Patent ID: 7757817

Claim:
An elevator installation, comprising: an elevator cage; a drive pulley; at least one support means formed as a flat belt; and a drive engine which drives the at least one support means, which carries the elevator cage, by way of the drive pulley, wherein the support means has, at least on a running surface facing the drive pulley, several ribs of wedge-shaped or trapezium-shaped cross-section which extend parallel in a longitudinal direction of the support means and further has several tensile carriers oriented in the longitudinal direction of the support means, the tensile carriers being sized so that a total cross-sectional area of all the tensile carriers amounts to at least 25% of a cross-sectional area of the support means, wherein spacings (A) between centers of two tensile carriers associated with a rib are smaller than spacings (B) between the centers of adjacent tensile carriers associated with two adjoining ribs, wherein the spacings (A) between centers of two tensile carriers associated with a rib are not more than 20% smaller than the spacings (B) between the centers of adjacent tensile carriers associated with two adjoining ribs.