US4137894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic tire, rim and run-flat system combination
Assignee: Bridgestone Firestone Inc
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Filing: 1977-06-17
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Granted: 1979-02-06
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Expires: 1997-06-17
Abstract
Abstract This disclosure relates to a tire and rim combination having run-flat capabilites. These capabilities are provided by a run-flat support system which is comprised of a pneumatic tube member located in the drop center area of the rim and an annular, "free-floating" ring member riding on the tube which contacts only the tube when the tire is operating under normal conditions and only the tube and inner periphery of the tread area of the tire when the tire is run flat.
Inventors
- 👤 James D. Gardner
- 👤 James P. Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:41
CPC Classifications
B; B60; B60C; B60C17/00; B60C17/01; B60C19/00; B60C2019/006
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
170 words
In combination, a pneumatic tire, a rim and a run-flat support system, said pneumatic tire comprising an annular tread portion and sidewalls connecting the lateral edges of said tread to bead areas which contain annular bead bundles, said rim comprising an annular drop center area having laterally extending bead seats on either side thereof which terminate in rim flanges, said run-flat support system comprising a pneumatic tube member and a separate, free-floating ring member, said tube member located in the drop center area of said rim and said ring member located radially outwardly of said tube in contact with said tube, said tube member having a fabric reinforcement with the cords of said fabric disposed substantially parallel to the axis of rotation of said combination, said ring member supported solely by said tube during both the normal and run-flat operation of said combination so that said ring member does not contact said rim or said tire sidewalls or bead areas when the tire is either under normal load or run-flat.
Claim 2
Dependent Claim
170 words
In combination, a pneumatic tire, a rim and a run-flat support system, said pneumatic tire comprising an annular tread portion and sidewalls connecting the lateral edges of said tread to bead areas which contain annular bead bundles, said rim comprising an annular drop center area having laterally extending bead seats on either side thereof which terminate in rim flanges, said run-flat support system comprising a pneumatic tube member and a separate, free-floating ring member, said tube member located in the drop center area of said rim and said ring member located radially outwardly of said tube in contact with said tube, said tube member having a fabric reinforcement with the cords of said fabric disposed substantially parallel to the axis of rotation of said combination, said ring member supported solely by said tube during both the normal and run-flat operation of said combination so that said ring member does not contact said rim or said tire sidewalls or bead areas when the tire is either under normal load or run-flat.
Claim 3
Dependent Claim
32 words
The combination of claim 1 in which the maximum section height of said ring member is 40 to 70% of the maximum section height of said tire when inflated under standard conditions.
Claim 4
Dependent Claim
35 words
In the combination of claim 1 wherein the maximum section width of said ring member is 30 to 60% of the maximum section width of said pneumatic tires when it is inflated under standard conditions.
Claim 5
Dependent Claim
26 words
The combination of claim 1 wherein said tube member contains a higher inflation pressure than the tire cavity defined by said pneumatic tire and said rim.
Claim 6
Dependent Claim
20 words
The combination of claim 4 wherein said tube member is inflated to between 40 and 80 pounds per square inch.
Claim 7
Dependent Claim
36 words
The combination of claim 1 wherein the outer periphery of said ring member contains a lubricating substance to prevent abrasion between said ring member and the inner periphery of said tire when the tire is run-flat.
Claim 8
Dependent Claim
25 words
The combination of claim 1 wherein the internal surface of said ring member is concave and the external surface of said tube member is convex.
Claim 9
Dependent Claim
29 words
The combination of claim 7 wherein the radius of said concave surface of said ring member is greater than the radius of said convex surface of said tube member.
References Cited (Backward Citations)
CA502594A
Cited
US1215717A
Cited
US1626511A
Cited
US1626512A
Cited
US2169041A
Cited
US2224066A
Cited
GB615076A
Cited
GB679642A
Cited
FR1135637A
Cited
FR1163953A
Cited
US3142326A
Cited
US3113604A
Cited
US3225811A
Cited
US3508596A
Cited
US4008743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |