Patent ID: 7832498

Claim:
An impact tool which performs a predetermined hammering operation on a workpiece by a striking movement of a tool bit in its axial direction, comprising: a tool body, a cylinder housed within the tool body, a dynamic vibration reducer having a weight that linearly moves under a biasing force of an elastic element, wherein the dynamic vibration reducer reduces vibration of the tool body during hammering operation by the movement of the weight in the axial direction of the tool bit, and a mechanical vibration mechanism that actively drives the weight by applying external force other than vibration of the tool body to the weight via the elastic element, wherein: the weight and the elastic element are disposed on the axis of the tool bit and between an inner wall surface of the tool body and an outer wall surface of the cylinder in such a manner as to cover at least part of the outer wall surface of the cylinder in the circumferential direction, and the mechanical vibration mechanism includes a sliding element that linearly moves in the axial direction of the tool bit in such a manner as to apply an external force to the elastic element.