Dual coil tubing assembly

Pipes and tubular conduits – Plural duct – Longitudinally extending common wall

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Details

138118, F16L 1100

Patent

active

060986662

ABSTRACT:
A tubing assembly for conveying fluid under pressure such as from a source of air pressure in a vehicle to an airbrake system of the vehicle. The assembly includes a flexible first and second tubing member, each having an outer surface and extending axially from a forward distal end to a rearward distal end. The first tubing member is wound intermediate the forward and the rearward distal end thereof radially about a generally cylindrical surface to define a first expandable, self-retracting coil portion having a plurality of first turns. The second tubing member, in turn, is wound intermediate the forward and the rearward distal end thereof radially about the cylindrical space to define a second expandable, self-retracting coil portion disposed within the curve of the cylindrical surface space as extending parallel to the first coil portion and as having a plurality of second turns. With each of the second turns of the second coil portion being disposed adjacent a corresponding one of the first turns of the first coil portion, a unitary sheathing member is provided to commonly surround the first and the second tubing members as extending intermediate the forward and the rearward distal ends thereof. As surrounded by the sheathing member, each of the second turns of the second coil portion is thereby paired for mutual axial movement with a corresponding one of the first turns of the first coil portion as the first and the second coil portion are extended and retracted.

REFERENCES:
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Parker Fluid Connectors Catalog 4660 for Parflex Thermoplastic Hose, Tubing, Fittings and Accessories, dated Dec. 1993.
Parker Fluid Connectors Bulletin 4452-B14 for Parker Brake Coil, Tractor/Trailer Coiled Air Brake Hose Assemblies, dated Jan. 1979.
Parker Fluid Connectors Bulletin 4452-B16 for Duo-Coil Tractor/Trailer Coiled Air Brake Assembly, dated Jan. 1994.
Undated literature for Tectran's Magnum Dual-Line Armorcoil System.

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