CN103112294A - Blackboard eraser - Google Patents
Blackboard eraser Download PDFInfo
- Publication number
- CN103112294A CN103112294A CN 201110364821 CN201110364821A CN103112294A CN 103112294 A CN103112294 A CN 103112294A CN 201110364821 CN201110364821 CN 201110364821 CN 201110364821 A CN201110364821 A CN 201110364821A CN 103112294 A CN103112294 A CN 103112294A
- Authority
- CN
- China
- Prior art keywords
- blackboard eraser
- bristle
- hole
- housing
- brush
- 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.)
- Pending
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- Drawing Aids And Blackboards (AREA)
Abstract
The invention discloses a blackboard eraser. The blackboard eraser comprises a blackboard eraser shell, a brush is arranged in the blackboard eraser shell; a threaded through hole is formed in the center of the blackboard eraser shell; a half threaded hole is formed in the center of the upper surface of the brush; bolts which are used for controlling the brush to slide in the blackboard eraser shell are formed in the threaded through hole and the half threaded hole; balance springs are symmetrically arranged between the blackboard eraser shell and the upper surface of the brush, thereby achieving the purpose of adjusting the length of the brush, and greatly increasing using rate of the brush. The blackboard eraser has the advantages of being simple in structure, good in using effect, and capable of reducing unnecessary waste and saving outlay of schools.
Description
Technical field
The present invention relates to a kind of blackboard eraser, particularly the adjustable blackboard eraser of a kind of bristle lengths, belong to the teaching aid technical field.
Background technology
Blackboard eraser is a kind of instrument be used to wiping the chalk trace on blackboard, the teaching aid that belongs to frequent use, in frequent use procedure, the wearing and tearing of bristle are huge, usually after using a period of time, bristle will shorten, the blackboard eraser that then just more renews, and be in bristle in the blackboard eraser housing or brand-new, caused waste.
Summary of the invention
Technical problem for above-mentioned existence the objective of the invention is: proposed the adjustable blackboard eraser of a kind of bristle lengths.
Technical solution of the present invention is achieved in that a kind of blackboard eraser, comprises the blackboard eraser housing, is provided with bristle in described blackboard eraser housing; The central authorities of described blackboard eraser housing are provided with tapped through hole; The upper face center of described bristle has the half-thread hole; Be provided with bolt in described tapped through hole and half-thread hole, slide in the blackboard eraser housing in order to control bristle; Be arranged with balancing spring between the upper surface of described blackboard eraser housing and bristle.
Preferably, the cross section of described bristle is " T " font; The opening part of described blackboard eraser housing is provided with the fin that prevents that bristle from deviating from.
Preferably, as a whole between the upper surface of described balancing spring and bristle.
Preferably, the number of described balancing spring is four.
Preferably, described blackboard eraser housing is provided with handle.
Due to the utilization of technique scheme, the present invention compared with prior art has following advantages:
Blackboard eraser of the present invention is controlled bristle and is slided in the blackboard eraser housing by being provided with bolt in tapped through hole and half-thread hole, to reach the adjustable purpose of bristle lengths, makes the utilization rate of bristle greatly increase.The present invention is simple in structure, and result of use is good, reduces unnecessary waste, has saved the funds expenditure of school.
Description of drawings
Below in conjunction with accompanying drawing, technical solution of the present invention is described further:
Accompanying drawing 1 is the stereogram of blackboard eraser of the present invention;
Accompanying drawing 2 is the cutaway view of blackboard eraser of the present invention;
Wherein: 1, blackboard eraser housing; 2, bristle; 3, tapped through hole; 4, half-thread hole; 5, bolt; 6, balancing spring; 7, fin; 8, handle.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is described.
Be depicted as a kind of blackboard eraser of the present invention as accompanying drawing 1,2, comprise blackboard eraser housing 1, be provided with bristle 2 in described blackboard eraser housing 1; The central authorities of described blackboard eraser housing 1 are provided with tapped through hole 3; The upper face center of described bristle 2 has half-thread hole 4; Be provided with bolt 5 in described tapped through hole 3 and half-thread hole 4, in order to control bristle 2 in the interior slip of blackboard eraser housing 1; Be arranged with balancing spring 6 between the upper surface of described blackboard eraser housing 1 and bristle 2; The cross section of described bristle 2 is " T " font; The opening part of described blackboard eraser housing 1 is provided with the fin 7 that prevents that bristle from deviating from; As a whole between the upper surface of described balancing spring 6 and bristle 2; The number of described balancing spring 6 is four; Described blackboard eraser housing 1 is provided with handle 8.
Due to the utilization of technique scheme, the present invention compared with prior art has following advantages:
Blackboard eraser of the present invention is controlled bristle and is slided in the blackboard eraser housing by being provided with bolt in tapped through hole and half-thread hole, to reach the adjustable purpose of bristle lengths, makes the utilization rate of bristle greatly increase.The present invention is simple in structure, and result of use is good, reduces unnecessary waste, has saved the funds expenditure of school.
Above-described embodiment only is explanation technical conceive of the present invention and characteristics; its purpose is to allow person skilled in the art scholar can understand content of the present invention and be implemented; can not limit protection scope of the present invention with this; all equivalences that Spirit Essence is done according to the present invention change or modify, and all should be encompassed in protection scope of the present invention.
Claims (5)
1. a blackboard eraser, comprise the blackboard eraser housing, it is characterized in that: be provided with bristle in described blackboard eraser housing; The central authorities of described blackboard eraser housing are provided with tapped through hole; The upper face center of described bristle has the half-thread hole; Be provided with bolt in described tapped through hole and half-thread hole, slide in the blackboard eraser housing in order to control bristle; Be arranged with balancing spring between the upper surface of described blackboard eraser housing and bristle.
2. blackboard eraser according to claim 1, it is characterized in that: the cross section of described bristle is " T " font; The opening part of described blackboard eraser housing is provided with the fin that prevents that bristle from deviating from.
3. blackboard eraser according to claim 1, is characterized in that: as a whole between the upper surface of described balancing spring and bristle.
4. according to claim 1 or 3 described blackboard erasers, it is characterized in that: the number of described balancing spring is four.
5. blackboard eraser according to claim 1, it is characterized in that: described blackboard eraser housing is provided with handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110364821 CN103112294A (en) | 2011-11-17 | 2011-11-17 | Blackboard eraser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110364821 CN103112294A (en) | 2011-11-17 | 2011-11-17 | Blackboard eraser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103112294A true CN103112294A (en) | 2013-05-22 |
Family
ID=48410714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110364821 Pending CN103112294A (en) | 2011-11-17 | 2011-11-17 | Blackboard eraser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103112294A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105442172A (en) * | 2014-08-24 | 2016-03-30 | 潘阿海 | Sock making thread clamping device with shakeproof function |
-
2011
- 2011-11-17 CN CN 201110364821 patent/CN103112294A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105442172A (en) * | 2014-08-24 | 2016-03-30 | 潘阿海 | Sock making thread clamping device with shakeproof function |
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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: 20130522 |