PNEUMATIC HAMMER Russian patent published in 2003 - IPC

FIELD: mining industry, particularly, pneumatic hammers for breakage, for instance, solid rocks; applicable in development of percussive pneumatic machines. SUBSTANCE: pneumatic hammer has handle, body with central channel, silencer case forming circular flow-through preliminary expansion chamber together with body, striker, chambers of working and idle strokes, through exhaust channels in body, cap, flow-through circular discharge chamber with discharge channels with skew cuts at their inlet and outlet, circular bushings with through recesses forming opposite-twisting countercurrents, working tool. Flow-through circular discharge chamber is formed coaxially between silencer case and cap, whose internal surface carries installed packing sleeves forming between themselves mixing chamber with discharge channels. Formed on opposite sides of packing sleeves are supercharger chambers communicated with circular flow-through preliminary expansion chamber. EFFECT: higher efficiency of noise suppression. 5 cl, 2 dwg