Pneumatic tires
AssigneeBridgestone Corporation
InventorsTetsuhito Tsukagoshi, Takeshi Watanabe, Kuninobu Kadota, Yuichiro Ogawa
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Abstract
A pneumatic tire comprises a carcass comprised of at least one carcass ply containing a steel cord(s) arranged at a cord angle of 70-90° with respect to an equatorial plane of the tire and toroidally extending between a pair of bead cores and turned up around the bead core inward or outward in a radial direction to form a turnup portion, wherein a wrap part wrapping on a peripheral face of the bead core therealong is formed in the turnup portion of the carcass ply.
Claims34
In a pneumatic tire comprising a carcass comprised of at least one carcass ply containing a steel cord(s) arranged at a cord angle of 70-90° with respect to an equatorial plane of the tire and toroidally extending between a pair of bead cores and turned up around the bead core inward or outward in a radial direction to form a turnup portion, the improvement wherein a wrap part wrapping on a peripheral face of the bead core therealong is formed in the turnup portion of the carcass ply.
An apparatus for bending a carcass band for use in the manufacture of the pneumatic tire, comprising a shaft-shaped member provided with an annular groove supporting an end portion of a cylindrical carcass band from an inner or outer circumferential side thereof, and a disc-shaped member located in a position corresponding to the annular groove and pushing the cylindrical carcass band into the annular groove.
An apparatus for manufacturing a pneumatic tire, comprising a carcass band drum forming a cylindrical carcass band, a carcass band bending apparatus for subjecting an end portion of the cylindrical carcass band located on the carcass band drum to bending formation, a bead setter for arranging a ring-shaped bead-core inside the bent end portion of the cylindrical carcass band, a bead lock for supporting the bead core arranged on the bend end portion from its inner peripheral side, and a shaping means for toroidally expanding the cylindrical carcass band.
Dependencies are inferred from the claim text.