Bicycle tire with compression amplification

Details Bicycle tire with compression amplification Bicycle tire with compression amplification

1978-05-16

1982-05-04

Reeves, Robert B.

Resilient tires and wheels

Tires, resilient

Cushion

152312, B60C 700

Patent

active

043277934

ABSTRACT:
A solid, monolithic bicycle tire made of urethane rubber with a cured hardness of from 60 to 70 Durometer A. The tire is formed with a pair of laterally spaced bead shoulders that seat on the bead seats of the wheel rim, and is generally triangular in cross-section, with radially outwardly converging, slightly concave side walls that merge into a relatively narrow tread section. A circumferential, arch-shaped tunnel is formed in the inner side of the tire between the bead shoulders, and the material between the tunnel and the converging outer surfaces forms narrow, inwardly inclined side walls that are compressed when pressure is applied radially inwardly against the tread. The inclination of the side walls results in a substantial amplification of the deflection of the tire under impact loads, as compared to the deflection of similar-thickness side walls that are not inclined, but instead, are parallel to one another. As the tire is compressed under load, the side walls tend to collapse inwardly, causing the bead shoulders to grip the wheel rim with increasing force, thereby resisting any tendency of the bead shoulders to climb up over the edge of the wheel rim. The tire is also held firmly on the rim by means of a circumferential bead-locking insert that is placed in the bottom of the wheel rim before the tire is mounted. Foot extensions at the bottom edges of the tire side walls are then pressed down into the space between the wheel rim and the insert, and the insert acts to hold the foot extension and bead shoulder firmly against the wheel rim so as to resist any tendency of the foot extension or bead shoulder to climb.

REFERENCES:
patent: 365091 (1887-06-01), Owen
patent: 4127166 (1978-11-01), Wyman

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