A technical engineering concept of a retractable metal shop rack with an expandable width mechanism. The structure has four vertical steel legs and a rigid base frame. The rack uses a scissor (lazy-tong) mechanism underneath to allow horizontal expansion from a compact state to a wide extended state. On top of the frame, there are multiple flat rectangular metal panels that slide outward on guide rails, maintaining a perfectly flat and continuous surface when extended. The design is shown in a clean CAD / SolidWorks style, with semi-transparent metal components, visible joints and pivot points, and clear mechanical structure. Include two states side-by-side: collapsed (compact) and fully extended (wide). Emphasize mechanical linkages, sliding rails, and structural steel tubing. Neutral lighting, white background, technical drawing aesthetic, high detail, engineering visualization. Mehr sehen