Patent ID: 7021401

Claim:
An electrically powered hammer comprising: a hammer housing a tool holder ( 36 ) located at a forward end of the hammer; a hammering mechanism ( 3 , 5 , 24 ) for generating repeated impacts on at tool or bit mounted in the tool holder; a rotatingly driven intermediate shaft ( 6 ); and a wobble drive arrangement ( 12 , 16 , 18 , 20 ) for reciprocatingly driving the hammering mechanism ( 3 , 5 , 24 ), which wobble drive arrangement includes a wobble sleeve ( 12 ) mounted on the intermediate shaft ( 6 ) and a wobble bearing ( 14 , 16 , 18 ) on the wobble sleeve; characterised in that a support bearing ( 46 , 42 ) for the intermediate shaft is mounted on the wobble sleeve forwardly of the wobble bearing, the support bearing including a bearing ring ( 46 ) and the bearing ring including a flange portion fixed to the hammer housing fixed to a hammer housing ( 10 ).