Foam coated convoluted tubing

Details Foam coated convoluted tubing Foam coated convoluted tubing

H - Electricity

02

G

H02G 3/04 (2006.01) F16L 9/21 (2006.01) F16L 11/118 (2006.01) F16L 55/033 (2006.01)

Patent

CA 2292507

Convoluted tubing (10) for automotive wiring harnesses and other elongated substrates is provided with sound dampening qualities by filling the valleys (20) between convolutions (18, 20) with a flexible, resilient foamed composition, such as silicone rubber, and foaming the composition to cause expansion of the foam so that ribs (22) of foam project radially from the valleys. In a preferred embodiment, spaced apertures (26) are formed in the valleys (20) to allow the expanding foam to form radially inwardly projecting fingers (24) which contact the wiring harness and act to dampen vibrations. The corrugated tubing may be axially slit (16) 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 (14).

Ce tube en spirale (10) pour rampes électriques de câblage d'automobile et autres substrats de forme allongée est doté de propriétés d'insonorisation du fait du remplissage des vallées (20) se trouvant entre les circonvolutions (18, 20) par une composition en mousse, souple et élastique, du caoutchouc de silicone notamment. Le moussage de la composition entraîne son expansion de telle sorte que des nervures (22) de mousse saillent, sur un plan radial, des vallées. Dans une réalisation préférée, des ouvertures séparées (26) sont ménagées dans les vallées (20) pour permettre à la mousse en expansion de constituer des doigts (24) se projetant radialement vers l'intérieur et qui, venant au contact du câblage, amortissent les vibrations. Ce tube annelé peut être fendu sur un plan axial et la composition en mousse, en remplissant ces fentes, contribue à éliminer le bruit causé par le mouvement des surfaces périphériques des fentes lorsque des forces de torsion s'exercent sur les extrémités opposées du tube.

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