| 摘要 |
Small diameter, normally straight tubes, some having discharge ports distributed along their lengths, and some being imperforate, are detachably connected in selected orders to form an elongated dispensing pipe line which is connectable at one end to a source of fluid under pressure and is plugged at the other end. The tubes are readily flexible transversely of their axes into curvilinear shapes throughout a wide range of radii, ranging from about 6 inches upwardly, by forces applied by the hands of an operator while his hands directly grip the tube. The tubes retain their normal cross sectional shape when so curved. They are of a plastic material having a good memory so that they are self-restoring or readily restorable manually to original lineal condition by reverse bending by hand. They are highly resistant to permanent or elastic deformation, or radial collapse, of their cross section. The tubes are so fully resistant to torsional deformation by manually applied forces and the coupling between the tubes hold the tubes so tightly that an operator, by applying rotational or torsional forces to any one of the tubes manually while gripping it directly in his hands, can rotate the entire line as a unit with each tube retaining its fixed rotated position relative to the others.
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