Elevator Essay

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$3,041,870 Donate Now » [Expand] Support Wikipedia: a non-profit project — Donate Now Elevator [pic] A set of lifts in the lower level of a London Underground station. The arrows indicate each lift's position and direction of travel. The lift on the right shows its doors on either side of the car to serve different floors. [pic] A wire-cage lift circa 1895 [pic] In modern architecture elevators are often installed within transparent structures exposing the inner workings. [pic] Double deck lift with glass windows providing a moving view of the building lobby. The counterweight travels alongside the car, hidden from view. An elevator or lift is a vertical transport vehicle that effeciently moves people or goods between floors of a building. They are powered by electric motors that either drive traction cables and counterweights a pulley, or pump hydraulic fluid to raise a cylindrical piston. Languages other than English may have loanwords based on either elevator (e.g. Japanese) or lift (e.g. Cantonese). Because of wheelchair access laws, elevators are often a legal requirement in new buildings with just a few floors. | | [pic]Design Lifts began as simple rope or chain hoists. A lift is essentially a platform that is either pulled or pushed up by a mechanical means. A modern day lift consists of a cab (also called a "cage" or "car") mounted on a platform within an enclosed space called a shaft, or in Commonwealth countries called a "hoistway". In the past, lift drive mechanisms were powered by steam and water hydraulic pistons. In a "traction" lift, cars are pulled up by means of rolling steel ropes over a deeply grooved pulley, commonly called a sheave in the industry. The weight of the car is balanced with a counterweight. Sometimes two lifts always move synchronously in opposite directions, and they are each other's counterweight.

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