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Compasses for teaching

A technology of compasses and cylinders, which is applied in the field of compasses used in teaching, can solve the problems of prone to errors in drawing, inconvenient rotation of compasses, and displacement activities, etc., and achieve the effects of reducing errors, saving time, and being convenient to carry

Inactive Publication Date: 2020-02-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the drawing process, when teachers use commonly used compasses to draw, often because the drawing position is too high and the size is too large, the fixed part of the compass will move when drawing, or the compass is inconvenient to rotate. Prone to error

Method used

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  • Compasses for teaching
  • Compasses for teaching
  • Compasses for teaching

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Embodiment Construction

[0018] The structural principle and working principle of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0019] see figure 1 , 2 , 3, 1, a kind of compasses for teaching, comprises fixed rod 1, and fixed rod 1 is connected with rotation rod 2 through connector 5; One side corresponding to fixed rod 1 and rotating rod 2 is provided with accommodating groove; There is a chute in the rod 2, and a sliding device 3 is installed on the chute; a cylinder 4 is arranged on the sliding device 3; the cylinder 4 is used for installing chalk.

[0020] The upper surface of the fixed rod 1 is provided with scale marks. The inside of the connecting piece 5 is hollow, which is used to determine the center of the circle. The sliding device 3 drives the cylinder 4 to slide to obtain the radius of the circle drawn. When the compasses are stored, the fixed rod 1 and the connecting end of the rotating rod 2 are inlaid in parallel,...

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Abstract

The invention discloses compasses for teaching. The compasses are characterized in that a fixed rod and a rotating rod are in head connection through a connecting part, the interior of the connectingpart is modeled in a hollow manner, and the position of a circle center is determined; a containing groove is formed in the fixed rod, the head of the fixed rod is in embedded connection with the rotating rod, a sliding groove is formed in the rotating rod, a sliding device is arranged in the sliding groove, a cylinder is embedded in the center of the sliding device, the cylinder is hollow and isused for embedding of chalk, size marks are arranged on the upper surface of the fixed rod, the sliding device drives the cylinder to slide to draw the radius of a circle, when the compasses are stored, the fixed rod and the rotating rod are in head parallel embedding, the tail of the rotating rod is embedded in the tail of the fixed rod, meanwhile, the sliding device enters the containing grooveof the fixed rod, and the cylinder on the sliding device is tangent to the fixed rod. The fixed rod and the rotating rod are matched to draw the arc, and the advantages of being high in drawing precision and stable in use are achieved.

Description

technical field [0001] The invention belongs to the technical field of compasses, in particular to a compass used for teaching. Background technique [0002] When drawing in classroom teaching, compasses are often used to standardize drawing. In the drawing process, when teachers use commonly used compasses to draw, often because the drawing position is too high and the size is too large, the fixed part of the compass will move when drawing, or the compass is inconvenient to rotate. prone to errors. Contents of the invention [0003] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a compass used for teaching, which solves the displacement error of the fixed part of the compass in the prior art, and has the characteristics of simple structure, simple operation and convenience. [0004] In order to achieve the above object, the technical solution adopted by the present invention is: a compass for tea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B43L9/02B43L9/24B43L9/16
CPCB43L9/02B43L9/16B43L9/24
Inventor 关瑛杜肖叶
Owner SHAANXI UNIV OF SCI & TECH
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