Patent ID: 8069955
Filing Date: 2011-12-06
Classification: B66B,Y10T

Abstract:
1. An elevator, comprising: an elevator car; a counterweight; a set of hoisting ropes of substantially round cross-section; and a plurality of rope pulleys; wherein the elevator car and the counterweight are suspended on the set of hoisting ropes, wherein a first end of the set of hoisting ropes is attached to a first anchorage that does not move as the elevator car moves, wherein a second end of the set of hoisting ropes is attached to a second anchorage that does not move as the elevator car moves, wherein at least one of the rope pulleys comprises a solid surface including a plurality of rope grooves configured to receive at least one hoisting rope of the set of hoisting ropes, wherein each rope groove generally conforms to a substantially circular shape and has an opening for receiving a hoisting rope, the opening having a width less than a diameter of the rope groove, wherein each rope groove includes a groove bottom and groove sides, wherein the at least one of the rope pulleys includes a coating adhesively bonded to the at least one of the rope pulleys, wherein the coating is configured to directly contact the at least one hoisting rope, wherein, at the groove bottom of each rope groove, a thickness of the coating measured in a direction perpendicular to a rotation axis of the at least one of the rope pulleys from a hoisting-rope-contacting surface of the coating to the solid surface is less than 3 mm or is equal to about 3 mm, wherein, at the groove sides of each rope groove, the thickness of the coating is less than 3 mm or is equal to about 3 mm, wherein, at the groove bottom of each rope groove, the thickness of the coating measured in the direction perpendicular to the rotation axis of the at least one of the rope pulleys from the hoisting-rope-contacting surface of the coating to the solid surface is substantially less than half the thickness of the at least one hoisting rope, wherein the coating has a crescent-shaped cross-section covering the groove bottom and the groove sides of each rope groove, and wherein a thickness of the coating covering the groove sides is less than the thickness of the coating covering the groove bottom.