Leonardo da Vinci designed cranes to lift and move heavy loads. His notebooks contain studies of hoists, winches, gears, and rotating lifting machines intended for construction and engineering work. Some designs were powered by people or animals, while others used mechanisms such as treadwheels and gear trains.
A crane raises a load vertically and can also move it horizontally or rotate it. Leonardo’s interest in cranes reflected the practical needs of Renaissance building projects, including the movement of stone, timber, and other heavy materials. He carefully examined how mechanical advantage could reduce the force required from workers.
Leonardo did not invent the crane. Ancient civilizations already used lifting devices, and medieval builders employed cranes in construction. His contribution was the detailed analysis and improvement of mechanisms, often combining pulleys, gears, drums, and counterweights.
The crane designs should also be distinguished from Leonardo’s hydraulic machines. Hydraulic devices use moving water, whereas the lifting machines in these studies primarily transform human or animal effort into controlled mechanical motion.