Wikipedia
Beltri
The BELTRI, or "Balance Elevator-Lift for Tractioning Recumbent Individuals" is an apparatus designed for the mobilization of bedridden patients. It consists of a metallic structure with pulleys and ropes, that uses a counterbalance to lift the weight of a patient without difficulty. It was first introduced in Austria in the 19th century by Dr. Carl Emmert and is now used throughout the world by many nurses and physicians.