Method for casing drilling, drilling unit and adapter device

Details Method for casing drilling, drilling unit and adapter device Method for casing drilling, drilling unit and adapter device

2005-12-05

2009-11-17

Bagnell, David J (Department: 4117)

Boring or penetrating the earth

Processes

C173S001000, C173S184000, C175S203000

Reexamination Certificate

active

07617887

ABSTRACT:
A method for casing drilling, a drilling unit and an adapter device. The adapter device to be used in extension drill equipment drilling comprises an inner piece which can be rotated by the rotation device of the rock drilling machine. Around the inner piece, there is an outer piece which can be moved in the axial direction with respect to the inner piece. By changing the axial position of the outer piece, it can be selected whether the rotation force is directed from the rotation device to the inner rod or to the outer tube used in casing drilling during threading.

REFERENCES:
patent: 3231032 (1966-01-01), Genberg et al.
patent: 3835943 (1974-09-01), Bray
patent: 4582146 (1986-04-01), Becker
patent: 5263545 (1993-11-01), Tudora et al.
patent: 0 565 502 (1993-10-01), None
patent: 0 685 630 (1995-12-01), None
patent: 4-34193 (1992-02-01), None
patent: 91/04391 (1991-04-01), None
International Search Report dated Mar. 21, 2006 in PCT Application No. PCT/FI2005/050446.
Finnish Office Action dated Nov. 7, 2005 issue in Finland Application No. 20045467.

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