Run-flat tire having internal support means

In a pneumatic tubeless tire including a carcass having an outer tread surface, oppositely disposed sidewalls, and a bead confined in each sidewall adjacent the radially inner end thereof forming beaded ends for mounting on a vehicle wheel having rim flanges formed on oppositely disposed sides thereof for retaining the beaded ends in sealing engagement therewith when the tire is inflated, the improvement comprising an annular support member attached to the inner surface of each of the sidewalls at substantially the widest portion thereof, two sets of spaced ribs, each rib of each set having one end thereof integrally formed on one of the annular support members in an alternately crisscrossing relationship around the circumference of the tire, and a radially inwardly directed flange formed on the distal end of each rib and secured to the inner surface of the adjacent end of the tire sidewall, the annular support members and the two sets of alternately spaced ribs providing lateral and radial support to the tire sidewalls, particularly when the tire becomes deflated.

In a pneumatic tubeless tire including a carcass having an outer tread surface, oppositely disposed sidewalls, and a bead confined in each sidewall adjacent the radially inner end thereof forming beaded ends for mounting on a vehicle wheel having rim flanges formed on oppositely disposed sides thereof for retaining the beaded ends in sealing engagement therewith when the tire is inflated, the improvement comprising an annular support member attached to the inner surface of each of the sidewalls at substantially the widest portion thereof, and a plurality of horizontally oriented ribs formed in a spaced relationship around the circumference of the tire, each rib having the oppositely disposed ends thereof integrally formed on the respective annular support members so as to extend across the tire at the widest portion thereof to provide lateral and radial support to the tire sidewalls, particularly when the tire becomes deflated.

In a pneumatic tubeless tire including a carcass having an outer tread surface, oppositely disposed sidewalls, and a bead confined in each sidewall adjacent the radially inner end thereof forming beaded ends for mounting on a vehicle wheel having rim flanges formed on oppositely disposed sides thereof for retaining the beaded ends in sealing engagement therewith when the tire is inflated, the improvement comprising an annular support member attached to the inner surface of each of the sidewalls at substantially the widest portion thereof, and three sets of spaced ribs alternately positioned around the circumference of the tire, and each rib of one set having one end thereof integrally formed on one annular support member and extending horizontally across the tire from the one annular support member to the other annular support member, and the ribs of the other two sets having alternate ends thereof integrally formed on opposite annular support members and the other ends thereof extending in a crisscrossing relationship toward the oppositely disposed beaded ends of the opposite sidewall, and a radially inwardly directed flange formed on the other end of each rib and secured to the inner surface of the adjacent beaded end, the three sets of alternately spaced ribs providing lateral and radial support to the tire sidewalls, particularly when the tire becomes deflated.