Flexible metal conduit and method of making the same

Details Flexible metal conduit and method of making the same Flexible metal conduit and method of making the same

F - Mech Eng,Light,Heat,Weapons

16

L

F16L 11/15 (2006.01) B21C 37/12 (2006.01) B21D 51/12 (2006.01)

Patent

CA 2065196

A flexible metal conduit and fabrication method where a thin metal ribbon is arranged in a helix about a central axis. The ribbon defines helically extending corrugated inwardly and outwardly facing conduit surfaces formed by alternating ridges and valleys extending parallel to the ribbon edges. Ribbon edge locking structure secures abutting ribbon convolutions together and comprises first and second confronting parallel ribbon edge flanges extending at least a substantiallength of the ribbon. The flanges are lapped and tightly rolled together to form a two ply spirally curved wall defining a tube whose central core has a generally circular cross sectional shape. The tube is disposed adjacent a convolution surface and extends along a helical path parallel to the abutting convolutions.

Cette invention concerne une canalisation métallique souple et la méthode de fabrication de celle-ci qui consiste à enrouler en spirale autour d'un axe longitudinal un mince ruban de métal ondulé. Le ruban spiralé définit une canalisation à paroi ondulée présentant des creux et crêtes alternés parallèles aux rives longitudinales dudit ruban. Les spires adjacentes sont assemblées à agrafures formées à partir de rebords longitudinaux parallèles et jointives sur sensiblement toute la longueur du ruban. Imbriqués à chevauchement, ces rebords sont rabattus et roulés à force pour former une paroi spiralée bicouche définissant un tube de section intérieure généralement circulaire. Ce tube se trouve du côté extérieur du conduit et suit une trajectoire spiralée parallèle aux ondulations du conduit.

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