Down the hole hammer equipment

Details Down the hole hammer equipment Down the hole hammer equipment

B - Operations, Transporting

25

D

121/22

B25D 9/16 (2006.01) E21B 4/14 (2006.01)

Patent

CA 1226488

ABSTRACT A pneumatic percussion machine has chambers at its ends with air inlet and exhaust passages thereto, controlled by a piston reciprocable between the chambers, an air supply passage from an axially adjacent end chamber to a third chamber being opened only after the air supply to the other end chamber is closed off.

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