Abstract: A pneumatic rockdrill having a housing; a cylinder connected to a compressed air supply inlet by a set of air passages; an impact piston, at least part of which is reciprocable within the cylinder; and a controller for the supply of compressed air from the air supply inlet to the cylinder. At least one pair of contact surfaces are located at the interface between the piston and the cylinder, where those relatively moving parts contact one another. At least one water supply inlet and water paths connected to the water supply inlet(s) are configured so as in operation to convey water to a drilling tool to flush a hole being drilled, and to supply water to wet the contact surfaces.

Abstract: The invention relates to a pneumatic rockdrill (99) comprising: a housing, including an air supply inlet for receiving compressed air, and a cylinder (50), connected to the air supply inlet by a set of air passages; an impact piston (14), at least part of which is reciprocable within the cylinder (50); and air-flow control means for controlling the supply of compressed air from the air supply inlet to the cylinder (50); the rockdrill (99) including at least one pair of corresponding contact surfaces at which relatively-moving parts contact one another; and the rockdrill being characterized by including at least one water supply inlet and water paths connected to the water supply inlet(s) and configured so as in operation to convey water to a drilling tool so as to flush a hole being drilled and to supply water to wet the aforesaid contact surfaces.