Abstract: A joint between a side rail and a cross member in a vehicle body and frame assembly provides for direct positive positioning of the side rails relative to the ends of the cross members to expedite the manufacturing process. The side rail is generally C-shaped in cross section, including a generally vertically extending web portion having upper and lower flange portions extending therefrom. The upper flange portion is formed having a longitudinally extending, generally U-shaped recess, while the lower flange portion is formed having a longitudinally, extending generally inverted U-shaped recess. The cross member includes an upper cross member having an end portion composed of a flange portion that terminates in a generally U-shaped protrusion. The flange portion of the upper cross member extends across the upper surface of the upper flange portion of the side rail, while the U-shaped protrusion is received in the U-shaped recess.

Abstract: An adjustable mechanism for supporting an article, particularly for use with an article transportation system, is disclosed. The support mechanism includes a closed cylinder having a movable piston disposed therein. The piston divides the interior of the cylinder into upper and lower closed chambers. A pair of oppositely oriented pressure relief valves are disposed in the piston to selectively permit fluid communication between the upper and lower chambers. The pressure relief valves open only when the pressure differential exerted thereacross exceeds a predetermined value such that the piston is normally locked in position within the cylinder. A first rod is connected to the piston and extends upwardly out of the cylinder. An article engaging platform is secured to the upper end of the upper rod. A second rod is also connected to the piston, extending downwardly out of the cylinder.