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An escalator is a moving staircase – a conveyor transport device for carrying people between floors of a building. It is a stairway whose steps, moves continuously on a circulating belt or simply they are the moving stairs. They consist essentially of pivoted steps linked to each other and pulled along by an endless chain.
Escalators are used around the world to move pedestrian traffic in places where elevators would be impractical. Principal areas of usage include department stores, shopping malls, airports, transit systems, convention centers, hotels, arenas, stadiums and public buildings.
When you see an escalator, it may seem simple, but it is a complicated machine. It consist of a lot of Escalator Parts and components. Every part has its own function that makes the escalator works.
The core of an Escalator Parts is a pair of chains, looped around two pairs of gears. An electric motor turns the drive gears at the top, which rotate the chain loops. A typical escalator uses a 100 horsepower motor to rotate the gears. The motor and chain system are housed inside the truss, a metal structure extending between two floors.
Instead of moving a flat surface, as in a conveyer belt, the chain loops move a series of steps. The cool thing about an escalator is the way these steps move. As the chains move, the steps always stay level. At the top and bottom of the escalator, the steps collapse on each other, creating a flat platform. This makes it easier to get on and off the escalator. In the diagram below, you can see how the escalator does all of this.
Each step in the escalator has two sets of wheels, which roll along two separate tracks. The upper set (the wheels near the top of the step) is connected to the rotating chains, and so are pulled by the drive gear at the top of the escalator. The other set of wheels simply glides along its track, following behind the first set.
The tracks are spaced apart in such a way that each step will always remain level. At the top and bottom of the escalator, the tracks level off to a horizontal position, flattening the stairway. Each step has a series of grooves in it, so it will fit together with the steps behind it and in front of it during this flattening.
In addition to rotating the main chain loops, the electric motor in an Escalator Parts also moves the handrails. A handrail is simply a rubber conveyer belt that is looped around a series of wheels. This belt is precisely configured so that it moves at exactly the same speed as the steps, to give riders some stability.
The escalator system isn't nearly as good as an elevator at lifting people dozens of stories, but it is much better at moving people a short distance. This is because of the escalator's high loading rate. Once an elevator is filled up, you have to wait for it to reach its floor and return before anybody else can get on. On an escalator, as soon as you load one person to, there's space for another.
