| abstract |
This screw comprises: - a rod (2) with a threaded part (3) and a section (4) with a polygonal profile (P) - a cap (20) forming an operating head (21) and extending by a skirt ( 22) surrounding the section (4) with polygonal profile (P) and provided, on its internal face, with reliefs (23), and - an elastic ring housed (30) between the section (4) with polygonal profile (P) and the skirt (22), this ring being provided, on its outer radial surface, with reliefs (33) able to cooperate with the reliefs (23) of the skirt (22) for driving the ring (30) in rotation, and, on its internal radial surface, at least one lug (34) capable of transmitting a rotational movement of the ring (30) to the rod at its section (4) with polygonal profile (P) and of sliding on this polygonal profile (P) when the resistance force of said rod (2) is greater than a predetermined value. |