Door closer
AssigneeOy Wartsila Ab
InventorsMarkku Kuivalainen, Hannu Pehkonen
Life of this patent
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Abstract
A door closer is connected to a door. The movements of the door cause a piston member in the door closer to pump a pressure medium through a flow duct. There is also a flow limiting member influencing at least the speed of the opening movement of the door, and this flow limiting member cooperates with an adjustable activating element which, at a desired opening moment mechanically sets the elements of the flow limiting member in a position considerably increasing the flow resistance of the pressure medium. This brakes the movement of the piston member, and thus, also the movement of the door.
Claims11
A door closer comprising a movable piston member including a main flow duct with a movable valve body;
- said piston member having a power transmitting connection to a door;
- a pressure medium and chambers;
- the movements of said door causing said piston member to pump said pressure medium within said door closer from one of said chambers to another of said chambers through said main flow duct;
- said piston member further comprising a flow limiting member including a throttled duct and influencing at least the speed of the opening movement of said door;
- an adjustable activating element;
- said flow limiting member being arranged to cooperate with said adjustable activating element, said activating element being arranged in a desired opening phase of said door to mechanically move said valve body into a position closing said main flow duct to force said pressure medium to flow through said throttled duct, for substantially increasing the flow resistance of said pressure medium to brake the movement of said piston member and thereby to brake the movement of said door.--
Dependencies are inferred from the claim text.