Patent ID: 7537146

Claim:
A hand-held drive-in power tool for driving in fastening elements, comprising: a guide ( 12 ); a drive-in ram ( 13 ) displaceable in the guide ( 12 ); drive means ( 30 ) for driving the drive-in ram ( 13 ) and including at least one preloaded drive spring ( 31 ); a tensioning device ( 70 ) including: a motor ( 71 ) for displacing the drive-in ram ( 13 ) in a direction opposite to the drive-in direction ( 27 ) for preloading the drive spring ( 31 ); a transmission mechanism ( 32 ) arranged between the drive spring ( 31 ) and the drive-in ram ( 13 ), wherein an expansion path ( 45 ) of the drive spring ( 31 ) is converted by the transmission mechanism ( 32 ) to cause an acceleration path ( 44 ) of the drive-in ram ( 13 ) to be longer than the expansion path ( 45 ) of the drive spring ( 31 ); and a locking device ( 50 ) for holding the drive-in ram ( 13 ) against the biasing force of the drive spring ( 31 ); wherein the transmission mechanism ( 32 ) is a rope drive.