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:
Jul. 11, 1989
Filed:
Jun. 20, 1988
Yuzo Kumagai, Tokyo, JP;
Yasutoshi Aoki, Tokyo, JP;
Bridgestone Corporation, Tokyo, JP;
Abstract
A method of producing tire belt comprises a first step of attaching a first belt ply to a forming drum having, at its axial ends, curved portions whose diameters reduce progressively toward axially outer ends of the curved portions. The first belt ply has a width wider than an axial length of the forming drum. The method further comprises a second step of expanding the forming drum so that diameters of the curved portions at axially outermost ends become a predetermined diameter smaller than a maximum diameter of the forming drum in the first step to deform a central portion of the first belt ply following to an outer contour of the forming drum, a third step of foldering ends of the first belt ply at axial outer ends of a second belt ply after attaching the second belt ply to a center portion of the first belt ply outwardly thereof, and a fourth step of attaching a third belt ply in plural layers onto the first and second belt plies outwardly thereof.