Device for fastening a rotationally symmetrical piece, in particular a rotating ring, a back cover, and/or a watch crystal to a watch case

摘要

The fixing device uses a rotationally symmetrical projection (5) extending in the axial direction of the timepiece housing (1), with a peripheral channel (8) in its inner or outer mantle surface (6,7) for each component (2,3,4) to be secured. At least 2 notches (9.1) are spaced around the periphery of the channel, for receiving pin projections (11.1) of the component, allowing a limited degree of relative rotation.