CN203799526U - Device for demonstrating positional relation between circles - Google Patents
Device for demonstrating positional relation between circles Download PDFInfo
- Publication number
- CN203799526U CN203799526U CN201420113657.4U CN201420113657U CN203799526U CN 203799526 U CN203799526 U CN 203799526U CN 201420113657 U CN201420113657 U CN 201420113657U CN 203799526 U CN203799526 U CN 203799526U
- Authority
- CN
- China
- Prior art keywords
- connecting rod
- rotating shaft
- circle
- circles
- disk
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Instructional Devices (AREA)
Abstract
The utility model belongs to the field of education, and particularly relates to improvements on the structure of a device for demonstrating the positional relation between circles. The device provided by the utility model for demonstrating the positional relation between the circles can demonstrate the positional relation between the circles flexibly and can be used for assigning exercises for students. The device for demonstrating the positional relation between the circles is characterized in that one end of a first connecting rod is provided with a circular through hole, and an elongated through hole is arranged in the first connecting rod at the side of the circular through hole; a first circular plate is provided with a first rotating shaft at the central position, the first rotating shaft penetrates through the circular through hole and is connected with one end of a third connecting rod; a second circular plate is provided with a second rotating shaft at the central position, and the second rotating shaft penetrates through the elongated through hole in the first connecting rod and is connected with one end of a second connecting rod; and the other end of the second connecting rod is connected with the other end of the third connecting rod through a third rotating shaft, the third rotating shaft is provided with a protractor used for measuring an angle between the second connecting rod and the third connecting rod, and the first connecting rod is provided with graduations.
Description
Technical field
The utility model belongs to education sector, especially relates to the improvement of the position relationship demonstration device structure of a kind of circle and circle.
Background technology
Junior Mathematics relates to the course of the position relationship of circle and circle, general teacher is the explanation of drawing on blackboard at school time, but the explanation of drawing exists and cannot change flexibly circle and cause the low and student of efficiency of teaching to understand difficult problem with the problem of the position relationship of circle.In addition, teacher draws and justifies while going out exercise with the position relationship of circle to student on blackboard, and each figure can only calculate once, cannot convert in time the condition of setting a question and strengthen exercise.
Summary of the invention
The utility model is exactly for the problems referred to above, provides one can demonstrate flexibly circle and circle position relationship, and can be used for arranging a kind of circle of exercise and the position relationship demonstration device of circle to student.
For achieving the above object, the utility model adopts following technical scheme, the utility model comprises the first disk, the second disk, first connecting rod, second connecting rod and third connecting rod, its structural feature is: one end of first connecting rod is provided with manhole, on the side of manhole, first connecting rod, is provided with strip open-work; Be provided with the first rotating shaft at the first disc centre place, the first rotating shaft is connected with one end of third connecting rod through after manhole; The second disc centre place is provided with the second rotating shaft, and the second rotating shaft is connected with one end of second connecting rod after passing the strip open-work on first connecting rod; The other end of second connecting rod is connected by the 3rd rotating shaft with the other end of third connecting rod, is provided with the protractor for measuring second connecting rod and third connecting rod angle in the 3rd rotating shaft, is provided with scale on first connecting rod.
As a kind of preferred version, the first disk, the second disk, first connecting rod, second connecting rod and third connecting rod are timber products; Timber products cost is low and lightweight, easy to use.
Further, can be above the 3rd rotating shaft coupling hook; Can circle and the position relationship demonstration device of circle be hung by hook.
The utility model beneficial effect.
1, can demonstrate flexibly the position relationship of circle and circle.
One end of the utility model first connecting rod is provided with manhole, on the side of manhole, first connecting rod, is provided with strip open-work; Be provided with the first rotating shaft at the first disc centre place, the first rotating shaft is connected with one end of third connecting rod through after manhole; The second disc centre place is provided with the second rotating shaft, and the second rotating shaft is connected with one end of second connecting rod after passing the strip open-work on first connecting rod; The other end of second connecting rod is connected by the 3rd rotating shaft with the other end of third connecting rod; Can be by adjusting the angle between position and second connecting rod and the third connecting rod of the second rotating shaft in strip open-work, make the first disk and the second disk realize tangent or from, be convenient to student and understand two concepts that circle is tangent.
2, be convenient to go out exercise to student.
The utility model is provided with the protractor for measuring second connecting rod and third connecting rod angle in the 3rd rotating shaft, is provided with scale on first connecting rod; Understand two length between the round heart by the length scale on first connecting rod, throughput hornwork is understood the angle between second connecting rod and third connecting rod, measure again the length of second connecting rod and third connecting rod, so just can coordinate the angle and adjustment the second rotating shaft that regulate between second connecting rod and third connecting rod to drive the position class of second connecting rod on first connecting rod to go out to calculate the exercise question such as angle or the position of second connecting rod on first connecting rod to student by several conditions of hiding wherein; And can adjust easily angle and the position of second connecting rod on first connecting rod converts exercise question, be applicable to very much student's exercise.
3, simple in structure, be convenient to produce.
One end of the utility model first connecting rod is provided with manhole, on the side of manhole, first connecting rod, is provided with strip open-work; Be provided with the first rotating shaft at the first disc centre place, the first rotating shaft is connected with one end of third connecting rod through after manhole; The second disc centre place is provided with the second rotating shaft, and the second rotating shaft is connected with one end of second connecting rod after passing the strip open-work on first connecting rod; The other end of second connecting rod is connected by the 3rd rotating shaft with the other end of third connecting rod, is provided with the protractor for measuring second connecting rod and third connecting rod angle in the 3rd rotating shaft, is provided with scale on first connecting rod; Member is few, simple in structure, and institute is so that produce.
Brief description of the drawings
Fig. 1 is the utility model structural representation.
In figure, 1 is that the first disk, 2 is that the first rotating shaft, 3 is that third connecting rod, 4 is that the 3rd rotating shaft, 5 is that hook, 6 is that protractor, 7 is that second connecting rod, 8 is that the second disk, 9 is that the second rotating shaft, 10 is that strip open-work, 11 is first connecting rod.
Embodiment
As shown in Figure 1, the utility model comprises the first disk 1, the second disk 8, first connecting rod 11, second connecting rod 7 and third connecting rod 3, and one end of first connecting rod 11 is provided with manhole, on the side of manhole, first connecting rod 11, is provided with strip open-work 10; Be provided with the first rotating shaft 2, the first rotating shafts 2 is connected with one end of third connecting rod 3 through after manhole in the first disk 1 center; The second disk 8 centers are provided with the second rotating shaft 9, the second rotating shafts 9 and are connected with one end of second connecting rod 7 after through the strip open-work 10 on first connecting rod 11; The other end of the other end of second connecting rod 7 and third connecting rod 3 is connected by the 3rd rotating shaft 4, is provided with the protractor 6 for measuring second connecting rod 7 and third connecting rod 3 angles in the 3rd rotating shaft 4, on first connecting rod 11, is provided with scale.
The first disk 1, the second disk 8, first connecting rod 11, second connecting rod 7 and third connecting rod 3 are timber products; Timber products cost is low and lightweight, easy to use.
Can be above the 3rd rotating shaft 4 coupling hook 5; Can circle and the position relationship demonstration device of circle be hung by linking up with 5.
Claims (2)
1. the position relationship demonstration device of circle and circle, comprise the first disk (1), the second disk (8), first connecting rod (11), second connecting rod (7) and third connecting rod (3), it is characterized in that: one end of first connecting rod (11) is provided with manhole, on the side of manhole, first connecting rod (11), be provided with strip open-work (10); Be provided with the first rotating shaft (2) in the first disk (1) center, the first rotating shaft (2) is connected with one end of third connecting rod (3) through after manhole; The second disk (8) center is provided with the second rotating shaft (9), and the second rotating shaft (9) is connected with one end of second connecting rod (7) through the strip open-work (10) on first connecting rod (11) is rear; The other end of the other end of second connecting rod (7) and third connecting rod (3) is connected by the 3rd rotating shaft (4), in the 3rd rotating shaft (4), be provided with the protractor (6) for measuring second connecting rod (7) and third connecting rod (3) angle, on first connecting rod (11), be provided with scale.
2. the position relationship demonstration device of circle according to claim 1 and circle, is characterized in that: be connected with hook (5) in the 3rd rotating shaft (4) top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420113657.4U CN203799526U (en) | 2014-03-10 | 2014-03-10 | Device for demonstrating positional relation between circles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420113657.4U CN203799526U (en) | 2014-03-10 | 2014-03-10 | Device for demonstrating positional relation between circles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203799526U true CN203799526U (en) | 2014-08-27 |
Family
ID=51381723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420113657.4U Expired - Fee Related CN203799526U (en) | 2014-03-10 | 2014-03-10 | Device for demonstrating positional relation between circles |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203799526U (en) |
-
2014
- 2014-03-10 CN CN201420113657.4U patent/CN203799526U/en not_active Expired - Fee Related
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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: 20140827 Termination date: 20150310 |
|
| EXPY | Termination of patent right or utility model |