Flexible corrugated tube

Claim 1

A flexible corrugated tube consisting of a succession of axially displaced convolutions obtained by spirally coiling a thin flexible metal strip formed with longitudinally extending corrugations, said corrugations being substantially of wave form, the waves having arcuate crests alternating with similarly shaped troughs, the borders of successive strip portions forming tube convolutions overlapping each other, with at least one trough, extending from one crest to another crest, and one crest, extending from one trough to another trough, of one corrugation in the overlapping border portion of a convolution fitting into one trough, extending from one crest to another crest, and one crest, extending from one trough to another trough, of a corrugation of the overlapped border portion of an adjoining convolution, characterized in that the width in cross section of at least those corrugations fitting into each other at said crests and at said troughs is greater than the width thereof at the portions thereof between said crests and said troughs so that said corrugations fitting into each other are interlocked to each other in the manner of hooks or teeth which engage each other.