Steel cords for the reinforcement of rubber articles
AssigneeBridgestone Corporation
InventorKazuyoshi Tagawa
Life of this patent
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Abstract
A steel cord for the reinforcement of rubber article having M parallel+N structure consists of a core of two steel filaments and a single sheath of seven or eight steel filaments, wherein diameters of core filament and sheath filament and twisting pitch have specified ranges, respectively.
Claims8
A steel cord for the reinforcement of rubber article consisting of a core formed by arranging two straight core filaments having a diameter dc side by side in a longitudinal direction without twisting and a sheath formed by twisting seven sheath filaments having a diameter ds around the core, and having a flat profile at its section, wherein the diameter dc of the core filament is within a range of 0.30-0.38 mm, and the diameter ds of the sheath filament is not more than dc+0.03 mm but not less than dc−0.03 mm, and a twisting pitch P of the sheath filament is not less than 50 times the diameter dc of the core filament but not more than 120 times the diameter ds of the sheath filament.
A steel cord for the reinforcement of rubber article consisting of a core formed by arranging two straight core filaments having a diameter dc side by side in a longitudinal direction without twisting and a sheath formed by twisting eight sheath filaments having a diameter ds around the core, and having a flat profile at its section, wherein the diameter dc of the core filament is within a range of 0.30-0.38 mm, and the diameter ds of the sheath filament is not more than dc−0.01 mm but not less than dc−0.03 mm, and a twisting pitch P of the sheath filament is not less than 60 times the diameter dc of the core filament but not more than 120 times the diameter ds of the sheath filament.
Dependencies are inferred from the claim text.