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Round radial ruler

A technology of circle diameter and ruler body, which is applied in the field of tools for quickly measuring the radius of outer circle contours, and can solve the problems of large measuring tools, inability to measure, and low efficiency

Inactive Publication Date: 2009-03-18
王启明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of these technologies are: in some cases, the measurement space is too small, and the measurement tool itself is too large to complete the measurement of the radius or diameter of the measured circle; or there are high requirements for the shape of the measured circle, such as requiring the outer circle The circumference angle of the contour should be at least 180 degrees, so that it can be directly measured with a caliper; there are other measurement methods, such as measuring the length of several chords on the outer circle, and then calculating the radius value through cumbersome trigonometric functions. Such errors are also large and the efficiency is low

Method used

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Embodiment Construction

[0011] Such as figure 1 As shown, a circle whose center is "O", the straight lines AC and BC are the outer tangents of the circle 0 respectively, and the two lines intersect at point C. According to the outer tangent theorem of a circle, the angles ∠OBC and ∠OAC are right angles, then respectively constitute Two right triangles OBC and OAC.

[0012] Take the angle OCA of a right triangle as the angle "a", and the radius OA is defined as the radius "r", then according to the right triangle theorem: the right angle side of a right triangle is equal to the hypotenuse multiplied by the sine of the corresponding angle;

[0013] That is, OA=OC×sin∠OCA, and OA=r=OC×sin a.

[0014] Take the angle ∠OCA as 30°, because sin30°=1 / 2=0.5;

[0015] There are OA=OC×0.5, and OA=r=OC×0.5.

[0016] Redefining the intersection point of OC and circle O as "D", because OA=OB=OD;

[0017] Get OD=OA=OC×0.5, and because OC=OD+DC;

[0018] Thus OD=DC, and because OA=OB=OD

[0019] Therefore, as l...

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Abstract

The invention discloses a tool capable of quickly measuring circular arc radius, in particular a diameter gauge, which is characterized by comprising a gauge body and two gauge feet, wherein the outlines of the gauge body and the gauge feet are of straight line segments, and the two gauge feet are symmetrical relative to a gauge body axis so as to form three edges of an isosceles trapezoid which takes the gauge body as an upper bottom and the two gauge feet as waists; and the inclined angle of the extended lines of the two gauge feet is 60 degrees, and the middle section of the gauge body is provided with a telescopic sliding scale the central line of which is coincided with the perpendicular bisector of the gauge body. Any rounded object, the angle of circumstance of which is not less than 120 degrees, can use the tool with the structure to solve the problem in practical work that the radius is difficult to measure, and the tool has the advantages of simple structure, low cost and convenient use.

Description

technical field [0001] The invention relates to a measuring tool, in particular to a tool capable of rapidly measuring the radius of an outer circle. Background technique [0002] In modern society, all walks of life often encounter the problem of measuring the diameter or radius of a circle. For example, the construction industry needs more accurate measurement of cylinders; most of the circular or cylindrical mechanical parts in the machinery industry need to measure their circle radius or diameter with a certain accuracy for production or maintenance. In the field of transportation, it is necessary to measure the radius or diameter of the wheel during production or use, so as to track the degree of use of the wheel, as a basis for judging maintenance, scrapping or continued use. The currently used methods of measuring the diameter or radius of a circle or a cylinder all adopt direct measurement or an arc calculation method or the like. The disadvantages of these technol...

Claims

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Application Information

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IPC IPC(8): G01B5/08
Inventor 王启明
Owner 王启明
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