Convoluted hose fitting

A hose fitting for hose having a convoluted inner tube of synthetic plastic material comprising, in combination, a tubular nipple having a bore, an outer connection end, a hose receiving outer surface and an inner hose receiving end, connection means defined on said nipple connection end, a helical projection defined upon said nipple outer surface adjacent said inner end having a pitch substantially corresponding to the pitch of the convolutions of the hose inner tube to be received upon said outer surface, an annular socket circumscribing said nipple outer surface having an inner surface, a plurality of axially spaced locking annular serrations defined on said socket inner surface for engaging and compressing a hose mounted upon said nipple outer surface, said serrations each including a conical surface defined thereon on the side of the serrations disposed toward said nipple inner end and converging in a direction away from said nipple inner end whereby said conical surfaces aid in the insertion of hose upon said nipple and within said socket, said nipple outer surface in radial alignment with said locking serrations increasing in diameter in the axial direction from said outer end toward said inner end defining a reverse angle ramp to resist separation of a hose mounted on said nipple outer surface under tension forces, annular grooves defined in said nipple outer surface in radial alignment with at least two of said annular serrations, said grooves each including a radial side defining the groove side nearest said nipple inner end, and an annular secondary serration defined on said socket inner surface intermediate said reverse angle ramp and said helical projection to compress hose located on said nipple outer surface intermediate said locking serrations.