Hammer
AssigneeBlack & Decker Inc.
InventorAchim Buchholz
Life of this patent
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Abstract
An electrically powered hammer comprises a housing, a spindle, a piston reciprocatingly mounted within the spindle, a wobble drive arrangement reciprocatingly connected to the piston, and a trunnion arrangement including a cross bolt is driving engaged between the wobble drive arrangement and the piston. The piston includes a pair of piston arms and a protrusion so that the first piston arm and the protrusion define a first recess and the second piston arm and the protrusion define a second recess, and each of the recesses is shaped so as to support a wear reducing washer in an assembled position. When assembled, each washer fits around the cross bolt in a region adjacent the inwardly facing face of the associated piston arm so as to reduce wear between the cross bolt and the piston arms.
Claims10
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.
Dependencies are inferred from the claim text.