Panasonic Electric Works Co., Ltd.

Kunihiko Tatsu

Koichi Hashimoto

Hiroyuki Tsubakimoto

Hidekazu Yuasa

Hisashi Oda

A hammer drill includes a motor; a spindle rotatingly driven by the motor and holding an output bit; a motion conversion member for converting rotational movement of the motor to reciprocating movement; a striker reciprocatingly driven by the motion conversion member for applying an axial striking force to the output bit; a striking-motion-releasing mechanism for releasing the striking force applying action exercised by the striker; and a tightening-torque adjusting clutch for interrupting the transfer of the rotational force to the output bit by increasing a load torque.

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Osaka, Japan

Kunihiko Tatsu