Abstract: A tube assembly for an auxiliary heating and air conditioning system includes an inner tube extending longitudinally, an outer tube extending longitudinally and disposed over the inner tube, the outer tube including a plurality of ribs for locating the inner tube approximately concentric to the outer tube, at least one connector tube, and at least one connector interconnecting the at least one connector tube and the outer tube to allow fluid flow between the inner tube and the outer tube.

Abstract: A hose coupling comprising a metal tube and a cylindrical insert concentrically arranged and held fast within the tube. The tube includes a radially outwardly flared sleeve integral with the tube and providing a tube end and a stop shoulder at the juncture at which said sleeve is flared outwardly. The insert includes (i) a barrel portion extending substantially the full length of the insert and (ii) a radially outwardly flared integral collar at one end of the barrel portion. The collar has an end face abutting the tube stop shoulder, an opposed hose end face, and a tapered circumferential land engaging the sleeve and extending axially at an outwardly diverging uniform taper from the tube end face to the hose end face. The sleeve is preformed to include a circumferential seat portion for seating the collar with the seat portion diverging outwardly at a uniform taper equal to that of the collar and beginning at the tube stop shoulder and continuing to a point at least equal to the length of said collar.

Abstract: A tube coupling comprising a metal tube of relatively uniform thickness and having a radially outwardly expanded integral sleeve at one end thereof, and a radially extending tube shoulder being defined at the juncture at which the sleeve is expanded outwardly, the tube having a throughbore of a first inner diameter, and the expanded sleeve having a throughbore of a second inner diameter greater than the first inner diameter and concentric therewith. A cylindrical, hollow insert is located concentric with the axis of the tube, the insert including a radially extending annular collar at one end thereof. The collar has a tube end face abutting the radial tube shoulder and inertially welded to the tube at the interface of the tube end face and the radial tube shoulder. The insert includes at its other end a cylindrical barrel portion having hose locking and sealing means.

Abstract: An improved hose fitting assembly is disclosed which is designed for use in automotive air conditioning systems and is particularly well suited for use in such systems employing recently developed composite type hose which incorporates an inner liner of a thermoplastic material such as nylon or the like. The assembly comprises a resilient sealing member provided on the outer periphery of the fitting which is designed to sealingly engage the hose member and fitting to provide a positive seal therebetween so as to prevent loss of pressurized fluid such as refrigerant gas.