CN203102681U - Circumference ratio demonstrator - Google Patents
Circumference ratio demonstrator Download PDFInfo
- Publication number
- CN203102681U CN203102681U CN 201320117583 CN201320117583U CN203102681U CN 203102681 U CN203102681 U CN 203102681U CN 201320117583 CN201320117583 CN 201320117583 CN 201320117583 U CN201320117583 U CN 201320117583U CN 203102681 U CN203102681 U CN 203102681U
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- China
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- gear
- disk
- demonstrator
- circumference ratio
- installation shaft
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- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The utility model discloses a circumference ratio demonstrator. The circumference ratio demonstrator comprises a frame body (1); a vertical rod (2) with a sliding chute is fixedly arranged at the upper part of the frame body (1); a circular disc (3) is installed in the sliding chute of the vertical rod (2) through a mounting shaft (4); a gear (5) is also installed on the mounting shaft (4) on the right side of the circular disc (3); a positioning pin (6) temporarily fixed with the circular disc (3) is arranged on the gear (5); a transparent rule (8) is arranged at the bottom of the circular disc (3) in a staggered way; and a rack (9) meshed with the gear (5) is arranged on the upper surface of the transparent rule (8). By adopting the structure, the effect that the circumference ratio demonstrator is convenient to operate and helps students understand and memorize the circumference ratio through demonstration is realized.
Description
Technical field
The utility model relates to a kind of demonstrator for teaching, relates in particular to a kind of circular constant demonstration device.
Background technology
At present, in the mathematical education process, especially when study circular constant one joint, the student feels bad understanding to the relation of these abstract circumferences and radius, often memorize mechanically numerical value, also do not use at present the mode of teaching aid demonstration that indigestibility, difficult memory circular constant are carried out teaching demonstration, help the student to understand and remember in mode intuitively.
Summary of the invention
The purpose of this utility model provides a kind of simple in structure, and convenience easy to operate is by demonstrating the circular constant demonstration device that can help the student to understand and remember.
A kind of circular constant demonstration device of the technical solution of the utility model, it comprises support body 1, it is characterized in that: the montant 2 that is fixed with the band chute on the top of described support body 1, in the chute of described montant 2, disk 3 is installed by installation shaft 4, on described installation shaft 4 and on the right side of described disk 3, gear 5 is installed, on described gear 5, be provided with the register pin 6 temporary fixed with described disk 3, the staggered transparent ruler 8 that is provided with in the bottom of described disk 3 is provided with the tooth bar 9 that is meshed with described gear 5 at the upper surface of described transparent ruler 8.
The technical solution of the utility model also has on described installation shaft 4 and an end of contiguous described gear 5 is equipped with clamp nut 7.
The technical solution of the utility model also has described disk 3 to be provided with the zero graduation line, and this zero graduation line aligns with the zero graduation line of described transparent ruler 8.
The beneficial effects of the utility model are the montants 2 that are fixed with the band chute by the top at described support body 1, in the chute of described montant 2, disk 3 is installed by installation shaft 4, on described installation shaft 4 and on the right side of described disk 3, gear 5 is installed, on described gear 5, be provided with the register pin 6 temporary fixed with described disk 3, the staggered transparent ruler 8 that is provided with in the bottom of described disk 3 is provided with the tooth bar 9 that is meshed with described gear 5 at the upper surface of described transparent ruler 8; Disk 3 with fixed arbitrary diameter during use is installed in the chute of montant 2 by installation shaft 4, and by the register pin 6 on the gear 5 with gear 5 and disk 3 relative fixed, then the zero graduation line on the disk 3 is alignd with the zero graduation line of described transparent ruler 8, along with the translation of transparent ruler 8 is moved, driven gear 5 rotations, just drive disk 3 rotations by gear 5, disk 3 writes down its length on transparent ruler 8 when rotating a circle, calculate its circular constant by formula again, realized easy to operate, and by the demonstration can help the student to understand and remember effect.
Description of drawings
Fig. 1 is a structural representation of the present utility model
Fig. 2 is the right view among Fig. 1
Among Fig. 1,21, support body, 2, montant, 3, disk, 4, installation shaft, 5, gear, 6, register pin, 7, clamp nut, 8, transparent ruler, 9, tooth bar.
Embodiment
According to Fig. 1, shown in 2, the utility model relates to a kind of circular constant demonstration device, it comprises support body 1, be fixed with the montant 2 of band chute on the top of described support body 1, in the chute of described montant 2, disk 3 is installed by installation shaft 4, on described installation shaft 4 and on the right side of described disk 3, gear 5 is installed, on described installation shaft 4 and an end of contiguous described gear 5 clamp nut 7 also is installed, on described gear 5, be provided with the register pin 6 temporary fixed with described disk 3, the staggered transparent ruler 8 that is provided with in the bottom of described disk 3, described disk 3 is provided with the zero graduation line, this zero graduation line aligns with the zero graduation line of described transparent ruler 8, is provided with the tooth bar 9 that is meshed with described gear 5 at the upper surface of described transparent ruler 8; Disk 3 with fixed arbitrary diameter during use is installed in the chute of montant 2 by installation shaft 4, and by the register pin 6 on the gear 5 with gear 5 and disk 3 interim relative fixed, then the zero graduation line on the disk 3 is alignd with the zero graduation line of described transparent ruler 8, along with the translation of transparent ruler 8 is moved, driven gear 5 rotations, just drive disk 3 rotations by gear 5, disk 3 writes down its length on transparent ruler 8 when rotating a circle, calculate its circular constant by formula again, realized easy to operate, and by the demonstration can help the student to understand and remember effect.
Claims (3)
1. circular constant demonstration device, it comprises support body (1), it is characterized in that: the montant (2) that is fixed with the band chute on the top of described support body (1), in the chute of described montant (2), disk (3) is installed by installation shaft (4), upward and on the right side of described disk (3) gear (5) is installed in described installation shaft (4), on described gear (5), be provided with the register pin (6) temporary fixed with described disk (3), the staggered transparent ruler (8) that is provided with in the bottom of described disk (3) is provided with the tooth bar (9) that is meshed with described gear (5) at the upper surface of described transparent ruler (8).
2. circular constant demonstration device according to claim 1 is characterized in that: the end at the last and contiguous described gear of described installation shaft (4) (5) is equipped with clamp nut (7).
3. according to the circular constant demonstration device of claim 1 or 2, it is characterized in that: described disk (3) is provided with the zero graduation line, and this zero graduation line aligns with the zero graduation line of described transparent ruler (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320117583 CN203102681U (en) | 2013-03-15 | 2013-03-15 | Circumference ratio demonstrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320117583 CN203102681U (en) | 2013-03-15 | 2013-03-15 | Circumference ratio demonstrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203102681U true CN203102681U (en) | 2013-07-31 |
Family
ID=48854067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320117583 Expired - Fee Related CN203102681U (en) | 2013-03-15 | 2013-03-15 | Circumference ratio demonstrator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203102681U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108230836A (en) * | 2018-01-22 | 2018-06-29 | 黄淮学院 | A kind of background mathematics demonstrator |
-
2013
- 2013-03-15 CN CN 201320117583 patent/CN203102681U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108230836A (en) * | 2018-01-22 | 2018-06-29 | 黄淮学院 | A kind of background mathematics demonstrator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130731 Termination date: 20140315 |