Patent US4435236A successfully refreshed from Google Patents.
US4435236A
Expired / Lapsed
US
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Method of manufacturing a foldable bicycle tire having flexible beads
Assignee: Mitsuboshi Belting Ltd
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Filing: 1982-07-20
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Granted: 1984-03-06
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Expires: 2002-07-20
Abstract
Abstract An improved bicycle tire which can be folded for storage and transportation while maintaining the same running properties as a conventional tire. A plurality of bead cores made of a cord tensile member embedded in the bead section of the tire are provided by winding three to five turns of a cord tensile member having a low elongation ratio and high strength and which has been twisted one to two turns/10 cm in such a manner that the start and finish ends of the bead core overlap one another by 60 to 150 mm. The bead core preferably has a cut elongation of 5% or less and the strength of 300 kg/core.
Inventors
- 👤 Shoji Inae
- 👤 Harunori Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:43
CPC Classifications
B; B60; B60C; B60C15/00; B60C15/0009; B60C15/0036; B60C15/0045; B29; B29D; B29D30/00; B29D30/06; B29D30/48; B29D2030/487; Y; Y10; Y10S; Y10S57/00; Y10S57/902; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10819
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
242 words
A method of manufacturing a tire comprising: the steps of; twisting two untwisted linear members having a low elongation ratio and high strength supplied from corresponding bobbins at 1 to 2 turns/10 cm to form a cord tensile member, adhesion treating said cord tensile member; drying said cord tensile member; covering said cord tensile member with rubber; accumulating the rubber covered cord tensile member in an accumulator; winding a bias tire fabric having a predetermined width and length on a former in the outer wall of which bead grooves spaced a predetermined distance from each other are formed; joining both ends of said bias tire fabric to form an endless tire fabric; winding said cord tensile member accumulated in said accumulator on said endless tire fabric on a drum of said former along each of said bead grooves to three to five turns; overlapping start and finish ends of said cord tensile member wound along each bead groove 60 to 150 mm; bonding together said start and finish ends with bead rubber to form a bead core having a cut elongation of 5% or less and a strength of 300 kg/core; folding both sides of said endless tire fabric inwardly along said bead cores to form a tire fabric member with beads; bonding a tread rubber member having predetermined width and length to said tire fabric member with beads to form an unvulcanized tire; and vulcanizing said unvulcanized tire under predetermined conditions.
Claim 2
Independent Claim
242 words
A method of manufacturing a tire comprising: the steps of; twisting two untwisted linear members having a low elongation ratio and high strength supplied from corresponding bobbins at 1 to 2 turns/10 cm to form a cord tensile member, adhesion treating said cord tensile member; drying said cord tensile member; covering said cord tensile member with rubber; accumulating the rubber covered cord tensile member in an accumulator; winding a bias tire fabric having a predetermined width and length on a former in the outer wall of which bead grooves spaced a predetermined distance from each other are formed; joining both ends of said bias tire fabric to form an endless tire fabric; winding said cord tensile member accumulated in said accumulator on said endless tire fabric on a drum of said former along each of said bead grooves to three to five turns; overlapping start and finish ends of said cord tensile member wound along each bead groove 60 to 150 mm; bonding together said start and finish ends with bead rubber to form a bead core having a cut elongation of 5% or less and a strength of 300 kg/core; folding both sides of said endless tire fabric inwardly along said bead cores to form a tire fabric member with beads; bonding a tread rubber member having predetermined width and length to said tire fabric member with beads to form an unvulcanized tire; and vulcanizing said unvulcanized tire under predetermined conditions.
Claim 3
Dependent Claim
16 words
The method as claimed in claim 1 wherein said former is of a separable one-drum type.
Claim 4
Dependent Claim
26 words
The method as claimed in claim 1 wherein said former is of a two-drum type in which a distance between axes of two drums is adjustable.
Claim 5
Dependent Claim
70 words
The method as claimed in claim 3 wherein said step of winding said bias tire fabric comprises winding a belt-shaped bias tire fabric having a width slightly larger than a distance between said bead grooves and further comprising the step of winding a second belt-shaped bias tire fabric onto said first-mentioned bias tire fabric, said second belt-shaped bias tire fabric having a lesser width than said first-mentioned bias tire fabric.
Claim 6
Dependent Claim
63 words
The method as claimed in claim 1 wherein, in said step of winding said bias tire fabric on said former, said cord tensile member is wound on said former under a tension of 2 kg or less while said former makes a first half revolution, and under a tension of 5 to 20 kg after said former has completed said first half revolution.
Claim 7
Dependent Claim
63 words
The method as claimed in claim 1 wherein, in said step of widning said bias tire fabric on said former said rope tensile member is wound on said former under a tension of 2 kg or less while said former makes a first half revolution, and under a tension of 7 to 10 kg after said former has completed said first half revolution.
Claim 8
Independent Claim
55 words
The method as claimed in any of claims 1 through 6 wherein, in said tire vulcanizing step, at least one of a bead diameter and bead circumferential length of a tire vulcanizing metal mold is smaller by 0.1 to 0.5% than a corresponding inside diameter and inner circumference of each bead groove of said former.
Claim 9
Independent Claim
40 words
The method as claimed in any one of claims 1 through 6 wherein, in said tire vulcanizing step, a bead diameter of a tire vulcanizing metal mold is smaller by 0.1 to 0.5% than that of a conventional metal mold.
Claim 10
Independent Claim
41 words
The method as claimed in any of claims 1 through 6 wherein said linear members are made of a material selected from the group consisting of thin strands of hardened steel, polyamide fiber strands, glass fiber strands and carbon fiber strands.
References Cited (Backward Citations)
US1609620A
Cited
US1914040A
Cited
FR992617A
Cited
US3446003A
Cited
US4022009A
Cited
US4098316A
Cited
US4293018A
Cited
US4320791A
Cited
US4378042A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |