Patent ID: 6415593
Filing Date: 2002-07-09
Classification: B60C,D07B,Y10S

Abstract:
A steel cord formed by twisting a plurality of bunches of zigzag filaments together at a twisting pitch (Pc),each said bunch formed by twisting zigzag filaments together at a twisting pitch (Pf), each said zigzag filament being zigzaged two-dimensionally or in a plane by a zigzag pitch length (Pw) and a zigzag wave height (h) and being made up of straight segments each extending between zigzag peak points, said zigzag filaments including at least two kinds of zigzag filaments having different zigzag pitch lengths (Pw), the zigzag pitch length (Pw) and zigzag wave height (h) of each said zigzag filament being constant along the longitudinal direction thereof, each said bunch made up of at least two kinds of zigzag filaments, the number of the filaments in each bunch being 2 or 3, the total number of the filaments being 8 to 10, said zigzag filaments having a diameter (d) of 0.30 to 0.45 mm, the twisting pitch (Pc) being 10 to 40 mm, the twisting pitch (Pf) being 3 to 20 times the twisting pitch (Pc), the zigzag pitch length (Pw) being 5.0 to 30.0 times the diameter (d), the zigzag wave height (h) being 0.2 to 3.0 times the diameter (d), the product of the diameter (d) and height (h) being in 0.014 to 0.028 times the pitch length (Pw).