GRAVITY ELEVATOR

The utility model relates to an elevating tool with gravitational potential energy as a whole or a main power source, which is mainly composed of a power conversion device, an energy storage device and a safe speed limit device. An air adjusting air compressor is used for storing the gravitational potential energy of a potential energy elevator in a high pressure air storage can. Compressed air stored in the air storage can acts on a bidirectional controllable piston rod under the control of an electric control valve. An adjustable rod chain is driven for drawing a litter compartment to rise and drop. The speed limit device is composed of a speed limit piston barrel, a small energy storage box and an oil storage barrel. The potential energy elevator makes use of the gravitational potential energy for all or mostly replacing the dynamic electric energy of elevating vehicles of various elevators, electric staircases, etc., and saves large quantity of energy.