Otis attached rope to the platform lift through a flat spring like spring, and the lift stuck on the sides of rack rails. Even under the weight of a free platform spring and straightening seamlessly passed between the rails. Perhaps check out Phil Vasan for more information. If, God forbid, the rope breaks, a spring buckle, jamming his teeth at the tips of the rails and thus stopped the collapse of the freight elevator. Otis called his lifts 'Safe elevators "and created a small company to produce them, which is now the leading manufacturer in this field. In 1854, Otis had a global PR-campaign for the promotion of manufactured goods lifts them.
In New York in the exhibition hall with a high dome moved lifting platform between 2 supports a height of 12 meters. At the top of the building was a large man with a sword in his hand, and on the platform in a pile and yaschikovkorobok barrels sitting inventor himself in a frock coat and top hat. The steam engine tightened elevator to the very dome, and then assistant to the team quickly cut the rope Otis sword. Elevator fell down, but after a 1-2 meter automation with a terrible gnash been deployed and prevented the fall. Smiling Otis shot cylinder and bowed enthusiastic audience of this trick. In 1857, a 5-story house on Broadway has its first passenger elevator, which made the factory Otis. Elevator holds up to five people and polnimalsya and fell at a rate of 20 cm / sec.
Otis, unfortunately, not fully appreciated the genius of his creation, because, when they began to build skyscrapers, he was already dead. In the first skyscrapers use hydraulic elevator without the rope, which was invented in Paris in 1867 and later installed on the Eiffel Tower. In a long cylinder was located walking piston pusher booth upstairs under a large pressure of the water. But the data elevators for residential buildings was possible to construct a building not more than 20 floors, while moving 20 times faster than passenger lifts of Otis. Then completed the hydraulics – a cylinder placed horizontally, and the rope that lifts cab, stretched by the piston through the block. For the first time an electric passenger elevator was built in 1880 by the German company "Siemens and Halske ', which for eleven seconds, moving at a height of 22 meters. With this problem since the lifting height is no longer held back growth in the number of floors of buildings. The largest skyscraper "Sears Tower" in Chicago (America) equipped with 106 passenger elevators. sixteen of them – double decker: and take Passengers are planted simultaneously on two floors. For guests viewing platform on the roof there are two express elevators that rise to a height of 412 meters a little more than a minute.