Patent ID: 8875344
Filing Date: 2014-11-04
Classification: E05F,E05Y,F16K,Y10T

Abstract:
1. 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.