Self-locking coupling

Claim 1

A coupling device for providing a fluid tight connection with a flexible conduit comprising: a male member having a cylindrical body portion integral with an enlarged circumferential portion near one end, said enlarged portion having an inner conical surface that diverges toward said one end, a relatively narrow and generally cylindrical surface adjacent said inner conical surface which is only slightly larger in diameter than the conduit to be coupled, and an outer conical surface that converges from said cylindrical surface toward the end of said male member, said male member also including an additional cylindrical tubular portion extending axially from the smaller end of said outer conical surface; means attached to the other end of said body portion forming a shoulder substantially transverse to the axis of said male member; a female member attached to and movable on said male member, said female member having an annular sleeve portion with a conical inner surface that diverges from an inner to an outer edge and a plurality of circumferentially spaced apart arms projecting substantially parallel to the axis of said sleeve portion from its said inner edge, said female member having means extending inwardly to a smaller diameter than said enlarged portion of said male member so that it will be retained on and not separated from said male member when not in use as well as when connected to a conduit.