Electric power tool

An electric power tool comprising:

• a housing;
• a motor;
• a planetary gear reduction mechanism which transmits output of the motor to an output shaft protruding from a front side of the housing and rotates an internal gear;
• a pressing means for pressing and fixing the internal gear;
• an impact mechanism which applies an intermittent impact to the output shaft in a rotative direction;
• a releasing means which selectively releases the impact to the output shaft applied by the impact mechanism;
• a clutch switching member which is slidable between a first sliding position to engage with the internal gear so as to regulate the rotation of the internal gear and a second sliding position to disengage from the internal gear so as to release the regulation of the rotation of the internal gear;
• an impact switching member which is slidable between a first sliding position to release impact by the impact mechanism with the operation of the releasing means and a second sliding position to apply impact by the impact mechanism without the operation of the releasing means, and
• a common switching member which simultaneously engages with both the clutch switching member and the impact switching member to slide them when the common switching member is moved to a predetermined position, whereby combination of the above sliding positions is changeable,
• wherein by moving the common switching member located outside of the housing, one operation mode is selectable among the following:
• an impact mode where impact is applied by the impact mechanism and internal gear rotation is regulated simultaneously;
• a clutch mode where impact by the impact mechanism is released and the regulation of the internal gear rotation is released simultaneously, and
• a drill mode where impact by the impact mechanism is released and the internal gear rotation is regulated simultaneously.