US3818764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensing means and method for a pressurized container means and system utilizing the same
Assignee: Robertshaw Controls Co
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Filing: 1973-01-08
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Granted: 1974-06-25
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Expires: 1993-01-08
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
- 👤 J Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:03
CPC Classifications
G; G01; G01L; G01L7/00; G01L7/02; G01L7/04; G01L7/041
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
164 words
In combination, a container means having a pressurized fluid therein, and fluid operated sensing means carried by said container means for sensing pressure changes within said container means, 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 uneffective to cause sensing thereof by said sensing means as the 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, said fluid operated sensing means having means for charging the same with its respective fluid externally of said container means while said fluid operated sensing means is being carried by said container means.
Claim 2
Dependent Claim
164 words
In combination, a container means having a pressurized fluid therein, and fluid operated sensing means carried by said container means for sensing pressure changes within said container means, 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 uneffective to cause sensing thereof by said sensing means as the 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, said fluid operated sensing means having means for charging the same with its respective fluid externally of said container means while said fluid operated sensing means is being carried by said container means.
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
44 words
A combination as set forth in claim 3 wherein said means for charging said fluid operated sensing means is also adapted to simultaneously charge said container means with its respective fluid when said fluid operated sensing means is being charged with its respective fluid.
Claim 6
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 7
Dependent Claim
51 words
A combination as set forth in claim 5 wherein said movable wall of said fluid operated sensing means is adapted to operate an 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 8
Dependent Claim
39 words
A combination as set forth in claim 6 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 9
Dependent Claim
48 words
A combination as set forth in claim 7 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.
Claim 10
Independent Claim
170 words
A method for sensing the pressure changes in a container means having a pressurized fluid therein comprising the steps of sensing pressure changes within said container means with a fluid operated sensing means carried by said container means, temperature compensating said sensing means by substantially surrounding said sensing means 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, and initially charging said fluid operated sensing means and said container means with their respective pressurized fluids to substantially the same pressure levels, said step of charging said sensing means comprising the step of charging said sensing means through charging means of said sensing means that is located externally of said container means and while said sensing means is being carried by said container means.
Claim 11
Independent Claim
170 words
A method for sensing the pressure changes in a container means having a pressurized fluid therein comprising the steps of sensing pressure changes within said container means with a fluid operated sensing means carried by said container means, temperature compensating said sensing means by substantially surrounding said sensing means 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, and initially charging said fluid operated sensing means and said container means with their respective pressurized fluids to substantially the same pressure levels, said step of charging said sensing means comprising the step of charging said sensing means through charging means of said sensing means that is located externally of said container means and while said sensing means is being carried by said container means.
Claim 12
Dependent Claim
32 words
A method as set forth in claim 9 and including the step of charging said fluid operated sensing means with fluid of the same type as the fluid in said container means.
Claim 13
Dependent Claim
43 words
A method as set forth in claim 10 and including the step of charging said container means with its respective fluid through said charging means of said sensing means at the same time said sensing means is being charged with its respective fluid.
Claim 14
Dependent Claim
60 words
A method as set forth in claim 9 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 15
Dependent Claim
54 words
A method as set forth in claim 12 and including the step of causing said movable wall of said fluid operated sensing means to operate an 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 16
Dependent Claim
43 words
A method as set forth in claim 13 and including the step of locating said movable wall of said sensing means inside said container means whereby said reference pressure fluid is the fluid inside said container means acting on said other side thereof.
Claim 17
Dependent Claim
53 words
A method as set forth in claim 14 and including the step of forming said fluid operated sensing means from 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.
Claim 18
Dependent Claim
25 words
A method as set forth in claim 9 wherein said container means comprises the fluid pressure supply means for inflating a vehicular air-bag safety means.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |