Air lock door control apparatus
US4375735A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 15, 1981 |
| Grant date | Mar 8, 1983 |
| Priority date | — |
| Expiry date | Apr 15, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE05C7/002
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An air lock has a chamber and a pair of doors in respective walls of the chamber. Operators associated with the doors include closers normally biasing the doors to closed positions and fluid powered openers associated with the closers capable of overriding the bias of the closers. A control system, operation of which may be initiated by initial opening displacement of one of the doors or (in one embodiment of the invention) by manually operable remote switch means, provides for opening of one of the doors and latching of the other to prevent simultaneous opening of both doors. The latch means for the doors may be overriden by direct displacement of the doors for safety purposes. The control system also triggers air handling apparatus associated with the chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.