Patent ID: 7182508

Claim:
A linking device between a rim and a case of a watch comprising a first axial retention shoulder secured to the case, adjacent to a cylindrical seat, a second, opposite axial retention shoulder formed by one face of an annular groove secured to the rim, an annular retention element made of polymer bearing against each of said shoulders, said first shoulder being adjacent to the base of a conical surface, secured to the case, for the axial introduction of said annular retention element engaged with said annular groove, this annular retention element allowing the removal of the rim when a force greater than its resistance is applied to the rim, wherein said annular retention element forms a full endless ring whose section is divided in the radial direction into two portions of which one is, perpendicularly to the plane of said ring, substantially thinner than the other, these two portions being intended to interact respectively with said first shoulder and second shoulder and wherein the radial dimension of said first axial retention shoulder lies between one and two times the diametral clearance between the rim and said outer circular surface of said retention element forming a surface for positioning the rim.