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2007-01-17 02:32:39 · 5 answers · asked by Mahmud N 1 in Science & Mathematics Engineering

5 answers

Up and down.

2007-01-17 02:37:35 · answer #1 · answered by Anonymous · 0 0

An elevator is a transport device used to move goods or people vertically. Outside North America, elevators are known more commonly as lifts. Other languages may have loanwords based on either elevator (e.g. Japanese) or lift (e.g. Cantonese). Because of wheelchair access laws, elevators are often a requirement in new buildings with multiple floors.

Elevators began as simple rope or chain hoists. An elevator is essentially a platform that is either pulled or pushed up by a mechanical means. 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 English called a "hoistway". In the past, elevator drive mechanisms were powered by steam and water hydraulic pistons. In a "traction" elevator, 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 elevators move always synchronizedly in opposite direction, and they are each other's counterweight.

2007-01-18 01:14:33 · answer #2 · answered by Einstein 2 · 0 0

Traction elevators use a car, a counterweight, cables, pulleys, and motor. The rails are typically placed at the sides of the car with the couterweight behind, although there are plenty of variations depending on building design. The motor is typically placed directly over the elevator shaft, and pulls the car up the shaft. There's also a variety of safety mechanisms that will prevent the car from falling, both electrical and mechanical. You will find traction elevators in buildings over four stories.

Hydraulic elevators use a car, a piston, hydraulic fluid, and a hydraulic motor. Again, the rails are typically placed at the sides of the car. The piston pushes the car up the shaft; no counterweights are required. Due to the buckling load on the piston, hydraulic elevators are limited to low-rise buildings. Of course, the bigger the piston, the higher the elevator can travel.

2007-01-17 10:43:39 · answer #3 · answered by wheresdean 4 · 0 0

weights and counter weights and a pully and a moter

2007-01-17 10:35:46 · answer #4 · answered by Anonymous · 0 0

find it all here!

2007-01-17 10:42:47 · answer #5 · answered by desT 2 · 1 0

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