Electric stairs by Tamara
Electric stairs (also known as escalators) are moving staircase – they are a great device for carrying people between floors of a building. The device consists of a motor -driven chain of individually linked steps that move up or down.
Electric stairs are used around the world to move pedestrian traffic in places where elevatorswould be impractical. Principal areas of usage include department stores, shopping malls, airports, transit systems, convention centers, hotels, arenas, stadiums, train stations (subways) and public buildings.
Nathan Ames, a patent solicitor from Saugus, Massachusetts, is credited with patenting the first "escalator" in 1859, despite the fact that no working model of his design was ever built.
In 1889, Leamon Souder successfully patented the "stairway", an escalator-type device that featured a "series of steps and links jointed to each other".