Patent ID: 7624815

Claim:
A powered hammer comprising: a housing; a tool holder coupled to the housing and configured to hold a tool; a motor within the housing; a piston slideably mounted within the housing; a drive mechanism that converts rotary output of the motor into a reciprocating motion of the piston; a ram slideably mounted within the housing, forward of the piston, and which is reciprocatingly driven by the piston; a beat piece slideably mounted forward of the ram, the beat piece being repetitively struck by the reciprocating ram and which in turn repetitively strikes an end of the tool when held in the tool holder to transfer the momentum of the ram to the tool; and a vibration dampener including a counter mass comprising a magnetic material and slideably coupled to the housing; and a biasing mechanism that biases the counter mass to a predetermined position, wherein, when the motor is operated, the counter mass oscillates to counteract vibration generated by movement of at least one of the piston, the ram, and the beat piece; and wherein the magnetic material of the counter mass removes metal splinters from lubricating fluid.