Steel cords for the reinforcement of rubber articles and pneumatic tires

(19)

(11)

EP 1 001 074 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	06.09.2000 Bulletin 2000/36

(43)	Date of publication A2:
	17.05.2000 Bulletin 2000/20

(21)	Application number: 99308899.6

(22)	Date of filing: 09.11.1999

(51)	International Patent Classification (IPC)⁷: D07B 1/06

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

13.11.1998 JP 32330598

(71)	Applicant: Bridgestone Corporation
	Tokyo (JP)

(72)	Inventor:
	Yamanaka, Takaya Kodaira City, Tokyo (JP)

(74)	Representative: Whalley, Kevin
	MARKS & CLERK, 57-60 Lincoln's Inn Fields London WC2A 3LS London WC2A 3LS (GB)

(54)	Steel cords for the reinforcement of rubber articles and pneumatic tires

(57) A steel cord for the reinforcement of rubber articles is formed by twisting 4-5 strands, each strand (1) being formed by twisting a sheath (3) of 4-5 steel filaments around a core (2) of a single steel filament, wherein a ratio of diameter d_S of the steel filament constituting the sheath to diameter d_C of the steel filament constituting the core is within a range of 1.00 - 1.75, and a twisting direction of the sheath in the strand is the same as a twisting direction of the strand in the cord, and a twisting angle a of the sheath in the strand with respect to an axis of the cord, as calculated by a certain defined equation, is within a range of 30 - 52°.

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