Patent ID: 8316962

Claim:
An impact tool comprising: a tool holder that houses a tool bit that linearly moves in an axial direction of the tool bit, a barrel integrally connected to the tool holder, a striking element housed within the barrel, the striking element performing a linear movement, an intermediate element housed within the barrel, the intermediate element being driven by the striking element and caused to linearly move in the axial direction into contact with the tool bit, thereby transmitting a driving force to the tool bit, the intermediate element coming in point contact with the tool bit on an axial center line of the tool bit, and an elastic element that is disposed between an inner circumferential surface of the tool holder and an outer circumferential surface of the tool bit in an end region of the tool bit on the barrel side, an outer circumferential surface and an inner circumferential surface of the elastic element being connected in close contact with the inner circumferential surface of the tool holder and the outer circumferential surface of the tool bit, respectively, over a predetermined length of the tool bit in the axial direction to apply a biasing force to prevent a run-out of the tool bit in a direction transverse to the axial direction, wherein the elastic element is connected in close contact with the tool bit only partly in a circumferential direction of the tool bit, the elastic element has a ring-like shape, one of the tool bit and the elastic element has a circular section and the other has a polygonal section, at least part of the intermediate element is disposed within the tool holder, a sleeve is disposed between the intermediate element and the tool holder, and an elastic member is disposed along an outer circumferential surface of the sleeve and between the sleeve and the tool holder.