Curved escalator step chain turnaround zone

Details Curved escalator step chain turnaround zone Curved escalator step chain turnaround zone

1990-08-31

1991-06-04

Dayoan, D. Glenn

Conveyors: power-driven

Conveyor or accessory therefor specialized to convey people

By stairway having steps forming an endless member

198329, B66B 2102

Patent

active

050206540

ABSTRACT:
The curved escalator has inner and outer step chains that are entrained on inner and outer sprockets which have different diameters, the outer sprocket having a larger diameter than the inner sprocket. The steps of the escalator reverse their direction of movement at the sprockets and pass from the passenger bearing run to a return run beneath the passenger bearing run. One of the sprocket sets is the power or driving set and the other is an idler set, which will be spring biased to maintain chain tension. In order to reverse the steps, they must tip or dip sideways because of the different sized sprockets. The dip zone of the roller tracks has an S curve to minimize noise and allow location of the track splice on the tensioned end of the escalator to be placed over the axis of rotation of the tensioned sprockets.

REFERENCES:
patent: 3419127 (1968-12-01), Yost
patent: 4730717 (1988-03-01), Sugita
patent: 4739870 (1988-04-01), Saito
patent: 4746000 (1988-05-01), Nakatani et al.
patent: 4809840 (1989-03-01), Nakatani

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