CN201777043U - Combined type compasses used for mathematical teaching - Google Patents
Combined type compasses used for mathematical teaching Download PDFInfo
- Publication number
- CN201777043U CN201777043U CN2010202745001U CN201020274500U CN201777043U CN 201777043 U CN201777043 U CN 201777043U CN 2010202745001 U CN2010202745001 U CN 2010202745001U CN 201020274500 U CN201020274500 U CN 201020274500U CN 201777043 U CN201777043 U CN 201777043U
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- Prior art keywords
- pole
- combined type
- chalk sleeve
- housing
- angle
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Abstract
The utility model discloses a pair of combined type compasses used for mathematical teaching, which comprises a fixing strut (1), a rotating strut (2), a chalk sleeve (3) and a positioning leg (4). The upper ends of the fixing strut (1) and the rotating strut (2) are fixed together through a pin shaft. The utility model is characterized in that the positioning leg (4) and the chalk sleeve (3) are pivoted and fixed at the lower ends of the fixing strut (1) and the rotating strut (2) respectively, the positioning leg (4) and the chalk sleeve (3) are sleeved on a ruler (7) respectively through slide sleeves (5 and 6) on respective rear side walls, and positioning bolts (8) are respectively arranged at the middle parts of the rear side walls of the slide sleeves (5 and 6). Compared with the compasses used in the prior art, the pair of combined type compasses used for mathematical teaching can help to draw a circle having a designated radius accurately and rapidly, is convenient to carry and safe and convenient to use, and can be widely used for mathematical teaching.
Description
Technical field
The utility model relates to a kind of improvement of compasses for teaching, specifically a kind of mathematical education combined type compasses.
Background technology
At present, the compasses that use in mathematical education are made of fixing pole, rotation pole and chalk sleeve, and fixedly the upper end of pole and rotation pole is fixed together by bearing pin, are provided with pin in the fixing lower end of pole and follow closely, and are provided with chalk sleeve in the lower end that rotates pole.When need on blackboard, drawing the certain bowlder of radius, need determine the open width of compasses with rule earlier, complex operation uses inconveniently, and the pin nail stabs the people easily, is not easy to carry.Someone has proposed a kind of middle part compasses pole and has fixed the arc scale, select radius by the scale on the arc scale, but still there is deficiency in this compasses, its weak point is: the scale on its arc scale is by coming out of converting, inconsistent with the scale on the normal ruler, draw bowlder and be easy to occur error, influence drawing effect.
Summary of the invention
The purpose of this utility model be to provide a kind of can draw out the circle of specifying radius accurately and quickly and be easy to carry, safe in utilization, mathematical education combined type compasses easily.
For reaching above purpose, the technical scheme that the utility model adopted is: this mathematical education combined type compasses, by fixedly pole, rotation pole, chalk sleeve and angle constitute, fixedly the upper end of pole and rotation pole is fixed together by bearing pin, it is characterized in that angle and chalk sleeve respectively riveted and fixed fixing pole with rotate the lower end of pole, angle and chalk sleeve are set on the scale by the sliding sleeve on himself rear wall respectively, are equipped with bolt at the rear wall middle part of sliding sleeve.
The utility model is also implemented by following measure: described angle, be made of housing, spring and pin nail, the sidewall of housing is provided with chute, and housing is set in the outside of pin nail, pilot pin passes the upper end that chute is vertically fixed on the pin nail, is provided with spring between the downside wall of pin nail and housing.
The beneficial effects of the utility model are: compare with the compasses of present use, can draw out the circle of specifying radius accurately and quickly, and be easy to carry, and safe in utilization, convenient.Can be widely used in mathematical education.
Description of drawings
Fig. 1, be structure front-view schematic diagram of the present utility model.
Fig. 2, be structure schematic rear view of the present utility model.
Fig. 3, analyse and observe enlarged diagram for the office of the utility model angle.
The specific embodiment
Make the utility model with reference to accompanying drawing 1,2,3.This mathematical education combined type compasses, by fixedly pole 1, rotation pole 2, chalk sleeve 3 and angle 4 constitute, fixedly the upper end of pole 1 and rotation pole 2 is fixed together by bearing pin, it is characterized in that angle 4 and chalk sleeve 3 respectively riveted and fixed fixing pole 1 with rotate the lower end of pole 2, angle 4 and chalk sleeve 3 are set on the scale 7 by the sliding sleeve 5,6 on himself rear wall respectively, angle 4 and chalk sleeve 3 can slide on scale 7, scale 7 is provided with scale, is equipped with bolt 8 at the rear wall middle part of sliding sleeve 5,6.
Described angle 4, constitute by housing 4a, spring 4b and pin nail 4c, the sidewall of housing 4a is provided with chute 4d, housing 4a is set in the outside of pin nail 4c, and pin nail 4c can slide in housing 4a, and pilot pin 4e passes the upper end that chute 4d is vertically fixed on pin nail 4c, between the downside wall of pin nail 4c and housing 4a, be provided with spring 4b, after drawing finishes, pin can be followed closely 4c and be withdrawn in the housing 4a, safe in utilization, convenient.
Claims (2)
1. mathematical education combined type compasses, by fixedly pole (1), rotation pole (2), chalk sleeve (3) and angle (4) constitute, fixedly the upper end of pole (1) and rotation pole (2) is fixed together by bearing pin, it is characterized in that angle (4) and chalk sleeve (3) respectively riveted and fixed fixing pole (1) with rotate the lower end of pole (2), angle (4) and chalk sleeve (3) are set on the scale (7) by the sliding sleeve (5,6) on himself rear wall respectively, are equipped with bolt (8) at the rear wall middle part of sliding sleeve (5,6).
2. mathematical education combined type compasses according to claim 1, it is characterized in that described angle (4), constitute by housing (4a), spring (4b) and pin nail (4c), the sidewall of housing (4a) is provided with chute (4d), housing (4a) is set in the outside of pin nail (4c), pilot pin (4e) passes the upper end that chute (4d) is vertically fixed on pin nail (4c), is provided with spring (4b) between the downside wall of pin nail (4c) and housing (4a).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202745001U CN201777043U (en) | 2010-07-29 | 2010-07-29 | Combined type compasses used for mathematical teaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202745001U CN201777043U (en) | 2010-07-29 | 2010-07-29 | Combined type compasses used for mathematical teaching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201777043U true CN201777043U (en) | 2011-03-30 |
Family
ID=43790272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202745001U Expired - Fee Related CN201777043U (en) | 2010-07-29 | 2010-07-29 | Combined type compasses used for mathematical teaching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201777043U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106114013A (en) * | 2016-08-31 | 2016-11-16 | 甄泓忠 | The Geometric figure drawing compasses that a kind of students in mathematics teaching is special |
| CN106739682A (en) * | 2015-11-25 | 2017-05-31 | 上海市格致中学 | A kind of compasses being convenient for measuring |
| KR20180001488U (en) * | 2016-11-10 | 2018-05-18 | 김영진 | Compass |
| WO2019210438A1 (en) * | 2018-05-01 | 2019-11-07 | Yao Juan | Labor-saving multifunctional compass |
-
2010
- 2010-07-29 CN CN2010202745001U patent/CN201777043U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106739682A (en) * | 2015-11-25 | 2017-05-31 | 上海市格致中学 | A kind of compasses being convenient for measuring |
| CN106114013A (en) * | 2016-08-31 | 2016-11-16 | 甄泓忠 | The Geometric figure drawing compasses that a kind of students in mathematics teaching is special |
| KR20180001488U (en) * | 2016-11-10 | 2018-05-18 | 김영진 | Compass |
| KR200487383Y1 (en) * | 2016-11-10 | 2018-10-22 | 김영진 | Compass |
| WO2019210438A1 (en) * | 2018-05-01 | 2019-11-07 | Yao Juan | Labor-saving multifunctional compass |
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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: 20110330 Termination date: 20110729 |