Patent ID: 6199656
Filing Date: 2001-03-13
Classification: E21B,Y10S

Abstract:
A rock drilling rig comprising:a carrier;a boom attached to the carrier for movement relative thereto;a cradle attached to a free end of the boom;a feed beam attached to the cradle for movement relative thereto;a drilling mechanism attached for movement with the feed beam;a casing attached for movement with the feed beam and the drilling mechanism, whereby the casing, the feed beam and the drilling mechanism together constitute a movable unit movable relative to the cradle, the casing extending around and enclosing the feed beam and the drilling mechanism for attenuating noise generated during drilling, the casing being spaced from the feed beam and the drilling equipment, a front end of the casing being opened to enable a front end of the drilling mechanism to project out of the casing, the casing including an opening formed therein rearwardly of the front end for permitting the movable unit to move relative to the cradle.