Method and apparatus for a quick-change caster system for removing and replacing the casters which are used to support articles such as steel racks, containers, crates and the like. An intermediate frame video is formed from an original interlaced field video. The compressed air is injected into the vortex tube producing a heated stream of air and a cooled stream of air. In fact, unexpected events can be readily noted. The vector and the plane define a first angle when the back support is in the upright position and a second angle when the back support is in the rearward tilt position, wherein the second angle is closer to ninety degrees than the first angle.