Door closer
US7003847B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 10, 2002 |
| Grant date | Feb 28, 2006 |
| Priority date | — |
| Expiry date | Jan 1, 2023 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/132
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A door closer comprising a housing, a member for driving engagement with a door, the member being rotatable relative to the housing in a door opening direction and in a door closing direction, a spring apparatus within the housing providing a resilient bias, the resilient bias being increased by rotation of the member in the door opening direction and a check device for controlling rotation of the member in the door closing direction and hence closure of the door under the action of the spring apparatus, the door closer having a back check comprising a piston member movable in a cylinder from an initial position against resistance of a fluid medium by rotation of the rotatable member in the opening direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.