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Tensioned support shaft and other molten metal devices

  • US 10,267,314 B2
  • Filed: 01/13/2017
  • Issued: 04/23/2019
  • Est. Priority Date: 01/13/2016
  • Status: Active Grant
First Claim
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1. A rotor shaft for use in a molten metal device, the rotor shaft comprising:

  • an outer tube having a first end, a second end, and an outer surface;

    an inner rod having a first end and a second end;

    a cap that threads onto the first end of the inner rod, and that has an upper portion configured to be connected to a coupling that drives the rotor shaft; and

    a structure that retains the second end of the outer tube;

    wherein when the cap is connected to the coupling and the coupling drives the rotor shaft, the rotor shaft moves in a direction that tightens the cap against the first end of the outer tube to apply axial pressure on the outer tube.

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