Patent ID: 7997837

Claim:
A power tool comprising: a tool body, a single holder mounting portion disposed in the tip end region of the tool body, the holder mounting portion removably holding a bit holder that is selected from multiple kinds of bit holders which hold multiple kinds of tool bits in different manners, the holder mounting portion holding the selected bit holder by replacing an other bit holder attached to the holder mounting portion, a recess formed in an outer surface of the holder mounting portion, wherein each bit holder comprises: a cylindrical portion having a fitting hole that is fitted on the holder mounting portion and can be pulled out, a through hole formed through the cylindrical portion such that one end of the through hole is open to an outer surface of the cylindrical portion and the other end is open to the fitting hole, and an engaging member that is disposed within the through hole and that moves between a locked position and a lock released position, wherein, in the locked position, the engaging member protrudes from the one open end of the through hole on the fitting hole side and engages with the recess of the holder mounting portion fitted in the fitting hole, so that the holder mounting portion is prevented from being pulled out of the fitting hole, while, in the lock released position, the engaging member protrudes from the other open end of the through hole on the outer surface side and is disengaged from the recess, so that the holder mounting portion is allowed to be pulled out of the fitting hole, a cylindrical operating member that is axially movably fitted on the cylindrical portion and has a movement control region that prevents the engaging member from moving from the locked position to the lock released position, the operating member being moved between a movement prevented position in which the movement control region engages with the engaging member and prevents movement of the engaging member and a movement allowed position in which the movement control region is disengaged from the engaging member and allows movement of the member member, and a biasing member that applies a biasing force to the operating member to normally hold the operating member in the movement prevented position, wherein the operating member is moved to the tool body side in order to be switched from the movement prevented position to the movement allowed position so that the holder mounting portion is allowed to be pulled out of the fitting hole, and the operating member is connected to the cylindrical portion when the holder mounting portion is detached upon disengagement.