Damper and method of controlling a door
US5291630A · kind A · utility
27Cited by
2References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1992 |
| Grant date | Mar 8, 1994 |
| Priority date | — |
| Expiry date | Nov 19, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/132
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A door closer comprises a housing containing a cylinder and two movable pistons. When the associated door is opened, both of the pistons and the cylinder are moved relative to the housing to draw oil into the cylinder. Expulsion of oil from the cylinder through an orifice on closing of the door controls the closing movement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.