CN2447878Y - Teaching compasses - Google Patents
Teaching compasses Download PDFInfo
- Publication number
- CN2447878Y CN2447878Y CN 99251124 CN99251124U CN2447878Y CN 2447878 Y CN2447878 Y CN 2447878Y CN 99251124 CN99251124 CN 99251124 CN 99251124 U CN99251124 U CN 99251124U CN 2447878 Y CN2447878 Y CN 2447878Y
- Authority
- CN
- China
- Prior art keywords
- compasses
- length
- timber
- educational compasses
- utility
- 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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- Electrically Operated Instructional Devices (AREA)
Abstract
The utility model relates to a pair of teaching compasses. The length of the existing teaching compasses is improved, the length of a wood part is changed to only half 20 cm as large as the length of a pair of common compasses, and the length of the integral compasses is only 25 cm. Use is more convenient and flexible, one of raw materials-wood is saved in production, and production cost is reduced.
Description
The utility model is the improvement to existing educational compasses length
At present, known educational compasses is by the timber part, and gib screw, needle point, chalk sleeve are formed, and total length is more than 50cm, and greater than the length of common people's arm forearm, teaching practice is found for many years, uses inconvenience, owes flexible.
The purpose of this utility model is that the length of existing educational compasses is improved, make its use more flexibly, convenient, and save timber, but do not influence the drawn big or small effect that goes out figure.
The purpose of this utility model is achieved in that by in the criminal investigation, judgement is committed suiside with rifle and homicide is the principle of judging according to the length of arm forearm, the timber of existing educational compasses partly is made into has only 20cm long, keep the parts such as gib screw, needle point and chalk sleeve of existing educational compasses.The length that makes whole educational compasses slightly is shorter than the forearm of human arm at 25cm, reaches to use more convenient and flexible purpose, and save timber in producing---and one of former material reduces production costs.
Owing to adopt above scheme, can be in use convenient flexibly, but do not influence result of use, and reduce production costs when producing.
Below in conjunction with accompanying drawing the utility model is further specified:
1,2 timber parts among the figure.3, gib screw, the size of loosening scalable compasses bipod angle.4, chalk sleeve, the circles that can draw such as chalk of packing into.5 needle points are determined home position.
In accompanying drawing, it is long by figure timber partly to be made 20cm during production, and it is long that chalk sleeve is made 2cm, and it is long that needle point is made 5cm, is assembled into the educational compasses that total length is 25cm.
Claims (1)
- A kind of educational compasses, by the fixing timber part of gib screw, one of the bipod of timber part is loaded onto chalk sleeve, and load onto needle point, it is characterized in that for one: each long 20cm of timber part bipod, whole compasses length is 25cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99251124 CN2447878Y (en) | 1999-10-13 | 1999-10-13 | Teaching compasses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99251124 CN2447878Y (en) | 1999-10-13 | 1999-10-13 | Teaching compasses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2447878Y true CN2447878Y (en) | 2001-09-12 |
Family
ID=34035690
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99251124 Expired - Fee Related CN2447878Y (en) | 1999-10-13 | 1999-10-13 | Teaching compasses |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2447878Y (en) |
-
1999
- 1999-10-13 CN CN 99251124 patent/CN2447878Y/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 | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |