Patent ID: 7028441

Claim:
A structural member ( 1 ) having a generally U-shaped cross-section, an inner side and an outer side and a longitudinally extending configuration, comprising a base portion ( 2 ) and two leg portions ( 3 ) extending at substantially right angles from said base portion, said structural member comprising at least one corrugated portion and each leg portion ( 3 ) including a first section ( 3 a ) forming an inner wall of the leg portion and a second section ( 3 b ) parallel with said first section and joining the first section along a first joining line ( 4 ) and the base portion along a second joining line ( 5 ) characterized in that said structural member is formed as a unit from at least one thin sheet or foil which is corrugated in a continuous waveform in the longitudinal direction of the member; and that the corrugations on the outer side of the structural member are partly cut along the first joining line ( 4 ) that form gaps ( 11 ) , the first section and the second section being connected with each other at longitudinal edges of the gaps.