Resilient tires and wheels – Tires – resilient – Anti-skid devices
Patent
1974-09-27
1976-03-23
Hoffman, Drayton E.
Resilient tires and wheels
Tires, resilient
Anti-skid devices
152330R, 156 96, 156128R, 156129, 156394, B60C 1104
Patent
active
039454177
ABSTRACT:
The tire comprises a preformed carcass having a plurality of precured lugs secured to its circumferential surface by a thick layer-like mass of readily cured cushion gum material. The carcass may be of new construction but would usually be obtained by buffing the circumferential surface of a used and worn lugged tire to render the same substantially smooth and even. The lugs are separately formed by simultaneously molding and precuring retread rubber under high pressure and uniformly-applied heat, so as to possess high strength, density and cut and abrasion-resistance. The carcass, cushion gum and lugs are cemented and stitched together at ambient temperature and in a manner minimizing oxidation at their confronting surfaces. When the circumferential surface of the tire carcass to which the lugs are secured possesses a significant curvature in the width direction thereof, the exterior surfaces of the lugs may be and preferably are provided with stress-relieving grooves in their outer surfaces. The aforesaid assembly is then heated within a steam chamber under differential-pressure conditions for only the limited time necessary to vulcanize the cushion gum material and thereby permanently unite the components.
REFERENCES:
patent: 2474013 (1949-06-01), Rawls
patent: 2611411 (1952-09-01), Rawls
patent: 3136673 (1964-06-01), Carver
patent: 3464874 (1969-09-01), Ragan
patent: 3467159 (1969-09-01), Semonin
patent: 3472714 (1969-10-01), Ragan
patent: 3487868 (1970-01-01), Ragan
patent: 3511291 (1970-05-01), Ragan
patent: 3770038 (1973-11-01), Wolfe
Harrelson Rubber Company
Heard Joseph H.
Hoffman Drayton E.
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