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:
Sep. 15, 1981
Filed:
Jan. 15, 1980
Bridgestone Tire Company Limited, Tokyo, JP;
Abstract
A pneumatic radial tire for heavy load vehicles including an improved bead portion reinforcing construction constructed such that the cords of a reinforcing layer along the outside of a carcass ply are inclined on a circle formed by the upper end of a turn-up region of the carcass ply at an angle of 50.degree. to 70.degree. with respect to the radial plane of the tire and have an air gap ratio .delta. of 38% to 60% measured at a region where the cords of the reinforcing layer cross with a line tangent to a curved surface of a rim flange and extending in parallel with the rotary axis of the tire and given by the following formula ##EQU1## where b is a distance between two midlines of two adjacent cords, measured perpendicular to the cords, and c is a cord diameter.