Abstract: This invention provides a circular tower spiral escalator structure with counter-rotating sprocket wheels at the top and bottom floors that use a side bow roller chain to connect and drive the ascending and descending escalator steps. Two pedestal robots and a step conveyor at the top and bottom floors pick up each escalator step when it arrives and move it to the opposite side of the circular tower where it departs. An alternate design replaces the two pedestal robots and step conveyor with a double arm pedestal robot on the top and bottom floors. Both designs provide continuous transport of escalator riders to a plurality of floors of varying ceiling heights with level entries and exits on each floor.

Abstract: This invention describes the design of a carrier system for people or goods that provides a continuous path of travel of a duo spiral escalator ascending and descending around a cylindrical tower with all stairway treads remaining upright and in continuous operation. At the bottom level and at the top level of the spiral escalator the treads follow a curved path from one side of the tower to the other as they travel along two half circle tracks. At the end of the first half circle in the center of the tower, each tread is lifted from its tracks, rotated 180 degrees, and placed back down on the tracks at the beginning of the second half circle. This invention permits continuous transportation of the riders ascending and descending to a plurality of floors of varying ceiling heights.

Abstract: This invention describes the design of a carrier system for people or goods permitting the continuous path of travel of a duo spiral escalator ascending and descending around a tower with a fixed diameter from the top to the bottom. At the bottom level and at the top level of the duo spiral escalator the invention consists of discontinuous upper and lower tracks for reversing the tread direction. Escalator chains connected to the tread support rods insure a smooth transfer of the treads between sets of tracks. This invention permits continuous transportation of the riders ascending and descending to a plurality of floors of varying ceiling heights. Current straight and spiral escalators have half of the treads carrying riders while the other half are empty as they travel back underneath. With this invention, as the treads move between floors, all of them may have riders aboard. This design saves horizontal space and requires fewer treads and materials than current escalators.