Outer diameter measuring ruler

A technology of measuring ruler and vernier ruler, which is applied in the direction of mechanical diameter measurement, etc., can solve the problems of inconvenient reading data and insufficient measurement accuracy
CN102401623AInactive Publication Date: 2012-04-04汪砚秋
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
汪砚秋
Publication Date
2012-04-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a simple and convenient outer diameter measuring ruler which is shaped like an isosceles U shape with a downward opening, wherein the isosceles U shape is narrow in the upper and is wide in the lower, a vernier capable of moving up and down is arranged on a ruler body, and an alignment line is arranged on the vernier. The outer diameter measuring ruler makes use of the characteristic that the waist width changes along with the isosceles trapezoid which changes along the waist height, in measurement, the measuring ruler is inserted into a circular object to be measured, the lower edge of the vernier and the inner side of the ruler body are led to be in contact with the outer edge of the circular object to be measured, and the measurement data can be read according to the scale corresponding to the alignment line on the veriner. Any requirements on measurement precision can be met by the angle change of the isosceles trapezoid, but the measurement interval of the measuring ruler is shortened, and the requirement on large measurement interval can be met by a group of measuring rulers.
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Description

[technical field]

[0001] The invention relates to a scale measuring tool, especially a portable outer diameter measuring tool. [Background technique]

[0002] Existing external diameter measuring tools include calipers, vernier calipers, micrometers and other measuring tools. These measuring tools have problems such as insufficient measurement accuracy or inconvenient reading data that need to be improved. [Content of the invention]

[0003] The purpose of the present invention is to provide an outer diameter measuring tool which is easy to manufacture, high in precision and convenient for reading data.

[0004] In order to achieve the above object, the outer diameter measuring ruler of the present invention is composed of an inverted U-shaped plane ruler body 1 and a vernier ruler 2 that can slide up and down. The inner side of the U-shaped ruler body is a symmetrical isosceles hypotenuse. The slope of the hypotenuse depends on the measurement accuracy. The smaller the s...

Claims

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