Method of manufacturing a foldable bicycle tire having flexible beads
AssigneeMitsuboshi Belting Ltd.
InventorsShoji Inae, Harunori Okamoto
Life of this patent
Estimating the term…
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.
Claims9
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.
Dependencies are inferred from the claim text.