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US 4,938,015 AGranted
Reinforcing steel cords
AssigneeBridgestone Bekaert Steel Cord Co., Ltd.
InventorMitsuru Kinoshita
Life of this patent
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Abstract
A steel cord for the reinforcement of rubber products and the like has an open twisted structure comprised of 3 to 6 steel filaments each having an ellipsoidally helical shape, and has a particular tensile elongation under a load of 5 kg.
Claims5
A reinforcing steel cord having an open twisted structure obtained by twisting 3 to 6 steel filaments each having an ellipsoidally helical shape, said ellipsoid being represented by the following equation:
- (x/a).sup.2 +(y/b).sup.2 =1,
- where:
- a is the major axis of the ellipse,
- b is the minor axis of the ellipse,
- x is the variable major axis of a helically formed filament.
- y is the variable minor axis of a helically formed filament provided b/a:
- 0.70-0.90, and said cord having a tensile elongation of 0.50-0.90% under a load of 5 kg/cord.
4 more elements
Dependencies are inferred from the claim text.