Patent ID: 8181715

Claim:
A power tool comprising: a tool body, an actuating mechanism housed in the tool body, the actuating mechanism linearly driving a tool bit, a dynamic vibration reducer mounted to the tool body, the dynamic vibration reducer reducing vibration caused when the tool bit is driven, wherein the dynamic vibration reducer includes a body, a weight housed within the body to move in a longitudinal direction of the body, and elastic elements respectively connecting the weight to the body, wherein the body includes a plurality of cylindrical members which are coaxially disposed to face each other and the cylindrical members are assembled into the body such that the cylindrical members can move with respect to each other in the longitudinal direction and each elastic element exerts biasing force on the cylindrical members such that the cylindrical members are held apart from each other, and the cylindrical members are fixed to the tool body under the biasing forces of the elastic elements, a venting member mounting part provided on the tool body, a venting member provided on each of the cylindrical members to protrude radially outward from the cylindrical member, each venting member being configured to cause a forced vibration, wherein each venting member is inserted into the venting member mounting part in a direction transverse to the longitudinal direction of the cylindrical member, wherein at least one of the venting members is movable with respect to the cylindrical member in the longitudinal direction of the cylindrical member.