and centering portions arranged to center the elastically deformable element within the rigid drive ring, wherein the elastically deformable element is of substantially circular shape; wherein an inner perimeter of the rigid drive ring has an uninterrupted series of bumps and hollows which respectively define first and second inner diameters, the first inner diameter being smaller than the second inner diameter; wherein the centering portions are arranged diametrically opposite to each other on the perimeter of said elastically deformable element; wherein the elastically deformable element includes two arms each having one centering portion and one coupling portion; and wherein the centering portions have the shape of an arc of a circle which defines a first external diameter of the elastically deformable element equal to the first inner diameter of the rigid drive ring, the length of said centering portions being such that said centering portions always rest on two successive bumps on the inner perimeter of the rigid drive ring, and wherein the coupling portions have protruding portions the tips of which define a second external diameter of the elastically deformable element which is larger than the first inner diameter of the rigid drive ring.