Aluminium molybdenum alloy circular groove corner pointer adjusting teaching set square

Abstract

The invention relates to a special teaching set square and in particular relates to a aluminium molybdenum alloy circular groove corner pointer adjusting teaching set square which is characterized in that hole plane hasps are arranged on edge set square stepped holes; stepped screws comprise screw large head ends and screw cylindrical sections; screw plane hasps are arranged on the inner planes of the screw large head ends; one ends of cylinder springs are fixed on the screw plane hasps; the other ends of the cylinder springs are fixed on the hole plane hasps; the stepped screws pass through rotation through holes and the edge set square stepped holes in sequence; butterfly-shaped nuts are in fit with the outer thread ends of the stepped screws; the lower planes of sliding plates are in lapping joint on the upper planes of edge set squares in a rotation manner; the stepped screws are in clearance fit with the rotation through holes and the edge set square stepped holes; one ends of the cylinder springs are fixed on the screw plane hasps; the other ends of the cylinder springs are fixed on the hole plane hasps; butterfly-shaped spokes are supported on screw stepped surfaces; and by combination of the adjusting function of butterfly-shaped nuts, the rotation can be realized in a state that frictional resistance exists in the upper plane of the edge set square in each movable plate and the lower plane of the corresponding sliding plate.

Description

technical field [0001] The invention relates to a special triangle plate for teaching, and the international patent classification is B43L, in particular to an aluminum-molybdenum alloy circular groove corner pointer adjustment teaching triangle 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, obse...

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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