Patent ID: 8590633

Claim:
A powered hammer and tool comprising: a housing; a tool holder coupled to the housing, the tool holder having a front end and configured to hold a tool; a motor within the housing; a cylinder within the housing; a piston slideably received within the cylinder; a drive mechanism which converts rotary output of the motor into a reciprocating motion of the piston within the cylinder; a ram slideably mounted within the cylinder, forward of the piston, and which is reciprocatingly driven by the piston; a beat piece support structure that supports a beat piece, 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, the beat piece support structure allowing the beat piece to slide between a first forward position and a second rearward position, wherein, when the powered hammer is not in operation, a first end of a tool having indicia located a predetermined distance from the first end can be inserted into the tool holder to slide the beat piece to the second rearward position so that a distance between the front end of the tool holder and the indicia indicates an amount of wear on the beat piece, wherein the indicia comprises a rib formed on the tool and the rib limits insertion of the tool into the tool holder.