Patent ID: 6022053
Filing Date: 2000-02-08
Classification: F16L

Abstract:
A joint for coupling tubes of a fluorocarbon resin, having a normal diameter portion, a large diameter portion near one end, and a crimp portion between said normal diameter portion and said large diameter portion prior to engagement with said joint, and forming a fastened portion by clamping said crimp portion with a cap nut consisting of a main body of rigid resin having a cylindrical portion, having a ring-shaped groove and a bevel at an inner wall end of said cylindrical portion; and a hard cap nut having an inner shoulder with a hook that forms an acute angle relative to the tube wall, wherein a major portion of the large diameter portion of the fluorocarbon resin tube is inserted into the ring-shaped groove; and wherein a tube clamp portion, as a hermetic portion presses said tube crimp portion against the inner wall end of the cylindrical portion with the inner shoulder of the hard cap nut by tightening the hard cap nut on an external thread of the outer wall of the cylindrical portion.