Drilling apparatus

Details Drilling apparatus Drilling apparatus

1984-02-27

1986-02-25

Leppink, James A.

Boring or penetrating the earth

With tool shaft detail

Shaft carried guide or protector

175 73, 175321, E21B 710, E21B 1710

Patent

active

045723052

ABSTRACT:
A stabilizer for use in drilling and having its effective outside diameter adjustable by alteration of axial forces applied to the stabilizer during drilling.

REFERENCES:
patent: 2819039 (1958-01-01), Lindsay et al.
patent: 3145785 (1964-08-01), Kellner
patent: 3180439 (1965-04-01), Deely
patent: 3370657 (1968-02-01), Antle
patent: 4270619 (1981-06-01), Base
patent: 4388974 (1983-06-01), Jones, Jr. et al.
patent: 4407377 (1983-10-01), Russell

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