CN202911392U - Teaching-purpose compasses - Google Patents
Teaching-purpose compasses Download PDFInfo
- Publication number
- CN202911392U CN202911392U CN 201220618181 CN201220618181U CN202911392U CN 202911392 U CN202911392 U CN 202911392U CN 201220618181 CN201220618181 CN 201220618181 CN 201220618181 U CN201220618181 U CN 201220618181U CN 202911392 U CN202911392 U CN 202911392U
- Authority
- CN
- China
- Prior art keywords
- teaching
- fixed
- compasses
- expansion link
- extensible rod
- 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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Abstract
The utility model discloses a pair of teaching-purpose compasses. The pair of teaching-purpose compasses comprises an extensible rod, a supporting foot is fixed on the lower portion of one end of the extensible rod, the supporting foot is perpendicular to the extensible rod, a handle is fixed on the upper portion of the extensible rod, a chalk sleeve is fixed on the lower portion of the other end of the extensible rod, chalks are contained in the chalk sleeve, and the chalk sleeve is perpendicular to the extensible rod. The pair of teaching-purpose compasses has the advantages that the structure is simple, the supporting foot is fixed at the one end of the extensible rod, the chalk sleeve is fixed at the other end of the extensible rod, the chalks are contained in the chalk sleeve, circles with large radiuses can be drawn after the extensible rod is drawn open, and therefore the pair of teaching-purpose compasses is very convenient to use compared with an existing pair of compasses.
Description
Technical field
The utility model relates to a kind of teaching apparatus for mathematics, particularly a kind of compasses for teaching.
Background technology
At present, in the mathematical education practice, used compasses normally are comprised of two rule legs and a spill spin block, the compasses of this structure not only cost are higher, and can not draw the circle of relatively large radius, thereby use very inconveniently, can not satisfy daily teaching needs.
Summary of the invention
Problem to be solved in the utility model is: a kind of simple in structure, compasses for teaching of being convenient to draw large radius circle is provided.
In order to solve the problems of the technologies described above, compasses for teaching of the present utility model, comprise an expansion link, the below of described expansion link one end is fixed with feet, described feet and expansion link are perpendicular, and the top of described expansion link is fixed with a handles, and the below of an other end of described expansion link is fixed with a chalk sleeve, in the described chalk sleeve chalk is housed, described chalk sleeve is perpendicular to expansion link.
The beneficial effect that the utility model is obtained is: (1) is simple in structure; (2) end of expansion link is fixed with feet, and an other end is fixed with chalk sleeve, and chalk is housed in the chalk sleeve, thereby after expansion link pulled open, compares with existing compasses, can draw the circle of large radius, thereby very easy to use.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Among the figure: 1, handle, 2, expansion link, 3, chalk sleeve, 4, chalk, 5, feet.
The specific embodiment
As shown in Figure 1, compasses for teaching of the present utility model, comprise an expansion link 2, the below of described expansion link 2 one ends is fixed with feet 5, described feet 5 is perpendicular with expansion link 2, and the top of described expansion link 2 is fixed with a handles 1, and the below of an other end of described expansion link 2 is fixed with a chalk sleeve 3, in the described chalk sleeve 3 chalk 4 is housed, described chalk sleeve 3 is perpendicular to expansion link 2.
Compasses for teaching of the present utility model, simple in structure, an end of expansion link 2 is fixed with feet 5, an other end is fixed with chalk sleeve 3, and chalk 4 is housed in the chalk sleeve 3, thereby after expansion link 2 pulled open, compare with existing compasses, can draw the circle of large radius, thus very easy to use.
The utility model is not limited to above-mentioned embodiment, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or close technical scheme, all fall within the protection domain of the present utility model.
Claims (1)
1. compasses for teaching, comprise an expansion link (2), the below of described expansion link (2) one ends is fixed with feet (5), described feet (5) is perpendicular with expansion link (2), the top of described expansion link (2) is fixed with a handles (1), the below of an other end of described expansion link (2) is fixed with a chalk sleeve (3), chalk (4) is housed in the described chalk sleeve (3), and described chalk sleeve (3) is perpendicular to expansion link (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220618181 CN202911392U (en) | 2012-11-13 | 2012-11-13 | Teaching-purpose compasses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220618181 CN202911392U (en) | 2012-11-13 | 2012-11-13 | Teaching-purpose compasses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202911392U true CN202911392U (en) | 2013-05-01 |
Family
ID=48159730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220618181 Expired - Fee Related CN202911392U (en) | 2012-11-13 | 2012-11-13 | Teaching-purpose compasses |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202911392U (en) |
-
2012
- 2012-11-13 CN CN 201220618181 patent/CN202911392U/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 | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130501 Termination date: 20131113 |