Percussion drilling improvements

Details Percussion drilling improvements Percussion drilling improvements

E - Fixed Constructions

21

B

E21B 4/14 (2006.01)

Patent

CA 2159904

An hydraulically driven percussive hammer for use with down-the-hole percussive hammer drilling, the hammer having a piston and liner combination which provides for multiple stages where there are successive effective piston drive areas of diminishing size for both return and impact directions which minimises peak pressures from hydraulic hammer effects.

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