Patent ID: 6550544
Filing Date: 2003-04-22
Classification: E21B

Abstract:
Rock drilling device comprising a feed beam (1), a rock drilling machine movable to-and-fro along the feed beam, a pressure medium cylinder (3) of which one end (4) is fixed relative to the feed beam (1) and the other end (5) is movable relative to the feed beam and carries a sheave (6) over which a feed line (7) is routed, said feed line (7) being connected with the feed beam (1) and with the rock drilling machine (2) for feeding the rock drilling machine along the feed beam,characterized in that a further line (8) is arranged between two points (9, 10) which are fixed relative to the movable end (5) of the pressure medium cylinder (3), and that said further line (8) is connected with a measuring device (11) which is fixedly arranged on the feed beam (1).