CN2719601Y - Automatic chalk device - Google Patents
Automatic chalk device Download PDFInfo
- Publication number
- CN2719601Y CN2719601Y CN 200420032314 CN200420032314U CN2719601Y CN 2719601 Y CN2719601 Y CN 2719601Y CN 200420032314 CN200420032314 CN 200420032314 CN 200420032314 U CN200420032314 U CN 200420032314U CN 2719601 Y CN2719601 Y CN 2719601Y
- Authority
- CN
- China
- Prior art keywords
- chalk
- gripping sleeve
- hollow
- spring
- sleeve
- 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 an automatic chalk device, composed of an outer sleeve, a clamping sleeve and a spring. The hollow clamping sleeve is sheathed in the hollow column-shaped outer sleeve. The front end of the clamping sleeve is provided with four paw-shaped slices which are used for clamping a chalk, and the back end thereof extends out of the top wall of the outer sleeve. A support spring is arranged in the hollow clamping sleeve. A lug boss of the clamping sleeve and the inner cavity of the inner wall of the outer sleeve are sheathed with the spring. The utility model has the advantages of simple structure, easy use, etc., can prevent the chalk from breaking off in use and avoid the problem of the mucosity of chalk dust on a hand of a teacher, and the chalk can be saved.
Description
Technical field the utility model relates to a kind of teaching aid, especially a kind of automatic chalk device.
Technical background is in classroom instruction, and the teacher will use chalk to write writing on the blackboard on blackboard.Often causing hand is chalk dust everywhere, and the skin of corrosion hand impels skin aging, chapped skin occurs.Chalk frangibility in the use, short chalk can not reuse, and causes a large amount of wastes.
The summary of the invention the purpose of this utility model provides a kind of automatic chalk device.
For achieving the above object, the automatic chalk device of the utility model is to be made up of overcoat, gripping sleeve and spring, be socketed with the gripping sleeve of hollow in the column overcoat of hollow, the front end of this gripping sleeve has and is used for four pawl matrix of clamping chalk, its rear end extends to outside the roof of overcoat, in the gripping sleeve of hollow support spring is installed, in the cavity of the boss of gripping sleeve and outer casing inner wall, is socketed with spring.
After adopting said structure, press the gripping sleeve rear end, four pawl matrix of the clamping chalk of front end are opened, and to the gripping sleeve of hollow, make support spring be compressive state the chalk plug.Thereby chalk is placed within it.
The utility model has the advantages that: simple in structure, easy to use, can prevent that chalk from use fractureing and avoid teacher's hand to be stained with the problem of chalk dust; Save chalk.
Description of drawings Fig. 1 is the overall structure schematic diagram of the automatic chalk device of the utility model.
The specific embodiment such as Fig. 1 show, the automatic chalk device of the utility model is formed by moulding system overcoat 1, gripping sleeve 2 and spring 3, be socketed with the gripping sleeve 2 of hollow in the column overcoat 1 of hollow, the front end of this gripping sleeve 2 has and is used for four pawl matrix 4 of clamping chalk, its rear end extends to outside the roof of overcoat 1, in the gripping sleeve 2 of hollow support spring 5 is installed, in the cavity of the boss of gripping sleeve 2 and overcoat 1 inwall, is socketed with spring 3.Press the gripping sleeve rear end during use, four pawl matrix of the clamping chalk of front end are opened, and to the gripping sleeve of hollow, make support spring be compressive state the chalk plug.Thereby chalk is placed within it.Press the gripping sleeve rear end in the use once more, the pawl matrix is opened, and chalk reveals under the effect of support spring puts out a part.
Claims (1)
1, a kind of automatic chalk device, form by overcoat (1), gripping sleeve (2) and spring (3), it is characterized in that: the gripping sleeve (2) that is socketed with hollow in the column overcoat (1) of hollow, the front end of this gripping sleeve (2) has and is used for four pawl matrix (4) of clamping chalk, its rear end extends to outside the roof of overcoat (1), support spring (5) is installed in the gripping sleeve of hollow (2), in the cavity of the boss of gripping sleeve (2) and overcoat (1) inwall, is socketed with spring (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420032314 CN2719601Y (en) | 2004-06-28 | 2004-06-28 | Automatic chalk device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420032314 CN2719601Y (en) | 2004-06-28 | 2004-06-28 | Automatic chalk device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2719601Y true CN2719601Y (en) | 2005-08-24 |
Family
ID=35008565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420032314 Expired - Fee Related CN2719601Y (en) | 2004-06-28 | 2004-06-28 | Automatic chalk device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2719601Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101216330B (en) * | 2007-01-04 | 2010-12-15 | 上海康德莱企业发展集团有限公司 | Measured syringe core rod rapid jig and method of use thereof |
| CN103950319A (en) * | 2014-04-08 | 2014-07-30 | 华南理工大学 | Chalk holder |
| CN104157182A (en) * | 2014-07-14 | 2014-11-19 | 华南理工大学 | Infrared pointer capable of clamping chalk |
-
2004
- 2004-06-28 CN CN 200420032314 patent/CN2719601Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101216330B (en) * | 2007-01-04 | 2010-12-15 | 上海康德莱企业发展集团有限公司 | Measured syringe core rod rapid jig and method of use thereof |
| CN103950319A (en) * | 2014-04-08 | 2014-07-30 | 华南理工大学 | Chalk holder |
| CN104157182A (en) * | 2014-07-14 | 2014-11-19 | 华南理工大学 | Infrared pointer capable of clamping chalk |
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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 |