Patent ID: 8336675

Claim:
An elevator, comprising: an elevator car; at least one belt sheave having a sheave running surface; and at least one flat belt for suspending and moving the elevator car, the flat belt wrapping a part of the circumference of the belt-sheave, the flat belt having, in an area of a first belt running surface, at least one guide groove, the belt-sheave being provided with at least one guide rib which projects from the sheave running surface and extends in a circumferential direction of the sheave running surface, the guide rib being narrower than the guide groove; wherein when the first belt running surface of the flat belt lies on the sheave running surface and the guide rib engages in the guide groove, the guide rib being narrower than the guide groove producing a gap between a flank of the guide rib and a flank of the guide groove opposing the flank of the guide rib, the gap between the flanks being substantially equal along the length of the flanks, the gap permitting axial play S a between the guide rib and the guide groove in the direction of the axis of the guide sheave, the amount of axial play S a between the guide rib and the guide groove is 0.1 mm to 3 mm, and the axial play S a preventing both opposing flanks of the guide rib and the guide groove from being in contact simultaneously.