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Elevator with traction sheave

  • US 8,556,041 B2
  • Filed: 04/13/2010
  • Issued: 10/15/2013
  • Est. Priority Date: 01/09/2002
  • Status: Expired due to Fees
First Claim
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1. An elevator, comprising:

  • a set of hoisting ropes supporting a counterweight and an elevator car moving on respective tracks, each hoisting rope having a substantially round cross-section; and

    a hoisting machine engaging the set of hoisting ropes via a traction sheave;

    wherein the traction sheave has a plurality of rope grooves,wherein each of the plurality of rope grooves generally conforms to a substantially circular shape,wherein each of the plurality of rope grooves has an opening for receiving a hoisting rope from among the set of hoisting ropes,wherein a width of the opening is less than a diameter of a respective rope groove,wherein a coating is adhesively bonded to each of the plurality of rope grooves,wherein in each rope groove, the coating has a crescent-shaped cross-section,wherein each hoisting rope has a diameter below 8 mm,wherein each hoisting rope is composed of steel wires having a strength exceeding 2000 N/mm2, andwherein a contact angle between the set of hoisting ropes and the traction sheave is greater than about 180 degrees.

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