CN203004832U - Telescopic blackboard eraser - Google Patents
Telescopic blackboard eraser Download PDFInfo
- Publication number
- CN203004832U CN203004832U CN 201220679403 CN201220679403U CN203004832U CN 203004832 U CN203004832 U CN 203004832U CN 201220679403 CN201220679403 CN 201220679403 CN 201220679403 U CN201220679403 U CN 201220679403U CN 203004832 U CN203004832 U CN 203004832U
- Authority
- CN
- China
- Prior art keywords
- outer tube
- sleeve outer
- telescopic bar
- blackboard
- blackboard eraser
- 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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Abstract
A telescopic blackboard eraser comprises a blackboard eraser main body, a telescopic bar and a sleeve outer tube. The back face of the blackboard eraser main body is fixedly connected with the telescopic bar. The tail end of the telescopic bar is connected with the sleeve outer tube. Threads which are mutually matched are arranged on the telescopic bar and the sleeve outer tube. The sum of the lengths of the telescopic bar and the sleeve outer tube is larger than the length of the blackboard eraser main body. The telescopic bar is in a hollow structure, and the length of the telescopic bar is smaller than the length of the sleeve outer tube. The telescopic blackboard eraser is simple in structure and convenient to manufacture, even short people can erase dead corners of a blackboard cleanly due to the design of the telescopic bar, the telescopic bar can be completely retracted into the sleeve outer tube due to the fact that the length of the telescopic bar is smaller than the length of the sleeve outer tube, inconvenience when low positions of the blackboard are erased is reduced, the mass of the blackboard eraser can be lightened effectively due to the fact that the telescopic bar is in the hollow structure, and accordingly labor intensity when primary and secondary school students erase the blackboard is relieved.
Description
Technical field
The utility model relates to a kind of realia instrument, relates to specifically a kind of telescopic blackboard eraser.
Background technology
For a long time, blackboard is requisite realia on the classroom always, for teacher's writing and teaching data, but because the write area of blackboard is limited, blackboard just must be with the letter written with chalk wiped clean on blackboard after writing full writing, yet traditional blackboard eraser only has hand size, and the height of classroom blackboard is generally many higher than the students of the junior years, makes them make the first half wiped clean that is difficult to blackboard erasing the board, and causes the blackboard can't wiped clean.
The utility model content
Content of the present utility model is in order to solve the problems of the technologies described above, a kind of telescopic blackboard eraser to be provided, and it is simple in structure, facilitates the primary grades classmate to erase the board, made up can't wiped clean because of its highly not enough blackboard that causes deficiency.
The technical scheme that the utility model adopts is: a kind of eraser with support bar, comprise blackboard eraser main body, expansion link and sleeve outer tube, the described blackboard eraser main body back side is fixedly connected with expansion link, described expansion link end is connected with the sleeve outer tube, be provided with the screw thread that cooperatively interacts on described expansion link and sleeve outer tube, the length sum of described expansion link and sleeve outer tube is greater than the length of blackboard eraser main body.
Described expansion link is hollow-core construction.
The length of described expansion link is less than the length of sleeve outer tube.
The beneficial effects of the utility model: the utility model is simple in structure, easy to make, adopt the design of expansion link to make the lower people of height also can be with the dead angle wiped clean of blackboard, the length of expansion link can make expansion link be fully retracted in the sleeve outer tube less than the length of sleeve outer tube, inconvenience when reducing the blackboard wiping lower, expansion link adopts hollow-core construction, can effectively alleviate the quality of blackboard eraser, the labour intensity when the reduction students in middle and primary schools erase the board.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Mark in figure: 1, blackboard eraser main body, 2, expansion link, 3, the sleeve outer tube.
The specific embodiment
As shown in Figure 1, a kind of eraser with support bar, comprise blackboard eraser main body 1, expansion link 2 and sleeve outer tube 3, described blackboard eraser main body 1 back side is fixedly connected with expansion link 2, described expansion link 2 ends are connected with sleeve outer tube 3, be provided with the screw thread that cooperatively interacts on described expansion link 2 and sleeve outer tube 3, the length sum of described expansion link 2 and sleeve outer tube 3 is greater than the length of blackboard eraser main body 1.
During blackboard wiping, when the writing on the blackboard hand on blackboard gets at, can with in the complete retraction sleeve outer tube 3 of expansion link 2, in the time will wiping the blackboard writing on the blackboard of eminence, can make expansion link 2 extend out to suitable length by turnbarrel outer tube 3, hand-held sleeve outer tube 3 wipings.
The utility model is simple in structure, easy to make, adopt the design of expansion link to make the lower people of height also can be with the dead angle wiped clean of blackboard, expansion link adopts hollow-core construction, can effectively alleviate the quality of blackboard eraser, the labour intensity when the reduction students in middle and primary schools erase the board.
Claims (3)
1. eraser with support bar, comprise blackboard eraser main body (1), expansion link (2) and sleeve outer tube (3), it is characterized in that: described blackboard eraser main body (1) back side is fixedly connected with expansion link (2), described expansion link (2) end is connected with sleeve outer tube (3), be provided with the screw thread that cooperatively interacts on described expansion link (2) and sleeve outer tube (3), the length sum of described expansion link (2) and sleeve outer tube (3) is greater than the length of blackboard eraser main body (1).
2. a kind of eraser with support bar as claimed in claim 1 is characterized in that: described expansion link (2) is hollow-core construction.
3. a kind of eraser with support bar as claimed in claim 1, it is characterized in that: the length of described expansion link (2) is less than the length of sleeve outer tube (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220679403 CN203004832U (en) | 2012-12-11 | 2012-12-11 | Telescopic blackboard eraser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220679403 CN203004832U (en) | 2012-12-11 | 2012-12-11 | Telescopic blackboard eraser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203004832U true CN203004832U (en) | 2013-06-19 |
Family
ID=48596457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220679403 Expired - Fee Related CN203004832U (en) | 2012-12-11 | 2012-12-11 | Telescopic blackboard eraser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203004832U (en) |
-
2012
- 2012-12-11 CN CN 201220679403 patent/CN203004832U/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 | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130619 Termination date: 20131211 |