Look a little closer
See the mechanism
A guided step loop
Read the diagram
The drive advances connected steps around a loop. Treads remain horizontal on the rising passenger run. Guide paths bring neighboring treads to the same height at the upper landing; the steps then turn into the hidden return route. A separate handrail loop follows the ride. The inset distinguishes two roller guide paths beneath a level tread.
Conventional chain-driven escalator concept. The inset explains guide functions rather than supplying an actual track profile. Step count, clearances, slopes, drive dimensions and handrail return position are illustrative.
Conventional chain-driven escalator concept. The inset explains guide functions rather than supplying an actual track profile. Step count, clearances, slopes, drive dimensions and handrail return position are illustrative.
Diagram basis: KONE component guide; Otis steps and chain components; KONE track-and-chain background.
Sources: KONE · Otis Elevator Company · KONE Corporation; US patent application via Google Patents · U.S. Consumer Product Safety Commission
The step that disappears is coming back
A step reaches the upper landing, passes beneath the stationary landing area and travels around a hidden return route. It later rejoins the visible passenger run. The stairway is therefore a circulating band of steps rather than a stack of individual platforms that is continually being manufactured at one end.
KONE's planning guide identifies the drive station, return station, step chain, tracks and supporting truss as separate components. Those names help distinguish what moves from what supports it. The truss spans between building levels and houses the machinery. The step band moves within that structure. Our side view removes the cover conceptually to show the return path; it is not an instruction for accessing it.
Sources: KONE
The motor does not grip the grooves under your shoes
Conventional step chains connect the moving sequence below the passenger surface. Chain wheels and a powered drive advance the band. Otis's M.L. parts publication lists step chains, axles and chain wheels separately from comb and floor plates. The grooves you see on the tread belong to the passenger-facing geometry, not the main drive engagement.
That distinction matters because several repeating patterns are visible on one machine. A chain has links that transmit pulling force. A step has a tread that supports a passenger. A landing comb has teeth that interact with the tread grooves at the transition. Their repeating shapes have different purposes: transmission below, support above and a managed transition at the landing.
Sources: Otis Elevator Company · KONE Corporation; US patent application via Google Patents
A rigid step can follow a slope with a level tread
Steps run on rollers whose guide paths constrain their positions. A conventional step has supports associated with different parts of its body; the track geometry controls how those supports move relative to one another. On the inclined passenger run, this keeps the tread suitable for standing while neighboring steps occupy different heights.
The chain provides motion, but the guides determine the permitted route and orientation. This is the crucial division of labor. Pulling a freely hinged band up an incline would not, by itself, guarantee level treads. The KONE patent background describes rollers supported on guide tracks and steps coupled to endless chains. It also discusses monitoring specific mechanical connections; it does not prove every escalator includes its proposed detector.
Sources: KONE Corporation; US patent application via Google Patents · Otis Elevator Company
At the landing, the steps change their relationship
Near a landing, the guide geometry brings consecutive treads into a common horizontal plane. KONE's planning guide explicitly treats horizontal landing portions as part of escalator configuration. The individual steps do not have to turn into flexible flat plates for the staircase profile to disappear. Their relative heights change as they approach the end.
Compare a pair of adjacent treads as they approach the landing. On the incline, one sits higher than the other. At the landing, they reach the same level. The surfaces are still separate moving parts. Saying the staircase becomes flat is correct at the level of the band, but saying each rigid step folds flat would describe a different design.
Sources: KONE · Otis Elevator Company
The comb manages a transition; it does not erase the gap
At the landing, a stationary comb plate has teeth arranged to meet the grooves in the moving tread. This manages the transition from the moving step surface to the fixed floor area. The comb and the tread remain separate components, with one fixed and the other moving beneath it.
Even a carefully designed moving-to-fixed interface can present an entrapment hazard. CPSC's consumer guidance addresses clothing and footwear caught around step edges or landing interfaces and advises prompt stepping off. The relevant mechanical point is that intermeshing shapes do not make two surfaces one continuous piece. Loose material can interact with a gap differently from the rigid parts the gap was designed around.
Sources: Otis Elevator Company · U.S. Consumer Product Safety Commission
A second loop accompanies the first
The handrail is a driven loop with its own return path. Its visible upper portion accompanies passengers; the hidden portion comes back inside the balustrade arrangement. The handrail drive is listed separately from the step band in KONE's component guide. A handrail is not pulled forward by passengers' hands or simply attached to each step.
The system coordinates these motions so that a rider has support during the journey. That coordination does not turn an escalator into a suitable route for every wheeled object or every passenger need. CPSC advises using an elevator for strollers and holding the handrail when riding. The underlying machine explanation is helpful precisely because it reveals multiple moving interfaces, rather than disguising the escalator as an ordinary stationary staircase.
Sources: KONE · U.S. Consumer Product Safety Commission
Questions you might still have
Where do the steps go after the top landing?
They turn into a hidden return path inside the supporting structure and circulate back to the other end. The passenger sees one part of an endless step band rather than a staircase that ends at the landing.
Sources: KONE
Do the individual steps fold flat?
In the conventional design shown here, rigid steps change their relative heights as the guide paths bring neighboring treads into a common plane. That flattens the band at the landing without requiring each step to fold.
Sources: KONE · Otis Elevator Company
Why are the treads grooved?
The grooves allow the landing comb teeth to meet the moving step surface in a controlled geometry. They are not the main drive's gear teeth, and the interface still requires users to keep loose clothing and footwear clear.
Sources: Otis Elevator Company · U.S. Consumer Product Safety Commission
The thing to remember
The drive supplies movement; the tracks supply geometry. The visible staircase is only half of the step loop.
What this example leaves out
This shows a conventional chain-driven escalator, not every compact, spiral or specialized design. Drive arrangements, tracks, landing lengths, monitoring and codes vary. Historical parts and patents explain architecture, not present-day installation compliance. The diagram cannot specify safe clearances or maintenance procedures.
Sources & further reading
Source access dates are listed below. Manufacturer descriptions and patents support the specific constructions described, not every product.
- Planning Guide for KONE Escalators & Autowalks ↗
KONE · Retrieved 2026-10-14 · Truss, drive station, step chain, tracks, return station, handrail drive and horizontal landing portions.
Published planning guide referencing older codes; not current regulatory advice, traffic calculations or an exact installation drawing. - C-932A — M.L. Escalator: Steps, Axles, Comb & Floor Plates, Step Chains & Wheels ↗
Otis Elevator Company · Retrieved 2026-10-14 · Distinct step rollers, axle/chain wheels, step-chain links and comb/floor plates in a conventional assembly.
Historical parts publication for M.L. escalators; parts taxonomy supports the explanation, not present-day interchangeability or maintenance. - US20150107958A1 — Safety device for a passenger transport installation ↗
KONE Corporation; US patent application via Google Patents · Retrieved 2026-10-14 · Background describes steps on rollers guided by tracks and coupled to endless chains; application proposes connection monitoring.
Published engineering architecture. A patent does not prove every installed escalator has the proposed detector. - Know the Steps to Safety When Using Escalators ↗
U.S. Consumer Product Safety Commission · Retrieved 2026-10-14 · Entrapment remains possible around step edges and landing gaps; users should hold the handrail and step off promptly.
2008 consumer guidance used for persistent interface hazards; historical injury estimates and shoe rankings omitted.
