US3578056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Run-flat combat tire
Assignee: United States Department of the Army
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Filing: 1969-05-20
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Granted: 1971-05-11
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Expires: 1989-05-20
Abstract
Abstract To provide an improved military run-flat combat tire, a conventional tubular tire casing is equipped with a smaller diameter, pressureless, filament wound, reinforced fiberglass toroid capable of supporting the vehicle at relatively high sustained speeds after the tubeless tire has been punctured.
Inventors
- 👤 Walter P Wynbelt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:57
CPC Classifications
B; B60; B60C; B60C17/00; B60C17/01; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10522; Y10T152/10576; Y10T152/10594
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
96 words
An insert for a tubeless pneumatic tire comprising a pressureless, filament wound, reinforced fiberglass toroid having an inner ring diameter and an outer ring diameter said inner ring diameter substantially equal to the diameter of a rim upon which said pneumatic tire may be mounted and said outer ring diameter being such that when said insert is placed within said pneumatic tire, said toroid is substantially spaced from the inner periphery of said pneumatic tire and when said tire loses pressure said toroid engages said inner periphery to support the load on the tire without collapsing.
Claim 2
Dependent Claim
96 words
An insert for a tubeless pneumatic tire comprising a pressureless, filament wound, reinforced fiberglass toroid having an inner ring diameter and an outer ring diameter said inner ring diameter substantially equal to the diameter of a rim upon which said pneumatic tire may be mounted and said outer ring diameter being such that when said insert is placed within said pneumatic tire, said toroid is substantially spaced from the inner periphery of said pneumatic tire and when said tire loses pressure said toroid engages said inner periphery to support the load on the tire without collapsing.
Claim 3
Dependent Claim
23 words
The insert of claim 1 including means for inflating and deflating said pneumatic tire while said toroid is inserted in said pneumatic tire.
Claim 4
Dependent Claim
134 words
In combination a tire rim, a tubeless pneumatic tire and a semirigid, filament wound, reinforced fiberglass toroid, said tubeless pneumatic tire having an inner periphery, sidewalls, and an inner cavity defined by said inner periphery and said sidewalls and being mounted on said tire rim, said semirigid, filament wound, reinforced fiberglass toroid having an inner ring diameter and an outer ring diameter said inner ring diameter substantially equal to the diameter of said tire rim and said outer ring diameter substantially larger than said inner ring diameter and substantially smaller than the diameter of said inner periphery of said pneumatic tire, said toroid being mounted inside said cavity in such a fashion that when said pneumatic tire loses pressure said toroid engages said inner periphery to support the load on the tire without collapsing.
Claim 5
Dependent Claim
134 words
In combination a tire rim, a tubeless pneumatic tire and a semirigid, filament wound, reinforced fiberglass toroid, said tubeless pneumatic tire having an inner periphery, sidewalls, and an inner cavity defined by said inner periphery and said sidewalls and being mounted on said tire rim, said semirigid, filament wound, reinforced fiberglass toroid having an inner ring diameter and an outer ring diameter said inner ring diameter substantially equal to the diameter of said tire rim and said outer ring diameter substantially larger than said inner ring diameter and substantially smaller than the diameter of said inner periphery of said pneumatic tire, said toroid being mounted inside said cavity in such a fashion that when said pneumatic tire loses pressure said toroid engages said inner periphery to support the load on the tire without collapsing.
Claim 6
Dependent Claim
19 words
The combination of claim 3 including means for inflating and deflating said pneumatic tire with said toroid in place.
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |