Patent ID: 7762592
Filing Date: 2010-07-27
Classification: F16L

Abstract:
1. A tube fitting, comprising: a body and nut that are joinable; said body having an interior bore that is adapted to receive a tube end along a longitudinal axis of the fitting; said bore having a camming surface at one end of said bore; said nut having an interior shoulder that forms a drive surface; and a ferrule having a front end and a back end; said ferrule back end engaging said nut drive surface when the fitting is pulled up; said ferrule front end engaging said camming surface during pull-up to provide a seal; said ferrule front end plastically deforming and having a front edge that is configured to bite into the tube end when the tube fitting is pulled up on the tube end; said nut when joined to said body driving said ferrule against said camming surface; wherein said camming surface forms an included angle of at least thirty-five degrees to about sixty degrees with respect to said longitudinal axis; and wherein said ferrule back end is radially spaced from the tube end after a completed pull-up of the fitting.