| 摘要 |
1. A U-sectioned collar made from a sheet blank, comprising two tabs (6, 7) each provided with an aperture (13, 14) for the passage of a clamping screw (5), characterized in that one of the tabs (7) is folded (at 10 or 10a) so as to form two roughly parallel portions (8, 9) in which are formed two apertures having an internal screwthread (15, 16) cooperable with the clamping screw, these two internal screwthreads being, in the free state, slightly offset relative to each other axially and/or angularly. |
