Patent ID: 7815088

Claim:
A hand-held drive-in tool for driving fastening elements in a workpiece, comprising a guide ( 12 ); a drive-in ram ( 13 ) displaceable in the guide ( 12 ) for driving a fastening element in; a drive-in unit ( 30 ) for driving the drive-in ram ( 13 ) and including at least one first drive spring ( 31 ) and at least one second drive spring ( 32 ) simultaneously expandable, respectively, in a first expansion direction ( 37 ) and a second expansion direction ( 36 ) opposite the first expansion direction ( 37 ) for driving the drive-in ram in an operational direction of the drive-in ram ( 13 ) in which the drive-in ram ( 13 ) drives the fastening element in; and a tensioning device for preloading the first drive spring ( 31 ) and the second drive spring ( 32 ) of the drive unit ( 30 ).