US Patent 10029734 Rocker insert formed by connected tubular members

An elongated beam, or rocker assembly, is disclosed that includes a first panel and a second panel attached to the first panel to define a cavity. A reinforcement is disposed in the cavity that includes a first tubular member adhesively connected to the first panel inside the cavity and a pair of tubular members are connected with an adhesive to the second panel, to each other, and the first tubular member. The tubular members are arranged in a triangular array within the cavity and extend along the length of the elongated beam. The wall thickness and bending strength of the tubular members are selected to provide an insert that collapses preferentially with the outer tubular member of the insert collapsing before the inner tubular members.