Patent ID: 7121360

Claim:
A hand-held power tool comprising a housing ( 2 ); a percussion mechanism ( 3 ) arranged in the housing ( 2 ); a motor ( 4 ); and a gear unit ( 5 ) for drivingly connecting the motor ( 4 ) with the percussion mechanism ( 3 ), wherein the percussion mechanism ( 3 ) includes an eccentric ( 6 ), a piston ( 7 ), and a connection rod ( 21 ; 412 ) for connecting the eccentric with the piston ( 7 ), the connection rod ( 21 ; 41 ) having a first part ( 22 ; 42 ) connectable with the eccentric ( 6 ), a second part ( 23 ; 43 ) connectable with the piston ( 7 ) and telescopically displaceable relative to the first part ( 22 ; 42 ), and a spring for damping vibrations occurring during operation of the power tool and arranged between the first ( 22 ; 42 ) and second ( 23 ; 43 ) parts, wherein one of the first ( 22 , 42 ) and second ( 23 ; 43 ) parts of the connection rod ( 21 ) has at least one guide groove ( 3 ), and another of the first ( 22 ; 42 ) and second ( 23 ; 43 ) parts of the connection rod ( 21 ) has at least one projection cooperating with the guide groove ( 33 ) for preventing disengagement of the first ( 22 ; 42 ) and second ( 23 ; 43 ) parts from each other.