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Drawing rule for drawing cycle

A technology of drawing circles and sizes, applied in the field of teaching tools, can solve the problems of unintuitive and inconvenient operation of drawing circles with two-legged compasses, and achieve the effect of not being easy to move and intuitive teaching

Inactive Publication Date: 2009-03-25
武蒙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of this application is to solve the problem of inconvenient and unintuitive operation of drawing a circle with a two-legged compass, and to provide a drawing ruler for drawing a circle.

Method used

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  • Drawing rule for drawing cycle

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Effect test

Embodiment Construction

[0009] As shown in Figure 1, the application includes a fixed ruler 3 and a movable ruler 4, the movable ruler 4 is inserted in the dovetail groove of the fixed ruler 3 (the dovetail groove is not shown in the figure), and a pin is processed at the starting point of the scale of the fixed ruler 3 Hole 1 is processed with pen inserting holes 5 and 2 at the starting point and end point of the scale of movable ruler 4; The size scale numbers are arranged from right to left starting from the right pen insertion hole 5, that is, 18-32cm. It can be seen from the figure that the last scale number of the fixed ruler 3 is the same as the first scale number of the movable ruler, both are 18cm .

[0010] When in use, insert the needle into the pin hole 1 of the fixed ruler as the center of the circle, insert the chalk into the pen hole, and draw a picture on the blackboard. When the radius of the circle is less than or equal to the scale number of the fixed ruler 3, insert the pen into t...

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Abstract

The invention discloses a drawing ruler used for drawing roundness; the drawing ruler is characterized in that the drawing ruler comprises a fixed ruler which is fixedly marked by size calibration; the ruler body of the fixed ruler is provided with a dovetail groove which is inserted by a movable ruler with the swallow-tailed profile; a needle inserting hole is processed on the calibration starting point of the fixed ruler; a pen-inserting hole is processed respectively at two ends of the movable ruler; the size calibration of the fixed ruler is arranged from the left side to the right side by beginning with the needle-inserting hole; the size calibration of the movable ruler is arranged from the right side to the left side by beginning with the right pen-inserting hole; furthermore, the last calibration number of the fixed ruler is the same with the first calibration number of the movable ruler. The drawing ruler has the active effects that the drawing ruler is better than two-feet typed bow compass during the drawing process, and is not easy to move; furthermore, radium value can be read directly from the ruler, thus leading to objective teaching.

Description

technical field [0001] This application relates to teaching tools. Background technique [0002] At present, when teaching mathematics in elementary schools, teachers use traditional two-legged compasses to demonstrate circle drawing on the blackboard. This method has the following disadvantages: 1. The two feet are easy to move when using it, making circle drawing inaccurate; 2. Because it cannot be read directly The size of the radius makes it difficult for students to understand the radius intuitively. Contents of the invention [0003] The purpose of this application is to solve the problem of inconvenient and unintuitive operation of drawing a circle with a two-legged compasses, and provides a drawing ruler for drawing a circle. [0004] In order to achieve the above object, the structure of the present application is to include a fixed fixed ruler marked with a size scale, a dovetail groove is arranged on the chi body of the fixed ruler, and a movable ruler with a d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B43L9/04B43L7/10G01B3/04
Inventor 武蒙李志新
Owner 武蒙
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