Abstract: Quick coupler for coupling a tool on a working arm of a public works machine, with two connection components equipping the tool, two coupling components for coupling with the connection components, a security component mounted for free rotation, at least one locking component, a translationally movable release component adapted to allow the security component to rotate. The release component with at least one translationally movable part adapted to be in contact with at least one surface, the shape of which is adapted to that of the security component, and a security component with at least one surface adapted to be in sliding contact with at least one complementary shaped surface of a connection component, the sliding contact inducing a rotation of the security component when the connection component moves out of its accommodation housing defined by the first coupling component.

Abstract: An implement attachment is coupled to a working arm of a working machine. The arm is connected to an implement attachment by fastener sleeves and fastener pins. The attachment includes two side plates, each carrying two bushes having holes for accommodating the fastener pins. The bushes have a circular guide portion fitting into a circular hole in respective side plates. Each bush has a flange connected to the side plates by a fastener. The hole receiving the fastener pins is eccentric to the guide portion with respect to at least two of the bushes. As a result, the implement attachment is readily mounted on mutually different working arms.

Abstract: The invention concerns a coupler comprising a cam (211) for locking a tool (100) with the coupler (200), characterized in that the cam (211) comprises for bringing the cam into a locking position, an articulation (213) with a connecting rod (209) itself connected through a bearing (206) to a piston (209) mobile in a bore (203) of the coupler body (200), said piston being subjected to the action of a spring (208), a chamber (220), opening on to a conduit (223), being formed by the piston (205) and the base of the bore (203), and means (215) for being connected to an unlocking object for applying an unlocking torque on the cam.