THREADED CONNECTING END FOR COMPONENT OF DRILL STRING Russian patent published in 2020 - IPC E21B17/42 F16L15/06 

FIELD: soil or rock drilling; mining.

SUBSTANCE: group of inventions relates to threaded elements for a drill string component. Threaded connecting element of percussion component of drill string comprises housing with part with longitudinal axis, around which thread passes to form one half of threaded joint. Body comprises threaded shank end and end conical part, wherein thread extends axially between thread-free shank and extreme conical part. Thread is formed by at least one flange extending circumferentially and axially along the housing, as helical turns having peaks and recesses, separated by axially corresponding working sides, thread has axially spaced first end and second end of thread, wherein first end ends on conical part and second end ends on threadless shank. First extreme helical turn is terminated at the first end, the second extreme helical coil is terminated at the second end, besides, the second extreme helical turn contains a transition zone containing the transient beginning and the transition end. In the transition zone: the thread depth corresponding to the radial distance between the recess and the apex decreases between the transition end and the transition end and makes zero at the transition end or substantially zero, the second extreme helical coil having a vertex limited by two asymmetric working sides on each axial side, wherein extreme asymmetric working side is formed by asymmetric working side axially closest to threadless shank, and axial length of extreme working side decreases faster than adjacent working side.

EFFECT: technical result is possibility of withstanding forces from asymmetrical load acting on drill pipe, reduced voltage and fatigue on threaded part and minimization of risk of coupling element failure.

15 cl, 9 dwg