| 摘要 |
<p>In a setting tool using explosive caseless propellant charges for driving fastening elements into a hard target material, a combustion chamber for the charges is located rearwardly of the rear end of the bore in the setting tool through which a drive piston is displaceable for inserting the fastening elements. The combustion chamber is in communication with the rear end of the bore through at least one Laval nozzle. A mixing chamber can be located between the combustion chamber and the rear end of the bore with constant cross section flow channels located between the combustion chamber and the mixing chamber and with the Laval nozzle extending between the mixing chamber and the rear end of the bore. The rear end of the drive piston can be selectively positioned relative to the rear end of the bore so that a working chamber of variable dimension in the axial direction of the bore is provided between the rear end of the piston and the rear end of the bore.</p> |
