Steel cord, method of making the same and pneumatic tire...

Details Steel cord, method of making the same and pneumatic tire... Steel cord, method of making the same and pneumatic tire...

2005-11-01

2005-11-01

Johnstone, Adrienne C. (Department: 1733)

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

C057S200000, C057S311000, C057S902000, C152S451000

Reexamination Certificate

active

06959745

ABSTRACT:
A steel cord is composed of three to six steel filaments each having a filament diameter of from 0.25 to 0.45 mm, the three to six steel filaments including shaped filaments and twisted together, wherein the shaped filaments are, before twisted together, coiled to be set in a form of coil having a coil diameter of less than 5 mm and a coil pitch of more than 5 mm, the shaped filaments include at least two kinds of shaped filaments which are different in respect of the form of coil, the shaped filaments are twisted together while the coil diameter is reduced, the elongation of the cord at 50 N load is less than 0.2%, and the cord strength is in a range of from 2500 to 3500 N/sq.mm.

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