CN103978817B - Mechanical vacuuming blackboard eraser - Google Patents
Mechanical vacuuming blackboard eraser Download PDFInfo
- Publication number
- CN103978817B CN103978817B CN201410220713.9A CN201410220713A CN103978817B CN 103978817 B CN103978817 B CN 103978817B CN 201410220713 A CN201410220713 A CN 201410220713A CN 103978817 B CN103978817 B CN 103978817B
- Authority
- CN
- China
- Prior art keywords
- wiping
- dust
- wiping body
- sealed
- housing
- 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
- 239000000428 dust Substances 0.000 claims abstract description 107
- 230000000694 effects Effects 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 29
- 229920001971 elastomer Polymers 0.000 claims description 16
- 238000010521 absorption reaction Methods 0.000 claims description 13
- 239000000806 elastomer Substances 0.000 claims description 13
- 238000003825 pressing Methods 0.000 claims description 10
- 238000007667 floating Methods 0.000 claims description 7
- 230000000994 depressogenic effect Effects 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 244000227633 Ocotea pretiosa Species 0.000 description 1
- 235000004263 Ocotea pretiosa Nutrition 0.000 description 1
- 235000012813 breadcrumbs Nutrition 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Drawing Aids And Blackboards (AREA)
Abstract
The invention discloses a mechanical vacuuming blackboard eraser. The mechanical vacuuming blackboard eraser comprises a housing; a wiping mechanism is fixedly arranged at the front end of the housing; a dust storage cabin is formed at the rear end of the housing; the wiping mechanism comprises two wiping bodies which are arranged on the left side and the right side in a parallel mode respectively; the front end of each wiping body is connected with a front fixed seat; the rear end of each wiping body is connected with a rear fixed seat; the two wiping bodies can rotate relative to the front fixed seats and the rear fixed seats; the top of each wiping body extends out of the housing; a gap is formed between the two wiping bodies so as to ensure that the two wiping bodies can rotate independent to each other. According to the mechanical vacuuming blackboard eraser, the classroom environment can be purified, the health of teachers and students can be protected, the cleaning effect is good in comparison with the traditional blackboard eraser, dust emissions are not caused, and the environment-friendly and energy-saving effect is good in comparison with an electric blackboard eraser.
Description
Technical field
The present invention relates to a kind of blackboard eraser, be specifically related to a kind of mechanical type dust absorption blackboard eraser.
Background technology
Now widely used blackboard eraser, general felt and the flat board of adopting is made; The outer bread crumb napped cotton fabric of some employing foams; Also have one to be the dual-purpose cleanable blackboard eraser of blank blackboard, but need to coordinate watery chalk to use.
This blackboard eraser, during use, chalk dust flies around, both contaminated environment, also can work the mischief to the health of academics and students.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of mechanical type dust absorption blackboard eraser, and it can solve the pollution problem caused because chalk dust flies upward when erasing the board.
For solving the problems of the technologies described above, the technical solution of mechanical type dust absorption blackboard eraser of the present invention is:
Comprise housing 1, the front end of housing 1 is fixedly installed Wiping mechanism 2, and the rear end of housing 1 forms ash-storing bin 4; Wiping mechanism 2 comprises two wiping bodies 21 that left and right be arranged in parallel, and the front end of wiping body 21 connects front holder 22, and the rear end of wiping body 21 connects rear holder 23; Two wiping bodies 21 can rotate relative to forward and backward holder 22,23; The top of wiping body 21 is stretched out from housing 1, is provided with gap between two wiping bodies 21, to ensure the two separate rotation; The length of wiping body 21 is less than the length of housing 1; Unilateral bearing is respectively arranged with in each wiping body 21; The unilateral bearing rotation direction of two wiping bodies 21 is contrary, and two wiping bodies 21 are inwardly rotated; The unilateral bearing of wiping body 21 is arranged in movable axis bearing 24; Wiping body 21 connects a fixed axis 30 by its movable axis bearing 24, and the two ends of fixed axis 30 are fixedly connected with forward and backward holder 22,23 respectively; Movable axis bearing 24 connects sealed support 25; The outside of two sealed supports 25 of same wiping body 21 is connected for floating seal stake body by roller rods 251, roller rods 251 is arranged with sealed roller 28; Sealed roller 28 is positioned at the outside of this wiping body 21; Sealed support 25 can rotate around fixed axis 30, drives sealed roller 28 to move up and down; The below of each wiping body 21 is respectively arranged with dust removal brush 26; Dust removal brush 26 is fixedly installed in dust removal brush rotating shaft, and dust removal brush rotating shaft connects dust removal brush 26 by elastomer; The two ends of dust removal brush rotating shaft are flexibly connected with forward and backward holder 22,23, and dust removal brush rotating shaft can be rotated relative to forward and backward holder 22,23; Elastomer can control the angle of dust removal brush 26, makes dust removal brush 26 lean against the outer surface of wiping body 21 all the time; The lower outer of each wiping body 21 is also provided with dust block board 27; Dust block board 27 is positioned at the outside of dust removal brush 26; Dust block board 27 is fixedly installed in dust block board rotating shaft, and dust block board rotating shaft connects dust block board 27 by elastomer; The two ends of dust block board rotating shaft are flexibly connected with forward and backward holder 22,23, and dust block board rotating shaft can be rotated relative to forward and backward holder 22,23; Dust block board 27 is provided with pressing plate head 271 with the contact site of wiping body 21; Elastomer can control the angle of dust block board 27, and the pressing plate head 271 of dust block board 27 is pressed on wiping body 21 all the time.
Described rear holder 23 is provided with hinge; The inner side of back-end sealing support 25 connects rear holder 23 by back-moving spring 31, and the outside top of back-end sealing support 25 is stretched out from housing 1; Back-end sealing support 25 matches with one end of hinge pole, and the other end of hinge pole is fixedly connected with the hinge of rear holder 23; Back-end sealing support 25 can control the hinge folding of rear holder 23.
Described sealed support 25 is connected for coaxial with between movable axis bearing 24; The inner side of described sealed support 25 is provided with handle 252, and the corresponding site of movable axis bearing 24 is provided with fixture block 242; When wiping body 21 forward is stressed, drive its unilateral bearing to rotate, then sealed support 25 is by the pulling force of back-moving spring 31, and movable axis bearing 24 keeps relative stationary state with sealed support 25; When wiping body 21 reverse stressed time, its unilateral bearing is motionless, movable axis bearing 24 reversely rotates an angle relative to fixed axis 30 under the effect of this opposite force, and the fixture block 242 of movable axis bearing 24 props up the handle 252 of sealed support 25, thus the sealed roller 28 of this wiping body 21 is depressed.
When erasing the board, described sealed roller 28 presses down, and back-end sealing support 25 drives hinge to open by hinge pole, and now chalk dust can fall in ash-storing bin 4; When stopping erasing the board, sealed roller 28 is not by external force, and back-moving spring 31 makes back-end sealing support 25 reset, and hinge is closed.
A sealing strip 29 is provided with between described floating seal stake body and the inwall of housing 1.
The top of described ash-storing bin 4 is provided with ash-storing bin lid 3.
Described wiping body 21 comprises a cylindrical cavernous body, and the center of cylindrical cavernous body is fixedly installed a pipe; Described unilateral bearing is set in pipe.
The outer layer covers of described sealed roller 28 has rubber.
Described pressing plate head 271 comprises one deck tweed, and the surface of tweed is provided with one deck plastic layer.
The technique effect that the present invention can reach is:
The present invention does not in use need electric energy, without the need to being equipped with any power supply, and not only energy-conserving and environment-protective, and also structure is simple, and with low cost, easy to use, be easy to apply.
The present invention while erasing chalk word by dust collection in housing, the organic efficiency of dust is high, simultaneously can stop flying upward of dust.
Blackboard eraser can obtain cleaner by the present invention, and surface does not have floating dust.
Wiping body of the present invention can be changed when may wear to a certain degree, and wiping body is with low cost.
The present invention can purify classroom environment, and protection teachers and students are healthy; Wipe totally than traditional blackboard eraser, there is no dust from flying, again than the environmental protection and energy saving of driven blackboard sassafras.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation:
Fig. 1 is the schematic diagram of mechanical type dust absorption blackboard eraser of the present invention;
Fig. 2 is decomposing schematic representation of the present invention;
Fig. 3 is the decomposing schematic representation of Wiping mechanism of the present invention;
Fig. 4 is end view of the present invention;
Fig. 5 is the partial exploded view of Wiping mechanism of the present invention;
Fig. 6 is the partial schematic diagram of Wiping mechanism of the present invention;
Fig. 7 is the schematic diagram of another local of Wiping mechanism of the present invention;
Fig. 8 is the schematic diagram of other end of the present invention.
Description of reference numerals in figure:
1 is housing, and 2 is Wiping mechanism,
3 is ash-storing bin lid, and 4 is ash-storing bin,
21 is wiping body, and 22 is front holder,
23 is rear holder, and 24 is movable axis bearing,
25 is sealed support, and 26 is dust removal brush,
27 is dust block board, and 28 is sealed roller,
242 is fixture block, and 271 is pressing plate head,
251 is roller rods, and 252 is handle,
29 is sealing strip, and 30 is fixed axis,
31 is back-moving spring.
Detailed description of the invention
As shown in Figure 1 and Figure 2, mechanical type dust absorption blackboard eraser of the present invention, comprises housing 1, and the front end of housing 1 is fixedly installed Wiping mechanism 2, and the rear end of housing 1 forms ash-storing bin 4; The top of ash-storing bin 4 is provided with ash-storing bin lid 3;
As shown in Figure 3, Figure 4, Wiping mechanism 2 comprises two cylindric wiping bodies 21 that left and right be arranged in parallel, and the front end of wiping body 21 connects front holder 22, and the rear end of wiping body 21 connects rear holder 23; Two wiping bodies 21 can rotate relative to forward and backward holder 22,23; Forward and backward holder 22,23 is fixedly connected with housing 1; The top of wiping body 21 is stretched out from housing 1, is provided with gap between two wiping bodies 21, to ensure the two separate rotation; The length of wiping body 21 is less than the length of housing 1;
Wiping body 21 comprises a cylindrical cavernous body, and the center of cylindrical cavernous body is provided with runs through through hole, runs through through hole internal fixtion and is provided with a pipe;
Be provided with unilateral bearing in the pipe of wiping body 21, the unilateral bearing rotation direction of two wiping bodies 21 is contrary, and two wiping bodies 21 are inwardly rotated; Namely left wiping body 21 can only turn clockwise under the effect of its unilateral bearing, and right wiping body 21 can only be rotated counterclockwise under the effect of its unilateral bearing;
The unilateral bearing of wiping body 21 is arranged in movable axis bearing 24, and wiping body 21 is connected and fixed axle 30 by its movable axis bearing 24, and the two ends of fixed axis 30 are fixedly connected with forward and backward holder 22,23 respectively;
Movable axis bearing 24 coaxially connects sealed support 25, and movable axis bearing 24 and sealed support 25 are embedded in forward and backward holder 22,23;
The outside of two sealed supports 25 of same wiping body 21 is connected for floating seal stake body by roller rods 251, roller rods 251 is arranged with sealed roller 28; Sealed roller 28 is positioned at the outside of wiping body 21; The outer layer covers of sealed roller 28 has soft rubber, to reduce noise;
The below of two wiping bodies 21 is respectively arranged with dust removal brush 26; Dust removal brush 26 is fixedly installed in dust removal brush rotating shaft, and dust removal brush rotating shaft connects dust removal brush 26 by elastomer; The two ends of dust removal brush rotating shaft are flexibly connected with forward and backward holder 22,23, and dust removal brush rotating shaft can be rotated relative to forward and backward holder 22,23; Elastomer can control the angle of dust removal brush 26, makes dust removal brush 26 lean against the outer surface of wiping body 21 all the time;
The lower outer of two wiping bodies 21 is also provided with dust block board 27; Dust block board 27 is positioned at the outside of dust removal brush 26; Dust block board 27 is fixedly installed in dust block board rotating shaft, and dust block board rotating shaft connects dust block board 27 by another elastomer; The two ends of dust block board rotating shaft are flexibly connected with forward and backward holder 22,23, and dust block board rotating shaft can be rotated relative to forward and backward holder 22,23; Dust block board 27 is provided with pressing plate head 271 with the contact site of wiping body 21, and pressing plate head 271 comprises one deck tweed, and the surface of tweed is provided with the smooth plastic layer of one deck; Elastomer can control the angle of dust block board 27, and the pressing plate head 271 of dust block board 27 is pressed on wiping body 21 all the time, also still can be pressed on wiping body 21 even if wearing and tearing occur wiping body 21;
Elastomer can be torsion spring, spring or extension spring;
As shown in Figure 5, the inner side of sealed support 25 is provided with handle 252, and the corresponding site of movable axis bearing 24 is provided with fixture block 242; When wiping body 21 forward stressed (as right wiping body 21 is subject to clockwise power by anticlockwise power or left wiping examination body 21) or two selects one (or the direction that namely unilateral bearing can move continuously is positive direction), its unilateral bearing is driven to rotate, sealed support 25 is by the pulling force of back-moving spring 31, then movable axis bearing 24 keeps relative stationary state with sealed support 25; When wiping body 21 reverse stressed time, its unilateral bearing is motionless, movable axis bearing 24 can reversely rotate an angle relative to fixed axis 30 under the effect of this opposite force, the fixture block 242 of movable axis bearing 24 props up the handle 252 of sealed support 25, thus the sealed roller 28 of this wiping body 21 is depressed, as shown in Figure 6;
As shown in Figure 7, Figure 8, rear holder 23 is provided with hinge; Namely back-end sealing support 25(is positioned at the sealed support 25 of wiping body 21 rear end) inner side connect rear holder 23 by back-moving spring 31, the outside of back-end sealing support 25 is stretched out from housing 1; Back-end sealing support 25 matches with one end of hinge pole, and the other end of hinge pole is fixedly connected with the hinge of rear holder 23; Back-end sealing support 25 can control the hinge folding of rear holder 23; When back-end sealing support 25 turns to certain stroke, back-end sealing support 25 contacts one end of hinge pole and is pressed down, and drives hinge to rotate an angle, thus hinge is opened;
When erasing the board, sealed roller 28 presses down, and drive hinge to open by hinge pole after back-end sealing support 25 rotates, now chalk dust can fall in ash-storing bin 4 smoothly; When stopping erasing the board, sealed roller 28 is not by external force, and back-moving spring 31 makes back-end sealing support 25 reset, and hinge is closed;
Be provided with a sealing strip 29 between the inwall of floating seal stake body and housing 1, for the sealing between the outside of the sealed support 25 when the outside of back-end sealing support 25 is produced from housing 1 and housing 1 inwall, thus dust be sealed in housing 1; Sealing strip 29 adopts soft material;
When chalk dust in ash-storing bin 4 is filled, open ash-storing bin lid 3 and poured out.。
Operation principle of the present invention is as follows:
By two wiping bodies 21 by being pressed on blackboard, housing about 1 is swung back and forth, under the effect of unilateral bearing, two wiping bodies 21 alternately make unidirectional rotary motion; Left (housing 1 moves from right to left) during wiping, letter written with chalk surface one deck dust, at the clockwise under influence Free-rolling of its unilateral bearing, is first taken away by left wiping body 21; Meanwhile, right wiping body 21 cannot rotate relative to movable axis bearing 24 by the constraint of its unilateral bearing, more remaining letter written with chalk is wiped clean; Under the effect of blackboard frictional force, right wiping body 21 and unilateral bearing and movable axis bearing 24 entirety can reversely rotate a fixed angle around fixed axis 30, meanwhile movable axis bearing 24 drives sealed support 25 to rotate to an angle around fixed axis 30, thus right side sealed roller 28 is depressed, then right side sealed roller 28 departs from blackboard panel, thus after avoiding right wiping body 21 wiped clean blackboard, sealed roller 28 pairs of blackboard panels in right side cause secondary pollution;
Dust is brought in housing 1 by left wiping body 21 in the process of rolling, and when the dust removal brush 26 of housing 1 inwall, dust removal brush 26 is cleared up left wiping body 21 outer surface, and left wiping body 21 produces after being cleaned down by dust removal brush 26 again;
Dust removal brush 26, when brushing the dust of wiping body 21 outer surface, can evoke dust and fly upward, and the dust block board 27 be now positioned at outside dust removal brush 26 first keeps off and falls major part, then is completely enclosed within housing 1 by left side sealed roller 28 by dust;
While erasing motion, while namely back-end sealing support 25 is depressed by movable axis bearing 24, back-end sealing support 25 drives hinge to open by hinge pole, makes to be brushed the dust fallen and drops in ash-storing bin 4;
To the right during wiping in like manner, right wiping body 21 is counterclockwise Free-rolling under the effect of its unilateral bearing, is first taken away (also cleaning of at the static chalk dust wiping rear surface and leave over last time) by letter written with chalk surface one deck dust simultaneously; And left wiping body 21 cannot rotate by the constraint of its unilateral bearing, so remaining chalk dust is cleaned, simultaneously ash being collected in ash-storing bin 4; Alternate cycles like this.
Claims (7)
1. a mechanical type dust absorption blackboard eraser, is characterized in that: comprise housing (1), and the front end of housing (1) is fixedly installed Wiping mechanism (2), and the rear end of housing (1) forms ash-storing bin (4);
Wiping mechanism (2) comprises two wiping bodies (21) that left and right be arranged in parallel, and the front end of wiping body (21) connects front holder (22), and the rear end of wiping body (21) connects rear holder (23); Two wiping bodies (21) can be rotated relative to forward and backward holder (22,23); The top of wiping body (21) is stretched out from housing (1), is provided with gap between two wiping bodies (21), to ensure the two separate rotation; The length of wiping body (21) is less than the length of housing (1);
Each wiping body is respectively arranged with unilateral bearing in (21); The unilateral bearing rotation direction of two wiping bodies (21) is contrary, and two wiping bodies (21) are inwardly rotated;
The unilateral bearing of wiping body (21) is arranged in movable axis bearing (24); Wiping body (21) connects a fixed axis (30) by its movable axis bearing (24), and the two ends of fixed axis (30) are fixedly connected with forward and backward holder (22,23) respectively;
Movable axis bearing (24) connects sealed support (25); The outside of two sealed supports (25) of same wiping body (21) is connected for floating seal stake body by roller rods (251), roller rods (251) is arranged with sealed roller (28); Sealed roller (28) is positioned at the outside of this wiping body (21); Sealed support (25) can rotate around fixed axis (30), drives sealed roller (28) to move up and down;
The below of each wiping body (21) is respectively arranged with dust removal brush (26); Dust removal brush (26) is fixedly installed in dust removal brush rotating shaft, and dust removal brush rotating shaft connects dust removal brush (26) by elastomer; The two ends of dust removal brush rotating shaft are flexibly connected with forward and backward holder (22,23), and dust removal brush rotating shaft can be rotated relative to forward and backward holder (22,23); Elastomer can control the angle of dust removal brush (26), makes dust removal brush (26) lean against the outer surface of wiping body (21) all the time;
The lower outer of each wiping body (21) is also provided with dust block board (27); Dust block board (27) is positioned at the outside of dust removal brush (26); Dust block board (27) is fixedly installed in dust block board rotating shaft, and dust block board rotating shaft connects dust block board (27) by elastomer; The two ends of dust block board rotating shaft are flexibly connected with forward and backward holder (22,23), and dust block board rotating shaft can be rotated relative to forward and backward holder (22,23); Dust block board (27) is provided with pressing plate head (271) with the contact site of wiping body (21); Elastomer can control the angle of dust block board (27), makes the pressing plate head (271) of dust block board (27) be pressed on wiping body (21) all the time;
Described rear holder (23) is provided with hinge; The inner side of back-end sealing support (25) connects rear holder (23) by back-moving spring (31), and the outside top of back-end sealing support (25) is stretched out from housing (1); Back-end sealing support (25) matches with one end of hinge pole, and the other end of hinge pole is fixedly connected with the hinge of rear holder (23); Back-end sealing support (25) can control the hinge folding of rear holder (23);
Be connected for coaxial between described sealed support (25) with movable axis bearing (24); The inner side of described sealed support (25) is provided with handle (252), and the corresponding site of movable axis bearing (24) is provided with fixture block (242); When wiping body (21) forward is stressed, drive its unilateral bearing to rotate, then sealed support (25) is only by the pulling force of back-moving spring (31), and movable axis bearing (24) keeps relative stationary state with sealed support (25); When wiping body (21) reverse stressed time, its unilateral bearing is motionless, movable axis bearing (24) reversely rotates an angle relative to fixed axis (30) under the effect of this opposite force, the fixture block (242) of movable axis bearing (24) props up the handle (252) of sealed support (25), thus the sealed roller of this wiping body (21) (28) is depressed;
When erasing the board, described sealed roller (28) presses down, and drive hinge to open by hinge pole after back-end sealing support (25) rotates, now chalk dust can fall in ash-storing bin (4); When stopping erasing the board, sealed roller (28) is not by external force, and back-moving spring (31) makes back-end sealing support (25) reset, and hinge is closed.
2. mechanical type dust absorption blackboard eraser according to claim 1, is characterized in that: be provided with a sealing strip (29) between the inwall of described floating seal stake body and housing (1).
3. mechanical type dust absorption blackboard eraser according to claim 1, is characterized in that: the top of described ash-storing bin (4) is provided with ash-storing bin lid (3).
4. mechanical type dust absorption blackboard eraser according to claim 1, is characterized in that: described wiping body (21) comprises a cylindrical cavernous body, and the center of cylindrical cavernous body is fixedly installed a pipe; Described unilateral bearing is set in pipe.
5. mechanical type dust absorption blackboard eraser according to claim 1, is characterized in that: the outer layer covers of described sealed roller (28) has rubber.
6. mechanical type dust absorption blackboard eraser according to claim 1, is characterized in that: described pressing plate head (271) comprises one deck tweed, and the surface of tweed is provided with one deck plastic layer.
7. mechanical type dust absorption blackboard eraser according to claim 1, is characterized in that: described unilateral bearing is one or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410220713.9A CN103978817B (en) | 2014-05-23 | 2014-05-23 | Mechanical vacuuming blackboard eraser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410220713.9A CN103978817B (en) | 2014-05-23 | 2014-05-23 | Mechanical vacuuming blackboard eraser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103978817A CN103978817A (en) | 2014-08-13 |
| CN103978817B true CN103978817B (en) | 2015-07-22 |
Family
ID=51271096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410220713.9A Expired - Fee Related CN103978817B (en) | 2014-05-23 | 2014-05-23 | Mechanical vacuuming blackboard eraser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103978817B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107415547A (en) * | 2017-08-22 | 2017-12-01 | 苏州市智水环境科研技术有限公司 | A kind of environment-friendly dust-proof eraser |
| CN108973443A (en) * | 2018-08-10 | 2018-12-11 | 张家诚 | A kind of cyclic switching formula blackboard convenient for erasing |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86200184U (en) * | 1986-01-11 | 1986-11-26 | 黄钟和 | Dust-free blackboard eraser |
| CN202782389U (en) * | 2012-09-06 | 2013-03-13 | 雷朝 | Drum type blackboard eraser |
| CN203449817U (en) * | 2013-07-06 | 2014-02-26 | 李泰伟 | Roller brush type dedusting blackboard eraser |
| CN203511087U (en) * | 2013-10-23 | 2014-04-02 | 于坤 | Cleanable blackboard eraser |
| CN203902081U (en) * | 2014-05-23 | 2014-10-29 | 窦大宾 | Mechanical dust-collecting eraser |
-
2014
- 2014-05-23 CN CN201410220713.9A patent/CN103978817B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN103978817A (en) | 2014-08-13 |
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Granted publication date: 20150722 |