Triangle instrument which is provided with aluminium-chromium alloy step slot corner pointer and is adjustable in the same plane

Abstract

The invention relates to a special triangle instrument for the teaching field, and specifically relates to a triangle instrument which is provided with an aluminium-chromium alloy step slot corner pointer and is adjustable in the same plane. As the improvement, an upper contour of a rotary disk is provided with an arched convex beam; an upper plane of an edge scale is provided with a step convex trail; a transition convex bar is arranged between the step convex trail and the upper plane of the edge scale, and is centrosymmetric; a step groove is formed in a lower plane of a sliding plate; a transition groove is arranged between the step groove and the lower plane of the sliding plate, and is centrosymmetric; ball base step holes are formed in the lower plane of the sliding plate, and are symmetrically arranged at two sides of the transition groove; the outer protruding sphere of the outer side surface of a sliding ball base on an outer half piece of the sliding ball base on the sliding ball touches the upper plane of the edge scale sliding plate; the step groove on each movable plate is slidingly coordinated with the step convex trail on the adjacent movable plate; and specifically on the upper plane corner scales of the edge scale are corresponding to a corner pointer on the back of the lower plane of the sliding plate on the location so that the rotation angle between the rotary disk part and the scale plate part can be controlled conveniently and visually.

Description

technical field [0001] The invention relates to a special cam for teaching, and the international patent classification is B43L, in particular to an aluminum-chromium alloy stepped groove corner pointer adjustable on the same plane as a demo cam. 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, observatio...

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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