CN110001241A - A kind of multi-function chalk casing - Google Patents
A kind of multi-function chalk casing Download PDFInfo
- Publication number
- CN110001241A CN110001241A CN201910328412.0A CN201910328412A CN110001241A CN 110001241 A CN110001241 A CN 110001241A CN 201910328412 A CN201910328412 A CN 201910328412A CN 110001241 A CN110001241 A CN 110001241A
- Authority
- CN
- China
- Prior art keywords
- tailstock
- roller
- shell
- hollow sleeve
- sleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000005336 cracking Methods 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 208000004141 microcephaly Diseases 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K23/00—Holders or connectors for writing implements; Means for protecting the writing-points
- B43K23/016—Holders for crayons or chalks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43K—IMPLEMENTS FOR WRITING OR DRAWING
- B43K24/00—Mechanisms for selecting, projecting, retracting or locking writing units
- B43K24/02—Mechanisms for selecting, projecting, retracting or locking writing units for locking a single writing unit in only fully projected or retracted positions
- B43K24/06—Mechanisms for selecting, projecting, retracting or locking writing units for locking a single writing unit in only fully projected or retracted positions operated by turning means
Landscapes
- Toys (AREA)
Abstract
The present invention provides a kind of multi-function chalk casing, including the shell with inner cavity, sleeve assembly includes the first hollow sleeve, the second hollow sleeve for extending along the first hollow sleeve end and the annular slide plate for being located at outer wall in the middle part of the second hollow sleeve, drum assembly includes roller, support column, connecting rod, tailstock and plasticity intermediate plate, roller lateral wall is slidably matched with case inside wall, support column is mutually fixed with roller, connecting rod one end passes through support column and matches with roller, the other end passes through tailstock and mutually fixes with several circumferentially distributed plasticity intermediate plates, each plasticity intermediate plate is obliquely installed with tailstock inner sidewall, tailstock is matched with the second hollow sleeve；It is equipped with two-wire internal screw thread guide rail close to the inner sidewall of housing forward end, two-wire internal screw thread guide rail is matched with annular slide plate；Shell positioned at two-wire internal screw thread guide rail rear end is equipped with sliding mouth, and sliding mouth is opposite with roller lateral wall.Compared with prior art, the present invention being less prone to stuck phenomenon, easy to operate, service performance is stablized.
Description
Technical field
The invention belongs to realia technical fields, are related to a kind of multi-function chalk casing.
Background technique
Currently, chalk, laser pen and teaching pole are the nowadays big educational aids of teacher common three, in teacher's school session, when
Need to allow student viewing projector and when explaining, teacher is often prompted using laser pen；When needing that student is allowed to check blackboard
When content, teacher is often given directions using teaching pole；Teacher can also be explained on blackboard with chalk simultaneously.It deposits in the prior art
In a kind of chalk sleeve, including the shell with inner cavity.Itself the problem is that: although occurring on the market by laser pen and chalk
The product being combined, but user is when in use, since the texture material of chalk is very crisp, and intensity, rigidity and toughness
All very poor, chalk is easy to appear stuck, or even can be broken because of discontinuity, lead to inconvenient to use, service performance
It is unstable.
For this purpose, the present invention provides a kind of multi-function chalk casing.
Summary of the invention
In view of the above problem existing for existing technology, the purpose of the present invention is to provide a kind of multi-function chalk casing, this
The dynamics that kind feeding mode need to only hold operation can adjust the length that chalk is sent out or is sent into according to actual needs, be not easy out
Existing stuck phenomenon；Plasticity intermediate plate is provided on tailstock simultaneously and protrusion is set in rubber sleeve, can be made in chalk use not
It can fall, will not be more broken because of discontinuity, therefore easy to operate, service performance is stablized.
Object of the invention can be realized by the following technical scheme:
A kind of multi-function chalk casing further includes the rubber sleeve for being set in housing forward end, is all provided with including the shell with inner cavity
In the sleeve assembly and drum assembly of housing cavity, the sleeve assembly includes the first hollow sleeve, along the first hollow sleeve end
Second hollow sleeve of portion's extension and the annular slide plate for being located at outer wall in the middle part of the second hollow sleeve, the drum assembly include rolling
Cylinder, support column, connecting rod, tailstock and plasticity intermediate plate, roller lateral wall are slidably matched with case inside wall, support column and roller phase
Fixed, connecting rod one end passes through support column and matches with roller, and the other end passes through tailstock and several circumferentially distributed plasticity are pressed from both sides
Piece is mutually fixed, and each plasticity intermediate plate is obliquely installed with tailstock inner sidewall, and tailstock is matched with the second hollow sleeve；
Shell, rubber sleeve and the first hollow sleeve are equipped with the gap of gradually cracking for placing chalk, gradually close to shell
Gap of cracking two sides are equipped with the first plastic button and the second plastic button that are detachably connected, rubber sleeve inner sidewall circumferentially arranged with protrusion,
Protrusion is made of rubber material；
Two-wire internal screw thread guide rail, two-wire internal screw thread guide rail and annular slide plate phase are equipped with close to the inner sidewall of the housing forward end
Cooperation；Shell positioned at two-wire internal screw thread guide rail rear end is equipped with sliding mouth, and sliding mouth is opposite with roller lateral wall.
It as a preferred technical solution, further include infrared ray steel ball, the housing rear end is equipped with groove, in infrared ray steel ball
In groove；
It is equipped with the button for ppt page turning close to the housing exterior walls of groove, button is matched with infrared ray steel ball.
It as a preferred technical solution, further include several non-slip grooves, each non-slip groove is each provided at housing forward end and sliding mouth
Between, each non-slip groove is along axial direction and is evenly spaced apart on the outer wall for being laid in shell.
It as a preferred technical solution, further include magnet, magnet is embedded on shell.
The first taper canister portion that the shell has cylindrical part, extends along cylindrical part front end as a preferred technical solution,
And along cylindrical part rear end extend the second taper canister portion, the cylindrical part respectively with the first taper canister portion and the second taper canister portion
Connection, sliding mouth are located at the rear end of cylindrical part.
The support column includes the round plate body of cylinder and cylindrical end portions circumferentially extending, tail as a preferred technical solution,
Seat it is cylindrical, the diameter of round plate body is identical with the diameter of the tailstock, the connecting rod sequentially pass through round plate body, cylinder and
Roller matches.
The rubber sleeve is in open column shape as a preferred technical solution, and the one of the rubber sleeve of the separate housing forward end
Part is equipped with several spacing tracks, and each spacing track is uniformly distributed circumferentially, and the protrusion is located at the rubber sleeve close to spacing track
On inner sidewall
As described above, a kind of multi-function chalk casing of the present invention, has the advantages that
After the present invention utilizes above-mentioned multi-function chalk casing, compared with prior art, due to using such structure, pass through
Open plastic button, open gap of gradually cracking and chalk be placed on tailstock, protruding into sliding mouth with hand makes rollers roll, annular slide plate with
Under the action of shearing force, frictional force between two-wire internal screw thread guide rail, tailstock and the second hollow sleeve cooperate, that is to say, that two-wire
The rotary motion of internal screw thread guide rail is converted into the linear motion of annular slide plate, so that tailstock be pushed to move, and then drives chalk court
It is moved to close to or far from housing forward end, the dynamics that such feeding mode need to only hold operation can adjust according to actual needs
The length that chalk is sent out or is sent into, is less prone to stuck phenomenon；Plasticity intermediate plate is provided on tailstock simultaneously and in rubber sleeve
Setting protrusion, can be such that chalk does not fall out in, will not more be broken because of discontinuity, therefore easy to operate, usability
It can stablize.
The present invention is further illustrated With reference to embodiment.
Detailed description of the invention
Fig. 1 is a kind of perspective view of multi-function chalk casing；
Fig. 2 is a kind of part-structure exploded view of multi-function chalk casing；
Fig. 3 is a kind of one viewing angle constructions schematic diagram of shell of multi-function chalk casing；
Fig. 4 is the perspective view that a kind of multi-function chalk casing is free of shell；
Fig. 5 is the A-A sectional view of Fig. 4；
Fig. 6 is a kind of rubber sleeve schematic enlarged-scale view of multi-function chalk casing.
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book is understood other advantages and efficacy of the present invention easily.
It should be clear that structure depicted in this specification attached drawing, ratio, size etc., only to cooperate specification revealed
Content is not intended to limit the invention enforceable qualifications, therefore does not have so that those skilled in the art understands and reads
Technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size are not influencing institute's energy of the present invention
Under the effect of generation and the purpose that can reach, should all still it fall in the range of disclosed technology contents can cover.
Meanwhile cited such as "upper" in this specification, "lower", "left", "right", " centre " and " one " term, be merely convenient to
Narration is illustrated, rather than to limit the scope of the invention, relativeness is altered or modified, and is changing skill without essence
It is held in art, when being also considered as the enforceable scope of the present invention.The attached drawing that specific structure can refer to patent application is illustrated.
In the examples below, direction is defined always with paper Fig. 3 arrow mark, using the left side of paper as left direction, paper
Right side be right direction, the upside of paper is upper direction, and the downside of paper is lower direction, using the front side perpendicular to paper as front
To being interior with housing cavity, be outer with housing exterior walls using the rear side perpendicular to paper as rear direction.
In conjunction with shown in Fig. 1 to Fig. 6, a kind of multi-function chalk casing further includes being set in including the shell 1 with inner cavity 11
The rubber sleeve 2 of 1 front end of shell, the sleeve assembly 3 and drum assembly 4 for being each provided at 1 inner cavity 11 of shell, the sleeve assembly 3 include
First hollow sleeve 31, along 31 end of the first hollow sleeve extend the second hollow sleeve 32 and be located at the second hollow sleeve 32
The annular slide plate 33 of middle part outer wall, the drum assembly 4 include roller 41, support column 42, connecting rod 43, tailstock 44 and plasticity folder
Piece 45,41 lateral wall of roller are slidably matched with 1 inner sidewall of shell, and support column 42 is fixed with 41 phase of roller, and 43 one end of connecting rod passes through
Support column 42 is matched with roller 41, and the other end passes through tailstock 44 and fixes with several circumferentially distributed 45 phases of plasticity intermediate plate,
Each plasticity intermediate plate 45 is obliquely installed with 44 inner sidewall of tailstock, and tailstock 44 is matched with the second hollow sleeve 32；
Shell 1, rubber sleeve 2 and the first hollow sleeve 31 are equipped with the gap 5 of gradually cracking for placing chalk, close to shell
15 two sides of gap of gradually cracking are equipped with the first plastic button 12 and the second plastic button 13 being detachably connected, and 2 inner sidewall of rubber sleeve is along week
To protrusion 21 is equipped with, protrusion 21 is made of rubber material；
Inner sidewall close to 1 front end of shell is equipped with two-wire internal screw thread guide rail 14, two-wire internal screw thread guide rail 14 and annular
Slide plate 33 matches；Shell positioned at 14 rear end of two-wire internal screw thread guide rail is equipped with sliding mouth 15, sliding mouth 15 and 41 lateral wall of roller
Relatively.
The present invention opens gap 5 of gradually cracking and chalk is placed on tailstock 44, protrude into sliding mouth 15 with hand by opening plastic button
Roller 41 is rolled, under the action of shearing force between annular slide plate 33 and two-wire internal screw thread guide rail 14, frictional force, tailstock 44
Cooperate with the second hollow sleeve 32, that is to say, that the rotary motion of two-wire internal screw thread guide rail 14 is converted into the straight line of annular slide plate 33
Movement so that tailstock 44 be pushed to move, and then drives chalk towards close to or far from 1 nose motion of shell, and such chalk sleeve is sent
The dynamics that operation need to be only held into mode can adjust the length that chalk is sent out or is sent into according to actual needs, be less prone to card
Dead phenomenon；Plasticity intermediate plate 45 is provided on tailstock simultaneously and protrusion 21 is set in rubber sleeve 2, can be made in chalk use not
It can fall, will not be more broken because of discontinuity, therefore easy to operate, service performance is stablized.
It should be understood that roller 41 and connecting rod 43 and plasticity intermediate plate 45 be it is connected, only need to protrude into sliding mouth 15 with hand
And the dynamics for stirring roller 41 is held, so that the rotation of connecting rod 43 is stretched out and clamp the tail end of chalk with dynamic-plasticity intermediate plate 45, then cooperate
The plasticity effect of the protrusion 21 of the rubber sleeve 2 of chalk sleeve is clamped the front end of chalk also.Since the texture material of chalk is very crisp,
And intensity, rigidity and toughness are all very poor, and chalk either microcephaly or major part first stretches out, and can all have opening, reset two steps
Suddenly, it therefore using the above structure can make chalk during propulsion or submitting, chalk can be made to be clamped always, in this way
It avoids chalk from falling, even fracture because of unbalance stress.
It referring to figs. 1 and 2, further include infrared ray steel ball 6,1 rear end of shell is equipped with groove 16, infrared ray steel ball
6 are embedded in groove 16；
It is equipped with the button 7 for ppt page turning close to the housing exterior walls of groove 16, button 7 and infrared ray steel ball 6 match
It closes.By the way that above structure is arranged, can preferably impart knowledge to students with the luminous point that infrared steel ball 6 emits according on the screen；It sets simultaneously
The button 7 for ppt page-turning function is set, teaching is facilitated, is easy to use.
It further include several non-slip grooves 17, before each non-slip groove 17 is each provided at shell 1 in conjunction with shown in Fig. 1 or Fig. 2 or Fig. 3
Between end and sliding mouth 15, each non-slip groove 17 is along axial direction and is evenly spaced apart on the outer wall for being laid in shell 1.In this way, user
In use, by holding non-slip groove 17, increase the frictional force between hand and shell 1, avoid the slippage of shell 1, have
Highly-safe feature.
It as shown in connection with fig. 3, further include magnet 8 for the ease of placing multi-functional chalk sleeve of the invention, magnet 8 is embedded
On shell 1.By the way that magnet 8 is arranged, when not using chalk sleeve, might as well be adsorbed on the irony side of the blackboard in classroom,
Facilitate reuse next time, and does not have to find worry again because leaving about；Parking space has been vacateed simultaneously, has saved space.
In conjunction with shown in Fig. 1 or Fig. 3, the shell 1 has cylindrical part 111, along the first conically shaped of cylindrical part front end extension
Portion 112 and along 111 rear end of cylindrical part extend the second taper canister portion 113, the cylindrical part 111 respectively with the first taper canister portion
112 are connected to the second taper canister portion 113, and sliding mouth 15 is located at the rear end of cylindrical part 111.
In conjunction with shown in Fig. 2, Fig. 4 and Fig. 5, the support column 42 includes that cylinder 421 and 421 end of cylinder circumferentially extend
Round plate body 422, tailstock is cylindrical, and the diameter of round plate body 422 is identical as the diameter of the tailstock 44, the connecting rod 43 according to
It is secondary to be matched across round plate body 422, cylinder 421 with roller 41.
In conjunction with shown in Fig. 1 and Fig. 6, the rubber sleeve 2 is in open column shape, and the one of the rubber sleeve 2 of separate 1 front end of shell
Part is equipped with several spacing tracks 22, and each spacing track 22 is uniformly distributed circumferentially, and described raised 21 are located at close to spacing track 22
2 inner sidewall of rubber sleeve on
As described above, a kind of multi-function chalk casing of the present invention, has the advantages that
After the present invention utilizes above-mentioned multi-function chalk casing, compared with prior art, due to using such structure, pass through
Open plastic button, open gap of gradually cracking and chalk be placed on tailstock, protruding into sliding mouth with hand makes rollers roll, annular slide plate with
Under the action of shearing force, frictional force between two-wire internal screw thread guide rail, tailstock and the second hollow sleeve cooperate, that is to say, that two-wire
The rotary motion of internal screw thread guide rail is converted into the linear motion of annular slide plate, so that tailstock be pushed to move, and then drives chalk court
It is moved to close to or far from housing forward end, the dynamics that such feeding mode need to only hold operation can adjust according to actual needs
The length that chalk is sent out or is sent into, is less prone to stuck phenomenon；Plasticity intermediate plate is provided on tailstock simultaneously and in rubber sleeve
Setting protrusion, can be such that chalk does not fall out in, will not more be broken because of discontinuity, therefore easy to operate, usability
It can stablize.
In conclusion the present invention effectively overcomes various shortcoming in the prior art and has high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (7)
1. a kind of multi-function chalk casing, including the shell with inner cavity, it is characterised in that: further include the rubber for being set in housing forward end
Gum cover, the sleeve assembly and drum assembly for being each provided at housing cavity, the sleeve assembly include the first hollow sleeve, along first
Second hollow sleeve of empty set end extension and the annular slide plate for being located at outer wall in the middle part of the second hollow sleeve, the roller group
Part includes roller, support column, connecting rod, tailstock and plasticity intermediate plate, and roller lateral wall is slidably matched with case inside wall, support column
Mutually fixed with roller, connecting rod one end passes through support column and matches with roller, the other end across tailstock with it is circumferentially distributed several
A plasticity intermediate plate is mutually fixed, and each plasticity intermediate plate is obliquely installed with tailstock inner sidewall, and tailstock is matched with the second hollow sleeve；
Shell, rubber sleeve and the first hollow sleeve are equipped with the gap of gradually cracking for placing chalk, close to gradually cracking for shell
Gap two sides are equipped with the first plastic button and the second plastic button being detachably connected, and rubber sleeve inner sidewall is circumferentially arranged with protrusion, protrusion
It is made of rubber material；
It is equipped with two-wire internal screw thread guide rail close to the inner sidewall of the housing forward end, two-wire internal screw thread guide rail and annular slide plate match
It closes；Shell positioned at two-wire internal screw thread guide rail rear end is equipped with sliding mouth, and sliding mouth is opposite with roller lateral wall.
2. multi-function chalk casing as described in claim 1, it is characterised in that: further include infrared ray steel ball, the housing rear end
Equipped with groove, infrared ray steel ball is embedded in groove；
It is equipped with the button for ppt page turning close to the housing exterior walls of groove, button is matched with infrared ray steel ball.
3. multi-function chalk casing as described in claim 1, it is characterised in that: further include several non-slip grooves, each non-slip groove
It is each provided between housing forward end and sliding mouth, each non-slip groove is along axial direction and is evenly spaced apart on the outer wall for being laid in shell.
4. multi-function chalk casing as described in claim 1, it is characterised in that: further include magnet, magnet is embedded on shell.
5. multi-function chalk casing according to any one of claims 1-4, it is characterised in that: the shell has cylindrical part, edge
The first taper canister portion that cylindrical part front end extends and the second taper canister portion extended along cylindrical part rear end, the cylindrical part difference
It is connected to the first taper canister portion and the second taper canister portion, sliding mouth is located at the rear end of cylindrical part.
6. multi-function chalk casing according to any one of claims 1-4, it is characterised in that: the support column includes cylinder and column
The round plate body of body end portion circumferentially extending, tailstock is cylindrical, and the diameter of round plate body is identical as the diameter of the tailstock, described
Connecting rod sequentially passes through round plate body, cylinder is matched with roller.
7. multi-function chalk casing according to any one of claims 1-4, it is characterised in that: the rubber sleeve is in open column shape,
A part of rubber sleeve far from the housing forward end is equipped with several spacing tracks, and each spacing track is uniformly distributed circumferentially, institute
Protrusion is stated to be located on the rubber sleeve inner sidewall of spacing track.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910328412.0A CN110001241A (en) | 2019-04-23 | 2019-04-23 | A kind of multi-function chalk casing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910328412.0A CN110001241A (en) | 2019-04-23 | 2019-04-23 | A kind of multi-function chalk casing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110001241A true CN110001241A (en) | 2019-07-12 |
Family
ID=67173657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910328412.0A Pending CN110001241A (en) | 2019-04-23 | 2019-04-23 | A kind of multi-function chalk casing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110001241A (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2226527Y (en) * | 1995-08-29 | 1996-05-08 | 赵交生 | Spiral chalk clip |
| JPH11286197A (en) * | 1998-04-02 | 1999-10-19 | Kotobuki:Kk | Stick-out container |
| CN2394790Y (en) * | 1999-11-01 | 2000-09-06 | 李波 | Movable chalk sleeve |
| KR200448005Y1 (en) * | 2009-06-18 | 2010-03-09 | (주)금강칠판교구산업 | Chalk holder |
| CN202702970U (en) * | 2012-07-10 | 2013-01-30 | 李守冰 | Telescopic chalk sleeve |
| CN203032158U (en) * | 2012-11-29 | 2013-07-03 | 牛家豪 | Chalk sleeve |
| CN203832059U (en) * | 2014-05-26 | 2014-09-17 | 嘉兴职业技术学院 | Chalk sleeve |
| CN204136629U (en) * | 2014-06-20 | 2015-02-04 | 攀枝花学院 | Multifunctional chalk clamping device |
| CN204936586U (en) * | 2015-08-06 | 2016-01-06 | 王澳西 | A kind of novel chalk casing |
| CN106183545A (en) * | 2016-08-12 | 2016-12-07 | 上海电力学院 | Screw-pushing type automatic dust-free chalk sleeve |
| CN108058509A (en) * | 2016-11-08 | 2018-05-22 | 四川省广安第二中学校 | A kind of laser chalk sleeve |
| CN207758424U (en) * | 2017-11-24 | 2018-08-24 | 杨方强 | A kind of Dustproof chalk cover |
| CN207842443U (en) * | 2017-11-22 | 2018-09-11 | 陈洪建 | A kind of chalk tube |
-
2019
- 2019-04-23 CN CN201910328412.0A patent/CN110001241A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2226527Y (en) * | 1995-08-29 | 1996-05-08 | 赵交生 | Spiral chalk clip |
| JPH11286197A (en) * | 1998-04-02 | 1999-10-19 | Kotobuki:Kk | Stick-out container |
| CN2394790Y (en) * | 1999-11-01 | 2000-09-06 | 李波 | Movable chalk sleeve |
| KR200448005Y1 (en) * | 2009-06-18 | 2010-03-09 | (주)금강칠판교구산업 | Chalk holder |
| CN202702970U (en) * | 2012-07-10 | 2013-01-30 | 李守冰 | Telescopic chalk sleeve |
| CN203032158U (en) * | 2012-11-29 | 2013-07-03 | 牛家豪 | Chalk sleeve |
| CN203832059U (en) * | 2014-05-26 | 2014-09-17 | 嘉兴职业技术学院 | Chalk sleeve |
| CN204136629U (en) * | 2014-06-20 | 2015-02-04 | 攀枝花学院 | Multifunctional chalk clamping device |
| CN204936586U (en) * | 2015-08-06 | 2016-01-06 | 王澳西 | A kind of novel chalk casing |
| CN106183545A (en) * | 2016-08-12 | 2016-12-07 | 上海电力学院 | Screw-pushing type automatic dust-free chalk sleeve |
| CN108058509A (en) * | 2016-11-08 | 2018-05-22 | 四川省广安第二中学校 | A kind of laser chalk sleeve |
| CN207842443U (en) * | 2017-11-22 | 2018-09-11 | 陈洪建 | A kind of chalk tube |
| CN207758424U (en) * | 2017-11-24 | 2018-08-24 | 杨方强 | A kind of Dustproof chalk cover |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190712 |