Reversible casing for a self-lubricating, fluid-actuated, percus

Details Reversible casing for a self-lubricating, fluid-actuated, percus Reversible casing for a self-lubricating, fluid-actuated, percus

1995-08-30

1996-10-22

Tsay, Frank

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

175215, 173135, E21B 414

Patent

active

055667716

ABSTRACT:
A reversible casing for a fluid-actuated, percussive, down-the-hole drill is provided with a tubular body having an internal surface forming a bore extending along a longitudinal axis. The internal surface has a profile that is a mirror image about a centerline axis perpendicular to the longitudinal axis. The profile is provided with alternating undercut portions and land portions, with a portion of the undercut portions being in an annular scalloped configuration comprising a plurality of longitudinally extending parallel grooves in the internal surface.

REFERENCES:
patent: 3941196 (1976-03-01), Curington et al.
patent: 4084646 (1978-04-01), Kurt
patent: 4321974 (1982-03-01), Klemm
patent: 4660658 (1987-04-01), Gustafsson
patent: 4819746 (1989-04-01), Brown et al.
patent: 5311948 (1994-05-01), Kimberlin
patent: 5390749 (1995-02-01), Lyon

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