CN103434315B - Dust-proof blackboard eraser and application method thereof - Google Patents
Dust-proof blackboard eraser and application method thereof Download PDFInfo
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- CN103434315B CN103434315B CN201310294753.3A CN201310294753A CN103434315B CN 103434315 B CN103434315 B CN 103434315B CN 201310294753 A CN201310294753 A CN 201310294753A CN 103434315 B CN103434315 B CN 103434315B
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Abstract
The invention relates to a dust-proof blackboard eraser and an application method thereof, and the dust-proof blackboard eraser is designed for solving the technical problems that existing similar products are poorer in dust-proof effect and difficult in chalk dust storage. The dust-proof blackboard eraser comprises an eraser body and a base, wherein the eraser body is arranged in a groove in the middle of the base, and a chamber for storing chalk dust is formed between the eraser body and the inner wall of the base. The dust-proof blackboard eraser is characterized in that the periphery of a groove port at the lateral wall end of the groove of the base is provided with a flexible sheet; an eraser body side is higher than the port side of the flexible sheet; when the base is pressed, the position of the eraser body side is changed, the flexible sheet and the eraser body side touch a blackboard at the same time, the eraser body side and the port side of the flexible sheet are same in height, a gap is formed between the eraser body and the port of the flexible sheet, an accommodating chamber is opened, and the chalk dust enters into the accommodating chamber from the gap between the eraser body and the flexible sheet; the eraser body, the inner wall of the base and the flexible sheet form the accommodating chamber for stopping and storing the chalk dust together; meanwhile, a magnetic piece is arranged on the base or in the eraser body. The dust-proof blackboard eraser is reasonable in structural design, convenient in use, labor-saving and good in dust-proof effect.
Description
Technical field
The present invention relates to school supply and stationery, specifically refer to a kind of dust-proof blackboard eraser and using method thereof.
Background technology
Blackboard, chalk and blackboard eraser are requisite school supply and stationery in education activities.Wherein, blackboard refer to a kind of can the plane of repeated writing, plate face is hard, has black, the color such as blackish green, white; Meanwhile, present blackboard is formed through disposable compacting by high polymer alloy particle and epoxy resin mostly, can attract mutually with magnetisable material.Teacher writes with chalk and educates student on blackboard.But during with ordinary blackboard eraser wiping chalk word, the phenomenon that chalk powder can be caused to exist everywhere, affects quality of instruction, contaminated environment, harm teachers and students are healthy.
In order to the phenomenon that chalk dust when overcoming blackboard wiping flies upward everywhere, people also have developed some blackboard erasers dust-proof and easy to use.As the Authorization Notice No. CN201712367U that Chinese patent literature is published, authorized announcement date 2011.01.19, utility model name is called " Multifunctional magnetic blackboard "; And the Authorization Notice No. CN101758713A that Chinese patent literature is published, Shen Qing Publication day 2010.06.30, denomination of invention be " dust-proof blackboard eraser ", but all can not get popularization because of expensive or DeGrain.Meanwhile, ordinary blackboard eraser is all comparatively required great effort when blackboard wiping, and weak effect, speed are slow.These problems are not also resolved so far.
Summary of the invention
For overcoming above-mentioned deficiency, technical problem to be solved by this invention provides a kind of dust-proof blackboard eraser and the using method thereof that facilitate wiping for the present situation of prior art.Its objective is and to be achieved through the following technical solutions.
A kind of dust-proof blackboard eraser, this blackboard eraser comprises rub body and pedestal, and the middle part of described pedestal has groove, and rub body is arranged in this groove, forms the chamber storing chalk dust between the inwall of described rub body and described pedestal; It is characterized in that the recess sidewall notch periphery of described pedestal is provided with flexible sheets; Rub body face is higher than the port surface of flexible sheets, during pressing pedestal, the position in rub body face changes, blackboard is touched in flexible sheets and rub body face simultaneously, the port surface of rub body face and flexible sheets is with high, form gap between rub body and flexible sheets, accommodating cavity opens wide, and chalk dust enters in accommodating cavity by the gap between rub body and flexible sheets; The inwall of described rub body, pedestal, flexible sheets are jointly formed for backstop and store the accommodating cavity of chalk dust.Namely this blackboard eraser is by when being pressed in wiping on blackboard, and chalk dust enters in accommodating cavity by the gap between rub body and flexible sheets; When unclamping this blackboard eraser, position, rub body face is restored, and rub body face is higher than the port surface of flexible sheets, and accommodating cavity closes, and rub body is touched mutually with flexible sheets, and chalk dust is stored in accommodating cavity.
According to said structure feature, also the magnetic part for being adsorbed on by described blackboard eraser on blackboard can be also provided with on described pedestal or in described rub body, when magnetic part and blackboard adhesive, the position in rub body face changes, blackboard is touched in flexible sheets and rub body face simultaneously, and the port surface of rub body face and flexible sheets, with high, forms gap between rub body and flexible sheets, accommodating cavity opens wide, and chalk dust enters in accommodating cavity by the gap between rub body and flexible sheets; The inwall of described rub body, pedestal, flexible sheets are jointly formed for backstop and store the accommodating cavity of chalk dust.The i.e. magnetic part of this blackboard eraser and blackboard adhesive, this blackboard eraser is on blackboard during wiping, and chalk dust enters in accommodating cavity by the gap between rub body and flexible sheets; When magnetic part separates with blackboard, rub body ejects the port surface of flexible sheets, the space closure formed between rub body and flexible sheets, and rub body is touched mutually with flexible sheets, and accommodating cavity closes, and chalk dust is stored in accommodating cavity.
Described rub body is arranged on the middle part of described pedestal, and described accommodating cavity is looped around around described rub body.Above-mentioned rub body is arranged at the structure of base central, and the chalk dust that wiping got off to make this blackboard eraser is stored in accommodating cavity by backstop relatively easily.
Elastomer is provided with between described rub body face and the groove of pedestal.Described elastomer adopts spring or described rub body to adopt the elastomeric elements such as sponge, and when blackboard eraser is when stressed, the position in rub body face changes, thus rub body face is become with it with high from the original port surface than flexible sheets is high.Be provided with catch at the side of rub body, use for a long time to prevent rub body and cause deformation.
Between described rub body and flexible sheets, the rub body mask of gap location is gradient.Thus when rub body and flexible sheets are at blackboard wiping, when producing gap between described rub body and flexible sheets, are convenient to chalk dust and enter in pedestal; Or flexible sheets in its natural state, the shape that flexible sheets exceeds the rub body part of described groove ends actinal surface is similar terrace with edge.
Described flexible sheets is windshield wiper blade formula rubber catch.The windshield wiper blade formula design of flexible sheets, improves dust removing effects and facilitates wiping; In order to make this flexible sheets backstop chalk dust better, chalk dust is entered and moltenly puts in chamber, the designing requirement flexible sheets of flexible sheets has rational flexibility or shape, and the ora terminalis place of flexible sheets is comparatively thin.Meanwhile, the material selection of flexible sheets requires that the elasticity of flexible sheets and hardness can reach corresponding requirement.And flexible sheets is designed to the shape of windshield wiper blade, be also convenient to by chalk dust backstop in accommodating cavity, and easily chalk dust be stored in accommodating cavity.Shape for flexible sheets also can design according to the needs of actual conditions, as: flexible sheets is looped around around rub body; Meanwhile, the materials and structures shape of flexible sheets also can be selected as required.
The catch of flexible sheets is provided with in described accommodating cavity.This catch is arranged on the inwall of base recess, or designs according to the actual needs; As: this catch is arranged on rub body.When blackboard wiping, between this catch and flexible sheets, there is gap; When unclamping pedestal or pedestal takes off from blackboard, touch mutually between catch with flexible sheets.This catch stores to accommodating cavity the effect that chalk dust plays secondary guarantee.
While the above-mentioned concrete structure to flexible sheets limits further, described magnetic part is fixed on described pedestal, or between described rub body and described pedestal, or be embedded in described rub body.The vibrational power flow of said structure three kinds of magnetic parts, also can select as required, as long as can reach the dust-proof technology order with storing chalk dust of the present invention.
Described pedestal is semielliptical shape.The semielliptical shape structure of pedestal is convenient to the centre of the palm and is gripped this use blackboard eraser, also can adopt as similar semielliptical shape structures such as mouses simultaneously, and hemispherical dome structure.
The another side of described pedestal is provided with wet type rub body, and this side pedestal is provided with lid, and lid is provided with storage cap, is provided with storage chamber in lid.Said structure in conjunction with existing Wet-dry blackboard eraser, and arranges the design feature storing chalk or gel ink pen chamber in similar blackboard eraser.
According to said structure feature, namely its using method is: described rub body is adsorbed on blackboard by pressing pedestal or magnetic part, and namely when blackboard wiping, described rub body and described flexible sheets touch blackboard simultaneously, the position in rub body face changes, and the port surface of rub body face and flexible sheets is with high; Now, form gap between flexible sheets and rub body, accommodating cavity opens wide, and chalk dust enters in accommodating cavity by the gap between rub body and flexible sheets; When unclamping pedestal or pedestal takes off from blackboard, rub body ejects the port surface of flexible sheets, the space closure formed between rub body and flexible sheets, and rub body is touched mutually with flexible sheets, and accommodating cavity closes, and chalk dust is stored in accommodating cavity; Simultaneously, when taking off this blackboard eraser from blackboard, first the flexible sheets of this blackboard eraser left and right sides is pressed toward rub body place, inner side, flexible sheets on blackboard eraser is touched mutually with rub body, gap-closing between flexible sheets and rub body, accommodating cavity becomes closed from opening wide, and the chalk dust backstop of gap location is also sealed in after in accommodating cavity, then taken off from blackboard by this this blackboard eraser.In above-mentioned using method, rub body arranges magnetic part or does not arrange magnetic part and all can realize technical purpose of the present invention and technique effect, the magneticaction of magnetic part is adsorbed in except blackboard except being convenient to this blackboard eraser, for changing the height of rub body when it uses, the position in rub body face is changed, and the active force of its magnetic force is identical with the object that pressing pedestal makes the position in rub body face change.
Compared with prior art, the present invention makes blackboard eraser automatic absorbing on blackboard by arranging magnetic part, like this, do not need when blackboard wiping to apply pressure to blackboard direction again, only need promote blackboard eraser make it slide on blackboard can like a cork by letter written with chalk wiped clean, the chalk dust after wiping then by backstop in accommodating cavity.Meanwhile, the flexible sheets being similar to windshield wiper blade set on the port periphery of pedestal, can be stored in container chamber by the chalk dust backstop of erasing, can not hinder again the slip of blackboard eraser on blackboard, take into account laborsaving and dust-proof.Namely present invention efficiently solves chalk dust to disperse everywhere, contribute to teaching and carry out better, protection teachers and students' is healthy.
Accompanying drawing explanation
Fig. 1 is embodiments of the invention one using state structural representation, and in figure, A portion has done to confine, and dotted line and arrow are flexible sheets stress and deformation state and Impact direction.
Fig. 2 is the A portion structure for amplifying schematic diagram of Fig. 1.
Fig. 3 is embodiments of the invention one original state structural representation, and in figure, B portion has done to confine.
Fig. 4 is the B portion structure for amplifying schematic diagram of Fig. 3.
Fig. 5 is the improved structure schematic diagram of Fig. 1, and in figure, magnetic part is arranged in rub body.
Fig. 6 is embodiments of the invention two structural representations, and in figure, magnetic part is arranged between rub body and described pedestal.
Fig. 7 is embodiments of the invention three structural representations, and in figure, magnetic part and pedestal are connected as a single entity.
Fig. 8 is the improved structure schematic diagram of Fig. 7, and in figure, magnetic part is arranged in rub body.
Fig. 9 is improved structure schematic diagram of the present invention, and in figure, pedestal adds wet type rub body, lid, storage cap.
In figure, the name of sequence number is called: 1, pedestal, 2, rub body, 3, magnetic part, 4, flexible sheets, 11, groove.
Detailed description of the invention
Now by reference to the accompanying drawings, the invention will be further described.
Embodiment one as shown in Figure 1 to 4, this dust-proof blackboard eraser comprises:
Pedestal 1, the matrix of this blackboard eraser is hollow groove 11 in the middle part of it.
Rub body 2, the chalk trace on blackboard wiping, is arranged on the middle part of the groove of pedestal, and is fixed on the groove of pedestal; Rub body adopts the materials such as sponge kind to make, and arranges catch, use for a long time cause deformation to prevent rub body at the side of rub body.The structure of rub body and shape also can design according to actual needs, thus make chalk dust more easily by backstop and store.When this blackboard eraser is adsorbed on blackboard, during blackboard wiping, described rub body and described flexible sheets touch blackboard all simultaneously; Meanwhile, between rub body and the sidewall of pedestal, be separated with spacing, this spacing, and between flexible sheets, form the accommodating cavity for storing chalk dust.Now, the position in rub body face changes, and forms gap between rub body and flexible sheets, and chalk dust is entered in accommodating cavity by the gap between rub body and flexible sheets.
Said structure has various ways to form this gap, as: as described in the limit end in rub body face be provided with chamfering, namely have certain gradient; Or flexible sheets in its natural state, it is terrace with edge that flexible sheets exceeds the shape of the rub body part of described groove ends actinal surface similar, and this gap is convenient to chalk dust and is entered in accommodating cavity.The elastic strength realization of described flexible sheets is greater than above by the elastic strength of described rub body, and the elastic strength for making the elastic strength of described rub body be greater than described flexible sheets, be provided with spring between described rub body and base bottom, in pedestal, be provided with magnetic part.Meanwhile, for ease of the cleaning of chalk dust in the normal use of spring and accommodating cavity, between spring and rub body, also can baffle plate be set; Be provided with the catch of flexible sheets in accommodating cavity, the effect that chalk dust plays secondary guarantee is stored to accommodating cavity.During being taken off by this blackboard eraser or after taking off, because rub body is touched all the time mutually with flexible sheets, the external world that rub body seals up flexible sheets imports and exports, and the clearance seal namely between rub body and flexible sheets, chalk dust is blocked in accommodating cavity.Like this, chalk dust just can not fly upward all the time everywhere; In addition, by the suction-operated of magnetic part between this blackboard eraser and blackboard, blackboard wiping is made to become more quick, effectively.
Magnetic part 3, is arranged in the accommodating cavity between rub body external diameter and pedestal internal diameter, produces suction between itself and blackboard, can make blackboard eraser under the effect not having external force automatic absorbing on blackboard; And the writing on blackboard when mobile blackboard is wiped, can be wiped by suction between magnetic part and blackboard just.Like this, as long as the mobile blackboard eraser be adsorbed on blackboard, just more easily, rapidly letter written with chalk can be wiped.Meanwhile, as shown in Figure 5, Figure 8, magnetic part also can be embedded in described rub body; Or as shown in Figure 6, magnetic part is fixed on pedestal; And as shown in Figure 7, pedestal and magnetic part are connected as a single entity.
Flexible sheets 4, prepared by employing flexible material, can Free Transform under external force, and flexible sheets is bonded on the recess sidewall notch periphery of pedestal, also can adopt the method be embedded and pedestal one-body molded, the associated methods of flexible sheets and pedestal designs according to actual needs; And the structure of flexible sheets and shape also can design according to actual needs, by chalk dust more easily backstop storing.Flexible sheets in the present embodiment adopts wear-resisting elastomeric material preparation; When using blackboard eraser, the magneticaction due to magnetic part makes the position in rub body face change, and flexible sheets and rub body face touch blackboard simultaneously, have certain spacing between flexible sheets and rub body, and accommodating cavity opens wide.When this blackboard eraser being taken lower period or after taking off, flexible sheets is touched mutually with rub body, accommodating cavity closes, and chalk dust is blocked in accommodating cavity all the time; This blackboard eraser not used time, also can directly be adsorbed on blackboard, this blackboard eraser both can not be lost like this, also facilitated during wiping and found.
During wiping, only need promote this blackboard eraser gently and make it slide on blackboard, can by letter written with chalk wiped clean, the chalk dust after wiping can be blocked in accommodating cavity.Due to the backstop of flexible sheets and storage effect, the chalk dust kept off in accommodating cavity can not be overflowed outward accommodating cavity all the time; After using a period of time, only this blackboard eraser need be taken off from blackboard, in cleaning pedestal, the chalk dust of accommodating cavity can repeat to use again.
According to said structure and use feature, as shown in Figure 6 embodiment two, while magnetic part is fixed on pedestal, this embodiment omits the setting of spring, and the position also by rub body face changes, and the gap between rub body and flexible sheets is opened or closed.The position in above-mentioned rub body face changes by self sponge material, and after pedestal is under pressure, is passed to rub body and realizes.According to structure and the principle of above-described embodiment two, embodiment three as shown in Figure 7 is also like this; Meanwhile, as shown in Figure 8, improve the magnetic part structure of embodiment three, magnetic part also can be arranged in rub body.As shown in Figure 9, according to prior art feature, embodiment two as shown in Figure 6 also can be provided with wet type rub body in the another side of pedestal, and this side pedestal is provided with lid, and lid is provided with storage cap, is provided with storage chamber in lid.Thus be convenient to the storage in lid of chalk, neutral pen, and this blackboard eraser wipes use as wet dry Double-purpose blackboard.
Technological means of the present invention, and unrestricted technical scope of the present invention, those skilled in the art do apparent improvement in conjunction with common practise to the present invention, all fall within technical scope of the present invention.As increased the structure of the existing similar blackboard eraser such as fan or electrostatic in the structure of this blackboard eraser, improve absorption and the collecting effect of its chalk dust further.
Claims (10)
1. a dust-proof blackboard eraser, this blackboard eraser comprises rub body (2) and pedestal (1), the middle part of described pedestal has groove (11), and rub body is arranged in this groove, forms the chamber storing chalk dust between the inwall of described rub body and described pedestal; It is characterized in that groove (11) the sidewall notch periphery of described pedestal (1) is provided with flexible sheets (4); Rub body face is higher than the port surface of flexible sheets, during pressing pedestal, the position in rub body face changes, flexible sheets and rub body touch blackboard simultaneously, the port surface of rub body face and flexible sheets is with high, form gap between rub body and flexible sheets, accommodating cavity opens wide, and chalk dust enters in accommodating cavity by the gap between rub body and flexible sheets; The inwall of described rub body, pedestal, flexible sheets are jointly formed for backstop and store the accommodating cavity of chalk dust.
2. a dust-proof blackboard eraser, this blackboard eraser comprises rub body (2) and pedestal (1), the middle part of described pedestal has groove (11), and rub body is arranged in this groove, forms the chamber storing chalk dust between the inwall of described rub body and described pedestal; It is characterized in that the magnetic part (3) be also provided with on described pedestal (1) or in described rub body (2) for being adsorbed on by described blackboard eraser on blackboard, groove (11) the sidewall end notch periphery of pedestal is provided with flexible sheets (4); Rub body face is higher than the port surface of flexible sheets, when magnetic part and blackboard adhesive, the position in rub body face changes, flexible sheets and rub body touch blackboard simultaneously, the port surface of rub body face and flexible sheets is with high, form gap between rub body and flexible sheets, accommodating cavity opens wide, and chalk dust enters in accommodating cavity by the gap between rub body and flexible sheets; The inwall of described rub body, pedestal, flexible sheets are jointly formed for backstop and store the accommodating cavity of chalk dust.
3. dust-proof blackboard eraser according to claim 1 and 2, it is characterized in that described rub body (2) is arranged on the middle part of described pedestal (1), described accommodating cavity is looped around around described rub body.
4. dust-proof blackboard eraser according to claim 1 and 2, is provided with elastomer between the groove (11) that it is characterized in that described rub body (2) face and pedestal (1).
5. dust-proof blackboard eraser according to claim 1 and 2, is characterized in that the rub body mask of gap location between described rub body (2) and flexible sheets (4) is gradient.
6. dust-proof blackboard eraser according to claim 1 and 2, is characterized in that described flexible sheets (4) is for windshield wiper blade formula rubber catch, is provided with the catch of flexible sheets in described accommodating cavity.
7. dust-proof blackboard eraser according to claim 2, is characterized in that described magnetic part (3) is fixed on described pedestal (1), or between described rub body (2) and described pedestal, or be embedded in described rub body.
8. dust-proof blackboard eraser according to claim 1 and 2, is characterized in that described pedestal (1) is in semielliptical shape.
9. dust-proof blackboard eraser according to claim 1 and 2, it is characterized in that the another side of described pedestal (1) is provided with wet type rub body, this side pedestal is provided with lid, and lid is provided with and stores lid, is provided with and stores chamber in lid.
10. the using method of dust-proof blackboard eraser according to claim 1 and 2, it is characterized in that described rub body (2) is adsorbed on blackboard by pressing pedestal (1) or magnetic part (3), namely when blackboard wiping, described rub body and described flexible sheets (4) touch blackboard simultaneously, the position in rub body face changes, and the port surface of rub body face and flexible sheets is with high; Now, form gap between flexible sheets and rub body, accommodating cavity opens wide, and chalk dust enters in accommodating cavity by the gap between rub body and flexible sheets; When unclamping pedestal or pedestal takes off from blackboard, rub body ejects the port surface of flexible sheets, the space closure formed between rub body and flexible sheets, and rub body is touched mutually with flexible sheets, and accommodating cavity closes, and chalk dust is stored in accommodating cavity; Simultaneously, when taking off this blackboard eraser from blackboard, first the flexible sheets of this blackboard eraser left and right sides is pressed toward rub body place, inner side, flexible sheets on blackboard eraser is touched mutually with rub body, gap-closing between flexible sheets and rub body, accommodating cavity becomes closed from opening wide, and the chalk dust backstop of gap location is also sealed in after in accommodating cavity, then taken off from blackboard by this this blackboard eraser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310294753.3A CN103434315B (en) | 2013-07-11 | 2013-07-11 | Dust-proof blackboard eraser and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310294753.3A CN103434315B (en) | 2013-07-11 | 2013-07-11 | Dust-proof blackboard eraser and application method thereof |
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| Publication Number | Publication Date |
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| CN103434315A CN103434315A (en) | 2013-12-11 |
| CN103434315B true CN103434315B (en) | 2015-02-18 |
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| CN201310294753.3A Expired - Fee Related CN103434315B (en) | 2013-07-11 | 2013-07-11 | Dust-proof blackboard eraser and application method thereof |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103465698B (en) * | 2013-08-28 | 2015-11-18 | 陈浩 | Dust-removing blackboard eraser and using method thereof |
| CN103895427B (en) * | 2014-02-25 | 2016-06-29 | 陈浩 | Simple and easy dust-removing blackboard eraser and using method thereof |
| CN105584266A (en) * | 2014-10-24 | 2016-05-18 | 吴晨煜 | Multifunctional blackboard eraser |
| CN105946408A (en) * | 2016-06-26 | 2016-09-21 | 钱煜琴 | Improved type chalk wiper |
| CN108973459A (en) * | 2018-07-23 | 2018-12-11 | 唐佳怡 | Multifunctional blackboard for education cleaner |
| CN109017071A (en) * | 2018-08-06 | 2018-12-18 | 张欣欣 | A kind of dust-proof teaching blackboard |
| CN112590433A (en) * | 2020-12-11 | 2021-04-02 | 安徽文香信息技术有限公司 | Dust-proof blackboard eraser for intelligent classroom and control system thereof |
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| CN87205976U (en) * | 1987-04-06 | 1988-02-03 | 朴龙守 | Writing board wiper with dust collector |
| CN2105412U (en) * | 1991-09-01 | 1992-05-27 | 刘泰富 | Magnetic blackboard eraser |
| US5455976A (en) * | 1993-10-06 | 1995-10-10 | Eon S. Kim | Apparatus for automatically brushing chalk powder off from a blackboard eraser |
| CN2923373Y (en) * | 2006-05-04 | 2007-07-18 | 刘琨 | Magnetic blackboard eraser with chalk powder collection cabin |
| CN203391534U (en) * | 2013-07-11 | 2014-01-15 | 陈浩 | Dustproof blackboard eraser |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003002358A1 (en) * | 2001-06-29 | 2003-01-09 | Yulong Wang | Eraser selectively openable and closable apertures |
| KR20090114765A (en) * | 2008-04-30 | 2009-11-04 | 권태복 | Device for suction the chalk powder of blackboard eraser |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87205976U (en) * | 1987-04-06 | 1988-02-03 | 朴龙守 | Writing board wiper with dust collector |
| CN2105412U (en) * | 1991-09-01 | 1992-05-27 | 刘泰富 | Magnetic blackboard eraser |
| US5455976A (en) * | 1993-10-06 | 1995-10-10 | Eon S. Kim | Apparatus for automatically brushing chalk powder off from a blackboard eraser |
| CN2923373Y (en) * | 2006-05-04 | 2007-07-18 | 刘琨 | Magnetic blackboard eraser with chalk powder collection cabin |
| CN203391534U (en) * | 2013-07-11 | 2014-01-15 | 陈浩 | Dustproof blackboard eraser |
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Granted publication date: 20150218 Termination date: 20160711 |