Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1998-08-07
1999-09-28
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 464, 264154, 264259, 264267, 264273, B29C 4406, B29C 4412
Patent
active
059583150
ABSTRACT:
Convoluted tubing for automotive wiring harnesses and other elongated substrates is provided with sound dampening qualities by filling the valleys between convolutions with a flexible, resilient foamed composition, such as silicone rubber, and foaming the composition to cause expansion of the foam so that ribs of foam project radially from the valleys. In a preferred embodiment, spaced apertures are formed in the valleys to allow the expanding foam to form radially inwardly projecting fingers which contact the wiring harness and act to dampen vibrations. The corrugated tubing may be axially slit and the slit allowed to be filled with the foamed composition which, when foamed, eliminates noises caused by movement of the edge surfaces of the slit when torsional forces are applied to opposite ends of the tube.
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Fatato Francis B.
Martin Lee H.
Federal-Mogul Systems Protection Group, Inc.
Kuhns Allan R.
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