Dual bushing centralizer

Details Dual bushing centralizer Dual bushing centralizer

1981-09-01

1983-03-22

Novosad, Stephen J.

Boring or penetrating the earth

With above-ground means for handling drilling fluid or cutting

Fluid or cuttings directing or receiving means engaging bore...

175220, E21C 702

Patent

active

043772137

ABSTRACT:
A dual bushing centralizer is provided for a rock drill. The one bushing is provided for stabilizing the rock bit and a second bushing is provided which stabilizes the drill rod. An elastomeric stinger encapsulates both bushings and also provides a noise reduction seal around the drilled hole.

REFERENCES:
patent: 1928291 (1933-09-01), Kelley
patent: 2107552 (1938-02-01), Smith
patent: 3045769 (1962-07-01), Feucht et al.
patent: 3417830 (1968-12-01), Nichols
patent: 3598192 (1971-08-01), Becker
patent: 3788423 (1974-01-01), Nittinger et al.
patent: 3915227 (1975-10-01), Simpson
patent: 4182424 (1980-01-01), Prebensen

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