CN103317907B - A kind of magnetic compasses - Google Patents
A kind of magnetic compasses Download PDFInfo
- Publication number
- CN103317907B CN103317907B CN201310235131.3A CN201310235131A CN103317907B CN 103317907 B CN103317907 B CN 103317907B CN 201310235131 A CN201310235131 A CN 201310235131A CN 103317907 B CN103317907 B CN 103317907B
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- CN
- China
- Prior art keywords
- rule
- shifter
- compasses
- peep hole
- magnet
- 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 invention belongs to teaching aid technical field, particularly relate to a kind of magnetic compasses.The invention discloses a kind of magnetic compasses, magnetic compasses comprise rule, rule is provided with graduation mark, initial point is carved with in one end of rule, one end rule being positioned at initial point is connected with location-plate, the back of location-plate is provided with magnet, on rule, movable sleeve is connected to shifter, shifter offers the peep hole of observable graduation mark, peep hole be centrally located on graduation mark, shifter offers the fixing hole corresponding with peep hole, the center of peep hole is equal with the spacing of magnetic blow out centre with initial point with the spacing at the center of fixing hole, the both sides of shifter are provided with rotary fixing screw mother.Compasses of the present invention can be inhaled on magnet board firmly, are not easy landing from blackboard, and magnetic compasses are much smaller, lightly, easy to use.
Description
Technical field
The invention belongs to teaching aid technical field, particularly relate to a kind of magnetic compasses.
Background technology
Teacher, when blackboard upper drawing circle, adopts three kinds of compasses at present: a supporting leg of the first compasses is equipped with iron nail and is fixed on blackboard; A supporting leg of the second compasses is equipped with rubber to be fixed on blackboard; A supporting leg of the third compasses is equipped with sucker be fixed on blackboard.Present blackboard is all magnet board, and its feature iron sheet material does, surperficial smoother, and very hard again, and magnetic is more weak.Teacher when blackboard upper drawing circle, has many weak points: the first compasses with above-mentioned compasses, draws bowlder iron nail and is not easy on blackboard fixing, be easy to landing from blackboard, and nail is easy to cause damage to blackboard.It is unstable too that bowlder made by the second compasses, easy landing.The third compasses sucker is difficult to hold blackboard sometimes, and easily from blackboard landing, and sucker is softer, and in the process of drawing, radius of circle has some change, drawn circle not too standard.Therefore, I devises a kind of magnetic compasses, avoids above-mentioned weak point.
Summary of the invention
The object of the invention is to solve above-described technical problem, provide a kind of magnetic compasses, its technical scheme is as follows:
A kind of magnetic compasses, described magnetic compasses comprise rule, described rule is provided with graduation mark, initial point is carved with in one end of described rule, the one end described rule being positioned at initial point is connected with location-plate, the back of described location-plate is provided with magnet, on described rule, movable sleeve is connected to shifter, described shifter offers the peep hole of observable graduation mark, described peep hole be centrally located on graduation mark, described shifter offers the fixing hole corresponding with peep hole, the center of described peep hole is equal with the spacing of magnetic blow out centre with initial point with the spacing at the center of fixing hole, the both sides of described shifter are provided with rotary fixing screw mother.
Preferred embodiment is, described magnet is annular strong magnet, and the center of described annular strong magnet is provided with the screw flushed with annular strong magnet.
Preferred embodiment is, the other end of described rule is provided with baffle plate.
Magnetic compasses provided by the invention, when in use:
1. first the one end with magnet is placed on blackboard, by magnet, whole compasses is adsorbed on blackboard, and the center of magnet is exactly the center of circle of drawn circle.
2. insert piece of chalk in the fixing hole then on shifter, then by the fixing chalk of rotary fixing screw mother.
3. slip shifter, determines the size (radius of circle can observe display on the peep hole of shifter) of circle, by peep hole, shifter is slided on required radius of a circle value graduation mark, to be then tightened shifter by rotary fixing screw mother.
4. arrest chalk, can directly justify on blackboard.
Magnet of the present invention is annular strong magnet, and the center of described annular strong magnet is provided with the screw flushed with annular strong magnet.By the screw of centre coats chalk dust with chalk, can leave the vestige of chalk dust when magnetic compasses are inhaled on magnet board, this vestige is exactly the center of circle of circle.The center of circle can be made so more obvious, contribute to teaching.
Initial point on rule of the present invention is all generally the starting point of scale value, can determine drawn radius of a circle size by shifter, and fixing hole is used to fixing chalk use.The object of peep hole is convenient to observe scale value, makes radius of a circle size more accurate.And the center of described peep hole is equal with the spacing of magnetic blow out centre with initial point with the spacing at the center of fixing hole, can ensure that the size of drawn radius of a circle is exactly the value shown by scale value.
The other end of rule of the present invention is provided with baffle plate.The shifter be positioned on rule can be made can not to fall down from rule by baffle plate.
The present invention can draw the circle varied in size of radius 4 to 30 centimetres on magnet board when general actual use.
Compasses of the present invention can be inhaled on magnet board firmly, are not easy landing from blackboard, as long as draw bowlder just can draw a standard of comparison easily circle with a hand, magnetic compasses are more much smaller, lightly, easy to use than above-mentioned three kinds of compasses.
Accompanying drawing explanation
Fig. 1 schematic diagram of the present invention.
Detailed description of the invention
Embodiment is illustrated below in conjunction with Fig. 1:
A kind of magnetic compasses, described magnetic compasses comprise rule 1, described rule 1 is provided with graduation mark 2, initial point 3 is carved with in one end of described rule 1, the one end described rule 1 being positioned at initial point 3 is connected with location-plate 4, the back of described location-plate 4 is provided with magnet 5, on described rule 1, movable sleeve is connected to shifter 6, described shifter 6 offers the peep hole 7 of observable graduation mark 2, described peep hole 7 be centrally located on graduation mark 2, described shifter 6 offers the fixing hole 8 corresponding with peep hole 7, the center of described peep hole 7 is equal with the spacing at magnet 5 center with initial point 3 with the spacing at the center of fixing hole 8, the both sides of described shifter 6 are provided with rotary fixing screw mother 9.
Preferred embodiment is, described magnet is annular strong magnet, and the center of described annular strong magnet is provided with the screw 10 flushed with annular strong magnet.
Magnetic compasses provided by the invention, when in use:
1. first the one end with magnet is placed on blackboard, by magnet, whole compasses is adsorbed on blackboard, and the center of magnet is exactly the center of circle of drawn circle.
2. insert piece of chalk in the fixing hole then on shifter, then by the fixing chalk of rotary fixing screw mother.
3. slip shifter, determines the size (radius of circle can observe display on the peep hole of shifter) of circle, by peep hole, shifter is slided on required radius of a circle value graduation mark, to be then tightened shifter by rotary fixing screw mother.
4. arrest chalk, can directly justify on blackboard.
Claims (2)
1. magnetic compasses, it is characterized in that, described magnetic compasses comprise rule, described rule is provided with graduation mark, initial point is carved with in one end of described rule, the one end described rule being positioned at initial point is connected with location-plate, the back of described location-plate is provided with magnet, on described rule, movable sleeve is connected to shifter, described shifter offers the peep hole of observable graduation mark, described peep hole be centrally located on graduation mark, described shifter offers the fixing hole corresponding with peep hole, the center of described peep hole is equal with the spacing of magnetic blow out centre with initial point with the spacing at the center of fixing hole, the both sides of described shifter are provided with rotary fixing screw mother, described magnet is annular strong magnet, the center of described annular strong magnet is provided with the screw flushed with annular strong magnet.
2. magnetic compasses as claimed in claim 1, it is characterized in that, the other end of described rule is provided with baffle plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310235131.3A CN103317907B (en) | 2013-06-14 | 2013-06-14 | A kind of magnetic compasses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310235131.3A CN103317907B (en) | 2013-06-14 | 2013-06-14 | A kind of magnetic compasses |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103317907A CN103317907A (en) | 2013-09-25 |
| CN103317907B true CN103317907B (en) | 2015-12-02 |
Family
ID=49187083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310235131.3A Expired - Fee Related CN103317907B (en) | 2013-06-14 | 2013-06-14 | A kind of magnetic compasses |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103317907B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105599502A (en) * | 2016-03-03 | 2016-05-25 | 游婧 | Chalkboard-friendly teaching aid compasses |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2197226Y (en) * | 1994-06-27 | 1995-05-17 | 常青民 | Multifunctional magnet compass |
| CN2818171Y (en) * | 2005-07-14 | 2006-09-20 | 张淑贤 | Multifunctional magnetic ruling compass |
| DE202007004937U1 (en) * | 2007-04-02 | 2007-07-19 | Knopf, Jürgen | Compass for use at large-area blackboard, has three-armed base supporting magnets, which hold base at blackboard with magnetic force, where one of magnets on surface supports thin layer made of flexible elastic material |
| CN201329740Y (en) * | 2008-12-29 | 2009-10-21 | 吴丽华 | Ruler capable of drawing circle |
| CN201329742Y (en) * | 2008-12-29 | 2009-10-21 | 郑嘉雯 | Suction-type compasses |
| KR101103946B1 (en) * | 2009-09-24 | 2012-01-12 | 한전케이피에스 주식회사 | Compasses for a Gas Cutter |
| CN201712353U (en) * | 2010-07-13 | 2011-01-19 | 邱俊崚 | Teaching compasses |
| CN102407717A (en) * | 2011-12-05 | 2012-04-11 | 陈道伟 | Compasses with magnetic legs |
-
2013
- 2013-06-14 CN CN201310235131.3A patent/CN103317907B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN103317907A (en) | 2013-09-25 |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151202 Termination date: 20160614 |
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| CF01 | Termination of patent right due to non-payment of annual fee |