Patent ID: 7712547

Claim:
An electric hammer comprising: an electric hammer body, a hammer bit that is coupled to the body and performs a hammering operation in contact with a workpiece, a driving motor that is housed within the body, a striker that is housed within the body and driven by the driving motor to apply a striking force to the hammer bit, a vibration reducing mechanism that is linearly driven in an axial direction of the hammer bit and generates vibration, thereby reducing vibration caused in the body, and a controller that is configured to change an amount of drive to be provided for the vibration reducing mechanism between a first mode and a second mode, wherein: in the first mode, under loaded driving conditions in which a load acts on the hammer bit from the workpiece side by the hammering operation, the vibration reducing mechanism optimizes vibration reduction by generating vibration corresponding to vibration caused in the body, and in the second mode, under unloaded driving conditions in which the driving motor is energized while the hammering operation is not performed so that no load acts on the hammer bit from the workpiece side, the vibration reducing mechanism optimizes vibration reduction by generating vibration corresponding to vibration caused in the body.