Sughrue, Mion, Zinn, Macpeak and Seas
Pneumatic radial tire having an improved bead portion reinforcing construction
 A pneumatic radial tire having an improved bead portion reinforcing construction is disclosed. The radial tire comprises a bead portion reinforcing band disposed along the bead portion formed by folding the ply of the carcass body around the bead ring. The bead portion reinforcing band comprises at least one chipper layer. The chipper is composed of a reinforcing element embedded in rubber and formed of 1 to 50 helically formed filaments. The reinforcing element has a modulus of elasticity of 0.029.times.10.sup.4 kg/mm.sup.2 to 1.60.times.10.sup.4 kg/mm.sup.2 and is inclined at a given angle with respect to the ply cords of the carcass body so as to make the chipper as a whole extensible and rigid. 
Bridgestone Tire Company Limited
B B Y Y B B B Y
B60C B60C Y10T Y10T B60C B60C B60C Y10T
inventional inventional additional additional inventional inventional inventional additional
Toshiyuki Kenichi Shigeo
Sogi Motomura Watanabe