Patent ID: 11898404
Assignee: BOART LONGYEAR COMPANY
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A threaded drill string component comprising:
a hollow body having a first end, an opposing second end, and a central axis extending through the hollow body; and
two threads positioned on the first end of the hollow body, each of the two threads having a leading end, wherein the leading ends of the two threads are circumferentially spaced 180 degrees apart; wherein:
each of the two threads comprises a plurality of helical turns extending along the first end of the hollow body from a location proximate a leading edge of the first end of the hollow body toward the second end of the hollow body,
each of the two threads has a thread root, a thread crest, a thread pitch, and a thread width,
each of the two threads has a clearance flank and a pressure flank, wherein the pressure flank is oriented at an angle ranging from +2 to +15 degrees relative to a plane perpendicular to the central axis of the hollow body,
the crest of at least one of the two threads circumscribes a frusta-conical surface extending over at least a portion of the axial length of the plurality of helical turns of said at least one thread,
the generatrix of the frusta-conical surface is a straight line that lies at an angle of 0.75 to 1.6 degrees relative to the central axis extending through the hollow body.