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Compasses with magnetic legs

A compasses and magnetic technology, applied in the direction of circular curve plotters, printing, writing utensils, etc., can solve the problems of cumbersome operation and easy damage, and achieve the effect of avoiding damage

Inactive Publication Date: 2012-04-11
陈道伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in teaching, teachers usually use a compass with a needle-pointed foot (stitch) at one end and a pencil foot (pen foot) at one end. In the operation of drawing a circle, either draw the known radius length on the side , and then use the two feet of the compass to draw a circle, or draw the radius length of the circle on the scale, and then draw it by hand. The operation is more cumbersome
At the same time, because the fixed gauge feet are fixed by iron with pointed substances, various magnetic black (white) plates are easily damaged after long-term use.

Method used

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Embodiment Construction

[0009] figure 1 , the magnetic gauge foot (1) is located at one end of the ruler (2) with scale and slide groove, and the slide block with holes (3) is at the other end of the ruler (2) with scale and slide groove. When in use, fix the magnetic gauge foot (1) at the position set by the magnetic black (white), determine the position of the slider with a hole (3), and turn the slider with a hole (3) around the magnetic gauge foot (1) Rotate 360 ​​degrees and the circle is drawn.

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Abstract

The invention discloses a pair of compasses with magnetic legs. The pair of compasses is characterized by consisting of magnetic compass legs, a ruler and a sliding block. According to the pair of compasses with the magnetic legs, the problems that a circle center is unfixed, the radius of the circle cannot be directly measured and the inconvenience for operation exists when a teacher draws the circle are solved.

Description

technical field [0001] The invention belongs to a compass with a magnetic foot in a teaching tool, the gauge foot of which is fixed with a magnetic material, and can directly display the radius of the circle made. Background technique [0002] At present, teachers usually use a compass with a needle-pointed foot (stitch) at one end and a pencil foot (pen foot) at one end in teaching. In the operation of drawing a circle, either draw the known radius length on the side , and then use the two feet of the compass to draw a circle, or draw the radius length of the circle on the scale, and then draw it by hand. The operation is more cumbersome. At the same time, because the fixed gauge feet are fixed by iron with pointed materials, various magnetic black (white) boards are easily damaged after long-term use. Using the compass with magnetic feet can not only specify the feet of the gauge, but also directly display the radius of the circle made. . Contents of the invention [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B43L9/02B43L9/16
Inventor 陈道伟潘富美陈伟
Owner 陈道伟