Rubber article-reinforcing 2+8 steel cords and pneumatic tires using such steel cords
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United States of America Patent
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May 25, 1993
Issued Date -
N/A
app pub date -
Dec 27, 1990
filing date -
Dec 7, 1988
priority date (Note) -
Expired
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Abstract
A steel cord comprising a core and a sheath arranged around the core. The core consists of two steel filaments, and the sheath consists of eight steel filaments. The diameter of each of the filaments is in a range from 0.30 to 0.42 mm, and a difference D.sub.c -D.sub.s between the diameter D.sub.c of the filaments of the core and that D.sub.s of the sheath is not less than 0.04 mm. The twisted direction of the core is the same as that of the sheath, and a ratio P.sub.s /P.sub.c between a pitch P.sub.s of the sheath and that of P.sub.c of the core is in a range from 1.4 to 3.0.
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