| 摘要 |
The storage and display elevator includes a series of movable shelves or platforms suspended from a pair of continuous chains, with the chains extending about upper and lower pairs of sprocket wheels. At least one upper guide sprocket is rotatably supported beneath one of the upper sprocket wheels, and a similar lower guide sprocket is rotatably supported beneath one of the lower sprocket wheels, and a lower portion of each storage and display platform engages the teeth of the guide sprockets as the platforms move about the peripheries of the sprocket wheels, from the front to the rear, or from the rear to the front of the flights of the chains. Vertical cam tracks extend parallel to the flights of the chains, and cam followers engage the vertical cam tracks during vertical movement and engage the teeth of the guide sprockets during arcuate movement from a front to a rear flight or from a rear to a front flight.
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