Abstract: A rock drilling machine includes a sleeve having openings surrounding a portion of a lubrication channel. A groove surrounds the sleeve, and one end of a second channel is connected to the groove. The other end of the second channel is connected to a lubrication point so that lubricant from the lubrication channel is distributed from the lubrication channel, through the sleeve and groove to the second channel, and from the second channel to a lubrication point of the rock drilling machine.

Abstract: A downhole hammer is provided comprising a casing having a top sub at one end and a drill bit and support at the other end. A central tube is extended therethrough to define an annular space between the casing and the tube. A reciprocating piston is accommodated within the annular space and is operated by injecting a pressurized fluid from the surface into the annular space via a plurality of ports in the casing. The pressurized fluid is exhausted into the central tube and toward the surface via a plurality of passageways therethrough without contacting the borehole.

Abstract: A fluid operated rock drill hammer includes an annular hammer body with the upper end of the hammer body adapted to be connected to a drill string and with a drill chuck mounted at the lower end of the hammer body. A drill bit extends through the drill chuck into the body. A piston is slidably mounted in the hammer body to move axially between the drill bit and the upper end of the hammer body for striking the portion of the drill bit that extends through the drill chuck. The force for moving the piston is provided by a circulating fluid that is transmitted through the drill string into the hammer body. All of the fluid is transmitted between the hammer body and the piston at a single fixed axial position along the length of the hammer body.

Abstract: A down-the-hole pneumatic drill in which the reciprocating hammer-piston slides over a ported tubular structure mounted centrally in the cylinder of the drill body and providing two longitudinal passages through which passes all the pressure air required below the piston. The tubular structure comprises an outer tube having a close-fitting inner tube within it, the inner tube being formed in its wall with a longitudinal indentation closed at the lower end, one of the passages being defined by the indentation and the wall of the outer tube and the other passage being defined by the interior of the inner tube. The tubular structure is provided with ports controlled by the sliding hammer-piston, certain of these ports being formed by registering holes in portions of the walls of the inner and outer tubes which lie in contact with one another.

Abstract: The air hammer is adapted to be connected to a source of pressurized air and has an exhaust passage means controlled by a settable exhaust valve. Reciprocation of the hammer is controlled by an automatic valve when the hammer is active. The exhaust passage means and exhaust valve are arranged so that in a first set position of the exhaust valve, it renders the hammer operative by the pressurized live air under the control of the automatic valve, and in a second set position of the exhaust valve, it renders the hammer inoperative by the pressurized live air. Further, in said second position of the exhaust valve, it admits live air from said source to the tool continuously in sufficient volume to blow out of a hole, in which the tool is operating, particulate matter theretofore produced in the hole by the tool. In the first position, the exhaust valve stops the flow of live blow-out air to the tool.

Abstract: A down-the-hole hammer of the type adapted for receiving a bit at the lower end and for being connected to the lower end of a drill string through which compressed air is supplied to the hammer. The supply of air to the hammer when the bit at the lower end is resting on the bottom of the hole causes a piston in the hammer to reciprocate and to beat upon the upper end of the bit so that the material at the bottom of a hole is reduced. The piston, by reciprocating in the hammer, accomplishes the valving of the fluid which causes the piston to reciprocate, and when the hammer is lifted from the bottom of the hole and the bit moves downwardly, the piston ceases reciprocation while air blows off through the bit to the bottom thereof to clear debris from the hole being drilled.

Abstract: A fluid operated hammer for rock drills comprising; a cylinder, a drill chuck mounted at one end to receive a drill bit; a drill sub attached to the other end; a tubular fluid feed tube mounted in the drill sub and extending towards the chuck, the longitudinal central axis of the feed tube corresponding to the longitudinal central axis of the cylinder; at least one set of apertures provided in the side wall of the feed tube and spaced from each end; a piston slidably mounted in the cylinder and over the feed tube to move between the drill chuck and drill sub the lower end being adapted for striking a portion of the drill bit extending through the drill chuck; a first passageway in said piston communicating with one end face thereof and opening into the center of the piston at a location spaced along the length of said piston; a second passageway in said piston communicating with the end face of the piston communicating with the end of the piston opposite to that of the first passageway and opening into the ce

Abstract: A pneumatic percussion machine such as a drill, having a piston reciprocating in a casing, chambers formed in casing at or towards the ends of the piston, the arrangement permitting compressed air to be supplied alternatively to the chambers, the compressed air to the one chamber being supplied through a projecting member located co-axially in the casing and over which the piston reciprocates and compressed air from the other chamber being exhausted through the projecting member to the other chamber.

Abstract: An air hammer embodying an outer housing structure connectable to a rotatable drill pipe string through which compressed air is conducted. A hammer piston reciprocates in the housing structure, compressed air being directed alternately to the upper and lower ends of the piston to effect its reciprocation in the structure, each downward stroke inflicting an impact blow upon the anvil portion of an anvil bit extending upwardly within the lower portion of the housing structure. The compressed air acts against the piston over the full internal cross-sectional area of the housing structure in delivering its impact blow, such compressed air acting downwardly over at least a portion of the piston area during its entire downward stroke, including its latter portion, during which the power or impacting air is being exhausted from the housing structure.