Percussion drill

Details Percussion drill Percussion drill

1989-12-29

1991-09-24

Eley, Timothy V.

Tool driving or impacting

Impacting devices

Selective axial direction of impact

175 19, B25D 900

Patent

active

050506862

ABSTRACT:
A percussion drill having a control device for controlling its travel forwards and/or backwards is provided with an adjusting and locking device for an axially movable control sleeve (4), this adjustment reversal device being adapted to be controllably operated with compressed air from a control station. A reliable reversal from forward to backward travel of the percussion drill is thus possible even in very long boreholes and even in the event of the collapse of the borehole.

REFERENCES:
patent: 4683960 (1987-08-01), Kostylew et al.
patent: 4708211 (1987-11-01), Shenyakin et al.

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