CN105691042A - Sheath for chalk - Google Patents
Sheath for chalk Download PDFInfo
- Publication number
- CN105691042A CN105691042A CN201610024334.1A CN201610024334A CN105691042A CN 105691042 A CN105691042 A CN 105691042A CN 201610024334 A CN201610024334 A CN 201610024334A CN 105691042 A CN105691042 A CN 105691042A
- Authority
- CN
- China
- Prior art keywords
- extending sleeve
- root
- pedestal
- chalk
- stop bit
- 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
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
Landscapes
- Pens And Brushes (AREA)
Abstract
A sheath for chalk mainly consists of a base, a first extension sleeve and a second extension sleeve, wherein the base is a hollow cylinder with one end opened. By arranging the sheath mainly consisting of the base, as well as the first extension sleeve and the second extension sleeve which are mutually connected in a nesting manner, chalk can be inserted into the sheath from the top tail end of the second extension sleeve, so that direct contact between a hand and the chalk is prevented, and accordingly, pollution of the chalk to the hand is reduced.
Description
Technical field
The present invention relates to the sheath for chalk that a kind of teacher uses in teaching process, belong to the optimisation technique of chalk。
Background technology
Teacher it is frequently necessary to write with chalk on blackboard in teaching process, in writing process, pinch chalk typically by hands to write, chalk dust can stick to your hands, chalk, generally with color, is pinched tighter when writing, and the time pinched is longer, being painted by chalk in the position pinching chalk, the hands cleaning having gone up color is wasted time and energy。
It is, thus, sought for a kind of way that hands and chalk can be made to be not directly contacted with when writing。
Summary of the invention
It is an object of the invention to: a kind of sheath making hands and chalk be not directly contacted with in writing process is provided。
The technical scheme is that a kind of sheath for chalk, mainly it is made up of pedestal the 2, first extending sleeve the 3, second extending sleeve 4, pedestal 2 is the hollow cylinder of one end open, being provided with fixing seat 21 in pedestal endoporus, fixing seat roof is provided with the root with chalk and forms the fixed groove 22 that negative and positive coordinate；First extending sleeve 3 is the hollow cylindrical that two ends are through, inwall at pedestal is provided with two top-down locating slots 23 of symmetry, accordingly, root at the first extending sleeve 3 is externally provided with two the first locator protrusions 31 outwardly, the first locator protrusions 31 on the first extending sleeve 3 be directed on pedestal 2 locating slot 23, again the first extending sleeve is pressed downward against, two the first locator protrusions respectively enter a locating slot, under the effect of external force, the first extending sleeve moves up or down in pedestal along locating slot；It is provided with to the stop bit of inner process raised 24 in the exit of locating slot, stop bit projection end face upward is to the central axis direction of pedestal downward-sloping lead-in curve from the root of stop bit projection, the lower surface of described stop bit projection is plane, accordingly, the upper surface that the lower surface of the first locator protrusions 31 of the first extending sleeve 3 is the stop bit projection 24 with pedestal 2 forms the lead-in curve coordinated, and the upper surface of the first locator protrusions 31 of the first extending sleeve 3 is plane；Inwall at the first extending sleeve 3 is provided with two top-down first locating slots 32 of symmetry, accordingly, root at the second extending sleeve 4 is externally provided with two the second locator protrusions 41 outwardly, the second locator protrusions on second extending sleeve is directed at the first locating slot on the first extending sleeve, again the second extending sleeve is pressed downward against, two the second locator protrusions respectively enter first locating slot, and under the effect of external force, the second extending sleeve moves up or down in the first extending sleeve along the first locating slot；It is provided with the first stop bit raised 33 to inner process near the position of outlet at the first locating slot, first stop bit projection end face upward is to the central axis direction of pedestal downward-sloping lead-in curve from the root of stop bit projection, the lower surface of the first described stop bit projection is plane, accordingly, the upper surface that the lower surface of the second locator protrusions 41 of the second extending sleeve 4 is the first stop bit projection 33 with the first extending sleeve 3 forms the lead-in curve coordinated, and the upper surface of the second locator protrusions 41 of the second extending sleeve 4 is plane；Chalk 1 is pressed root and is inserted from the end of the second extending sleeve towards the mode of fixed groove, until chalk root enters in fixed groove fixing。
The diameter of bore of the first extending sleeve is more than the second extending sleeve root diameter (RD), root at the first extending sleeve endoporus is provided with the circle bead protruded inwardly from, the diameter of bore of bead is less than the second extending sleeve root diameter (RD), when in the bead that the root of the second extending sleeve is against the first extending sleeve root, the top end of the second extending sleeve is positioned at outside the first extending sleeve。
When the root of the first extending sleeve props up the diapire of pedestal endoporus, the top end of the first extending sleeve is positioned at outside pedestal。
The first described extending sleeve and the second extending sleeve are the up-small and down-big taper identical with chalk profile。
Described sheath also includes top cover 5, and top cover 5 is enclosed within the end of chalk, and the root of top cover and the second extending sleeve connect away from end fit or the spiral of pedestal。
Beneficial effect
1, by arranging the sheath being mainly made up of pedestal and the first connected extending sleeve nested against one another and the second extending sleeve, chalk is inserted in sheath from the top end of the second extending sleeve, it is possible to make hands directly not contact with chalk, decrease the pollution of chalk opponent。
Accompanying drawing explanation
Fig. 1 is the three-dimensional appearance schematic diagram of the present invention；
Fig. 2 is the three-dimensional appearance schematic diagram after the present invention opens top cover；
Fig. 3 is the explosive view of the present invention；
Fig. 4 is the cross-sectional view of the present invention；
Fig. 5 is the cross-sectional view after the present invention opens top cover；
Fig. 6 is the cross-sectional view of the pedestal of the present invention；
Fig. 7 is the cross-sectional view of first extending sleeve of the present invention；
Fig. 8 is the cross-sectional view of second extending sleeve of the present invention。
Detailed description of the invention
As Figure 1-Figure 8, a kind of sheath for chalk, mainly it is made up of pedestal the 2, first extending sleeve 3 and the second extending sleeve 4。
Pedestal 2 is the hollow cylinder of one end open, is provided with the fixing seat 21 of cylinder upwardly in base bottom wall, and fixing seat roof is provided with the root with chalk and forms the fixed groove 22 that negative and positive coordinate, and the root of chalk inserts in fixed groove 22 fixing。Fix and leave a circle space between seat and pedestal for holding the first extending sleeve。
Inwall at pedestal is provided with two top-down locating slots 23 of symmetry, accordingly, root at the first extending sleeve 3 is externally provided with two the first locator protrusions 31 outwardly, the first locator protrusions 31 on the first extending sleeve 3 be directed on pedestal 2 locating slot 23, again the first extending sleeve is pressed downward against, two the first locator protrusions respectively enter a locating slot, and under the effect of external force, the first extending sleeve moves up or down in pedestal along locating slot。Enter locating slot by the first locator protrusions, make the first extending sleeve will not rotate in pedestal, it is prevented that owing to the first extending sleeve Effect of Rotation in pedestal is write in writing process。
It is provided with to the stop bit of inner process raised 24 in the exit of locating slot, stop bit projection end face upward is to the central axis direction of pedestal downward-sloping lead-in curve from the root of stop bit projection, the lower surface of described stop bit projection is plane, accordingly, the upper surface that the lower surface of the first locator protrusions 31 of the first extending sleeve 3 is the stop bit projection 24 with pedestal 2 forms the lead-in curve coordinated, and the upper surface of the first locator protrusions 31 of the first extending sleeve 3 is plane。When the first extending sleeve is pressed into pedestal, the lower surface of the first locator protrusions contacts with the upper surface of the stop bit projection on the locating slot of pedestal, under the effect of external force, first locator protrusions is forced into the lower section of stop bit projection, when having external force to when lifting up the first extending sleeve, owing to the upper surface of the first locator protrusions is stuck in the lower section of pedestal stop bit projection, therefore, first extending sleeve cannot be completely pulled out in pedestal, when can only move the stop bit projection that the first locator protrusions withstands pedestal to。Pedestal, the first extending sleeve, the second extending sleeve generally adopt rigid plastics or metal material to make, during assembling, first extending sleeve is intrinsic pressure to pedestal, the stop bit projection of pedestal has certain guiding function, add material and there is certain elasticity, it becomes possible to the first locator protrusions is pressed onto below the stop bit projection of pedestal and realizes assembling。
Inwall at the first extending sleeve 3 is provided with two top-down first locating slots 32 of symmetry, accordingly, root at the second extending sleeve 4 is externally provided with two the second locator protrusions 41 outwardly, the second locator protrusions on second extending sleeve is directed at the first locating slot on the first extending sleeve, again the second extending sleeve is pressed downward against, two the second locator protrusions respectively enter first locating slot, and under the effect of external force, the second extending sleeve moves up or down in the first extending sleeve along the first locating slot。
It is provided with the first stop bit raised 33 to inner process near the position of outlet at the first locating slot, first stop bit projection end face upward is to the central axis direction of pedestal downward-sloping lead-in curve from the root of stop bit projection, the lower surface of the first described stop bit projection is plane, accordingly, the upper surface that the lower surface of the second locator protrusions 41 of the second extending sleeve 4 is the first stop bit projection 33 with the first extending sleeve 3 forms the lead-in curve coordinated, and the upper surface of the second locator protrusions 41 of the second extending sleeve 4 is plane。The same with the relation of the first extending sleeve and pedestal, when the second extending sleeve also can only be moved to, by external force, the lower surface that stop bit projection in the first extending sleeve is withstood in the upper surface of the second locator protrusions。
Chalk is pressed root and is inserted from the end of the second extending sleeve towards the mode of fixed groove, until chalk root enters in fixed groove fixing。
The diameter of bore of the first extending sleeve is more than the second extending sleeve root diameter (RD), root at the first extending sleeve endoporus is provided with the circle bead protruded inwardly from, the diameter of bore of bead is less than the second extending sleeve root diameter (RD), when in the bead that the root of the second extending sleeve is against the first extending sleeve root, the top end of the second extending sleeve is positioned at outside the first extending sleeve。
When the root of the first extending sleeve props up the diapire of pedestal endoporus, the top end of the first extending sleeve is positioned at outside pedestal。
The first described extending sleeve and the second extending sleeve are the up-small and down-big taper identical with chalk profile。
Described sheath also includes top cover 5, and top cover 5 is enclosed within the end of chalk, and the root of top cover and the second extending sleeve connect away from end fit or the spiral of pedestal。Top cover 5 is connected with the end of the second extending sleeve, thus protecting the end of chalk。
During use, open top cover and expose the end of chalk, along with the continuation write, the end of chalk is fewer and fewerily exposed, by the second extending sleeve is intrinsic pressure to the first extending sleeve, just can expose chalk one section new for writing, along with the continuation write, when first extending sleeve can not be pressed still further below, second extending sleeve is intrinsic pressure to pedestal, chalk one section new can be exposed again for writing, until being pressed onto after the second extending sleeve can not press still further below, when exposed chalk very short be no longer appropriate for for writing time, remaining chalk is extracted, again change a new chalk to insert, again the second extending sleeve is pulled away from pedestal, again the first extending sleeve is pulled away from the second extending sleeve, exposed chalk can be write again。
Usual chalk is cone, has had outside the sheath of the present invention, moreover it is possible to directly make cylinder, and accordingly, pedestal, the first extending sleeve and the second extending sleeve also make cylinder。For convenience of gripping, the outer wall at the first extending sleeve and the second extending sleeve is arranged can lug, nib laterally or longitudinally or intensive projection that some are little。
Above-described embodiment is intended merely to the purposes of the interpretation present invention, and is not limitation of the present invention, and those skilled in the art in the essential scope of the present invention, make a variety of changes or substitute, also should belong to the protection category of the present invention。
Claims (5)
1. the sheath for chalk, it is characterized in that: be mainly made up of pedestal (2), the first extending sleeve (3), the second extending sleeve (4), the hollow cylinder that pedestal (2) is one end open, being provided with fixing seat (21) in pedestal endoporus, fixing seat roof is provided with the root with chalk and forms the fixed groove (22) that negative and positive coordinate；First extending sleeve (3) is the through hollow cylindrical in two ends, inwall at pedestal is provided with two top-down locating slots (23) of symmetry, accordingly, root at the first extending sleeve (3) is externally provided with two the first locator protrusions (31) outwardly, the locating slot (23) of (2) on the first locator protrusions (31) the alignment pedestal on the first extending sleeve (3), again the first extending sleeve is pressed downward against, two the first locator protrusions respectively enter a locating slot, under the effect of external force, first extending sleeve moves up or down in pedestal along locating slot；It is provided with to the stop bit of inner process raised (24) in the exit of locating slot, stop bit projection end face upward is to the central axis direction of pedestal downward-sloping lead-in curve from the root of stop bit projection, the lower surface of described stop bit projection is plane, accordingly, the upper surface that the lower surface of first locator protrusions (31) of the first extending sleeve (3) is the stop bit projection (24) with pedestal (2) forms the lead-in curve coordinated, and the upper surface of first locator protrusions (31) of the first extending sleeve (3) is plane；Inwall at the first extending sleeve (3) is provided with two top-down first locating slots (32) of symmetry, accordingly, root at the second extending sleeve (4) is externally provided with two the second locator protrusions (41) outwardly, the second locator protrusions on second extending sleeve is directed at the first locating slot on the first extending sleeve, again the second extending sleeve is pressed downward against, two the second locator protrusions respectively enter first locating slot, under the effect of external force, the second extending sleeve moves up or down in the first extending sleeve along the first locating slot；It is provided with to the first stop bit of inner process raised (33) at the first locating slot near the position of outlet, first stop bit projection end face upward is to the central axis direction of pedestal downward-sloping lead-in curve from the root of stop bit projection, the lower surface of the first described stop bit projection is plane, accordingly, the upper surface that the lower surface of second locator protrusions (41) of the second extending sleeve (4) is the first stop bit projection (33) with the first extending sleeve (3) forms the lead-in curve coordinated, the upper surface of second locator protrusions (41) of the second extending sleeve (4) is plane；Chalk (1) is pressed root and is inserted from the end of the second extending sleeve towards the mode of fixed groove, until chalk root enters in fixed groove fixing。
2. the sheath for chalk according to claim 1, it is characterized in that: the diameter of bore of the first extending sleeve is more than the second extending sleeve root diameter (RD), root at the first extending sleeve endoporus is provided with the circle bead protruded inwardly from, the diameter of bore of bead is less than the second extending sleeve root diameter (RD), when in the bead that the root of the second extending sleeve is against the first extending sleeve root, the top end of the second extending sleeve is positioned at outside the first extending sleeve。
3. the sheath for chalk according to claim 1, it is characterised in that: when the root of the first extending sleeve props up the diapire of pedestal endoporus, the top end of the first extending sleeve is positioned at outside pedestal。
4. the sheath for chalk according to claim 1, it is characterised in that: the first described extending sleeve and the second extending sleeve are the up-small and down-big taper identical with chalk profile。
5. the sheath for chalk according to claim 1, it is characterized in that: described sheath also includes top cover (5), top cover (5) is enclosed within the end of chalk, and the root of top cover and the second extending sleeve connect away from end fit or the spiral of pedestal。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610024334.1A CN105691042A (en) | 2016-01-13 | 2016-01-13 | Sheath for chalk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610024334.1A CN105691042A (en) | 2016-01-13 | 2016-01-13 | Sheath for chalk |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105691042A true CN105691042A (en) | 2016-06-22 |
Family
ID=56227348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610024334.1A Pending CN105691042A (en) | 2016-01-13 | 2016-01-13 | Sheath for chalk |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105691042A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203902035U (en) * | 2014-05-28 | 2014-10-29 | 山西机电职业技术学院 | Chalk sleeve |
| CN105196741A (en) * | 2015-10-02 | 2015-12-30 | 刘乐凝 | Chalk with protecting bushes |
-
2016
- 2016-01-13 CN CN201610024334.1A patent/CN105691042A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203902035U (en) * | 2014-05-28 | 2014-10-29 | 山西机电职业技术学院 | Chalk sleeve |
| CN105196741A (en) * | 2015-10-02 | 2015-12-30 | 刘乐凝 | Chalk with protecting bushes |
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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 |
Application publication date: 20160622 |
|
| WD01 | Invention patent application deemed withdrawn after publication |