Cylindrical threaded connection with uniform interference
AssigneeThe Hydrill Company
InventorBrian E. Schwind
Life of this patent
Estimating the term…
Abstract
A cylindrical threaded connection in which most of the threads between the slightly tapered pin end and the slightly tapered box end have free running radial clearance therebetween. One or two revolutions of thread near the pin end or near the box opening have reduced root dimension or enlarged crest dimension to provide uniform interference in the last revolutions or so of complete connection makeup. This uniformly spreads the load over the axial distance of the interference.
Claims12
A cylindrical threaded connection comprising a pin end and a box end with threads of substantially uniform, taperless radial dimensions within the respective thread sets of said pin end and said box end and provided with free running radial clearance between the threads of said respective thread sets, said connection, having the improvement comprising uniform radial interference in at least one of the threads during the last revolution of at least one of the pin end and box end to provide an interference engagement prior to completed thread makeup as provided by an interfering thread configuration of uniform root-to-crest radial dimension.
Dependencies are inferred from the claim text.