Escalator warning system

Details Escalator warning system Escalator warning system

1985-09-09

1986-12-16

Valenza, Joseph E.

Conveyors: power-driven

Conveyor or accessory therefor specialized to convey people

With means to control the operation of the section

1985021, B65G 4300

Patent

active

046290524

ABSTRACT:
An optical beam (22) is projected across the path of escalator steps (4) and is repeatedly broken by the moving steps to generate a pulse train. When the beam passage is cleared by the steps but remains blocked by a passenger's foot being too close to the riser (6) of the adjacent step, thereby presenting a potential hazard as the steps undergo transition from inclined to horizontal runs, the interruption of the pulse train periodicity triggers a timed warning device, such as a buzzer (24), to alert the passenger. If the foot is not moved to clear the beam path after a short time, the warning intensity may be increased.

REFERENCES:
patent: 2846045 (1958-08-01), Fowler
patent: 3913723 (1975-10-01), Johnson

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