Drilling device for a rock drill

Details Drilling device for a rock drill Drilling device for a rock drill

E - Fixed Constructions

21

B

E21B 6/00 (2006.01) B25D 9/12 (2006.01) B25D 9/22 (2006.01) B25D 16/00 (2006.01) E21C 3/04 (1990.01)

Patent

CA 2104705

The invention concerns a rock drill (2) for activating a rotatable and reciprocable drill steel assembly (Fig. 1). A reversible motor (50) is coupled to a striking bar (3) for rotating the drill steel. The striking bar is struck by a percussion piston (10). A rotary fluid valve (15) is operat- ing the piston. A disconnectable coupling (37,38,43) in nor- mal operation couples both the valve (15) and the striking bar (3) with the motor (50). In special modes the motor operates only the percussion piston, e.g. for retracting a drill rod, or only rotates the striking bar (3), e.g. for connecting and disconnecting drill rods.

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