Patent ID: 6978847
Filing Date: 2005-12-27
Classification: B25D

Abstract:
1. A powered hammer comprising: a hammer housing; a hollow spindle located in the housing; a hammering mechanism including a piston reciprocatingly mounted within the spindle; the piston including at least one rearwardly extending piston arm and a rearward protrusion, the piston arm and the protrusion defining a recess between the piston arm and the protrusion; a wobble drive arrangement drivingly connected to the piston; a trunnion arrangement drivingly connected between the piston and the wobble drive arrangement, the trunnion arrangement including a cross bolt and at least one washer, the washer at least partly located within the recess, and the cross bolt rotatably connected to the piston arm; and wherein the recess is shaped so as to support the washer in an assembled position.