US4436131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic radial tires
Assignee: Bridgestone Corp
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Filing: 1982-09-24
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Granted: 1984-03-13
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Expires: 2002-09-24
Abstract
Abstract A pneumatic radial tire is disclosed, which comprises as a reinforcement a belt consisting of a first belt body composed of a single ply containing metal twisted cords arranged at an inclination angle of 5°-25° with respect to the equatorial plane of the tire and embedded in a coating rubber, both end portions in widthwise direction of which being folded on the remaining central base portion thereof, and a second belt body composed of at least one rubberized ply containing inextensible cords crossed with the cords in the base portion of the first belt body. In the first belt body, the coating rubber has a dynamic modulus of 160-400 kg/cm 2 and a gauge of rubber interposed between the cords in the base portion and the cords in the folded portion is within a range of 1.3-4.5 times an average diameter of the cords and is not less than 2 times a gauge of the coating rubber located outside the cords in the base portion opposite to the folded portion.
Inventors
- 👤 Yutaka Yamaguchi
- 👤 Nobuyuki Koizumi
- 👤 Tamio Araki
- 👤 Koichi Kojima
- 👤 Nobumasa Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:09
CPC Classifications
B; B60; B60C; B60C9/00; B60C9/18; B60C9/26; Y; Y10; Y10S; Y10S57/00; Y10S57/902; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10765; Y10T152/1081
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
237 words
In a pneumatic radial tire comprising a tread portion, a pair of sidewall portions extending from both sides of the tread portion, a pair of bead portions extending from the sidewall portions, a carcass of radial structure extending from one bead portion to the other and composed of at least one rubberized ply containing cords therein, and a belt superimposed about a crown portion of the carcass and consisting of a first belt body composed of a single ply containing metal twisted cords arranged at an inclination angle of 5°-25° with respect to the equatorial plane of the tire and embedded in a coating rubber, both end portions in widthwise direction of which being folded on the remaining central base portion thereof, and a second belt body composed of at least one rubberized ply containing inextensible cords inclined with respect to the equatorial plane and crossed with the cords in the base portion of the first belt body, the improvement in which the coating rubber for the first belt body has a dynamic modulus of 160-400 kg/cm 2 and a thickness of rubber interposed between the cords in the base portion and the cords in the folded portion is within a range of 1.3-4.5 times an average diameter of the cords and is not less than 2 times a thickness of the coating rubber located outside the cords in the base portion opposite to the folded portion.
Claim 2
Dependent Claim
237 words
In a pneumatic radial tire comprising a tread portion, a pair of sidewall portions extending from both sides of the tread portion, a pair of bead portions extending from the sidewall portions, a carcass of radial structure extending from one bead portion to the other and composed of at least one rubberized ply containing cords therein, and a belt superimposed about a crown portion of the carcass and consisting of a first belt body composed of a single ply containing metal twisted cords arranged at an inclination angle of 5°-25° with respect to the equatorial plane of the tire and embedded in a coating rubber, both end portions in widthwise direction of which being folded on the remaining central base portion thereof, and a second belt body composed of at least one rubberized ply containing inextensible cords inclined with respect to the equatorial plane and crossed with the cords in the base portion of the first belt body, the improvement in which the coating rubber for the first belt body has a dynamic modulus of 160-400 kg/cm 2 and a thickness of rubber interposed between the cords in the base portion and the cords in the folded portion is within a range of 1.3-4.5 times an average diameter of the cords and is not less than 2 times a thickness of the coating rubber located outside the cords in the base portion opposite to the folded portion.
Claim 3
Dependent Claim
33 words
A pneumatic radial tire according to claim 1, wherein the rubber interposed between the cords in the base portion and the cords in the folded portion is entirely composed of the coating rubber.
Claim 4
Dependent Claim
26 words
A pneumatic radial tire according to claim 1, wherein the folded portion of the first belt body is located on the side of the tread portion.
Claim 5
Dependent Claim
52 words
A pneumatic radial tire according to claim 3, wherein the folded portion of the first belt body is located on the side of the tread portion and at the same time the second belt body is closed to the base portion of the first belt body on the side of the carcass.
Claim 6
Dependent Claim
33 words
A pneumatic radial tire according to claim 1, wherein the cord for the first belt body is an elastic metal twisted cord having an elongation of 0.3-2.5% under a load of 5 kg/cord.
Claim 7
Dependent Claim
32 words
A pneumatic radial tire according to claim 1, wherein the folded portion of the first belt body has a width corresponding to 17-40% of a whole width of the first belt body.
References Cited (Backward Citations)
US4286645A
Cited
US4258774A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |