Drilling head

Details Drilling head Drilling head

1981-11-23

1985-07-02

Leppink, James A.

Boring or penetrating the earth

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

Rotary drive for a relatively advancing tool

166 84, 277 31, 285414, E21B 304

Patent

active

045262438

ABSTRACT:
Drilling head incorporating downwardly facing lip type bearing seals, stationary seal cartridge for head seal, rotating replaceable seal bushing for head seal, and optional screw connection for removable side outlet.

REFERENCES:
patent: 3418009 (1968-12-01), Polla
patent: 3836183 (1974-09-01), Battle
patent: 4157186 (1979-06-01), Murray et al.
patent: 4208056 (1980-06-01), Biffle
patent: 4293047 (1981-10-01), Young
patent: 4312404 (1982-01-01), Morrow

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