Setting tool

A setting tool, comprising a sleeve-shaped housing (11);

• a piston guide (13);
• a piston (15) displaceable in the piston guide (13);
• an ignition unit (12) located in the housing (11) and axially displaceable therein;
• a cartridge chamber (18) arranged between the piston guide (13) and the ignition unit (12), the ignition unit (12) having a cartridge chamber bottom (19) for enclosing a propellant (25) in the cartridge chamber (18) and an ignition element (22) for igniting the propellant (25);
• and a locking device (30) having a locking position (38) in which the ignition unit (12) is held in a pre-loaded position (28) against an energy accumulator (23) and in which the cartridge chamber (18) remains open, and having a release position (39) in which the ignition unit (12) is displaced to an ignition position (29) thereof by the energy accumulator in which the cartridge chamber bottom (19) closes the cartridge chamber (18).