Patent ID: 7296661
Filing Date: 2007-11-20
Classification: B66B

Abstract:
1. Elevator levelling apparatus, comprising an elevator, first and second rigidly connected cross beams extending at angles across the elevator, eight pulleys on the beams, including four pulleys on each beam, the pulleys further comprising paired pulleys positioned on axles at opposite ends of each beam for freely rotating on the axles, four fixed ropes extending oppositely across the beams upward and downward from opposite ends of the beams, each beam having two oppositely extending ropes, each rope extending downward from a fixed position near a top of an elevator guide around a first pulley, across the beam, around a second pulley and downward to a fixed position near a bottom of the elevator, whereby raising and lowering an elevator with the crossed beams, pulleys and ropes constrains the ends of the beams and the elevator for equal movement along the ropes and maintains the beams and elevator in constant relation with respect to horizontal.