Drilling device for a rock drill

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

1993-08-31

1995-05-16

Smith, Scott A.

Tool driving or impacting

Drive adjustable to completely change kind of drive

Adjustable to impacting device

173105, 173206, B25D 920

Patent

active

054152402

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.

REFERENCES:
patent: 1372915 (1921-03-01), Smith
patent: 1658330 (1928-02-01), Gilman
patent: 3044448 (1962-07-01), Curtis et al.
patent: 3307638 (1967-03-01), Kurt
patent: 3403738 (1968-10-01), Burkhart et al.
patent: 4006783 (1977-02-01), Granholm
patent: 5060734 (1991-10-01), Anderson et al.
patent: 5064003 (1991-11-01), Nerozhikov et al.

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