ANNULAR CONCENTRIC STRANDED BEAD CORD, METHOD FOR MANUFACTURING THE SAME, AND VEHICLE TIRE
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United States of America Patent
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Issued Date -
Aug 12, 2010
app pub date -
Mar 12, 2009
filing date -
Mar 14, 2008
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Abandoned
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Abstract
There are provided an annular concentric stranded bead cord which can realize a reduction in weight while ensuring its strength, a method for manufacturing the same and a vehicle tire.The manufacturing method is a method for manufacturing an annular concentric stranded bead cord by forming a sheath layer by winding spirally a lateral wire round an annular core. After the sheath layer has been formed, the lateral wire is annealed in a pressure-reduced inactive gaseous atmosphere with an annealing quantity which exceeds a heating quantity (temperature×time) which is necessary for vulcanization of a vehicle tire with the annular concentric stranded bead cord embedded in a rubber of the vehicle tire when building the same and is shaped so that “Diameter shaping ratio (%)=H/D×100” becomes 20% or larger and 105% or smaller.
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