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Telescopic ball bar gauge

  • US 7,997,001 B1
  • Filed: 06/14/2010
  • Issued: 08/16/2011
  • Est. Priority Date: 06/14/2010
  • Status: Expired due to Fees
First Claim
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1. A telescopic ball bar gauge, comprising:

  • a telescopic rod having first and second telescopic segments;

    first, second and third annular solenoid coils mounted within the first telescopic segment, the first, second and third annular solenoid coils being mounted about a central tube, the second telescopic segment being slidable within the central tube to form a linear variable differential transformer; and

    first and second balls, the first ball being mounted to a free end of the first telescopic segment, the second ball being mounted to a free end of the second telescopic segment;

    wherein the linear variable differential transformer generates a measurement signal corresponding to a linear distance between the first and second balls.

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