Tubular bodies and methods of forming same
AssigneeITI Scotland Limited
InventorsJohn Peter Booth, Gordon David Lovis
Life of this patent
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Abstract
A tubular body comprises an inner hollow core and an outer casing of one or more strips of self mechanically inter-engaging helically wound material having a higher yield strength than that of the core material. Also provided is a method of forming the tubular body comprising the steps of winding the outer core onto the inner core and an end connector for use with said tubular body when said body is provided with helically extending detents on an outer surface thereof.
Claims50
A tubular body comprising an inner hollow tubular metal core and an outer casing, wherein the outer casing has at least one metal strip of mechanically inter-locking, self overlapping helically wound material having a higher yield strength than that of the inner core, wherein interlocking prevents relative axial movement of successive convolutions of the at least one metal strip, said at least one metal strip includes an indent and a detent, said indent and said detent configured to interengage on successive convolutions to exert a compressive force on said core after said core has been plastically expanded.
A tubular body comprising an inner hollow tubular metal core and an outer casing, wherein the outer casing has at least one metal strip of mechanically inter-locking, self overlapping helically wound material having a higher yield strength than that of the inner core, an inner surface of said outer casing is in continuous contact with an outer surface of said core, wherein interlocking prevents relative axial movement of successive convolutions of the at least one metal strip, said at least one metal strip includes an indent and a detent, said indent and said detent configured to interengage on successive convolutions to exert a compressive force on said core after said core has been plastically expanded.
Dependencies are inferred from the claim text.