Impact absorbing mechanism for deep hole hammer drill, has air hole provided for connecting cylinder chamber and channel, which is closed by piston on exertion of axial force

摘要

The mechanism has a sleeve (17) forming a chamber (18). Piston (19) sliding in the cylinder is provided with channel (30). An air hole (29) is provided for connecting cylinder chamber and channel. Air hole is closed by movement of piston when thrust acts in axial direction.