Importance

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Abstract

A fitting having a collar defining a bore which accommodates a plastic tube. The collar defines a tapered seat on the end thereof. A tapered plastic ferrule surrounds the tube and cooperates with the tapered seat for compressing the ferrule into sealing engagement with the tube. The ferrule has an axial end face adapted to abut a deformable plastic gripper sleeve which surrounds the tube, the gripper being surrounded by a nut which threads over the collar. The gripper is disposed in a tapered bore in the nut. The gripper has a tapered exterior surface which extends at an angle which is slightly greater than the angle of the tapered bore. When the nut is threaded onto the collar, the differential taper causes an axial torque to be imposed on the gripper so as to radially distort the gripper into gripping engagement with the tube. The gripper has an axial end surface which, when nondistorted, is slightly sloped axially away from the ferrule as it projects radially outwardly. This end surface is distorted and flattened upon tightening of the nut on the collar so as to abut the end face of the ferrule.

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First Claim