Threaded joint
AssigneeDiversity Technologies Corporation
InventorStephane Perron
Life of this patent
Estimating the term…
Abstract
There is disclosed a threaded joint for coupling together rods, tubes, pipes etc. The joint consists of helical box and pin thread segments each defined by a pressure flank and a clearance flank spaced apart from each other with alternating roots and crests. The pressure flank is defined by an S-curve extending between the root and the crest, which is defined by a first curvature c1 adjacent to the root and a second curvature c2 adjacent to the crest. c1 and c2 curve in opposing directions with an inflection point “i” between curvatures c1 and c2.
Claims21
A threaded joint for coupling together first and second members, each of said members having a central axis between respective ends thereof, said joint comprising:
- a pin thread segment at one end of said first member;
- and
- a tubular box thread segment at one end of said second member, said box thread segment and said pin thread segment each comprising
- a helical thread defined by a pressure flank;
- and
- a clearance flank spaced apart from each other with alternating roots and crests extending between said pressure flanks and clearance flanks, wherein said pressure flank comprises:
- an S-curve extending between said root and said crest, wherein a surface of said S-curve is continuously curved between said root and said crest, said S-curve defined by
- a first curvature c1 adjacent to said root and
- a second curvature c2 adjacent to said crest, c1 and c2 curving in opposing directions with an inflection point “i” between said curvatures c1 and c2, wherein c1, or c2, or both c1 and c2 comprises
- a compound curvature comprising
- a segment of a first circle having a radius R3 and
- a segment of a second circle having a radius R2 wherein the ratio of R2:R3 is at least about 3:1.
Dependencies are inferred from the claim text.