Reverse percussion device

Details Reverse percussion device Reverse percussion device

E - Fixed Constructions

21

B

E21B 4/14 (2006.01) B25D 9/14 (2006.01) E21B 1/02 (2006.01) E21B 31/107 (2006.01) B25D 9/00 (2006.01)

Patent

CA 2190248

A reverse percussion device (30) for use with hydraulic percussive drills is provided. The reverse percussion device (30) includes a cycling piston (34), valve (36) and anvil (38). The piston (34) and valve (36) move in opposing directions between low and high pressure passages automatically until a lodged drill bit (18) is freed, thereby facilitating removal of the drill bit (18) from the drilled hole and eliminating alternate loosening and tightening of drill string threads (14). The reverse percussion device (30) preferably includes an automatic disabling feature which causes the reverse percussion operation to cease when the bit is free to retract normally.

L'invention concerne un dispositif à percussion inverse (30) destiné à des engins perforateurs hydrauliques. Le dispositif à percussion inverse (30) comporte un piston (34) animé d'un mouvement de va-et-vient (34), une vanne (36) et une enclume (38). Le piston (34) et la vanne (36) se déplacent automatiquement dans des directions opposées entre des passages basse pression et haute pression, et cela d'une manière automatique jusqu'à ce qu'un foret (18) installé soit libéré, ce qui facilite l'extraction du foret (18) du trou percé et élimine le relâchement et le serrage successifs des filetages des trains (14) de tiges. Le dispositif à percussion inverse (30) comporte de préférence un élément automatique de désactivation qui provoque l'arrêt de l'opération de percussion inverse lorsque le foret peut se retirer normalement.

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