Drill arrangement

Details Drill arrangement Drill arrangement

1984-09-12

1986-11-04

Levy, Stuart S.

Boring or penetrating the earth

Means traveling with tool to constrain tool to bore along...

175398, 175399, E21B 700

Patent

active

046206000

ABSTRACT:
The invention relates to an arrangement for drilling in soil and rock while simultaneously lining the drill hole with a lining tube. The arrangement includes an asymetric guide which is non-rotatably connected to a drill stem or like element, and an eccentric drill bit or crown which is journalled for limited rotation in the guide. The guide is arranged to lie solely against a part of one side of the inner surface of the lining tube during a drilling operation. Advantageously, the guide is supplemented with a guiding portion on the shank part of the drill bit located opposite the first guide. The drill arrangement enables wide adjustments to be made to the eccentric setting of the drill bit, and makes possible an advantageous forming of the cutting geometry of the drill bit.

REFERENCES:
patent: 3174563 (1965-03-01), Edblom et al.
patent: 3199616 (1965-08-01), Hjalsten
patent: 3277972 (1966-10-01), Lagerstrom
patent: 3416616 (1968-12-01), Ahlgren
patent: 3753470 (1973-08-01), Lagerstrom et al.
patent: 3848683 (1974-11-01), Persson
patent: 4183415 (1980-01-01), Stenuick

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