Tool driving or impacting – Impacting devices – Selective axial direction of impact
Patent
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.
Eley Timothy V.
Fridie Jr. Willmon
Terra AG fuer Tiefbautechnik
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