CN201816353U - Compasses used on blackboard - Google Patents
Compasses used on blackboard Download PDFInfo
- Publication number
- CN201816353U CN201816353U CN2010205192819U CN201020519281U CN201816353U CN 201816353 U CN201816353 U CN 201816353U CN 2010205192819 U CN2010205192819 U CN 2010205192819U CN 201020519281 U CN201020519281 U CN 201020519281U CN 201816353 U CN201816353 U CN 201816353U
- Authority
- CN
- China
- Prior art keywords
- compasses
- blackboard
- sucker
- circle
- supporting leg
- 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 discloses a pair of compasses used on a blackboard, which belongs to a drawing tool, and mainly solves the problem that when the traditional compasses is used to draw a circle on hard and smooth surfaces such as a blackboard, the center of the circle is easy to deflect and the radius is easy to alter. The compasses structurally comprises a compass main body consisting of a compass rotating shaft, a fixed supporting leg, a movable supporting leg, a drawing pen and a sucker, wherein the sucker is arranged at the tail end of the fixed supporting leg of the compasses; and the drawing pen is arranged at the tail end of the movable supporting leg. In the compasses, the end of the compasses with the sucker can be sucked and fixed onto the blackboard, and a chalk is used to replace the drawing pen, so that the drawing capability and level can be effectively improved, and the circle can be drawn more accurately; and as the drawing pen is replaceable, the compasses can be repeatedly used.
Description
Technical field
The utility model relates to a kind of drawing instrument, specifically a kind of blackboard compasses.
Background technology
Compasses are to be used for the instrument of picture circle and circular arc in mathematics and drawing, an end (being the center of circle) that uses compasses must guarantee to have pin in the process of drawing circle can not move and two foot distance can not change from (being radius), if but when on blackboard, using compasses, because the blackboard surface is harder and smooth, the stitch of compasses partly is difficult to fixing, move easily the position, and promptly the center of circle is difficult to determine, so can influence the accuracy and the effect of picture.
The utility model content
The purpose of this utility model is to provide a kind of blackboard compasses, and these compasses can use on smooth and hard surface and prevent the variation in its center of circle.
The technical scheme in the invention for solving the technical problem is: a kind of blackboard compasses, comprise the compasses body, it is characterized in that, constitute by compasses rotating shaft, fixed supporting leg, movable supporting legs, drawing pen and sucker, described compasses are provided with sucker in the end of fixed supporting leg, and the movable supporting legs end is provided with drawing pen.
The beneficial effects of the utility model are: simple in structure, use flexibly, conveniently, when at the blackboard upper drawing circle, one that compasses can be had sucker is absorbed and fixed on the blackboard, drawing pen uses chalk to replace, and can effectively improve graphic capability and drawing level, makes the picture circle more accurate, drawing pen is replaceable, to realize the repeated use of compasses.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Among the figure: 1 compasses rotating shaft, 2 fixed supporting legs, 3 suckers, 4 movable supporting legs, 5 drawing pens.
The specific embodiment
As shown in Figure 1.A kind of blackboard compasses, its structure comprises the compasses body, is made of compasses rotating shaft 1, fixed supporting leg 2, movable supporting legs 4, drawing pen 5 and sucker 3, and described compasses are that circle centre position is provided with sucker 3 at the end of fixed supporting leg 2, and movable supporting legs 4 ends are provided with drawing pen 5.During use, suitable drawing pen 5 or chalk are fixed on the movable supporting legs 4, determine the home position on the blackboard, then sucker 3 is adsorbed on assigned address, rotate compasses rotating shaft 1 this moment, the center of circle just can or not change arbitrarily because of the suction-operated of sucker 3 with blackboard.
The utility model is simple in structure, use flexibly, conveniently, when at the blackboard upper drawing circle, one that compasses can be had sucker is absorbed and fixed on the blackboard, drawing pen uses chalk to replace, and can effectively improve graphic capability and drawing level, makes the picture circle more accurate, drawing pen is replaceable, to realize the repeated use of compasses.
Claims (1)
1. blackboard compasses comprise the compasses body, it is characterized in that, are made of compasses rotating shaft, fixed supporting leg, movable supporting legs, drawing pen and sucker, and described compasses are provided with sucker in the end of fixed supporting leg, and the movable supporting legs end is provided with drawing pen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205192819U CN201816353U (en) | 2010-09-07 | 2010-09-07 | Compasses used on blackboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205192819U CN201816353U (en) | 2010-09-07 | 2010-09-07 | Compasses used on blackboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201816353U true CN201816353U (en) | 2011-05-04 |
Family
ID=43914318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205192819U Expired - Fee Related CN201816353U (en) | 2010-09-07 | 2010-09-07 | Compasses used on blackboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201816353U (en) |
-
2010
- 2010-09-07 CN CN2010205192819U patent/CN201816353U/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: 20110504 Termination date: 20110907 |