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An adjustable compasses for mathematics teaching

An adjustable and mathematical technology, applied to circular curve plotters, printing, writing utensils, etc., can solve problems such as limited, easy-to-loose compasses drawing range, large-scale toe opening angle, etc., to achieve convenient use and simple structure , the effect of increasing the range

Active Publication Date: 2020-10-02
NANYANG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide an adjustable compasses for mathematics teaching in view of the problems existing in the prior art. This compass solves the problems that the traditional compass has a large opening angle, the tip of the compass is easy to loosen and the compass has a limited drawing range.

Method used

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  • An adjustable compasses for mathematics teaching
  • An adjustable compasses for mathematics teaching
  • An adjustable compasses for mathematics teaching

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 Shown is a structural schematic diagram of an adjustable compasses for mathematics teaching, including a fixed deck 2, two legs 1 and a cantilever 3 fixed on the top of the fixed deck 2, each leg 1 upper end is provided with an end face abutment On the fitting plate 7 on the inner wall of the fixed deck 2, the end face of the fitting plate 7 near the inner wall of its fixed deck 2 is provided with a spiral-shaped grinding-increasing protrusion 8, as Figure 5 As shown, the fitting plate 7 runs through the first rotating rod shaft 6, and the setting of the grinding-increasing protrusion 8 can increase the friction between the fitting plate 7 and the inner wall of the fixed holder 2, and can maintain a stable state when the two legs 1 are stretched apart to avoid The drawing is incorrect due to the looseness of the two legs 1 when drawing a circle. The upper ends of the two legs 1 are articulated on the fixed card base 2 through the first rotating rod sh...

Embodiment 2

[0032] The difference from Embodiment 1 is that the outer wall of the brush installation tube 11 is fixedly provided with a screw sleeve 16, such as image 3 As shown, the rod wall of the second rotating rod shaft 15 is fixed with a screw rod 17 matched with the screw sleeve 16, so that the paintbrush installation tube 11 can be detachably installed with a paintbrush without the need for the entire compass to pick up the installation paintbrush. The outer wall of the paintbrush installation tube 11 The fastening screw 13 for fastening the paintbrush is arranged on the top, the fastening screw 13 for fastening the paintbrush is arranged on the outer wall of the paintbrush installation cylinder 11, and the lower end of the end of the paintbrush installation cylinder 11 is fixedly provided with a lower port tightening End sleeve 12, the outer wall of the end sleeve 12 is provided with a plurality of tightening strips extending to its lower port, when the end sleeve 12 is sleeved o...

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PUM

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Abstract

The invention belongs to the technical field of tools for mathematical teaching, and particularly relates to adjustable compasses for mathematical teaching. The compass comprises a fixing clamping base, two supporting legs and a cantilever, wherein the upper ends of the two supporting legs are movably hinged to the fixing clamping base through a first rotating rod shaft, and a brush installing barrel used for fixing a paintbrush is installed at the end part, far away from the fixing clamping base, of one of the supporting legs, the side wall of the brush installing barrel is movably hinged tothe end part of the supporting legs through a second rotating rod shaft, a connecting base and a compass tip fixed on the connecting base are installed at the end part, far away from the fixing clamping base, of the other supporting leg, and the supporting base is arranged on the connecting base in a sleeve mode. The compass has the advantages that the structure is simple, the structure is simple,the adjustable range of drawing by the compass can be large, the drawing is clear, the compass tip can be prevented from being easily loosened, and the compass is convenient to use.

Description

technical field [0001] The invention belongs to the technical field of tools for teaching mathematics, and in particular relates to an adjustable compasses for teaching mathematics. Background technique [0002] In the study of mathematics, especially the study of geometric knowledge, it is often necessary to draw geometric figures. For the drawing of circular patterns, a specific tool must be used, that is, a compass; compasses are made of metal materials and plastics, etc. , The compass has two feet, one is a fixed gauge foot, and the other is a rotating gauge foot, wherein the end of the fixed gauge foot is provided with a metal needle, and the metal needle determines the position of the center of the circle. [0003] In the process of mathematics teaching, the size of the compasses used is relatively large. After the center of the circle is determined by the fixed gauge feet, the rotating gauge feet will be stretched apart. It is easy to loosen and cause the brush to to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B43L9/24B43L9/16B43L9/02
CPCB43L9/02B43L9/16B43L9/24
Inventor 宋亮曾铄寓李满王萌陈绍东
Owner NANYANG INST OF TECH