Patent US4847790A successfully refreshed from Google Patents.
US4847790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-controlling apparatus employed in pre-chamber of environmental testing chamber for self-propelled vehicle
Assignee: Toyo Seisakusho KK
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Filing: 1987-03-09
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Granted: 1989-07-11
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Expires: 2007-03-09
Abstract
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.
Inventors
- 👤 Nobuo Suzuki
- 👤 Ikuhide Ota
- 👤 Masanobu Ishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:18
CPC Classifications
G; G01; G01M; G01M9/00; G01M9/02; G01M9/04; G01M17/00; G01M17/007
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
148 words
A pressure-control apparatus for environmental testing of a vehicle within a testing chamber, said testing chamber having its interior maintained at a predetermined sub-atmospheric pressure, and having at its entrance a pre-chamber through which an operator enters and leaves said testing chamber, said apparatus comprising: first means for selectively communicating said pre-chamber with a source of sub-atmospheric pressure; second means for selectively communicating said chamber with a source of atmospheric pressure; control means coupled to the first and second means for selectively opening and closing communication through said first and second means, and including pressure-changing means for gradually and controllably varying the pressure in the chamber by repeatedly cycling one of the first and second means in a plurality of open-and-closed cycles, with each such cycle generating a pressure change substantially less than a pressure differential between atmospheric pressure and the predetermined sub-atmospheric pressure in the testing chamber.
Claim 2
Dependent Claim
148 words
A pressure-control apparatus for environmental testing of a vehicle within a testing chamber, said testing chamber having its interior maintained at a predetermined sub-atmospheric pressure, and having at its entrance a pre-chamber through which an operator enters and leaves said testing chamber, said apparatus comprising: first means for selectively communicating said pre-chamber with a source of sub-atmospheric pressure; second means for selectively communicating said chamber with a source of atmospheric pressure; control means coupled to the first and second means for selectively opening and closing communication through said first and second means, and including pressure-changing means for gradually and controllably varying the pressure in the chamber by repeatedly cycling one of the first and second means in a plurality of open-and-closed cycles, with each such cycle generating a pressure change substantially less than a pressure differential between atmospheric pressure and the predetermined sub-atmospheric pressure in the testing chamber.
Claim 3
Dependent Claim
19 words
The pressure-control apparatus of claim 1, wherein said source of atmospheric pressure is the open exterior of said pre-chamber.
Claim 4
Dependent Claim
19 words
The pressure-control apparatus of claim 1, wherein said source of sub-atmospheric pressure is the interior of the testing chamber.
Claim 5
Dependent Claim
29 words
The pressure-control apparatus of claim 1, further comprising an indicator means coupled to the control means for providing a signal when pressure in the pre-chamber reaches a desired level.
Claim 6
Dependent Claim
14 words
The pressure control apparatus of claim 1, wherein said first means is a valve.
Claim 7
Dependent Claim
14 words
The pressure control apparatus of claim 1, wherein said second means is a valve.
Claim 8
Dependent Claim
21 words
The pressure-control apparatus of claim 1, wherein the pressure-changing means comprises a pressure-reducing means for controlling operation of the first means.
Claim 9
Dependent Claim
23 words
The pressure-control apparatus of claim 7, wherein the pressure changing means further comprises a pressure-raising means for controlling operation of the second means.
Claim 10
Dependent Claim
20 words
The pressure-control apparatus of claim 8, wherein the pressure-reducing means comprises one pre-chamber and the pressure-raising means comprises another pre-chamber.
Claim 11
Dependent Claim
26 words
The pressure-control apparatus of claim 1, wherein said pressure changing means includes a switch means for initiating said repeated cycling when manually actuated by the operator.
Claim 12
Dependent Claim
14 words
The pressure-control apparatus of claim 10, wherein said switch means is inside said pre-chamber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |