Patent ID: 8485719
Filing Date: 2013-07-16
Classification: G04B

Abstract:
1. A pivot organ designed to allow the rotation of a piece of a clockwork movement around an axis of rotation AA, comprising two elements, i.e. a pivot and a bearing receiving said pivot, one of said elements being arranged to be integral with said piece and the other being arranged to be integral with a frame of said movement, said elements having, at their opposite surfaces, shapes such that the section of one of the elements along a plane perpendicular to the axis of rotation AA is circular, the cross-section of the other element along said plane being non-circular, so as to reduce the contact surface between the pivot and the bearing, wherein at least the contact surfaces of the two elements against each other are made from at least one material ensuring its own lubrication, having a coefficient of friction less than or equal to 0.1 and a hardness greater than or equal to 9 on the Mohs scale.