| 摘要 |
An impact driver capable of boring and having an excellent usability is provided. An anvil( 8 ) is arranged so as to slightly move in the axial direction. A first cam( 29 ) having cam gears( 30, 30 . . . ) is externally provided at the anvil so as to be integral with the anvil( 8 ). At the rear of the first cam( 29 ), a second cam( 31 ) having cam gears( 32, 32 . . . ) and further having cam gears( 36, 36 . . . ) at its outer circumference is externally provided to the anvil( 8 ) so as to be rotatable. At the backward position of the anvil( 8 ), the cam gears( 30, 32 ) contacts with each other. On the other hand, in the cylindrical portion( 27 ) of the hammer case( 5 ), an engaging pin( 37 ) capable of engaging with an engaging gear( 36 ) of the second cam( 31 ) is provided. The engaging pin( 37 ) can change its location by the rotative operation of a mode-change ring( 40 ), whereby a percussion mode and a non-percussion mode is selected.
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