CN2291311Y - Repeatedly-usable blackboard - Google Patents
Repeatedly-usable blackboard Download PDFInfo
- Publication number
- CN2291311Y CN2291311Y CN 97239413 CN97239413U CN2291311Y CN 2291311 Y CN2291311 Y CN 2291311Y CN 97239413 CN97239413 CN 97239413 CN 97239413 U CN97239413 U CN 97239413U CN 2291311 Y CN2291311 Y CN 2291311Y
- Authority
- CN
- China
- Prior art keywords
- blackboard
- semi
- utility
- model
- base plate
- 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 repeatedly-usable blackboard which is suitable for teaching. A layer of sticky semi-liquid matter is coated on a base plate of the blackboard, and a layer of transparent film is covered on the sticky semi-liquid matter. Compared with other blackboards, the pollution caused by chalk dust can be thoroughly avoided because a chalk is not needed at the time of writing. The rubbing speed of the utility model is faster 3-5 times than that of other blackboards. The utility model has the advantages of simple structure, easy use and low cost.
Description
The utility model relates to a kind of blackboard.
At present the blackboard that uses is that cement plate etc. are made with the plank that scribbles black paint, and word and wipe word with blackboard eraser writes with chalk.There is such problem in this blackboard, and in use, the chalk dust that flies upward has a strong impact on speaker and scholar's the physical and mental health and the quality of giving lectures.
In order to address this problem, method commonly used is to use water to erase the board or blackboard eraser that can dust suction, but these way complex structures use inconvenience, and cost is higher.
The purpose of this utility model provides a kind of improved blackboard, avoids the chalk dust pollution problem simply and effectively.
The purpose of this utility model is achieved in that the semi-fluid substance that is coated with one deck thickness on base plate (comprise plank, cement plate etc. are used for making the material of blackboard), gently covers the film of layer of transparent, softness, flexible more in the above.The pen that writes gets final product with light small and exquisite rod shape thing.When writing on film with this pen, thick substances herein is pressed against both sides, and film quilt remaining thick substances herein sticks on the base plate, and the color of base plate sees through film and shows, thereby finishes the process of writing.Need only uncover film when erasing the board, gently overlay on then on the base plate, word has originally just disappeared, and then writes new content.Above-mentioned thick substances can use lipid material.Film can use plastic sheeting.
The utility model has fundamentally been avoided the pollution of chalk dust owing to do not use chalk and blackboard eraser.Through test, the speed that erases the board than the fast 3-5 of speed that erased the board with blackboard eraser in the past doubly.
The concrete structure of utility model is provided by following embodiment and accompanying drawing.The semi-fluid substance of the thickness that uses among the embodiment is lubricating grease.
Fig. 1 is according to the profile that prints the formula blackboard repeatedly that the utility model proposes.
Describe details and working condition in detail below in conjunction with Fig. 1 according to the blackboard that the utility model proposes.
This blackboard comprises base plate (1), grease layer (2), transparent plastic film (3), press strip (4).The effect of press strip (4) is that the film top is pressed on the base plate.
After having write word on the blackboard, open transparent plastic film (3) to its top with rod shape thing (not drawing among the figure), put down gently again along transparent plastic film (3) bottom, cover above the grease layer (2), word originally just disappears, and finishes the process of erasing the board, and can write new content again.
Claims (7)
1. blackboard, it comprises: the semi-fluid substance layer (2) of base plate (1), thickness, transparent membrane (3), it is characterized in that the semi-fluid substance layer (2) of thickness is coated on the base plate (1), transparent membrane (3) covers on the semi-fluid substance layer (2) of thickness.
2. blackboard according to claim 1 is characterized in that above-mentioned material (2) is the semi-fluid substance of thickness.
3. blackboard according to claim 1 and 2 is characterized in that the semi-fluid substance (2) of above-mentioned thickness is lipid material.
4. blackboard according to claim 1 and 2 is characterized in that the semi-fluid substance (2) of above-mentioned thickness is lubricating grease.
5. blackboard according to claim 1 is characterized in that film (3) is transparent, softness, flexible.
6. blackboard according to claim 1 or 5 is characterized in that above-mentioned transparent membrane (3) is a transparent plastic film.
7. blackboard according to claim 1 it is characterized in that the top of transparent membrane (3) is fastened on the base plate (1), and the bottom of transparent membrane can be opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97239413 CN2291311Y (en) | 1997-03-28 | 1997-03-28 | Repeatedly-usable blackboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97239413 CN2291311Y (en) | 1997-03-28 | 1997-03-28 | Repeatedly-usable blackboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2291311Y true CN2291311Y (en) | 1998-09-16 |
Family
ID=33949417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97239413 Expired - Fee Related CN2291311Y (en) | 1997-03-28 | 1997-03-28 | Repeatedly-usable blackboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2291311Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101856935A (en) * | 2010-05-19 | 2010-10-13 | 何正发 | Tablet without pen |
-
1997
- 1997-03-28 CN CN 97239413 patent/CN2291311Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101856935A (en) * | 2010-05-19 | 2010-10-13 | 何正发 | Tablet without pen |
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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 | ||
| MM1K | Cease caused by non payment of annual fee |