Down-the-hole drilling machine.

摘要

Down-the-hole drilling machine comprising a housing in form of a tube (1), a hammer piston (6) being movable to-and-fro in the tube and intended for impacting a drill bit (5). The hammer piston is at its ends provided with end sections in form of polygons with rounded corners(51, 52). These end sections are turned relative to each other an angle which is half as large as the angle between two adjacent corners. <IMAGE>