Door closing mechanism

A mechanism (C) for closing a hinged member (H) comprising a resilient element (8 or 51) for effecting closure of the hinged member (H) and a hydraulic rotation damper (5) for damping the closing movement of said hinged member (H), which damper comprises:

• a closed cylinder cavity (20) which has a longitudinal axis and which is defined by a substantially cup-shaped cylinder barrel (19);
• a rotational damper shaft (22) which extends through an opening at a top of the cylinder barrel (19) into the cylinder cavity (20) and which is rotatable with respect to said cylinder barrel (19) substantially around said longitudinal axis;
• a piston (21), placed within said cylinder so as to divide the cylinder cavity (20) into a first side (20a) above the piston (21) and a second side (20b) below the piston (21), and said piston (21) comprising:
• at least one helical thread (23) in engagement with a corresponding thread (24) on either the cylinder barrel (19) or the damper shaft (22), and
• a rotation-preventing member in engagement with a guide (25) on the other one of said damper shaft (22) or cylinder barrel (19), so that a rotational motion of the shaft (22) with respect to the cylinder barrel (19) results in a translational motion of the piston (21) along said longitudinal axis;
• a one-way valve (33) allowing fluid flow from said first side (20a) to said second side (20b) of the cylinder cavity (20) when opening the hinged member (H);
• characterised in that it further comprises:
• a fluid passage between said first and second sides (20a,20b) of the cylinder cavity (20), with a flow restrictor, in particular in the form of a needle valve (32), adjustable through an orifice in the cylinder barrel (19), wherein said second side (20b) of the cylinder cavity (20) and said orifice are at opposite sides of the flow restrictor.