CN102452250A - Dust-proof device for chalk - Google Patents
Dust-proof device for chalk Download PDFInfo
- Publication number
- CN102452250A CN102452250A CN2010105251101A CN201010525110A CN102452250A CN 102452250 A CN102452250 A CN 102452250A CN 2010105251101 A CN2010105251101 A CN 2010105251101A CN 201010525110 A CN201010525110 A CN 201010525110A CN 102452250 A CN102452250 A CN 102452250A
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- CN
- China
- Prior art keywords
- chalk
- movable part
- base
- moving part
- shell
- 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.)
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Abstract
The invention provides a dust-proof device for chalk, which comprises a moving part, a shell and a base, wherein the moving part is provided with a cavity, chalk is placed in the cavity of the moving part, the extending end of the bottom of the moving part is provided with external threads, the base is provided with a bulge, internal threads corresponding to the external threads are formed in the bulge, the extending end of the moving part is installed in the bulge of the base through threaded connection, and the shell is sleeved outside the moving part. In the invention, by designing the dust-proof device for chalk, a user can use the chalk without directly contacting the chalk; and a regulating mechanism is arranged in the dust-proof structure and can automatically extend or retract, so that short chalk can also be used, thereby greatly reducing the waste of the chalk.
Description
Technical field
The present invention relates to the stationery field, be specifically related to the anti-apparatus for ash of a kind of chalk.
Background technology
In teacher's teaching work, the word that often need write with chalk, chalk in use is easy to generate chip; Therefore, user's the clothes of can making dirty, the long-term use; Also can user's respiratory system be caused damage easy sphagitis, the diseases such as bronchitis of getting of user; And chalk promptly can not reuse and usually cause many unnecessary wastes with after short.
Summary of the invention
To above problem, the present invention is through the anti-apparatus for ash of a kind of chalk of design, and the user need not directly to contact with chalk to use chalk; For reaching this purpose, the present invention provides a kind of chalk to prevent apparatus for ash, comprises movable part, shell and base; Said movable part has cavity, is placed with chalk in the movable part cavity, on the external part of movable part bottom external screw thread is arranged; Said base has protuberance; Have in the protuberance and the corresponding internal thread of external screw thread, said movable part external part is installed in through being threaded in the protuberance of base, and said shell is enclosed within outside the movable part.
As further improvement of the present invention, be provided with internal thread in the said shell, said movable part is outside equipped with and the corresponding external screw thread of internal thread, for the ease of moving respective threads can be set in the enclosure, carries out transmission with convenient through screw thread.
The present invention makes that the user need not directly to contact with chalk to use chalk, and is provided with governor motion in the anti-gray structure that can stretch voluntarily, the brachycephaly chalk also can use, and has significantly reduced the waste to chalk through the anti-apparatus for ash of a kind of chalk of design.
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Description of drawings
Shown in Figure 1 is structural representation of the present invention;
Member among the figure is:
1, chalk; 2, movable part; 3, shell; 4, base;
The specific embodiment
Below in conjunction with accompanying drawing and embodiment detailed explanation is done in invention:
The present invention is through the anti-apparatus for ash of a kind of chalk of design, and the user need not directly to contact with chalk to use chalk.
The present invention provides the anti-apparatus for ash of a kind of chalk as shown in Figure 1, comprises movable part 2, shell 3 and base 4, and said movable part 2 has cavity; Be placed with chalk 1 in movable part 2 cavitys, on the movable part 2 bottom external parts external screw thread arranged, said base 4 has protuberance; Have in the protuberance and the corresponding internal thread of external screw thread, said movable part 2 external parts are installed in through being threaded in the protuberance of base 4, and said shell 3 is enclosed within outside the movable part 2; Be provided with internal thread in the said shell 3; Said movable part 2 is outside equipped with and the corresponding external screw thread of internal thread, can in shell 3, respective threads be set for the ease of moving, and carries out transmission with convenient through screw thread.
The present invention makes that the user need not directly to contact with chalk to use chalk, and is provided with governor motion in the anti-gray structure that can stretch voluntarily, the brachycephaly chalk also can use, and has significantly reduced the waste to chalk through the anti-apparatus for ash of a kind of chalk of design.
The above only is preferred embodiment of the present invention, is not to be the restriction of the present invention being made any other form, and according to any modification or equivalent variations that technical spirit of the present invention is done, still belongs to the present invention's scope required for protection.
Claims (2)
1. a chalk is prevented apparatus for ash; Comprise movable part (2), shell (3) and base (4); It is characterized in that: said movable part (2) has cavity, is placed with chalk (1) in movable part (2) cavity, on the external part of movable part (2) bottom external screw thread is arranged; Said base (4) has protuberance; Have in the protuberance and the corresponding internal thread of external screw thread, said movable part (2) external part is installed in through being threaded in the protuberance of base (4), and said shell (3) is enclosed within outside the movable part (2).
2. a kind of chalk according to claim 1 is prevented apparatus for ash, it is characterized in that: said shell is provided with internal thread in (3), and said movable part (2) is outside equipped with and the corresponding external screw thread of internal thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105251101A CN102452250A (en) | 2010-10-29 | 2010-10-29 | Dust-proof device for chalk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105251101A CN102452250A (en) | 2010-10-29 | 2010-10-29 | Dust-proof device for chalk |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102452250A true CN102452250A (en) | 2012-05-16 |
Family
ID=46036102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105251101A Pending CN102452250A (en) | 2010-10-29 | 2010-10-29 | Dust-proof device for chalk |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102452250A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105691033A (en) * | 2014-11-23 | 2016-06-22 | 史雁鸿 | Stretchable pen |
-
2010
- 2010-10-29 CN CN2010105251101A patent/CN102452250A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105691033A (en) * | 2014-11-23 | 2016-06-22 | 史雁鸿 | Stretchable pen |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120516 |