CN204712744U - Closed blackboard eraser - Google Patents
Closed blackboard eraser Download PDFInfo
- Publication number
- CN204712744U CN204712744U CN201520381048.1U CN201520381048U CN204712744U CN 204712744 U CN204712744 U CN 204712744U CN 201520381048 U CN201520381048 U CN 201520381048U CN 204712744 U CN204712744 U CN 204712744U
- Authority
- CN
- China
- Prior art keywords
- sucker
- vacuum breaker
- blackboard eraser
- seal head
- breaker passage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000010521 absorption reaction Methods 0.000 claims abstract description 28
- 239000000428 dust Substances 0.000 claims abstract description 24
- 229920000742 Cotton Polymers 0.000 claims abstract description 20
- 238000004140 cleaning Methods 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 5
- 238000004891 communication Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 239000007799 cork Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 2
- 238000013475 authorization Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000013213 extrapolation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Landscapes
- Drawing Aids And Blackboards (AREA)
- Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)
Abstract
The utility model relates to blackboard eraser.A kind of closed blackboard eraser, comprise holding plate, the side of holding plate is provided with cleaning cotton and is looped around the dust cover of cleaning cotton outside, the opposite side of holding plate is provided with circular outer sucker, the interior diameter of the absorption end of outer sucker is less than 3 centimetres, outer sucker is provided with the first vacuum breaker passage and is positioned at the pulling seat of outer sucker outside, pulling seat is provided with the first seal head of sealing first vacuum breaker passage, the first seal head closing spring that driving first seal head seals up the first vacuum breaker passage is provided with in first vacuum breaker passage, cleaning cotton stretches out dirt-proof boot, the distance that cleaning cotton stretches out dirt-proof boot is less than 3 millimeters.The utility model has can be adsorbed on advantage on the palm of the person of writing, that easily can take off when having large suction, that can prevent airborne dust, solve existing blackboard eraser can not take into account fixing reliable and take off easily, can not carry conveniently easily, airborne dust is larger when wiping the letter written with chalk write on the blackboard problem.
Description
Technical field
The utility model relates to blackboard eraser, particularly relates to a kind of closed blackboard eraser.
Background technology
Blackboard eraser refers to for the device by the letter written with chalk erasing on blackboard.By grip part and the cleaning cotton be arranged on holding plate, hold with a hand holding plate during use and cleaning cotton is moved back and forth with after blackboard contact, thus the word on blackboard is wiped out.Inconvenience is deposited when the blackboard eraser of this type uses.In order to improve convenience when blackboard eraser is deposited, have devised the blackboard eraser of band sucker.Stay in that China Patent No. is 2012201509049, Authorization Notice No. is CN202593104U, authorized announcement date be December 12 in 2012 day, be called in the patent document of " novel blackboard eraser " and namely disclose a kind of closed blackboard eraser.Arrange sucker by the side at holding plate in this patent document, the used time is not firmly fixed by sucker suction, to improve convenience when depositing.
The blackboard eraser of existing band sucker has the following disadvantages: be then not easy to take off (requiring great effort when taking off blackboard eraser) if absorption dynamics is little during the absorption great efforts of sucker, and when receiving vibration, blackboard eraser easily falls down; The problem that the person of writing removes to find blackboard eraser can not be solved for the person of writing carries conveniently; Chalk dust meeting four in wiping process goes to wave, and the feature of environmental protection is poor, affects the health of user.
Utility model content
The utility model provides and a kind ofly can be adsorbed on closed blackboard eraser on the palm of the person of writing, that easily can take off when having large suction, that can prevent airborne dust, solve existing blackboard eraser can not take into account fixing reliable and take off easily, can not carry conveniently easily, airborne dust is larger when wiping the letter written with chalk write on the blackboard problem.
Above technical problem is solved by following technical proposal: a kind of closed blackboard eraser, comprise holding plate, the side of described holding plate is provided with cleaning cotton, the opposite side of described holding plate is provided with circular outer sucker, the interior diameter of the absorption end of described outer sucker is less than 3 centimetres, described outer sucker is provided with the first vacuum breaker passage and is positioned at the pulling seat of outer sucker outside, described pulling seat is provided with the first seal head sealing described first vacuum breaker passage, the first seal head closing spring that driving first seal head seals up described first vacuum breaker passage is provided with in described first vacuum breaker passage, described holding plate is provided with the dirt-proof boot being looped around described cleaning cotton outside, described cleaning cotton stretches out described dirt-proof boot, the distance that described cleaning cotton stretches out described dirt-proof boot is less than 3 millimeters.Be designed to be less than 3 centimetres by the interior diameter of the absorption end by outer sucker, blackboard eraser can either be adsorbed on, and other is local, also can be adsorbed on and write, palm on carry conveniently, thus the problem finding blackboard eraser can not be produced, to improve the efficiency of giving lessons of teacher.When taking off blackboard eraser, by pulling seat outward, pulling seat drives the first seal head blow-by to live the first vacuum breaker passage thus realizes the vacuum breaker of outer sucker, thus also can take off like a cork when making sucker have large absorption dynamics.Unclamp when drawing effect to pulling seat outer, under the effect of the first seal head closing spring, the first seal head reseals the first vacuum breaker passage, can adsorb normally next time.The chalk dust produced in wiping process can be stopped by dust cover and not raise outward in a large number.
As preferably, interior sucker is provided with in described outer sucker, described interior sucker is provided with the second vacuum breaker passage extending to outer sucker outer surface, absorption ditch is formed between interior sucker and outer sucker, described pulling seat is also provided with the second seal head sealing described second vacuum breaker passage, is provided with the second seal head closing spring that driving second seal head seals up described second vacuum breaker passage in described second vacuum breaker passage.The working method of interior sucker is identical with the working method of above-mentioned outer sucker, does not repeat at this.During use, by extruding outer sucker and interior sucker simultaneously, make all to form negative pressure in the inner space of outer sucker and absorption ditch, also namely carry out adsorbing together with interior sucker by outer sucker and the utility model is fixed on the ground.When vibrated or instant impact and make outer sucker absorption place produce moment partial disengagement time, under the effect of interior sucker, after instant impact disappears, outer sucker again can recover and adsorb, make sucker be subject to moment impact and produce when local disconnects instantaneously and can not produce vacuum breaker phenomenon, and namely the slippage of absorption affinity littlely can still keep good suction-operated.Further increase that the utility model carries out adsorbing reliability and anti-vibration ability.
As preferably, the absorption end of described interior sucker exceeds the absorption end of described outer sucker.Because outer sucker is positioned at outside, whether absorption can be observed intuitively, and whether interior sucker adsorbs and can not intuitively arrive, if so outer sucker exceeds interior sucker, had the following disadvantages: pressing force is little then may not adsorbed, presses by larger power in order to ensure interior sucker suction then needs by interior sucker, and this power is much and last long and be difficult to grasp on earth, often cause the waste of unnecessary strength and time waste.As long as interior sucker must adsorb when the technical program is then on outer sucker suction, so can convenient and strength-savingly guarantee rapidly on interior sucker suction when using.
As preferably, be provided with the some elastomeric connector strip outer sucker and interior sucker linked together in described absorption ditch, described elastomeric connector strip is along the distribution of outer sucker circumference.When outer sucker and interior sucker all adsorb upper, elastomeric connector strip is elongated and energy storage, and this energy produces the trend impelling outer sucker to move towards absorbate, make when outer sucker produce disconnect instantaneously time, accelerate outer sucker and return to adsorbed state.Also namely reduce further the possibility producing movement when receiving moment impact, also namely improve anti-moment impact ability of the present utility model in other words.
As preferably, described pulling seat is provided with elbow.When being adsorbed on palm, driving by going to push away elbow with finger pulling seat to go to open vacuum breaker passage, convenience when the utility model takes off from palm can be improved.
As preferably, the opening direction of the outer end of described first vacuum breaker passage is towards described holding plate, and described holding plate is provided with and coordinates to limit the limiting section that described first seal head is deviate from described first vacuum breaker passage with described pulling seat.Excessive external force pulling seat can be prevented and cause seal head to deviate from vacuum breaker passage and produce seal head can not automatically reset phenomenon.Improve reliability when automatically reseting.
As preferably, the free end of described dirt-proof boot is provided with suction port, is provided with dust catcher in described holding plate, and described suction port is with the inlet communication of described dust catcher.Can the chalk dust raised be adsorbed into dust catcher outward, play the effect reducing the outer capacity of chalk dust further.Anti-dust waves better effects if.
As preferably, described suction port is the annulus extended along the circumference of dirt-proof boot.Pick-up performance is good.
The utility model has following advantage: can be adsorbed on palm and carry conveniently; Also can take off like a cork when suction is large, good reliability when suction greatly then can make fixing; Can prevent chalk dust from wantonly waving, environment protecting is good, is conducive to the healthy of user.
Accompanying drawing explanation
Fig. 1 is cross-sectional schematic of the present utility model.
In figure: the interior diameter D of the absorption end of the absorption end 44 of the absorption end 24 of holding plate 1, outer sucker 2, first vacuum breaker passage 21, first seal head 22, first seal head closing spring 23, outer sucker, pulling seat 3, elbow 31, limiting section 32, interior sucker 4, second vacuum breaker passage 41, second seal head 42, second seal head closing spring 43, interior sucker, cleaning cotton 5, absorption ditch 6, elastomeric connector strip 61, outer sucker.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the utility model is further described.
See Fig. 1, a kind of closed blackboard eraser, comprises holding plate 1 and pulling seat 3.The upside of holding plate 1 is provided with cleaning cotton 5 and dirt-proof boot 7.
It is outside that dirt-proof boot 7 is looped around cleaning cotton 5.Cleaning cotton 5 stretches out dirt-proof boot 7.The distance L that cleaning cotton stretches out dirt-proof boot is less than 3 millimeters.The free end of dirt-proof boot 7 is provided with suction port 71.Suction port 71 is the annulus extended along the circumference of dirt-proof boot 7.Dust catcher 11 is provided with in holding plate 1.Suction port 71 is with the inlet communication of dust catcher 11.
The downside of holding plate 1 is provided with outer sucker 2.Outer sucker 2 is circular magnetic chuck.The interior diameter D of the absorption end of outer sucker is less than 3 centimetres.Outer sucker 2 is made for rubber.Outer sucker 2 is provided with the first vacuum breaker passage 21.The opening direction of the first vacuum breaker passage 21 is towards holding plate 1.The first seal head 22 and the first seal head closing spring 23 is provided with in first vacuum breaker passage 21.One end of first seal head 22 is fixed together with pulling seat 3, the other end is located in the first vacuum breaker passage 21.First seal head closing spring 23 one end links together with the inner of the first seal head 22, the other end links together with the wall of the first vacuum breaker passage 21.First vacuum breaker passage 21 seals up for making the first seal head 22 by the first seal head closing spring 23.Interior sucker 4 is provided with in outer sucker 2.
Interior sucker 4 is rubber structure.Interior sucker 4 and outer sucker 2 are structure as a whole.Interior sucker 4 is provided with the second vacuum breaker passage 41 extending to outer sucker 2 outer surface.The second seal head 42 and the second seal head closing spring 43 is provided with in second vacuum breaker passage 41.One end of second seal head 42 is fixed together with pulling seat 3, the other end is located in the second vacuum breaker passage 41.Second seal head closing spring 43 one end links together with the inner of the second seal head 42, the other end is connected to two with the wall of the second vacuum breaker passage 41.Second vacuum breaker passage 41 seals up for making the second seal head 42 by the second seal head closing spring 43.The opening direction of the second vacuum breaker passage 41 is towards holding plate 1.The absorption end 44 of interior sucker exceeds the absorption end 24 of outer sucker.
Absorption ditch 6 is formed between interior sucker 4 and outer sucker 2.The some elastomeric connector strip 61 outer sucker and interior sucker linked together are provided with in absorption ditch 6.Elastomeric connector strip 61 is along the distribution of outer sucker 2 circumference.Elastomeric connector strip 61 is rubber structure.Elastomeric connector strip 61 and outer sucker 2 are structure as a whole.Elastomeric connector strip 61 is structure as a whole with interior sucker 4.
Pulling seat 3 is provided with elbow 31.Holding plate 1 is provided with same pulling seat and coordinates and in the first vacuum breaker passage, deviate from and limit to limit the first seal head the limiting section 32 that the second seal head deviates from the vacuum breaker passage of place.It is outside that pulling seat 3 is positioned at outer sucker 2.
During use, time outer sucker 2 with carry out extruding after the palm alignment of user thus by outer sucker 2 and interior sucker 4 blackboard eraser is adsorbed on user realize carrying conveniently on hand.Be adsorbed on after on palm by catching holding plate 1 with finger and removing blackboard wiping by cleaning cotton 5, the chalk dust produced during wiping is less in the lower outside amount of raising of the effect of dust cover 7, the chalk dust raised outward is sucked away through suction port 71 under the effect of dust catcher 11, thus avoids chalk dust 4 wheel driven to wave.When needing to take off blackboard eraser from palm, go extrapolation elbow 31 to make the first seal head and the second seal head vacuum breaker passage that all blow-by is firmly corresponding with finger and realize the vacuum breaker of external sucker 2 and interior sucker 4, thus make it possible to take off like a cork, and user when taking off, can not be made to produce sense of discomfort.
Claims (8)
1. a closed blackboard eraser, comprise holding plate, the side of described holding plate is provided with cleaning cotton, it is characterized in that, the opposite side of described holding plate is provided with circular outer sucker, the interior diameter of the absorption end of described outer sucker is less than 3 centimetres, described outer sucker is provided with the first vacuum breaker passage and is positioned at the pulling seat of outer sucker outside, described pulling seat is provided with the first seal head sealing described first vacuum breaker passage, the first seal head closing spring that driving first seal head seals up described first vacuum breaker passage is provided with in described first vacuum breaker passage, described holding plate is provided with the dirt-proof boot being looped around described cleaning cotton outside, described cleaning cotton stretches out described dirt-proof boot, the distance that described cleaning cotton stretches out described dirt-proof boot is less than 3 millimeters.
2. closed blackboard eraser according to claim 1, it is characterized in that, interior sucker is provided with in described outer sucker, described interior sucker is provided with the second vacuum breaker passage extending to outer sucker outer surface, absorption ditch is formed between interior sucker and outer sucker, described pulling seat is also provided with the second seal head sealing described second vacuum breaker passage, is provided with the second seal head closing spring that driving second seal head seals up described second vacuum breaker passage in described second vacuum breaker passage.
3. closed blackboard eraser according to claim 2, is characterized in that, the absorption end of described interior sucker exceeds the absorption end of described outer sucker.
4. the closed blackboard eraser according to Claims 2 or 3, is characterized in that, is provided with the some elastomeric connector strip outer sucker and interior sucker linked together in described absorption ditch, and described elastomeric connector strip is along the distribution of outer sucker circumference.
5. the closed blackboard eraser according to claim 1 or 2 or 3, it is characterized in that, described pulling seat is provided with elbow.
6. the closed blackboard eraser according to claim 1 or 2 or 3, it is characterized in that, the opening direction of the outer end of described first vacuum breaker passage is towards described holding plate, and described holding plate is provided with and coordinates to limit the limiting section that described first seal head is deviate from described first vacuum breaker passage with described pulling seat.
7. the closed blackboard eraser according to claim 1 or 2 or 3, it is characterized in that, the free end of described dirt-proof boot is provided with suction port, is provided with dust catcher in described holding plate, and described suction port is with the inlet communication of described dust catcher.
8. closed blackboard eraser according to claim 7, is characterized in that, described suction port is the annulus extended along the circumference of dirt-proof boot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520381048.1U CN204712744U (en) | 2015-06-05 | 2015-06-05 | Closed blackboard eraser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520381048.1U CN204712744U (en) | 2015-06-05 | 2015-06-05 | Closed blackboard eraser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204712744U true CN204712744U (en) | 2015-10-21 |
Family
ID=54311769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520381048.1U Expired - Fee Related CN204712744U (en) | 2015-06-05 | 2015-06-05 | Closed blackboard eraser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204712744U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109403212A (en) * | 2018-11-08 | 2019-03-01 | 泉州台商投资区华林设计有限公司 | A kind of bridge construction vibreatory hammer |
-
2015
- 2015-06-05 CN CN201520381048.1U patent/CN204712744U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109403212A (en) * | 2018-11-08 | 2019-03-01 | 泉州台商投资区华林设计有限公司 | A kind of bridge construction vibreatory hammer |
| CN109403212B (en) * | 2018-11-08 | 2021-06-01 | 青岛巨源建工集团有限公司 | Vibration pile driver is used in bridge construction |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151021 Termination date: 20160605 |