Patent ID: 6131963
Filing Date: 2000-10-17
Classification: F16L

Abstract:
A tube fitting comprising: a fitting body having a cylindrical bore for receiving a tube end and including a tapered mouth at one end of said bore; a drive member having a threaded engagement with said body and having a ferrule drive surface; a first ferrule having a tapered first end that extends into said tapered mouth of the fitting body and having a second end with a tapered recess that axially extends toward said first end; and a second ferrule having a substantially continuous cylindrical interior wall that closely surrounds the tube end, a tapered first end that extends into said tapered recess of said first ferrule, and having a contoured face on a second end thereof that engages said drive member ferrule drive member ferrule drive surface; said second ferrule substantially continuois cylindrical interior wall having a circumferentially recess located between said first and second ends of said second ferrule and axially spaced from said second ferrule first end; said recess and sid contoured face reducing force concentrations on said drive member drive surface when the fitting is pulled up.