Hammer

Details Hammer Hammer

2005-12-27

2005-12-27

Smith, Scott A. (Department: 3721)

Tool driving or impacting

Impacting devices

With means for rotating tool

C173S201000

Reexamination Certificate

active

06978847

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.

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