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:
May. 29, 1990
Filed:
Oct. 13, 1988
Masahiro Oku, Osaka, JP;
Kazumitsu Iwamura, Kobe, JP;
Sumitomo Rubber Industries, Ltd., Hyogo, JP;
Abstract
A pneumatic radial tire, which comprises a carcass of at least one ply of radially arranged cords turned up around bead cords from the inside to the outside thereof, and a breaker disposed radially outside the carcass, the breaker comprising at least two radially adjacent plies of cords, the breaker having at least a portion in which the cords of each of the two plies are inclined with respect to an equatorial plane of the tire and the cords of one ply are inclined oppositely to the cords of the other ply, the cords of each of the breaker plies being so arranged that the cord angle QC in a crown portion of the breaker with respect to the equatorial plane differs from the cord angle QS in each of the shoulder portions of the breaker with respect to the equatorial plane, wherein the crown portion is centered on a tire equator and has a width of 0.4 to 0.8 times the maximum width of the breaker, and the shoulder portions are located one on each side of the crown portion, whereby both steering stability and ride comfort are improved in a well balanced manner.