Escalators
 Q: Why is it harder to walk up non-moving
escalator stairs than to walk up regular stairs?
[www.stairlock.com.au/] Stair treads and risers.
A: Engineers design escalators for moving people up--like cans on an inclined conveyor belt. The design
doesn't work for climbing because the steps rise too
high for the depth of the tread.
Many combinations of step riser and tread make a
comfortable climb but not the escalator's. The best
average riser-tread combination is probably 6-inches up
with a depth of 15-inches.
The typical escalator step rises about 8 inches with a
tread of 16 inches . That tread depth needs a much
shorter rise for climbing--about a 5 -to 5.5- inch riser.
Further Surfing:
Elevator/escalator history and information, Otis
Elevator Company
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