Moving handrail drive
An escalator handrail drive system includes a powered drive belt which engages the underneath surface of the handrail along the return path of travel of the latter. A series of pressure rollers engage the outer surface of the handrail to press the latter against the drive belt. The pressure rollers are all biased against the handrail by a single spring. The drive belt is pretensioned by an adjustable pretension spring assembly which can apply a fixed pretensioning force to the drive belt which will not substantially change irrespective of whether the handrail is being driven in the "up" direction or in the "down" direction on the escalator.
Otis Elevator Company
B
B66B
inventional
Helmut J. W. Hermann W. Klous
Meyer Ahls Blaseck