Frame assembly having increased torsional rigidity

摘要

A frame assembly having improved torsional rigidity may comprise a generally rectangular horizontal base member having a first vertical side wall and a second vertical side wall located on opposite sides of the horizontal base member. The horizontal base member also includes a third vertical side wall located between the first and second vertical side walls. A horizontal guide platform extending from the third vertical side wall lies in a plane that is substantially parallel to a plane containing the horizontal base member. A C-shaped guide rail is attached to the horizontal base member opposite the third vertical side wall.