CN203580441U - Drawing tool for use on blackboard - Google Patents
Drawing tool for use on blackboard Download PDFInfo
- Publication number
- CN203580441U CN203580441U CN201320831703.XU CN201320831703U CN203580441U CN 203580441 U CN203580441 U CN 203580441U CN 201320831703 U CN201320831703 U CN 201320831703U CN 203580441 U CN203580441 U CN 203580441U
- Authority
- CN
- China
- Prior art keywords
- cursor
- expansion link
- moving cursor
- blackboard
- rotor
- 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 relates to a drawing tool for use on a blackboard, belonging to the technical field of education and teaching. According to the technical scheme, the drawing tool comprises a magnetic collet (1), a rotor (2), a circular revolving shaft (3), a rotating arm, a moving cursor (7), a chalk insertion hole (8) and a rotating handle (9), wherein the circular revolving shaft (3) is positioned in the center of the magnetic collet, and is integrated with the magnetic collet; the rotating arm is fixed to the rotor; the rotor is matched with the circular revolving shaft, and rotates around the circular revolving shaft; the moving cursor is arranged on the rotating arm, is connected with the rotating arm in a sliding way, and slides freely on a telescopic rod; the chalk insertion hole and the rotating handle are arranged on the moving cursor, and slide freely along with the moving cursor. The drawing tool has the beneficial effects of simple structure, small size, light weight and convenience in carrying. Circles or circular arcs of needed sizes can be drawn on the blackboard randomly, drawing time is saved, and the drawing accuracy is high.
Description
Technical field
The utility model relates to a kind of blackboard circle tool, can at blackboard Anywhere, draw flexibly the circle of all size, belongs to education and instruction technical field.
Background technology
Mathematics Research be space form and the quantitative relation of objective world, a lot of subjects of mathematics all relate to a large amount of figure.Therefore mathematics teacher is at school when writing on the blackboard, the degree of accuracy of mapping, and the factors such as the speed of mapping directly can affect teaching efficiency.Accurately figure can not only bring the thinking of solving a problem to people, also have a kind of enjoyment of U.S..On blackboard, make linear figure, use ruler, set square just can be made figure quickly and accurately, although instrument is ancient, easy to use.And the figure of making shaped form is as circle, background technology existing problems are: drawing tool is not to be difficult to the fixing center of circle, are exactly that radius is difficult for selecting to be difficult to fix; The efficiency of not only drawing is low, and inconvenient operation, can not guarantee the round efficiently and accurately drawing.
Utility model content
The utility model object is to provide a kind of blackboard circle tool, conveniently on blackboard, draws the circle of various sizes, solves the problem existing in background technology.
The technical solution of the utility model is:
A kind of blackboard circle tool, comprise magnet collet, rotor, center of circle rotating shaft, cursor, moving cursor, chalk jack and rotary handle, center of circle rotating shaft is positioned at magnet collet center and is integrated with magnet collet, cursor is fixed on rotor, rotor mates with center of circle rotating shaft, around center of circle rotating shaft, rotate, cursor is provided with moving cursor, moving cursor and cursor are slidably connected, moving cursor is free to slide on expansion link, moving cursor is provided with chalk jack and rotary handle, along with moving cursor is free to slide.
Described cursor consists of rule and expansion link, and rule one end is connected with rotor, and the other end is connected with expansion link, and rule inserts expansion link, and expansion link is free to slide on rule, and moving cursor is free to slide on expansion link; Between rule and expansion link, be provided with fixed knob, for fixing rule and expansion link, be fixed on the position of required scale.
Two cover rules and expansion link are arranged in parallel, and form cursor, and moving cursor is arranged on two expansion links, and two expansion links are linked together.
Moving cursor and rotary handle link together by arm pivot post.
Center of circle rotating shaft, is used to form round track, and arm pivot post is for the ease of operation.
Magnet collet of the present utility model is fixed on to the position of required picture circle on blackboard, by the size of actual requirement regulating rotary swing arm radius, the position of fixing expansion link and vernier, holds rotary handle and rotates a circle, and can obtain required circle.
The beneficial effects of the utility model are: simple in structure, volume is little, lightweight, easy to carry, can, with the circle or the circular arc that are intended to draw on blackboard required size, draw and not only save time but also accurate.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation;
In figure: magnet collet 1, rotor 2, center of circle rotating shaft 3, rule 4, fixed knob 5, expansion link 6, moving cursor 7, chalk jack 8, rotary handle 9, arm pivot post 10.
The specific embodiment
Below in conjunction with accompanying drawing, by embodiment, the utility model is described in further detail.
A kind of blackboard circle tool, comprise magnet collet 1, rotor 2, center of circle rotating shaft 3, cursor, moving cursor 7, chalk jack 8 and rotary handle 9, center of circle rotating shaft is positioned at magnet collet center and is integrated with magnet collet, cursor is fixed on rotor, rotor mates with center of circle rotating shaft, around center of circle rotating shaft, rotate, cursor is provided with moving cursor, moving cursor and cursor are slidably connected, moving cursor is free to slide on expansion link, moving cursor is provided with chalk jack and rotary handle, along with moving cursor is free to slide.
Described cursor consists of rule 4 and expansion link 6, and rule one end is connected with rotor, and the other end is connected with expansion link, and rule inserts expansion link, and expansion link is free to slide on rule, and moving cursor is free to slide on expansion link; Between rule and expansion link, be provided with fixed knob 5, for fixing rule and expansion link, be fixed on the position of required scale.
Two cover rules and expansion link are arranged in parallel, and form cursor, and moving cursor is arranged on two expansion links, and two expansion links are linked together.
Moving cursor 7 and rotary handle 9 link together by arm pivot post 10.
During use, first this blackboard is fixed on to the position of required picture circle on blackboard with the magnet collet of circle tool, then chalk is put into chalk jack, and chalk and blackboard contact position and magnet collet are positioned in same level, finally press the size of actual requirement adjusting radius, the position of fixing expansion link and vernier, holds rotary handle and rotates a circle, and can obtain required circle.Thereby realize easy and convenient accurately in the object of blackboard upper drawing circle or circular arc.
Claims (5)
1. a blackboard circle tool, it is characterized in that comprising magnet collet (1), rotor (2), center of circle rotating shaft (3), cursor, moving cursor (7), chalk jack (8) and rotary handle (9), center of circle rotating shaft is positioned at magnet collet center and is integrated with magnet collet, cursor is fixed on rotor, rotor mates with center of circle rotating shaft, around center of circle rotating shaft, rotate, cursor is provided with moving cursor, moving cursor and cursor are slidably connected, moving cursor is free to slide on expansion link, and moving cursor is provided with chalk jack and rotary handle.
2. blackboard circle tool according to claim 1, it is characterized in that described cursor consists of rule (4) and expansion link (6), rule one end is connected with rotor, the other end is connected with expansion link, rule inserts expansion link, expansion link is free to slide on rule, and moving cursor is free to slide on expansion link.
3. blackboard circle tool according to claim 2, is characterized in that being provided with fixed knob (5) between rule and expansion link, for fixing rule and expansion link, is fixed on the position of required scale.
4. blackboard circle tool according to claim 1 and 2, is characterized in that two cover rules and expansion link are arranged in parallel, and forms cursor, and moving cursor is arranged on two expansion links, and two expansion links are linked together.
5. blackboard circle tool according to claim 1 and 2, is characterized in that moving cursor (7) and rotary handle (9) link together by arm pivot post (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320831703.XU CN203580441U (en) | 2013-12-17 | 2013-12-17 | Drawing tool for use on blackboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320831703.XU CN203580441U (en) | 2013-12-17 | 2013-12-17 | Drawing tool for use on blackboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203580441U true CN203580441U (en) | 2014-05-07 |
Family
ID=50578407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320831703.XU Expired - Fee Related CN203580441U (en) | 2013-12-17 | 2013-12-17 | Drawing tool for use on blackboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203580441U (en) |
-
2013
- 2013-12-17 CN CN201320831703.XU patent/CN203580441U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140507 Termination date: 20141217 |
|
| EXPY | Termination of patent right or utility model |