Patent ID: 6877781
Filing Date: 2005-04-12
Classification: F16L,Y10S

Abstract:
1. A fitting for an end of a length of tubing having corrugations ranging between a maximum diameter and a minimum diameter, the fitting comprising: a retainer having at least one ridge sized to extend inwardly to a radius between said maximum and minimum diameters for gripping the tubing axially above an endmost corrugation of the tubing, wherein the retainer has a flat axially facing surface disposed above said endmost corrugation; a body having a hollow cylindrical part sized to admit the retainer, the body having at least one threaded surface; a nut having a thread complementary with the threaded surface of the body, the nut having a cap part configured to engage the retainer for urging the retainer axially into the body with threaded advance of the nut relative to the body; wherein the body has an inwardly tapered conical surface with a circular outer radius surrounded by an annular groove, thereby defining a sharp edge opposed to the axially facing surface of the retainer, wherein the sharp edge is disposed between said maximum and minimum diameters and a circular nip is formed between the sharp edge and the axially facing surface of the endmost corrugation, and tightened by advance of the nut on the body.