CN2192922Y - Integral teaching aid of chalk cover and extension pointer - Google Patents
Integral teaching aid of chalk cover and extension pointer Download PDFInfo
- Publication number
- CN2192922Y CN2192922Y CN 94240202 CN94240202U CN2192922Y CN 2192922 Y CN2192922 Y CN 2192922Y CN 94240202 CN94240202 CN 94240202 CN 94240202 U CN94240202 U CN 94240202U CN 2192922 Y CN2192922 Y CN 2192922Y
- Authority
- CN
- China
- Prior art keywords
- chalk
- bar
- teaching
- sleeve
- teaching aid
- 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
Links
Landscapes
- Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
Abstract
The utility model provides a teaching appliance of which a chalk sleeve is integrated with a telescopic draw rod serving as a teaching rod, and is suitable for teachers teaching with the chalk and a blackboard. A chalk is held by a three-claw type inner sleeve for the chalk. The extension length of the chalk can be adjusted by a spring between the inner sleeve and an outer sleeve. Integrated with the telescopic draw rod which is provided with a handle and serves as the teaching rod, the utility model overcomes the defects of contamination, skin stimulation, inconvenient operation and carrying, etc. which are caused by direct contact of the chalk on the occasion of writing.
Description
The utility model relates to the attached apparatus that helps of a kind of novel teaching, is suitable for utilizing chalk, the teacher that blackboard is imparted knowledge to students.
Existing instructional mode generally is directly to contact chalk with hand to write on blackboard, so not only can do the stolen goods hand, didactic works and lecture notes etc., and the contained material of chalk has spread effect to people's skin, makes pachylosis for a long time, dry and cracked, even can produce sequelae such as allergy, dermatitis.Directly with holding when writing, usually when it also has equivalent length, be inconvenient to use and abandoned, cause waste.Carry the religion bar in addition on class also is the part nuisance at every turn, although existing pull bar religion bar comes out, the bar handle is meticulous, uses inconvenience.
The purpose of this utility model is to provide a kind of can eliminate above-mentioned shortcoming, chalk sleeve and flexible new teaching apparatus of teaching bar to be combined into one.
The utility model is finished as follows.Clamp chalk by plastic sleeve, need not directly contact chalk when the user is write, make chalk overhanging while using, extremely short up to chalk is used, till collet head does not live, to save chalk, another annex is scalable pull bar religion bar, is integral with the sleeve of clamping chalk is capable of being combined, as pen, the religion bar separates with sleeve during use, holds the thick handle of religion bar, pulling religion masthead portion, can make the religion bar be elongated to use length, make its shortening with finishing, insert in the chalk sleeve, form one.
Accompanying drawing is the longitudinal sectional drawing of the utility model one concrete structure.
With reference to accompanying drawing, scalable pull bar religion bar ［ 1 ］ is moulded notes in plastics religion bar handles ［ 2 ］, can insert from chalk inner sleeve ［ 3 ］ easily or extract out.The left end of inner sleeve ［ 3 ］ has 120 three engaging nails of being separated by, and the pawl inwall is sawtooth pattern, to guarantee to clamp chalk, presses the right-hand member of inner sleeve ［ 3 ］ with hand, makes spring ［ 5 ］ compression between itself and the outer sleeve ［ 4 ］, the extension of scalable chalk.The right-hand member of inner sleeve ［ 3 ］ is opened one 3 through holes, can release easily when remaining in the sleeve so that chalk fractures.
The utility model is simple in structure, and the processing and manufacturing cost is low, uses, and is easy to carry, can improve numerous teachers' teaching condition effectively.
Claims (3)
1, a kind of teaching aid of forming by chalk sleeve and scalable pull bar religion bar, it is characterized in that the clamping chalk in, outer sleeve is combined into one with scalable pull bar religion bar, chalk is all adjustable with the extension of teaching bar.
2, by the teaching aid of claim 1 regulation, it is characterized in that three engaging nails of an end clamping chalk of inner sleeve ［ 3 ］ are separated by 120 °, pawl inwall indention, a φ 3 through holes are opened at the other end center of inner sleeve ［ 3 ］.
3,, it is characterized in that scalable pull bar religion bar ［ 1 ］ and teach bar handle ［ 2 ］ to mould forming one by the teaching aid of claim 1 or 2 regulations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94240202 CN2192922Y (en) | 1994-04-18 | 1994-04-18 | Integral teaching aid of chalk cover and extension pointer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94240202 CN2192922Y (en) | 1994-04-18 | 1994-04-18 | Integral teaching aid of chalk cover and extension pointer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2192922Y true CN2192922Y (en) | 1995-03-22 |
Family
ID=33847237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94240202 Expired - Fee Related CN2192922Y (en) | 1994-04-18 | 1994-04-18 | Integral teaching aid of chalk cover and extension pointer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2192922Y (en) |
-
1994
- 1994-04-18 CN CN 94240202 patent/CN2192922Y/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 | ||
| 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 |