Aichi Toyota Jidosha Kabushikikaisha

Hiromi Hasuo

Kunio Suzuki

Sakichi Minoura

An impact wrench having an improved air regulator comprises a cylindrical pipe provided on a handle, an air supply valve movably inserted in a back section of the cylindrical pipe, and a changeover valve movably inserted in a front section of the cylindrical pipe. The cylindrical pipe has a first air supply inlet and a second air supply inlet. The air supply valve has several air supply regulating slots of different diameters. The changeover valve has an an air supply reversing slot. The desired one of the air supply regulating slots is adapted to communicate with the first air supply inlet, so that the air flow to the air motor is regulated in the cylindrical pipe, thus obtaing a desired torque. The air supply reversing slot is adapted to communicate with the second air supply inlet only when the air motor is rotated counterclockwise. A compressed air is introduced into the air motor via the second air supply inlet, as well as the first air supply inlet communicating with the desired one of the air supply regulating slots. A more compressed air is supplied to the air motor when the air motor is rotated counterclockwise to produce an unfastening torque than when the air motor is rotated clockwise to produce a fasteing torgue.

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Osaka, Japan

Hiromi Hasuo