CN201816354U - Teaching aid - Google Patents

Abstract

A teaching aid mainly comprises a protractor, a disc, a pin with one convex end, a ruler with scales, a sliding sheet and a chalk. The protractor adopts a transparent circular tool with scales and is convenient to measure angles; the fixed disc is arranged in the central position of the protractor and connected with one end of the ruler through the pin; the ruler can rotate around the pin, one end of the ruler is connected with the pin, while the other end of the ruler is connected with the sliding sheet; and the chalk is fixed on the sliding sheet. The teaching aid can be used for drawing circles, arcs and linear lines, measuring the angles and the like and belongs to the mechanical drawing field.

Description

A kind of teaching aid

Technical field

The utility model relates to a kind of teaching aid, can draw circle, draws arc, draws straight line, take measurement of an angle etc., belongs to the mechanical drawing field.

Background technology

At present, school teacher looks like courses such as mathematics, physics especially in the process of giving lessons, and needs to draw, measure, and sometimes, a width of cloth figure needs multiple teaching aid to cooperate, and like this, not only bothers but also do not save time.For addressing the above problem, the utility model has designed a kind of teaching aid, and it is simple to operate, and is easy to carry, can satisfy teaching demand.

Summary of the invention

The technical solution of the utility model is: a kind of teaching aid, critical piece is made up of pin, the ruler that has scale, slide, chalk that protractor, disk, an end protrude.Protractor is the transparent circular tool that has scale, is convenient to take measurement of an angle, and the protractor centre bit is equipped with a fixed disc, one end of disk and ruler links by pin, and ruler can rotate round pin, and an end of ruler is connected with pin, the other end is connected with slide, and chalk is fixed on the slide.During use, if measure angle of triangle, the central point of pin can be fixed on the both sides intersection point, ruler is put the protractor zero graduation also to be overlapped on one side with the amount for the treatment of triangle, protractor is fixed and is rotated ruler and the coincidence of the triangle other end then, ruler indicated scale on protractor is exactly a triangular angles to be measured, and the angle of measuring circular arc is just no longer narrated here with measuring reason of triangular angles.In the time of measured angular, pin projection and chalk are outwardly with respect to blackboard, when we draw circle or circular arc, the end that end that chalk is outstanding and pin protrude just will turn over turnback before and after this educational aid in blackboard, the pin projection is fixed on the round dot of circle to be painted, mobile slide, move to the somewhere according to need picture radius of circle, rotation ruler, chalk just on blackboard, draw mutually deserved circle or circular arc.

Description of drawings

Accompanying drawing is a structural representation of the present utility model

The specific embodiment

With reference to accompanying drawing, a kind of teaching aid, critical piece is made of pin 3, the ruler 4 that has scale, slide 5, the chalk 6 that protractor 1, disk 2, an end protrude.Protractor 1 is the transparent circular tool that has scale, be convenient to take measurement of an angle, the protractor centre bit is equipped with a fixed disc 2, one end of disk 2 and ruler 4 links by pin 3, ruler 4 can be round pin 3 rotations, one end of ruler 4 is connected with pin 3, and the other end is connected with slide 5, and chalk 6 is fixed on the slide 5.During use, if measure angle of triangle, the central point of pin 3 can be fixed on the both sides intersection point, ruler 4 is put the protractor zero graduation also to be overlapped on one side with the amount for the treatment of triangle, protractor 1 is fixed and is rotated ruler and the coincidence of the triangle other end then, ruler 4 indicated scale on protractor 1 is exactly a triangular angles to be measured, and the angle of measuring circular arc is just no longer narrated here with measuring reason of triangular angles.In the time of measured angular, sell 3 projections and chalk 6 is outwardly with respect to blackboard, when we draw circle or circular arc, the end that end that chalk 6 is outstanding and pin 3 protrude just will turn over turnback before and after this educational aid in blackboard, sell on the round dot that 3 projections are fixed on circle to be painted, mobile slide 5, move to the somewhere according to need picture radius of circle, rotation ruler 4, chalk 6 just draw on blackboard and justify accordingly or circular arc.

Claims (1)

1. teaching aid, its technical characterictic is: the pin (3) that it is protruded by protractor (1), disk (2), an end, the ruler (4) that has scale, slide (5), chalk (6) constitute, protractor (1) is the transparent circular tool that has scale, protractor (1) centre bit is equipped with a fixed disc (2), one end of disk (2) and ruler (4) links by pin (3), ruler (4) can rotate round pin (3), one end of ruler (4) is connected with pin (3), the other end is connected with slide (5), and chalk (6) is fixed on the slide (5).

Images