CN201941339U - Chalk sleeve - Google Patents
Chalk sleeve Download PDFInfo
- Publication number
- CN201941339U CN201941339U CN201120023280XU CN201120023280U CN201941339U CN 201941339 U CN201941339 U CN 201941339U CN 201120023280X U CN201120023280X U CN 201120023280XU CN 201120023280 U CN201120023280 U CN 201120023280U CN 201941339 U CN201941339 U CN 201941339U
- Authority
- CN
- China
- Prior art keywords
- sleeve
- chalk
- positioning body
- expansion link
- ratchet knob
- 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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- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
The utility model provides a chalk sleeve, which belongs to the field of teaching aids. The chalk sleeve comprises a sleeve, wherein a positioning body is arranged in the sleeve of which the lower end is open; the outer edge of the upper part of the positioning body is provided with an external thread which is matched with an internal thread on the inner wall of the sleeve; a telescopic rod is arranged at the upper end of the positioning body in the sleeve, and is connected with the lower end of the positioning body; the upper end of the telescopic rod is hinged with the upper end of the sleeve; a rotating button is arranged above the sleeve; the lower end of the rotating button is connected with the upper end of the telescopic rod. Compared with the prior art, the chalk sleeve has the characteristics of reasonable design, simple structure, convenience in use, capability of improving the teaching efficiency, and the like.
Description
Technical field
The utility model relates to a kind of teaching aid, specifically a kind of chalk sleeve.
Background technology
Chalk is the instrument that widely uses in the daily life, generally is used for book and writes on the blackboard.Need be on blackboard when the teacher imparts knowledge to students at school a large amount of writing words all are that the hand-held chalk of teacher is write usually, point like this, palm directly contacts with chalk, makes skin directly accept the erosion of lime, and health is impacted; In addition, hand-held chalk writes and allows chalk fracture easily, and not only influence teaching has also increased the waste of chalk.This allows the teacher feel headache.
Summary of the invention
Technical assignment of the present utility model is at the deficiencies in the prior art, and a kind of a kind of chalk sleeve reasonable in design, simple in structure is provided.
The technical scheme that its technical problem that solves the utility model adopts is: comprise sleeve, be provided with positioning body in the sleeve of lower ending opening, positioning body top outer rim is provided with external screw thread and matches with the internal thread that is provided with on the sleeve lining, positioning body upper end is to be provided with expansion link in the sleeve and to be connected with its lower end, the expansion link upper end is hinged with the sleeve upper end, the sleeve top is provided with ratchet knob, and the ratchet knob lower end is connected with the expansion link upper end.
The ratchet knob external diameter matches with sleeve outer diameter.
Sleeve outer wall is provided with anti-skidding line.
Can only relatively move up and down between the every joint of expansion link and can not relatively rotate.During use, chalk is extend in the sleeve from the sleeve lower ending opening, and chalk is inserted in the positioning body.The rotation ratchet knob, ratchet knob drives expansion link and rotates, expansion link drives positioning body again and rotates, positioning body with move up under bush whorl cooperates, expansion link compresses, and chalk is screwed in the sleeve, along with the use of chalk, the reverse rotation ratchet knob causes expansion link elongated, can screw out chalk.
A kind of chalk sleeve of the present utility model compared with prior art, the beneficial effect that is produced is:
1, have characteristics such as reasonable in design, simple in structure, easy to use, function admirable, practicality, volume is little, and is easy to carry, makes things convenient for teachers ' teaching, improved classroom teaching efficiency
2, avoided finger, palm directly to contact chalk, made its skin avoid the etch of lime, for the user provides a kind of health treatment.
Description of drawings
Accompanying drawing 1 is a structural representation of the present utility model.
Among the figure, 1, ratchet knob, 2, expansion link, 3, positioning body, 4, sleeve, 5, anti-skidding line.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is done following detailed description the in detail.
As shown in drawings, a kind of chalk sleeve of the present utility model, its structure comprises sleeve 4, be provided with positioning body 3 in the sleeve 4 of lower ending opening, positioning body 3 top outer rims are provided with external screw thread and match with the internal thread that is provided with on sleeve 4 inwalls, and positioning body 3 upper ends are to be provided with expansion link 2 in the sleeve 4 and to be connected with its lower end, and expansion link 2 upper ends and sleeve 4 upper ends are hinged, sleeve 4 tops are provided with ratchet knob 1, and ratchet knob 1 lower end is connected with expansion link 2 upper ends.
Ratchet knob 1 external diameter matches with sleeve 4 external diameters.
Its processing and fabricating of a kind of chalk sleeve of the present utility model is simple and convenient, and processing and fabricating gets final product shown in the by specification accompanying drawing.
Except that the described technical characterictic of specification, be those skilled in the art's known technology.
Claims (3)
1. chalk sleeve, comprise sleeve, it is characterized in that being provided with positioning body in the sleeve of lower ending opening, positioning body top outer rim is provided with external screw thread and matches with the internal thread that is provided with on the sleeve lining, positioning body upper end is to be provided with expansion link in the sleeve and to be connected with its lower end, the expansion link upper end is hinged with the sleeve upper end, and the sleeve top is provided with ratchet knob, and the ratchet knob lower end is connected with the expansion link upper end.
2. a kind of chalk sleeve according to claim 1 is characterized in that the ratchet knob external diameter matches with sleeve outer diameter.
3. a kind of chalk sleeve according to claim 1 is characterized in that sleeve outer wall is provided with anti-skidding line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120023280XU CN201941339U (en) | 2011-01-25 | 2011-01-25 | Chalk sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120023280XU CN201941339U (en) | 2011-01-25 | 2011-01-25 | Chalk sleeve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201941339U true CN201941339U (en) | 2011-08-24 |
Family
ID=44468690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120023280XU Expired - Fee Related CN201941339U (en) | 2011-01-25 | 2011-01-25 | Chalk sleeve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201941339U (en) |
-
2011
- 2011-01-25 CN CN201120023280XU patent/CN201941339U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110824 Termination date: 20130125 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |