CN207842468U - Blackboard eraser - Google Patents
Blackboard eraser Download PDFInfo
- Publication number
- CN207842468U CN207842468U CN201721175302.8U CN201721175302U CN207842468U CN 207842468 U CN207842468 U CN 207842468U CN 201721175302 U CN201721175302 U CN 201721175302U CN 207842468 U CN207842468 U CN 207842468U
- Authority
- CN
- China
- Prior art keywords
- blackboard
- track groove
- wiping board
- along
- length
- 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
Landscapes
- Drawing Aids And Blackboards (AREA)
Abstract
The utility model discloses a kind of blackboard eraser, upper rail, blackboard and lower rail are sequentially fixed on wall from top to bottom；Two the first track grooves and the second track groove for being mutually parallel and being open towards upper rail are provided in lower rail along its length；Two articles of be mutually parallel third track groove and the 4th track grooves are provided in upper rail along its length；The upper end of left wiping board is plugged in third track groove, lower end can be slided along the length direction of the first track groove, the upper end of right wiping board is plugged in the 4th track groove, lower end can be slided along the length direction of the second track groove, left wiping board is provided with the left cleaning block being in contact with blackboard on the surface towards blackboard, right wiping board is provided with the right cleaning block being in contact with blackboard on the surface towards blackboard；The side of the lower face of left wiping board wiping board to the right is connected with left limit plate, and the side of the lower face of right wiping board wiping board to the left is connected with right limit plate.The blackboard eraser can efficiently erase the board.
Description
Technical field
The utility model is related to writing implements, more particularly to blackboard eraser.
Background technology
The teaching of writing on the blackboard formula is a classroom instruction indispensable part forever, and either traditional papery teaching notes match writing on the blackboard
Form, still widely applied multimedia teaching now, is still just being intended to Informalized teaching ahead of fashions, the cognition from kindergarten
It imparts knowledge to students to the professional teaching even Research Teaching of university, writing on the blackboard is various places to operate schools and research communicating site forever
In the important element that can not ignore.Teacher at school during, because of blackboard limited area, often a class gets off, need frequency
It is numerous to erase the board, however the speed of traditional blackboard eraser blackboard wiping is very slow, influences very much efficiency of attending class.
Utility model content
The purpose of this utility model is to provide a kind of blackboard eraser, which can solve traditional blackboard and wipe slow ask
Topic, improves the wiping efficiency of blackboard, has saved more hours of instruction.
To achieve the goals above, the utility model provides a kind of blackboard eraser, which includes upper rail, lower rail, a left side
Wiping board and right wiping board, the upper rail, blackboard and the lower rail are sequentially fixed on wall from top to bottom；Its length of the lower rail upper edge
Degree direction is provided with two the first track grooves and the second track groove for being mutually parallel and being open towards the upper rail, wherein described
Second track groove is close to the side of the wall；Two are provided in the upper rail along its length to be mutually parallel and the court that is open
To the third track groove and the 4th track groove of the lower rail, wherein the 4th track groove is close to the side of the wall；It is described
The upper end of left wiping board is plugged in the third track groove, and the lower end of the left wiping board can be along the length of first track groove
Direction is slided, and the upper end of the right wiping board is plugged in the 4th track groove, and the lower end of the right wiping board can be along described the
The length direction of two track grooves slides, and is provided on the surface of the left wiping board towards the blackboard and connects with the blackboard
Tactile left cleaning block is provided with the right cleaning block being in contact with the blackboard on the surface of the right wiping board towards the blackboard；
Side of the lower end of the left wiping board towards the right wiping board is connected with left limit plate, and the lower end of the right wiping board is towards the left side
The side of wiping board is connected with right limit plate.
Preferably, be provided with left strip through-hole on the left limit plate along its length, the left strip through-hole it is upper
End is provided with left guiding rack along its length, is provided with right strip through-hole, institute on the right limit plate along its length
The lower end for stating right strip through-hole is provided with right guiding rack along its length；It is provided in the lower rail and is communicated in described first
The rotation slot of track groove and second track groove is provided with the rotation axis for capableing of rotation, the rotation axis in the rotation slot
One end be arranged with left gear, the other end is arranged with right gear, and the left gear is ratcheting in the left guiding rack, the right tooth
The gear teeth are together in the right guiding rack.
Preferably, the both ends of the left strip through-hole are respectively arranged with the first bolster and the second bolster.
Preferably, first bolster includes：First spring and the first buffer board, the both ends difference of first spring
It is fixed in one end of the left strip through-hole and first buffer board, and first buffer board can be along the left strip through-hole
Length direction sliding；Second bolster includes：Second spring and the second buffer board, the both ends difference of the second spring
It is fixed in the other end of the left strip through-hole and second buffer board, and second buffer board can be logical along the left bar shaped
The length direction in hole slides.
Preferably, the length of first track groove, the second track groove, third track groove and the 4th track groove is identical, and
More than the length of the blackboard.
Preferably, the bottom end of the left limit plate and the right limit plate is provided with along respective length direction multiple respectively
Slide assemblies.
Preferably, the slide assemblies include：Supporting plate, wheel shaft and wheel body, two supporting plates are described along being parallel to
The width direction interval of left limit plate or the right limit plate is arranged, and the both ends of the wheel shaft are plugged in two holders respectively
On plate, the wheel body can be rotationally sheathed on using the axis of the wheel shaft as axis on the wheel shaft, the wheel body portion protrusion
The lower face of the supporting plate.
Preferably, the blackboard eraser further includes ash collection slot, the ash collection slot between the blackboard and the lower rail, and
It is fixed on the wall, the upper end of the ash collection slot is set as open, and a side of the ash collection slot far from the wall
Divide protrusion the end face of the blackboard far from the wall.
Preferably, the both ends of the ash collection slot are both provided with cinder-discharging port.
Preferably, the blackboard eraser further includes water pipe, and the water pipe is parallel to the upper rail, and the water pipe is along described
The upper rail is partly stretched between four tracks and the wall, and multiple water sprays are provided with and communicated with along its length on the water pipe
Pipe, is provided with shower on the sparge pipe, and the sprinkling direction of the shower is located on described on the water pipe towards the blackboard
The outside of rail is provided with valve.
According to above-mentioned technical proposal, in the utility model, the upper rail, blackboard and the lower rail are sequentially affixed from top to bottom
In on wall；Two the first tracks for being mutually parallel and being open towards the upper rail are provided in the lower rail along its length
Slot and the second track groove, wherein second track groove is close to the side of the wall；It is set along its length in the upper rail
It is equipped with two articles of third track grooves and the 4th track groove for being mutually parallel and being open towards the lower rail, wherein the 4th track
Slot is close to the side of the wall；The upper end of the left wiping board is plugged in the third track groove, the lower end of the left wiping board
It can be slided along the length direction of first track groove, the upper end of the right wiping board is plugged in the 4th track groove, institute
Stating the lower end of right wiping board can slide along the length direction of second track groove, the part of the left wiping board towards the blackboard
It is provided with the left cleaning block being in contact with the blackboard on side, is provided on the surface of the right wiping board towards the blackboard
The right cleaning block being in contact with the blackboard；Side of the lower end of the left wiping board towards the right wiping board is connected with left limit plate,
Side of the lower end of the right wiping board towards the left wiping board is connected with right limit plate.By the left wiping board of movement and right wiping board
Horizontally slip the wiping that can be realized to blackboard in one track groove and the second track groove, and entire blackboard is divided into the wiping of two pieces of left and right
Wipe region, use when at most wipes blackboard twice can be clean by blackboard-cleaning, and traditional blackboard eraser then needs not stop
Wiping just can be with.
Other feature and advantage of the utility model will be described in detail in subsequent specific embodiment part.
Description of the drawings
Attached drawing is to be used to provide a further understanding of the present invention, an and part for constitution instruction, and following
Specific implementation mode be used to explain the utility model together, but do not constitute limitations of the present invention.In the accompanying drawings：
Fig. 1 is a kind of front view of preferred embodiment of blackboard eraser in the utility model；
Fig. 2 is a kind of structural schematic diagram of preferred embodiment of left limit plate in the utility model；
Fig. 3 is a kind of structural schematic diagram of preferred embodiment of right limit plate in the utility model；
Fig. 4 is a kind of longitdinal cross-section diagram of preferred embodiment of lower rail in the utility model；
Fig. 5 is a kind of preferred embodiment right view of the blackboard eraser relative to Fig. 1 in the utility model.
Reference sign
10 blackboard, 20 upper rail
30 lower rail, 60 rotation axis
11 ash collection slot, 21 water pipe
22 sparge pipe, 23 valve
41 left wiping board, 42 left limit plate
51 right wiping board, 52 right limit plate
61 left gear, 62 right gear
71 first spring, 72 first buffer board
81 second spring, 82 second buffer board
90 slide assemblies, 91 supporting plate
92 wheel body, 111 cinder-discharging port
411 left cleaning block, 511 right cleaning block
421 left guiding rack, 521 right guiding rack
Specific implementation mode
Specific embodiment of the present utility model is described in detail below in conjunction with attached drawing.It should be understood that herein
Described specific implementation mode is only used for describing and explaining the present invention, and is not intended to limit the utility model.
In the present invention, in the absence of explanation to the contrary, " up and down, front and back inside and outside " etc. is included in term
In the noun of locality only represent orientation of the term under normal service condition, or be those skilled in the art understand that be commonly called as, and
It is not construed as the limitation to the term.
Referring to blackboard eraser shown in Fig. 1-5, which includes upper rail 20, lower rail 30, left wiping board 41 and right wiping board 51, institute
Upper rail 20, blackboard 10 and the lower rail 30 is stated sequentially to be fixed on wall from top to bottom；In the lower rail 30 along its length
It is provided with two the first track grooves and the second track groove for being mutually parallel and being open towards the upper rail 20, wherein described second
Track groove is close to the side of the wall；Two are provided in the upper rail 20 along its length to be mutually parallel and the direction that is open
The third track groove and the 4th track groove of the lower rail 30, wherein the 4th track groove is close to the side of the wall；It is described
The upper end of left wiping board 41 is plugged in the third track groove, and the lower end of the left wiping board 41 can be along first track groove
Length direction slides, and the upper end of the right wiping board 51 is plugged in the 4th track groove, and the lower end of the right wiping board 51 can
Length direction along second track groove slides, be provided on 41 surface towards the blackboard 10 of the left wiping board with
The left cleaning block 411 that the blackboard 10 is in contact, is provided on 51 surface towards the blackboard 10 of the right wiping board and institute
State the right cleaning block 511 that blackboard 10 is in contact；Side of the lower end of the left wiping board 41 towards the right wiping board 51 is connected with left limit
Position plate 42, the lower end of the right wiping board 51 is connected with right limit plate 52 towards the side of the left wiping board 41.
Through the implementation of the above technical solution, the upper rail 20, blackboard 10 and the lower rail 30 are sequentially affixed from top to bottom
In on wall；Be provided with along its length in the lower rail 30 two be mutually parallel and be open towards the upper rail 20 first
Track groove and the second track groove, wherein second track groove is close to the side of the wall；In the upper rail 20 along its length
Direction is provided with two articles of third track grooves and the 4th track groove for being mutually parallel and being open towards the lower rail 30, wherein described
4th track groove is close to the side of the wall；The upper end of the left wiping board 41 is plugged in the third track groove, the left side
The lower end of wiping board 41 can be slided along the length direction of first track groove, and the upper end of the right wiping board 51 is plugged in described
In four track grooves, the lower end of the right wiping board 51 can be slided along the length direction of second track groove, the left wiping board 41
The left cleaning block 411 being in contact with the blackboard 10,51 face of right wiping board are provided on surface towards the blackboard 10
The right cleaning block 511 being in contact with the blackboard 10 is provided on the surface of the blackboard 10；Under the left wiping board 41
End face is connected with left limit plate 42 to the side of the right wiping board 51, and the lower end of the right wiping board 51 is towards the left wiping board 41
Side is connected with right limit plate 52.By the left wiping board 41 of movement and right wiping board 51 in the first track groove and the second track groove or so
Wiping to blackboard 10 can be realized in sliding, and entire blackboard 10 is divided into the two pieces of wiped areas in left and right, when use at most
Blackboard 10 can be clean by blackboard-cleaning twice for wiping, and then need ceaselessly to wipe just can be with for traditional blackboard eraser.
In this embodiment, in order to further increase the efficiency of blackboard wiping 10, it is preferable that on the left limit plate 42
It is provided with left strip through-hole along its length, the upper end of the left strip through-hole is provided with left guiding rack along its length
421, it is provided with right strip through-hole along its length on the right limit plate 52, the lower end of the right strip through-hole is along its length
Direction is provided with right guiding rack 521；It is provided in the lower rail 30 and is communicated in first track groove and second track
The rotation slot of slot is provided with the rotation axis 60 for capableing of rotation in the rotation slot, and one end of the rotation axis 60 is arranged with left tooth
Wheel 61, the other end is arranged with right gear 62, and the left gear 61 is ratcheting in the left guiding rack 421,62 tooth of the right gear
Together in the right guiding rack 521.When any one of the left wiping board 41 of movement or right wiping board 51, left gear 61 or the right side are driven
Gear 62 rotates, since left gear 61 and right gear 62 are ratcheting in left guiding rack 421 and right guiding rack 521 respectively, and tooth
The position of conjunction is that up and down therefore opposite direction can move any of which one of left wiping board 41 and right wiping board 51, in addition one
It is a to be moved towards the direction opposite with the wiping board moved, other one when so as to realize 10 one side of blackboard wiping
Side can automatically wipe, and further save the time of half.
In this embodiment, in order to protect left strip through-hole and right strip through-hole, making them, the service life is longer, excellent
The both ends of selection of land, the left strip through-hole are respectively arranged with the first bolster and the second bolster.Every time wipe both ends or
When intermediate, buffer protection can be played the role of by the first bolster or the second bolster.
In this embodiment, in order to further realize the cushioning effect of the first bolster and the second bolster, it is preferable that
First bolster includes：First spring 71 and the first buffer board 72, the both ends of first spring 71 are respectively and fixedly connected in institute
One end of left strip through-hole and first buffer board 72 are stated, and first buffer board 72 can be along the length of the left strip through-hole
Spend direction sliding；Second bolster includes：Second spring 81 and the second buffer board 82, the both ends point of the second spring 81
It is not fixed in the other end of the left strip through-hole and second buffer board 82, and second buffer board 82 can be along the left side
The length direction of strip through-hole slides.
In this embodiment, in order to comprehensive blackboard wiping 10, dead angle is not stayed, it is preferable that first rail
Road slot, the second track groove, the length of third track groove and the 4th track groove are identical, and more than the length of the blackboard 10.
In this embodiment, in order to mitigate the labour burden of user, increase the portability of sliding, it is preferable that
The bottom end of the left limit plate 42 and the right limit plate 52 is provided with multiple slide assemblies along respective length direction respectively.It is logical
Cross the frictional force that slide assemblies reduce sliding.
In this embodiment, in order to further mitigating the labour burden of user, it is preferable that the slide assemblies
Including：Supporting plate 91, wheel shaft and wheel body 92, two supporting plates 91 are along being parallel to the left limit plate 42 or the right limit
The width direction interval of plate 52 is arranged, and the both ends of the wheel shaft are plugged in respectively on two supporting plates 91, the wheel body 92
It can be rotationally sheathed on the wheel shaft using the axis of the wheel shaft as axis, the supporting plate 91 is protruded in 92 part of the wheel body
Lower face.The lower face of 92 part protruding bracket plate 91 of wheel body is that supporting plate 91 contacts polishing, shadow with lower rail 30 in order to prevent
Sliding experience is rung, the convenience of sliding is improved.
In this embodiment, in order to more collecting chalk dust, it is preferable that the blackboard eraser further includes ash collection slot
11, the ash collection slot 11 is fixed between the blackboard 10 and the lower rail 30 on the wall, the ash collection slot 11
Upper end be set as open, and a side section of the ash collection slot 11 far from the wall protrudes the blackboard 10 far from the wall
The end face of body.Ash collection slot 11 is greater than the cross-sectional length of corresponding blackboard 10 perpendicular to the vertical section length of metope, in this way
Ash collection slot 11 is greater than blackboard 10, the chalk dust that blackboard 10 is fallen when writing relative to the extension elongation of metope
It directly falls in ash collection slot 11.
In this embodiment, in order to facilitate ash discharge, it is preferable that the both ends of the ash collection slot 11 are both provided with cinder-discharging port
111。
In this embodiment, blackboard 10 is cleaned for convenience, it is preferable that the blackboard eraser further includes water pipe
21, the water pipe 21 is parallel to the upper rail 20, and the water pipe 21 is partly stretched between the 4th track and the wall
Enter the upper rail 20, is provided with and communicated with multiple sparge pipes 22 on the water pipe 21 along its length, is set on the sparge pipe 22
It is equipped with shower, towards the blackboard 10, the outside that the upper rail 20 is located on the water pipe 21 is set for the sprinkling direction of the shower
It is equipped with valve 23.The inside that water pipe 21 extend into upper rail 20 should not influence the work of third track groove and the 4th track groove, and
Three track grooves, the 4th track groove and water pipe 21 are the setting at interval, and the side wall of upper rail 20 is stretched out in 22 part of sparge pipe, and connects
There are shower, the sprinkling direction of the shower to be also convenient for, to the cleaning of blackboard 10, eliminating and still further fetching water towards the blackboard 10
Worries.
Preferred embodiments of the present invention, still, the utility model and unlimited are described in detail above in association with attached drawing
Detail in the above embodiment can be to the skill of the utility model in the range of the technology design of the utility model
Art scheme carries out a variety of simple variants, these simple variants belong to the scope of protection of the utility model.
It is further to note that specific technical features described in the above specific embodiments, in not lance
It in the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the utility model is to each
The possible combination of kind no longer separately illustrates.
In addition, arbitrary combination can also be carried out between a variety of different embodiments of the utility model, as long as it is not disobeyed
The thought for carrying on the back the utility model, equally should be considered as content disclosed in the utility model.
Claims (10)
1. a kind of blackboard eraser, which is characterized in that the blackboard eraser includes upper rail (20), lower rail (30), left wiping board (41) and right wiping
Plate (51), the upper rail (20), blackboard (10) and the lower rail (30) are sequentially fixed on wall from top to bottom；
Be provided with along its length on the lower rail (30) two be mutually parallel and be open towards the upper rail (20) first
Track groove and the second track groove, wherein second track groove is close to the side of the wall；
It is provided with two thirds for being mutually parallel and being open towards the lower rail (30) along its length on the upper rail (20)
Track groove and the 4th track groove, wherein the 4th track groove is close to the side of the wall；
The upper end of the left wiping board (41) is plugged in the third track groove, and the lower end of the left wiping board (41) can be along described
The length direction of first track groove slides, and the upper end of the right wiping board (51) is plugged in the 4th track groove, the right wiping
The lower end of plate (51) can be slided along the length direction of second track groove, and the left wiping board (41) is towards the blackboard (10)
Surface on be provided with the left cleaning block (411) being in contact with the blackboard (10), the right wiping board (51) is towards described black
The right cleaning block (511) being in contact with the blackboard (10) is provided on the surface of plate (10)；
Side of the lower end of the left wiping board (41) towards the right wiping board (51) is connected with left limit plate (42), the right wiping board
(51) side of the lower end towards the left wiping board (41) is connected with right limit plate (52).
2. blackboard eraser according to claim 1, which is characterized in that be arranged along its length on the left limit plate (42)
There are left strip through-hole, the upper end of the left strip through-hole to be provided with left guiding rack (421), the right limit along its length
Right strip through-hole is provided on plate (52) along its length, the lower end of the right strip through-hole is provided with the right side along its length
It is oriented to rack (521)；
It is provided with the rotation slot for being communicated in first track groove and second track groove, the rotation on the lower rail (30)
The rotation axis (60) for capableing of rotation is provided in slot, one end of the rotation axis (60) is arranged with left gear (61), another end cap
Equipped with right gear (62), the left gear (61) is ratcheting in the left guiding rack (421), and the right gear (62) is ratcheting in institute
State right guiding rack (521).
3. blackboard eraser according to claim 2, which is characterized in that the both ends of the left strip through-hole are respectively arranged with first
Bolster and the second bolster.
4. blackboard eraser according to claim 3, which is characterized in that first bolster includes：First spring (71) and
The both ends of first buffer board (72), first spring (71) are respectively and fixedly connected in one end of the left strip through-hole and described first
Buffer board (72), and first buffer board (72) can be slided along the length direction of the left strip through-hole；
Second bolster includes：Second spring (81) and the second buffer board (82), the both ends point of the second spring (81)
It is not fixed in the other end and second buffer board (82) of the left strip through-hole, and second buffer board (82) can be along institute
State the length direction sliding of left strip through-hole.
5. blackboard eraser according to claim 1, which is characterized in that first track groove, the second track groove, third track
The length of slot and the 4th track groove is identical, and more than the length of the blackboard (10).
6. blackboard eraser according to claim 1, which is characterized in that the left limit plate (42) and the right limit plate (52)
Bottom end respective length direction is provided with multiple slide assemblies (90) respectively.
7. blackboard eraser according to claim 6, which is characterized in that the slide assemblies (90) include：Supporting plate (91), wheel
Axis and wheel body (92), two supporting plates (91) are along the width for being parallel to the left limit plate (42) or the right limit plate (52)
The setting of direction interval is spent, the both ends of the wheel shaft are plugged in respectively on two supporting plates (91), and the wheel body (92) can
It is rotationally sheathed on the wheel shaft using the axis of the wheel shaft as axis, the wheel body (92) partly protrudes the supporting plate (91)
Lower face.
8. blackboard eraser according to claim 1, which is characterized in that the blackboard eraser further includes ash collection slot (11), the collection
Ash-pit (11) is fixed between the blackboard (10) and the lower rail (30) on the wall, the ash collection slot (11)
Upper end be set as open, and a side section of the ash collection slot (11) far from the wall protrudes the blackboard (10) far from institute
State the end face of wall.
9. blackboard eraser according to claim 8, which is characterized in that the both ends of the ash collection slot (11) are both provided with cinder-discharging port
(111)。
10. blackboard eraser according to claim 9, which is characterized in that the blackboard eraser further includes water pipe (21), the water pipe
(21) be parallel to the upper rail (20), and the water pipe (21) partly stretched between the 4th track and the wall it is described
Upper rail (20), is provided with and communicated with multiple sparge pipes (22) on the water pipe (21) along its length, on the sparge pipe (22)
It is provided with shower, the sprinkling direction of the shower is located at the upper rail (20) towards the blackboard (10) on the water pipe (21)
Outside be provided with valve (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721175302.8U CN207842468U (en) | 2017-09-14 | 2017-09-14 | Blackboard eraser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721175302.8U CN207842468U (en) | 2017-09-14 | 2017-09-14 | Blackboard eraser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207842468U true CN207842468U (en) | 2018-09-11 |
Family
ID=63425336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721175302.8U Expired - Fee Related CN207842468U (en) | 2017-09-14 | 2017-09-14 | Blackboard eraser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207842468U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113212037A (en) * | 2021-04-27 | 2021-08-06 | 陈梓佳 | Clean blackboard |
-
2017
- 2017-09-14 CN CN201721175302.8U patent/CN207842468U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113212037A (en) * | 2021-04-27 | 2021-08-06 | 陈梓佳 | Clean blackboard |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201849154U (en) | Folding multifunctional blackboard | |
| CN207842468U (en) | Blackboard eraser | |
| CN204801319U (en) | Push -and -pull blackboard with self -lock device | |
| CN207182695U (en) | A kind of interactive intelligent blackboard | |
| CN205140384U (en) | Rotatory show teaching device of mathematic model | |
| CN203567408U (en) | Fan-shaped chalk clamp | |
| CN206446322U (en) | A kind of blank for having an erasing function | |
| CN2923370Y (en) | Dust-free blackboard eraser | |
| CN108177465A (en) | One kind can expanding type education and instruction auxiliary blank | |
| CN203600835U (en) | Novel mathematics teaching board | |
| CN204687679U (en) | A kind of Japanese Teaching is with can the chalkboard eraser of sucking chalk powder automatically | |
| CN204055057U (en) | The low dust blackboard of automatically cleaning | |
| CN203818865U (en) | Adjustable electric blackboard eraser | |
| CN204870245U (en) | Teaching is with chalkboard eraser that can inhale chalk dust automatically | |
| CN201186564Y (en) | Blackboard eraser for student | |
| CN106114008A (en) | A kind of teaching multi-functional blackboard | |
| CN206703785U (en) | A kind of didactic works write plate | |
| CN206154969U (en) | Multifunctional blackboard is used in teaching | |
| CN204257061U (en) | A kind of teaching aid of English teaching | |
| CN201951064U (en) | Blackboard capable of being wiped automatically | |
| CN213472632U (en) | But height-adjusting's biological teaching is with teaching board | |
| CN204801344U (en) | Teaching is with inhaling grey chalkboard eraser | |
| CN103895424A (en) | Blackboard cleaning device convenient and rapid to use | |
| CN204414912U (en) | A kind of automation dust-free blackboard | |
| CN207496330U (en) | A kind of curved blackboard easy to use |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180911 Termination date: 20200914 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |