PERCUSSION DEVICE Russian patent published in 2012 - IPC E21C37/00 

FIELD: mining.

SUBSTANCE: device includes a striker made in the form of two-stage cylinder in coaxial bore of larger stage of which there arranged is fixed stock with a piston, which is rigidly fixed in upper blind cover of pipe and forming together with striker a hydraulic cylinder the piston cavity of which is constantly interconnected through one channel in the stock with drain line, and stock cavity of hydraulic cylinder is interconnected from time to time via another channel in the stock through a working valve to pressure line of hydraulic system or to piston cavity. Leak-proof cavity between upper edge of the striker and the above blind cover of the pipe is constantly interconnected through radial holes in side pipe wall with insulated annular cavity of the specified volume, which envelopes the pipe. On inner side surface of upper chamber of tip there formed is annular projection which is equipped on side surface with annular groove with through radial holes, which mates the side surface of medium stage on lower pipe end near extreme lower position of the tip, thus isolating lower chamber of tip from inner cavity of the latter. Reliability and efficiency of the device is improved at simultaneous reduction of the weight and sizes of hammer.

EFFECT: working conditions and safety is improved.

2 cl, 3 dwg