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:
Jun. 06, 1989
Filed:
May. 07, 1987
Bridgestone Corporation, Tokyo, JP;
Abstract
In order to improve the wandering performance of a radial tire, that is, to increase the camber thrust, the camber torque and the self-alignment effort of the tire without degrading various performances required for the radial tire, the radial tire is formed with a plurality of main zigzag wide grooves extending in the circumferential direction of the tire; at least one auxiliary straight narrow groove disposed on the shoulder rib and extending in a circumferential direction of the tire; and a plurality of sipes arranged outside the auxiliary groove at regular intervals along the outermost circumferential edge of the tire and extending in the lateral direction of the tire from the outermost end of the tire to the auxiliary groove. The width W.sub.a of the auxiliary groove is 1 to 4% of that of the main grooves W.sub.m ; the outward inclination angle .theta..sub.a is 10 to 60 degrees with respect to a normal line perpendicular to the tread outer surface; the position of the auxiliary groove is such that a distance S.sub.a from an outermost edge of the tread thereto is 20 to 80% of a distance S.sub.m from the same outermost edge to the main grooves.