Power-assist door closer
US4995194A · kind A · utility
48Cited by
9References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1990 |
| Grant date | Feb 26, 1991 |
| Priority date | — |
| Expiry date | Mar 27, 2010 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/132
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An hydraulic door closer has a motor/pump component to assist opening the door by supplying oil under pressure to the closer cylinder. The component is activated by a switch sensitive to the turning of the closer pinion shaft as the door is moved out of its frame. Further, the distance which the door must move until the switch activates the motor/pump component is adjustable. The hydraulic circuitry is conveniently embodied in a single manifold block.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.