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Elevators are elevators that serve specific floors in a building.


An elevator is a permanent transportation device that serves several specific floors in a building and whose car runs on at least two rigid rails that are perpendicular to the horizontal plane or inclined at an angle of less than 15° to the plumb line. There are also step-type elevators, where the treads are mounted on crawlers and run continuously, commonly known as escalators or moving walkways. A fixed lifting device that serves specified floors. A vertical lift has a car that runs between at least two rigid rails that are perpendicular or inclined at an angle of less than 15°. The size and structure of the car facilitate passengers to enter and exit or load and unload goods. It is customary to use elevators as a general term for vertical transportation tools in buildings regardless of their driving mode. According to speed, they can be divided into low-speed elevators (below 4 meters/second), fast elevators (4 to 12 meters/second) and high-speed elevators (above 12 meters/second). Hydraulic elevators began to appear in the mid-19th century and are still used in low-rise buildings. In 1852, E.G. Otis of the United States developed a safety elevator for wire rope lifting.