Elevator construction is essentially a trussed beam to support the loop of stair-chain and treads with winding gear top and bottom. Recent changes have brought about transparent balustrades, while some

Figure 11.3c Escalator design: First stage entry to mall at Water Tower Place, Chicago, 1976, Architects: Loebl, Schlossman, Bennett and Partners

designs such as the installation at the Lloyd's Building, London, have the working mechanisms exposed to view within a glass-sided truss (Figure 11.4). Travelators are similar but lengths over 10 m will need supports at floor edges. There are limitations too on the rise of 6 m with inclines of 10° and 12° at speeds of 0.5 and 0.65 m per second respectively. Horizontal or near horizontal runs can be manufactured up to 120 m with inclines between 0° and 6° at speeds of 0.65-0.75 m per second. Footspace is needed for both types of equipment to house machinery around 2.5 m horizontally beyond the sloping part of the truss frame.

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