Door closer
AssigneeDorma GmbH + Co. KG
InventorsThomas Salutzki, Volker Bienek, Thomas Wildförster, Thomas Pabst, Sabine Wiemann
Life of this patent
Estimating the term…
Abstract
A door closer, in particular a hinge door closer, including a locking function or free-swing function, having a door closer housing, an output shaft to be connected to a door, a piston assembly connected to the output shaft and guided in the door closer housing, a closer spring, a piston rod adapted to connect the piston assembly to the closer spring, a hydraulic lock compartment adapted to lock the closer spring, and in particular a free-swing assembly which is adapted to enable a translational motion of the piston assembly decoupled from the closer spring when the closer spring is locked.
Claims6
A door closer, including at least one of a locking function and a free-swing function, comprising:
- a door closer housing;
- an output shaft configured to be connected to a door;
- a piston assembly connected to the output shaft and guided in the door closer housing;
- a closer spring;
- a fluid-tight separating wall arranged in the door closer housing between the piston assembly and the closer spring;
- a piston rod that couples the piston assembly to the closer spring, wherein the piston rod passes through the separating wall in a fluid-tight manner
- a hydraulic lock compartment configured to lock the closer spring;
- and
- a free-swing assembly configured to enable a translational motion of the piston assembly decoupled from the closer spring when the closer spring is locked;
- a closer spring tension piston guided in the door closer housing and abutting on the closer spring;
- wherein the lock compartment is arranged between the separating wall and the closer spring tension piston.
A door closer configured as a hinge door closer, including at least one of a locking function and a free-swing function, comprising:
- a door closer housing;
- an output shaft configured to be connected to a door;
- a piston assembly connected to the output shaft and guided in the door closer housing;
- a closer spring;
- a fluid-tight separating wall arranged in the door closer housing between the piston assembly and the closer spring;
- a piston rod that couples the piston assembly to the closer spring, wherein the piston rod passes through the separating wall in a fluid-tight manner
- a hydraulic lock compartment configured to lock the closer spring;
- a free-swing assembly configured to enable a translational motion of the piston assembly decoupled from the closer spring when the closer spring is locked;
- a closer spring tension piston guided in the door closer housing and abutting on the closer spring;
- wherein the lock compartment is arranged between the separating wall and the closer spring tension piston;
- and
- a hydraulic solenoid control valve having a valve housing;
- a valve chamber integrated into the valve housing including:
- a first valve seat bore as a connection to a first pressure line;
- a second valve seat bore as a connection to a second line configured as an operating line;
- and
- a free aperture configured as a connection to a third line configured as a tank line;
- a solenoid;
- and
- a valve spindle moved by said solenoid and partially arranged in the valve chamber, the valve spindle comprises, within the valve chamber, a first sealing surface facing the first valve seat bore and a second sealing surface facing the second valve seat bore, such that the first valve seat bore or the second valve seat bore can be selectively closed,
- wherein the valve spindle extends from the valve chamber through the second valve seat bore toward the solenoid, and
- when the second valve seat bore is closed, the valve spindle is pulled into the second valve seat bore by a differential-area-ratio by a pressure in the operating line,
- wherein the valve adapter is formed in the door closer.
Dependencies are inferred from the claim text.