Drill arrangement

Details Drill arrangement Drill arrangement

E - Fixed Constructions

21

B

255/8

E21B 43/10 (2006.01) E21B 7/20 (2006.01) E21B 10/32 (2006.01) E21B 10/40 (2006.01) E21B 10/58 (2006.01) E21B 10/66 (2006.01)

Patent

CA 1230325

ABSTRACT A drill arrangement The invention relates to an arrangement for drilling in soil and rock while simultaneously lining the drill hole with a lining tube. The arrange- ment includes an asymetric guide which is non-rotatably connected to a drill stem or like element, and cm 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.

463325

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