Down-the-hole hammer drill having reverse circulation

Details Down-the-hole hammer drill having reverse circulation Down-the-hole hammer drill having reverse circulation

1993-04-08

1995-04-18

Melius, Terry Lee

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

175306, 175418, E21B 414

Patent

active

054070210

ABSTRACT:
A down-the-hole hammer drill having a reverse circulation system which conducts pressurized air downwardly to a lower cutting face of a drill bit. The air travels across the cutting face and upwardly through a central exhaust passage. The air is conducted to the cutting face through longitudinal and lateral passages in the bit which are kept isolated from the environment surrounding the bit so that no appreciable amount of pressurized air can escape, and so that the passages do not become clogged with dirt. The drill bit comprises upper and lower pieces. Upper sections of the longitudinal passages are formed in the upper piece, and lower sections of the longitudinal passages are formed in the lower piece.

REFERENCES:
patent: 3951220 (1976-04-01), Phillips, Jr. et al.
patent: 4321974 (1982-03-01), Klemm
patent: 4527641 (1985-07-01), Klemm
patent: 4705118 (1987-11-01), Ennis
patent: 4819746 (1989-04-01), Brown et al.
patent: 4921056 (1990-05-01), Ennis
patent: 4940097 (1990-07-01), Martini
patent: 5139096 (1992-08-01), Lister

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