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US 5,293,737 AGranted
Steel cord for reinforcement of rubber products
AssigneeTokusen Kogyo Co., Ltd.
InventorsYoshirou Kobayashi, Koichi Hinoura, Akihiro Nagamoto
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Abstract
A steel cord for reinforcement of rubber products composed of two material wires of a diameter of 0.25 to 0.40 mm and a carbon content of 0.75 to 0.88 wt % which are entwisted at a twist pitch of 9.0 to 16.0 mm and in open structure, with improved fatigue resistance, flexibility and corrosion resistance.
Claims4
A steel cord for reinforcement of rubber products, comprising:
- a twisted cord formed of only two material wires;
- wherein each of said two material wires has a diameter of 0.25 to 0.40 mm and a carbon content of 0.75 to 0.88 wt %;
- wherein said two material wires are entwisted at a twist pitch of 9.0 to 16.0 mm and have an average preforming rate of 105% to 150%;
- and
- wherein at every cross section along said twisted cord, outer peripheries of said two material wires are tangent to an imaginary elliptical shape which has substantially the same orientation at every cross section along said twisted cord and which has a ratio of length D.sub.1 to breadth D.sub.2 in a range of 1.1.ltoreq.D.sub.1 /D.sub.2 .ltoreq.2.2 at every cross section along said twisted cord, said two material wires being disposed within said imaginary elliptical shape at every cross section along said twisted cord.
2 more elements
A tire comprising:
- a plurality of steel cords;
- a rubber sheet covering said plurality of steel cords;
- and
- wherein each of said plurality of steel cords comprises
- a twisted cord formed of only two material wires,
- wherein each of said two material wires has a diameter of 0.25 to 0.40 mm and a carbon content of 0.75 to 0.88 wt %,
- wherein said two material wires are entwisted at a twist pitch of 9.0 to 16.0 mm and have an average preforming rate of 105% to 150%;
- and
- wherein at every cross section along said twisted cord, outer peripheries of said two material wires are tangent to an imaginary elliptical shape which has substantially the same orientation at every cross section along said twisted cord and which has a ratio of length D.sub.1 to breadth D.sub.2 in a range of 1.1.ltoreq.D.sub.1 /D.sub.2 .ltoreq.2.2 at every cross section along said twisted cord, said two material wires being disposed within said imaginary elliptical shape at every cross section along said twisted cord.
6 more elements
Dependencies are inferred from the claim text.