Patent ID: 9744814
Date: 2017-08-29
CPC Classifications: B29D,B60C

Claim:
1. A pneumatic tire having a rubber member constructed by a rubber ribbon winding body which is formed by spirally winding a rubber ribbon, wherein the rubber ribbon includes a composite rubber ribbon which is formed by a non-conductive rubber, and a conductive rubber partly covering the non-conductive rubber; wherein the composite rubber ribbon has a flat cross sectional shape which is smaller in its thickness than its width, and is gradually reduced in its thickness toward both ends in a width direction thereof; wherein the conductive rubber has a cross sectional area which is equal to or less than 3% of a cross sectional area of the composite rubber ribbon, and forms a surface in one side and a surface in the other side in both ends of the composite rubber ribbon so as to prevent the non-conductive rubber from being exposed on both ends of the composite rubber ribbon; and wherein the rubber member is structured such that the composite rubber ribbons that are adjacent in the width direction are partly overlapped, wherein the conductive rubber forms a surface which is between 50% and 60% of an outer peripheral length in a cross section of the composite rubber ribbon; wherein a conductive route is provided by the conductive rubber which is connected between the composite rubber ribbons; wherein the conductive rubber is provided with a thin portion which extends in the width direction between both ends of the composite rubber ribbon, and a thick portion which is greater in its thickness than the thin portion and forms a full thickness in both ends of the composite rubber ribbon; wherein said thin portion of said conductive rubber extends along a bottom of said composite ribbon between said thick portion at said both ends, said composite ribbon being free of said conductive rubber above said thin portion; and wherein each end of the both ends of the composite rubber ribbon comprises a surface in one side and a surface in another side that are formed of conductive rubber.