Pressure-controlling apparatus employed in pre-chamber of enviro

Details Pressure-controlling apparatus employed in pre-chamber of enviro Pressure-controlling apparatus employed in pre-chamber of enviro

1987-03-09

1989-07-11

Lall, Parshotam S.

Boots, shoes, and leggings

364550, 364558, 36442403, 738656, G01M 1700, G06F 1520

Patent

active

048477907

ABSTRACT:
In a pressure-controlling apparatus employed in a pre-chamber of an environmental testing chamber for a self-propelled vehicle, in which testing chamber various tests are conducted under a subatmospheric pressure, which testing chamber is provided with the pre-chamber for permitting an opertor's getting in/out of the testing chamber, the improvement resides in that: operational switch means provided in the pre-chamber permit the operator to open/close a first and a second opening/closing valves, which first opening/closing valve is provided in a first air-duct which opens into open air at one end and into said pre-chamber at the other end for recovering an air-pressure of the pre-chamber, which second opening/closing valve is provided in a second air-duct which opens into the testing chamber at one end and into the pre-chamber at the other end for reducing the air-pressure of the pre-chamber.

REFERENCES:
patent: 3878376 (1975-04-01), Sholes, Jr. et al.
patent: 4313726 (1982-02-01), Chase

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