Conveyors: power-driven – Conveyor or accessory therefor specialized to convey people – By stairway having steps forming an endless member
Patent
1986-07-28
1988-02-23
Leppink, James A.
Conveyors: power-driven
Conveyor or accessory therefor specialized to convey people
By stairway having steps forming an endless member
B66B 912
Patent
active
047264632
ABSTRACT:
In transport installations, particularly escalators, a latent danger of jamming exists between a moving step and the stationary skirt panels mounted laterally near the steps, above all for flimsy footwear. In the escalator step according to the invention, throughout a danger zone coinciding with the precursive level run of an escalator step run, a tread edge member laterally adjacent each step is positively shifted upwards by a certain amount. In a return run of the escalator step run, this tread edge member is held by a spring force in a position lying flush with a tread surface of the step. The relative motion occurring between each step and a traction member for forming a constantly horizontally running tread surface of the step in the precursive level run of the escalator step run, results also in an angular displacement between an escalator step body of the escalator step and a cam or crank arm connected with a pivot axis of the traction member. This angular displacement is exploited for actuating the lateral tread edge members in that an entrainment pin or crank pin mounted on the cam or crank arm actuates a rocker arm pivoted on the step body. In turn the rocker arm appropriately moves the tread edge member upwards and downwards.
REFERENCES:
patent: 2981397 (1961-04-01), Hansen
patent: 3986595 (1976-10-01), Asano et al.
patent: 4470497 (1984-09-01), Kraft
patent: 4570781 (1986-02-01), Kappenhagan
patent: 4638901 (1987-01-01), Lunardi
Inventio AG
Kleeman Werner W.
Leppink James A.
Smith Matthew
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