Bridgestone Corporation

Max Co., Ltd.

Mitsubishi Heavy Industries Thermal Systems, Ltd.

Yasuhiro Naito

Hajime Takemura

Michiaki Adachi

Tatsushi Ogawa

Hironori Mori

Mitsugu Takezaki

Makoto Kosuge

Yasunori Aihara

Keizo Akutagawa

Nobuo Kishi

Ken Yamaguchi

Kunihiro Higashiura

A center rib and a second rib are formed at a tread surface of a pneumatic tire along an outer contour line L of a radius R whose center is at a tire inner side. A shoulder rib is formed at the tread surface along an outer contour line L of a radius R whose centeris at a tire inner side. A step between the outer contour line L and a ground contact surface of the shoulder rib decreases toward a tire transverse direction outer end portion. Accordingly, when a heavy load is applied to the pneumatic tire, due to the step between, on the one hand, the shoulder rib, and on the other hand, the center rib and the second rib, uneven wear at the second rib can be suppressed. When a light load is applied, because the step decreases toward the tire transverse direction outer end portion, uneven wear of the shoulder rib can be suppressed. The pneumatic tire exhibits excellent uneven wear resistance at all land portions formed on the pneumatic tire.

Pneumatic tire including land portion having arcuate and convex tread surface

An air supply and exhaust system comprising a pneumatic tool, an air supply source, an exhaust apparatus, and at least one double-pipeline air hose. The exhaust apparatus includes a filter through which exhaust from the pneumatic tool passes and is provided apart from the pneumatic tool. The double-pipeline air hose includes two pipelines and connects the pneumatic tool and the air supply source, wherein one of the pipeline is for air supply to the pneumatic tool and the other of pipeline is for exhaust from the pneumatic tool.

Air supply and exhaust system for pneumatic tool

This invention relates to a pneumatic tire coated with a water-based electrically conductive coating, in which the coating contains a carbon black having a nitrogen adsorption specific surface area (N.sub.2 SA) of 70 m.sup.2 /g-180 m.sup.2 /g and a dibutyl phtalate (DBP) absorption of 70 ml/100 g-180 ml/100 g, a surface active agent and a rubber ingredient.

Pneumatic tire provided with electrically conductive coating

An exhaust mechanism of a pneumatic nailing in which a striking cylinder is accommodated in a body and a striking piston in the striking cylinder is driven to drive a nail when compressed air is supplied to and exhausted from an upper portion of the striking cylinder, comprises: an inner cap arranged in the upper portion of the striking cylinder; a cylinder cap covering the inner cap; an exhaust chamber formed along inside the body between the inner cap and the cylinder cap; and a throttle hole formed in a lower portion of the exhaust chamber, wherein the exhaust air exhausted from the upper portion of the striking cylinder is discharged from the throttle hole via the exhaust chamber.

Exhaust mechanism of pneumatic nailing machine

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Tokyo, Japan

Yasuhiro Naito