CN105150718A - Chalk auxiliary writing device - Google Patents
Chalk auxiliary writing device Download PDFInfo
- Publication number
- CN105150718A CN105150718A CN201510576393.5A CN201510576393A CN105150718A CN 105150718 A CN105150718 A CN 105150718A CN 201510576393 A CN201510576393 A CN 201510576393A CN 105150718 A CN105150718 A CN 105150718A
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- CN
- China
- Prior art keywords
- chalk
- support portion
- push rod
- writing device
- internal diameter
- 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.)
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- Drawing Aids And Blackboards (AREA)
Abstract
The invention discloses a chalk auxiliary writing device which comprises a sleeve body and a push rod. The sleeve body is meshed with the push rod through threads, one end of the sleeve body is provided with a supporting part, the internal diameter of the supporting part is smaller than the threaded internal diameter of the sleeve body and is in transition fit with the external diameter of chalk, one end of the push rod close to the supporting part is provided with a clamping inner hole, and the internal diameter of the clamping inner hole is in interference fit with the tail end of the chalk. The chalk auxiliary writing device has reliability in clamping, is not subjected to blockage, does not need to be cleaned, and has the advantages of being simple in structure, easy to manufacture, low in cost and very convenient to use.
Description
Technical field
The present invention relates to educational aid technical field, refer to that writing device assisted by a kind of chalk especially.
Background technology
Patent " environmentally-friendly chalk holder " (patent No.: ZL201220692598.1) discloses a kind of environmentally-friendly chalk holder, this environmentally-friendly chalk holder allows the hand of teacher no longer be subject to the pollution of chalk substantially, but due to its reasons in structure, chucking power is still existed for last 2-3 centimetre of only surplus chalk little, the problem that when writing, chalk easily drops, and the external diameter of chalk directly contacts with the internal thread of body, internal thread is easily caused to scrape wiping chalk, and the chalk dust scraped easily causes internal thread to block, resistance is defined to the precession of push rod, once blocking, cleaning will be taken apart, it is very inconvenient to use.
Summary of the invention
The problem to be solved in the present invention is the deficiency overcome in background technology, and provide a kind of chalk to assist writing device, writing device assisted by this chalk, and compared to existing technology, clamping is reliable, does not block, also need not clean, use very convenient.
For solving the problem, the present invention takes following technical scheme:
Writing device assisted by a kind of chalk of the present invention, comprise body and push rod, described body and push rod adopt screw-threaded engagement, one end of described body is provided with support portion, the internal diameter of described support portion is less than the bottom diameter of body, the internal diameter of described support portion becomes interference fits with the external diameter of chalk, and one end that described push rod is close with support portion is provided with clamping endoporus, and the internal diameter of described clamping endoporus becomes interference fit with the external diameter of chalk end.
Further, the periphery of described support portion is processed into the conical surface.
Further, the cross section of described support portion is tooth-shape structure.
Further, the inside of described push rod is processed with through hole.
Compared to prior art, the beneficial effect that the present invention has is:
Writing device assisted by a kind of chalk of the present invention, support portion is provided with in one end of body, the internal diameter of described support portion is less than the bottom diameter of body, the internal diameter of described support portion becomes interference fits with the external diameter of chalk, guarantee that chalk does not contact with the internal thread of body, prevent internal thread from scraping wiping chalk, stop internal thread blocking, and chalk and support portion can easily relative movements, make the spinning in and out of push rod also become very light; One end close with support portion at push rod is provided with clamping endoporus, the internal diameter of described clamping endoporus becomes interference fit with the external diameter of chalk end, when installing chalk, can slightly exert oneself chalk end to push clamping endoporus, just can guarantee that chalk is grasped tightly on push rod, chalk then can not drop.
The periphery of support portion is processed into the conical surface, and when being convenient to write, body and blackboard are not interfered mutually, use chalk as far as possible, do not waste; The Cross section Design of support portion is become tooth-shape structure, is convenient to discharge the inner chalk dust that may exist of body; At the inside of push rod processing through hole, its Main Function is when chalk not easily takes out, and is ejected by chalk by through hole.
Writing device assisted by a kind of chalk of the present invention, also has structure simple, easily manufactures, cost is low, use the advantages such as very convenient.
Accompanying drawing explanation
Fig. 1 is sectional structure schematic diagram of the present invention.
Fig. 2 is that the A of Fig. 1 is to schematic diagram.
Detailed description of the invention
As depicted in figs. 1 and 2, writing device assisted by a kind of chalk of the present invention, comprise body 1 and push rod 2, described body 1 and push rod 2 adopt screw-threaded engagement, one end of described body 1 is provided with support portion 11, and the internal diameter of described support portion 11 is less than the bottom diameter of body 1, and the internal diameter of described support portion 11 becomes interference fits with the external diameter of chalk 3, one end that described push rod 2 is close with support portion 11 is provided with and clamps endoporus 21, and the internal diameter of described clamping endoporus 21 becomes interference fit with the external diameter of chalk 3 end.
The periphery of described support portion 11 is processed into the conical surface 12.
The cross section of described support portion 11 is tooth-shape structure.
The inside of described push rod 2 is processed with through hole.
Writing device assisted by a kind of chalk of the present invention, support portion 11 is provided with in one end of body 1, the internal diameter of described support portion 11 is less than the bottom diameter of body 1, the internal diameter of described support portion 11 becomes interference fits with the external diameter of chalk 3, guarantee that chalk 3 does not contact with the internal thread of body 1, prevent internal thread from scraping wiping chalk 3, stop internal thread blocking, and chalk 3 and support portion 11 can easily relative movements, make the spinning in and out of push rod 2 also become very light; Be provided with in one end that push rod 2 is close with support portion 11 and clamp endoporus 21, the internal diameter of described clamping endoporus 21 becomes interference fit with the external diameter of chalk 3 end, when chalk 3 is installed, can slightly exert oneself chalk 3 end to be pushed clamping endoporus 21, just can guarantee that chalk 3 is clamped on push rod firmly, 3, chalk can not drop.
The periphery of support portion 11 is processed into the conical surface 12, and when being convenient to write, body 1 and blackboard are not interfered mutually, use chalk 3 as far as possible, do not waste; The Cross section Design of support portion 11 is become tooth-shape structure, is convenient to the chalk dust that discharge body 1 inside may exist; At the inside of push rod 2 processing through hole, its Main Function is when chalk 3 not easily takes out, and is ejected by chalk 3 by through hole.
Writing device assisted by a kind of chalk of the present invention, also has structure simple, easily manufactures, cost is low, use the advantages such as very convenient.
Should be noted that; the foregoing is only the preferred embodiments of the present invention, be not limited to the present embodiment, within the spirit and principles in the present invention all; any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. writing device assisted by a chalk, comprise body (1) and push rod (2), described body (1) and push rod (2) adopt screw-threaded engagement, it is characterized in that: one end of described body (1) is provided with support portion (11), the internal diameter of described support portion (11) is less than the bottom diameter of body (1), the internal diameter of described support portion (11) becomes interference fits with the external diameter of chalk (3), one end that described push rod (2) is close with support portion (11) is provided with and clamps endoporus (21), the internal diameter of described clamping endoporus (21) becomes interference fit with the external diameter of chalk (3) end.
2. writing device assisted by a kind of chalk according to claim 1, it is characterized in that: the periphery of described support portion (11) is processed into the conical surface (12).
3. writing device assisted by a kind of chalk according to claim 1, it is characterized in that: the cross section of described support portion (11) is tooth-shape structure.
4. writing device assisted by a kind of chalk according to claim 1, it is characterized in that: the inside of described push rod (2) is processed with through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510576393.5A CN105150718A (en) | 2015-09-11 | 2015-09-11 | Chalk auxiliary writing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510576393.5A CN105150718A (en) | 2015-09-11 | 2015-09-11 | Chalk auxiliary writing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105150718A true CN105150718A (en) | 2015-12-16 |
Family
ID=54791892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510576393.5A Pending CN105150718A (en) | 2015-09-11 | 2015-09-11 | Chalk auxiliary writing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105150718A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04310800A (en) * | 1991-04-10 | 1992-11-02 | Kotobuki:Kk | Rod like material drawing out container |
| CN2188489Y (en) * | 1994-04-14 | 1995-02-01 | 魏隆诚 | Writing chalk on blackboard |
| CN2226527Y (en) * | 1995-08-29 | 1996-05-08 | 赵交生 | Spiral holder for chalks |
| CN201154602Y (en) * | 2008-02-26 | 2008-11-26 | 上海市松江二中 | Chalk holder device |
| JP2012005526A (en) * | 2010-06-22 | 2012-01-12 | Tokiwa Corp | Coating material extruding container |
| CN205058941U (en) * | 2015-09-11 | 2016-03-02 | 无锡市翱宇特新科技发展有限公司 | Supplementary device of writing of chalk |
-
2015
- 2015-09-11 CN CN201510576393.5A patent/CN105150718A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04310800A (en) * | 1991-04-10 | 1992-11-02 | Kotobuki:Kk | Rod like material drawing out container |
| CN2188489Y (en) * | 1994-04-14 | 1995-02-01 | 魏隆诚 | Writing chalk on blackboard |
| CN2226527Y (en) * | 1995-08-29 | 1996-05-08 | 赵交生 | Spiral holder for chalks |
| CN201154602Y (en) * | 2008-02-26 | 2008-11-26 | 上海市松江二中 | Chalk holder device |
| JP2012005526A (en) * | 2010-06-22 | 2012-01-12 | Tokiwa Corp | Coating material extruding container |
| CN205058941U (en) * | 2015-09-11 | 2016-03-02 | 无锡市翱宇特新科技发展有限公司 | Supplementary device of writing of chalk |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151216 |