PNEUMATIC HAMMER Russian patent published in 2007 - IPC E21B4/14 

FIELD: fluid operated hammers, particularly used for well drilling in construction and mining industries.

SUBSTANCE: pneumatic hammer comprises piston, which defines working and idle stroke chambers. Air-distribution system member cooperating with channels, which connect working stroke chamber with working fluid source and with atmosphere, is made as valve with separate shutoff tools. The air-distribution system member is arranged in piston pipe located from working stroke chamber side. Channel, which connects working stroke chamber with working fluid source, is made in body. Channel, which communicates above chamber with atmosphere, is made in piston. Valve, which connects idle stroke chamber with working fluid chamber, is arranged in piston pipe and in piston.

EFFECT: improved technological efficiency of air-distribution system arrangement due to decreased number of mating side surfaces of device components.

2 cl, 1 dwg