CN201070930Y - Circular curve-drawing instrument for blackboard - Google Patents
Circular curve-drawing instrument for blackboard Download PDFInfo
- Publication number
- CN201070930Y CN201070930Y CNU2007200849682U CN200720084968U CN201070930Y CN 201070930 Y CN201070930 Y CN 201070930Y CN U2007200849682 U CNU2007200849682 U CN U2007200849682U CN 200720084968 U CN200720084968 U CN 200720084968U CN 201070930 Y CN201070930 Y CN 201070930Y
- Authority
- CN
- China
- Prior art keywords
- blackboard
- tape measure
- chalk
- utility
- cyclograph
- 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
Links
Landscapes
- Drawing Aids And Blackboards (AREA)
- Tape Measures (AREA)
Abstract
The utility model discloses a blackboard cyclograph which comprises a tape measure, a sucker fixed at the bottom of the tape measure and connected with the tape measure via a plane bearing, and a chalk holder fixed at the tail end of the tape measure and used to store a chalk. The utility model has the advantages of simple structure, easy use, firm fixation and no damage to the blackboard; and is particularly suitable for painting circles on the blackboard.
Description
Technical field
The utility model relates to a kind of teaching aid, specifically, is a kind of blackboard cyclograph.
Background technology
In mathematics, circle is the content that junior middle school, senior middle school all can learn.In when teaching, teacher draws circle and all is to use wooden big compasses at present, and this compasses not only can't show diameter of a circle, and the draw point on it also is difficult on the smooth blackboard fixedly compasses, excessively also can scratch blackboard surface if exert oneself when using.Therefore it is very inconvenient to use.
Summary of the invention
The purpose of this utility model is in order to overcome the deficiency of above-mentioned background, propose a kind of simple in structure, easy to use, can be on blackboard fixation and can show the blackboard cyclograph of diameter.
At above-mentioned purpose, the blackboard cyclograph that the utility model is designed comprises tape measure, and described tape measure bottom is set with a sucker, and the two links to each other by plane bearing; The end of band tape is fixedly connected with a sleeve that is nested with chalk.
Advantage of the present utility model is: round device is drawn in conduct after utilizing tape measure to be nested with chalk, draws bowlder and can show diameter of a circle; Utilize sucker as fixing instrument simultaneously, not only fixation, and can not scratch blackboard surface.
Description of drawings
Accompanying drawing is the structural representation of blackboard cyclograph.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:
The blackboard cyclograph comprises tape measure 1 as shown in drawings, and described tape measure 1 bottom is set with a sucker 2, and the two links to each other by plane bearing; The end of tape measure 1 chi band 4 is fixedly connected with a sleeve 3 that is nested with chalk 5.
Use makes chalk 5 is enclosed within the sleeve 3, at first sucker 2 is adsorbed on the circle centre position of determining on the blackboard surface; Draw back tape measure 1 then,, make and to buckle the buckle fastening of chi band 4 on the tape measure 1 when chi band 4 length pull out equal determined diameter according to the scale on the chi band 4; Tighten chi band 4 at last, chalk 5 is rotated a week by the center of the plane bearing on blackboard surface upper edge sucker 2 just circle has been finished.
Claims (1)
1. a blackboard cyclograph comprises tape measure (1), it is characterized in that: described tape measure (1) bottom is set with a sucker (2), and the two links to each other by plane bearing; The end of tape measure (1) chi band (4) is fixedly connected with a sleeve (3) that is nested with chalk (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200849682U CN201070930Y (en) | 2007-05-29 | 2007-05-29 | Circular curve-drawing instrument for blackboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200849682U CN201070930Y (en) | 2007-05-29 | 2007-05-29 | Circular curve-drawing instrument for blackboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201070930Y true CN201070930Y (en) | 2008-06-11 |
Family
ID=39549491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200849682U Expired - Fee Related CN201070930Y (en) | 2007-05-29 | 2007-05-29 | Circular curve-drawing instrument for blackboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201070930Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103317909A (en) * | 2013-05-20 | 2013-09-25 | 苏州市职业大学 | Rope compasses |
| CN104325818A (en) * | 2014-10-24 | 2015-02-04 | 孙睿豪 | Circle describing instrument for blackboard |
| CN107757197A (en) * | 2017-09-10 | 2018-03-06 | 湖北阳超机电科技有限公司 | A kind of teacher's compasses |
| CN110576696A (en) * | 2018-06-08 | 2019-12-17 | 苏州工艺美术职业技术学院 | Compasses capable of measuring distance |
| CN110654145A (en) * | 2018-06-29 | 2020-01-07 | 白天畅 | Gyro compasses |
-
2007
- 2007-05-29 CN CNU2007200849682U patent/CN201070930Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103317909A (en) * | 2013-05-20 | 2013-09-25 | 苏州市职业大学 | Rope compasses |
| CN104325818A (en) * | 2014-10-24 | 2015-02-04 | 孙睿豪 | Circle describing instrument for blackboard |
| CN107757197A (en) * | 2017-09-10 | 2018-03-06 | 湖北阳超机电科技有限公司 | A kind of teacher's compasses |
| CN110576696A (en) * | 2018-06-08 | 2019-12-17 | 苏州工艺美术职业技术学院 | Compasses capable of measuring distance |
| CN110654145A (en) * | 2018-06-29 | 2020-01-07 | 白天畅 | Gyro compasses |
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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: 20080611 |