Elevator history from Archimedes to Dubai Burj

Egypt Pyramid Giza group is one of the seven wonders of the world.Khufu Pyramid is the biggest and most preserved one,which is 146.6 meters high, and 230.5 meters long.It is made up of about 2000000 pieces of stone, each stone weighing 2.5 tons to 15 tons.According to multi inference, to transport such a huge amount of stone to the top of the pyramid, and finish the building in a few decades,it need more than 100 thousand human to work together.

Human society has the need of vertical transportation for a long time.In ancient Greece, Archimedes improved the lifting device with pulley and rope as the main component.He designed a drum hoist driven by the human, it is regarded as the originator of modern elevator.BC 100 years Chinese appeared shaduf and windlass they are composed of a lever, the evolution of the drawing tools, and popular in the spring and autumn period.80 BC, the gladiators and animal who ride lifting equipment very primitive from the ground up to the colosseum.

In 1203, a monastery near the French coast made a huge wheel tread.Through the rope winding in solid pillars, the donkey provides motivation to lift weight.During this period, the lifting of heavy equipment is mainly used for agricultural production and life.By eighteenth Century, the mechanical power was applied to the elevator

 The romantic Louis fifteen gives it a new function: he has built a private "flight ladder" in Palace of Versailles to meet his mistress on the high floor.

But so far, the elevator was still a fundamental safety hazard: once the cable fault, the load platform will crash.Fortunately, in 1852, the American Elisha Graves Otis solved the problem.He installed a special spring buffer at the top of the lifting platform, which was connected with the traction rope.When the elevator is suddenly falling or the spring buffer is hit, the safety device is touched by the spring force, and the guide rail is clamped.This is the world's first steam engine as a driving force, equipped with a safety device of manned lift

After the research and innovation of generations, the security system of the elevator is quite perfect right now.The safety device of the modern elevator includes the brake, the governor, the brake and the buffer, the more advanced elevator may also have the earthquake sensing device and so on.These safety facilities have been many angles to consider testing, to ensure that the elevator speed can be controlled, in order to protect the passengers in the elevator.

In fact, let the public have confidence in the safety of the elevator, it is another important contribution from Otis.In 1857, a New York Broadway department store firstly used an elevator Otis invented.The mall is only 5 floors high, the elevator running speed of 40 feet per minute.Today, the tallest building in Dubai, Harry Fatah (also known as Burj Dubai), 828 meters high, along with a total of 169 layers of underground.A total of 56 al  passengerelevators and freight elevator is running in the building , the average speed can reach 10 meters per second.