CN202200743U - Drawing type compasses - Google Patents
Drawing type compasses Download PDFInfo
- Publication number
- CN202200743U CN202200743U CN2011203219830U CN201120321983U CN202200743U CN 202200743 U CN202200743 U CN 202200743U CN 2011203219830 U CN2011203219830 U CN 2011203219830U CN 201120321983 U CN201120321983 U CN 201120321983U CN 202200743 U CN202200743 U CN 202200743U
- Authority
- CN
- China
- Prior art keywords
- leg
- circle
- type compasses
- centering
- pumping 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 provides a pair of drawing type compasses, which comprises a rotary handle, a circle drawing leg, a centering leg and a rubber ring. The pair of drawing type compasses is characterized in that the circle drawing leg is hinged with the centering leg; both the circle drawing leg and the centering leg are formed by a plurality of drawing bars; the external diameter of each drawing bar of the circle drawing leg is equal to the internal diameter of the last drawing bar; and the external diameter of each drawing bar of the centering leg is equal to the internal diameter of the last drawing bar. When the pair of drawing type compasses is used, if a small circle is drawn, the drawing bars are retracted, and if a circle with a large diameter is drawn on a blackboard, all that is needed is to pull out the drawing bars. Besides, the pair of the drawing type compasses has the advantages of simple structure and low cost, is easy to manufacture and very easy to popularize.
Description
Technical field
The utility model relates to circle tool, is specifically related to a kind of drawing and pulling type compasses.
Background technology
Compasses are a kind of picture circle common tools, and common compasses size is certain, if in teaching, on paper and at the blackboard upper drawing circle, will be equipped with the compasses that vary in size, carries inconvenience; One Chinese patent application number: 03269418.0; Name is called " drawing and pulling type multifunctional teaching compasses "; And one Chinese patent application number: 200920000058.0; Name is called " a kind of scalable angle compasses " though can change the length of picture circle leg, centering leg, bulky, complex structure through pull.
Summary of the invention
The purpose of the utility model is the deficiency to prior art, and a kind of drawing and pulling type compasses are provided.
The purpose of the utility model realizes through following technological means: a kind of drawing and pulling type compasses, include swing handle, picture circle leg, centering leg, rubber ring, and it is characterized in that: said picture circle leg, centering leg are hinged, and are several pumping rods compositions.
Said each pumping rod external diameter of picture circle leg equals the internal diameter of a joint pumping rod.
Each pumping rod external diameter of said centering leg equals the internal diameter of a joint pumping rod.
If draw roundlet during use just with the pumping rod indentation, if on blackboard, draw the bigger circle of radius, just pumping rod being pulled out can the picture circle.
The utility model is simple in structure in addition, cost is low, easy to manufacture, very easily promotes.
Although combine accompanying drawing that the preferred embodiment of the utility model is described above; But the utility model is not limited to the above-mentioned specific embodiment, and the above-mentioned specific embodiment only is schematically, is not restrictive; Those of ordinary skill in the art is under the enlightenment of the utility model; Not breaking away under the scope situation that the utility model aim and claim protect, can also make the concrete conversion of a lot of forms, these all belong within the protection domain of the utility model.
Description of drawings
Accompanying drawing is the structural representation of the utility model;
Among the figure, 1-swing handle, 2-are drawn the circle leg, the 3-lead for retractable pencil, and the 4-draw point, 5-locatees leg.
The specific embodiment
Below in conjunction with the description of drawings and the specific embodiment the utility model is done further to describe in detail:
As shown in the figure, a kind of drawing and pulling type compasses comprise swing handle 1, the round leg 2 of picture, centering leg 5, it is characterized in that: said picture circle leg 2 is hinged with the leg 5 of feeling relieved, and is several pumping rods compositions.
Said picture circle leg 2 each pumping rod external diameter equal the internal diameter of a joint pumping rod.
Said centering leg 5 each pumping rod external diameter equal the internal diameter of a joint pumping rod.
If draw roundlet during use just with the pumping rod indentation, if on blackboard, draw the bigger circle of radius, just pumping rod being pulled out can the picture circle.
Claims (3)
1. drawing and pulling type compasses comprise swing handle (1), the round leg (2) of picture, centering leg (5), and it is characterized in that: said picture circle leg (2) is hinged with the leg (5) of feeling relieved, and are several pumping rods compositions.
2. a kind of drawing and pulling type compasses according to claim 1 is characterized in that: said each pumping rod external diameter of picture circle leg (2) equals the internal diameter of a joint pumping rod.
3. a kind of drawing and pulling type compasses according to claim 1 is characterized in that: each pumping rod external diameter of said centering leg (5) equals the internal diameter of a joint pumping rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203219830U CN202200743U (en) | 2011-08-22 | 2011-08-22 | Drawing type compasses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203219830U CN202200743U (en) | 2011-08-22 | 2011-08-22 | Drawing type compasses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202200743U true CN202200743U (en) | 2012-04-25 |
Family
ID=45964879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203219830U Expired - Fee Related CN202200743U (en) | 2011-08-22 | 2011-08-22 | Drawing type compasses |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202200743U (en) |
-
2011
- 2011-08-22 CN CN2011203219830U patent/CN202200743U/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: 20120425 Termination date: 20120822 |