CN2776699Y - Semi automatic pencil compass - Google Patents
Semi automatic pencil compass Download PDFInfo
- Publication number
- CN2776699Y CN2776699Y CN 200520089255 CN200520089255U CN2776699Y CN 2776699 Y CN2776699 Y CN 2776699Y CN 200520089255 CN200520089255 CN 200520089255 CN 200520089255 U CN200520089255 U CN 200520089255U CN 2776699 Y CN2776699 Y CN 2776699Y
- Authority
- CN
- China
- Prior art keywords
- compass
- rotary shaft
- rotating shaft
- compasses
- telescopic rotary
- 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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- Drawing Aids And Blackboards (AREA)
Abstract
The utility model relates to a semi automatic compass, which belongs to the field of cultural and teaching goods and comprises a compass main foot and an auxiliary foot. The utility model is characterized in that the compass main foot is composed of a handle and a telescopic rotary shaft, wherein the handle is screwed on one end of the telescopic rotary shaft, the other end of the telescopic rotary shaft is provided with a cone of an identical fixed center of a circle and the middle end of the telescopic rotary shaft is also provided with a penetrating groove. The compass auxiliary foot is provided with a rectangular bar ruler, the side wall of which is provided with numerical value scales and one end of the bar ruler is also provided with a round sheath which is sheathed with a telescopic pen sheath. When the semi automatic compass is used for drawing, a chalk is arranged in the pen sheath. The bar ruler in the compass auxiliary foot is penetrated through the penetrating groove on the middle end of the telescopic rotary shaft of the compass main foot. The bar ruler and the telescopic rotary shaft are connected by an adjusting and fixing knob. The semi automatic compass can be used for accurately and rapidly drawing figures on a blackboard, and is convenient for making the sizes of circles accurate because the semi automatic compass is provided with scale. The utility model also has the characteristics of simple structure and convenient use.
Description
Technical field
The utility model relates to a kind of teaching aid, particularly relates to a kind of semi-automatic compasses, belongs to the school supply and stationery category, and suitable student and teacher use in teaching.
Background technology
At present, people draw the teaching aid of round usefulness, function singleness usually; can only use sometimes a class will use a plurality of separately; carry inconvenience and easily lose, and very not nimble at the blackboard upper drawing circle, be unfavorable for that the teacher makes full use of time in classroom and finishes teaching task quickly and easily.
The utility model content
The purpose of this utility model is to overcome the prior art above shortcomings, by existing picture is justified the improvement of the teaching aid structure of usefulness, provide a kind of novel semi-automatic compasses, this semi-automatic circular programming figure accurately, fast is convenient to the teacher and is finished teaching task quickly.
This semi-automatic compasses that the utility model provides, include compasses master pin and secondary pin, be characterized in that described compasses master pin is made of handle and flexible rotating shaft, wherein handle is screwed on the end of flexible rotating shaft, the other end of flexible rotating shaft is provided with the fixedly cone in the center of circle, also is provided with a through slot in the middle-end of the rotating shaft that stretches.In the secondary pin of described compasses a rectangle bar rule is arranged, the sidewall of this bar rule is provided with numerical scale, and an end of bar rule also is provided with the circle cover, is with the telescopic pen cap in the circle cover, and chalk is housed in the pen cap when being figure.Bar rule in the secondary pin of described compasses passes the through slot of the flexible rotating shaft middle-end of compasses master pin, and bar rule is connected with regulating fixing button with flexible rotating shaft.
Compared with prior art, the beneficial effects of the utility model are: it is accurately quick to draw on blackboard, self has rule and is convenient to the accurately size of circle, also has characteristics simple in structure and easy to use.
Description of drawings
Accompanying drawing is the structural representation of an embodiment providing of the utility model.
Number in the figure: 1. handle, 2. flexible rotating shaft, 3. the rectangle bar rule is 4. regulated fixing button, 5. cone, 6. circle cover, the 7. telescopic pen cap, 8. chalk.
The specific embodiment
As shown in drawings, this semi-automatic compasses that the utility model provides, include compasses master pin and secondary pin, compasses master pin is made of handle 1 and flexible rotating shaft 2, wherein handle 1 is screwed on the end of flexible rotating shaft 2, the other end of flexible rotating shaft 2 is provided with the fixedly cone 5 in the center of circle, middle-end at flexible rotating shaft 2 also is provided with a through slot, in the secondary pin of compasses a rectangle bar rule 3 is arranged, the sidewall of this bar rule 3 is provided with numerical scale, one end of bar rule 3 also is provided with circle cover 6, be with the telescopic pen cap 7 in the circle cover 6, the pen cap is equipped with chalk 8 for 7 li when being figure, and the bar rule 3 in the secondary pin of compasses passes the through slot of flexible rotating shaft 2 middle-ends of compasses master pin, and bar rule 3 is regulated fixing button 4 with flexible rotating shaft 2 usefulness and is connected.
During use, as long as press handle 1 gently, make it earlier the fixedly center of circle, rotate rectangle bar rule 3 again and draw circle, clockwise, the inverse time change rotation can, if draw the circles of different sizes, can about twitch rectangle bar rule 3 to adjust scale, fix getting final product again with adjusting fixing button 4.
Claims (1)
1. semi-automatic compasses include compasses master pin and secondary pin, it is characterized in that
Described compasses master pin is because handle and flexible rotating shaft constitute, and wherein handle is screwed on the end of flexible rotating shaft, and the other end of flexible rotating shaft is provided with the fixedly cone in the center of circle, also is provided with a through slot in the middle-end of the rotating shaft that stretches;
In the secondary pin of described compasses a rectangle bar rule is arranged, the sidewall of this bar rule is provided with numerical scale, and an end of bar rule also is provided with the circle cover, is with the telescopic pen cap in the circle cover;
Bar rule in the secondary pin of described compasses passes the through slot of the flexible rotating shaft middle-end of compasses master pin, and bar rule is connected with regulating fixing button with flexible rotating shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520089255 CN2776699Y (en) | 2005-02-05 | 2005-02-05 | Semi automatic pencil compass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520089255 CN2776699Y (en) | 2005-02-05 | 2005-02-05 | Semi automatic pencil compass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2776699Y true CN2776699Y (en) | 2006-05-03 |
Family
ID=36744084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520089255 Expired - Fee Related CN2776699Y (en) | 2005-02-05 | 2005-02-05 | Semi automatic pencil compass |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2776699Y (en) |
-
2005
- 2005-02-05 CN CN 200520089255 patent/CN2776699Y/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 | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |