Patent ID: 9555667
Date: 2017-01-31
CPC Classifications: B60C

Claim:
1. A puncture-free inner tube having a hollow pipe shape, which is to be inserted in an annular space of an outer tire having an annular shape, which is to be mounted detachably on a tire rim having an annular shape, the puncture-free inner tube comprising a thermoplastic elastomer that is molded by injection molding into a transverse cross sectional shape that is similar or substantially similar to and is slightly larger than a transverse cross section of the annular space of the outer tire, the puncture-free inner tube having a thickness that is gradually increased from a ground part toward an anti-ground part on a side of the tire rim, the puncture-free inner tube being formed in total into an annular shape, and the puncture-free inner tube being insertable in the annular space of the outer tire in a compressed state with a tensile stress of the outer tire, wherein the puncture-free inner tube has, in the anti-ground part on the inner circumferential side thereof facing the tire rim, a continuous opening along an inner circumferential direction of the puncture-free inner tube, the puncture-free inner tube further comprising a plurality of ribs positioned in the continuous opening and spaced along the inner circumferential direction with a constant pitch, thereby forming a partially open structure.