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📘 How does an escalator circulate steps?

Follow chains, sprockets, rollers, tracks, and the hidden return path inside an escalator.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

Start the course →

What you’ll learn

The loop
Step chain
Step rollers
Drive
Handrail
Comb plates
Tracks and turns
Safety devices
Load and wear
The complete cycle

Questions this course answers

What keeps escalator steps connected and evenly spaced?

Twin continuous chains attach the steps and carry them around the loop.

What do step rollers and tracks do?

Rollers follow shaped tracks that keep treads level and guide the turns.

What does the main motor drive?

Motor torque reaches the step chains through the gearbox and drive sprockets.

Why is a comb plate installed at a landing?

Comb teeth fit the tread grooves at the transition between moving and fixed surfaces.

What should happen when a dangerous fault is detected?

Emergency stops and monitors remove drive power or apply the brake when conditions are unsafe.

Grounded in trusted sources

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Every Wunder lesson is built from real, reputable sources — never invented.

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