Novel teaching compasses

Abstract

The invention discloses a pair of novel teaching compasses. A first compass support leg is provided with a slide groove and a fixing circle center. L-shaped clamping troughs are installed on the two sides of the first compass support leg symmetrically. A second compass support leg is in slide connection with the first compass support leg through the L-shaped clamping troughs. A fixing bead is installed at one end of the second compass support leg through a rotation shaft. The first compass support leg and the second compass support leg are both provided with through holes matched with the rotation shaft. One end of the rotation shaft penetrates through the through holes and is in thread connection with the rotation shaft end of a motor, and the other end of the rotation shaft is in thread connection with the fixing bead. A connection nut sleeve with an outer thread is installed at one end of the motor 6. An inner thread matched with the nut sleeve is arranged in the fixing circle center. The length of the rotation shaft is larger than the sum of the thicknesses of the first compass support leg, the second compass support leg and the L-shaped clamping troughs. The novel teaching compasses are novel in structure; the angle between the two support legs is adjusted through the motor; errors are avoided in the using process; the two support legs can rotate by 360 degrees. The novel teaching compasses is convenient to uses and is not liable to damage.

Description

technical field [0001] The invention relates to the field of teaching tools, in particular to a novel teaching compasses. Background technique [0002] Compasses are an indispensable teaching tool in teaching. The most common teaching compasses include a compass frame. One end of the compass frame is provided with a fixed pin for fixing a point, and the other end of the compass frame is provided with a placement sleeve for placing chalk. When in use, the fixing pins are inserted into the blackboard, and then the drawing is carried out, because most of the blackboards are made of wooden materials, so the blackboard will be damaged if used for a long time. In addition, compasses are placed in the classroom, if students play, there is a potential safety hazard. [0003] At the same time, traditional compasses directly adjust the distance between the two gauge rods and manually adjust the distance. Since the two gauge rods cannot be fixed, mistakes are easy to occur in the proc...

AI Technical Summary

Problems solved by technology

When using, insert the fixing pin into the blackboard, and then draw, because most of the blackboards are made of wooden materials, so the blackboard will be damaged if used for a long time

In addition, compasses are placed in the classroom, if students play, there will be safety hazards

[0003] At the same time, the traditional compass directly adjusts the distance between the two gauge rods and manually adjusts it. Since the two gauge rods cannot be fixed, it is easy to make mistakes during the use of the compasses.

[0004] Moreover, the traditional compasses cannot achieve 360-degree rotation between the two legs, and the use has certain limitations and is easy to damage

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