Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Reexamination Certificate
1999-07-26
2001-08-21
Johnstone, Adrienne C. (Department: 1733)
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
C152S516000
Reexamination Certificate
active
06276416
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a pneumatic tire more particularly to a run-flat tire improved in run-flat performance.
2. Description of the Related Art
Run-flat tires of which sidewall portions are reinforced with hard rubber have a crescent sectional shape and are disclosed in the laid-open Japanese patent applications JP-A-53-18104, JP-A-64-30809 and JP-A-4-154411. Those tires are designed to support tire loads under a flat condition by the rigidity, especially bending rigidity of the sidewall portions between the road surface and the wheel rim. As a result, it is difficult to avoid some deterioration in ride comfort under normal conditions, as well as a great increase in the tire weight and a resultant deterioration in dynamic tire performance.
SUMMARY OF THE INVENTION
It is therefore, an object of the present invention to provide a run-flat tire from which the above-mentioned drawbacks are eliminated by simple and novel load supporting means.
According to the present invention a run-flat tire comprises
a tread portion,
a pair of sidewall portions,
a pair of bead portions with a bead core therein,
a carcass ply extending between the bead portions through the tread portion and sidewall portions and turned up around the bead cores to be secured thereto, and
a pair of axially spaced rigid rings each disposed inside the carcass ply in one of the shoulder regions.
Preferably, each said ring is embedded in a bulge of rubber formed on the inside of the tire.
REFERENCES:
patent: 53-18104A (1978-02-01), None
patent: 64-30809 (1989-02-01), None
patent: 4154411 (1992-05-01), None
Birch & Stewart Kolasch & Birch, LLP
Johnstone Adrienne C.
Sumitomo Rubber Industries Ltd.
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