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LINEAR EXTENSIBLE MEASURING INSTRUMENT WITH TELESCOPIC MEMBERS

  • US 3,680,214 A
  • Filed: 03/06/1970
  • Issued: 08/01/1972
  • Est. Priority Date: 07/24/1967
  • Status: Expired due to Term
First Claim
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1. A linear measuring instrument comprising:

  • an elongated casing having an end portion defining one measuring point;

    at least one telescoping member having an end tip defining another measuring point;

    means telescopingly mounting said telescoping member for partial extension from said casing to linearly bridge a linear distance to be measured by said measuring points and for retraction into said casing;

    a transparent window in said casing positioned at an angle with respect to the direction of telescoping movement of said telescoping member;

    a roll of measuring tape mounted for unwinding and winding movement within said casing and having one end connected to an end of said telescoping member whereby extension of said telescoping member effects unwinding of said roll of measuring tape;

    tape guiding means including a pair of rotatable rollers disposed interiorly of said casing on opposite sides of said transparent window for guiding said measuring tape past said transparent window during extension of said telescoping member;

    means for automatically rewinding said measuring tape during retraction of said telescoping member;

    linear measuring indicia on said measuring tape providing a direct indication beneath said transparent window of the linear distance existing between said measuring points; and

    locking means for releasably locking said telescoping member in any desired extended position.

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