Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Reexamination Certificate
1998-07-09
2001-07-17
Johnstone, Adrienne C. (Department: 1733)
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
C152S548000, C152S558000, C156S117000
Reexamination Certificate
active
06260598
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a pneumatic tire having an improved tire reinforcing structure being capable of preventing ply steer.
DESCRIPTION OF THE RELATED ART
In bias tires or cross ply tires, the carcass cords are inclined relatively large angles, for example 30 to 50 degrees with respect to the circumferential direction of the tire, and the cord arrangement is not symmetrical with respect to the tire equator. In radial tires, on the other hand, a breaker made of cross plies is usually disposed inside the tread. The breaker cords are also inclined relatively large angles. Thus such tires involve problems of ply steer, which is especially remarkable in the tires for motorcycles.
BRIEF SUMMARY OF THE INVENTION
It is therefore, an object of the present invention to provide a pneumatic tire which has a novel reinforcing structure being usable instead of the conventional bias carcass structure or belt structure and having a completely symmetrical cord arrangement to effectively prevent the ply steer.
In accordance with the present invention, a pneumatic tire is provided which comprises: a tread portion, a pair of sidewall portion, a pair of bead portions, and a tread-sidewall reinforcement extending between the sidewall portions trough the tread portion, the tread-sidewall reinforcement made of a series of loops of at least one reinforcing cord spreading over the circumference of the tire.
REFERENCES:
patent: 1930764 (1933-10-01), Mallory
patent: 2906314 (1959-09-01), Trevaskis et al.
patent: 4231408 (1980-11-01), Replin
patent: 4248287 (1981-02-01), Christman
patent: 4917744 (1990-04-01), Knipp et al.
patent: 208941C (1909-04-01), None
patent: 228647C (1910-11-01), None
patent: 0129183A2 (1984-12-01), None
patent: 1141940A (1957-11-01), None
patent: 498507A (1939-02-01), None
patent: 786164A (1957-11-01), None
Birch & Stewart Kolasch & Birch, LLP
Johnstone Adrienne C.
Sumitomo Rubber Industries Ltd.
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