Drill string component for drilling with a liquid driven drillin

Details Drill string component for drilling with a liquid driven drillin Drill string component for drilling with a liquid driven drillin

1993-05-07

1994-12-27

Bagnell, David J.

Boring or penetrating the earth

With above-ground means for handling drilling fluid or cutting

With tool shaft having plural passages for drilling fluid

175322, F21B 1707, F21B 1718

Patent

active

053756703

ABSTRACT:
Drill string component for use at drilling with a liquid driven down-the-hole drilling machine (1) comprising three coaxial tubes (2,4,6) for forming channels for supply of driving medium to the down-the-hole drilling machine, return of the driving medium after it has done its work and supply of flushing medium to the bore hole. The outer tube (2) of the drill string component is provided with a first end piece (7) which is axially displaceable relative to the outer tube and axially lockable relative to the outer tube in an outer position so that the inner tubes (4,6) are protected against damage when the drill string component is not connected with another drill string component, the hammer device (1) or a rotary device (9) for rotation of the drill string.

REFERENCES:
patent: 1891416 (1932-12-01), Harris
patent: 1897121 (1933-02-01), Harris
patent: 3664443 (1972-05-01), Campbell
patent: 4991669 (1991-02-01), Anderson

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