Patent ID: 7252157

Claim:
A power tool, comprising: a tool bit; a tool body to which the tool bit is coupled; an actuating mechanism disposed in the tool body to drive the tool bit linearly by means of pressure fluctuations so as to cause the tool bit to perform a predetermined operation, wherein the actuating mechanism has a driving motor, a motion converting mechanism that converts a rotating output of the driving motor to a linear motion, a piston linearly reciprocating in a longitudinal direction of the tool bit via the motion converting mechanism, a striker disposed in front of the piston to cause the tool bit a linear motion, a first chamber between the striker and the piston, and a second chamber disposed adjacent to the piston within the tool body in an side of the first chamber; and a dynamic vibration reducer having a weight that reciprocates under a biasing force of an elastic element to reduce vibration of the actuating mechanism, the weight being driven by means of pressure fluctuations caused in the second chamber when the piston reciprocates, wherein the motion converting mechanism comprises a crank mechanism that drives the striker by converting a rotating output of the driving motor to a linear motion in an axial direction of the tool bit, and the second chamber is defined by a crank chamber that houses the crank mechanism.