Pneumatic radial tires

Details Pneumatic radial tires Pneumatic radial tires

1983-05-25

1984-12-18

Boland, Lois E.

Resilient tires and wheels

Tires, resilient

Patches

152361R, 57902, 57213, 57230, B60C 908, B60C 920, D02G 336

Patent

active

044885873

ABSTRACT:
A pneumatic radial tire having an improved durable life is disclosed. In the pneumatic radial tire, a metal cord used in the carcass ply is characterized by having a layer construction of 3+9+1 wherein three filaments are twisted together to form a core, nine filaments each having the same diameter as in the filament for the core are twisted around the core to form a second layer and a single filament is wrapped around the second layer, and limiting a twisting angle .alpha. of the second layer to a range of 72.0.degree..ltoreq..alpha..ltoreq.78.0.degree..

REFERENCES:
patent: 416189 (1889-12-01), Stone
patent: 4158946 (1979-06-01), Bourgois
patent: 4258543 (1981-03-01), Canevari et al.
patent: 4332131 (1982-06-01), Palsky et al.
patent: 4333306 (1982-06-01), Yamashita et al.
patent: 4349063 (1982-09-01), Kikuchi et al.
patent: 4399853 (1983-08-01), Morimoto et al.
"Rubber Articles Reinforced with High Tensile Steel Lord", Research Disclosure (#18441), (8-1979).

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