Abstract: A tube fitting has: a body having a bore for receiving a tube end and includes a tapered mouth at one end of the body; a drive member having a threaded engagement with the body and having a drive surface; a first ferrule having a tapered first end that extends into the tapered mouth of the body and having a second end with a tapered recess that axially extends toward the first end; and a second ferrule having a tapered first end that extends into the tapered recess of the first ferrule, and having a driven surface on a second end thereof that engages the drive member drive surface; the first ferrule having an outer generally conical surface that forms the tapered first end and forms a seal with the tapered mouth when the fitting is assembled and tightened. The fitting includes a vent in the form of a hole, bore or other fluid passageway in the drive member to relieve pressure when the drive member is at least partly loosened from the body.

Abstract: Apparatus intended for bending heavy through thin wall pipe and tubing includes a generally circular bending shoe mounted for rotation about a first axis and having a plurality of semi-circular concave grooves in its outer surface. The grooves are of differing sizes and located in side-by-side axial spaced planes perpendicular to the first axis. A separate pair of bending rollers is provided for cooperation with each separate concave groove. Each pair of rollers includes a first roller and a second roller having concave exterior grooves and mounted on a bracket for independent rotary movement about separate second and third axes. A support arm is joined to the bracket for permitting tilting movement of the bracket relative to the support arm about a fourth axis parallel to the second and third axes.

Abstract: A gauge for fittings of the type including a coupling nut having a threaded internal opening and adapted to encircle a cylindrical member and a ferrule positioned on the cylindrical member, the gauge being used for determining the pull up of the ferrule and the swaging of the cylindrical member, includes an indicating unit having a readout for showing whether the swaging of the cylindrical member is within tolerances. A piston is movably mounted on the indicating unit and is operatively connected to the readout. The piston includes a body having a bore and an external threaded area on the body circumferentially of the bore to threadedly engage the threaded internal opening of the coupling nut carried on the cylindrical member. The piston further includes a section within the bore for aligning the cylindrical member with the bore and for limiting the extent of movement of the cylindrical member into the bore. A master is provided for calibrating the gauge.