Patent ID: 8567011

Claim:
A closing mechanism for a hinged member hinged to a structure, which closing mechanism comprises an actuator comprising: an output member arranged to be connected to said hinged member; a resilient element connected to said output member so as to urge the output member in a first direction to close said hinged member; and an hydraulic rotation damper; which comprises: a closed cylinder cavity within a cylinder barrel; a rotational damper shaft which extends into the cylinder cavity; a piston dividing the cylinder cavity into a first side and a second side, and comprising: at least one helical thread in engagement with a corresponding thread on the damper shaft, and a rotation-preventing member in engagement with a guide for said rotation-preventing member on said cylinder barrel, so that, by cooperation of the helical thread on the piston with the corresponding thread on the damper, a rotational motion of the shaft with respect to the cylinder barrel results in a translational motion of the piston along a longitudinal axis of the shaft; and a restricted fluid passage between said first and second sides; said damper shaft being connected over a gearing to the output member and the resilient element of the actuator for damping movement of said output member in said first direction.