Percussive drilling apparatus

Details Percussive drilling apparatus Percussive drilling apparatus

1999-04-26

2000-12-26

Pezzuto, Robert E.

Boring or penetrating the earth

Below-ground impact members

E21B 1044

Patent

active

061643920

ABSTRACT:
A percussive drill for extension drilling includes a drill bit, a tube having a male screw thread attached to a female screw thread of the drill bit, and a rod having a male screw thread attached to a female screw thread of the tube. Central passages of the rod and tube are aligned with one another to conduct flushing fluid to the drill bit. The drill bit drills a hole whose diameter is from 60-170 mm and at least twice the outer diameter of the rod. A total area of a cross-sectional surface of the tube is within 100-125% of a total area of a cross sectional surface of the rod.

REFERENCES:
patent: 4106573 (1978-08-01), Bailey
patent: 4265321 (1981-05-01), Hibbard
patent: 4625814 (1986-12-01), Helasuo et al.
patent: 4694911 (1987-09-01), Kennedy
patent: 4726429 (1988-02-01), Kennedy

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