| 摘要 |
The present invention relates to a guiding assembly for maintaining a rotary drive assembly in a predetermined orientation whilst raising or lowering the drive assembly, said guiding assembly including an inner body, an outer body located about at least a portion of the inner body and being in substantially co-axial alignment with the inner body, said outer body being movable relative to said inner body in an axial direction, and a first set of at least three link arms extending between the inner body and the outer body, said link arms being adapted to maintain the inner body and the outer body in substantially co-axial alignment during relative movement of the bodies.
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