US4883107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air inlet and automatic pressure adjustment device for a tire
Assignee: Calibrated Tire Valves Inc
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Filing: 1987-12-04
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Granted: 1989-11-28
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Expires: 2007-12-04
Abstract
Abstract A dual valve assembly with calibrated or adjustable spring loading that may be attached to a valve stem on a tire to allow slightly over pressuring the tire with air and which then automatically adjusts the pressure in the tire to match a spring loading calibration.
Inventors
- 👤 Kenneth B. Keys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:15
CPC Classifications
B; B60; B60C; B60C29/00; B60C29/06; B60C29/068
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
146 words
An assembly to allow air filling and automatic pressure adjustment of a tire comprising: (a) a housing means with an externally threaded upper end (b) an adjustable loading spring contained in said housing means (c) a secondary valve held down by said adjustable loading spring (d) a primary valve with a stem extending through the top of said housing means and through said secondary valve (e) a seat in said secondary valve to seat said primary valve (f) a return spring around said stem of said primary valve that urges said primary valve to seat in said secondary valve, and (g) wherein said housing means is a cap containing an internal collar threaded externally under said secondary valve with said collar containing a depessor spring to open a valve core valve in a valve stem and further serving the purpose of adjusting said adjustable loading spring.
Claim 2
Dependent Claim
146 words
An assembly to allow air filling and automatic pressure adjustment of a tire comprising: (a) a housing means with an externally threaded upper end (b) an adjustable loading spring contained in said housing means (c) a secondary valve held down by said adjustable loading spring (d) a primary valve with a stem extending through the top of said housing means and through said secondary valve (e) a seat in said secondary valve to seat said primary valve (f) a return spring around said stem of said primary valve that urges said primary valve to seat in said secondary valve, and (g) wherein said housing means is a cap containing an internal collar threaded externally under said secondary valve with said collar containing a depessor spring to open a valve core valve in a valve stem and further serving the purpose of adjusting said adjustable loading spring.
Claim 3
Dependent Claim
46 words
An assembly to allow air filling and automatic pressure adjustment in a tire as in claim 1 where said cap further has a threaded second cap that may be used to adjust said adjustable loading spring while said cap is threaded on to said valve stem.
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) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |