US3792677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure indicator for pneumatic tire wheels
Assignee: Individual
•
Filing: 1972-06-12
•
Granted: 1974-02-19
•
Expires: 1992-06-12
Abstract
Abstract A hollow chamber having an internal flexible diaphragm and carried by a pneumatic tire wheel in fluid communication with the pneumatic pressure thereof on one side of the diaphragm, a tubular stem extending shiftably into the chamber on the other side of the diaphragm and anchored to the latter for extension and retraction upon flexure of the diaphragm, a check valve in the stem, and resilient means urging the stem and diaphragm toward said one side of the latter against the pneumatic pressure of the tire wheel.
Inventors
- 👤 J Frost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:34
CPC Classifications
B; B60; B60C; B60C23/00; B60C23/02; B60C23/04; Y; Y10; Y10T; Y10T137/00; Y10T137/3584; Y10T137/3662
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
189 words
A pressure indicator for pneumatic tire wheels comprising a hollow casing for attachment to a wheel, a flexible diaphragm extending across the interior of said casing, said casing having an opening on one side of said diaphragm in fluid communication with the pneumatic pressure of a pneumatic tire wheel, a housing extending outwardly from said casing terminating in an outer end and in fluid communication with the interior of said casing on the other side of said diaphragm, a tubular stem shiftable in said housing having one end extending outwardly through and beyond the outer end of said housing for extension and retraction therethrough, the other end of said stem being anchored to and opening through said diaphragm for stem shifting upon diaphragm flexure, a one-way inlet valve in said stem for passing gas inwardly through said stem and diaphragm to said one diaphragm side and through said opening into a pneumatic tire wheel, and resilient means operatively interconnected between said casing and diaphragm for urging flexure of the latter to retract said stem against the pneumatic pressure of a pneumatic tire wheel and indicate a reduction in pressure.
Claim 2
Dependent Claim
189 words
A pressure indicator for pneumatic tire wheels comprising a hollow casing for attachment to a wheel, a flexible diaphragm extending across the interior of said casing, said casing having an opening on one side of said diaphragm in fluid communication with the pneumatic pressure of a pneumatic tire wheel, a housing extending outwardly from said casing terminating in an outer end and in fluid communication with the interior of said casing on the other side of said diaphragm, a tubular stem shiftable in said housing having one end extending outwardly through and beyond the outer end of said housing for extension and retraction therethrough, the other end of said stem being anchored to and opening through said diaphragm for stem shifting upon diaphragm flexure, a one-way inlet valve in said stem for passing gas inwardly through said stem and diaphragm to said one diaphragm side and through said opening into a pneumatic tire wheel, and resilient means operatively interconnected between said casing and diaphragm for urging flexure of the latter to retract said stem against the pneumatic pressure of a pneumatic tire wheel and indicate a reduction in pressure.
Claim 3
Dependent Claim
21 words
A pressure indicator according to claim 1, in combination with mounting means mounting said casing on the rim of a wheel.
Claim 4
Dependent Claim
31 words
A pressure indicator according to claim 2, said mounting means mounting said casing on the outer periphery of the wheel rim with said housing extending through the wheel rim internally thereof.
Claim 5
Dependent Claim
29 words
A pressure indicator according to claim 2, said mounting means mounting said chamber on the internal side of the wheel rim and said opening communicating through the wheel rim.
Claim 6
Dependent Claim
20 words
A pressure indicator according to claim 1, in combination with mounting means mounting said chamber on the wheel valve stem.
Claim 7
Dependent Claim
25 words
A pressure indicator according to claim 1, said diaphragm being flexible into facing engagement with opposite internal sides of said casing to limit diaphragm stress.
Claim 8
Dependent Claim
50 words
A pressure indicator according to claim 1, in combination with indicia means on said stem for exposure beyond said housing outer end to indicate safe minimum pneumatic pressure, said indicia means comprising a pair of equi-width marks, so that unequal width of marks exposed by said housing indicates insufficient pressure.
Claim 9
Dependent Claim
19 words
A pressure indicator according to claim 1, said resilient means comprising a coil compression spring circumposed about said stem.
References Cited (Backward Citations)
US1481654A
Cited
US3075538A
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US3129689A
Cited
US3129690A
Cited
US3610269A
Cited
US3670688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |