Patent · US Active

Door closer

US8875344B2 · kind B2 · utility

25Cited by

23References

6Claims

0Family size

Assignee

Dorma GmbH + Co. KG · DE

Inventors

Thomas Salutzki · Ennepetal, DE
Volker Bienek · Dortmund, DE
Thomas Wildförster · Schwelm, DE
Thomas Pabst · Leonberg, DE
Sabine Wiemann · Ennepetal, DE

Key dates

Filing date	Nov 30, 2010
Grant date	Nov 4, 2014
Priority date	—
Expiry date	Dec 1, 2030

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T137/87917
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.