Down-the-hole drill assembly

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

2007-04-03

2007-04-03

Bagnell, David (Department: 3672)

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

C175S293000, C173S136000

Reexamination Certificate

active

10806745

ABSTRACT:
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.

REFERENCES:
patent: 3164214 (1965-01-01), Oelke
patent: 3692122 (1972-09-01), Curington
patent: 5115875 (1992-05-01), Ennis
patent: 5647445 (1997-07-01), Puchala

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