Fluid operated rock drill hammer

Details Fluid operated rock drill hammer Fluid operated rock drill hammer

E - Fixed Constructions

21

B

255/13

E21B 4/14 (2006.01)

Patent

CA 1131210

FLUID OPERATED ROCK DRILL HAMMER Abstract of the Disclosure 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.

355580

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