Patent ID: 9383048
Filing Date: 2016-07-05
CPC Classification: F16L

Claim Text:
1. A tube fitting comprising a fitting body having a cylindrical bore to closely receive a tube end, a frusto-conical counterbore defining an entrance to said cylindrical bore, a nut member threaded for connection to said fitting body and when joined with said fitting body defining a chamber for enclosing the tube end, a front ferrule with a tapered nose extending into said frusto-conical counterbore and a rear wall located axially outward relative to said tapered nose, a rear ferrule having a rear wall engaged by an axial inner end wall of said nut member and a tapered nose extending into a tapered recess formed in said rear wall of said front ferrule, said rear ferrule comprising a cylindrical interior wall that extends from a front end of said rear ferrule to said rear wall of said rear ferrule with a circumferentially continuous recess located between said rear ferrule tapered nose and said rear ferrule rear wall, and a tapering outer wall portion disposed between said rear wall and said tapered nose of said rear ferrule.