Processing cabinet with sub-door access
US4624512A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 10, 1985 |
| Grant date | Nov 25, 1986 |
| Priority date | — |
| Expiry date | Jun 10, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF26B25/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The main door of a freeze dryer is provided with a sub-opening arranged to register with the space between adjacent vertically adjustable freeze dryer shelves, for infeeding and outfeeding trays or other containers of material to and from each shelf. An entry chamber surrounds the sub-opening and has a sloping outer face provided with a resilient seal arranged to form a pressure tight seal with a sub-door movable by a fluid pressure piston-cylinder unit between positions opening and closing the entry passageway of the entry chamber. Photoelectric safety mechanism is associated with the entry passageway to prevent closing of the sub-door when any object is in the entry passageway.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.