Precured tread for tire retreading and method of producing the same
OwnerShoichi Oyamadainventor
Life of this patent
Estimating the term…
Abstract
A precured tread for tire retreading is adhered to a platform tire to produce a retreaded tire. In the precured tread, a fin portion obliquely and outwardly extending substantially along a slant surface of the precured tread and thinning toward a top side thereof is formed on each of both widthwise end portions of an adhesion surface of the precured tread to be adhered to the platform tire. By using such a precured tread can effectively be controlled the separation failure while maintaining good appearance in the retreaded tire product.
Claims15
In a precured tread for tire retreading vulcanized prior to adhesion to a platform tire and having an approximately trapezoidal shape at its section, an improvement wherein a fin portion obliquely and outwardly extending substantially along a slant surface of the precured tread and thinning toward a top side thereof is formed on each of both widthwise end portions of an adhesion surface of the precured tread to be adhered to the platform tire.
A method of producing a precured tread for tire retreading, which comprises the steps of:
- housing a tread material made of an uncured rubber in a cavity of a vulcanization mold having a molding surface convexly curved substantially at the same radius of curvature as in an adherend surface of a platform tire and inclining both side end portions of the molding surface at an angle larger than that in a center portion thereof while contacting an adhesion surface of the tread material adhered to the platform tire with the molding surface;
- and
- vulcanizing the tread material to form a precured tread having an adhesion surface concavely curved substantially at the same curvature as in the adherend surface and provided on each of both widthwise end portions with a fin portion.
Dependencies are inferred from the claim text.