Ring for assembling hairspring on balance staff in mechanical clock movement, has nose comprising receiving surface that forms outer contour of ring at radial end of nose remote from pivot axis, and forms point of ring remote from axis

摘要

The ring (1) has a receiving and centering unit (6) for receiving and centering a balance staff with respect to a pivot axis (D). The unit has a nose (2) projecting radially with respect to the axis and comprising a receiving surface (4) to receive an end of a hairspring. The unit forms a female prism extending parallel to the axis according to a profile. The receiving surface is located on an edge (7) parallel to the axis. The receiving surface forms an outer contour of the ring at a radial end of the nose remote from the axis, and forms a point of the ring remote from the axis. An independent claim is also included for a balance-hairspring assembly.