Patent ID: 7921934

Claim:
A power tool comprising: a motor, an internal mechanism driven by the motor, a housing that houses the motor and the internal mechanism, a tool bit disposed in one end of the housing and driven by the internal mechanism in the longitudinal direction of the tool bit to perform a predetermined operation, a handgrip connected to the other end of the housing, and a dynamic vibration reducer including a weight and an elastic element, the elastic element being disposed between the weight and the housing and adapted to apply a biasing force to the weight, wherein the weight reciprocates in the longitudinal direction of the tool bit against the biasing force of the elastic element, whereby the dynamic vibration reducer reduces vibration which is caused in the housing in the longitudinal direction of the tool bit in the working operation, and wherein the dynamic vibration reducer is disposed by utilizing an internal space defined by the housing, wherein the housing includes an inner housing that houses the internal mechanism and an outer housing that houses the inner housing and the motor such that the axial direction of the motor crosses the longitudinal direction of the tool bit, and wherein the dynamic vibration reducer is disposed by utilizing a space existing between an outer wall surface of a side region of the inner housing and an inner wall surface of a side region of the outer housing and a recess formed in the outer wall surface of the inner housing and extending in the longitudinal direction of the tool bit.