Bridgestone Tire Company Limited

Hironori Hirano

Akio Sato

Iwao Arimura

Shigeo Makino

Hiroshi Ogawa

Tatsuo Arai

Satoru Aono

Hirozi Yamada

Masayuki Matsui

Hiroyuki Kajimura

A low section profile pneumatic radial tire for heavy vehicles used for recently developed transport facilities such as a trolley bus, mono-rail vehicle, driverless vehicle, sub-way vehicle, etc. is disclosed. The low section profile pneumatic radial tire for heavy vehicles is constructed to satisfy the following three conditions, i.e.

Low section profile pneumatic radial tire for heavy vehicles

A pneumatic radial tire so constructed as to reduce a breaker interlayer shearing strain without adding any particular supplemental reinforcing layer is disclosed. The radial tire has an initial sectional shape which satisfies the following conditions.

Pneumatic radial tires

A testing machine for a tire on an imitation road in which a tire to be tested is urged against a crawler with the aid of a cantilever arm connected through a crosshead to a lifting and lowering disc engaged with screw threaded rods rotatably mounted in a machine frame. The crawler is composed of an endless chain and a road surface forming rods detachably mounted on the endless chain and replaceable by new rods made of different kind of material. In the crosshead are incorporated slip and camber angle setting mechanisms. Provision is made of load cells such as a strain gauge operatively connected to a tire supporting shaft, driving and driven shafts of the crawler and a guide rail of the crawler and for detecting a vertical load subjected to the tire, a torque for driving the crawler under various load conditions and a transverse component of force subjected to the crawler when the tire having a given slip angle or a camber angle is urged against the crawler.

Testing machine for tires on imitation roads

A pneumatic radial type tire having an improved durability in bead section comprises at least one carcass ply composed of metal cords in a substantially radial arrangement, at least one chafer composed of rubberized metal cords, a carcass reinforcing member secured to the surface of the carcass ply and composed of at least two rubberized cord fabrics whose cords are crossed with each other at an angle larger than 60.degree. with respect to the cord direction of the carcass ply, and a rubber stiffener composed of a composite rubber stock having a hardness which is made smaller at the upper part than at the lower part thereof.

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Akigawa, Japan

Hironori Hirano