Patent ID: 8468650

Claim:
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 ( 20 a ) above the piston ( 21 ) and a second side ( 20 b ) below the piston ( 21 ), and said piston ( 21 ) comprising: at least one helical thread ( 23 ) in engagement with a corresponding thread ( 24 ) on one element selected from the pair consisting of the cylinder barrel ( 19 ) and the damper shaft ( 22 ), and a rotation-preventing member in engagement with a guide ( 25 ) on the other one of element selected from said pair consisting of said damper shaft ( 22 ) and said 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 ( 20 a ) to said second side ( 20 b ) 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 ( 20 a , 20 b ) of the cylinder cavity ( 20 ), with a flow restrictor, adjustable through an orifice in the cylinder barrel ( 19 ), wherein said second side ( 20 b ) of the cylinder cavity ( 20 ) and said orifice are at opposite sides of the flow restrictor.