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US3884500A
Expired / Lapsed
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Pressure sensing means and method of a pressurized container means and system utilizing the same
Assignee: Robertshaw Controls Co
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Filing: 1974-04-17
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Granted: 1975-05-20
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Expires: 1994-04-17
Abstract
Abstract A container having a pressurized fluid therein and a pressure sensing fluid operated device carried by the container for sensing pressure changes within the container. The sensing device is initially charged to same pressure level as the container and is disposed within the container so as to be substantially surrounded by the fluid therein and is thereby temperature compensated whereby pressure changes of the fluid in the container caused by temperature changes thereof are ineffective to cause sensing thereof by the sensing device as the fluid of the sensing device is at the same temperature as the fluid in the container. Such container can be utilized as the fluid pressure supply means for a vehicular air bag safety device.
Inventors
- 👤 Joseph P Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:10
CPC Classifications
B; B60; B60R; B60R21/00; B60R21/02; B60R21/16; B60R21/26; B60R21/268; G; G01; G01L; G01L7/00; G01L7/02; G01L7/04; G01L7/041
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
187 words
In combination, a vehicular air-bag safety means adapted to be inflated upon the detection of vehicular impact, a container means having a pressurized fluid therein for inflating said airbag safety means when fluidly interconnected thereto, fluid operated sensing means carried by said container means for sensing pressure changes within said container means, and detection means operatively associated with said sensing means to indicate when said sensing means is sensing a loss or a gain of pressure in said container means beyond desired limits thereof, said sensing means and said container means being so constructed and arranged that said sensing means is temperature compensated by being substantially surrounded by a reference pressure of said fluid of said container means so that pressure changes of said fluid in said container means caused by temperature changes thereof are ineffective to cause sensing thereof by said sensing means as said fluid of said sensing means is at the same temperature as said fluid in said container means, said fluid operated sensing means and said container means having been initially charged with their respective pressurized fluids to substantially the same pressure levels.
Claim 2
Dependent Claim
187 words
In combination, a vehicular air-bag safety means adapted to be inflated upon the detection of vehicular impact, a container means having a pressurized fluid therein for inflating said airbag safety means when fluidly interconnected thereto, fluid operated sensing means carried by said container means for sensing pressure changes within said container means, and detection means operatively associated with said sensing means to indicate when said sensing means is sensing a loss or a gain of pressure in said container means beyond desired limits thereof, said sensing means and said container means being so constructed and arranged that said sensing means is temperature compensated by being substantially surrounded by a reference pressure of said fluid of said container means so that pressure changes of said fluid in said container means caused by temperature changes thereof are ineffective to cause sensing thereof by said sensing means as said fluid of said sensing means is at the same temperature as said fluid in said container means, said fluid operated sensing means and said container means having been initially charged with their respective pressurized fluids to substantially the same pressure levels.
Claim 3
Dependent Claim
19 words
A combination as set forth in claim 1 wherein said sensing means comprises a fluid operated bourdon tube means.
Claim 4
Dependent Claim
27 words
A combination as set forth in claim 1 wherein said fluid operated means has fluid therein of the same type as the fluid in said container means.
Claim 5
Dependent Claim
60 words
A combination as set forth in claim 1 wherein said fluid operated sensing means hAs a movable wall that moves in accordance with changes in the pressure differential across the same, said wall having said fluid of said fluid operated means acting on one side thereof and said reference fluid of said container means acting on the other side thereof.
Claim 6
Dependent Claim
58 words
A combination as set forth in claim 4 wherein said detection means comprises an electrical switch, said movable wall of said fluid operated sensing means being adapted to operate said electrical switch in response to certain movement thereof whereby said operated switch signals a loss or a gain of pressure in said container means beyond desired limits thereof.
Claim 7
Dependent Claim
39 words
A combination as set forth in claim 5 wherein said sensing means has said movable wall located inside said container means whereby said reference pressure fluid is the fluid inside said container means acting on said other side thereof.
Claim 8
Dependent Claim
48 words
A combination as set forth in claim 6 wherein said fluid operated sensing means comprises a twisted bourdon tube having a free end that comprises said movable wall and which will rotate about the longitudinal axis of said tube upon changes in the pressure differential across the same.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |