Escalator comb safety device

Details Escalator comb safety device Escalator comb safety device

1988-01-21

1989-01-31

Spar, Robert J.

Conveyors: power-driven

Conveyor or accessory therefor specialized to convey people

With means to control the operation of the section

198325, B66B 2906

Patent

active

048009989

ABSTRACT:
A safety device for use in the comb part of an escalator landing is operable to detect objects which pass into the comb from the escalator treads. The device includes a photodetector which is positioned beneath the comb and which detects a light beam projected across the comb where the treads pass through the comb. When a foreign object passes under the comb and blocks the light beam, this potential hazard is sensed by the detector. If the light beam remains blocked for a predetermined time period, the detector energizes and amplifier which in turn causes a relay to stop operation of the escalator motor.

REFERENCES:
patent: 3233717 (1966-02-01), Jin et al.
patent: 3913723 (1975-10-01), Johnson
patent: 3934699 (1976-01-01), Saito et al.
patent: 4088219 (1978-05-01), Binns
patent: 4629052 (1986-12-01), Kitamura

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