Bead core having oppositely twisted bead rings
AssigneeCompagnie Generale Des Etablissements Michelin
InventorDaniel Lejeune
Life of this patent
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Abstract
The fatigue strength of a composite bead ring for pneumatic tires formed of at least two unitary stranded bead rings in tangential contact with each other is increased by having oppositely directed stranding or twisting of the peripheral layers of the wires of said two unitary stranded bead rings.
Claims4
A pneumatic tire with a bead seat and whose bead reinforcement comprises at least two metallic unitary bead rings forming a composite bead ring around which a carcass reinforcement is anchored, the said unitary bead rings being stranded bead rings and being, as seen in radial section, in tangentail contact with each other, characterized by the fact that the said unitary stranded bead rings each comprise a peripheral layer of wires stranded or twisted in opposite direction from the peripheral layer of wires of the other unitary stranded bead ring.
Dependencies are inferred from the claim text.