US Patent 11819774 Model construction set

A construction set for erecting structures that can be assembled and disassembled. Functional capabilities of a construction set are expanded, which makes it possible to assemble a high-strength structure. Blocks with a square cross-section having faces of different widths and lengths, identical circular apertures, and an internal longitudinal passage are provided, for connection in a longitudinal and a transverse direction to form angles that are rigidly and movably connected. The blocks are made of square tubing of compatible standard sizes. Auxiliary parts are produced by cutting away an end face of a block, making it possible to use the blocks as pivotable levers and to use a unified fastening connective element as a pivot pin, where the position of one of the blocks changes along spherical coordinates relative to the conjugation point.