Abstract: A tubular fluid conduit which is especially adapted for use in supplying pre-conditioned air to an aircraft being serviced, wherein the tubular conduit may be fabricated as a thermoplastic extrusion having a constant diameter dimension, whereby a first end portion may be fluidically connected to a large diameter supply conduit while a second end portion may be fluidically connected to a small diameter use conduit as a result of spiral wrapping the second end portion around the use conduit. Alternatively, the tubular conduit may be fabricated as a thermoplastic extrusion having repetitive sections with each section comprising relatively large diameter and relatively small diameter portions.

Abstract: A tubular fluid conduit, for conducting pre-conditioned air to an aircraft, is fabricated from a single, continuous strip of material which has a predetermined width dimension and first and second fasteners disposed upon the oppositely disposed longitudinally extending side edge portions of the strip of material. The strip of material is coiled in a spiral manner into a tubular configuration along its longitudinal length, and the first and second fasteners, disposed upon adjacent edge portions of sequentially coiled sections of the tubular conduit, are mated with each other so as to fasten together the sequentially coiled sections of the tubular conduit. The tubular conduit may have any predetermined length dimension, depending upon the number of sequentially coiled sections that are formed, and may also have any predetermined diametrical extent depending upon the size and configuration of the sequentially coiled sections.

Abstract: An expansible and collapsible tubular conduit, which is especially adapted for use in supplying pre-conditioned air to an aircraft while the aircraft is located upon the ground and is being serviced, comprises a plurality of annular fabric membranes which are connected to the opposite sides of a plurality of annular structural dividers or frame members in a continuously repetitive alternating manner. The structural combination or assembly comprising the fabric membranes and the structural dividers or frame members renders the tubular conduit readily expansible and contractible in the form of a spring or accordion so as to be capable of being easily and rapidly deployed and stowed, as well as to be capable of being stored in a relatively compact state or mode.

Abstract: A power delivery system for parked aircraft includes protective rings on the power cords. These protective rings protect the power cord jackets from wear and facilitate movement of the power cords across the ground. The rings may be configured for securement to the cable so as to compress the insulative jacket of the cable somewhat, thereby firmly maintaining the rings in place on the cable. The rings may be formed of two identical elements that are joined to envelope the cable. The rings may accommodate both round insulated cable, as well as bundled cable.