Patent ID: 7308963

Claim:
Locking device for an articulation having two parts rotatably mounted upon each other around a longitudinal axis (x′x), wherein said locking device comprises two pieces integral in rotation, respectively, which each of said articulated parts, respectively a piece forming a collar ( 61 ) having an internal cylindrical face centered on said longitudinal articulation axis (x′x) and a piece forming a bracket ( 64 ) extending transverse to articulation axis (x′x) and having an end spaced from said axis (x′x), and a pendulum type locking piece ( 62 ) suspended to said spaced end of bracket ( 64 ) and mounted oscillating around an axle ( 63 ) parallel to articulation axis (x′x) and located in a plane (P 2 ) passing by a said axis (x′x), said pendulum locking piece ( 62 ) having a lower end ( 66 ) spaced from internal face of collar ( 61 ) by a narrow clearance and resting 15 on said internal face in case of inclination of plane (P 2 ) in which is located the suspension axle ( 63 ) in relation to the apparent vertical direction that is to say the resultant of gravitational and centrifugal forces, causing buttressing of said pendulum piece ( 62 ) on collar ( 61 ) and locking of the articulation.