Hydraulic door closer construction
US4394787A · kind A · utility
15Cited by
14References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 27, 1978 |
| Grant date | Jul 26, 1983 |
| Priority date | — |
| Expiry date | Jul 27, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/132
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hydraulic door closer is provided with a fluid seal for its output shaft, the seal comprising multiple O-rings disposed side-by-side in an elongated annular chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.