![]() ![]() Hydraulic elevators use the principal of hydraulics to pressurize an above-ground or in-ground piston to raise and lower the car. The friction between the ropes and the pulley furnishes the traction that gives this type of elevator its name. Sometimes two elevators always move synchronously in opposite directions, and they are each other's counterweight. The weight of the car is balanced with a counterweight. ![]() In a "traction" elevator, cars are pulled up by means of rolling steel ropes over a deeply grooved pulley, called a “sheave” in the industry. In the past, elevator drive mechanisms were powered by steam and water hydraulic pistons. A modern day elevator 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"). ![]() An elevator is essentially a platform that is either pulled or pushed up by a mechanical means. There are even designs for a “space elevator” that will be able to lift cargo and passengers into Earth’s upper atmosphere.Įlevators began as simple rope or chain hoists. lifting aircraft to the flight deck of an aircraft carrier.
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