Aluminum-molybdenum alloy round groove corner pointer same plane teaching triangular board

Abstract

The invention relates to special teaching aids for teaching and in particular to an aluminum molybdenum alloy circular-groove corner-pointer coplanar teaching set square. According to improvement, the set square is characterized in that the upper surface of a rotating disc part is provided with an arch-shaped protruding beam, the lower surface of the rotating disc part is a lower sliding plane, and the upper surface of a ruler plate part is an upper plane of the ruler plate; the lower sliding plane is provided with a sliding through hole, and the upper plane of the ruler plate is provided with a ruler plate step hole; the upper plane of the ruler plate is provided with a circular protruding rail; a centrosymmetric transition protruding strip is arranged between the circular protruding rail and the upper scale plane; the lower sliding plane is provided with a circular groove, and a centrosymmetric transition groove is formed between the circular groove and the lower sliding plane; corner scales are formed on the upper plane of the ruler plate, the rotating disc part is provided with a rotating disc chamfer, and the rotating disc chamfer is provided with a corner pointer; the inner side of the upper plate of the ruler plate is provided with a scale slope, and the scale slope is further engraved with length scales; and a shaft pin rivet sequentially penetrates the sliding through hole and the ruler plate step hole, and the lower sliding plane is in butt joint onto the upper plane of the ruler plate in a rotating manner through the shaft pin rivet. The aluminum molybdenum alloy circular-groove corner-pointer coplanar teaching set square has the beneficial effects of being changeable in size and angle and the like.

Description

technical field [0001] The invention relates to a special teaching aid for teaching, and the international patent classification is B43L, in particular to an aluminum-molybdenum alloy circular groove corner pointer coplanar teaching triangular plate. Background technique [0002] Mathematics is one of the important subjects. In junior high school mathematics, trigonometry is the most important. Learning trigonometry well is the most important basis for plane geometry in junior high school and solid geometry in high school. [0003] At present, in teaching, there are rulers, triangular rulers, etc. for teaching geometry. They have many disadvantages: they are inconvenient to carry, inconvenient to use, and more importantly, they have single functions. When teaching drawing, users can only draw the graphics they need step by step on the basis of online. The drawing process is cumbersome and not intuitive, and it cannot better cultivate students' association, analogy, observat...

AI Technical Summary

Problems solved by technology

[0003] At present, in teaching, there are rulers, triangular rulers, etc. in teaching geometry. They have many disadvantages: they are inconvenient to carry, inconvenient to use, and more importantly, they have a single function.

When teaching drawing, users can only draw the graphics they need step by step on the basis of online. The drawing process is cumbersome and not intuitive, and it cannot better cultivate students' association, analogy, observation and hands-on ability. It is very busy to draw and speak, which adds great difficulty to the educators

Chinese patent: adjustable triangular ruler (patent number: 2011200369592), but it is impossible to ensure that the three rods are on the same plane, and there is a large error. Another Chinese patent: adjustable multi-purpose four-pole ruler (patent number: 2013201682530), is also It is impossible to make the four rulers on the same plane, and there is still a large error; there is also a Chinese patent: multi-functional teaching ruler (patent number: 2014208739549), it is still impossible to make all the rulers on the same plane, there are relatively large big error

Images