Door control device
US5487206A · kind A · utility
7Cited by
13References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1994 |
| Grant date | Jan 30, 1996 |
| Priority date | — |
| Expiry date | Jan 16, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05Y2900/132
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A door closing device comprises a piston (12) having at one end a seal (21) which seals the interface between the piston and a housing (10). The seal (21) also acts as a one-way valve and carries a pressure relief valve (37).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.