CIRCULAR AIR HAMMER Russian patent published in 1994 - IPC

FIELD: mining industry. SUBSTANCE: circular air hammer has casing-body with chambers of working and idle strokes, core receiver with protrusions, air-distributing tube with recess 8, lower protrusion 9, hammer 10 with outer protrusion 11 and inner lower protrusion 12, upper protrusion 13, bushing 14 with radial channels 15 and 16, shank 17 with longitudinal splines 13, pressing bushing 19, splined coupling 20, axial channel in core receiver 24, inlet holes 25 in air-distributing tube 7, movable seat 26, spring 27, air inlet 28, bushing 29 for attachment of air-distributing tube 7 in casing-body 1, recess 30. EFFECT: higher impact power and drilling efficiency. 1 dwg