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Circle describing instrument for blackboard

A circular instrument and blackboard technology, applied in the field of teaching aids, can solve problems such as affecting the effect of a circle, affecting the effect of drawing a circle, and easy loosening of screws.

Inactive Publication Date: 2015-02-04
孙睿豪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional compasses used by teachers in the teaching process often have many inconveniences. The foot of the compass used as the center of the circle is often hard and sharp, and the blackboard is relatively smooth. When the teacher draws a circle, the foot is very easy. Slipping will affect the effect of drawing a circle, and the tip of the compass will also damage the blackboard
In addition, the compass has been used for a long time, and the screws fixing the two compass legs are easy to loosen, and it is easy to misalign when drawing a circle, which will also affect the effect of the circle, and the radius of the circle is not easy to be accurate when drawing a circle
However, there are no related products to solve this problem

Method used

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  • Circle describing instrument for blackboard

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Experimental program
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Effect test

Embodiment Construction

[0008] like figure 1 As shown, the blackboard circle drawing instrument of the present invention is characterized in that it includes an adsorption device and a tape measure 5, the adsorption device includes a support frame 2, the bottom end of the support frame 2 is provided with a suction cup 3, and the upper part of the support frame 2 is connected to the lifting bolt 1 The lifting bolt 1 is provided with a collar 4, the other end of the collar 4 is connected with the measuring tape 5, and the end of the measuring tape 5 is provided with a rope 6.

[0009] The purpose of the adsorption device is to establish a stable center of circle for subsequent circle drawing process. The lifting bolt 1 of the adsorption device is raised and lowered on the support frame 2 to achieve the purpose of tightening the suction cup 3 .

[0010] When this structure is in use, first place the adsorption device on the plane of the blackboard so that the suction cup 3 sticks to the plane of the bl...

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Abstract

The invention discloses a circle describing instrument for a blackboard. The circle describing instrument for the blackboard comprises an adsorption plant and a tape; the adsorption plant comprises a support frame; the bottom end of the support frame is provided with a sucker; the upper part of the support frame is in threaded connection with a lifting bolt; the lifting bolt is provided with a lantern ring; the other end of the lantern ring is connected with the tape. According to the structure of the circle describing instrument, the required radius can be conveniently selected, and circles can be conveniently described; the structure is simple in operation and lower in cost.

Description

technical field [0001] The invention relates to a teaching auxiliary instrument, in particular to a blackboard circle drawing instrument. Background technique [0002] The traditional compasses used by teachers in the teaching process often have many inconveniences. The foot of the compass used as the center of the circle is often hard and sharp, and the blackboard is relatively smooth. When the teacher draws a circle, the foot is very easy. Slipping will affect the effect of drawing circles, and the tip of the compasses will also damage the blackboard. In addition, the compasses have been used for a long time, and the screws fixing the two compass legs are easy to loosen, and it is easy to misalign when drawing a circle, which will also affect the effect of the circle, and the radius of the circle is not easy to be accurate when drawing a circle. And do not see relevant product to solve this difficult problem yet at present. Contents of the invention [0003] The purpos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B43L9/00
CPCB43L9/00
Inventor 孙睿豪
Owner 孙睿豪
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