Impact block assembly for percussion drilling apparatus

Details Impact block assembly for percussion drilling apparatus Impact block assembly for percussion drilling apparatus

E - Fixed Constructions

21

B

E21B 4/16 (2006.01) E21B 4/06 (2006.01) E21B 4/14 (2006.01) E21C 3/18 (1990.01)

Patent

CA 2098787

Abstract of the Disclosure In a percussion drilling apparatus, an impact block assembly is provided for sequentially driving drill rods into a subterranean formation, the impact block assembly including an impact block member aligned with one or more rows of drill rods and a combustion operated piston is arranged above the impact block assembly for sequen- tially driving each of the impact members downwardly into engagement with the aligned drill rods.

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