CN204249650U - Writing on the blackboard Portable compass - Google Patents
Writing on the blackboard Portable compass Download PDFInfo
- Publication number
- CN204249650U CN204249650U CN201420661781.4U CN201420661781U CN204249650U CN 204249650 U CN204249650 U CN 204249650U CN 201420661781 U CN201420661781 U CN 201420661781U CN 204249650 U CN204249650 U CN 204249650U
- Authority
- CN
- China
- Prior art keywords
- blackboard
- writing
- handgrip
- straight
- bar
- 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
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- Drawing Aids And Blackboards (AREA)
Abstract
Writing on the blackboard Portable compass of the present utility model belongs to teaching aid field, by sucker, handgrip, straight-bar, change, trip block composition, sucker convex surface circle centre position is even equipped with vertical handgrip, and straight-bar one end connects is equipped with change, change is active to be sleeved on handgrip, actively on straight-bar be installed with trip block, trip block have screwing through hole and chalk jack, is screwed with screw respectively and is inserted with chalk.This writing on the blackboard Portable compass can make home position stablize, and freely, writing on the blackboard is convenient, favourable teaching in radius conversion.
Description
Technical field
Writing on the blackboard Portable compass of the present utility model belongs to teaching aid field, particularly relates to a kind of educational compasses for writing on the blackboard.
Background technology
Along with constantly improving of teaching facilities is improved, the blackboard in classroom is also more and more modern, and when the blackboard of flat smooth makes writing on the blackboard geometry teaching circular, a pin of compasses is difficult to location, causes picture circle not easily, impact teaching.
Summary of the invention
The purpose of this utility model is to provide one that home position can be made to stablize, radius conversion writing on the blackboard Portable compass freely.
The purpose of this utility model is achieved in that writing on the blackboard Portable compass is by sucker, handgrip, straight-bar, change, trip block composition, sucker convex surface circle centre position is even equipped with vertical handgrip, straight-bar one end connects is equipped with change, and change is active to be sleeved on handgrip, actively on straight-bar is installed with trip block, trip block has screwing through hole and chalk jack, is screwed with screw respectively and is inserted with chalk.
Owing to carrying out technique scheme, this writing on the blackboard Portable compass can make home position stablize, and freely, writing on the blackboard is convenient, favourable teaching in radius conversion.
Accompanying drawing illustrates: the technical solution of the utility model is provided by following drawings and Examples:
Fig. 1 is writing on the blackboard Portable compass structural representation.
Legend: 1, screw, 2, straight-bar, 3, handgrip, 4, change, 5, sucker, 6, trip block.
Detailed description of the invention:
The utility model by the restriction of following embodiment, can not determine concrete embodiment according to the technical solution of the utility model and actual conditions.
Embodiment: as shown in Figure 1, writing on the blackboard with Portable compass writing on the blackboard by sucker 5, handgrip 3, straight-bar 2, change 4, trip block 6 forms, sucker 5 convex surface circle centre position is even equipped with vertical handgrip 3, straight-bar 2 one end connects is equipped with change 4, and change 4 is active to be sleeved on handgrip 3, and on straight-bar 2, active being installed with swims block 6, the top of trip block 6 has screwing through hole, be screwed with screw 1, bottom has chalk jack, is inserted with chalk.
Improve further as the application, described handgrip 3 has an enlarged head, and described enlarged head is spheroidal, and described spheroidal offers through hole, and in described through hole, there is stay cord in system, and in stay cord rear end, there is sleeve in system, and chalk is pluggable in sleeve.
During writing on the blackboard, press handgrip 3 down, sucker 5 is inhaled preposition on blackboard, unclamp screw 1, trip block 6 that straight-bar 2 slides, to the radius length of setting, tightens screw 1, pinning handgrip 3 on the other hand catches trip block 6 to slip over a circle on the other hand, and chalk can draw the circle of standard on blackboard.In field research, the chalk connected by stay cord, fixedly can draw the circle substantially of a constant-radius, then is drawn and substantially round concentric concentric circles by the chalk of swimming block 6 place, the concentric circles under teacher can be facilitated like this to draw outstanding situation fast.The change of basic radius of circle only needs to regulate pulling rope length.
Above technical characteristic constitutes most preferred embodiment of the present utility model, and it has stronger adaptability and best implementation result, can increase and decrease inessential technical characteristic according to actual needs, meet the needs of different situations.
Claims (3)
1. a writing on the blackboard Portable compass, by sucker, handgrip, straight-bar, change, trip block composition, is characterized in that: sucker convex surface circle centre position connects vertical handgrip is housed, and straight-bar one end connects is equipped with change, and change is active to be sleeved on handgrip, actively on straight-bar is installed with trip block.
2. writing on the blackboard Portable compass as claimed in claim 1, is characterized in that: trip block has screwing through hole and chalk jack, is screwed with screw respectively and is inserted with chalk.
3. writing on the blackboard Portable compass as claimed in claim 1, it is characterized in that: described handgrip has an enlarged head, described enlarged head is spheroidal, described spheroidal offers through hole, in described through hole, there is stay cord in system, and in stay cord rear end, there is sleeve in system, and chalk is pluggable in sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420661781.4U CN204249650U (en) | 2014-11-07 | 2014-11-07 | Writing on the blackboard Portable compass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420661781.4U CN204249650U (en) | 2014-11-07 | 2014-11-07 | Writing on the blackboard Portable compass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204249650U true CN204249650U (en) | 2015-04-08 |
Family
ID=52953991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420661781.4U Expired - Fee Related CN204249650U (en) | 2014-11-07 | 2014-11-07 | Writing on the blackboard Portable compass |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204249650U (en) |
-
2014
- 2014-11-07 CN CN201420661781.4U patent/CN204249650U/en not_active Expired - Fee Related
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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: 20150408 Termination date: 20161107 |