Otis Elevator Company

Knut Wallbaum

Frank M Sansevero

Peter Borchers

An escalator which follows a curvilinear path with a fixed center constant radius in plan must have steps with specially configured risers. The step risers will have vertical cleats which mesh with trailing edges of adjacent steps, which meshing must be performed without risk of jamming. The escalator has an outer step chain which changes its effectual length over the path of travel of the escalator, whereby it is shorter in the inclined zone and longer in the landing zones of the escalator. The radii of the step risers, in elevation must thus decrease along the step riser cleats as the cleats descend away from the step tread.

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Wunstorf, Germany

Knut Wallbaum