Aluminum-nickel alloy V-shaped groove through hole rotation angle co-planar teaching triangular ruler

Abstract

The invention relates to a special teaching aid for teaching, in particular, an aluminum-nickel alloy V-shaped groove through hole rotation angle co-planar teaching triangular ruler. The lower surface of a sliding part is a sliding lower plane; the upper surface of an edge ruler part is an edge ruler upper plane; a sliding through hole is formed in the sliding lower plane; an edge step hole is formed in the edge ruler upper plane; the sliding lower plane is provided with a V-shaped protruding rail; the edge ruler upper plane is provided with a V-shaped groove; rotation angle view holes are formed in the edge ruler upper plane; the inner side of the edge ruler upper plane is provided with a scale slope; length scales are engraved on the scale slope; a shaft pin rivet passes through the sliding through hole and the edge ruler step hole, so that the sliding lower plane can be in sliding lap joint with the edge ruler upper plane through the shaft pin rivet; and the edge ruler upper plane is provided with rotation angle scales which are corresponding to the rotation angle view holes in the sliding lower plane. With the aluminum-nickel alloy V-shaped groove through hole rotation angle co-planar teaching triangular ruler adopted, a rotation angle between the sliding part and the edge ruler part can be controlled conveniently and intuitively. The aluminum-nickel alloy V-shaped groove through hole rotation angle co-planar teaching triangular ruler is advantageous in variability in demonstration size and angle.

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-nickel alloy V-shaped groove through-hole corner coplanar teaching triangle ruler. 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, observa...

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

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