Patent ID: 8499850

Claim:
A screwdriving power tool ( 2 ), comprising: a housing ( 4 ); a hollow spindle ( 8 ) rotatably supported in the housing ( 4 ); a motor ( 26 ) for driving the hollow spindle ( 8 ); a clutch ( 30 ) rotationally connecting, in an engagement position thereof, the hollow spindle ( 8 ) with the motor, and rotationally disconnecting the hollow spindle ( 8 ) from the motor ( 26 ) in a disengagement position thereof, the clutch ( 30 ) including clutch spring means ( 40 , 44 ) for preloading the clutch in a disengagement position thereof; a screwing-in spindle ( 6 ) connected, for joint rotation therewith, with a chuck ( 10 ) for receiving a working tool ( 12 ), and connected with the hollow spindle ( 8 ) for a joint rotation therewith and for an axial displacement relative thereto, the clutch ( 30 ) being brought into the engagement position thereof by displacement of the screwing-in spindle ( 6 ) against a biasing force of the clutch springs ( 40 , 44 ); a percussion mechanism ( 14 ) for applying a pulsed axial force to the screwing-in spindle ( 6 ); and means for locking the clutch ( 30 ) in the engagement position thereof, and for retaining the clutch ( 30 ) in a locked condition while applying said pulsed axial force to the screwing-in spindle ( 6 ).