PNEUMATIC PERCUSSIVE MACHINE Russian patent published in 1995 - IPC

FIELD: mining industry. SUBSTANCE: pneumatic percussive machine has stem accommodating striker separating stem hollow into working and idle stroke chambers. One of which is communicated by means of idle stroke channel with air distributing mechanism. To increase efficiency of machine, members of control of exhaust mechanism are made in form of two-step valves with sealing and guide steps located in hollows of casings of device to form annular hollows controlling exhaust corresponding to valve steps. Step valves are interconnected by means of stops, and annular hollows controlling exhaust are communicated by means of exhaust holes, command channels and command holes with chambers. EFFECT: higher efficiency. 1 dwg