CN205381065U - Junior high school mathematics oval drawing compass of imparting knowledge to students - Google Patents

Abstract

The utility model discloses a junior high school mathematics oval drawing compass of imparting knowledge to students, including main scale board, vice chi board and fag end, the right side inner chamber of main scale board is equipped with vice chi board, and is equipped with centre of a circle hole in the middle part of the right side, the front and the back of main scale board all are equipped with the draw -in groove, and just vice chi board is " T " font structure, and the left side of its pair chi board is connected with the draw -in groove inner wall, the left side of main scale board all is equipped with with the right side of vice chi board and accepts the piece, the main scale board all is equipped with the adjustment tank with the front of vice chi board, the utility model discloses junior high school mathematics oval drawing compass of imparting knowledge to students for teaching drawing auxiliary teaching aid, can effectually make the teacher more accurate and vivid when drawing the ellipse for can give lessons to more audio -visual explanation of student during the teaching, can effectively improve the quality of giving lessons, this teaching aid simple structure of while, convenient to use.

Description

A kind of mathematics teaching in junior middle school ellipse drawing compass

Technical field

This utility model relates to teaching aid technical field, is specially a kind of mathematics teaching in junior middle school ellipse drawing compass.

Background technology

At present, mathematics is the section that during we impart knowledge to students junior middle school, drawing amount is maximum, aided drawing teaching aid for mathematical education has a lot, wherein ruler, set square and compasses, make several aids that we commonly use, but this kind of teaching aid is typically only capable to the drafting enough carrying out straight line and circle, can not carry out oval drafting, teacher's ellipse when giving lessons usually is drawn conveniently, its poor accuracy, can not be accurate and visual student is given lessons, the quality of strong influence teaching, though occurring in that relevant ellipse drawing aid on the market at present, but such instrument is for changeless owing to it regulates keycap, the needs when different size of ellipse drawn by needs, change the rope band of corresponding length, it is made to operate and for inconvenient.

Utility model content

The purpose of this utility model is in that to provide a kind of mathematics teaching in junior middle school ellipse drawing compass convenient to use.

nullFor achieving the above object，This utility model provides following technical scheme: a kind of mathematics teaching in junior middle school ellipse drawing compass，Including main scale plate、Secondary chi plate and rope band，The right side inner chamber of described main scale plate is provided with secondary chi plate，And right side central is provided with circle center hole，The front and back of described main scale plate is equipped with draw-in groove，And pair chi plate is " T " character form structure，The left side of its secondary chi plate is connected with draw-in groove inwall，The right side of the left side of described main scale plate and secondary chi plate is equipped with undertaking block，The front of described main scale plate and secondary chi plate is equipped with regulating tank，The inner chamber of the regulating tank on described main scale plate is provided with adjustment keycap one，The inner chamber of the regulating tank on described secondary chi plate is provided with adjustment keycap two，It is connected by rope band between described adjustment keycap one and adjustment keycap two，It is connected each through movable axis between described adjustment keycap one and the top and the rope band that regulate keycap two，And the inner chamber regulating keycap one and adjustment keycap two is equipped with spring card，One end of its spring card is connected with regulating tank inwall，The middle part of described rope band is provided with sliding shoe，It is provided with pulley between described sliding shoe and rope band，The inner chamber of described sliding shoe is provided with chalk jack.

Preferably, the both sides of described regulating tank are equipped with rule.

Compared with prior art, this utility model has the advantages that

(1), this utility model mathematics teaching in junior middle school ellipse drawing compass, for teaching drawing assistant teaching aid, can effectively make teacher more accurate and vivid when drawing oval, make student can to carry out explanation more intuitively when imparting knowledge to students to give lessons, the quality given lessons can be effectively improved, this teaching aid simple in construction simultaneously, easy to use, by the regulating tank arranged and adjustment keycap, effectively make this teaching aid can carry out drawing different size of ellipse figure according to the demand given lessons, greatly improve the practicality of this teaching aid.

(2), this utility model mathematics teaching in junior middle school ellipse drawing compass, regulate and be connected each through movable axis between keycap one and the top and the rope band that regulate keycap two, so make the rope band when drawing oval can be always maintained at identical length, make the more accurate of ellipse drawing, and the inner chamber regulating keycap one and adjustment keycap two is equipped with spring card, one end of its spring card is connected with regulating tank inwall, when so effectively can prevent from drawing ellipse, regulate keycap and occur mobile, affect the effect of ellipse drawing.

(3), this utility model mathematics teaching in junior middle school ellipse drawing compass, be provided with pulley between sliding shoe and rope band, convenient when drawing oval sliding shoe can effectively move according to rope band change so that the drafting of ellipse is more convenient.

Accompanying drawing explanation

Fig. 1 is this utility model plan structure schematic diagram；

Fig. 2 is this utility model side-looking structural representation.

In figure: 1 main scale plate, 2 secondary chi plates, 3 circle center holes, 4 regulating tanks, 5 adjustment keycaps one, 6 regulate keycap two, 7 rope band, 8 sliding shoes, 9 chalk jacks, 10 rules, 11 undertaking blocks.

Detailed description of the invention

Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of this utility model protection.

nullRefer to Fig. 1-2，This utility model provides a kind of technical scheme: a kind of mathematics teaching in junior middle school ellipse drawing compass，Including main scale plate 1、Secondary chi plate 2 and rope band 7，The right side inner chamber of described main scale plate 1 is provided with secondary chi plate 2，And right side central is provided with circle center hole 3，The front and back of described main scale plate 1 is equipped with draw-in groove，And pair chi plate 2 is " T " character form structure，The left side of its secondary chi plate 2 is connected with draw-in groove inwall，The right side of the left side of described main scale plate 1 and secondary chi plate 2 is equipped with undertaking block 11，The front of described main scale plate 1 and secondary chi plate 2 is equipped with regulating tank 4，The both sides of described regulating tank 4 are equipped with rule 10，The inner chamber of the regulating tank 4 on described main scale plate 1 is provided with adjustment keycap 1，The inner chamber of the regulating tank 4 on described secondary chi plate 2 is provided with adjustment keycap 26，It is connected by rope band 7 between described adjustment keycap 1 and adjustment keycap 26，It is connected each through movable axis between described adjustment keycap 1 and the top and the rope band 7 that regulate keycap 26，So make the rope band 7 when drawing oval can be always maintained at identical length，Make the more accurate of ellipse drawing，And the inner chamber regulating keycap 1 and adjustment keycap 26 is equipped with spring card，One end of its spring card is connected with regulating tank 4 inwall，When so effectively can prevent from drawing ellipse，Regulate keycap and occur mobile，Affect the effect of ellipse drawing，The middle part of described rope band 7 is provided with sliding shoe 8，It is provided with pulley between described sliding shoe 8 and rope band 7，When convenient drafting is oval, sliding shoe 8 effectively can change according to rope band 7 and move，The drafting making ellipse is more convenient，The inner chamber of described sliding shoe 8 is provided with chalk jack 9，This utility model mathematics teaching in junior middle school ellipse drawing compass，For teaching drawing assistant teaching aid，Can effectively make teacher more accurate and vivid when drawing oval，Make student can to carry out explanation more intuitively when imparting knowledge to students to give lessons，The quality given lessons can be effectively improved，This teaching aid simple in construction simultaneously，Easy to use，By the regulating tank 4 arranged and adjustment keycap，Effectively make this teaching aid can carry out drawing different size of ellipse figure according to the demand given lessons，Greatly improve the practicality of this teaching aid.

Operation principle: this mathematics teaching in junior middle school ellipse drawing compass, during use, chalk inserts from chalk jack 9, it is made to move along the maximum opening and closing limit of rope band 7 by manpower, owing to the two ends of rope band 7 are all connected with adjustment keycap, and it regulates keycap and is in stationary state, the movement of rope band 7 makes the change of its opening and closing yardstick occurrence law, reaches to draw oval purpose with this.

While there has been shown and described that embodiment of the present utility model, for the ordinary skill in the art, being appreciated that when without departing from principle of the present utility model and spirit and these embodiments can be carried out multiple change, amendment, replacement and modification, scope of the present utility model is defined by the appended claims and the equivalents thereof.

Claims (2)

1. null1. a mathematics teaching in junior middle school ellipse drawing compass，Including main scale plate (1)、Secondary chi plate (2) and rope band (7)，It is characterized in that: the right side inner chamber of described main scale plate (1) is provided with secondary chi plate (2)，And right side central is provided with circle center hole (3)，The front and back of described main scale plate (1) is equipped with draw-in groove，And pair chi plate (2) is " T " character form structure，The left side of its secondary chi plate (2) is connected with draw-in groove inwall，The right side of the left side of described main scale plate (1) and secondary chi plate (2) is equipped with undertaking block (11)，The front of described main scale plate (1) and secondary chi plate (2) is equipped with regulating tank (4)，The inner chamber of the regulating tank (4) on described main scale plate (1) is provided with adjustment keycap one (5)，The inner chamber of the regulating tank (4) on described secondary chi plate (2) is provided with adjustment keycap two (6)，It is connected by rope band (7) between described adjustment keycap one (5) and adjustment keycap two (6)，It is connected each through movable axis between described adjustment keycap one (5) and the top and the rope band (7) that regulate keycap two (6)，And the inner chamber regulating keycap one (5) and adjustment keycap two (6) is equipped with spring card，One end of its spring card is connected with regulating tank (4) inwall，The middle part of described rope band (7) is provided with sliding shoe (8)，It is provided with pulley between described sliding shoe (8) and rope band (7)，The inner chamber of described sliding shoe (8) is provided with chalk jack (9).
2. 2. a kind of mathematics teaching in junior middle school ellipse drawing compass according to claim 1, it is characterised in that: the both sides of described regulating tank (4) are equipped with rule (10).