FRAONKOPPLINGSANORDNING FOER EN RULLTRAPPA

A pair of light barriers are mounted on a pair of spaced apart balustrade sockets located on opposite sides of an endless step conveyor-type escalator. The light barriers are positioned at the transition of upper and lower transisition arches to an inclined run of the conveyor. The light barriers each include a transmitter and receiver for emitting and receiving a light beam transversely to the direction of travel of the conveyor. The light beam is interrupted by side shields on the conveyor steps. An opening is formed adjacent a leading edge of each side shield and one or more openings are formed adjacent a trailing edge of each side shield. The trailing edge openings are formed as oblong holes each with a longitudinal axis extending with respect to the tread of the step at the same angle as the inclination of the inclined run of the escalator with respect to the horizontal. The oblong holes are formed at different angles corresponding to typical angles and inclination such that the side shields can be used with different standard escalator installations.