Multi-layered corrugated tubular article
AssigneeITI Scotland Limited
InventorJohn Peter Booth
Life of this patent
Estimating the term…
Abstract
The present invention provides a multi-layered corrugated cylindrical tubular structure formed from a strip (10) of material having one edge reduced in diameter by a step portion (16) and reduced in length by corrugations (18). The strip may be formed on a forming arrangement comprising confronting corrugating rollers (74, 76) having regions formed with corrugating undulations of differing height and an un-corrugated portion.
Claims34
A tubular article comprising one or more strips of self-overlapping helically wound strip material having a width W and length L and comprising two or more longitudinally extending potions and one or more longitudinally extending step portions therebetween, wherein one or more of said portions includes a plurality of corrugations extending across the width W thereof.
A tubular article as claimed in any one of claims 1 to 10 wherein the outer diameter portion is non-corrugated.
A tubular article as claimed in any one of the previous claims wherein said strip is curved towards a corrugated side thereof.
A corrugating mechanism comprising spaced apart confronting rollers, each roller having two or more axially adjacent axially extending portions having rolling surfaces and being mounted for rotation about a longitudinally extending parallel axes X1, X2, wherein one or more pairs of mutually confronting rolling surfaces are corrugated in anti-phase with each other, thereby to corrugate any material passing therebetween and wherein the height Hc of each corrugation increases between immediately adjacent axially extending portions.
A method of corrugating a strip comprising the steps of:
- i) providing a pair of spaced apart confronting rollers, each roller having two or more axially adjacent axially extending portions having rolling surfaces and being mounted for rotation about a longitudinally extending parallel axes X1, X2, wherein one or more pairs of mutually confronting rolling surfaces are corrugated in anti-phase with each other;
- and
- ii) driving a strip of material through a gap G between said rollers, thereby to cause said corrugated portions to deform and corrugate at least a portion of said strip;
- and
- iii) varying the corrugation height between adjacent corrugated portions.
Dependencies are inferred from the claim text.