Patent US3800736A successfully refreshed from Google Patents.
US3800736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure change indicator
Assignee: Eaton Corp
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Filing: 1973-03-12
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Granted: 1974-04-02
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Expires: 1993-03-12
Abstract
Abstract A device for indicating variations from a predetermined pressure in a pressurized container such as a pneumatic tire. The device includes a first chamber exposed to pressure within the monitored container and a second chamber, or reference chamber, which is selectively pressurized to a predetermined reference pressure. A mechanism sensitive to a predetermined pressure differential between the two chambers will simultaneously indicate the pressure change and will place the two chambers in fluid communication. Upon equalization of pressure between the two chambers, the mechanism may be returned to a position whereat it will cease to indicate and will block fluid communication between the two chambers.
Inventors
- 👤 H Krohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:52
CPC Classifications
G; G01; G01L; G01L19/00; G01L19/08; G01L19/12; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86485
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
120 words
A device for indicating variations from reference pressure in a monitored pressurized container, said device comprising: a housing defining a first and a second chamber, said first chamber in fluid communication with the interior of said container; and means mounted to said housing responsive to a predetermined absolute pressure differential between said first and second chamber, said means in a first position corresponding to less than the predetermined pressure differential between the two chambers blocking fluid communication between tHe two chambers and in a second position corresponding to at least the predetermined pressure differential between the two chambers establishing fluid communication between the two chambers and indicating the existence of a variation from reference pressure in the monitored pressurized container.
Claim 2
Independent Claim
120 words
A device for indicating variations from reference pressure in a monitored pressurized container, said device comprising: a housing defining a first and a second chamber, said first chamber in fluid communication with the interior of said container; and means mounted to said housing responsive to a predetermined absolute pressure differential between said first and second chamber, said means in a first position corresponding to less than the predetermined pressure differential between the two chambers blocking fluid communication between tHe two chambers and in a second position corresponding to at least the predetermined pressure differential between the two chambers establishing fluid communication between the two chambers and indicating the existence of a variation from reference pressure in the monitored pressurized container.
Claim 3
Dependent Claim
46 words
The device of claim 1 wherein the housing is adapted to be sealingly mounted through an aperture in the monitored container, a portion of said means extending from said housing exterior of said container in said second position to indicate the existence of a pressure variation.
Claim 4
Dependent Claim
116 words
The device of claim 2 wherein said means responsive to a predetermined absolute pressure differential between the two chambers comprises: a rod member slidably and sealingly engaged in said housing, said rod member in the first position sealing a fluid passage between the first and second chambers and in the second position partially extending from the housing and unsealing the fluid passage between the chambers; means biasing said rod member to the second position; means normally locking the rod in the first position; a diaphragm interposed the first and second chambers, said diaphragm effective upon deflection corresponding to the said predetermined pressure differential to move said locking means out of locking engagement with said rod member.
Claim 5
Dependent Claim
58 words
The device of claim 3 wherein the rod member is exposed at one end to the interior of the pressured container and at the other end to the exterior of the pressurized container, the means biasing said rod to the second position being the pressure within the pressurized container acting on said one end of the rod member.
Claim 6
Dependent Claim
18 words
The device of claim 3 wherein said means biasing said rod to the second position comprises a spring.
Claim 7
Dependent Claim
25 words
The device of claim 3 wherein said locking means will lockingly reengage the rod member when said rod member is returned to said first position.
Claim 8
Dependent Claim
50 words
The device of claim 6 wherein said second chamber is pressurized to the reference pressure by pressurizing the monitored container to the reference pressure and then placing said rod member in the first position, fluidly isolating said second chamber in a condition whereat it is pressurized to the reference pressure.
Claim 9
Dependent Claim
46 words
The device of claim 7 wherein said housing is mounted in the aperture of said container such that both the first and second chambers are interior of said container to minimize the sensitivity of the device to pressure variations within said container caused by temperature variations.
Claim 10
Dependent Claim
46 words
The device of claim 7 wherein said housing is mounted in the aperture of said container with the first chamber substantially interior and the second chamber substantially exterior of said container to render said device sensitive to pressure variations within said container caused by temperature variation.
Claim 11
Independent Claim
338 words
A device for indicating a predetermined, absolute variation from a selectively variable reference pressure in a monitored pressurized container, said device comprising: a housing adapted to be sealingly mounted in an aperture in the container, said housing defining a first and a second chamber, said first chamber being in fluid communication with the interior of the container, said housing additionally defining an elongated bore opening to the portion of the housing exterior of the container and a fluid passage between said first and second chambers, said bore and passage being spaced and substantially concentric; an elongated rod member having an upper portion slidably and sealingly engaged in said bore, a valve portion for selective sealing of said passage and a flanged portion interposed the upper and valve portions, said rod member having first position corresponding to less than the predetermined absolute pressure variation and a second position corresponding to at least the predetermined absolute pressure variation, in said first position said upper portion being substantially interior of said bore and said sealing portion being in seAling engagement with said passage and in said second position, said upper portion extending from said housing to indicate a pressure variation and said sealing portion disengaging said passage to allow fluid communication between said first and second chambers; a locking member pivotably mounted to said housing, said locking member having a flange portion engaging section and a lever arm section, said locking member biased to a position whereat said flanged portion of said rod member will be engaged when said rod is in said first position preventing said rod from moving to said second position; a diaphragm interposed said first and second chambers, said diaphragm carrying an actuating member which, upon diaphragm movement corresponding to the existence of the predetermined absolute pressure differential between the first and second chambers, will bear against the lever arm section of the locking member causing the locking member to pivotably disengage the flanged portion of the rod; and means biasing said rod to the second position.
Claim 12
Independent Claim
338 words
A device for indicating a predetermined, absolute variation from a selectively variable reference pressure in a monitored pressurized container, said device comprising: a housing adapted to be sealingly mounted in an aperture in the container, said housing defining a first and a second chamber, said first chamber being in fluid communication with the interior of the container, said housing additionally defining an elongated bore opening to the portion of the housing exterior of the container and a fluid passage between said first and second chambers, said bore and passage being spaced and substantially concentric; an elongated rod member having an upper portion slidably and sealingly engaged in said bore, a valve portion for selective sealing of said passage and a flanged portion interposed the upper and valve portions, said rod member having first position corresponding to less than the predetermined absolute pressure variation and a second position corresponding to at least the predetermined absolute pressure variation, in said first position said upper portion being substantially interior of said bore and said sealing portion being in seAling engagement with said passage and in said second position, said upper portion extending from said housing to indicate a pressure variation and said sealing portion disengaging said passage to allow fluid communication between said first and second chambers; a locking member pivotably mounted to said housing, said locking member having a flange portion engaging section and a lever arm section, said locking member biased to a position whereat said flanged portion of said rod member will be engaged when said rod is in said first position preventing said rod from moving to said second position; a diaphragm interposed said first and second chambers, said diaphragm carrying an actuating member which, upon diaphragm movement corresponding to the existence of the predetermined absolute pressure differential between the first and second chambers, will bear against the lever arm section of the locking member causing the locking member to pivotably disengage the flanged portion of the rod; and means biasing said rod to the second position.
Claim 13
Dependent Claim
17 words
The device of claim 10 wherein said upper portion of said rod carries a highly visible coating.
Claim 14
Dependent Claim
24 words
The device of claim 10 additionally including an electronic device for sensing the extension of said upper portion of said rod from said housing.
Claim 15
Dependent Claim
12 words
The device of claim 10 wherein said biasing means is a spring.
Claim 16
Dependent Claim
42 words
The device of claim 10 when said valving portion is exposed to container pressure and said upper portion is exposed to atmosphere pressure when said rod is in the first position, said biasing means comprising container pressure acting upon the valving portion.
Claim 17
Dependent Claim
23 words
The device of claim 11 wherein said pressurized container is a pneumatic tire and said aperture is an aperture in the tire rim.
Claim 18
Dependent Claim
22 words
The device of claim 15 wherein said aperture is of the same size as the aperture provided for the snap-in tire valve.
Claim 19
Dependent Claim
37 words
The device of claim 10 wherein said bore carries at least one O-ring for sealingly engaging said upper rod portion and said valving portion carries at least one O-ring for sealing and sliding engagement in said passage.
Claim 20
Dependent Claim
44 words
The device of claim 15 wherein said second chamber is pressurized to reference pressure by inflating the tire to desired pressure and then pushing the upper portion of the rod member inwardly until it is engaged by the locking member in the first position.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |