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Magnetic scaling device

  • US 4,484,391 A
  • Filed: 10/15/1982
  • Issued: 11/27/1984
  • Est. Priority Date: 10/15/1981
  • Status: Expired due to Fees
First Claim
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1. In a magnetic scaling device of the type comprising a casing having an interior and an exterior;

  • a magnetic scale disposed on said casing;

    a reading head disposed in the interior of said casing for scanning said magnetic scale and providing an output signal corresponding to relative linear displacement of said head and said scale; and

    means for effecting relative displacement of said magnetic scale and said reading head;

    the improvement of said casing being closed and having at least a portion thereof of a non-magnetic material, and said magnetic scale being affixed on the exterior of said non-magnetic portion of the casing such that said reading head scans said magnetic scale through said non-magnetic portion.

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