Door closer comprising device for preventing a spring-back
AssigneeDorma GmbH + Co. KG
InventorsVolker Bienek, Sabine Wiemann, Thomas Pabst
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 a spring-loaded check valve arranged between the lock compartment and a space becoming smaller during the opening process of the door, in particular an accommodating space for the closer spring. The spring-loaded check valve locks toward the space becoming smaller.
Claims11
A door closer having 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 piston rod that connects the piston assembly to the closer spring;
- a hydraulic lock compartment adapted to lock the closer spring;
- an sliding-coupling accommodating space for the closer spring that becomes smaller during an opening process of the door;
- a spring-loaded check valve that locks toward the accommodating space becoming smaller and arranged between the hydraulic lock compartment and the accommodating space;
- a closer spring tension piston guided in the door closer housing and abutting on the closer spring;
- wherein the spring-loaded check valve is arranged such that hydraulic oil in the accommodating space is pre-pressurized by an opening process and is actively pumped through the spring-loaded check valve into the hydraulic lock compartment.
Dependencies are inferred from the claim text.