Flexible metal conduit

F - Mech Eng,Light,Heat,Weapons – 16 – L

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Details

F16L 11/15 (2006.01) B21C 37/12 (2006.01) F16L 11/16 (2006.01)

Patent

CA 2392857

A flexible metal conduit is disclosed that comprises a thin metal ribbon arranged in a helix about a longitudinal axis. Convolutions of the helix are disposed adjacent each other with the ribbon defining helical, sinuously corrugated inwardly and outwardly facing conduit surfaces forming radially inner and radially outer apices that are spaced substantially evenly apart and extend parallel to the convolution edges. A first ribbon edge region is defined by a partial corrugation and a flange extending radially from the partial corrugation. A second ribbon edge region is defined by a second partial corrugation and a second flange extending radially from the second partial corrugation. The first and second partial corrugations abut to form a helical seam running along the convolution junctures. The first and second edge flanges abut at the corrugation seam and are interlocked to secure the convolutions together. The flanges are tightly rolled together to form a bead-like structure having a generally circular cross sectional shape. The composite corrugation has a radially inner apex, with the flanges interlocked radially outwardly from the radially inner apex.

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