US3811459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure indicating valve
Assignee: FIETZ E
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Filing: 1972-07-13
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Granted: 1974-05-21
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Expires: 1992-07-13
Abstract
Abstract A composite tubular structure defines an internal cavity and consists of a tubular valve holder and a cylinder, which is fixed in said valve holder and formed with external screw threads disposed axially outwardly of said valve holder. A diaphragm is air-tightly fixed in said composite tubular structure and axially divides said cavity into an outer compartment and an inner compartment. A plunger is connected to said diaphragm and axially slidably mounted in said cylinder and formed with a central axial bore, which comprises an axially inwardly facing shoulder and which communicates through said diaphragm with said inner compartment. Said plunger has an outer portion protruding axially outwardly from said cylinder. An axially outwardly facing, tubular spring abutment is connected to said diaphragm and disposed in said bore and axially inwardly spaced from said shoulder. A valve member extends in said bore and comprises a sealing cone disposed between said shoulder and said abutment and tapering toward and adapted to sealingly engage said bore at said shoulder. A helical compression spring is held between said valve member and said abutment and urges said sealing cone toward said shoulder. An indicating cap has internal screw threads in threaded engagement with said external screw threads of said cylinder. Said cap is disposed axially outwardly of said valve holder and has an axial through bore which is larger in diameter than said outer portion of said plunger.
Inventors
- 👤 H Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:34
CPC Classifications
B; B60; B60C; B60C23/00; B60C23/02; B60C23/04; B60C23/0491; B60C23/0496; F; F16; F16K; F16K15/00; F16K15/20; F16K15/207; F16K27/00; F16K27/08; Y; Y10; Y10T; Y10T137/00; Y10T137/3584; Y10T137/3662
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
325 words
A pressure-indicating valve, which comprises a tubular sleeve, a cylinder insert fixed in said sleeve, said sleeve and said cylinder insert forming a composite tubular structure defining an internal cavity, said tubular structure having external screw threads disposed axially outwardly thereon, a diaphragm air-tightly fixed in said composite tubular structure and axially dividing said cavity into an outer compartment and an inner compartment, a valve body connected to said diaphragm and axially slidably mounted in said cylinder and formed with a central axial bore, said valve body having an axially inwardly faCing shoulder, said valve body having an outer portion protruding axially outwardly from said tubular structure, a dust cap removably mounted on said outer portion of the valve body to seal said bore, an axially outwardly facing, tubular spring abutment, which is connected to said diaphragm and disposed in said bore and axially inwardly spaced from said shoulder, a valve member extending in said bore and including a sealing cone disposed between said shoulder and said abutment and tapering toward and adapted to sealingly engage said bore toward said shoulder, whereby air under pressure can be added to said inner compartment through said bore, an indicating screw cap having internal screw threads in treaded engagement with said external screw threads of said tubular structure, said cap being disposed axially outwardly of said tubular structure and having an axial through bore which is larger in diameter than said outer portion of said dust cap, said diaphragm being responsive to changes in air pressure differentials between said inner compartment and said outer compartment, said indicating screw cap being adjustable to permit the top outside surface of the indicating screw cap to be flush with the top outside surface of the dust cap, said dust cap defining a recess with respect to said indicating screw cap as the diaphragm responds to a change in said air pressure differential on reduction of air pressure within said inner compartment.
Claim 2
Dependent Claim
325 words
A pressure-indicating valve, which comprises a tubular sleeve, a cylinder insert fixed in said sleeve, said sleeve and said cylinder insert forming a composite tubular structure defining an internal cavity, said tubular structure having external screw threads disposed axially outwardly thereon, a diaphragm air-tightly fixed in said composite tubular structure and axially dividing said cavity into an outer compartment and an inner compartment, a valve body connected to said diaphragm and axially slidably mounted in said cylinder and formed with a central axial bore, said valve body having an axially inwardly faCing shoulder, said valve body having an outer portion protruding axially outwardly from said tubular structure, a dust cap removably mounted on said outer portion of the valve body to seal said bore, an axially outwardly facing, tubular spring abutment, which is connected to said diaphragm and disposed in said bore and axially inwardly spaced from said shoulder, a valve member extending in said bore and including a sealing cone disposed between said shoulder and said abutment and tapering toward and adapted to sealingly engage said bore toward said shoulder, whereby air under pressure can be added to said inner compartment through said bore, an indicating screw cap having internal screw threads in treaded engagement with said external screw threads of said tubular structure, said cap being disposed axially outwardly of said tubular structure and having an axial through bore which is larger in diameter than said outer portion of said dust cap, said diaphragm being responsive to changes in air pressure differentials between said inner compartment and said outer compartment, said indicating screw cap being adjustable to permit the top outside surface of the indicating screw cap to be flush with the top outside surface of the dust cap, said dust cap defining a recess with respect to said indicating screw cap as the diaphragm responds to a change in said air pressure differential on reduction of air pressure within said inner compartment.
Claim 3
Dependent Claim
19 words
A pressure-indicating valve as set forth in claim 1, in which said cylinder insert is screw-threaded into said sleeve.
Claim 4
Dependent Claim
33 words
A pressure-indicating valve as set forth in claim 1, in which said sleeve is provided at its axially inner end with a rubber sleeve for connecting said valve holder to a tubeless tire.
Claim 5
Dependent Claim
32 words
A pressure-indicating valve as set forth in claim 1, in which said sleeve is provided at its axially inner end with a flange for connecting said valve holder to an air tube.
Claim 6
Dependent Claim
20 words
A pressure-indicating valve as set forth in claim 1, in which said diaphragm is tightly connected to said valve body.
Claim 7
Dependent Claim
27 words
A pressure-indicating valve as set forth in claim 1, in which said diaphragm is provided with an axially outwardly extending, central tubular extension forming said spring abutment.
Claim 8
Dependent Claim
23 words
A pressure-indicating valve as set forth in claim 1, which comprises springs means urging said valve body axially inwardly relative to said cylinder.
Claim 9
Dependent Claim
30 words
A pressure indicating valve as set forth in claim 1, wherein said recess is defined in response to a pressure reduction of about 10 per cent within said inner compartment.
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |