Electric power tool having speed reduction mechanism

Details Electric power tool having speed reduction mechanism Electric power tool having speed reduction mechanism

2009-03-24

2011-12-27

Nash, Brian D (Department: 3721)

Tool driving or impacting

Means to drive tool about an axis

Electric motor

C173S216000, C173S176000, C173S179000

Reexamination Certificate

active

08083007

ABSTRACT:
An electric power tool includes a motor, a speed reducer unit arranged to deliver the rotational power of the motor and provided with gears, a housing arranged to accommodate the motor and the speed reducer unit, and a speed changing unit for changing a gear reduction ratio of the speed reducer unit. The speed changing unit is arranged in such a position as to be operable outside the housing. The speed changing unit includes an operation lever slidingly operable in a speed changing direction when pushed, an operation detector unit for detecting the operation lever to control electric power supplied to the motor, a shift unit for changing the gear reduction ratio of the speed reducer unit in response to sliding movement of the operation lever, and a slide restraint unit for restraining the sliding operation of the operation lever until the operation detector unit detects the operation lever.

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The Japanese Office Action dated Dec. 15, 2009 and English summary thereof.

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