Patent US4047552A successfully refreshed from Google Patents.
US4047552A
Expired / Lapsed
US
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Pneumatic radial tire for heavy load vehicles
Assignee: Bridgestone Corp
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Filing: 1976-08-06
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Granted: 1977-09-13
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Expires: 1996-08-06
Abstract
Abstract A pneumatic radial tire for heavy load vehicles comprises a carcass and a belt for reinforcement of the carcass, said belt including tension members composed of at least two rubberized metal cords crossing with each other at a cord angle of not more than 25° with respect to equatorial plane of tire, in which said metal cords is coated with a rubber having a modulus of elasticity of 40-80 Kg/cm 2 , a distance between the cords in each tension member is widened to 0.2-0.75 d based on a diameter d of the cord, and an interlaminar cord distance D between the tension members is uniformly shortened to 0.2-0.4 d at a central region extending within 50-80% of a superposed width of the tension members.
Inventors
- 👤 Muneyoshi Maeda
- 👤 Shigeo Watanabe
- 👤 Hidenori Takahashi
- 👤 Toshiyuki Sogi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:23
CPC Classifications
B; B60; B60C; B60C9/00; B60C9/18; B60C9/20; B60C9/2003; B60C9/2006; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10765; Y10T152/10792; Y10T152/1081
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
173 words
A pneumatic radial tire for heavy load vehicles comprising a carcass composed of ply cords lying in a radial plane of the tire or forming a very small angle with said plane and a belt for reinforcement of said carcass including tension members composed of at least two rubberized metal cords crossing with each other at a cord angle of not more than 25° with respect to the equatorial plane of the tire, characterized by coating said metal cords of said tension members with a rubber having a modulus of elasticity of 40-80 Kg/cm 2 , and by widening a distance W between the cords in each of said tension members to 0.2-0.75 d based on a diameter d of said metal cord, and by uniformly shortening an interlaminar cord distance D between said tension members to 0.2-0.4d at a central region extending within 50-80% of a superposed width of said tension members, and by gradually separating said tension members with respect to each other from said central region toward both edges thereof.
Claim 2
Dependent Claim
173 words
A pneumatic radial tire for heavy load vehicles comprising a carcass composed of ply cords lying in a radial plane of the tire or forming a very small angle with said plane and a belt for reinforcement of said carcass including tension members composed of at least two rubberized metal cords crossing with each other at a cord angle of not more than 25° with respect to the equatorial plane of the tire, characterized by coating said metal cords of said tension members with a rubber having a modulus of elasticity of 40-80 Kg/cm 2 , and by widening a distance W between the cords in each of said tension members to 0.2-0.75 d based on a diameter d of said metal cord, and by uniformly shortening an interlaminar cord distance D between said tension members to 0.2-0.4d at a central region extending within 50-80% of a superposed width of said tension members, and by gradually separating said tension members with respect to each other from said central region toward both edges thereof.
Claim 3
Dependent Claim
22 words
A pneumatic radial tire as claimed in claim 1, wherein said modulus of elasticity of said rubber is 50-65 Kg/cm 2 .
Claim 4
Dependent Claim
25 words
A pneumatic radial tire as claimed in claim 1, wherein said distance W between the cords in each of said tension members is 0.25-0.40 d.
Claim 5
Dependent Claim
19 words
A pneumatic radial tire as claimed in claim 1, wherein said interlaminar cord distance D is about 0.35 d.
Claim 6
Dependent Claim
46 words
A pneumatic radial tire as claimed in claim 1, wherein between said tension members separated with each other from said central region toward both edges thereof is coated a rubber at such a thickness that said interlaminar cord distance D is 0.3-3.0 d, preferably 0.6-2.2 d.
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) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |