Step tube rod, and drilling machine

Details Step tube rod, and drilling machine Step tube rod, and drilling machine

E - Fixed Constructions

21

B

E21B 17/042 (2006.01) E21B 6/02 (2006.01) E21B 19/24 (2006.01)

Patent

CA 2411253

In a drill rod for a drilling machine, the rod outer diameter has a large diameter almost equal to the drill hole diameter, an a male thread is formed at one end and a female thread at the other end, with at least one small diameter portion adjacent the female thread. This step tube rod is capable of reducing the bending of holes. Further, a drilling machine using this step tube rod facilitates the positioning of the drill rod and is capable of efficiently and safely effecting the connecting and recovering operation.

L'invention concerne une tige de forage pour machine de forage. Le diamètre extérieur de la tige est un diamètre de grande dimension presqu'égal au diamètre du trou de forage. Un filetage mâle est formé à une extrémité et un filetage femelle est formé à l'autre extrémité, avec au moins une partie de faible diamètre adjacente au filetage mâle. Ladite tige tubulaire à étages peut réduire la flexion des trous. De plus, une machine de forage utilisant ladite tige tubulaire à étages facilite le positionnement de la tige de forage et peut effectuer de manière efficace et sûre l'opération de connexion et de récupération.

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