Patent ID: 8393790
Filing Date: 2013-03-12
Classification: E21B

Abstract:
1. Elongated rock drill rig feed feed beam ( 4 ), the feed beam comprises a profiled box beam of a light metal or a light metal alloy made from a hollow extruded profile with a substantially rectangular cross section with an upper wall, a lower wall and two side walls, the upper, lower and side walls of the feed beam having substantially planar outer surfaces, the feed beam including at least two pair of external individual guide beads ( 8 , 9 ), wherein one of said two pair of external guide beads ( 8 ) guiding movement of a rock drilling machine ( 5 ) or a sled ( 15 ) on which a drilling machine is placed along the beam ( 4 ), the other of said two pair of external guide beads ( 9 ) guiding the movement of the feed beam ( 4 ) with respect to a feed beam holder ( 3 ); wherein said individual external guide beads of said one pair of guide beads ( 8 ) are placed on opposite sides of the upper wall ( 11 ) at locations where the upper wall meets said side walls ( 13 , 14 ) and said individual external guide beads of said other pair of guide beads ( 9 ) are placed on opposite sides of the lower wall ( 12 ) at the locations where said lower wall meets said side walls ( 13 , 14 ) such that said individual external guide beads are positioned at each corner of said hollow extruded profile, each of the individual external guide beads ( 8 , 9 ) being configured in a substantially prismatic cross section so as to absorb forces tending to rotate the drilling machine relative to the feed beam, each of said individual external guide beads being integrally formed with said feed beam, and wherein internal longitudinal tracks ( 17 ) extend essentially along the centre of the side walls ( 13 , 14 ), the tracks ( 17 ) being adapted for guiding a drive mechanism ( 24 ) involved in driving the rock drilling machine ( 5 ).