Marblevator, Self Reversing Screw Lift.

I've created many "Marblevators" using various lift techniques to lift a marble from the end of the track back to the start of the track. In "Marblevator, Self Reversing Screw Lift", I've designed a "reversing screw mechanism" incorporating twin travelers. As the reversing screw rotates, the travelers raise and lower two slides and buckets. The buckets pick up a marble from the end the tracks, lift the marble to the start of the tracks, where the buckets dump the marble onto the start of the tr…

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