| 摘要 |
An overhead crane adapted to be supported on a pair of spaced apart, generally parallel first and second rails, the crane having a frame having opposite first and second ends, a first wheel rotatably mounted on the first end of the frame, the first wheel being adapted to roll along the first rail, a second wheel rotatably mounted on the second end of the frame, the second wheel being adapted to roll along the second rail, a first bearing assembly supporting the first wheel, a second bearing assembly supporting the second wheel, each of the first and second bearing assemblies including a bearing supporting the associated wheel for rotation relative to the frame about a rotation axis, the rotation axis having a position relative to the frame, and a mechanism connecting the bearing to the frame and allowing the bearing to be fixed in various positions relative to the frame, a hoist supported by the frame, and a load engaging mechanism which is raised and lowered by the hoist.
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