Patent ID: 9593541
Date: 2017-03-14
CPC Classifications: E21B

Claim:
1. An elongate drill component for percussive drilling comprising: a female threaded end having an outer diameter (Dot), a male threaded end having an outer diameter, and a central section disposed between said ends, the central section having an outer diameter (Doc), wherein the outer diameter of the female threaded end is larger than the outer diameter of the central section and the outer diameter of the male threaded end is smaller than the outer diameter of the female threaded end; and a through-going flushing channel including a central flushing channel located in the central section, which communicates with a thread flushing channel located in each of the female and male threaded ends, the central flushing channel having a diameter (Dic) and the thread flushing channels each having a diameter (Dit), wherein the ratio of an elastic section modulus of a threaded joint measured when the female threaded end is connected to the male threaded end of an identical component to an elastic section modulus of the central section, St/Sc, is more than 1.5 and in that a ratio of the diameter of the central flushing channel to the outer diameter of the central section, Dic/Doc is between 0.45 and 0.95.