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📘 An escalator is a loop of linked steps

Watch steps flatten at the top, disappear, and return at the bottom — one linked chain, not separate platforms.

3
lessons
~15 min
to learn
Adults
level
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What you’ll learn

  1. The escalator's moving frameIdentify the truss, tracks, steps, rollers, and synchronized handrail loop.An escalator is a guided chain of linked steps supported by a structural truss and several coordinated rolling paths.
  2. How the drive pulls the stepsExplain how a motor, shaft, sprockets, chains, and rollers transmit motion.The motor turns a shaft; matching sprocket teeth engage the step chains, while rollers guide and orient the loaded steps.
  3. The hidden return pathTrace one step from the passenger run through the transitions, end station, and underside return.Steps circulate through a closed loop whose end stations flatten, turn, and return them for another trip.

Questions this course answers

What pulls the linked steps around the escalator?

The motor turns a drive shaft, whose sprockets mesh with and advance the step chains.

Why does an escalator use separate roller paths?

The chain supplies pulling force while guide tracks and rollers shape the step's position and levelness.

What happens after a step leaves the passenger run?

The step remains attached to the circulating chain and is redirected through the underside return run.

Grounded in trusted sources

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