Patent ID: 7225545

Claim:
A power tool for driving an eccentrically mounted rotatable working tool, comprising: a housing ( 6 ); a motor ( 8 ) located in the housing ( 8 ); a roller device ( 13 ) supported on the housing ( 6 ) and having at least two roller pairs ( 12 , 16 ) each having a first roller ( 10 , 14 ) and a second roller ( 17 , 19 ) engageable with opposite sides of the working tool ( 4 ), with at least one of the rollers ( 10 , 14 , 17 , 19 ) of at least one roller pair ( 12 , 16 ) being rotatable by the motor for driving the working tool ( 4 ); a pivot device ( 20 ) for pivoting the first rollers ( 10 , 14 ) jointly relative to the second rollers ( 17 , 19 ) between a release position in which the working tool ( 4 ) is brought in or removed from the roller device ( 13 ), and a drive position in which a forcelocking connection between the at least one of the rollers ( 10 ) of the at least one roller pair ( 12 , 16 ) and the working tool ( 4 ) is established, the pivot device ( 20 ) comprising means for preloading the roller pairs ( 12 , 16 ) in the drive position thereof, the preloading means comprising separate spring elements ( 24 a , 24 b ) for preloading the roller pairs ( 12 , 16 ), respectively.