PNEUMATIC PERFORATOR Russian patent published in 2009 - IPC B25D17/26 E21B1/30 

FIELD: mechanics.

SUBSTANCE: proposed perforator comprises a casing with an air feed inlet, cylinder communicating with the aforesaid inlet via an appropriate system of air ducts, impact action piston with at least one part making an interface with the aforesaid cylinder, air flow control appliances and water feed inlet. Note also that the perforator incorporates at least one pair of contact surfaces whereon appropriate parts moving relative each other get into contact. The said impact action piston can reciprocate inside the aforesaid cylinder. The proposed device comprises water channels communicating with the aforesaid water feed inlet, as well as those feeding water or air saturated with water during perforator operation to, at least, aforesaid interface between the impact action piston and the cylinder for wetting that is lubing the said contact surfaces.

EFFECT: perforator operation without lubricants.

28 cl, 8 dwg