Down-the-hole drill assembly

Details Down-the-hole drill assembly Down-the-hole drill assembly

E - Fixed Constructions

21

B

E21B 4/14 (2006.01) E21B 10/36 (2006.01)

Patent

CA 2461985

The invention provides a down-the-hole drill assembly having exhaust passages from upper and lower chambers past the inner end of a bit and through the body of the bit to exit through the bit face. The construction of the assembly and bit obviates a foot valve tube from the head of the bit and the disadvantages associated with this component.

L'invention concerne un ensemble de forage d'un trou de sondage constitué de passages d'échappement des chambres supérieure et inférieure en passant par l'extrémité intérieure d'un trépan et dans le corps du trépan pour aboutir sur la surface du trépan. La construction de l'ensemble et du trépan élimine le besoin d'un tube à clapet à pied à la tête du trépan et les inconvénients liés à cet élément.

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