Internal combustion-powered setting tool

Internal combustion-powered setting device for driving fastening elements such as nails， bolts， pins into a substrate， with a combustion chamber (12) having at least one combustion chamber outlet (13)， in which a fuel gas mixture for driving a drive piston (16) guided in a piston guide (17) can be ignited and with a locking / unlocking device (20) for unlocking the at least one combustion chamber outlet (13) in the starting position (31) of the drive piston (16) and for locking the at least one combustion chamber outlet (13) outside the starting position (31) of the drive piston (16)， wherein the locking / unlocking device (20) has a magnet (21) for detecting the drive piston (16) in the starting position (31)， characterized in that the locking / unlocking device (20) includes a pivotable locking means (22) which interacts with the magnet (21)， the locking means (22) being pivoted in the starting position (31) of the drive piston (16) via the magnet (21) into an unlocking position (23) for the combustion chamber outlet (13) and that when the drive piston (16) is not in its starting position (31)， it is in a locking position (24) for the combustion chamber outlet (13).