Patent ID: 6418971
Filing Date: 2002-07-16
Classification: F16L

Abstract:
A flexible metal conduit constructed from a single thin metal ribbon arranged in a helix about a longitudinal axis, convolutions of the helix disposed adjacent each other to form a single ply conduit wall 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 helically along the conduit, a first ribbon edge region defined by a partial corrugation and a flange extending radially from the partial corrugation, a second ribbon edge region defined by a second partial corrugation and a second flange extending radially from the second partial corrugation, said first and second partial corrugations abutting to form a composite single ply corrugation, the abutment location of said flanges defining a seam running along the convolution junctures on one of said conduit surfaces, said first and second edge flanges abutting at the seam and extending radially therefrom to an interlock structure by which said flanges are secured together.