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Method and apparatus for viewing and measuring damage in an inaccessible area

  • US 4,078,864 A
  • Filed: 07/08/1976
  • Issued: 03/14/1978
  • Est. Priority Date: 07/08/1976
  • Status: Expired due to Term
First Claim
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1. An apparatus for viewing and measuring an object through a small opening within a housing which is generally inaccessible, including an optical viewing tube of fixed length, viewing means having an eyepiece at one end of said optical viewing tube, optical lens at the other objective end of said optical viewing tube for producing an image, a movable optical system located within said tube of fixed length between said viewing means and objective end for transmitting said image for viewing at said eyepiece, means for moving said optical system for focusing the image at said eyepiece, means for viewing divisional units through said viewing means, numeral indicating means connected to said optical viewing tube, said numeral indicating means being movable with said focusing means, said numeral indicating means indicating a number which is related to an actual length represented by a divisional unit of said eyepiece at the distance of the object from the objective end as viewed when the object is in focus, a retention tube positioned around said viewing tube of fixed length, said optical viewing tube of fixed length having a sliding and rotating movement within said retention tube, means for fixing said retention tube to a housing around a small opening, means for locking said optical viewing tube, in a fixed position within said retention tube, said viewing means having a micrometer controlled cursor to count the number of divisional units covered by the cursor as it moves between two predetermined points on said focused object wherein the product of said actual length represented by a divisional unit and said counted number of divisional units provides the actual length between the two predetermined points.

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