| 摘要 |
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.
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