Patent ID: 7380612

Claim:
An electric power tool comprising: a housing; a motor; an output shaft which rotates driven by the motor and protrudes so as to move back and forth in the axial direction, the output shaft having an attaching hole for a bit; a percussion mechanism provided in the housing for applying percussion to the output shaft in an axial direction at a backward position of the output shaft; a pressing member provided in the output shaft so as to be movable in the radial direction, and a chuck sleeve provided at an end of the output shaft so as to be movable back and forth in the axial direction with a predetermined stroke as well as biased to one of a forward and a backward positions by a biasing means, and the chuck sleeve presses the pressing member toward a center axis of the output shaft so that the bit inserted into the attaching hole is fixed, wherein the biasing means presses the chuck sleeve so as to be slid backward and at the sliding position the chuck sleeve is caused to abut a side of the housing, resulting in the output shaft being biased to a forward position by the biasing means.