Patent ID: 7077217

Claim:
A piston for a hammering mechanism of a powered hammer including a hollow spindle, a trunnion cross bolt, and at least one washer defining a central hole, the piston comprising: a cylindrically shaped piston body, slideably mountable within the hollow spindle, and including a rearward end; at least one piston arm extending rearwardly from the rearward end of the piston body, the piston arm defining a through hole within which the trunnion cross bolt is mountable; a protrusion located on the rearward end of the piston body, the piston arm and the protrusion defining a recess, the recess shaped to support the washer between the protrusion and the piston arm so that the central hole of the washer and the through hole of the piston arm are substantially aligned in preparation for the mounting of the trunnion cross bolt.