mechanical linkage 3d model

Hand-drawn technical schematic on white paper, engineering notebook style. Central vertical square bar, 1 m long, labeled L = 100 cm, with 8 identical spring-loaded linkage mechanisms mounted radially around it at 45° intervals. Each mechanism: vertical rectangular spring housing containing a spring labeled “spring” with S = 5 cm; a blue pivot pin at the bottom of the spring; two diagonal links labeled l = 15 cm connecting the upper and lower pivot pins to a spoked wheel labeled “Wheel”; lower pivot pin at the bottom of the housing. Red ink dimension lines and handwritten annotations: d = 3 cm, R = 5 cm, r = 8 cm. Labels: “8 identical mechanisms (placed every 45°)” at top and “Bar (1 m) with mechanism shafts welded in parallel” at bottom. Black ink outlines, blue pivot pins, red dimensions, rough hand-drawn lines, 2D orthographic assembly drawing, white background, no shading. Negative prompt: 3D render, photorealistic, shading, gradients, metallic materials, perspective, CAD render, s