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| Number | Title | Issue Date |
| 4917194 | Improved downhole hammer 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 accom... | 04/17/1990 |
| 4312412 | Fluid operated rock drill hammer 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 ch... | 01/26/1982 |
| 4133393 | Down-the-hole percussion drills 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 ... | 01/09/1979 |
| 4105080 | Air hammer with blow-out air system 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 passag... | 08/08/1978 |
| 4050525 | Down-the-hole hammer 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 en... | 09/27/1977 |
| 4015670 | Fluid operated hammer 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 longitu... | 04/05/1977 |
| 3970153 | Pneumatic percussion machines 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 compress... | 07/20/1976 |
| 3944003 | Bore hole air hammer 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 lo... | 03/16/1976 |
