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US 4,781,016 AGranted
Steel cords
AssigneeBridgestone Corporation
InventorsMichitaka Sato, Toshio Sugawara
Life of this patent
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Abstract
A steel cord usable for the reinforcement of rubber articles comprises a core of a single steel filament, an inner sheath composed of six steel filaments and an outer sheath composed of 7 to 12 steel filaments, wherein the steel filaments constituting the core, inner sheath and outer sheath have a diameter of 0.20.about.0.40 mm and satisfy the particular relations.
Claims6
A steel cord comprising a core of a single steel filament, an inner sheath composed of six steel filaments spirally wound around the core, and an outer sheath composed of n steel filaments spirally wound around the inner sheath;
- filament number n of the outer sheath being within a range of 7.about.12, and a diameter of the steel filament constituting each of the core, inner sheath and outer sheath being within a range of 0.20 mm to 0.40 mm and satisfying the following relations:
- (a)
- n=7.about.11
- d.sub.c .gtoreq.0.04+d.sub.1 and d.sub.1.gtoreq.d.sub.2
- (b)
- n=12
- d.sub.c 0.04+d.sub.1, and d.sub.2 .gtoreq.0.350 (d.sub.c +2d.sub.1)-0.027
- wherein d.sub.c is a diameter to the core (mm), d.sub.1 is a diameter of the inner sheath (mm) and d.sub.2 is a diameter of the outer sheath (mm).
5 more elements
Dependencies are inferred from the claim text.