The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 24, 1981
Filed:
Jul. 30, 1979
Heinz W Beneze, Akron, OH (US);
The Firestone Tire & Rubber Company, Akron, OH (US);
Abstract
This disclosure relates to a method of manufacturing a pneumatic tire having a cast body of viscoelastic material, a road-engaging tread surface and a girdle member of reinforcing cords located in the crown area of the cast body. The method comprises the steps of assembling an annular hoop assembly with the girdle member (having a predetermined radius of curvature, its reinforcing cords at the exact cord centerline diameter desired in the finished tire, and a predetermined tension on the cords) located on the inner periphery of the hoop assembly and a spacing support member located on the outer periphery of the hoop assembly; inverting or turning the hoop assembly inside out thereby locating the girdle member on the outer periphery (without changing its cord diameter, its radius of curvature and its cord tension) and the spacing support member on the inner periphery; mounting the inverted hoop assembly on the annular core of a tire mold so that the girdle member has its reinforcing cords at the exact cord centerline diameter desired; closing the tire mold; filling it with a viscoelastic material and curing the material. The method of this invention may be used to manufacture a tire with a tread of viscoelastic material or of conventional, carbon black reinforced, rubber. In the method of this invention wherein a conventional rubber tread is used, an additional step is necessary wherein the precured conventional tread is placed in the tread section of the mold prior to the injection of the viscoelastic material.