Patent ID: 7861799

Claim:
An impact tool performing a predetermined hammering operation on a workpiece by a striking movement of a tool bit in an axial direction of the tool bit, comprising: a tool body having a housing space, a lubricant sealed in the housing space, a driving mechanism that is housed within the housing space and drives the tool bit disposed in a tip end region of the tool body in the axial direction, a tool holder that holds the tool bit in such a manner that the tool bit cannot rotate around an axis of the tool bit with respect to the tool holder, the tool holder being disposed in the tool body in such a manner that it can rotate around the axis of the tool bit, and an angular positioning device that is disposed on a tip end side of the tool body and serves to fix a position of the tool bit around the axis with respect to the tool body, wherein the angular positioning device includes: a first locking member that is disposed between the tool body and the tool holder in a direction transverse to the axial direction of the tool bit, and connected to the tool body in such a manner that the first locking member cannot rotate around the axis of the tool bit with respect to the tool body and can rotate around the axis of the tool bit with respect to the tool holder, and a second locking member that is disposed opposite to the first locking member in the axial direction of the tool bit, connected to the tool holder in such a manner that it cannot rotate around the axis of the tool bit while being allowed to move in the axial direction of the tool bit with respect to the tool holder, and can be connected to or disconnected from the first locking member according to the movement of the second locking member in the axial direction of the tool bit, in such a manner that it cannot rotate around the axis of the tool bit with respect to the first locking member, wherein one end of the first locking member in the axial direction of the tool bit extends into the housing space of the tool body and is connected to the tool body within the housing space.