The Invention And Development Of Elevators
In 1853, at the world's fair at the crystal palace in New York, American eliza Griffith Otis showed his invention to the world for the first time. He stood on the elevator platform, full of goods ordered assistant pull platform up to the height of the audience can see, then sends a signal, the assistant with the ax cut off the elevator lift cables. Surprisingly, the elevator didn't crash, but was firmly fixed in midair -- the elevator safety device invented by Mr. Otis played a role. "All safe, gentlemen." Mr. Otis, standing on the platform, waved to the crowd. No one would have thought that this was the first safety elevator in human history.
Human beings have a very long history of transporting goods and personnel by means of lifting tools. As early as 2600 BC, when the egyptians build the pyramids with the rise and fall of the original system, there has been no change of the basic principle of the system: that is, a counterweight falling at the same time, the load platform. Early lifting tools were basically powered by manpower. In 1203, a donkey powered crane was installed in a monastery near the French coast, which ended the history of carrying heavy objects with human hands. When British scientist watt invented the steam engine, the crane began to use steam as power. Following in the footsteps of William Thomson, he developed a hydraulically powered elevator that was powered by water. On the basis of these elevators, generations of innovative engineers continue to improve the elevator technology. However, a key security problem has never been solved, which is that when the lift lift cable breaks, the load platform is bound to crash.
Mr. Otis's invention completely rewrote the history of the use of tools. From then on, the elevator ride was no longer a "game for the brave", and the elevator was widely used worldwide. In December 1889, the United States Otis elevator company created a veritable elevator, it USES the dc motor as the power, through the worm gear reducer drive winding rope on the drum, suspension and lifting capsules.
Life goes on, technology is developing, elevators are improving. For 150 years, the material of the elevator by black and white to color, style by the straight type to the oblique type, particularly in handing control of the new step by step - handle switch control, push button control, signal control, collection control, man-machine dialogue, etc., still appeared many elevators in parallel control, intelligent group control; The double-decker cage elevator shows the advantages of saving the shaft space and improving the transportation capacity. The appearance of the variable speed escalator greatly saves the time of pedestrians. Different shapes -- fan, triangle, half-diamond, semicircle, and round trip elevator make the sight of the passengers in it no longer closed. FM door control, intelligent remote monitoring control cabinets, host, energy saving, low noise and durable, composite steel belt environmental protection - a leisurely contributions of the human in the field of mechanical, electronic, optical and other latest scientific research achievements of new elevator to come out, cold buildings scattering humanity, therefore, the life of people so better.