| 摘要 |
A battery-operated driver-drill ( 1 ) includes an epicycle reduction gear unit ( 8 ) which encases a switchover sleeve ( 26 ) having inner teeth ( 27 ) and outer teeth ( 28 ). The gear unit ( 8 ) is rotatably mounted on second and third internal gears ( 19, 20 ) and integrally slidably connected with a slide pate ( 37 ). By operating the slide plate ( 37 ), the switchover sleeve ( 26 ) may be slid between a first position, in which the slide plate ( 37 ) engages one of the second and third internal gears ( 19, 20 ) while engaging axial ridges ( 29 ) of a first gear case ( 5 ), and a second position, in which the slide plate ( 37 ) simultaneously engages both the second internal gear ( 19 ) and a first carrier ( 10 ) adjacent to the second internal gear ( 19 ) while disengaged from the axial ridges ( 2 ).
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