Patent attributes
An energy management structure includes an elongated polygonal tube with at least four walls, the tube having a larger first end and a smaller second end, at least two of the walls including a longitudinally-extending channel-shaped tapered rib starting at the smaller second end and extending toward the larger first end. The ribs become shallower near the larger first end. The walls include crush initiators so that the ribs do not provide undesired strength to the tube during a longitudinal impact. A related method includes roll-forming a polygonal tubular shape with at least four walls, at least two of the walls including longitudinally-extending channel-shaped ribs, and reforming the tubular shape into a tapered polygonal shape with a larger end and a smaller end, the ribs becoming shallower as the ribs extend closer to the larger end.
