FEED-EXTENSION CYLINDER ARRANGEMENT IN A FEED BEAM FOR A ROCK DRILL

摘要

A feed-extension cylinder arrangement in a feed beam for a rock drill, the feed beam comprising a lower beam (2) and an upper beam (1) positioned slideably on top of it. The cylinder pipe of a feed extension cylinder (6) between the lower beam (2) and the upper beam (1) is fixed in a chute-like space (2c) of the lower beam (2) to the lower surface of the upper beam (1) immovably with respect to it. The piston rod (7) of the feed-extension cylinder (6) is connected at its end to the rear end of the lower beam (2) movably in its transverse direction, so that the feed-extension cylinder (6) and the piston rod (7) are always protected against damage, being positioned between the upper beam (1) and the lower beam (2).