| 摘要 |
A trolley wheel for a load lifting apparatus that is movable along a rail having a horizontal supporting surface. The wheel includes a crowned tread surface for rolling contact with the rail and a flange for stabilizing the tread surface in position on the rail. The flange includes a substantially crowned realigning portion for realignment of the wheels on the rail with minimal contact or binding. The flange also includes an undercut portion for added clearance between the flange and the rail. Preferably, the crowned tread surface and crowned realigning portions are heat treated for improved wear resistance. The undercut may also be heat treated for added toughness.
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