Rock drilling rigs

Details Rock drilling rigs Rock drilling rigs

E - Fixed Constructions

21

C

255/37

E21C 5/11 (1980.01)

Patent

CA 1067482

A B S T R A C T A mounting for a rock drilling machine comprising a drill feed leg composed of a fluid operated piston and cylinder; a support mounted for rotation about an axis, an adjustable counterbalancing arm with the cylinder of the feed leg, the support and the coun- terbalancing arm forming a triangle which can swing about an axis parallel to the support and which controls the elevation of the feed leg and with the piston of the feed leg extending beyond the triangle; a mount for a drilling machine carried by the piston; and an auxiliary beam attached to the front end of the piston and able to telescope into a structure that is fixed with respect to the cylinder so that it reinforces the piston.

274076

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