Percussive action machine for making holes in the ground

Details Percussive action machine for making holes in the ground Percussive action machine for making holes in the ground

E - Fixed Constructions

21

B

255/13

E21B 4/06 (2006.01) E21B 4/14 (2006.01)

Patent

CA 1237420

PERCUSSIVE ACTION MACHINE FOR MAKING HOLES IN THE GROUND Abstract A percussive action machine comprises a housing in which a hammer is movably secured to define a for- ward stroke chamber and a return stroke chamber. The hammer is provided with an air-distributor fashioned as a sleeve having holes. The hammer is further provided with a means for alternately communicating the return stroke chamber with the forward stroke chamber and with the outside, this means having the form of at least one bore arranged inside the hammer in line with its axis. Communicating with this bore is a tubular control valve extending through the forward stroke chamber and having in its wall at least one hole wherethrough the return stroke chamber alternately communicates with the forward stroke chamber and with the outside.

479374

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