HAMMER WITH PNEUMATIC DRIVE OF THE TYPE 'FOND-DE-TROU'

摘要

PNEUMATIC PERFORATION HAMMER, OF THE "BOTTOM-OF-HOLE" TYPE, COMPRISING A TUBULAR BODY 1 SUPPLIED WITH COMPRESSED AIR AND A STRIKING PISTON 21 IN ALTERNATIVE MOVEMENT IN A SHIRT 7 UNDER THE EFFECT OF A COMPRESSED AIR DISTRIBUTION, FOR COME CYLINDRICALLY HIT THE SIZE 3. /P P THE HAMMER COMPRISES TWO SEPARATE SUPPLIES 16, 18 IN RESPECTIVELY HIGH AND LOW PRESSURE COMPRESSED AIR. HIGH PRESSURE AIR IS ONLY USED IN CHAMBER 51 TO PROJECT THE PISTON 21 TOWARDS THE SIZE; LOW PRESSURE AIR IS ONLY USED IN CHAMBER 50 TO REASSEMBLE PISTON 21.