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US3568708A
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US
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Tire valve core
Assignee: Schrader Automotive Inc
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Filing: 1969-07-15
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Granted: 1971-03-09
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Expires: 1989-07-15
Abstract
Abstract A tire valve core which has a two-piece plastic body wherein the parts interfit in snap engagement. Seal in tire stem is assured as the tapered plastic side of the body wedges against the stem shoulder.
Inventors
- 👤 Robert B Ashman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:34
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/20; Y; Y10; Y10T; Y10T137/00; Y10T137/3584; Y10T137/3786; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7939
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
209 words
A tire valve core comprising: a. a valve body of plastic having an axial passage therethrough and with a threaded portion in its outer wall to be screwed into a valve stem, the body presenting a downwardly facing seat surrounding the lower end of the passage; b. a spring retainer cup of plastic having an open upper end and central opening in its bottom wall, the body fitting snugly into the mouth of the retainer cup, the outer surface of the body engaging the inner surface of the cup, one of the surfaces being formed with a circumferential groove and the other with a circumferential rib interfitting in snap engagement in the groove to provide a tight swivel connection between the cup and the body; c. a valve pin extending down freely through said passage and into the cup and having a resilient valve flange bonded to the pin below the bottom of the body to serve as the valve element; and d. an axial spring disposed in compression in the cup with its upper end engaging under the flange and surrounding the pin to bias the valve element closed against the seat, the lower end of the spring engaging the bottom wall of the cup surrounding the Opening.
Claim 2
Dependent Claim
209 words
A tire valve core comprising: a. a valve body of plastic having an axial passage therethrough and with a threaded portion in its outer wall to be screwed into a valve stem, the body presenting a downwardly facing seat surrounding the lower end of the passage; b. a spring retainer cup of plastic having an open upper end and central opening in its bottom wall, the body fitting snugly into the mouth of the retainer cup, the outer surface of the body engaging the inner surface of the cup, one of the surfaces being formed with a circumferential groove and the other with a circumferential rib interfitting in snap engagement in the groove to provide a tight swivel connection between the cup and the body; c. a valve pin extending down freely through said passage and into the cup and having a resilient valve flange bonded to the pin below the bottom of the body to serve as the valve element; and d. an axial spring disposed in compression in the cup with its upper end engaging under the flange and surrounding the pin to bias the valve element closed against the seat, the lower end of the spring engaging the bottom wall of the cup surrounding the Opening.
Claim 3
Dependent Claim
46 words
A valve core as described in claim 1 wherein the lower end of the body is of reduced outer diameter where it is surrounded by the upper end of the cup and the external diameter of the body and cup where they meet are the same.
Claim 4
Dependent Claim
40 words
A valve core as described in claim 1 wherein the exterior of the core is formed with a circumferentially tapered portion which, in insertion into a valve housing, engages a shoulder in such housing, wedging thereagainst to form a seal.
Claim 5
Dependent Claim
20 words
A valve core as described in claim 1 wherein the lower end of the body is formed with rounded edges.
Claim 6
Dependent Claim
26 words
A valve core as described in claim 3 wherein the tapered bushing is formed with a series of spaced annular ridges giving it a saw-toothed profile.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |