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US 5,337,549 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.
Claims8
A steel cord for reinforcement of rubber products, comprising:
- a twisted cord formed of only two material wires twisted together at a primary twist pitch of 9.0 to 16.0 mm;
- where each of said two material wires has a diameter A of 0.25 to 0.40 mm and a carbon content of 0.75 to 0.88 wt %;
- and
- wherein, in said twisted cord, one of said two material wires has substantially no preformed spiral shape and the other of said two material wires is preformed with a secondary substantially spiral shape at a secondary pitch which is substantially smaller than said primary twist pitch.
1 more element
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 twisted together at a primary twist pitch of 9.0 to 16.0 mm,
- wherein each of said two material wires has a diameter A of 0.25 to 0.40 mm and a carbon content of 0.75 to 0.88 wt %, and
- wherein, in said twisted cord, one of said two material wires has substantially no preformed spiral shape and the other of said two material wires is preformed with a secondary substantially spiral shape at a secondary pitch which is substantially smaller than said primary twist pitch.
4 more elements
Dependencies are inferred from the claim text.