Explosive powder charge operated setting tool

An explosive powder charge-operated setting tool, comprising a housing (1);

• a guide cylinder (2) displaceable relative to the housing (1) and having an inner bore (25);
• a drive piston (4) displaceably arranged in the inner bore (25) of the guide cylinder (2);
• a control pin (8) projecting from the guide cylinder (2) in a direction opposite to a setting direction;
• a firing pin (16) cooperating with the control pin (8) and having a mating surface (26);
• a spring (18) for biasing the firing pin (16) in the setting direction;
• a release pusher (19) form-lockingly connectable with the firing pin (16) for displacing the mating surface (26) of the firing pin (16) out of an axial projection surface of the control pin (8);
• a trigger (15) for activating the release pusher (19);
• and a backup pin (9) projecting into the inner bore (25) of the guide cylinder (2), with a smallest distance (A3) between the back-up pin (9) and a bottom (28) of the inner bore (25) facing in the setting direction corresponding to a length of the drive piston (4) between an end surface thereof facing in the direction opposite to the setting direction and a stop surface (29) thereof facing in the setting direction and cooperating with the back-up pin (9), and with a smallest distance (A1) between the back-up pin (9) and a free end surface of the control pin (8) plus a clearance (5) between the mating surface (26) of the firing pin (16) and a free end surface of the control pin (8) corresponding to a smallest distance (A2) between the back-up pin (9) and the mating surface (26) of the firing pin (16).