US3938575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic tires
Assignee: Compagnie Generale des Etablissements Michelin SCA
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Filing: 1975-04-09
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Granted: 1976-02-17
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Expires: 1995-04-09
Abstract
Abstract The durability and stability of the beads of a radial ply pneumatic tire are improved by making the tensions acting on the main radial carcass ply and on the portion thereof folded over the bead ring different from each other and having the tension acting on the main radial carcass ply greater than the tension acting on the folded-over portion.
Inventors
- 👤 Jacques Boileau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:53
CPC Classifications
B; B60; B60C; B60C3/00; B60C3/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
147 words
In a pneumatic tire with a crown reinforcement formed of at least two crossed oblique plies of cables and a carcass reinforcement comprising at least one ply of radial cables the portion of which folded around the bead ring terminates in a part which is parallel to the carcass reinforcement, the improvement which comprises: a. the equilibrium curve of the carcass reinforcement passes between the center of gravity of the radial section of the bead ring and the point of contact of the carcass ply with the radial cross section of the bead ring, and b. the end of the radius from which the folded-over portion assumes an arrangement parallel to the carcass reinforcement is located at a distance from the center of gravity of the radial section of the bead ring of between 1/5 and 1/3 of the height of the pneumatic tire on its rim.
Claim 2
Dependent Claim
147 words
In a pneumatic tire with a crown reinforcement formed of at least two crossed oblique plies of cables and a carcass reinforcement comprising at least one ply of radial cables the portion of which folded around the bead ring terminates in a part which is parallel to the carcass reinforcement, the improvement which comprises: a. the equilibrium curve of the carcass reinforcement passes between the center of gravity of the radial section of the bead ring and the point of contact of the carcass ply with the radial cross section of the bead ring, and b. the end of the radius from which the folded-over portion assumes an arrangement parallel to the carcass reinforcement is located at a distance from the center of gravity of the radial section of the bead ring of between 1/5 and 1/3 of the height of the pneumatic tire on its rim.
Claim 3
Dependent Claim
26 words
The pneumatic tire defined by claim 1 wherein the terminal part of the folded-over portion parallel to the carcass reinforcement is placed against said carcass reinforcement.
Claim 4
Dependent Claim
51 words
The pneumatic tire defined by claim 1 wherein the end of the terminal part of the folded-over portion parallel to the carcass reinforcement is arranged between the corresponding edge of the crown reinforcement and the carcass reinforcement and the carcass reinforcement together with its folded-over portions is composed of elastic cables.
Claim 5
Dependent Claim
16 words
The pneumatic tire defined by claim 1 wherein the bead rings are of the cabled type.
Claim 6
Dependent Claim
140 words
The pneumatic tire defined by claim 1 wherein the distance x from the center of gravity of the cross section of the bead ring to the equilibrium curve of the carcass reinforcement is defined by the equation ##EQU3## in which a is the length of the projection of the cross section of the bead ring on a straight line passing through the center of gravity of this cross section and perpendicular to the tangent to the equilibrium figure of the carcass reinforcement at the level of the bead ring, b is the distance from the center of gravity of the said cross section to the point where the folded-over portion becomes parallel to the carcass reinforcement, and k is the ratio, greater than 1, between the tension acting on the carcass reinforcement and the tension acting on the folded-over portion.
References Cited (Backward Citations)
US3297073A
Cited
US3253639A
Cited
US3406733A
Cited
FR2082484A5
Cited
FR2165810A1
Cited
US3861442A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |