Drying and gas or vapor contact with solids – Apparatus – Vacuum
Patent
1989-11-22
1991-02-19
Yuen, Henry C.
Drying and gas or vapor contact with solids
Apparatus
Vacuum
432205, 34 95, 34 138, F26B 1330
Patent
active
049931717
ABSTRACT:
The present invention provides a covering for a hydraulic ram of a freeze dryer. The freeze dryer of the present invention includes a pressure vessel having a sterile freeze drying chamber for receiving a stack of containers holding a sterile material to be freeze dried. A pressure plate located within the freeze drying chamber is adapted to be driven against the stack of containers for mechanically stoppering the containers. A hydraulic ram is connected to the pressure vessel and has an actuating arm projecting into the freeze drying chamber. The actuating arm is connected to the pressure plate and is extendible for driving the pressure plate against the containers and retractable for removal of the containers from the pressure vessel. The actuating arm has a non-sterile surface that could contaminate the freeze drying chamber and therefore, the sterile material could be freeze dried. In accordance with the present invention, an elongated covering, preferably in the form of a welded steel bellows, sealably connected at one end, to the pressure vessel and, at the other end, to the pressure plate isolates the non-sterile surface of the actuating arm to prevent contamination of the sterile material to be freeze dried.
REFERENCES:
patent: 1328658 (1920-01-01), Fish, Jr.
patent: 3971875 (1976-07-01), Regalbuto
patent: 3986268 (1976-10-01), Koppelman
patent: 4102637 (1978-07-01), Kneider et al.
patent: 4233752 (1980-11-01), Kleinguenther
patent: 4802654 (1989-02-01), Bozhko et al.
Pearlman Robert I.
Rosenblum David M.
The BOC Group Inc.
Yuen Henry C.
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