Securement device adapted to retain in a predetermined position a first member on a second member

In a securement device adapted to retain in a predetermined position a first member (1) on a second member (2), and comprising respectively a securement member (3-18) having a relatively rigid foot (4-25) adapted to be secured to a first member and prolonged by a body (5-19) having on at least one region of its lateral surface a protruding elastic hooking means (7-20), and a seat (8-23) provided in the second member of which the internal side wall (9-24') has a shape of revolution, and adapted to receive with friction the body (5-19) and the hooking means (7-20);

• the improvement wherein the securement member (3-18) and the seat (8-23) comprise mutual unlocking means (13-22-24) permitting, by a movement of rotation between the securement member (3-18) and the seat (8-23), the escape of the hooking means (7-20) from the side wall (9-24') of the seat (8-23), the body (19) of the securement member (18) having the general shape of a cylindrical barrel, the hooking means being formed by a plurality of small annular collars (20) each having the general shape of a truncated cone whose summits (21) are turned toward the free end of the body, the mutual unlocking means comprising on each small collar (20) a flat (22) provided on its peripheral edge and in the seat (23) a longitudinal flat (24) provided in its internal side wall (24').