Frame structure for a curved escalator

A frame structure for a curved escalator comprising an outer side and inner side truss unit assembly, each of said assemblies including a plurality of truss units connected to each other to define an arc in plan, said frame structure having upper and lower horizontal sections and an intermediate sloped section between the upper and lower sections, said frame structure further comprising:

• an upper transition section connected between said upper horizontal section and said sloped section, and a lower transition section connected between said lower horizontal section and said sloped section, each transition section having a slope less than that of the sloped section,
• each said truss unit including upper and lower cordal truss members and horizontally spaced first and second vertical truss members connecting said upper and lower cordal truss members;
• means connecting said plurality of truss units of each of said assemblies to form said inners and outer side truss unit assemblies having adjacent cord portions connected at angled junctures and vertical truss members disposed substantially at said junctures;
• and
• horizontal cross members, each lying along a local radius of curvature of said frame structure and extending transversely of and connecting between a vertical truss member of said inner side truss unit assembly and a corresponding vertical member of said outer side truss unit assembly such that said inner and outer vertical members and the horizontal member connecting said inner and outer vertical members all lie in a vertical plane containing a local radius of curvature of said frame structure.