Patent ID: 9321163
Filing Date: 2016-04-26
CPC Classification: B25D

Claim Text:
1. An impact tool which is configured to perform a predetermined operation on a workpiece by striking movement of a tool bit in an axial direction of the tool bit, comprising: a motor, a swinging member that is driven by the motor and swings in the axial direction of the tool bit, a striking mechanism that is driven linearly in the axial direction of the tool bit by the swinging motion of the swinging member, a connecting part that connects the swinging member and the striking mechanism, a housing member that houses at least the connecting part in an internal space, a counter weight that is disposed within the internal space of the housing member and reduces vibration caused when the tool bit is driven, and an outer housing that is disposed outside the housing member and houses an entirety of the housing member, wherein the counter weight has a close ring shape, and has a first annular part and a second annular part connected in a vertical direction, the first annular part being located above the second annular part in the vertical direction, the counter weight is rotatably supported by the housing member at a position above The first annular part in the vertical direction, and an entirety of the first annular part is the enclosed by the housing member.