Patent ID: 6085958
Filing Date: 2000-07-11
Classification: B25C

Abstract:
An explosive powder charge operated bolt-setting tool comprising a barrel which has a barrel-guide bore and a mouth, is guided in a barrel-guiding sleeve and can be brought into operative engagement with a locking part, said barrel-guide bore accommodates a piston provided with a piston shank and piston head, said explosive powder charge operated bolt-setting tool further comprising a rear combustion chamber, a front chamber and a cartridge store, the cartridge store disposed on that side which is remote from the mouth,wherein a rear section of the piston head and the rear combustion chamber are connected through the piston to the front chamber and the piston front section by an axial bore defined in the piston head in such a manner that combustion gases are conducted from the combustion chamber through the axial bore to the front chamber via ventilated openings in a front side of the piston head, and wherein the piston head further comprises an annular spring disposed on an outer periphery of the front section to regulate combustion gases passing from the combustion chamber through the axial bore and ventilated openings to the front chamber and in that the barrel, on its side which faces the cartridge store, has ventilation slots which are released by the piston head as a bolt is being fired, before the piston reaches its end position on the mouth side, in which position a gas cushion is compressed between the piston head and the barrel, said gas cushion subsequently pressing the piston back into a starting position.