Drill string component

Details Drill string component Drill string component

E - Fixed Constructions

21

B

E21B 17/00 (2006.01) E21B 17/07 (2006.01) E21B 17/18 (2006.01)

Patent

CA 2095906

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 channelsfor 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 ube (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 rotarydevice (9) for rotation of the drill string. 92006.utl

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