Mounting for rock drills

Details Mounting for rock drills Mounting for rock drills

E - Fixed Constructions

21

C

255/35

E21C 5/11 (1980.01)

Patent

CA 1048487

ABSTRACT OF THE DISCLOSURE A known extendable and retractable mounting for rock drills is described comprising a drill feed leg, a vertical support, which may be mounted on a truck and a counterbalancing device for counterbalancing the drill during movement vertically from one drilling position to another. The new feature described consists in apply- ing a turning Moment to the vertical support by means of a spring, two springs or a fluid cylinder and piston arrangement. The turning moment counteracts a resultant force tending to move the feed leg sideways.

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