Pneumatic tire having gum strips encasing a carcass turnup

Details Pneumatic tire having gum strips encasing a carcass turnup Pneumatic tire having gum strips encasing a carcass turnup

1987-11-16

1989-06-27

Ball, Michael W.

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

152549, 152552, 152554, 152555, B60C 1500

Patent

active

048420336

ABSTRACT:
A pneumatic tire having gum strips (19,21) for encapsulation of the cut edge of a cord reinforced ply (14), in particular a carcass ply. The gum strips are formed from an elastomeric compound having physical properties such that its 300% Modulus (ASTM D412) is comprised between 5 and 7 MPa and its Shore A Hardness (ASTM D1415) is comprised between 55 and 65. It has been found that such gum strips when used in the bead portion (11) of a tire to encapsulate the ply end (18), improve the durability of the tire.

REFERENCES:
patent: 3392773 (1968-07-01), Warren et al.
patent: 3895666 (1975-07-01), Inoue
patent: 3943798 (1976-04-01), Gardner et al.
patent: 4193437 (1980-03-01), Powell
patent: 4259218 (1981-03-01), Haws
patent: 4502520 (1985-03-01), Sandstrom
patent: 4667722 (1987-05-01), Klepper et al.
Glossary of Terms Relating to Rubber and Rubber Technology (ASTM), Special Tech. Pub. 184A (1972), p. 46.

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