Patent ID: 7416225
Filing Date: 2008-08-26
Classification: F16L

Abstract:
1. A tube fitting assembly comprising: a) a metal tube with a tube end; b) a fitting comprising a body and a nut that can be joined and only a single ferrule; said body having an interior bore that receives the metal tube end along a longitudinal axis of the fitting; said bore having a camming surface at a first end of said bore and a generally radial shoulder facing the tube end at a second end of said bore; c) said nut having a ferrule drive surface; and d) wherein the single ferrule has a front end and a back end; said ferrule back end being radially spaced from the tube end and having a ferrule driven surface engaging said nut ferrule drive surface when the fitting is pulled up; said ferrule front end engaging said camming surface to form a seal; said ferrule having a central bore formed by a continuous cylindrical interior wall closely received over the tube end during assembly; e) said ferrule front end including a front edge that indents into the tube end, wherein said continuous cylindrical interior wall deforms to form a convex portion in a longitudinal section; f) wherein said camming surface forms an included angle of about thirty-five degrees to about sixty degrees with respect to said longitudinal axis.