Escalator

摘要

An escalator comprising four kinds of steps is disclosed. The first steps are ordinary steps, and the second step is disposed between the first steps and has a retractable support device for supporting a vertically movable step of the third step. The movable step supported by the support device lifts from the third step as the steps ascend to provide a deeper effective tread together with the tread of the second step. The fourth step includes a drop-down step which can be moved into a sloped position which also provides a space for safely accommodating a wheelchair or the like on the deep effective tread thus provided by the second, third, and fourth steps.