CN203032207U - Teaching compasses - Google Patents
Teaching compasses Download PDFInfo
- Publication number
- CN203032207U CN203032207U CN2012207430191U CN201220743019U CN203032207U CN 203032207 U CN203032207 U CN 203032207U CN 2012207430191 U CN2012207430191 U CN 2012207430191U CN 201220743019 U CN201220743019 U CN 201220743019U CN 203032207 U CN203032207 U CN 203032207U
- Authority
- CN
- China
- Prior art keywords
- guide rail
- compasses
- slide block
- circle
- orientation seat
- 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
The utility model discloses teaching compasses which comprise a circular positioning seat and a fastening device. A rotating ring capable of rotating around a center line of the circular positioning seat is disposed on the outer wall of the circular positioning seat. The outer wall of the rotating ring is provided with a guide extending out. A slider capable of sliding on the guide is disposed on the guide. A chalk holder for mounting a chalk is disposed on the slider. The slider is fastened and positioned at any position on the guide through the fastening device. Before a circle or an arc is drawn, the slider is allowed to drive the chalk holder to move, in relation to the guide, to a certain position and is fixed on the guide through the fastening device so that radius of the circle or arc to be drawn is determined; then, the compasses are moved to the circular bottom of the circular positioning seat to be abutted to a blackboard; finally, the circle or arc is conveniently drawn on the blackboard by pushing the slider to drive the rotating ring to rotate around the center line of the circular positioning seat.
Description
Technical field
The utility model relates to a kind of for the compasses of drawing at blackboard to impart knowledge to students.
Background technology
At present, be used for generally comprising by hinge hinged picture arm and centering pole at the compasses of blackboard upper drawing circle or circular arc, wherein, the front end of centering pole is provided with pilot pin, the front end of drawing arm then is provided with for the chalk anchor clamps that chalk is installed, draw in the process of circle or circular arc, earlier control the circle that to draw or the radius of circular arc by adjusting angle between picture arm and the centering pole, then compasses are moved to its pilot pin and blackboard offsets, the picture arm is rotated around pilot pin, can draw circle or circular arc, but this compasses are deposited and are still had some deficits, as: because blackboard is by metal material, glass or cement are made, and its surface that is used for writing on the blackboard is very hard, and the contact-making surface of pilot pin and blackboard is very little, basically belong to a contact, corresponding frictional force is also just very little naturally, so, when drawing circle or circular arc, decide pin blackboard appearance slip relatively easily, cause drawn circle or circular arc undesirable; In addition, self does not have scale existing compasses, so need draw when the circle of concrete radius value or circular arc, need to measure the pilot pin of compasses and the spacing between the chalk by extra rule on one side, adjust both spacings on one side, spacing size until both meets the requirements, and obviously, operation is trouble quite.
Summary of the invention
The purpose of this utility model be to provide a kind of can be accurately and easily at the draw compasses of teaching usefulness of required circle or circular arc of blackboard.
The compasses of teaching usefulness described in the utility model, comprise circular orientation seat and device for fastening, the outer wall of circular orientation seat is equipped with the change that can rotate around the center line of circular orientation seat, the outer wall of change is outward extended with guide rail, guide rail is equipped with the slide block that can slide at guide rail, slide block is provided with for the chalk anchor clamps that chalk is installed, and slide block tightens up the optional position that is positioned on the guide rail by device for fastening.
The utility model adopts the circular orientation seat to position, draw in the process of circle or circular arc, order about the relative guide rail of slide block drive chalk anchor clamps earlier and move to certain position, and by device for fastening slide block is fixed tightly on the guide rail, with the definite circle that will draw or the radius of circular arc; Then, annular bottom surface and the blackboard that compasses is moved to its circular orientation seat offsets; Then, promote slide block, making it drive change rotates around the center line of circular orientation seat, can be easily at blackboard draw circle or circular arc accurately, and in the process of drawing circle or circular arc, the circular orientation seat offsets by annular bottom surface and the blackboard of its bottom, contact-making surface between the two is bigger, the corresponding frictional force that produces is also bigger, can prevent when drawing circle or circular arc, thereby the situation that the relative blackboard slip of circular orientation seat influences the picture effect takes place.
Description of drawings
Fig. 1 is the utility model front view.
Fig. 2 is the enlarged detail of the A part of Fig. 1.
Fig. 3 is vertical view of the present utility model.
The specific embodiment
As shown in Figures 1 to 3, the compasses of described a kind of usefulness of imparting knowledge to students, comprise circular orientation seat 1 and device for fastening 20, the outer wall of circular orientation seat 1 is equipped with the change 2 that can rotate around the center line of circular orientation seat 1, the outer wall of change 2 is outward extended with guide rail 3, guide rail 3 is equipped with can be at the slide block 4 of guide rail 3 slips, and slide block 4 is provided with for the chalk anchor clamps 5 that chalk 10 is installed, and slide block 4 tightens up the optional position that is positioned on the guide rail 3 by device for fastening 20.The described mode that change is installed in rotation on the circular orientation seat is prior art, as adopt outer shroud with bearing be installed in mode on the ring.In the process of drawing circle or circular arc, order about slide block 4 drive chalk anchor clamps 5 relative guide rails 3 earlier and move to certain position, and by device for fastening 20 slide block 4 is fixed tightly on the guide rail 3, with the definite circle that will draw or the radius of circular arc; Then, annular bottom surface and the blackboard that compasses is moved to its circular orientation seat 1 offsets; Then, promote slide block 4, make it drive change 2 and rotate around the center line of circular orientation seat 1, can draw at blackboard easily and justify accurately or circular arc.
As shown in Figure 1 and Figure 2, described device for fastening 20 can be bolt, has screw on the described slide block 4, and bolt is installed in the screw, and bolt is twisted when offseting to its rod end and guide rail 3, slide block 4 can be fixed tightly on the guide rail 3.Certainly, also can adopt existing other device for fastening 20 that slide block 4 is fixed tightly on the guide rail 3, and because by device for fastening 20 slide block 4 to be fixed tightly on the guide rail 3 be the technological means that those skilled in the art uses always, no longer existing other device for fastening are given unnecessary details here.
As Fig. 1, shown in Figure 3, for circle or the circular arc that can draw more easily and have concrete radius value, can scale 31 be set at described guide rail 3.
As shown in Figure 3, the inwall of described circular orientation seat 1 extends at least two thin bars 6 that are intersected in the center line of circular orientation seat 1, the circle that can will draw in the blackboard location by the joint in the centerline of circular orientation seat 1 of described thin bar 6 or the center of circle of circular arc.
As Fig. 1, shown in Figure 3, the not end of described guide rail 3 is provided with the flange 7 that anti-limited slip block 4 is deviate from guide rail 3.
Claims (5)
1. the compasses of the usefulness of imparting knowledge to students, it is characterized in that: comprise circular orientation seat (1) and device for fastening (20), the outer wall of circular orientation seat (1) is equipped with the change (2) that can rotate around the center line of circular orientation seat (1), the outer wall of change (2) is outward extended with guide rail (3), guide rail (3) is equipped with can be at the slide block (4) of guide rail (3) slip, slide block (4) is provided with for the chalk anchor clamps (5) that chalk (10) is installed, and slide block (4) tightens up the optional position that is positioned on the guide rail (3) by device for fastening (20).
2. the compasses of teaching usefulness according to claim 1, it is characterized in that: described device for fastening (20) is bolt, has screw on the slide block (4), and bolt is installed in the screw, bolt is twisted to its rod end and guide rail (3) when offseting, slide block (4) can be fixed tightly on the guide rail (3).
3. the compasses of teaching usefulness according to claim 1 is characterized in that: scale (31) is set on the described guide rail (3).
4. the compasses of teaching usefulness according to claim 1, it is characterized in that: the inwall of described circular orientation seat (1) extends at least two thin bars (6) that are intersected in the center line of circular orientation seat (1).
5. the compasses of teaching usefulness according to claim 1, it is characterized in that: the not end of described guide rail (3) is provided with the flange (7) that anti-limited slip block (4) is deviate from guide rail (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207430191U CN203032207U (en) | 2012-12-31 | 2012-12-31 | Teaching compasses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207430191U CN203032207U (en) | 2012-12-31 | 2012-12-31 | Teaching compasses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203032207U true CN203032207U (en) | 2013-07-03 |
Family
ID=48684348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012207430191U Expired - Fee Related CN203032207U (en) | 2012-12-31 | 2012-12-31 | Teaching compasses |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203032207U (en) |
-
2012
- 2012-12-31 CN CN2012207430191U patent/CN203032207U/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 | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20131231 |