CN2850949Y - Compasses for blackboard - Google Patents
Compasses for blackboard Download PDFInfo
- Publication number
- CN2850949Y CN2850949Y CN 200520094195 CN200520094195U CN2850949Y CN 2850949 Y CN2850949 Y CN 2850949Y CN 200520094195 CN200520094195 CN 200520094195 CN 200520094195 U CN200520094195 U CN 200520094195U CN 2850949 Y CN2850949 Y CN 2850949Y
- Authority
- CN
- China
- Prior art keywords
- adjusting rod
- blackboard
- compasses
- utility
- model
- 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
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- Drawing Aids And Blackboards (AREA)
Abstract
The utility model relates to a pair of compasses for blackboards, which comprises a supporting frame and an adjusting rod, wherein one end of the adjusting rod is fixed to the top part of the supporting frame, one end of which is fixedly provided with a sucking disc, the center of which is provided with a pointer. The adjusting rod is a device with adjustable length, and the surface of the adjusting rod is provided with length scales. The adjusting rod is provided with a handle. The top part of one end of the adjusting rod away from the supporting frame is sheathed with a chalk clamp. When the utility model is used, the pointer is inserted into a central point by people. The sucking disc is absorbed on the surface of a blackboard and the length of the adjusting rod is adjusted to a radius of a circle to be drawn. Finally, a hand holds the handle for rotating the adjusting rod for drawing patterns of the circle. The utility model has the advantages of convenience, practicability, reasonable structure, beautiful appearance, simple technics, etc. The compasses for blackboards is suitable for being used on the blackboard and can be used for effective fixing and adjusting the lengths of radii.
Description
Technical field the utility model relates to a kind of realia, especially a kind of compasses that are adapted at using on the blackboard.
The technical background compasses are very important drawing instruments, the instructors compasses instruction also commonly used student geometric figure of painting on the classroom.But present educational compasses all has problems, and for example, the compasses pointer is not easy to fix, and perhaps can't regulate radius length or the like, and these problems have had a strong impact on quality of instruction.In order to improve efficiency of teaching, teachers and students are starved of a kind of fixing easily and convenient educational compasses of regulating scale.
The summary of the invention the purpose of this utility model provides a kind of blackboard compasses, is used to solve the problem that common compasses can't use on blackboard.
For achieving the above object, the utility model blackboard compasses comprise bracing frame and adjusting rod, and an end of adjusting rod is vertically fixed on the bracing frame top, and bracing frame is fixed with sucker away from an end of adjusting rod, is provided with pointer in the sucker center; Adjusting rod is the device of adjustable-length, and the surface of adjusting rod is provided with the length scale; Be provided with handle on adjusting rod, adjusting rod is with the chalk folder away from an end top of bracing frame.
After adopting said structure, the user by the pointer on the bracing frame as centre point, then sucker being adsorbed on the blackboard surface fixes, simultaneously adjusting rod is carried out length adjustment, make it equal the radius of circle to be painted, last grip hand-screw modulation pole, the folded chalk of adjusting rod top chalk folder can be left a trace on blackboard, and this vestige is a circle to be painted just.
The utility model has the advantages that: convenient and practical, rational in infrastructure, good looking appearance, technology are simple, and are adapted at using on the blackboard, can effectively fix and regulate radius length, improve the learning efficiency of students, and can save a large amount of drawing times.
Description of drawings Fig. 1 is the overall structure schematic diagram of the utility model blackboard with compasses.
The specific embodiment as shown in Figure 1, the utility model blackboard compasses comprise bracing frame 1 and adjusting rod 2, and an end of adjusting rod 2 is vertically fixed on bracing frame 1 top, bracing frame 1 is fixed with sucker 3 away from an end of adjusting rod 2, is provided with pointer 4 in sucker 3 centers; Adjusting rod 2 is the device of adjustable-length, and the surface of adjusting rod 2 is provided with the length scale; Be provided with handle 5 on adjusting rod 2, adjusting rod 2 is with chalk folder 6 away from an end top of bracing frame 1.When using, the user is inserted in the pointer on the bracing frame 14 on the centre point, then sucker 3 is adsorbed on the blackboard surface to play fixation, simultaneously adjusting rod 2 is carried out length adjustment, make its length equal the radius of circle to be painted, hold handle 5 rotation adjusting rods 2 at last, the adjusting rod 2 top folded chalks of chalk folder are left a trace on blackboard and just are circle to be painted.
Claims (1)
1, a kind of blackboard compasses, comprise bracing frame (1) and adjusting rod (2), one end of adjusting rod (2) is vertically fixed on bracing frame (1) top, it is characterized in that: bracing frame (1) is fixed with sucker (3) away from an end of adjusting rod (2), is provided with pointer (4) in sucker (3) center; Adjusting rod (2) is the device of adjustable-length, and the surface of adjusting rod (2) is provided with the length scale; Be provided with handle (5) on adjusting rod (2), adjusting rod (2) is with chalk folder (6) away from an end top of bracing frame (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520094195 CN2850949Y (en) | 2005-12-08 | 2005-12-08 | Compasses for blackboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520094195 CN2850949Y (en) | 2005-12-08 | 2005-12-08 | Compasses for blackboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2850949Y true CN2850949Y (en) | 2006-12-27 |
Family
ID=37584914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520094195 Expired - Fee Related CN2850949Y (en) | 2005-12-08 | 2005-12-08 | Compasses for blackboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2850949Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107097569A (en) * | 2017-06-20 | 2017-08-29 | 屈雷涛 | One kind teaching picture circle and oval apparatus |
-
2005
- 2005-12-08 CN CN 200520094195 patent/CN2850949Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107097569A (en) * | 2017-06-20 | 2017-08-29 | 屈雷涛 | One kind teaching picture circle and oval apparatus |
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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 |