CN108045135A - A kind of portable environmental-protection blackboard eraser - Google Patents
A kind of portable environmental-protection blackboard eraser Download PDFInfo
- Publication number
- CN108045135A CN108045135A CN201711410376.XA CN201711410376A CN108045135A CN 108045135 A CN108045135 A CN 108045135A CN 201711410376 A CN201711410376 A CN 201711410376A CN 108045135 A CN108045135 A CN 108045135A
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- China
- Prior art keywords
- eraser
- blackboard
- roller
- driving
- nut
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Classifications
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- 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
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- Drawing Aids And Blackboards (AREA)
Abstract
The present invention relates to a kind of portable environmental-protection blackboard eraser, including hand-held housing, driving device, transmission device, roller eraser；The hand-held housing includes outer cover body, upper driving chamber, middle drive cavity, lower rolling chamber；The driving device includes drive roller wheel, driving axis, drive bevel gear；The transmission device includes angled drive device, vertical transmission device；The roller eraser includes roller shaft, cylinder stack shell, bristle outer layer, driven pulley；A kind of portable environmental-protection blackboard eraser of the present invention is rotated by the bristle outer layer of roller eraser and considers the chalk on blackboard to be worth doing erasing；The rotating speed of the roller eraser can be adjusted, adjusts the effect of erasing chalk；The damping of the mobile blackboard eraser on blackboard can also be adjusted；Movement from left to right, the direction of motion and blackboard eraser moving direction are done on the contrary, considerably increasing the relative moving speed between bristle and blackboard in the bristle outer layer front end on blackboard, add the effect of erasing blackboard.
Description
Technical field
The present invention relates to blackboard eraser technical fields, and in particular to a kind of portable environmental-protection blackboard eraser.
Background technology
Blackboard eraser is essential instrument during school instruction, and being rubbed using blackboard eraser on blackboard can be by chalk
Bits are wiped.The blackboard eraser of the prior art is relatively simple, the main blackboard eraser main body for including being held with one and to blackboard friction
Soft fabric.
But the friction between the blackboard eraser of the prior art and blackboard is all by the relative displacement of blackboard eraser and blackboard Lai real
Existing, erasing effect is bad, causes to be frequently necessary to just wipe in the reciprocal friction in same position when erasing the board
Totally, it is therefore desirable to which design is a kind of rational in infrastructure, can realize the blackboard eraser fully to rub with blackboard, blackboard be wiped clean.
The content of the invention
In order to solve technical problem present in background technology, the present invention provides a kind of portable environmental-protection blackboard eraser, passes through roller
The bristle outer layer of cylinder eraser, which rotates, considers the chalk on blackboard to be worth doing erasing；The rotating speed of the roller eraser, adjustment erasing can be adjusted
The effect of chalk；The damping of the mobile blackboard eraser on blackboard can also be adjusted；A kind of portable environmental-protection of the present invention is black
Movement from left to right is done in blackboard eraser, the bristle outer layer front end on blackboard, the direction of motion with blackboard eraser moving direction on the contrary,
The relative moving speed between bristle and blackboard is considerably increased, adds the effect of erasing blackboard.
The technical solution adopted by the present invention to solve the technical problems is：
A kind of portable environmental-protection blackboard eraser, including hand-held housing, driving device, transmission device, roller eraser；
The hand-held housing includes：
Outer cover body, cuboid shape；
Upper driving chamber is located above the outer cover body, and hole on screw rod, the upper driving are equipped on the left of the upper driving chamber upper end
Chamber front face open is set；
Middle drive cavity is located in the middle part of the outer cover body, forms spacing board between the middle drive cavity and upper driving chamber, institute
It states and nut jack is equipped on the left of spacing board, be additionally provided with hole corresponding position on screw rod on the upper spacing board and set through nut jack
The screw insertion put, the middle drive cavity right side are equipped with right openings, and the right openings upper and lower is respectively equipped with upper and lower limit
Position plate, the upper and lower limit plate is arranged in parallel and inclined downward to the left；
Lower rolling chamber is located at the outer cover body the latter half, lower interval is formed between the lower rolling chamber and middle drive cavity
Plate, the lower spacing board left side is equipped with connection circular hole and limiting cylinder is equipped with above the connection circular hole, before the lower rolling chamber
End face opening is set；
The driving device includes：
Drive roller wheel is rotatably located in the upper driving chamber, before the drive roller wheel front end is emerging in the outer cover body
Side；
Axis is driven, is located in the middle part of the drive roller wheel lower face, the driving axis is in the upper spacing board is inserted into
In drive cavity；
Drive bevel gear is located at below the driving axis, in shape with wide top and narrow bottom；
The transmission device includes：
Angled drive device is located on the right side of the middle drive cavity and the inclination insertion tube of lower section extension to the left, is located at described tilt and inserts
The compression spring in tube inner chamber upper right side, the gear circular shaft being axially plugged in the inclination insertion tube along the inclination insertion tube are located at
The annular groove of the gear circular shaft outer wall is passed through the inclination insertion tube side wall and the square being inserted into the annular groove by lower section
Shape plug, the first screw rod being located at below the rectangular insert, the first nut with first screw flight cooperation, described the
For one nut between the upper limit plate, lower limiting board, the first nut side is through the right openings and is emerging in
On the right side of outer cover body, the angled drive device further include be located at gear circular shaft lower-left end and with the drive bevel gear left margin
It is driven the driven wheel of differential of cooperation, is coaxially located at the slave mantle disk of the driven cone pulley left end, it is described from mantle disk top half
Left side edge is set in vertical direction；
Vertical transmission device, including be rotatably located in the nut jack the second nut, be spirally connected with second nut
And the second screw rod being plugged in the screw insertion, the speed governing cross bar being vertically located at below second screw rod, the speed governing
The round outside but spuare inside slip insertion tube in cross section, described is rotatably equipped with equipped with /V circular hole in cross bar and in the /V circular hole
Vertical transmission device further includes the major diameter annulus for being located at the slip insertion tube and being located above speed governing cross bar, is located at the slip insertion tube
Path annulus below speed governing cross bar, the rectangle inserted link mating with the slip insertion tube are located at the rectangle inserted link
Lower end and the cylinder inserted link being inserted into via limiting cylinder in lower rolling chamber, the driving pulley for being located at the cylinder inserted link lower end, institute
State and nut jack is pierced by the left of the second nut is emerging on the left of outer cover body, the major diameter annulus with it is described from the mantle disk first half
Left side edge is divided to be sequentially connected；
The roller eraser includes：
Roller shaft is rotatably plugged in the upper and lower end face of lower rolling chamber；
Cylinder stack shell is located at the roller shaft circumference outer wall, in lower rolling chamber with one heart；
Bristle outer layer is located at the cylinder stack shell outer circumferential walls, is emerging in front of the bristle outer layer in front of outer cover body；
Driven pulley is located in the roller shaft, the side with the cylindrical drum, the driven pulley and the main belt
Wheel is sequentially connected by conveyer belt.
Further, the driving pulley outer wall, driven pulley outer circumferential walls, conveyer belt inner wall are equipped with anti-skid chequer.
Beneficial effects of the present invention：
A kind of portable environmental-protection blackboard eraser of the present invention is rotated by the bristle outer layer of roller eraser and considers the chalk on blackboard to be worth doing
Erasing.
A kind of portable environmental-protection blackboard eraser of the present invention, it is simple and quick, and can be adjusted：
Second nut is rotated while holding blackboard eraser and with finger, you can is adjusted the rotating speed of the roller eraser, is adjusted
The effect of erasing chalk；Or rotate first nut while holding blackboard eraser and with finger, you can adjust on blackboard
The damping of the mobile blackboard eraser.
A kind of portable environmental-protection blackboard eraser of the present invention, by taking the blackboard eraser that moves right as an example, regards what is seen from top to bottom
On figure direction, the drive roller wheel rotates in an anti-clockwise direction, and by the angled drive device drive the major diameter annulus,
It slides insertion tube to do rotationally clockwise, and then the rectangle inserted link, cylinder inserted link, driving pulley is driven to do and is turned clockwise
Dynamic, the driven pulley drives the roller shaft, cylinder stack shell, bristle outer layer to do rotationally clockwise, outside the bristle
Movement from left to right is done in layer front end on blackboard, and the direction of motion is with blackboard eraser moving direction on the contrary, considerably increasing bristle
Relative moving speed between blackboard adds the effect of erasing blackboard.
Description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is a kind of sectional view of embodiment of the blackboard eraser.
Fig. 2 is a kind of sectional view of embodiment of the blackboard eraser.
Fig. 3 is a kind of top view of embodiment of the blackboard eraser.
Fig. 4 is A portions enlarged diagram in Fig. 1.
Fig. 5 is a kind of sectional view of embodiment of the vertical transmission device.
In figure:
1. hand-held housing, 11. outer cover bodies, driving chamber on 12., hole on 12a. screw rods, drive cavity in 13., the upper spacing boards of 13a.,
13b. nut jacks, 13c. screw insertions, 13d. right openings, 13e. upper limit plates, 13f. lower limiting boards, 14. times rolling chambers,
Spacing board under 14a., 14b. limiting cylinders；
2. driving device, 21. drive roller wheels, 22. driving axis, 23. drive bevel gears；
3. transmission device, 31. angled drive devices, 31a. tilt insertion tube, 31b. compression springs, 31c. gear circular shafts 31d. annulars
Groove, 31e. rectangular inserts, the first screw rods of 31f., the first nuts of 31g., 31h. driven wheel of differential, 31i. are perpendicular from mantle disk, 32.
Direct-transmission device, the second nuts of 32a., the second screw rods of 32b., 32c. speed governing cross bars, 32d. slip insertion tubes, 32e. major diameter annulus,
32f. path annulus, 32g. rectangle inserted links, 32h. cylinder inserted links, 32i. driving pulleys；
4. roller eraser, 41. roller shafts, 42. cylinder stack shells, 43. bristle outer layers, 44. driven pulleys.
Specific embodiment
Below in conjunction with attached drawing, the present invention is described in further detail.
A kind of portable environmental-protection blackboard eraser, including hand-held housing 1, driving device 2, transmission device 3, roller eraser 4；
The hand-held housing 1 includes：
Outer cover body 11, cuboid shape；
Upper driving chamber 12 is located at 11 top of outer cover body, hole 12a on screw rod is equipped on the left of upper 12 upper end of driving chamber,
12 front face open of upper driving chamber is set；
Have benefited from said structure design, hole 12a avoids second spiral shell to be installed with the second screw rod 32b on the screw rod
Bar 32b is locked on 11 upper surface of outer cover body when being acted on uplink by the second nut 32a.
Middle drive cavity 13 is located at 11 middle part of outer cover body, is molded between the middle drive cavity 13 and upper driving chamber 12
There is upper spacing board 13a, be equipped on the left of the upper spacing board 13a on nut jack 13b, the upper spacing board 13a and hole on screw rod
12a corresponding positions are additionally provided with the screw insertion 13c set through nut jack 13b, and middle 13 right side of drive cavity is equipped with right side opening
Mouth 13d, the right openings 13d upper and lowers are respectively equipped with upper and lower limit plate（13e、13f）, the upper and lower limit plate（13e、
13f）It is arranged in parallel and inclined downward to the left；
Lower rolling chamber 14 is located at 11 the latter half of outer cover body, is molded between the lower rolling chamber 14 and middle drive cavity 13
There is lower spacing board 14a, connection circular hole is equipped on the left of the lower spacing board 14a and limiting cylinder is equipped with above the connection circular hole
14b, lower 14 front face open of rolling chamber are set；
The driving device 2 includes：
Drive roller wheel 21 is rotatably located in the upper driving chamber 12, and 21 front end of drive roller wheel is emerging in the shell
11 front of body；
Axis 22 is driven, is located in the middle part of 21 lower face of drive roller wheel, the driving axis 22 runs through the upper spacing board 13a
It is inserted into drive cavity 13；
Drive bevel gear 23 is located at 22 lower section of driving axis, in shape with wide top and narrow bottom；
The transmission device 3 includes：
Angled drive device 31, be located at 13 right side of the middle drive cavity and the inclination insertion tube 31a of lower section extension to the left, be located at it is described
It tilts the compression spring 31b in insertion tube 31a inner cavities upper right side, be axially plugged in the inclination insertion tube 31a along the inclination insertion tube 31a
Interior gear circular shaft 31c, the annular groove 31d for being located at the gear circular shaft 31c outer walls, the inclination insertion tube is passed through by lower section
31a side walls and the rectangular insert 31e being inserted into the annular groove 31d, the first screw rod being located at below the rectangular insert 31e
31f and the first nut 31g, the first nut 31g of the first screw rod 31f thread fittings are located at the upper limit plate
Between 13e, lower limiting board 13f, the first nut 31g sides are through the right openings 13d and are emerging in outer cover body 11
Right side, the angled drive device 31 further include be located at gear circular shaft 31c lower-lefts end and with 23 left margin of drive bevel gear
It is driven the driven wheel of differential 31h of cooperation, is coaxially located at the slave mantle disk 32i of the driven cone pulley 31h left ends, it is described from mantle disk
32i top halfs left side edge is set in vertical direction；
The rectangular insert 31e cross sections are rectangle, can only be slided and cannot rotated through the inclination insertion tube 31a,
Therefore the first nut 31g rotations can drive the first screw rod 31f, rectangular insert 31e to advance.
Further, the end that the rectangular insert 31e is contacted with the annular groove 31d is equipped with cushion, the rectangle
Plug 31e squeezes annular groove 31d by cushion, and the cushion causes the adjustable range bigger more line of extrusion stress
Property, it avoids directly squeezing the phenomenon that annular groove 31d causes the gear circular shaft 31c that can not rotate with rectangular insert 31e.
Vertical transmission device 32, including be rotatably located in the nut jack 13b the second nut 32a, with it is described
The second screw rod 32b that second nut 32a is spirally connected and is plugged in the screw insertion 13c, vertically it is located at the second screw rod 32b
/V circular hole is equipped in speed governing the cross bar 32c, the speed governing cross bar 32c of lower section and is rotatably equipped in the /V circular hole
The round outside but spuare inside slip insertion tube 32d in cross section, the vertical transmission device 32, which further includes, is located at the slip insertion tube 32d positioned at tune
Major diameter annulus 32e above fast cross bar 32c, it is located at the path annulus that the slip insertion tube 32d is located at below speed governing cross bar 32c
32f, the rectangle inserted link 32g mating with the slip insertion tube 32d, the rectangle inserted link 32g lower ends are located at and via /V
Cylinder inserted link 32h in the lower rolling chamber 14 of cylinder 14b insertions, the driving pulley 32i for being located at the cylinder inserted link 32h lower ends, institute
State and nut jack 13b is pierced by the left of the second nut 32a is emerging in 11 left side of outer cover body, the major diameter annulus 32e with it is described from
Mantle disk 31i top halfs left side edge is sequentially connected；
The roller eraser 4 includes：
Roller shaft 41 is rotatably plugged in the 14 upper and lower end face of lower rolling chamber；
Cylinder stack shell 42 is located at 41 outer circumferential walls of roller shaft, in lower rolling chamber 14 with one heart；
Bristle outer layer 43, is located at 42 outer circumferential walls of cylinder stack shell, and 43 front of bristle outer layer is emerging in outer cover body 11
Front；
Driven pulley 44 is located in the roller shaft 41, above the cylinder stack shell 42, the driven pulley 44 and institute
Driving pulley 32i is stated to be sequentially connected by conveyer belt.
Specifically used method：
The application method of the portable environmental-protection blackboard eraser comprises the following steps：
Step 1, roller eraser 4 rolls erasing chalk bits：
With hand pressing blackboard eraser its front end face is made to be resisted against on blackboard, 21 front end of drive roller wheel and blackboard driving contact, institute
It states 43 front of bristle outer layer to be resisted against on blackboard, is moved with hand-motion blackboard eraser on blackboard, drive 21 turns of the drive roller wheel
It is dynamic；
The drive roller wheel 21 drives the driving axis 22, drive bevel gear 23 to rotate, and the drive bevel gear 23 acts on
It is rotated described in the driven wheel of differential 31h and then drive from mantle disk 31i, it is described to drive the major diameter annulus from mantle disk 31i
32e, insertion tube 32d, rectangle inserted link 32g, cylinder inserted link 32h, driving pulley 32i rotations are slided, the driving pulley 32i passes through biography
Send band that driven pulley 44 is pulled to rotate and then the roller eraser 4 is driven to rotate, the bristle outer layer 43 rotates and will be described black
Chalk bits erasing on plate；
Step 2,4 velocity of rotation of roller eraser is adjusted：
Rotating the second nut 32a drives the second screw rod 32b, speed governing cross bar 32c vertically to move, the speed governing
Cross bar 32c pulls the slip insertion tube 32d, major diameter annulus 32e, path annulus 32f vertically to move, the major diameter annulus
32e changes along longitudinal direction with the contact position from mantle disk 31i, it is described from mantle disk 31i driving the major diameter annulus
The perimeter change of effective circumference of 32e causes the major diameter annulus 32e, slides insertion tube 32d rotation speed changes, the rectangle inserted link
32g, cylinder inserted link 32h, driving pulley 32i rotation speed changes, and then realize the rotation speed change of the roller eraser 4；
Step 3, blackboard eraser movement damping is adjusted：
It rotates the first nut 31g and drives the first screw rod 31f, rectangular insert 31e movement, adjust the rectangular insert
31e adjusts the rotary resistance of the gear circular shaft 31c to the extruding force of the annular groove 31d, adjusts the driving dress
The 2, rotary resistance of roller eraser 4 is put, adjusts the damping that blackboard eraser moves on blackboard.
Further, the driving pulley 32i outer walls, 44 outer circumferential walls of driven pulley, conveyer belt inner wall are equipped with anti-skid chequer.
Using above-mentioned desirable embodiment according to the invention as enlightenment, by above-mentioned description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property scope is not limited to the content on specification, it is necessary to determine its technical scope according to right.
Claims (2)
1. a kind of portable environmental-protection blackboard eraser, it is characterised in that：Including hand-held housing（1）, driving device（2）, transmission device（3）、
Roller eraser（4）；
The hand-held housing（1）Including：
Outer cover body（11）, cuboid shape；
Upper driving chamber（12）, it is located at the outer cover body（11）Top, the upper driving chamber（12）It is equipped on the left of upper end on screw rod
Hole（12a）, the upper driving chamber（12）Front face open is set；
Middle drive cavity（13）, it is located at the outer cover body（11）Middle part, the middle drive cavity（13）With upper driving chamber（12）Between
Form spacing board（13a）, the upper spacing board（13a）Left side is equipped with nut jack（13b）, the upper spacing board（13a）
Hole on upper and screw rod（12a）Corresponding position is additionally provided with through nut jack（13b）The screw insertion of setting（13c）, the middle transmission
Chamber（13）Right side is equipped with right openings（13d）, the right openings（13d）Upper and lower is respectively equipped with upper and lower limit plate（13e、
13f）, the upper and lower limit plate（13e、13f）It is arranged in parallel and inclined downward to the left；
Lower rolling chamber（14）, it is located at the outer cover body（11）The latter half, the lower rolling chamber（14）With middle drive cavity（13）
Between form lower spacing board（14a）, the lower spacing board（14a）Left side is equipped with connection circular hole and is set above the connection circular hole
There is limiting cylinder（14b）, the lower rolling chamber（14）Front face open is set；
The driving device（2）Including：
Drive roller wheel（21）, rotatably it is located at the upper driving chamber（12）It is interior, the drive roller wheel（21）Front end is emerging in institute
State outer cover body（11）Front；
Drive axis（22）, it is located at the drive roller wheel（21）In the middle part of lower face, the driving axis（22）Between described go up
Partition plate（13a）It is inserted into middle drive cavity（13）It is interior；
Drive bevel gear（23）, it is located at the driving axis（22）Lower section, in shape with wide top and narrow bottom；
The transmission device（3）Including：
Angled drive device（31）, it is located at the middle drive cavity（13）Right side and the inclination insertion tube of lower section extension to the left（31a）, set
In the inclination insertion tube（31a）The compression spring in inner cavity upper right side（31b）, along the inclination insertion tube（31a）Axially it is plugged in institute
State inclination insertion tube（31a）Interior gear circular shaft（31c）, be located at the gear circular shaft（31c）The annular groove of outer wall（31d）, by
Lower section, which passes through, tilts insertion tube（31a）Side wall is simultaneously inserted into the annular groove（31d）Interior rectangular insert（31e）, be located at the square
Shape plug（31e）First screw rod of lower section（31f）And first screw rod（31f）First nut of thread fitting（31g）, institute
State the first nut（31g）Positioned at the upper limit plate（13e）, lower limiting board（13f）Between, first nut（31g）Side
Through the right openings（13d）And it is emerging in outer cover body（11）Right side, the angled drive device（31）It further includes and is located at
Gear circular shaft（31c）Lower-left end and with the drive bevel gear（23）The driven wheel of differential of left margin transmission cooperation（31h）, it is coaxial
It is located at the driven cone pulley（31h）The slave mantle disk of left end（32i）, it is described from mantle disk（32i）Top half left side edge is in
Vertical direction is set；
Vertical transmission device（32）, including being rotatably located at the nut jack（13b）The second interior nut（32a）With institute
State the second nut（32a）It is spirally connected and is plugged in the screw insertion（13c）The second interior screw rod（32b）, be vertically located at described
Two screw rods（32b）The speed governing cross bar of lower section（32c）, the speed governing cross bar（32c）It is interior to be equipped with /V circular hole and justify in the /V
The round outside but spuare inside slip insertion tube in cross section is rotatably equipped in hole（32d）, the vertical transmission device（32）It further includes and is located at
The slip insertion tube（32d）Positioned at speed governing cross bar（32c）The major diameter annulus of top（32e）, be located at the slip insertion tube（32d）Position
In speed governing cross bar（32c）The path annulus of lower section（32f）And the slip insertion tube（32d）Mating rectangle inserted link
（32g）, be located at the rectangle inserted link（32g）Lower end and via limiting cylinder（14b）The lower rolling chamber of insertion（14）Interior cylinder is inserted
Bar（32h）, be located at the cylinder inserted link（32h）The driving pulley of lower end（32i）, second nut（32a）Left side is pierced by spiral shell
Female plug hole（13b）It is emerging in outer cover body（11）Left side, the major diameter annulus（32e）With described from mantle disk（31i）The first half
Left side edge is divided to be sequentially connected；
The roller eraser（4）Including：
Roller shaft（41）, rotatably it is plugged in the lower rolling chamber（14）Upper and lower end face；
Cylinder stack shell（42）, the roller shaft is located at one heart（41）Outer circumferential walls, positioned at lower rolling chamber（14）It is interior；
Bristle outer layer（43）, it is located at the cylinder stack shell（42）Outer circumferential walls, the bristle outer layer（43）Front is emerging in shell
Body（11）Front；
Driven pulley（44）, it is located at the roller shaft（41）On, positioned at the cylinder stack shell（42）Top, the driven pulley
（44）With the driving pulley（32i）It is sequentially connected by conveyer belt.
2. a kind of portable environmental-protection blackboard eraser according to claim 1, it is characterised in that：The driving pulley（32i）Outer wall,
Driven pulley（44）Outer circumferential walls, conveyer belt inner wall are equipped with anti-skid chequer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711410376.XA CN108045135A (en) | 2017-12-23 | 2017-12-23 | A kind of portable environmental-protection blackboard eraser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711410376.XA CN108045135A (en) | 2017-12-23 | 2017-12-23 | A kind of portable environmental-protection blackboard eraser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108045135A true CN108045135A (en) | 2018-05-18 |
Family
ID=62130656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711410376.XA Pending CN108045135A (en) | 2017-12-23 | 2017-12-23 | A kind of portable environmental-protection blackboard eraser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108045135A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2043923U (en) * | 1989-01-28 | 1989-09-06 | 谭世榆 | Friction chalk powder absorbing eraser without power source |
| CN2108633U (en) * | 1991-01-24 | 1992-07-01 | 崔红 | Eraser with collecting dust function |
| CN2160555Y (en) * | 1993-06-29 | 1994-04-06 | 宁春刚 | Dust-free blackboard eraser |
| JPH09118100A (en) * | 1995-10-25 | 1997-05-06 | Ricoh Elemex Corp | Writing board |
| CN2557341Y (en) * | 2002-07-09 | 2003-06-25 | 张越 | Blackboard eraser |
| CN2609775Y (en) * | 2002-05-13 | 2004-04-07 | 蒋东东 | Electric environmental protection energy-saving eraser |
| CN101987552A (en) * | 2009-07-31 | 2011-03-23 | 海安县商业学校 | Automatic blackboard eraser |
-
2017
- 2017-12-23 CN CN201711410376.XA patent/CN108045135A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2043923U (en) * | 1989-01-28 | 1989-09-06 | 谭世榆 | Friction chalk powder absorbing eraser without power source |
| CN2108633U (en) * | 1991-01-24 | 1992-07-01 | 崔红 | Eraser with collecting dust function |
| CN2160555Y (en) * | 1993-06-29 | 1994-04-06 | 宁春刚 | Dust-free blackboard eraser |
| JPH09118100A (en) * | 1995-10-25 | 1997-05-06 | Ricoh Elemex Corp | Writing board |
| CN2609775Y (en) * | 2002-05-13 | 2004-04-07 | 蒋东东 | Electric environmental protection energy-saving eraser |
| CN2557341Y (en) * | 2002-07-09 | 2003-06-25 | 张越 | Blackboard eraser |
| CN101987552A (en) * | 2009-07-31 | 2011-03-23 | 海安县商业学校 | Automatic blackboard eraser |
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Application publication date: 20180518 |
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| RJ01 | Rejection of invention patent application after publication |