PERFORATOR WITH CONTROLLED TORQUE Russian patent published in 2003 - IPC

FIELD: percussive-rotary drilling machines; applicable in breakage of rocks or other materials in underground mines, opencasts and in construction jobs. SUBSTANCE: perforator includes body with striker, distributor, rotating mechanism of drill rod with spindle, axle-box for rotation of drill rod. Spindle part facing axle-box presents a gear. Control device is located between axle-box and spindle and consists of ring gear and idle gear with axles being in constant mesh with one another, axle box and spindle gear, ring piston and control channels for alternate connection with pressure main line or atmosphere. Ring piston has holes receiving axles of idle gears. Piston is capable of axial motion and rotation relative to body. Piston both ends have end cams for alternate coupling with companion cams of ring gear or body. EFFECT: provided increase of torque for drilling of unstable and fissures intervals of blasthole or hole due to improved design of perforator. 3 dwg