Retractable umbrella structures have experienced a great development over the past decades. Technological advances have made it possible to create ever more sophisticated structures, with increased spans. As a result of a long development process, the optimization of structures has achieved the highest level by now, but the opening-closing process is quite complicated with very complex kinematics and steel structure. The umbrella structure suggested by this work is based upon a new operational principle, which significantly simplifies it. The innovativ solution is a use of bended composit...