safety elevator

…Elisha Graves Otis, introduced a safety device in 1853, he made the passenger elevator possible. Otis’ device, demonstrated at the Crystal Palace Exposition in New York, incorporated a clamping arrangement that gripped the guide rails on which the car moved when tension was released from the hoist rope. The first…

…an American inventor of the safety elevator.

…Graves Otis developed the first safe steam-powered roped elevators with toothed guide rails and catches in the late 1850s. The steam-powered hydraulic elevator, which was limited to buildings of about 15 stories, was developed in 1867 by the French engineer Léon Édoux. The development of the electric motor by George…