CN201951096U - Compasses for blackboards - Google Patents
Compasses for blackboards Download PDFInfo
- Publication number
- CN201951096U CN201951096U CN2011200987941U CN201120098794U CN201951096U CN 201951096 U CN201951096 U CN 201951096U CN 2011200987941 U CN2011200987941 U CN 2011200987941U CN 201120098794 U CN201120098794 U CN 201120098794U CN 201951096 U CN201951096 U CN 201951096U
- Authority
- CN
- China
- Prior art keywords
- compasses
- blackboards
- compass foot
- blackboard
- sucker
- 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 compasses for blackboards. Upper portions of two compasses legs are hinged, a chalk sleeve is fixed to the lower end of one compasses leg, a connecting rod is fixed to the lower end of the other compasses leg, and a sucker is spherically hinged to the lower end of the connecting rod. The compasses for blackboards can be used for drawing regular circles or arcs on the glass blackboards, is simple in structure and convenient in use and saves time and labor.
Description
Technical field:
The utility model relates to a kind of blackboard compasses, is used at blackboard upper drawing circle or circular arc.
Background technology:
Compasses in the use of classroom blackboard, generally be two compass foot upper articulations, the fixing chalk sleeve in compass foot lower end wherein, another compass foot lower end is draw point fixedly, this compasses relatively are adapted at wooden blackboard upper drawing circle, and the blackboard that uses now is glass mostly, is drawing bowlder like this, and the draw point of compass foot is incessantly fixing, run easily, the round easy deformation of making, irregularity, teacher's operation is wasted time and energy.
Summary of the invention:
The purpose of this utility model provides a kind of blackboard compasses, solves the difficult problem that original compasses are not suitable for drawing at Glass blackboard circle.
The purpose of this utility model realizes as follows: two compass foot upper articulations, and the fixing chalk sleeve in compass foot lower end wherein, another compass foot lower end is extension bar fixedly, the lower end ball pivot sucker of extension bar.Draw bowlder at Glass blackboard, insert chalk in chalk sleeve, sucker is adsorbed on the blackboard, compass foot can or rotate relative to the sucker swing, and sucker the phenomenon of dislocating can not occur.
The utility model can on Glass blackboard, draw easily regular circle or circular arc, simple in structure, easy to use, time saving and energy saving.
Description of drawings:
Accompanying drawing is a structural representation of the present utility model.
The specific embodiment:
With reference to accompanying drawing, two compass foot 3 upper articulations, the fixing chalk sleeve 4 in compass foot 3 lower end wherein, another compass foot 3 lower ends are by the fixing extension bar 2 of thread forms, the lower end ball pivot sucker 1 of extension bar 2, sucker 1 can be with rubber or plastic production.
Claims (1)
1. blackboard compasses, two compass foot upper articulations, the fixing chalk sleeve in compass foot lower end wherein, it is characterized in that: another compass foot (3) lower end is extension bar (2) fixedly, the lower end ball pivot sucker (1) of extension bar (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200987941U CN201951096U (en) | 2011-03-28 | 2011-03-28 | Compasses for blackboards |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200987941U CN201951096U (en) | 2011-03-28 | 2011-03-28 | Compasses for blackboards |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201951096U true CN201951096U (en) | 2011-08-31 |
Family
ID=44495221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200987941U Expired - Fee Related CN201951096U (en) | 2011-03-28 | 2011-03-28 | Compasses for blackboards |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201951096U (en) |
-
2011
- 2011-03-28 CN CN2011200987941U patent/CN201951096U/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: 20110831 Termination date: 20120328 |