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:
Apr. 25, 1978
Filed:
Jul. 12, 1976
Luigi Maiocchi, Milan, IT;
Industrie Pirelli S.p.A., Milan, IT;
Abstract
A pneumatic tire for a vehicle wheel using a flanged rim has a bead structure which provides for a gradual decrease in rigidity between the area of the bead and the sidewall of the tire. The bead has an annular wire, at least one ply of the carcass wound about the wire and extending axially therefrom into the sidewall of the tire and a rubber filler filling the space between the turned-up portion of the ply and that portion on the opposite side of the annular wire. An annular fabric member is disposed over the turned-up portion of the carcass ply and extends beyond the end of the carcass ply into the sidewall of the tire. The rigidities of the metallic fabric and of the filler are balanced against each other so that the rigidity in the bead area of the tire gradually decreases from the bead into the sidewall of the tire. The filler is rubber having a Shore A hardness between 70.degree. and 80.degree. or 100% modulus between 65 and 85 kg/cm.sup.2. The metallic fabric has its cords disposed in a high elongation lang lay. The metallic cords in the fabric are disposed at an angle of between 15.degree. and 45.degree. with respect to the circumferential direction of the tire. Preferably the metallic fabric has about 41/2 cords per cm.