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Encased position measuring instrument

  • US 4,777,361 A
  • Filed: 07/16/1987
  • Issued: 10/11/1988
  • Est. Priority Date: 08/06/1986
  • Status: Expired due to Fees
First Claim
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1. An improved encased measuring device for measuring the relative position of two objects movable relatively to one another, the measuring device of the type comprising a housing attached to one of the two objects;

  • a measuring scale mounted to the housing;

    a scanning unit operative to scan the measuring scale to produce at least one measuring signal;

    a connecting element adapted to connect the scanning unit to the other of the two objects and passing through an opening in the housing, the connecting element such that relative movement of the two objects produces relative movement between the scanning unit and the measuring scale, the movement of the connecting element defining a measuring direction, the improvement comprising;

    means for sealing the opening between the connecting element and the housing; and

    means for positioning the means for sealing with respect to the housing such that the means for sealing is substantially rigid with respect to the housing in the direction of movement of the connecting rod and substantially movable in directions nonparallel to the direction of movement of the connecting element.

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