Pullout resistant pipe coupling
AssigneeDresser Industries, Inc.
InventorJames J. Van Houtte
Life of this patent
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Abstract
An improved construction for resisting pipe pullout in a pipe coupling of a type subject to being inwardly swaged in the course of forming a coupled joint. A circumferentially extending lock ring having a plurality of axially spaced chisel shaped teeth on its inward face is inwardly dished about its periphery. The ring is axially located within the coupling shell by an annular inwardly extending protuberance on the inner face of shell interfitting within the dished section of the ring periphery. In response to an imposed swaging force, the coupling shell is constricted inwardly to compress a gasket into sealing engagement with a contained pipe section, while the lock ring is concomitantly constricted inwardly into a gripping interlock therewith.
Claims6
In a pipe coupling including a radially deformable elongated shell in which to receive a pipe section to be coupled, at least one gasket recess defined interior of said shell in a deformable section thereof and a gasket contained in said recess, the improvement for restraining pullout of a pipe section coupled thereat and comprising:
- (a) an inward protuberance defined interior of said shell on a deformable section thereof axially displaced from said gasket recess;
- and
- (b) a lock ring having a toothed inner face and including means adapted for positioned placement of the lock ring axially retained against the inner face of said protuberance, said lock ring when positioned placed against said protuberance being responsive to inward deformation of said protuberance to constrict radially inward into a penetrating gripping engagement with a contained pipe section to impose a restraining force on the pipe section sufficient to restrain the pipe section against a predetermined drawbar pull potentially incurred thereby.
Dependencies are inferred from the claim text.