AIR-OPERATED PERCUSSION MACHINE Russian patent published in 2003 - IPC

FIELD: mining industry, civil engineering. SUBSTANCE: air-operated percussion machine has shaft, striker placed in space of shaft, chambers of power and no-load strokes of striker, tubular valve, cover, sleeve attached to shaft in which space mechanism controlling exhaust of compressed air from chambers of shaft into atmosphere is located. This mechanism includes ring valve, seat with exhaust holes and mobile rests. Shaft of machine includes exhaust holes and command ducts. Air distribution mechanism is provided with additional spaces housing stepped control valve and check valve presenting, for instance, spring-loaded ball, circular groove in cover of air distribution mechanism. Part of space under stepped control valve communicates with space of handle where air distribution mechanism and chamber of power stroke are positioned and part of space above stepped control valve communicates with chambers of power and no-load strokes of striker. Ring valves of mechanism controlling exhaust are mounted for interaction with mobile rests preventing their angular displacement and are provided with exhaust holes. EFFECT: enhanced efficiency of machine, reduced aerodynamic noise. 1 cl, 4 dwg