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Electric power tool

  • US 20090160371A1
  • Filed: 12/24/2008
  • Published: 06/25/2009
  • Est. Priority Date: 12/25/2007
  • Status: Active Grant
First Claim
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1. An electric power tool comprising:

  • a motor as a driving power source;

    a reduction mechanism for transferring the rotating power of the motor, the reduction mechanism having two or more gear stages;

    a driving unit for transferring the rotating power of the reduction mechanism to a tip end tool;

    a bearing unit for rotatably supporting the driving unit;

    a housing for accommodating the motor, the reduction mechanism, the driving unit and the bearing unit within a main body portion thereof, the housing provided with a handle portion;

    a speed changing unit for changing a reduction ratio of the reduction mechanism, the speed changing unit being arranged in such a position as to allow an operator to operate the same from the outside of the housing;

    a power switch for turning on and off a power source of the motor; and

    an operation detecting unit for detecting a reduction ratio changing operation performed by the speed changing unit to control the electric power supplied to the motor.

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