CN2614931Y - Compasses - Google Patents
Compasses Download PDFInfo
- Publication number
- CN2614931Y CN2614931Y CN 03215088 CN03215088U CN2614931Y CN 2614931 Y CN2614931 Y CN 2614931Y CN 03215088 CN03215088 CN 03215088 CN 03215088 U CN03215088 U CN 03215088U CN 2614931 Y CN2614931 Y CN 2614931Y
- Authority
- CN
- China
- Prior art keywords
- compasses
- rotary body
- sway brace
- static
- angle
- 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
- 230000003068 static effect Effects 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
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Abstract
The utility model relates to a teaching aid, especially a compasses. The chalk sleeve comprises a movable arm 1 and a supporting arm 2, wherein a chalk sleeve 3 is arranged at the lower end of the movable arm 1, and an angle controller 4 is arranged at the lower end of the supporting arm 2. The utility model has the advantages of simple structure, easy operation and convenient use.
Description
Affiliated field:
The utility model relates to a kind of teaching aid, especially a kind of compasses.
Background technology:
Up to now, the compasses structure used in the classroom of teacher is generally two rule arms.Wherein, the lower end of a rule arm is embedded with chalk sleeve, and the lower end of another rule arm is fixed with the metal needle body.In use in the classroom, adopt the metal needle body to determine the method for round dot, the circular arc of the various different radians that draw or circle.Because traditional compasses can not be made the circular arc of a certain definite angle, and drawing circular arc or bowlder, between metal needle body and the blackboard relative turn can take place, easily depart from the center of circle, so traditional round programming figure is being not easy to operate.
Summary of the invention:
The purpose of this utility model provides a kind of simple in structure, and is easy to operate, compasses easy to use.
The utility model is that the technical scheme of finishing the employing of foregoing invention purpose is: it comprises lever arm 1 and sway brace 2, and the lower end of lever arm 1 is provided with chalk sleeve 3, and the lower end of sway brace 2 is provided with angle controller 4.Angle controller 4 comprises static 5, and static 5 flexibly connects with rotary body 9 by sealing screw 8, and rotary body 9 is fixedly mounted on the bottom of sway brace 2, static 5 the lower end metal needle body 6 that is threaded.The outside of rotary body 9 is provided with angle line 10, and static 5 the outside is provided with one group of initial line 7.
The utility model adopts and in the lower end of sway brace 2 angle controller 4 is set, make teacher when drawing, can draw the as required circular arc or the circle of different angles, it is more convenient that teacher is given lessons, the picture quality is higher, more easy to operate, since static 5 with rotary body 9 between flexibly connect by sealing screw 8, so can keep the metal needle body 6 and blackboard relative fixed of static 5 lower end, the maintenance center of circle is constant.
Description of drawings:
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the structural representation of angle rotor 4 shown in Figure 1.
Fig. 3 is the diagrammatic cross-section of angle rotor 4 shown in Figure 2.
Embodiment:
As shown in FIG., it comprises lever arm 1 and sway brace 2, and the lower end of lever arm 1 is provided with chalk sleeve 3, and the lower end of sway brace 2 is provided with angle controller 4.Angle controller 4 comprises static 5, and static 5 flexibly connects with rotary body 9 by sealing screw 8, and rotary body 9 is socketed in the bottom of sway brace 2, static 5 the lower end metal needle body 6 that is threaded.The outside of rotary body 9 is provided with angle line 10, and static 5 the outside is provided with one group of initial line 7.Initial line 7 can be 4, also can be 8.
During use, two compasses arm tops of the hand-held compasses of operator, have gentle hands is gently rotated static 5, its any initial line 7 and the angle line 10 of rotary body 9 is aligned, as the starting point of drawing circular arc.Then,, determine round dot thus, and be radius, picture circular arc or circle with the distance between the chalk in metal needle body 6 and the chalk sleeve 3 with metal needle body 6 contact blackboards.In drawing circular arc or circle process, lever arm 1, sway brace 2 and rotary body 9 are done the circular arc rotation, and static 5 do not rotate all the time.The pairing angle value of circular arc is then determined by the difference between angle line 10 and the initial line 7.The utility model is not auspicious to be stated part and is known technology.
Claims (3)
1, a kind of compasses, it comprises lever arm (1) and sway brace (2), the lower end of lever arm (1) is provided with chalk sleeve (3), it is characterized in that: be provided with angle controller (4) in the lower end of sway brace (2).
2, a kind of compasses according to claim 1, it is characterized in that: described angle controller (4) comprises static head (5), static head (5) flexibly connects with rotary body (9) by sealing screw (8), rotary body (9) is fixedly mounted on the bottom of sway brace (2), the lower end of static head (5) the metal needle body (6) that is threaded.
3, a kind of compasses according to claim 2 is characterized in that: the outside of described rotary body (9) is provided with angle line (10), and the outside of static head (5) is provided with one group of initial line (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03215088 CN2614931Y (en) | 2003-02-18 | 2003-02-18 | Compasses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03215088 CN2614931Y (en) | 2003-02-18 | 2003-02-18 | Compasses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2614931Y true CN2614931Y (en) | 2004-05-12 |
Family
ID=34242688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03215088 Expired - Fee Related CN2614931Y (en) | 2003-02-18 | 2003-02-18 | Compasses |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2614931Y (en) |
-
2003
- 2003-02-18 CN CN 03215088 patent/CN2614931Y/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 |