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Optical fiber preform manufacturing apparatus which measures a vertical load with three cells

  • US 5,624,474 A
  • Filed: 11/09/1994
  • Issued: 04/29/1997
  • Est. Priority Date: 11/12/1993
  • Status: Expired due to Term
First Claim
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1. An optical fiber preform manufacturing apparatus for manufacturing an optical fiber preform by depositing fine glass particles on a first rod, said first rod being connected to a first end of a second rod and rotated with the second rod, said optical fiber preform manufacturing apparatus comprising:

  • an elevating unit having an elevating member and means for vertically moving the elevating member, the elevating member having a first surface;

    a rotary support unit for gripping a second end of the second rod to suspend and support the second rod vertically and for rotating the second rod about a longitudinal axis of the second rod, the rotary support unit having a second surface which is vertically spaced from the first surface; and

    at least three load cells disposed between the first surface and the second surface for supporting said rotary support unit and for determining a load vertically applied to the rotary support unit.

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