Pseudo two-step connection
AssigneeHydril Company
InventorHarris A. Reynolds, Jr.
Life of this patent
Estimating the term…
Abstract
A threaded connection includes a continuous pin thread including at least a first step, a mid-step, and a second step formed sequentially thereon. A continuous box thread includes at least a first step, a mid-step, and a second step formed sequentially thereon, wherein the steps on the box thread correspond generally in axial position with the steps on the pin thread. The first step has a first wedge ratio, the mid-step has a transition wedge ratio, and the second step has a second wedge ratio, wherein thread leads are substantially constant within each of the steps. The connection is designed such that at make-up of a pin member with a box member, a clearance exists between at least one of corresponding load flanks and corresponding stab flanks on at least one of the first step, the mid-step, and the second step.
Claims16
A threaded connection having wedge threads, the threaded connection comprising:
- a pin member comprising a continuous pin thread having a pin thread crest, a pin thread root, a pin load flank, and a pin stab flank, wherein the continuous pin thread comprises at least a first step, a mid-step, and a second step formed sequentially thereon;
- a box member comprising a continuous box thread having a box thread crest, a box thread root a box load flank, and a box stab flank, wherein the continuous box thread comprises at least a first step, a mid-step, and a second step formed sequentially thereon, the steps on the continuous box thread corresponding generally in axial position with the steps on the pin thread,
- wherein the first step has a first wedge ratio, the mid-step has a transition wedge ratio, and the second step has a second wedge ratio,
- wherein thread leads are substantially constant within each of the steps,
- wherein the connection is designed such that at make-up of the pin member with the box member, a clearance exists between at least one of the corresponding load flanks and the corresponding stab flanks on at least one of the first step, the mid-step, and the second step.
A threaded connection having wedge threads, the threaded connection comprising:
- a pin member comprising a continuous pin thread having a pin thread crest, a pin thread root, a pin load flank, and a pin stab flank, wherein the continuous pin thread comprises at least a first step, a mid-step, and a second step formed sequentially thereon;
- a box member comprising a continuous box thread having a box thread crest, a box thread root, a box load flank, and a box stab flank, wherein the continuous box thread comprises at least a first step, a mid-step, and a second step formed sequentially thereon, the steps on the continuous box thread corresponding generally in axial position with the steps on the continuous pin thread,
- wherein the first step has a first wedge ratio, the mid-step has a transition wedge ratio, and the second step has a second wedge ratio,
- wherein thread leads are substantially constant within each of the steps,
- wherein the connection is designed such that at make-up of the pin member with the box member, a clearance exists between both the corresponding load flanks and the corresponding stab flanks on at least one of the first step, the mid-step, and the second step.
Dependencies are inferred from the claim text.