Elevator is refers to the service in several specific floor within the building, its capsules with plumb line in at least two columns perpendicular to the horizontal plane or slope Angle is less than 15 ° rigid orbit transportation equipment permanently. There are also terraces, which run continuously on the track, commonly known as escalators or automatic walkways. Fixed lifting equipment for the specified floors. Vertical elevator has a car, running on at least two columns of the vertical or Angle is less than 15 ° between the rigidity of rail. The cage size and structure are convenient for passengers to enter or unload cargo. Traditionally, the elevator is used as the general term for vertical transportation vehicles in buildings, regardless of their driving methods. Speed can be divided into low-speed elevators (4 m/s below), rapid elevator 4 ~ 12 m/s) and high speed lift (12 m/s). Hydraulic lifts began to appear in the mid-19th century and are still being used in low-rise buildings. In 1852, the United States of Otis developed a safety lift for wire rope lifting. In the 1980s, the driving device was further improved, such as the winding drum and the balance weight of the motor through worm drive. At the end of the 19th century, friction wheel drive was adopted to greatly increase lift height.
The elevator adopt permanent magnet synchronous tractor as power in the late 20th century. It has greatly reduced the space of the machine room, and has the advantages of low energy consumption, high efficiency and fast improvement, which has greatly contributed to the development of real estate to super high level.
Thyssenkrupp elevator company has developed a new type of "multiple elevators" that can operate vertically.
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