CN86205223U - Compasses for blackboard - Google Patents
Compasses for blackboard Download PDFInfo
- Publication number
- CN86205223U CN86205223U CN 86205223 CN86205223U CN86205223U CN 86205223 U CN86205223 U CN 86205223U CN 86205223 CN86205223 CN 86205223 CN 86205223 U CN86205223 U CN 86205223U CN 86205223 U CN86205223 U CN 86205223U
- Authority
- CN
- China
- Prior art keywords
- blackboard
- compasses
- compass
- centering
- armed lever
- 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.)
- Granted
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- Hooks, Suction Cups, And Attachment By Adhesive Means (AREA)
Abstract
The utility model discloses a compass for drawing circles on a blackboard. The compass for drawing circles on a blackboard is characterized in that the front end of the centering arm rod of the compass is connected with an eraser sucking disc which is provided with a centering device by a spherical universal steering joint. The centering device can fix the center of a circle, and the eraser sucking disc can make the compass adsorb on a blackboard. The spherical universal steering joint can make the centering arm rod of the compass draw circles when the centering arm rod of the compass inclines in large angles. Using the compass for drawing circles on a blackboard, a teacher can conveniently draw a circle on the blackboard.
Description
The utility model is a kind of compasses at the blackboard upper drawing circle of the usefulness of imparting knowledge to students.
The Compasses for blackboard centering armed lever tip of using now is an iron nail, and in, the blackboard of primary school adopts Glass blackboard or metal blackboard basically.Hard and sharp iron nail stands on the glass (or metal), is not steady on one's legs, and slides easily.The teacher will be with a hand steered centering armed lever of living compasses, and the another hand is caught the rotation armed lever, carefully draws circle, and is both hard, again trouble.
The purpose of this utility model provides a kind of compasses that can draw circle on blackboard easily.
The utility model is achieved in that the rubber sucker that connects a band centring means at the centering armed lever front end of compasses with spherical everything steering knuckle.During use, hand makes it deaeration by rubber sucker, and compasses just can be adsorbed on the blackboard upper drawing circle.
Below in conjunction with accompanying drawing the utility model is described in detail.
Brief description of drawings: accompanying drawing is the Compasses for blackboard synoptic diagram.
The utility model is adorned everything joint bulb (2) at centering armed lever (1) front end of compasses, pushes down everything with gland (3) and saves bulb and be connected with spherical bowl seat (4) top by securing member, and rubber sucker (8) is entangled in the spherical bowl seat bottom.Centring means is housed in the rubber sucker.Centring means is made up of cover (5), pressure spring (6) and movable centering point (7).Centring means is embedded in the rubber sucker when rubber-moulding.
When the teacher uses, earlier centre point is aimed at the tip of centring means, again rubber sucker is pressed.At this moment spring is compressed, and feels relieved in the sharp retraction cover, and rubber sucker has been got rid of air, and compasses just have been adsorbed on the blackboard.Then, will open up into the width that needs with the rotation armed lever (9) of chalk (10) and draw circle.Paint circle, gently pull open rubber sucker, can take off compasses from blackboard with have gentle hands.The effect of spherical everything steering knuckle is still can draw circle when compasses centering armed lever is inclined to than wide-angle.
Claims (2)
1, a kind of compasses of forming by centering armed lever and rotation armed lever at the blackboard upper drawing circle, feature of the present utility model is to adorn an everything joint bulb [2] at the front end of the centering armed lever [1] of compasses, push down everything joint bulb and be connected with spherical bowl seat [4] top by securing member with gland [3], rubber sucker [8] is entangled in the spherical bowl seat bottom.
2, Compasses for blackboard as claimed in claim 1 is characterized in that being equipped with the centring means of being made up of cover (5), pressure spring (6), movable centering point (7) in rubber sucker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86205223 CN86205223U (en) | 1986-07-21 | 1986-07-21 | Compasses for blackboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86205223 CN86205223U (en) | 1986-07-21 | 1986-07-21 | Compasses for blackboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86205223U true CN86205223U (en) | 1987-05-27 |
Family
ID=4808103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86205223 Granted CN86205223U (en) | 1986-07-21 | 1986-07-21 | Compasses for blackboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86205223U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103129259A (en) * | 2011-11-24 | 2013-06-05 | 苏州列维电器设备有限公司 | Sucking disc type multipurpose compass |
| CN105730092A (en) * | 2016-01-25 | 2016-07-06 | 信阳农林学院 | Teaching bow compass with sucker |
| CN109130626A (en) * | 2018-10-26 | 2019-01-04 | 刘小亮 | A kind of teaching compass ruler |
-
1986
- 1986-07-21 CN CN 86205223 patent/CN86205223U/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103129259A (en) * | 2011-11-24 | 2013-06-05 | 苏州列维电器设备有限公司 | Sucking disc type multipurpose compass |
| CN105730092A (en) * | 2016-01-25 | 2016-07-06 | 信阳农林学院 | Teaching bow compass with sucker |
| CN109130626A (en) * | 2018-10-26 | 2019-01-04 | 刘小亮 | A kind of teaching compass ruler |
| CN111251755A (en) * | 2018-10-26 | 2020-06-09 | 刘小亮 | Teaching compass ruler and use method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |