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US 6,578,880 B2Granted
Wedgethread pipe connection
AssigneeRamos, Beverly Watts
InventorJohn D. Watts
Life of this patent
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AssigneeRamos, Beverly Watts
InventorJohn D. Watts
Estimating the term…
Several embodiments of a wedgethread pipe connection are disclosed that have improved makeup, sealing, and non-loosening characteristics. In one embodiment, an open wedgethread is disclosed that has an included angle measured in the gap between the stab flank and the load flank to be not less than zero, so as to prevent premature wedging between mating flanks before the position of full makeup is reached, as does occur between trapped wedgethreads wherein the included angle is less than zero. The invention may be used for pipe threads large or small, as a flush joint, with collars, screwed into plates or it may even be used to reversibly connect such as solid posts to base members where a wide makeup torque range is desired. This Open wedgethread, as opposed to trapped wedgethreads, provides a threaded pipe connection that: is more cost-effective; can seal high pressure gas; can provide selectively a connection strength as high as the pipe strength; assures easy makeup to the desired position of full makeup within a wide torque range; may have a torque strength as high as the pipe torque strength; is easier to manufacture; is easier to gage; and is less subject to handling damage.
A threaded connection having a box (2) and pin (1) formed with mating wedgethreads, the box threads having crests (21), roots (8), stab flanks (4), load flanks (6), the pin threads having crests (7), roots (20), stab flanks (3) and load flanks (5), and an included angle (35) measured between the load flank and stab flank of both the box and pin, comprising:
A pipe connection having a box (2) and pin (1) formed with mating wedgethreads, the box threads having crests (21), roots (8), stab flanks (4) and load flanks (6), and the pin threads having crests (7), roots (20), stab flanks (3), load flanks (5) and an included angle measured in a gap between each set of load and stab flanks, wherein box root (8) and pin crest (7) comprise an outer set of cooperating surfaces, and box crest (21) and pin root (36) comprise an inner set of cooperating surfaces, the wedgethreads being coated with thread dope suitable to seal and lubricate between the mating threads, comprising:
A threaded pipe connection having a box (2) and pin (1) formed with tapered mating wedge threads for assembly with the use of thread dope, the thread dope being a desired mixture of grease and solid particles suitable to lubricate and seal between the mating threads, a bridge thickness dimension (22) above which the solid particles will not seal gaps between mating threads, the threads having crests, roots, stab flanks, and load flanks, comprising:
Dependencies are inferred from the claim text.