Multi-layer steel cable for tire crown reinforcement

Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube

Reexamination Certificate

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Details

C057S213000, C057S902000, C152S451000, C428S295400

Reexamination Certificate

active

06962182

ABSTRACT:
A multi-layer cable having an unsaturated outer layer, usable as a reinforcing element for a crown reinforcement of a tire, comprising a core of diameter d0surrounded by an intermediate layer (C1) of six or seven wires (N=6 or 7) of diameter d1wound together in a helix at a pitch p1, this layer C1itself being surrounded by an outer layer (C2) of P wires of diameter d2wound together in a helix at a pitch p2, P being less by 1 to 3 than the maximum number Pmaxof wires which can be wound in one layer about the layer C1, this cable having the following characteristics (d0, d1, d2, p1and p2in mm):(i) 0.28≦d0<0.50;(ii) 0.25≦d1<0.40;(iii) 0.25≦d2<0.40;(iv) for N=6: l.10<(d0/d1)<1.40;for N=7: 1.40<(d0/d1)<1.70;(v) 5.3π(d0+d1)<p1<p2<4.7π(d0+2d1+d2); and(vi) the wires of layers C1and C2are wound in the same direction of twist.The invention furthermore relates to the articles or semi-finished products made of plastics material and/or rubber which are reinforced by such a multi-layer cable, in particular to radial tires and their crown reinforcement plies.

REFERENCES:
patent: 4781016 (1988-11-01), Sato et al.
patent: 5561974 (1996-10-01), Yamanaka et al.
patent: 5661965 (1997-09-01), Yanagisawa
patent: 5697204 (1997-12-01), Kuriya
patent: 6102095 (2000-08-01), Obana et al.
patent: 2002/0153078 (2002-10-01), Cordonnier et al.
patent: 0 675223 (1995-10-01), None
patent: 0719889 (1996-07-01), None
patent: 0 744490 (1996-11-01), None
patent: WO 98/41682 (1998-09-01), None
patent: WO 0100922 (2001-01-01), None
patent: WO 0149926 (2001-07-01), None
RD 343070; Nov. 1992; pp. 857-859; Research Disclosure.
RD 34054; Aug. 1992; pp. 624-633, Research Disclosure.
RD 316107; Aug. 1990; p. 681; Research Disclosure.

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