CN201941427U - Telescopic compass for teaching - Google Patents
Telescopic compass for teaching Download PDFInfo
- Publication number
- CN201941427U CN201941427U CN2011200696452U CN201120069645U CN201941427U CN 201941427 U CN201941427 U CN 201941427U CN 2011200696452 U CN2011200696452 U CN 2011200696452U CN 201120069645 U CN201120069645 U CN 201120069645U CN 201941427 U CN201941427 U CN 201941427U
- Authority
- CN
- China
- Prior art keywords
- leg
- compass
- compass leg
- compasses
- teaching
- 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 telescopic compass for teaching, which comprises a compass body, a rotating sleeve, a left compass leg and a right compass leg. The rotating sleeve is fixed to the top of the compass body, and the left compass leg and the right compass leg are capable of rotating vertically and hinged to the compass body. The left compass leg comprises a plurality of pull rods, and the right compass leg also comprises a plurality of pull rods. A positioning pin is fixed to the tail pull rod of the left compass leg, and a chalk is fixed to the tail pull rod of the right compass leg. The positioning pin is made of hard plastics. The telescopic compass has the advantages that (1) each of the left compass leg and the right compass leg comprises the pull rods so that the length of the telescopic compass is adjustable, when circles of different diameters need to be drawn, the lengths of the left compass leg and the right compass leg can be adjusted to guarantee an included angle between the left compass leg and the right compass leg to be between 30 degrees and 60 degrees, the circles can be more conveniently drawn through the compass, and (2) the positioning pin compared with an existing steel positioning pin is made of hard plastics so that a face of a blackboard cannot be damaged.
Description
Technical field
The utility model relates to a kind of mathematics class teaching aid, the flexible compasses of particularly a kind of teaching.
Background technology
Compasses are a kind of common teaching aids, existing compasses for teaching mainly comprises compasses body, left side rule leg and right compass leg, the length of left side rule leg and the length of right compass leg are changeless, when needing the bigger circle of picture diameter, angle between left side rule leg and the right compass leg is bigger, and when needing the less circle of picture diameter, the angle between left side rule leg and the right compass leg is then smaller, therefore, the inconvenience that operates very.
Summary of the invention
Problem to be solved in the utility model is: provide a kind of teaching that can change left side rule leg and right compass leg length as required flexible compasses.
In order to solve the problems of the technologies described above, the flexible compasses of teaching of the present utility model, comprise the compasses body, be fixed on the rotary sleeve of compasses body top and be hinged on the left side that can rotate up and down rule leg and right compass leg on the compasses body, described left side rule leg comprises some joint pull bars, described right compass leg also comprises some joint pull bars, be fixed with a pilot pin on the minor details pull bar of described left side rule leg, be fixed with chalk on the minor details pull bar of described right compass leg.
Teaching of the present utility model comprises three joint pull bars with flexible compasses, described left side rule leg, and described right compass leg also comprises three joint pull bars, and described pilot pin is made by rigid plastics.
The beneficial effect that the utility model is obtained is: (1) left side rule leg and right compass leg include some joint pull bars, thereby adjustable length, at the bowlder of drawing different-diameter, can be by changing the length of left side rule leg and right compass leg, guarantee that the angle between left side rule leg and the right compass leg is between the 30-60 degree, make compasses when drawing circle, be convenient to operation more; (2) described pilot pin is made by rigid plastics, compares with the pilot pin that existing iron and steel is made, and can not damage the plate face of blackboard.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Among the figure: 1, pilot pin, 2, pull bar, 3, the compasses body, 4, rotary sleeve, 5, chalk.
The specific embodiment
As shown in Figure 1, the flexible compasses of teaching of the present utility model, comprise compasses body 3, be fixed on the rotary sleeve 4 of compasses body 3 tops and be hinged on the left side that can rotate up and down rule leg and right compass leg on the compasses body 3, described left side rule leg comprises three joint pull bars 2, described right compass leg also comprises three joint pull bars 2, be fixed with a pilot pin 1 on the minor details pull bar of described left side rule leg, be fixed with chalk 5 on the minor details pull bar of described right compass leg; Described pilot pin 1 is made by rigid plastics.
The flexible compasses of teaching of the present utility model, left side rule leg and right compass leg include three joint pull bars 2, thereby adjustable length, at the bowlder of drawing different-diameter, can be by changing the length of left side rule leg and right compass leg, guarantee that the angle between left side rule leg and the right compass leg is between the 30-60 degree, make compasses when drawing circle, be convenient to operation more.
Teaching of the present utility model is compared with the pilot pin 1 that existing iron and steel is made with flexible compasses, can not damage the plate face of blackboard.
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 (2)
1. a teaching is with flexible compasses, comprise compasses body (3), be fixed on the rotary sleeve (4) of compasses body (3) top and be hinged on the left side that can rotate up and down rule leg and right compass leg on the compasses body (3), it is characterized in that: described left side rule leg comprises some joint pull bars (2), described right compass leg also comprises some joint pull bars (2), be fixed with a pilot pin (1) on the minor details pull bar of described left side rule leg, be fixed with chalk (5) on the minor details pull bar of described right compass leg.
2. the flexible compasses of teaching according to claim 1 is characterized in that: described left side rule leg comprises three joint pull bars (2), and described right compass leg comprises that also three save pull bars (2), and described pilot pin (1) is made by rigid plastics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200696452U CN201941427U (en) | 2011-03-17 | 2011-03-17 | Telescopic compass for teaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200696452U CN201941427U (en) | 2011-03-17 | 2011-03-17 | Telescopic compass for teaching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201941427U true CN201941427U (en) | 2011-08-24 |
Family
ID=44468779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200696452U Expired - Fee Related CN201941427U (en) | 2011-03-17 | 2011-03-17 | Telescopic compass for teaching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201941427U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108188477A (en) * | 2017-12-30 | 2018-06-22 | 郑州游爱网络技术有限公司 | A kind of compasses cast-cutting saw |
-
2011
- 2011-03-17 CN CN2011200696452U patent/CN201941427U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108188477A (en) * | 2017-12-30 | 2018-06-22 | 郑州游爱网络技术有限公司 | A kind of compasses cast-cutting saw |
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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: 20110824 Termination date: 20120317 |