| 摘要 |
A raising and lowering device is provided which may be mounted on a reference structure having a mounting surface. The raising and lowering device includes a pair of guide columns, each guide column having a load bearing mount fixedly secured thereto. A load bearing surface on each load bearing mount abuts the mounting surface on the reference structure. Each guide column also defines a cavity and a slot allowing access to the cavity. A support structure which bears the objects to be raised or lowered extends through the slots and into the cavity of each guide column. Roller assemblies, coupled to the support structure, are positioned within the cavity of each guide column to direct movement of the support structure along the guide columns. Cables connect to the support structure at one end and to a cable joint at the other end. The cable joint is movable using a single actuator, the support structure being evenly raised and lowered thereby.
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