PNEUMATIC IMPACT DEVICE Russian patent published in 2000 - IPC

FIELD: mining industry and civil engineering; impact device for driving pipes and other rod members into ground. SUBSTANCE: in proposed pneumatic impact device value of parasitic volumes in air distributing system is reduced. Device has impact unit with housing accommodating striker dividing housing space into working and idling chambers, master spool air distributor brought out beyond the limits of impact unit and connected with impact unit by at least one communication channels, and supply main line. According to invention, impact unit has slave spool connected with at least one communication channel of brought out master spool air distributor. EFFECT: increased economy in operation. 1 dwg