CN109605995A - A kind of teaching dust arrester installation having rotary adjustment structure - Google Patents

A kind of teaching dust arrester installation having rotary adjustment structure Download PDF

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Publication number
CN109605995A
CN109605995A CN201811391886.1A CN201811391886A CN109605995A CN 109605995 A CN109605995 A CN 109605995A CN 201811391886 A CN201811391886 A CN 201811391886A CN 109605995 A CN109605995 A CN 109605995A
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CN
China
Prior art keywords
main body
chalk
dust
adjustment structure
head
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Pending
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CN201811391886.1A
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Chinese (zh)
Inventor
王晨娣
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201811391886.1A priority Critical patent/CN109605995A/en
Publication of CN109605995A publication Critical patent/CN109605995A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B43WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43LARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L21/00Blackboard or slate cleaning devices
    • B43L21/02Blackboard or slate cleaning devices with means for absorbing the chalk dust

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  • Cleaning In General (AREA)

Abstract

The invention discloses a kind of teaching dust arrester installations for having rotary adjustment structure, head is adjusted including rotation, the rotation adjusts the left end that head is connected to main body, and the upper surface of main body is provided with sliding slot, sliding block is connected in the sliding slot, and sliding block is set on bracket, the lower surface of the main body is provided with suction inlet, and the lower surface of main body is equipped with button cell box, exhaust area is provided on the outside of the right end of the main body, and the right end of main body is connected with dust tail bottle, the bracket is set between main body and chalk sleeve, and chalk sleeve is set to the inside of main body.The teaching for having rotary adjustment structure can take chalk with dust arrester installation by way of rotation; it avoids and takes chalk by way of promotion in the past; the problem of so as to avoid chalk frangibility; and it can be after absorbing the chalk dust that chalk-writing generates; chalk dust is pressed into chalk; in order to avoid chalk dust is flown upward when handling chalk dust, be conducive to protect environment.

Description

A kind of teaching dust arrester installation having rotary adjustment structure
Technical field
The present invention relates to teaching correlative technology field, specially a kind of teaching for having rotary adjustment structure dresses that gathers dust It sets.
Background technique
It is well known that chalk write when, inevitably generate chalk dust, due to chalk ash particle is smaller and compared with Gently, it is very easy to fly upward in air, this is fine not only bad for environment, and is easy pollution and teaches indoor environment, and be also easy Lung is sucked by teacher and front-seat classmate, to have an impact to the health of teacher and front-seat student, dust arrester installation is used in teaching The device of exactly a kind of chalk dust to wave when can collect chalk-writing.
But existing teaching is still had several drawbacks with dust arrester installation, and such as publication number: CN106218272B, publication date: 20171222, disclosed teaching dust arrester installation, there is also some problems below:
1), its dust arrester installation is separated with chalk clamping device, when this makes chalk-writing, the dust of generation, cannot timely by It absorbs, to influence to teach indoor teaching environment;
2), its chalk clamp structure clamps chalk by multiple shape of threads silica gel, and the mobile powder by the way of pushing Pen, will be so that the clamp structure global failure after this requires the length of clamp structure, and screw rod deforms accidentally;
3), its chalk dust absorbed is absorbed by spraying form, this not only makes dust be easy to be attached on device Inside, and waste water resource.
Summary of the invention
It is above-mentioned to solve the purpose of the present invention is to provide a kind of teaching dust arrester installation for having rotary adjustment structure It is proposed that existing teaching cannot absorb chalk dust with dust arrester installation in time in background technique, and clamp structure is not convenient to use and inhales The chalk dust of receipts is not easy to the problem of processing.
To achieve the above object, the invention provides the following technical scheme: a kind of teaching for having rotary adjustment structure is used Dust arrester installation, including rotation adjust head, and the rotation adjusts the left end that head is connected to main body, and the upper surface of main body is provided with cunning Slot is connected with sliding block in the sliding slot, and sliding block is set on bracket, and the lower surface of the main body is provided with suction inlet, and main The lower surface of body is equipped with button cell box, is provided with exhaust area on the outside of the right end of the main body, and the right end of main body is connected with Dust tail bottle, the bracket are set between main body and chalk sleeve, and chalk sleeve is set to the inside of main body, the chalk sleeve Right end is equipped with blower, and is connected on the inside of the outside of blower and main body, and be provided with filter paper on the inside of main body right end, institute State the linkage gear that is internally provided with of main body, and main body is internally connected with supporting block, and ball is provided in the supporting block, and Be mounted with driven torus on ball, be connected with driven internal helical gear on the driven torus, and driven internal helical gear by support rod with Main body is connected, and support tube is connected on the outside of the driven internal helical gear, and support tube passes through compressed spring and link block phase Connection, and compressed spring is set to the inside of support tube, and the outer end of the link block is provided with pushing head.
Preferably, the inside that the rotation adjusts head is connected by the way of engagement with linkage gear, and linkage gear It is equal angular to be distributed in main body, and rotate adjusting head and be connected by the way of bearing connection with main body, while rotating tune The planform of section header is truncated cone-shaped, and the outer end that rotation adjusts head is rubber material.
Preferably, hole is uniformly distributed on the exhaust area, and the position of exhaust area is corresponding with the position of filter paper, And the inside of exhaust area and filter paper are seamlessly connected.
Preferably, the dust tail bottle is connected by the way of being threadedly coupled with main body, and the maximum of dust tail bottle is outer Diameter is identical as the outer diameter of main body.
Preferably, the right end of the bracket runs through blower, and the right end of bracket is connected on pressing plate, and bracket and blower For seamless connection.
Preferably, the planform of the pressing plate is cone, and the axis of pressing plate is overlapped with the axis of dust tail bottle.
Preferably, the equal angular outside for being nested in driven torus of the driven internal helical gear, and driven internal helical gear is interior Side is connected by the way of engagement with driven torus, and the outside of driven torus is connected by the way of engagement with linkage gear It connects, while the connection type of driven torus and supporting block is identical as the connection type of sliding block and sliding slot.
Preferably, the equal angular outside for being connected to driven internal helical gear of the support tube, and support tube is using nesting Mode is connected with link block, and the pushing head of link block upper end is the truncated cone-shaped of rubber material.
Preferably, the planform of the support rod be " V " font, and support rod using bearing connect by the way of with it is driven The both ends of internal helical gear are connected.
Compared with prior art, the beneficial effects of the present invention are: the teaching dress that gathers dust for having rotary adjustment structure Chalk can be taken by way of rotation by setting, and avoided and taken chalk by way of promotion in the past, easy so as to avoid chalk The problem of fractureing, and chalk dust can be pressed into chalk after absorbing the chalk dust that chalk-writing generates, in order to avoid in processing chalk When grey, chalk dust is flown upward, and is conducive to protect environment;
1, rotation adjusts the setting of head, linkage gear, driven torus, driven internal helical gear, support tube, link block and compressed spring, Linkage gear, driven torus and driven internal helical gear can be driven to rotate simultaneously, and then can to connect convenient for adjusting head by rotation The pushing head rotation connected on block is conducive to squeeze chalk by pushing head, chalk is squeezed out chalk sleeve or gets into chalk sleeve It is interior, so that can be in such a way that similar finger directly pinches chalk using chalk, avoid chalk makes on dust arrester installation The problem of with frangibility, while the setting of compressed spring, are able to satisfy the requirement of chalk hexagonal prism shape, and the clamping knot Structure is highly stable, can increase the service life of the device;
2, the setting of suction inlet, blower, exhaust area and filter paper, the chalk dust which is generated when absorbing chalk-writing, Teacher is avoided that when writing, inhalation of chalk dust is conducive to the health and good environment of protecting teacher, meanwhile, by dust suction knot Structure is arranged in device noumenon, can carry, and can absorb in time its dust to wave while chalk-writing, avoid convenient for teacher Previous dust arrester installation due to its dust absorbing structure with clamping chalk position separate, influence the effect of dust suction;
3, the setting of sliding slot, sliding block, bracket and pressing plate, can be convenient for squeezing the chalk dust in dust tail bottle, so as to by dust tail Chalk dust in bottle is squeezed into muffin, is conducive to post-processing, in order to avoid chalk dust is flown upward when post-processing, is conducive to the beautification of the environment It is good, and the pressing plate of cone, it is avoided that dust is accumulated on it.
Detailed description of the invention
Fig. 1 is overlooking structure diagram of the present invention;
Fig. 2 is present invention looks up structural representation of the present invention;
Fig. 3 is main body schematic cross-sectional view of the present invention;
Fig. 4 is that present invention rotation adjusts head and main body side section attachment structure schematic diagram;
Fig. 5 is A point enlarged structure schematic diagram in Fig. 4 of the present invention;
Fig. 6 is this hair support tube and pushing head attachment structure schematic diagram;
Fig. 7 is driven torus of the present invention and supporting block attachment structure schematic diagram;
Fig. 8 is the driven internal helical gear side structure schematic view of the present invention.
In figure: 1, rotation adjusts head;2, main body;3, sliding slot;4, sliding block;5, exhaust area;6, dust tail bottle;7, suction inlet; 8, button cell box;9, blower;10, bracket;11, pressing plate;12, filter paper;13, linkage gear;14, driven torus;15, supporting block; 16, driven internal helical gear;17, support tube;18, link block;19, head is pushed;20, support rod;21, compressed spring;22, ball; 23, chalk sleeve.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
Please refer to Fig. 1-8, the present invention provides a kind of technical solution: a kind of teaching having rotary adjustment structure is with gathering dust Device, including rotation adjust head 1, and rotation adjusts the left end that head 1 is connected to main body 2, and the upper surface of main body 2 is provided with sliding slot 3, Sliding block 4 being connected in sliding slot 3, and sliding block 4 is set on bracket 10, the lower surface of main body 2 is provided with suction inlet 7, and main body 2 Lower surface is equipped with button cell box 8, is provided with exhaust area 5 on the outside of the right end of main body 2, and the right end of main body 2 is connected with dust Tail bottle 6, bracket 10 are set between main body 2 and chalk sleeve 23, and chalk sleeve 23 is set to the inside of main body 2, chalk sleeve 23 Right end is equipped with blower 9, and the outside of blower 9 is connected with the inside of main body 2, and is provided with filter on the inside of 2 right end of main body Paper 12, main body 2 be internally provided with linkage gear 13, and main body 2 is internally connected with supporting block 15, is provided in supporting block 15 Ball 22, and driven torus 14 is mounted on ball 22, driven internal helical gear 16, and driven internal helical gear are connected on driven torus 14 16 are connected by support rod 20 with main body 2, and the outside of driven internal helical gear 16 is connected with support tube 17, and support tube 17 passes through Compressed spring 21 is connected with link block 18, and compressed spring 21 is set to the inside of support tube 17, the outer end of link block 18 It is provided with and pushes head 19.
The inside that rotation adjusts head 1 is connected by the way of engagement with linkage gear 13, and linkage gear 13 is angularly Be distributed in main body 2, and rotate to adjust by the way of head 1 is connected using bearing and be connected with main body 2, while rotating adjusting head 1 planform is truncated cone-shaped, and the outer end that rotation adjusts head 1 is rubber material, and the rotation that head 1 can be adjusted convenient for rotation drives connection Moving gear 13 rotates, and can guarantee that rotation adjusts the stable rotation of head 1.
Hole is uniformly distributed on exhaust area 5, and the position of exhaust area 5 is corresponding with the position of filter paper 12, and arranges The inside in gas area 5 and filter paper 12 are seamlessly connected, and can be convenient for that the gas inside the device, and the chalk being avoided that in the device is discharged Ash is discharged with gas.
Dust tail bottle 6 is connected by the way of being threadedly coupled with main body 2, and the maximum outside diameter of dust tail bottle 6 and main body 2 Outer diameter it is identical, can dust tail bottle 6 easy to disassemble, be conducive to focus on the dust in dust tail bottle 6, and advantageous In the aesthetics for guaranteeing the device.
The right end of bracket 10 runs through blower 9, and the right end of bracket 10 is connected on pressing plate 11, and bracket 10 and blower 9 For seamless connection, it is avoided that 9 two sides of blower except fan blade part connects, can guarantee the stable absorption chalk dust of blower 9, and energy The dust in dust tail bottle 6 is squeezed with dynamic pressure plate 11.
The planform of pressing plate 11 is cone, and the axis of pressing plate 11 is overlapped with the axis of dust tail bottle 6, is avoided that ash Dirt is accumulated on pressing plate 11.
The driven equal angular outside for being nested in driven torus 14 of internal helical gear 16, and the inside of driven internal helical gear 16 uses The mode of engagement is connected with driven torus 14, and the outside of driven torus 14 is connected by the way of engagement with linkage gear 13 It connects, while the connection type of driven torus 14 and supporting block 15 is identical as the connection type of sliding block 4 and sliding slot 3, it can be convenient for linkage tooth Wheel 13 drives driven torus 14 to rotate, then makes driven internal helical gear 16 while rotating, and can guarantee that driven torus 14 is stable and turn It is dynamic.
The equal angular outside for being connected to driven internal helical gear 16 of support tube 17, and support tube 17 by the way of nested with Link block 18 is connected, and the truncated cone-shaped that head 19 is rubber material is pushed in 18 upper end of link block, can pipe 17 easy to support with Driven internal helical gear 16 rotates synchronously, and can squeeze chalk convenient for the pushing head 19 of rubber material, destroys in order to avoid pushing head 19 Chalk.
The planform of support rod 20 be " V " font, and support rod 20 using bearing connection by the way of and driven interior helical teeth The both ends of wheel 16 are connected, can be convenient for being connect by support rod 20 with the bearings at both ends of driven internal helical gear 16, to driven interior oblique Gear 16 is supported, in order to guarantee the rotation stable under the drive of driven torus 14 of driven internal helical gear 16.
Button cell: being installed into button cell box 8 by working principle first, and this is had rotary adjustment structure Teaching is carried with dust arrester installation to classroom, then chalk end is inserted by the left end that rotation adjusts head 1, protrudes into pushing head Between 19, at this point, compressed spring 21 is pressurized, apply reversed extruding force to chalk, is rotated further by rotation and adjusts head 1, due to rotation Connection is engaged with linkage gear 13 in the inside of modulation section header 1, so rotation adjusts the rotation of head 1, will drive 13 turns of linkage gear It is dynamic, and since linkage gear 13 engages connection, and the upper end of driven torus 14 and driven internal helical gear 16 with the outside of driven torus 14 Engagement connection, so driven torus 14 and driven internal helical gear 16 will rotate simultaneously, the rotation of driven internal helical gear 16 will make to push First 19 rotation, so that chalk is mobile to the inside of chalk sleeve 23, until rotation adjusts the chalk length energy that 1 left end of head is stretched out Until convenient for teacher's use, so far, the use preparation of the dust arrester installation is just completed;
Then the power switch of blower 9 is opened, and pinches the both ends (make suction inlet 7 downward) of the dust arrester installation, at this point, passing through again Rotation adjusts the chalk end that 1 left end of head is stretched out and is write on blackboard, during writing, inevitably generates powder Pen ash, at this point, blower 9 will make to generate suction at suction inlet 7, and then the chalk dust for writing generation will pass through 7 quilt of suction inlet The inside of main body 2 is sucked, chalk dust is after through blower 9, it will contacts with filter paper 12, due to the barrier of filter paper 12, chalk dust It will cannot be discharged with air by the hole of exhaust area 5, final chalk dust can fall into the inside of dust tail bottle 6, so as to keep away Exempt to write the chalk ash pollution environment generated and endangers teachers ' health;
After using dust arrester installation one end time, make it in vertical state, and slide sliding block 4 in sliding slot 3, sliding block 4 Sliding, the pressing plate 11 for driving bracket 10 and bracket 10 to connect is mobile, and pressing plate 11 is moved into dust tail bottle 6, and then is squeezed Chalk dust in dust tail bottle 6, so that chalk dust forms muffin, when slidably distance is smaller in sliding slot 3 for sliding block 4, just Dust tail bottle 6 can be removed by way of rotation, and the muffin in dust tail bottle 6 is handled, due in dust tail bottle 6 Chalk dust is squeezed into muffin, Gu in processing, the case where capable of reducing dust from flying, it is fine to be conducive to environment, in this specification The content being not described in detail belongs to the prior art well known to professional and technical personnel in the field.
It is to be appreciated that term " center ", " longitudinal direction ", " transverse direction ", "front", "rear", "left", "right", "vertical", " water It is flat ", "top", "bottom", "inner", the instructions such as "outside" orientation or positional relationship be to be based on the orientation or positional relationship shown in the drawings, It is only the present invention and simplified description for ease of description, rather than indicating or imply signified device or element must have specifically Orientation is constructed and is operated for specific orientation, thus should not be understood as the limitation to present invention protection content.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding And modification, the scope of the present invention is defined by the appended.

Claims (9)

1. a kind of teaching dust arrester installation for having rotary adjustment structure, including rotation adjust head (1), it is characterised in that: institute It states rotation and adjusts the left end that head (1) is connected to main body (2), and the upper surface of main body (2) is provided with sliding slot (3), the sliding slot (3) It being inside connected with sliding block (4), and sliding block (4) is set on bracket (10), the lower surface of the main body (2) is provided with suction inlet (7), And the lower surface of main body (2) is equipped with button cell box (8), is provided with exhaust area (5) on the outside of the right end of the main body (2), and The right end of main body (2) is connected with dust tail bottle (6), and the bracket (10) is set between main body (2) and chalk sleeve (23), and powder The pen cap (23) is set to the inside of main body (2), and the right end of the chalk sleeve (23) is equipped with blower (9), and the outside of blower (9) It is connected on the inside of main body (2), and is provided with filter paper (12) on the inside of main body (2) right end, the inside of the main body (2) is set It is equipped with linkage gear (13), and main body (2) is internally connected with supporting block (15), on the supporting block (15) is provided with ball (22), it and on ball (22) is mounted with driven torus (14), is connected with driven internal helical gear (16) on the driven torus (14), and from Dynamic internal helical gear (16) are connected by support rod (20) with main body (2), are connected on the outside of the driven internal helical gear (16) Support tube (17), and support tube (17) is connected by compressed spring (21) with link block (18), and compressed spring (21) is set It is placed in the inside of support tube (17), the outer end of the link block (18), which is provided with, pushes head (19).
2. a kind of teaching dust arrester installation for having rotary adjustment structure according to claim 1, it is characterised in that: institute The inside for stating rotation adjusting head (1) is connected by the way of engagement with linkage gear (13), and linkage gear (13) is angularly Be distributed on main body (2), and rotate to adjust by the way of head (1) is connected using bearing and be connected with main body (2), rotate simultaneously The planform for adjusting head (1) is truncated cone-shaped, and the outer end that rotation adjusts head (1) is rubber material.
3. a kind of teaching dust arrester installation for having rotary adjustment structure according to claim 1, it is characterised in that: institute It states and is uniformly distributed with hole on exhaust area (5), and the position of exhaust area (5) is corresponding with the position of filter paper (12), and arranges The inside and filter paper (12) in gas area (5) are seamlessly connected.
4. a kind of teaching dust arrester installation for having rotary adjustment structure according to claim 1, it is characterised in that: institute It states dust tail bottle (6) to be connected by the way of being threadedly coupled with main body (2), and the maximum outside diameter and main body of dust tail bottle (6) (2) outer diameter is identical.
5. a kind of teaching dust arrester installation for having rotary adjustment structure according to claim 1, it is characterised in that: institute The right end of bracket (10) is stated through blower (9), and the right end of bracket (10) is connected on pressing plate (11), and bracket (10) and wind Machine (9) is seamless connection.
6. a kind of teaching dust arrester installation for having rotary adjustment structure according to claim 5, it is characterised in that: institute The planform of pressing plate (11) is stated as cone, and the axis of pressing plate (11) is overlapped with the axis of dust tail bottle (6).
7. a kind of teaching dust arrester installation for having rotary adjustment structure according to claim 1, it is characterised in that: institute The equal angular outside for being nested in driven torus (14) of driven internal helical gear (16) is stated, and the inside of driven internal helical gear (16) uses The mode of engagement is connected with driven torus (14), and the outside of driven torus (14) using engagement by the way of with linkage gear (13) It is connected, while the connection type of driven torus (14) and supporting block (15) is identical as the connection type of sliding block (4) and sliding slot (3).
8. a kind of teaching dust arrester installation for having rotary adjustment structure according to claim 1, it is characterised in that: institute State the equal angular outside for being connected to driven internal helical gear (16) of support tube (17), and support tube (17) by the way of nested with Link block (18) is connected, and the pushing head (19) of link block (18) upper end is the truncated cone-shaped of rubber material.
9. a kind of teaching dust arrester installation for having rotary adjustment structure according to claim 1, it is characterised in that: institute State support rod (20) planform be " V " font, and support rod (20) using bearing connection by the way of and driven internal helical gear (16) both ends are connected.
CN201811391886.1A 2018-11-21 2018-11-21 A kind of teaching dust arrester installation having rotary adjustment structure Pending CN109605995A (en)

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CN201811391886.1A CN109605995A (en) 2018-11-21 2018-11-21 A kind of teaching dust arrester installation having rotary adjustment structure

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Application Number Priority Date Filing Date Title
CN201811391886.1A CN109605995A (en) 2018-11-21 2018-11-21 A kind of teaching dust arrester installation having rotary adjustment structure

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CN109605995A true CN109605995A (en) 2019-04-12

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CN204160943U (en) * 2014-09-17 2015-02-18 何天宇 A kind of chalk sleeve
CN204382885U (en) * 2015-01-23 2015-06-10 王长青 Automatic change-fountain pen chalk sleeve
CN204382891U (en) * 2014-12-12 2015-06-10 袁闻婧 Dustproof chalk cover
CN204957374U (en) * 2015-09-08 2016-01-13 西安石油大学 Chalk butler
CN105365448A (en) * 2015-11-19 2016-03-02 华蓥市阳和镇小学 Multifunctional chalk sleeve
CN205149328U (en) * 2015-11-19 2016-04-13 黄子霄 Blackboard dust groove intelligent vehicle cleaning device
CN205661204U (en) * 2016-04-19 2016-10-26 王梦婷 But dust extraction's chalk cover for teaching
CN107618286A (en) * 2017-10-10 2018-01-23 王伟民 A kind of education and instruction capable of preventing hand from injury chalk sleeve
CN107738528A (en) * 2017-10-19 2018-02-27 绍兴柯桥韩玉电子科技有限公司 A kind of blackboard for teaching for being easy to deashing
CN108437658A (en) * 2018-06-13 2018-08-24 桂林华冶机械制造有限公司 A kind of chalk dust-prevention protecting jacket
CN208118786U (en) * 2017-09-26 2018-11-20 重庆城市管理职业学院 A kind of multifunction teaching auxiliary tool

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1329805A (en) * 1917-04-12 1920-02-03 Lees Bradner Co Method of generating worm-wheels
CN101808771A (en) * 2007-12-14 2010-08-18 三菱重工业株式会社 Barrel worm-shaped tool
CN102328526A (en) * 2010-07-14 2012-01-25 蓝晓华 Convenient chalk sleeve
CN202319628U (en) * 2011-11-26 2012-07-11 李玉祥 Dust-removing blackboard eraser
CN102555606A (en) * 2012-03-14 2012-07-11 福州市台江区振斌高效电磁聚能科技研究所 Chalk cover
CN204160943U (en) * 2014-09-17 2015-02-18 何天宇 A kind of chalk sleeve
CN204382891U (en) * 2014-12-12 2015-06-10 袁闻婧 Dustproof chalk cover
CN204382885U (en) * 2015-01-23 2015-06-10 王长青 Automatic change-fountain pen chalk sleeve
CN204957374U (en) * 2015-09-08 2016-01-13 西安石油大学 Chalk butler
CN105365448A (en) * 2015-11-19 2016-03-02 华蓥市阳和镇小学 Multifunctional chalk sleeve
CN205149328U (en) * 2015-11-19 2016-04-13 黄子霄 Blackboard dust groove intelligent vehicle cleaning device
CN205661204U (en) * 2016-04-19 2016-10-26 王梦婷 But dust extraction's chalk cover for teaching
CN208118786U (en) * 2017-09-26 2018-11-20 重庆城市管理职业学院 A kind of multifunction teaching auxiliary tool
CN107618286A (en) * 2017-10-10 2018-01-23 王伟民 A kind of education and instruction capable of preventing hand from injury chalk sleeve
CN107738528A (en) * 2017-10-19 2018-02-27 绍兴柯桥韩玉电子科技有限公司 A kind of blackboard for teaching for being easy to deashing
CN108437658A (en) * 2018-06-13 2018-08-24 桂林华冶机械制造有限公司 A kind of chalk dust-prevention protecting jacket

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Application publication date: 20190412