Drilling device for a rock drill
AssigneeSIG Schweizerische Industrie-Gesellschaft
InventorMarjan Mundjar
Life of this patent
Estimating the term…
Abstract
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 operating the piston. A disconnectable coupling (37,38,43) in normal 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.
Claims13
A drilling device for a drill steel, comprising:
- a housing (2);
- a striking bar (3) for holding a rear end of said drill steel, said striking bar being supported in said housing (2) for rotation around an axis of said striking bar and for reciprocal movement along said axis;
- a reversible first fluid motor (50, 60) having an output shaft (49, 62) coupled to said striking bar (3) for rotating said striking bar;
- a percussion piston (10) for striking said striking bar (3), said piston being reciprocatingly received in a cylinder (14);
- and
- a fluid valve (15) connected to said cylinder (14) for reciprocating said piston (10) by periodic pressure changes;
- and
- a disconnectable first mechanical coupling (37, 38) between said output shaft (49, 62) and said fluid valve (15) for coupling a valve member of said fluid valve (15) with said output shaft.
A drilling device for a drill steel, comprising:
- a housing (2);
- a striking bar (3) for holding a rear end of said drill steel, said striking bar being supported in said housing for rotation around a striking bar axis and for reciprocal movement along said axis;
- a reversible first fluid motor (50, 60) having a first output shaft (49, 62);
- a percussion piston (10) for striking said bar (3), said piston being reciprocatingly received in a cylinder (14) of said housing;
- a fluid valve (15) connected to said cylinder (14) for controlling periodic pressure changes within said cylinder to reciprocate said piston;
- a fixed-ratio transmission (38, 43;
- 38, 37) connecting said first output shaft (49, 62) to said striking bar to rotate said striking bar and connecting said first output shaft (49, 62) to said fluid valve (15) for controlling a reciprocation frequency of said percussion piston, said transmission being selectively engageable;
- and
- means for selectively engaging said transmission.
A drilling device for a drill steel, comprising:
- a housing (2);
- a striking bar (3) for holding a rear end of said drill steel, said striking bar being supported in said housing (2) for rotation around its axis and for reciprocal movement along its axis;
- a reversible first fluid motor (60) with an output shaft (62) coupled to said striking bar (3) for rotating said striking bar;
- a percussion piston (10) for striking said striking bar (3) and reciprocatingly received in a cylinder (14);
- a fluid valve (15) connected to said cylinder (14) for reciprocating said piston (10);
- and
- a disconnectable first coupling (37,38) between said output shaft (62) and said fluid valve (15);
- further comprising a second fluid motor (50) coupled to said fluid valve (15).
Dependencies are inferred from the claim text.