Patent · US Active

Door closer comprising device for preventing a spring-back

US8806715B2 · kind B2 · utility

8Cited by

12References

11Claims

0Family size

Assignee

Dorma GmbH + Co. KG · DE

Inventors

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

Key dates

Filing date	Nov 30, 2010
Grant date	Aug 19, 2014
Priority date	—
Expiry date	Apr 11, 2031

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 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.

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