Valveless down-the-hole drill

摘要: A valveless down-the-hole hammer drill is actuated by fluid such as compressed air. The includes a piston disposed within chamber defined an outer wear sleeve, air diverter at one end and suspendably mounted bit the other end, wherein has slidable contact surface with towards each of piston, that slidably reciprocable chamber. Porting exhaust arrangements alternately supply live pressure to either reciprocate it cause repeatedly strike bit. An intermediate compression between two sliding surfaces sleeve. Air trapped in so apply retarding force on return stroke, provide additional impetus commencement drive stroke. Sealing reduce leakage past working clearance gaps are also disclosed.