Door control device having piston assembly with separately formed rack
US4502180A · kind A · utility
14Cited by
5References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1982 |
| Grant date | Mar 5, 1985 |
| Priority date | — |
| Expiry date | Nov 26, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S16/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The piston assembly of a hydraulically controlled door closer has a tubular wall, plugs secured in end portions of the wall and a separate rack secured inside the tubular wall between the plugs by formations on the plugs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.