Door assembly for a temperature controlled storage structure
US5402841A · kind A · utility
Inventor
Key dates
| Filing date | Jun 7, 1993 |
| Grant date | Apr 4, 1995 |
| Priority date | — |
| Expiry date | Jun 7, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25D23/021
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An overhead door assembly is disclosed having a pair of rails each with upright and horizontal segments. Pivot supports at the lower ends of the upright segments permit the rails and a door thereon to move into and out of the doorway of a temperature controlled storage structure. A control shaft imparts movement to the rails by arm assemblies each including pivotally coupled arms to tilt the rail segments and door thereon between open and closed positions. The door is held in a closed position by an over-center relationship in each arm assembly. The control shaft is manually actuated while modified rail positioning arrangement includes a pneumatic cylinder and a valve control for rail positioning. Seals about the door and between panels of the door render the storage structure airtight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.