Patent ID: 6601879
Filing Date: 2003-08-05
Classification: F16L

Abstract:
A combination of a plastic fluoropolymer fitting and a plastic fluoropolymer tube, the fitting for coupling to a flared end of the tube, said flared end having an elongated â€œSâ€  shape in the cross section, the tubing having a first tubing portion of a first diameter integral with a curvilinear transition portion, and a second tubing portion having a wall thickness and a second diameter integral with the curvilinear transition portion and concentric with the first tubing portion, said fitting comprising:a fitting body with a first end and a second end and a flow conduit extending therethrough, the first end having a recess with inwardly facing threads with a tapered nose section inset therein, the tapered nose section having a curvilinear side wall configured to cooperate with the curvilinear transition portion of the tubing, and wherein said tapered nose section further defines a converging annular recess with a radial gap that narrows toward said second end of the fitting body, said radial gap narrowing to a dimension less that the wall thickness of the second tubing portion; a fitting nut operably joinable to said fitting body in the recess, said fitting nut having exterior threads sized to cooperate with the inwardly facing threads of the fitting body and a flare-engaging collar, the nut having a bore sized to slidingly fit on the first tubing portion, wherein the collar of said fitting nut has a pair of annular contact points with a gap therebetween, the collar configured to position on annular contact point to engage the flared end proximate the first tubing portion and the other annular contact point to engage the flared end on the curvilinear transition portion; whereby upon tightening of the fitting nut into the recess of the fitting body with the flared end of the tubing therein, the second tubing portion seats and seals within the converging annular recess of the fitting body.