CN2855772Y - Environmental protection type chalk-dust free black-board - Google Patents
Environmental protection type chalk-dust free black-board Download PDFInfo
- Publication number
- CN2855772Y CN2855772Y CN 200520125399 CN200520125399U CN2855772Y CN 2855772 Y CN2855772 Y CN 2855772Y CN 200520125399 CN200520125399 CN 200520125399 CN 200520125399 U CN200520125399 U CN 200520125399U CN 2855772 Y CN2855772 Y CN 2855772Y
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- blackboard
- fore shell
- cloth
- environmental
- brush
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Abstract
The utility model discloses a environmental protection non-chalk-powder blackboard, comprising a front shell, a bottom board, a blackboard cloth, a principal transmission shaft transmitted by a motor, a motor, a controlling circuit that can drive the motor to run, a liner, a blackboard brush, a plurality of driven shafts and a tensioning mechanism. The blackboard cloth can be made to move in cycle by the effects that the motor drives the shaft and that the shaft drives the blackboard cloth arranged in a ring shape. As the blackboard brush is arranged on the back side of the blackboard cloth, the blackboard surface written with characters that rotates from the front side can be brushed clean, which makes the brushing process carried out inside the front shell. In this way, the time of brushing the blackboard is saved and the pollution on the environment caused by the chalk powder is also prevented so that the chalk powder is avoided to be breathed in by the user under the blackboard, which effectively achieves the aim of eliminating the chalk powder. Meanwhile, the utility model has characteristics of simple structure, convenient installation, lower cost and convenient usage.
Description
Technical field
The utility model relates to a kind of writing device, particularly relates to a kind of environmental-friendly dust-free blackboard.
Background technology
Blackboard is a kind of writing appliance commonly used in the teaching, traditional blackboard is directly to be produced on the body of wall, but because the height of blackboard is fixed, be difficult to adapt to the user of different heights, therefore, blackboard is transformed into structure moving up and down, the blackboard of this structure is to be manufactured with framework on body of wall, before framework is provided with, two tracks in back, preceding, a blackboard respectively is installed in the back track, before, back blackboard can be in track separately on, move down, fixed pulley then is equipped with on the top of framework, the two ends of steel wire tightrope then by fixed pulley respectively with preceding, back blackboard Joint, before can being carried out, go up by two blackboards moving under the back or on the preceding back down, like this, expanded on the one hand the write area of blackboard greatly, also can be adapted to the user of different heights on the other hand by moving up and down blackboard.Yet, no matter be fixed blackboard, or blackboard moving up and down, all exist the phenomenon that dust wafts when erasing the board, become serious dust pollution source, these dust can be inhaled into teachers and students' respiratory system along with air, cause the disease of respiratory system, be teacher particularly for the writer, just stand under the blackboard, and say and class hour need bigger respiratory capacity again, the dust of suction is also maximum, thereby, teacher healthy caused great harm.
The utility model content
The purpose of this utility model is to overcome the deficiency of prior art, and a kind of environmental-friendly dust-free blackboard is provided, and can effectively eliminate the pollution of dust, has avoided the suction of teachers and students to dust, simultaneously, has characteristics simple in structure, easy for installation, that cost is low, easy to use.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of environmental-friendly dust-free blackboard, but it comprises fore shell, base plate, blackboard cloth, the control circuit by the final drive shaft of motor transmission, the running of motor drive motors, liner plate, blackboard brush, some driven spindle and strainer; Four jiaos of base plate are provided with installing hole; One side of fore shell and a side of base plate are articulated, and the opposite side that the opposite side of fore shell and base plate are corresponding is removable clamping mutually; Side in the fore shell is equipped with final drive shaft, and final drive shaft is meshed with motor shaft by gear, and the opposite side in the fore shell is equipped with first driven spindle; Blackboard cloth is wound between the final drive shaft and first driven spindle in the form of a ring and is divided into the preceding cloth body and the back cloth body of running transform capable of circulation, have the perforate of the front surface of cloth body before being used to expose on fore shell, liner plate is fixed in the fore shell and abuts in the rear surface of preceding cloth body; Blackboard brush is vertical shape and is installed in up and down between the inwall and be close to the rear surface of back cloth body of fore shell, is provided with second driven spindle that is used for stretching blackboard cloth on the one side or the both sides of blackboard brush; Be made as mesh in the fore shell bottom that blackboard brush is housed, but the dust collection box of pull is housed under the mesh; Strainer is contained between back cloth body and the fore shell madial wall.
Described strainer comprises and is used to change the 3rd driven spindle of blackboard cloth moving direction, the 4th driven spindle and the extension spring that can move freely, the 3rd driven spindle is fixed in the fore shell, the two ends of the 4th driven spindle respectively with an end Joint of two extension springs, the other end of two extension springs is fixed in fore shell madial wall place.
Described fore shell is provided with the bottom of mesh along laterally being provided with two slide rails, and dust collection is box-packed in slide rail.
Being articulated of described fore shell one side and base plate one side is hinged by hinge and base plate one side for fore shell one side.
Also be connected with some laths behind the described liner plate, the upper and lower side of lath respectively with the Joint of inwall up and down of fore shell.
Described blackboard brush is three, and three blackboard brush are vertical shape respectively and are installed in up and down between the inwall and be close to the rear surface of back cloth body of fore shell, are provided with some second driven spindles that are used for stretching blackboard cloth on the one side or the both sides of blackboard brush.
Described environmental-friendly dust-free blackboard also comprises manual backup is housed, described manual backup comprises stay cord, sprocket wheel, cone pulley group, gear drive, gear drive is meshed with final drive shaft, gear drive joins by driving-belt and cone pulley group, cone pulley group and sprocket wheel join, and stay cord is contained on the sprocket wheel.
Described environmental-friendly dust-free blackboard also comprises manual setter is housed, and described manual setter comprises rotary handle and worm gear, worm screw, and rotary handle links by worm gear, worm screw and final drive shaft.
Described environmental-friendly dust-free blackboard also includes remote controller and signal receiving module, and signal receiving module is contained in the fore shell place, and the output of signal receiving module is connected to control circuit, and the output of control circuit is connected to motor.
Also be provided with sealing gasket between described fore shell and the base plate, sealing gasket is the rear wall place that shaped as frame is bonded in fore shell.
Environmental-friendly dust-free blackboard of the present utility model, can adopt the mode of switch control that blackboard cloth is moved, switch then is installed on the fore shell, also can adopt the mode of remote control that blackboard cloth is moved, and the emission of remote control and reception can adopt infrared mode also can adopt RF-wise.
Environmental-friendly dust-free blackboard of the present utility model, blackboard brush is installed in up and down between the inwall of fore shell with being convenient assembling, multiple mode all can such as adopting that screw is fixed or connected and fixed etc., like this, facilitate and change blackboard brush or the dust on the blackboard brush is removed, removing dust on the blackboard brush also can adopt and scavenge unit is installed on blackboard brush is realized, such as a cotton rope that can move up and down along brush finish is installed, the dust that adheres in the brush finish can be disposed by moving up and down also of cotton rope.
During use, the installing hole by four jiaos of base plates can be installed in the utility model on the body of wall, for the user of differing heights, blackboard can be installed on the position of differing heights.Between the fore shell and base plate of blackboard, by removable interface arrangment, one gusset that can make fore shell rotates around the opposite side that is articulated with base plate, like this, just can open fore shell, be convenient to parts such as the blackboard cloth installed in the fore shell, blackboard brush are changed, aforesaid removable interface arrangment, adopt normally used interface arrangment to get final product, such as, can realize blocking mutually by the protruding lip between the two-phase clamping object.Be provided with perforate at fore shell of the present utility model, perforate makes blackboard cloth expose the formation writing surface, liner plate is equipped with in the back that in the back of preceding cloth body also is writing surface, liner plate forms blackboard cloth and supports, like this, just can on the front surface of preceding cloth body, write, in the time of need changing writing surface in addition when having write full content on the writing surface, at this moment, need not carry out wiping to writing surface with blackboard eraser, can be by the mode of Rotary Blackboard cloth, new writing surface is exposed, old writing surface then changes into, push the switch on the fore shell, power supply is access in, setting by control circuit, motor rotates and makes blackboard cloth move a writing surface, blackboard cloth mobile is to utilize the friction between itself and the final drive shaft and driven, because blackboard cloth is by the tensioning of spring institute, therefore, when final drive shaft rotates under driven by motor, final drive shaft can drive blackboard cloth again and move, first driven spindle and final drive shaft can make blackboard cloth abut on the liner plate and move, the effect of second driven spindle is to make blackboard brush can be close on the blackboard cloth, when blackboard cloth moves, the writing of writing surface can be wiped, blackboard cloth is to be installed in the form of a ring between first driven spindle and the final drive shaft, and blackboard cloth is during as preceding cloth body, and its front surface promptly is a writing surface, when blackboard cloth turns to rear side and when becoming back cloth body, its rear surface promptly is a writing surface, and blackboard cloth is in the preceding cloth body of then formation of front side in moving process, be in cloth body after the then formation of rear side, in the use, preceding cloth body is the writing surface that is using, and back cloth body then is to be in the writing surface that is wiped free of writing.Because blackboard brush is to carry out in the chamber that fore shell and base plate surround in brushing the process of writing, and also have sealing gasket to prevent that dust from spilling between fore shell and the base plate, therefore, dust can be outwards not elegant, simultaneously also need not manually-operated, saved the time that erases the board, like this, dust just can not sucked by human body, has reached the effect of dustless use.Be made as mesh in the fore shell bottom that blackboard brush is installed, but the dust collection box of pull is housed under the mesh, blackboard brush is when wiping writing, dust can drop to the bottom surface in the fore shell, because the bottom surface is made as mesh, dust will drop in the dust collection box, in use for some time by mesh, can pull out the dust collection box, the dust of heaping is cleaned out.
The utility model also can comprise being provided with manual backup or manual setter do not having under the situation of power supply except adopting Electric Machine Control, just can blackboard cloth be moved by manual backup or manual setter.
The all right straighforward operation of the utility model, at this moment, need increase in fore shell is equipped with receiver module and gets final product, and like this, just can control by remote controller.
The beneficial effects of the utility model are, owing to adopted fore shell, base plate, blackboard cloth, final drive shaft by the motor transmission, motor, but the control circuit of drive motors running, liner plate, blackboard brush, some driven spindles and strainer constitute the environmental-friendly dust-free blackboard, utilize the drive of motor countershaft and rotating shaft drive to the blackboard cloth installed in the form of a ring, it is mobile that blackboard cloth can be circulated, then, blackboard brush realizes wiping of the blackboard surface of writing writing that the front side is transferred at the rear side of blackboard cloth by being installed, the process of wiping blackboard is carried out in fore shell, both saved the time that erases the board, prevented to wipe in the blackboard process dust again to the pollution of environment, avoided that the user sucks dust under the blackboard, reached the purpose of effective elimination dust pollution, simultaneously, also have simple in structure, easy for installation, cost is low, characteristics easy to use.
Description of drawings
Below in conjunction with drawings and Examples the utility model is described in further detail; But a kind of environmental-friendly dust-free blackboard of the present utility model is not limited to embodiment.
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is the cutaway view along A-A line among Fig. 1;
Fig. 3 is the structural representation of another embodiment of the utility model.
The specific embodiment
Referring to Fig. 1, shown in Figure 2, a kind of environmental-friendly dust-free blackboard of the present utility model, but it comprises fore shell 1, base plate 2, blackboard cloth 3, the control circuit by the final drive shaft 4 of motor transmission, the running of motor 5 drive motors, liner plate 6, blackboard brush 7, some driven spindle and strainer.
Four jiaos of base plate 2 are provided with installing hole 21;
One side of fore shell 1 and a side of base plate 2 are articulated, the opposite side of fore shell 1 and base plate 2 corresponding opposite sides are removable clamping mutually, being articulated of fore shell and base plate can be hinged by hinge 22 and base plate 2 one sides for fore shell 1 one sides, and removable interface arrangment can adopt normally used interface arrangment to get final product, such as, can realize blocking mutually by the protruding lip between the two-phase clamping object; Between fore shell 1 and base plate 2, also be provided with the sealing gasket (not shown), sealing gasket is the rear wall place that shaped as frame is bonded in fore shell 1, when fore shell 1 and base plate 2 mutually during clamping, fore shell 1 all has sealing gasket with the touching position of base plate 2, makes the inner chamber that is surrounded by fore shell 1 and base plate 2 be the sealing shape.
Side in the fore shell 1 is equipped with final drive shaft 4, and final drive shaft 4 is meshed by 5 in gear (not shown) and motor, and the opposite side in the fore shell 1 is equipped with first driven spindle 41; Blackboard cloth 3 is wound between the final drive shaft 4 and first driven spindle 41 in the form of a ring and is divided into the preceding cloth body 31 and the back cloth body 32 of running transform capable of circulation;
On fore shell 1, have the perforate 11 of the front surface of cloth body 31 before being used to expose, liner plate 6 is fixed in the fore shell 1 and abuts in the rear surface of preceding cloth body 31, fixedly during liner plate 6, be behind liner plate 6, to be connected with some laths 61, the upper and lower side of lath 61 respectively with the Joint of inwall up and down of fore shell 1; Blackboard brush 7 is three, and three blackboard brush 7 are vertical shape respectively and are installed in up and down between the inwall and be close to the rear surface of back cloth body 32 of fore shell 1, are provided with three second driven spindles 42 that are used for stretching blackboard cloth 3 on the one side or the both sides of blackboard brush 7; The dust collection box 13 of pull is equipped be made as mesh 12 in fore shell 1 bottom that blackboard brush 7 is housed, but mesh for 12 times; Blackboard brush 7 is to be installed in up and down between the inwall of fore shell 1 with being convenient assembling, multiple mode all can such as adopting that screw is fixed or connected and fixed etc., like this, facilitate and change blackboard brush or the dust on the blackboard brush is removed, removing dust on the blackboard brush 7 also can adopt and scavenge unit is installed on blackboard brush 7 is realized, such as a cotton rope that can move up and down along brush finish is installed, the dust that adheres in the brush finish can be disposed by moving up and down also of cotton rope.
Strainer is contained between back cloth body 32 and fore shell 1 madial wall, strainer comprises and is used to change the 3rd driven spindle 43 of blackboard cloth moving direction, the 4th driven spindle 44 and the extension spring 45 that can move freely, the 3rd driven spindle 43 is fixed in the fore shell 1, the two ends of the 4th driven spindle 44 respectively with an end Joint of two extension springs 45, the other end of two extension springs 45 is fixed in fore shell 1 madial wall place; The bottom that is provided with mesh 12 at fore shell 1 is along laterally being provided with two slide rails 14, and dust collection box 13 is contained in the slide rail 14.
During use, the installing hole 21 by 2 four jiaos of base plates can be installed in the utility model on the body of wall, for the user of differing heights, blackboard can be installed on the position of differing heights.Between the fore shell 1 and base plate 2 of blackboard, by removable interface arrangment, one gusset that can make fore shell 1 rotates around the opposite side that is articulated with base plate 2, like this, just can open fore shell 1, be convenient to parts such as the fore shell 1 interior blackboard cloth of installing 3, blackboard brush 7 are changed, this removable interface arrangment, adopt normally used interface arrangment to get final product, such as, can realize blocking mutually by the protruding lip between the two-phase clamping object.Be provided with perforate 11 at fore shell 1 of the present utility model, perforate 11 makes blackboard cloth 3 expose the formation writing surface, liner plate 6 is equipped with in the back that in the back of preceding cloth body 31 also is writing surface, 6 pairs of blackboard cloth of liner plate 3 form and support, like this, just can on the front surface of preceding cloth body 31, write, in the time of need changing writing surface in addition when having write full content on the writing surface, at this moment, need not carry out wiping to writing surface with blackboard eraser, can be by the mode of Rotary Blackboard cloth 3, new writing surface is exposed, old writing surface then changes into, push the switch 15 on the fore shell 1, power supply is access in, setting by control circuit, motor 5 rotates and makes blackboard cloth 3 move a writing surface, blackboard cloth 3 mobile is to utilize the friction between itself and the final drive shaft 4 and driven, because blackboard cloth 3 is by 45 tensionings of spring, therefore, when final drive shaft 4 rotates under motor 5 drives, final drive shaft 4 can drive blackboard cloth 3 again and move, first driven spindle 41 can make blackboard cloth 3 abut on the liner plate 6 with final drive shaft 4 and move, the effect of second driven spindle 42 is to make blackboard brush can be close on the blackboard cloth 3, when blackboard cloth 3 moves, the writing of writing surface can be wiped, blackboard cloth 3 is to be installed in the form of a ring between first driven spindle 41 and the final drive shaft 4, and blackboard cloth 3 is during as preceding cloth body 31, and its front surface promptly is a writing surface, when blackboard cloth 3 turns to rear side and when becoming back cloth body 32, its rear surface promptly is a writing surface, and blackboard cloth 3 is in the preceding cloth body 31 of then formation of front side in moving process, be in cloth body 32 after the then formation of rear side, in the use, preceding cloth body 31 is the writing surfaces that using, and 32 of back cloth bodies are to be in the writing surface that is wiped free of writing.Because blackboard brush 7 is to carry out in the chamber that fore shell 1 and base plate 2 surround in brushing the process of writing, therefore, dust can be outwards not elegant, simultaneously also need not manually-operated, and like this, dust just can not sucked by human body, has reached the effect of dustless use.Be made as mesh 12 in fore shell 1 bottom that blackboard brush is installed, but mesh is equipped with the dust collection box 13 of pull for 12 times, blackboard brush 7 is when wiping writing, dust can drop to the bottom surface in the fore shell 1, because the bottom surface is made as mesh 12, dust will drop in the dust collection box 13, in use for some time by mesh 12, can pull out dust collection box 13, the dust of heaping is cleaned out.
Fig. 3 is the schematic diagram of the another kind of example structure of the utility model, it also comprises is equipped with manual backup, utilize manual backup to be used as hand gear of the present utility model, described manual backup comprises stay cord 51, sprocket wheel 52, cone pulley group 53, gear drive (not shown), gear drive is meshed with final drive shaft 4, gear drive joins by driving-belt 54 and cone pulley group 53, and cone pulley group 53 is joined with sprocket wheel 52, and stay cord 51 is contained on the sprocket wheel 52.Do not having under the situation of power supply, just can blackboard cloth moved by manual backup.After stay cord 51 is pulled, stay cord 51 rotates sprocket wheel 52, the rotation of sprocket wheel 52 has then driven the rotation of cone pulley group 53, cone pulley group 53 has driven moving of driving-belt 54, driving-belt 54 has driven the gear drive action again, gear drive makes final drive shaft 4 rotate again, thereby has driven moving of blackboard cloth 3, makes writing surface be transferred to rear side in time and is wiped.
Hand gear of the present utility model also can be a manual setter, and manual setter comprises rotary handle and worm gear, worm screw, and rotary handle links by worm gear, worm screw and final drive shaft.
Hand gear can also be a rocking handle, and rocking handle directly is contained on the final drive shaft, rotates by rocking handle final drive shaft is also rotated, thereby has driven moving of blackboard cloth, makes writing surface be transferred to rear side in time and is wiped.
Environmental-friendly dust-free blackboard of the present utility model can also include remote controller and signal receiving module, and signal receiving module is contained in the fore shell place, and the output of signal receiving module is connected to control circuit, and the output of control circuit is connected to motor.When signal receiving module was housed, the utility model can adopt the mode of switch control that blackboard cloth is moved, switch is mounted on the fore shell, also can adopt the mode of remote control that blackboard cloth is moved, and the emission of remote control and reception, infrared mode can be adopted, also RF-wise can be adopted.
Claims (9)
1. environmental-friendly dust-free blackboard is characterized in that: but it comprises fore shell, base plate, blackboard cloth, the control circuit by the final drive shaft of motor transmission, the running of motor drive motors, liner plate, blackboard brush, some driven spindle and strainer; Four jiaos of base plate are provided with installing hole; One side of fore shell and a side of base plate are articulated, and the opposite side that the opposite side of fore shell and base plate are corresponding is removable clamping mutually; Side in the fore shell is equipped with final drive shaft, and final drive shaft is meshed with motor shaft by gear, and the opposite side in the fore shell is equipped with first driven spindle; Blackboard cloth is wound between the final drive shaft and first driven spindle in the form of a ring and is divided into the preceding cloth body and the back cloth body of running transform capable of circulation, have the perforate of the front surface of cloth body before being used to expose on fore shell, liner plate is fixed in the fore shell and abuts in the rear surface of preceding cloth body; Blackboard brush is vertical shape and is installed in up and down between the inwall and be close to the rear surface of back cloth body of fore shell, is provided with second driven spindle that is used for stretching blackboard cloth on the one side or the both sides of blackboard brush; Be made as mesh in the fore shell bottom that blackboard brush is housed, but the dust collection box of pull is housed under the mesh; Strainer is contained between back cloth body and the fore shell madial wall.
2. a kind of environmental-friendly dust-free blackboard according to claim 1, it is characterized in that: described strainer comprises and is used to change the 3rd driven spindle of blackboard cloth moving direction, the 4th driven spindle and the extension spring that can move freely, the 3rd driven spindle is fixed in the fore shell, the two ends of the 4th driven spindle respectively with an end Joint of two extension springs, the other end of two extension springs is fixed in fore shell madial wall place.
3. a kind of environmental-friendly dust-free blackboard according to claim 1 is characterized in that: described fore shell is provided with the bottom of mesh along laterally being provided with two slide rails, and dust collection is box-packed in slide rail.
4. a kind of environmental-friendly dust-free blackboard according to claim 1 is characterized in that: being articulated of described fore shell one side and base plate one side is hinged by hinge and base plate one side for fore shell one side.
5. a kind of environmental-friendly dust-free blackboard according to claim 1 is characterized in that: also be provided with sealing gasket between described fore shell and the base plate, sealing gasket is the rear wall place that shaped as frame is bonded in fore shell.
6. a kind of environmental-friendly dust-free blackboard according to claim 1 is characterized in that: also be connected with some laths behind the described liner plate, the upper and lower side of lath respectively with the Joint of inwall up and down of fore shell.
7. a kind of environmental-friendly dust-free blackboard according to claim 1, it is characterized in that: described blackboard brush is three, three blackboard brush are vertical shape respectively and are installed in up and down between the inwall and be close to the rear surface of back cloth body of fore shell, are provided with some second driven spindles that are used for stretching blackboard cloth on the one side or the both sides of blackboard brush.
8. a kind of environmental-friendly dust-free blackboard according to claim 1, it is characterized in that: described environmental-friendly dust-free blackboard also comprises manual setter is housed, described manual setter comprises rotary handle and worm gear, worm screw, and rotary handle links by worm gear, worm screw and final drive shaft.
9. a kind of environmental-friendly dust-free blackboard according to claim 1, it is characterized in that: described environmental-friendly dust-free blackboard also includes remote controller and signal receiving module, signal receiving module is contained in the fore shell place, and the output of signal receiving module is connected to control circuit, and the output of control circuit is connected to motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520125399 CN2855772Y (en) | 2005-11-30 | 2005-11-30 | Environmental protection type chalk-dust free black-board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520125399 CN2855772Y (en) | 2005-11-30 | 2005-11-30 | Environmental protection type chalk-dust free black-board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2855772Y true CN2855772Y (en) | 2007-01-10 |
Family
ID=37599078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520125399 Expired - Fee Related CN2855772Y (en) | 2005-11-30 | 2005-11-30 | Environmental protection type chalk-dust free black-board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2855772Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102350905A (en) * | 2011-09-07 | 2012-02-15 | 金华职业技术学院 | Circulating self-erasing blackboard |
| CN102950939A (en) * | 2012-11-08 | 2013-03-06 | 西安石油大学 | Ten-thousand-time water writing brush writing counter |
| CN103496269A (en) * | 2013-09-22 | 2014-01-08 | 重庆科技学院 | Electric blackboard |
| CN103754023A (en) * | 2014-01-10 | 2014-04-30 | 上海理工大学 | Auto-erase chalkboard of water-writing cloth |
| CN108749406A (en) * | 2018-05-24 | 2018-11-06 | 衢州学院 | A kind of board of education of English teaching |
-
2005
- 2005-11-30 CN CN 200520125399 patent/CN2855772Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102350905A (en) * | 2011-09-07 | 2012-02-15 | 金华职业技术学院 | Circulating self-erasing blackboard |
| CN102950939A (en) * | 2012-11-08 | 2013-03-06 | 西安石油大学 | Ten-thousand-time water writing brush writing counter |
| CN102950939B (en) * | 2012-11-08 | 2014-12-10 | 西安石油大学 | Ten-thousand-time water writing brush writing counter |
| CN103496269A (en) * | 2013-09-22 | 2014-01-08 | 重庆科技学院 | Electric blackboard |
| CN103754023A (en) * | 2014-01-10 | 2014-04-30 | 上海理工大学 | Auto-erase chalkboard of water-writing cloth |
| CN103754023B (en) * | 2014-01-10 | 2015-07-22 | 上海理工大学 | Auto-erase chalkboard of water-writing cloth |
| CN108749406A (en) * | 2018-05-24 | 2018-11-06 | 衢州学院 | A kind of board of education of English teaching |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070110 Termination date: 20091230 |