Kelly bar having hardened flutes

Details Kelly bar having hardened flutes Kelly bar having hardened flutes

1995-06-05

1996-12-24

Neuder, William P.

Boring or penetrating the earth

With tool drive prime mover or above-ground mechanical...

Rotary drive for a relatively advancing tool

E21B 304

Patent

active

055866107

ABSTRACT:
A kelly bar for rotary drilling machines comprises a hollow, tubular, elongated body having a plurality of electric arc gouged flutes therein, each flute having a hardened, heat-affected zone beneath its bottom surface to provide improved wear.

REFERENCES:
patent: 3561545 (1971-02-01), Rassieur
patent: 4393945 (1983-07-01), Rassieur
patent: 5062490 (1991-11-01), Rassieur
patent: 5368083 (1994-11-01), Beck, III

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