Tube rod

Details Tube rod Tube rod

E - Fixed Constructions

21

B

E21B 17/00 (2006.01) E21B 1/00 (2006.01) E21B 17/042 (2006.01)

Patent

CA 2278987

A tube rod for rock drilling has a female threaded end into which a male thread (either on a male connector or on the end of another tube rod) can be screwed to form part of a drill string. The female threaded end is (a) of larger external diameter than the central section of the rod and (b) has an annular groove with an asymmetrical profile, the flank of this groove nearest the to threaded end being steeper than the other flank.

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