Steel cords for the reinforcement of rubber articles
AssigneeBridgestone Corporation
InventorYujiro Umezawa
Life of this patent
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Abstract
A steel cord for the reinforcement of rubber articles is disclosed, which comprises a central base structure composed of 1 to 4 steel filaments, and at least one coaxial layer composed of plural steel filaments arranged around the central base structure so as to adjoin them to each other, these steel filaments being twisted in the same direction at the same pitch. In the steel cord of this type, the steel filaments constituting the central base structure have the same diameter (dc), while at least one steel filament of the coaxial layer has a diameter (dso) smaller than the diameter (dc) of the steel filament in the central base structure.
Claims11
In a steel cord for the reinforcement of rubber articles comprising a central base structure composed of 2 to 4 steel filaments, and at least one coaxial layer composed of plural steel filaments arranged around the central base structure, the steel filaments of the coaxial layer and the central base structure being twisted in the same direction at the same pitch, the improvement wherein the steel filaments constituting the central base structure have the same diameter (dc), while a steel filament in the coaxial layer which contacts with the adjoining steel filaments of said central base structure has a diameter (dsi) equal to the diameter (dc) and the remaining steel filaments in the coaxial layer have a diameter (dso) smaller than the diameter (dc) and a ratio of dc/dso is within a range of 1.03 to 1.25.
Dependencies are inferred from the claim text.