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US 6,109,017 AGranted
Steel cord and steel radial tire
AssigneeTokyo Rope Mfg. Co., Ltd.
InventorHiroshi Kawatani
Life of this patent
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Abstract
A steel cord according to this invention comprises two core wires and five outer wires each having a diameter larger than that of each core wire and integrally twisted on the core wires, wherein a strand constituted by the five outer wires and the two core wires has an oblong cross-section.
Claims9
A steel cord comprising:
- two core wires each preformed to have a preforming percentage Kc before a strand is formed, said two core wires having substantially the same diameter;
- and
- five outer wires each having a diameter larger than that of each core wire and integrally twisted on said core wires,
- said five outer wires each being preformed to have a preforming percentage Ks before said strand is formed, said five outer wires also having substantially the same diameter, said strand being formed by said five outer wires and said two core wires, and having an oblong cross section,
- wherein a ratio of a diameter of each of said outer wires to a diameter of each of said core wires falls within a range of 1.45 to 2.25, and the preforming percentage Kc of said two core wires is greater than the preforming percentage Ks of said five outer wires.
2 more elements
A steel radial tire reinforced with a steel cord, said steel cord comprising:
- two core wires, and
- five outer wires each having a diameter larger than that of each core wire and integrally twisted on said core wires,
- wherein a strand constituted by said five outer wires and said two core wires has an oblong cross-section, and
- wherein steel wires having a tensile strength falling within a range of 300 to 360 kgf/mm.sup.2 are used as said core and outer wires.
1 more element
A steel radial tire reinforced with a steel cord, said steel cord comprising:
- two core wires;
- and
- five outer wires each having a diameter larger than that of each core wire and integrally twisted on said core wires,
- wherein a strand constituted by said five outer wires and said two core wires has an oblong cross-section, and
- wherein a preforming percentage of said outer wire is set different from that of said core wire prior to simultaneous twisting of said outer and core wires.
2 more elements
Dependencies are inferred from the claim text.