Patent ID: 8317391

Claim:
A pivoting device for an arbour in a timepiece, including two pivots each forming one end of the arbour and two bearings for receiving the two pivots, each of the two pivots including, close to the end, an approximately cylindrical portion and a convex rounded portion that continues the approximately cylindrical portion and gradually tapers in the direction of the end, each of the two bearings including a pivoting structure held in place elastically, the pivoting structure including an approximately cylindrical passage traversed by said approximately cylindrical portion of one of the pivots and a bearing surface against which the end of said pivot will abut, wherein the pivoting structure of each of the two bearings includes an aperture of circular or polygonal section, said aperture having a portion of inverted triangular or trapezoidal profile whose inclined, inner wall forms said bearing surface, and wherein said convex rounded portion of one of the pivots is for abutting against said inclined inner wall so that the arbour is held axially between the inclined walls of the apertures of the two bearings.