DEVICE FOR PROTECTION OF INTERNAL AND EXTERNAL THREAD OF DRILLING PIPES WITH WELDED LOCKS Russian patent published in 2009 - IPC F16L57/00 B65D59/06 

FIELD: pipeline.

SUBSTANCE: device comprises body arranged in the form of truncated cone with a thrust element in the form of flange and profiled working surface coupled with a protected thread, which is arranged in the form of annular sealing elements installed in parallel rows with pitch equal to pitch of protected thread, each row of which comprises an even alternation of radius bulges arranged along circumference in plane that is perpendicular to axis of device body with minimum radial gaps between them, at the same time angle of inclination of sealing element radius bulge lateral surfaces exceeds angle of inclination of lateral surfaces of protected thread turns by value that allows for an elastic compression of material, and thrust element, external diametre of which does not exceed external diametre of lock is installed on the side of larger base of cone.

EFFECT: creation of universal devices only from polymer materials that provide for a reliable protection against damages in internal and external threads of drilling pipes with welded locks with thread of the left and right version, and reduced labour intensity of their manufacturing.

4 cl, 6 dwg