FIELD: sinking boreholes. SUBSTANCE: pneumatic reversible percussion device for sinking boreholes has hollow case, striker with an aperture and a cavity, stepped pipe branch, rotary stepped sleeve with an aperture, accessory for stopping sleeve rotation, elastic member and a nut with air inlet hose. The accessory for stopping sleeve rotation is placed on back end surface of the pipe branch. EFFECT: high productivity. 18 cl, 18 dwg
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| PNEUMATIC REVERSIBLE PERCUSSIVE DEVICE FOR DRIVING HOLES IN EARTH | 0 |
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SU1313973A1 |
