CN109228753A - A kind of teaching chalk writing erasing apparatus - Google Patents
A kind of teaching chalk writing erasing apparatus Download PDFInfo
- Publication number
- CN109228753A CN109228753A CN201811434685.5A CN201811434685A CN109228753A CN 109228753 A CN109228753 A CN 109228753A CN 201811434685 A CN201811434685 A CN 201811434685A CN 109228753 A CN109228753 A CN 109228753A
- Authority
- CN
- China
- Prior art keywords
- shell
- water
- hole
- sliding
- water hole
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L21/00—Blackboard or slate cleaning devices
Abstract
The invention discloses a kind of teaching chalk writing erasing apparatus, relate generally to teaching equipment field.Including first shell, water storage box is set in first shell, the first water hole is set on the bottom wall of first shell, second shell is set in first shell, the second water hole is set on second shell bottom wall, second shell sets two supporting blocks, lead screw, lead screw connects motor, screw is set on lead screw, catch bar is set on screw, catch bar one end sets control group, control group includes closed plate, through hole is set in closed plate, closed plate movement can make through hole and the first water hole, the connection of second water hole, scraper plate is set on the side wall of second shell, the protruding second shell of scraper plate energy, wiping board is set in second shell, third water hole is set on wiping board, wiping board side sets bristle.Benefit effect of the invention: can facilitate the chalk marking removed on blackboard, and can reduce dust caused by erasing chalk word, reduce environmental pollution, and improve the giving lessons of Faculty and Students, academic environment.
Description
Technical field
The present invention relates to teaching equipment field, specifically a kind of teaching chalk writing erasing apparatus.
Background technique
Although current electronic whiteboard is increasingly being applied to classroom instruction field, thoroughly more exchange device is one
Fairly time consuming laborious work, blackboard are also still the teaching aid most generally used.There is many years experience with students especially for some
Teacher for, chalk-writing writing on the blackboard almost becomes its important content given lessons.During giving lessons, teacher will be in blackboard
Upper writing writing on the blackboard many times, but traditional blackboard an inconvenience lie in that, every class terminates, or needs to write writing on the blackboard again
Before, the chalk writing on manual erasing blackboard is needed, teacher writes and more exerts oneself sometimes, and the chalk marking can stay in shape on blackboard
It at the trace of a protrusion, is directly gone to wipe more difficult removal with blackboard eraser, needs to exert oneself very much, and be easy to leave one under the influence of the marking
The clarity of secondary written contents, on the other hand, chalk dust are also easy to carry out adverse effect to the health care belt of human body, cause certain ring
Border pollution, influences the giving lessons of Faculty and Students, academic environment.
Summary of the invention
The purpose of the present invention is to provide a kind of teaching chalk writing erasing apparatus, the powder removed on blackboard can be facilitated
The marking, and dust caused by erasing chalk word can be reduced, it reduces environmental pollution, improves giving lessons, learning for Faculty and Students
Environment.
The present invention to achieve the goals above, is implemented with the following technical solutions:
A kind of teaching chalk writing erasing apparatus is equipped with the first shell of opening including side, the first shell
Bottom is equipped with water storage box, and the water storage box is equipped with water inlet, and the opening of the water storage box is towards first shell, the first shell
The bottom wall of body is equipped with several first water holes, and opening the towards the opening side of first shell is equipped in the first shell
Two shells, the bottom wall of the second shell are equipped with the second water hole matched with the first water hole, the second shell
It sets close to the side of the bottom wall of first shell there are two supporting block, lead screw is equipped between two supporting blocks, the lead screw connects
Motor is connect, the motor connects power supply, and the lead screw is equipped with the screw matched with lead screw, and the screw, which is equipped with, to be pushed
One end of bar, the separate screw of the catch bar is equipped with control group, and the control group includes closed plate, the closed plate and first
Gap between shell and second shell is adapted, and the closed plate is equipped with the through hole matched with the second water hole, institute
Stating closed plate movement can be such that through hole is connected to the first water hole, the second water hole, and the side wall of the second shell, which is equipped with, to be scraped
Plate, the protruding second shell of the scraper plate energy, the second shell is interior to be equipped with wiping board, and the wiping board, which is equipped with, crosses water with second
The side of the adaptable third water hole in hole, the separate second shell of the wiping board is equipped with bristle.
The side wall of the first shell is equipped with sliding groove, is equipped with sliding shoe in the sliding groove, the sliding shoe leans on
One end of nearly second shell connects scraper plate.
The sliding groove is T-type sliding groove, and one end of separate the scraper plate of the sliding shoe is equipped with adaptable with sliding groove
Limit plate is equipped with spring between the limit plate bottom and sliding groove.
The limit plate is equipped with the first sliding cylinder, and it is sliding that the sliding groove is equipped with second matched with the first sliding cylinder
Dynamic cylinder, second sliding cylinder are set in outside the first sliding cylinder, and first sliding cylinder can be moved along the second sliding cylinder, described
Spring is set in the first sliding cylinder, outside the second sliding cylinder.
It is equipped with telescopic rod between the second shell and wiping board, is equipped with and slides between second water hole and third water hole
Moving sleeve.
The side wall of the second shell is equipped with hair dryer, and the outlet air end of the hair dryer is towards bristle direction.
The prior art is compared, the beneficial effects of the present invention are:
By being arranged in the scraper plate of second shell, scraper plate can facilitate the chalk marking removed on blackboard, in water storage box
Moisture can be crossed water by the first water hole, the second water hole, third when needed by the control of promotion group by moisture
Hole reaches wiping board, and when wiping blackboard, moisture can reduce dust caused by erasing chalk word, reduces environmental pollution, and improves teacher
With the giving lessons of student, academic environment.
Detailed description of the invention
Attached drawing 1 is schematic structural view of the invention；
Attached drawing 2 is part A enlarged diagram of the present invention.
Numbering in the drawing: 1, first shell；2, water storage box；3, the first water hole；4, second shell；5, the second water hole；
6, supporting block；7, lead screw；8, screw；9, catch bar；10, closed plate；11, through hole；12, scraper plate；13, wiping board；14, third mistake
Water hole；15, bristle；16, sliding groove；17, sliding shoe；18, limit plate；19, spring；20, the first sliding cylinder；21, the second sliding
Cylinder；22, telescopic rod；23, sliding sleeve；24, hair dryer.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after having read the content that the present invention is told about, the technology of this field
Personnel can make various changes or modifications the present invention, and such equivalent forms are equally fallen in range defined herein.
Of the present invention is a kind of teaching chalk writing erasing apparatus, and the first shell 1 of opening, institute are equipped with including side
The bottom for stating first shell 1 is equipped with water storage box 2, can be realized by welding or bolted mode, be set on the water storage box 2
There is water inlet, towards first shell 1, the bottom wall of the first shell 1 is equipped with several first and crosses water the opening of the water storage box 2
Hole 3, the first shell 1 is interior to be equipped with the second shell 4 being open towards the opening side of first shell 1, first shell and second
There is certain gap, the bottom wall of the second shell 4 is equipped with second matched with the first water hole 3 and crosses water between shell
Hole 5, the side of the bottom wall of the close first shell 1 of the second shell 4 are set there are two supporting block 6, can pass through welding or spiral shell
It tethers and the modes such as connects and realize, lead screw 7 is equipped between two supporting blocks 6, and the lead screw 7 connects motor, the motor connection
Power supply, power supply can be battery, preferably, control switch can be set to control the start and stop of motor, the lead screw 7 is equipped with
The screw 8 matched with lead screw 7, the screw 8 are equipped with catch bar 9, push the promotion group being equipped with by catch bar, real
Now control water flow enters second shell, and one end of the separate screw 8 of the catch bar 9 is equipped with control group, and the control group includes
Closed plate 10, the gap between the closed plate 10 and first shell 1 and second shell 4 are adapted, set in the closed plate 10
There is the through hole 11 matched with the second water hole 5,10 movement of closed plate can make through hole 11 and the first water hole 3,
The connection of two water holes 5, moisture can flow through hole from the first water hole and flow to the second water hole, control when catch bar pushes
Group can close or open the first water hole in first shell, and when the first water hole is connected to the second water hole, water can be with
Second shell is flowed to from water storage box, the side wall of the second shell 4 is equipped with scraper plate 12,12 energy protruding second of scraper plate
Shell 4, is equipped with wiping board 13 in the second shell 4, scraper plate be set to the side wall of second shell and the side wall of wiping board gap it
Between, scraper plate stretches out second shell, can root out the chalk marking of blackboard upper process, and the wiping board 13 is equipped with and the second water hole
5 adaptable third water holes 14, water can flow to wiping board from second shell, preferably, can be arranged on third water hole
Spray nozzle is arranged on third water hole in water pump, and water is pressed to wiping board from second shell, is sprayed on blackboard by water pump, is convenient for dedusting,
The side of the separate second shell 4 of the wiping board 13 is equipped with bristle 15, and bristle is for wiping blackboard.
The present invention is in use, using the bristle on wiping board, wipes the letter written with chalk on blackboard, the moisture in water storage box is left to
On letter written with chalk, dust is reduced when the more protrusion of the chalk writing on blackboard and when being not easy to wipe, strikes off processing with scraper plate, then again
Blackboard is wiped using wiping board.
For the ease of controlling scraper plate, the side wall of the first shell 1 is equipped with sliding groove 16, is equipped in the sliding groove 16
One end of sliding shoe 17, the close second shell 4 of the sliding shoe 17 connects scraper plate 12, and the knife out of scraper plate is controlled convenient for user
Degree can according to need scraper plate releasing more parts, be conveniently adjusted scraping angle, reduce first shell when in use to the greatest extent
Body or second shell are touched with blackboard, improve convenience.
For the ease of controlling scraper plate, the sliding groove 16 is T-type sliding groove 16, the separate scraper plate 12 of the sliding shoe 17
One end is equipped with the limit plate 18 being adapted with sliding groove 16, and spring 19 is equipped between 18 bottom of limit plate and sliding groove 16,
Spring restores to the original state to pull scraper plate and be retracted in second shell, convenient for protecting scraper plate when not needed, and reduces because scraping
Plate is contacted with blackboard causes wiping blackboard inconvenient, improves convenience.
Causing to distort by pressing spring when in order to avoid using, mentioning report convenience, prolonging the service life, on the limit plate 18
Equipped with the first sliding cylinder 20, the sliding groove 16 is equipped with the second sliding cylinder 21 for matching with the first sliding cylinder 20, and described the
Two sliding cylinders 21 are set in outside the first sliding cylinder 20, and first sliding cylinder 20 can be moved along the second sliding cylinder 21, the bullet
Spring 19 is set in the first sliding cylinder 20, outside the second sliding cylinder 21, is that spring limits by the first sliding cylinder and the second sliding cylinder
Moving track, it is mobile convenient for control limit plate, and protect spring.
For the ease of releasing wiping board, allow to more easily multi-angle contact blackboard, the second shell 4 and wiping board 13
Between be equipped with telescopic rod 22, preferably, telescopic rod be electric telescopic rod, between second water hole 5 and third water hole 14
Equipped with sliding sleeve 23, water flows to wiping board by sliding sleeve, can control wiping board by telescopic rod and stretches out second shell, more just
Benefit is contacted with blackboard.
For the ease of keeping bristle dry, the side wall of the second shell 4 is equipped with hair dryer 24, the hair dryer 24
Outlet air end is inconvenient to wipe blackboard sometimes towards 15 direction of bristle, wet bristle, can dry up bristle by hair dryer, will fill
Placement location can also accelerate the drying of blackboard, next time convenient for teacher at the blackboard position just drenched by hair dryer
It writes here.Hook etc. can also be arranged to hang over device at blackboard position, blackboard is brushed, the body of user is reduced
Power consumption.
Embodiment:
A kind of teaching chalk writing erasing apparatus is equipped with the first shell 1 of opening, the first shell 1 including side
Bottom be equipped with water storage box 2, can by welding or bolted mode realize, the water storage box 2 be equipped with water inlet, institute
The opening of water storage box 2 is stated towards first shell 1, the bottom wall of the first shell 1 is equipped with several first water holes 3, and described the
It is equipped with opening in one shell 1 towards the second shell 4 of the opening side of first shell 1, has between first shell and second shell
There is certain gap, the bottom wall of the second shell 4 is equipped with the second water hole 5 matched with the first water hole 3, and described the
The side of the bottom wall of the close first shell 1 of two shells 4 is set there are two supporting block 6, can by weld or be bolted it is equal just
Formula is realized, lead screw 7 is equipped between two supporting blocks 6, and the lead screw 7 connects motor, and the motor connects power supply, and power supply can
To be battery, control switch is set to control the start and stop of motor, the lead screw 7 is equipped with the screw 8 matched with lead screw 7,
The screw 8 is equipped with catch bar 9, and one end of the separate screw 8 of the catch bar 9 is equipped with control group, and the control group includes
Closed plate 10, the gap between the closed plate 10 and first shell 1 and second shell 4 are adapted, set in the closed plate 10
There is the through hole 11 matched with the second water hole 5,10 movement of closed plate can make through hole 11 and the first water hole 3,
The connection of two water holes 5, the side wall of the second shell 4 are equipped with scraper plate 12, the scraper plate 12 can protruding second shell 4,
The sliding groove 16 is T-type sliding groove 16, and one end of the separate scraper plate 12 of the sliding shoe 17 is equipped with to be adapted with sliding groove 16
Limit plate 18, spring 19 is equipped between 18 bottom of limit plate and sliding groove 16, it is sliding that the limit plate 18 is equipped with first
Dynamic cylinder 20, the sliding groove 16 are equipped with the second sliding cylinder 21 matched with the first sliding cylinder 20, second sliding cylinder 21
It is set in outside the first sliding cylinder 20, first sliding cylinder 20 can be moved along the second sliding cylinder 21, and the spring 19 is set in
Outside first sliding cylinder 20, the second sliding cylinder 21, it is equipped with wiping board 13 in the second shell 4, scraper plate is set to second shell
Between the gap of the side wall of side wall and wiping board, scraper plate stretches out second shell, can root out the chalk marking of blackboard upper process, described
Wiping board 13 is equipped with the third water hole 14 being adapted with the second water hole 5, and water can flow to wiping board from second shell, in third
Water pump is set on water hole, spray nozzle is set on third water hole, telescopic rod is equipped between the second shell 4 and wiping board 13
22, preferably, telescopic rod is electric telescopic rod, sliding sleeve 23 is equipped between second water hole 5 and third water hole 14,
The side of the separate second shell 4 of the wiping board 13 is equipped with bristle 15, and bristle is for wiping blackboard, the side of the second shell 4
Wall is equipped with hair dryer 24, and the outlet air end of the hair dryer 24 is towards 15 direction of bristle.
Claims (6)
1. a kind of teaching chalk writing erasing apparatus, it is characterized in that: include the first shell (1) that side is equipped with opening, it is described
The bottom of first shell (1) is equipped with water storage box (2), and the water storage box (2) is equipped with water inlet, the opening of the water storage box (2)
Towards first shell (1), the bottom wall of the first shell (1) is equipped with several first water holes (3), the first shell (1)
Interior to be equipped with the second shell (4) being open towards the opening side of first shell (1), the bottom wall of the second shell (4) is equipped with
The second water hole (5) matched with the first water hole (3), the bottom wall of the close first shell (1) of the second shell (4)
Side is set there are two supporting block (6), is equipped with lead screw (7) between two supporting blocks (6), and the lead screw (7) connects motor, institute
Motor connection power supply is stated, the lead screw (7) is equipped with the screw (8) matched with lead screw (7), and the screw (8) is equipped with and pushes away
One end of lever (9), the separate screw (8) of the catch bar (9) is equipped with control group, and the control group includes closed plate (10),
Gap between the closed plate (10) and first shell (1) and second shell (4) is adapted, and the closed plate (10) is equipped with
The through hole (11) matched with the second water hole (5), closed plate (10) movement can make through hole (11) to cross water with first
Hole (3), the second water hole (5) connection, the side wall of the second shell (4) are equipped with scraper plate (12), and the scraper plate (12) can be to
Outer stretching second shell (4), the second shell (4) is interior to be equipped with wiping board (13), and the wiping board (13), which is equipped with, crosses water with second
The side of the adaptable third water hole (14) in hole (5), the separate second shell (4) of the wiping board (13) is equipped with bristle (15).
2. a kind of teaching chalk writing erasing apparatus according to claim 1, it is characterized in that: the first shell (1)
Side wall be equipped with sliding groove (16), be equipped with sliding shoe (17) in the sliding groove (16), the sliding shoe (17) close to the
One end of two shells (4) connects scraper plate (12).
3. a kind of teaching chalk writing erasing apparatus according to claim 2, it is characterized in that: the sliding groove (16) is
T-type sliding groove (16), one end of the separate scraper plate (12) of the sliding shoe (17) are equipped with the limit being adapted with sliding groove (16)
Plate (18) is equipped with spring (19) between limit plate (18) bottom and sliding groove (16).
4. a kind of teaching chalk writing erasing apparatus according to claim 3, it is characterized in that: on the limit plate (18)
Equipped with the first sliding cylinder (20), the sliding groove (16) is equipped with the second sliding cylinder matched with the first sliding cylinder (20)
(21), second sliding cylinder (21) is set in the first sliding cylinder (20) outside, and first sliding cylinder (20) can be sliding along second
Dynamic cylinder (21) are mobile, and it is external that the spring (19) is set in the first sliding cylinder (20), the second sliding cylinder (21).
5. a kind of teaching chalk writing erasing apparatus according to claim 1 or 2, it is characterized in that: the second shell
(4) telescopic rod (22) are equipped between wiping board (13), sliding is equipped between second water hole (5) and third water hole (14)
Sleeve (23).
6. a kind of teaching chalk writing erasing apparatus according to claim 1 or 2, it is characterized in that: the second shell
(4) side wall is equipped with hair dryer (24), and the outlet air end of the hair dryer (24) is towards bristle (15) direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811434685.5A CN109228753A (en) | 2018-11-28 | 2018-11-28 | A kind of teaching chalk writing erasing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811434685.5A CN109228753A (en) | 2018-11-28 | 2018-11-28 | A kind of teaching chalk writing erasing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109228753A true CN109228753A (en) | 2019-01-18 |
Family
ID=65074310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811434685.5A Pending CN109228753A (en) | 2018-11-28 | 2018-11-28 | A kind of teaching chalk writing erasing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109228753A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110154600A (en) * | 2019-05-31 | 2019-08-23 | 毛潞 | It erases the board and uses auxiliary device |
| CN114132110A (en) * | 2021-12-07 | 2022-03-04 | 江苏经贸职业技术学院 | Teaching is with teaching board that is favorable to improving teaching efficiency |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202368205U (en) * | 2011-12-19 | 2012-08-08 | 郭军 | Dustless blackboard eraser |
| CN203078121U (en) * | 2013-01-18 | 2013-07-24 | 姜博皓 | Blackboard cleaning device |
| CN203254837U (en) * | 2013-03-05 | 2013-10-30 | 刘桂龙 | Novel blackboard eraser |
| CN203611616U (en) * | 2013-12-25 | 2014-05-28 | 邢台学院 | Eraser |
| CN205130752U (en) * | 2015-10-23 | 2016-04-06 | 石家庄科达文教用品有限公司 | It wipes to scrape board -like sponge board |
| CN106739703A (en) * | 2017-01-16 | 2017-05-31 | 赵子宁 | A kind of electric dustless blackboard eraser |
| CN206561720U (en) * | 2016-12-28 | 2017-10-17 | 辽宁科技学院 | One kind can quick line drawing formula Simple blackboard |
| CN206614975U (en) * | 2017-02-21 | 2017-11-07 | 王淳 | The adsorbable formula blackboard eraser of chalk dust |
| CN206968256U (en) * | 2017-04-12 | 2018-02-06 | 朱文泽 | A kind of novel blackboard eraser |
-
2018
- 2018-11-28 CN CN201811434685.5A patent/CN109228753A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202368205U (en) * | 2011-12-19 | 2012-08-08 | 郭军 | Dustless blackboard eraser |
| CN203078121U (en) * | 2013-01-18 | 2013-07-24 | 姜博皓 | Blackboard cleaning device |
| CN203254837U (en) * | 2013-03-05 | 2013-10-30 | 刘桂龙 | Novel blackboard eraser |
| CN203611616U (en) * | 2013-12-25 | 2014-05-28 | 邢台学院 | Eraser |
| CN205130752U (en) * | 2015-10-23 | 2016-04-06 | 石家庄科达文教用品有限公司 | It wipes to scrape board -like sponge board |
| CN206561720U (en) * | 2016-12-28 | 2017-10-17 | 辽宁科技学院 | One kind can quick line drawing formula Simple blackboard |
| CN106739703A (en) * | 2017-01-16 | 2017-05-31 | 赵子宁 | A kind of electric dustless blackboard eraser |
| CN206614975U (en) * | 2017-02-21 | 2017-11-07 | 王淳 | The adsorbable formula blackboard eraser of chalk dust |
| CN206968256U (en) * | 2017-04-12 | 2018-02-06 | 朱文泽 | A kind of novel blackboard eraser |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110154600A (en) * | 2019-05-31 | 2019-08-23 | 毛潞 | It erases the board and uses auxiliary device |
| CN114132110A (en) * | 2021-12-07 | 2022-03-04 | 江苏经贸职业技术学院 | Teaching is with teaching board that is favorable to improving teaching efficiency |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202225626U (en) | Blackboard capable of removing chalk dust automatically | |
| CN109228753A (en) | A kind of teaching chalk writing erasing apparatus | |
| CN203844486U (en) | Multifunctional marking tool for English teaching | |
| CN107933156A (en) | A kind of ideological and political education clipboard | |
| CN206306691U (en) | A kind of dust-proof blackboard eraser | |
| CN201881778U (en) | Blackboard eraser capable of spraying water | |
| CN206678651U (en) | A kind of blackboard for English teaching wipes dirt device | |
| CN201201453Y (en) | Full automatic blackboard eraser | |
| CN109228748A (en) | A kind of blackboard and its application method suitable for English teaching | |
| CN209063766U (en) | A kind of English teaching auxiliary device | |
| CN208714761U (en) | One kind changing face automatic-cleaning backboard | |
| CN206367324U (en) | A kind of blackboard eraser with dust-absorbing function | |
| CN107244169B (en) | A kind of cleaning chalkboard eraser | |
| CN201235689Y (en) | Novel blackboard eraser | |
| CN201506168U (en) | Dust-free blackboard eraser | |
| CN204383021U (en) | Dust-proof blackboard eraser | |
| CN205853702U (en) | A kind of dust-proof cleaning blackboard eraser | |
| CN215513016U (en) | Use convenient dust collector for classroom teaching blackboard | |
| CN202448578U (en) | Convenient and practical blackboard | |
| CN202573533U (en) | Whiteboard eraser capable of spraying cleaning agent | |
| CN204077185U (en) | Language teaching is facilitated to be with the board of education device of perpendicular wiping board brush | |
| CN203126302U (en) | Dust-removing eraser | |
| CN204414968U (en) | A kind of multifunctional blackboard eraser | |
| CN204383006U (en) | A kind of blackboard eraser | |
| CN201009608Y (en) | Telescopic blackboard eraser |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190118 |