How an Escalator Step Changes Shape
An escalator step does not hinge or fold as it reaches an end. Instead, it stays level while its position is controlled by two sets of small wheels beneath it. One set follows the main track that carries the step around the escalator; another follows a shaped guide track. As the guide track curves toward the landing, it tips the step into a horizontal position. At the opposite end, the track reverses the movement so the step rises back into the staircase.
That motion lets the steps circulate continuously while the visible staircase appears to flatten into a floor. The track has to control not just the angle of each step but also its height and spacing, so neighboring steps meet without creating a sudden ledge.
The Comb Plate Is the Final Handoff
At each landing, a fixed metal plate with tooth-like projections—the comb plate—reaches toward the moving steps. Its teeth fit into the grooves across each step’s surface. As a level step passes beneath it, the teeth help keep the gap between the moving step and the stationary floor small and clear of debris that could interfere with the transition.
The teeth and grooves are not what flatten the steps; the guide tracks have already done that work. The comb plate is the carefully shaped boundary where the moving mechanism meets the fixed landing. Together, the tracks and plate let a rider step off onto a surface that is nearly level rather than having to negotiate one last rising or falling stair.
