CN204732024U - The teaching aid of circle, circular arc girth in a kind of mathematics - Google Patents
The teaching aid of circle, circular arc girth in a kind of mathematics Download PDFInfo
- Publication number
- CN204732024U CN204732024U CN201520432325.7U CN201520432325U CN204732024U CN 204732024 U CN204732024 U CN 204732024U CN 201520432325 U CN201520432325 U CN 201520432325U CN 204732024 U CN204732024 U CN 204732024U
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- CN
- China
- Prior art keywords
- index dial
- circle
- fixed arm
- teaching aid
- circular arc
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- Expired - Fee Related
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Abstract
A kind of teaching aid contributing to circle, circular arc girth in mathematics, comprise index dial, fixed arm, lever arm, described index dial is rounded, the arc top place of index dial is provided with chute, and index dial is provided with the line of rabbet joint of some circumferentially shapes, and the line of rabbet joint is provided with length scale, the inner of described fixed arm and lever arm is articulated with the center of circle of index dial, the circle centre position of index dial is provided with angle line, and the outer end of fixed arm is provided with hasp, and fixed arm surface is provided with length scale.Compared with existing language teaching, dramatic image, can show the relation of circular constant and circumference, arc length with material object, contribute to student and understand this type of abstract problem; This teaching aid structure is simple, and cost is lower, easily operates, and has wider application prospect.
Description
Technical field
The utility model relates to a kind of teaching aid, is exactly specifically circle, circular arc teaching aid in a kind of mathematics.
Background technology
The circumference calculating problem of circle and circular arc is often related in mathematics teaching in junior middle school, mathematics is an abstract subject, the understanding of the girth of circle, circular arc depends on the development of student's abstract thinking, especially the problem of circular constant, especially the development of schoolgirl's abstract thinking ability is more slow for partial students, or abstract thinking ability is inadequate, when understanding problems, teacher is often through language teaching, it is clear to be difficult to abstract problem to describe, language teaching is vivid not, usually runs into puzzlement, have impact on the study of student.
For above problem, be necessary to provide a kind of teaching aid contributing to circle, circular arc girth in mathematics.
Summary of the invention
The purpose of this utility model is to provide a kind of teaching aid contributing to circle, circular arc girth in mathematics better to understand problems in order to help student.
The technical scheme in the invention for solving the technical problem is:
A kind of teaching aid contributing to circle, circular arc girth in mathematics, comprise index dial, fixed arm, lever arm, it is characterized in that, described index dial is rounded, the arc top place of index dial is provided with chute, and index dial is provided with the line of rabbet joint of some circumferentially shapes, and the line of rabbet joint is provided with length scale, the inner of described fixed arm and lever arm is articulated with the center of circle of index dial, and the circle centre position of index dial is provided with angle line; The outer end of fixed arm is provided with hasp, fixed arm surface is provided with length scale, fixed arm inside is the cavity of hollow, and cavity side is provided with the notch of hollow out, and in cavity, two ends are provided with support, rotating shaft is provided with between support, support and rotating shaft junction are provided with spring, and rotating shaft is wound with opaque cloth, cloth is externally connected with withdrawing roll in notch, withdrawing roll is connected in lever arm, and on cloth, the corresponding different line of rabbet joint arranges different tag lines; Lever arm end is provided with runner, and runner is placed in the chute on arc top, and runner is provided with lock pin.
As optimization, the arc length of described cloth is not more than the length of rotating shaft.
As optimization, described withdrawing roll is provided with scale value.
As optimization, described cloth launches in fan-shaped.
As optimization, described cloth outer arc length is not more than the girth of index dial.
As optimization, the cloth both sides color of described markings is inconsistent.
The beneficial effects of the utility model are: compared with existing teaching aid, dramatic image, the relation of circular constant and circumference, arc length can be shown with material object, contribute to student and understand this type of abstract problem; This teaching aid structure is simple, and cost is lower, easily operates, and has wider application prospect.
Accompanying drawing explanation
Fig. 1 is structural drawing of the present utility model.
In figure: 1-index dial, the 2-line of rabbet joint, 3-fixed arm, 4-lever arm, the 5-center of circle, 6-hasp, 7-support, 8-rotating shaft, 9-runner, 10-withdrawing roll.
Embodiment
As shown in Figure 1, a kind of teaching aid contributing to circle, circular arc girth in mathematics, comprise index dial, fixed arm, lever arm, it is characterized in that, described index dial is rounded, and the arc top place of index dial is provided with chute, index dial is provided with the line of rabbet joint of some circumferentially shapes, the line of rabbet joint is provided with length scale, and the inner of described fixed arm and lever arm is articulated with the center of circle of index dial, and the circle centre position of index dial is provided with angle line; The outer end of fixed arm is provided with hasp, fixed arm surface is provided with length scale, fixed arm inside is the cavity of hollow, and cavity side is provided with the notch of hollow out, and in cavity, two ends are provided with support, rotating shaft is provided with between support, support and rotating shaft junction are provided with spring, and rotating shaft is wound with opaque cloth, cloth is externally connected with withdrawing roll in notch, withdrawing roll is connected in lever arm, and on cloth, corresponding different line of rabbet joint place arranges different tag lines; Lever arm end is provided with runner, and runner is placed in the chute on arc top, and runner is provided with lock pin.
As optimization, the radius length of described cloth is not more than the length of rotating shaft.
As optimization, described withdrawing roll is provided with scale value.
As optimization, described cloth launches in fan-shaped.
As optimization, as optimization, the cloth both sides color of described markings is inconsistent.
Before using, open the hasp of fixed arm and lever arm end, withdrawing roll is connected in lever arm, hand presses lever arm, drives runner to slide along the line of rabbet joint, drives cloth to shift out hollow cavity when lever arm moves;
The part that cloth covers is the circular arc of index dial or whole index dial, the position that lever arm arrives, i.e. the length of circular arc, and the ratio of the length scale value on arc length value and fixed arm corresponding to the line of rabbet joint is circular constant; The girth of circular arc when the cloth length of different colours can identify different radii.
Above-mentioned embodiment is only concrete case of the present invention; scope of patent protection of the present invention includes but not limited to product form and the style of above-mentioned embodiment; any a kind of food meeting claims of the present invention automatically cool production line and any person of an ordinary skill in the technical field to its suitable change done or modification, all should fall into scope of patent protection of the present invention.
Claims (5)
1. one kind contributes to circle in mathematics, the teaching aid of circular arc girth, comprise index dial, fixed arm, lever arm, it is characterized in that, described index dial is rounded, the arc top place of index dial is provided with chute, index dial is provided with the line of rabbet joint of some circumferentially shapes, the line of rabbet joint is provided with length scale, the inner of described fixed arm and lever arm is articulated with the center of circle of index dial, the circle centre position of index dial is provided with angle line, the outer end of fixed arm is provided with hasp, fixed arm surface is provided with length scale, fixed arm inside is the cavity of hollow, in cavity, two ends are provided with support, rotating shaft is provided with between support, support and rotating shaft junction are provided with spring, rotating shaft is wound with opaque cloth, lever arm end is provided with runner, runner is placed in the chute on arc top, runner is provided with lock pin.
2. a kind of teaching aid contributing to circle, circular arc girth in mathematics according to claim 1, it is characterized in that, the arc length of described cloth is not more than the length of rotating shaft.
3. a kind of teaching aid contributing to circle, circular arc girth in mathematics according to claim 1, it is characterized in that, described index dial is plastic material.
4. a kind of teaching aid contributing to circle, circular arc girth in mathematics according to claim 1, it is characterized in that, described cloth launches in fan-shaped.
5. a kind of teaching aid contributing to circle, circular arc girth in mathematics according to claim 1, it is characterized in that, described cloth outer arc length is not more than the girth of index dial.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520432325.7U CN204732024U (en) | 2015-06-23 | 2015-06-23 | The teaching aid of circle, circular arc girth in a kind of mathematics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520432325.7U CN204732024U (en) | 2015-06-23 | 2015-06-23 | The teaching aid of circle, circular arc girth in a kind of mathematics |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204732024U true CN204732024U (en) | 2015-10-28 |
Family
ID=54390359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520432325.7U Expired - Fee Related CN204732024U (en) | 2015-06-23 | 2015-06-23 | The teaching aid of circle, circular arc girth in a kind of mathematics |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204732024U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106128232A (en) * | 2016-08-29 | 2016-11-16 | 南京工业职业技术学院 | A kind of variable element circle fan annular demonstration and arc length area measuring device |
| CN107103817A (en) * | 2017-06-22 | 2017-08-29 | 张元平 | For demonstrate sphere longitude and latitude it is different 2 points between arc length teaching aid |
-
2015
- 2015-06-23 CN CN201520432325.7U patent/CN204732024U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106128232A (en) * | 2016-08-29 | 2016-11-16 | 南京工业职业技术学院 | A kind of variable element circle fan annular demonstration and arc length area measuring device |
| CN106128232B (en) * | 2016-08-29 | 2022-04-01 | 南京工业职业技术学院 | Variable parameter circular fan annular demonstration and arc length area measurement device |
| CN107103817A (en) * | 2017-06-22 | 2017-08-29 | 张元平 | For demonstrate sphere longitude and latitude it is different 2 points between arc length teaching aid |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151028 Termination date: 20160623 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |