Door control device
US4937914A · kind A · utility
8Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1989 |
| Grant date | Jul 3, 1990 |
| Priority date | — |
| Expiry date | Mar 30, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/132
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The piston of a door control device is assembled from a channel and cups welded on to opposite ends of the channel. A valve assembly is mounted in one of the cups. Rollers extend between opposite sides of the channel and co-operate with teeth on a rotatable member to which a control arm is secured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.