CN201353957Y - Analytic geometry surveying instrument - Google Patents
Analytic geometry surveying instrument Download PDFInfo
- Publication number
- CN201353957Y CN201353957Y CNU2008201340481U CN200820134048U CN201353957Y CN 201353957 Y CN201353957 Y CN 201353957Y CN U2008201340481 U CNU2008201340481 U CN U2008201340481U CN 200820134048 U CN200820134048 U CN 200820134048U CN 201353957 Y CN201353957 Y CN 201353957Y
- Authority
- CN
- China
- Prior art keywords
- pin
- centering
- surveying instrument
- analytic geometry
- ruler
- 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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Abstract
The utility model provides an analytic geometry surveying instrument, which is characterized by comprising four rulers, a pin, a centering rod, a centering pin and a wire, wherein three of the rulers are connected with each other to form a right-angled triangle through the pin, and the other ruler is used as a directrix, and a fine wire is fastened on the right end on the bottom edge of the triangle, and the other end of the wire is fixed on the centering pin which is used as a focus, and the centering pin is fixed on one end of the centering rod. The analytic geometry surveying instrument can draw different parabola graphs with different sizes, and the streak of the drawn graphs is smooth and beautiful. The analytic geometry surveying instrument has simple structure, low price and convenient application.
Description
Technical field
The utility model relates to a kind of teaching topographic equipment, particularly relates to the analytic geometry surveying instrument.
Background technology
The teacher in the process of professor's analytic geometry, the parabolical figure that usually need on blackboard, draw, at present, the method of drawing the parabola figure mainly is that this method workload is big, time-consuming with tabulation, described point, graphing method, and, be difficult for the smooth parabola that draws, brought inconvenience to teaching.
Summary of the invention
The purpose of this utility model provides a kind of analytic geometry surveying instrument, and it can accurately make various parabolas and hyperbola figure, and the pattern line of making is smooth, and it is simple in structure, easy accessibility.
In order to achieve the above object, analytic geometry surveying instrument of the present utility model is characterized in that: comprise four rulers, pin, centering bar, centering pin and line;
With pin three rulers are connected into a right angled triangle, another ruler is made directrix, and at right-hand member bolt one fine rule of triangle crossfoot, and the other end of line is fixed on to be done on the centering pin that focus uses, centering pin is fixed on centering bar one end, and the length of side of the perpendicular chi of triangle will grow the base of crossfoot.
Aforesaid analytic geometry surveying instrument is characterized in that: 4 is ruler the unit scale with the millimeter, and with the identical hole of identical length drill diameter.
Aforesaid analytic geometry surveying instrument is characterized in that: centering pin is vertical with the symmetrical centre of centering bar.
Pin all the other four fingers of centering bar by deciding ruler with the left hand thumb, the right hand is tightened the line that is connected right angled triangle straight horizontal arm of angle right-hand member and centering pin top with pen, and pen slides with the straight horizontal arm of angle of right angled triangle all the time, and nib is with regard to the parabola that draws in the plane like this.
Analytic geometry surveying instrument of the present utility model can accurately be made various different big or small parabola figures, the pattern line smooth and beautiful appearance of making, and simple in structure, price is low, and is easy to use.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment.
The specific embodiment
Fig. 1 description of symbols: ruler 1, pin 2, line 3, pen 4, centering pin 5, centering bar 6.
Referring to Fig. 1, analytic geometry surveying instrument of the present utility model comprises four rulers 1, pin 2, centering bar 6, centering pin 5 and line 3.
Be through by pin 2 in the hole of ruler 1, three fixedly connected in twos ruler 1, three form right angled triangle to ruler 1, make a little higher than paper plane of square lower plane, are as the criterion to put into centering pin.Centering pin 5 is vertical with the symmetrical centre of centering bar 6, and an end of line 3 is fixed on the base right-hand member of right angled triangle, and the other end is fixed on the centering pin 5.
Described ruler 1 is the unit scale with the millimeter,, and with the identical hole of identical length drill diameter.
When making parabola with the analytic geometry surveying instrument, pin with the left hand thumb bar 6 of will feeling relieved, all the other of left hand four refer to by deciding ruler, the right angled triangle straight vertical arm of angle of three ruler 1 compositions is near the ruler 1 of doing directrix, the right hand is tightened the line 3 that is connected right angled triangle straight horizontal arm of angle right-hand member and centering pin 5 tops with pen 4, and pen 4 slides with the straight horizontal arm of angle of right angled triangle all the time, and nib is with regard to the parabola that draws in the plane like this.
Analytic geometry surveying instrument of the present utility model can accurately be made various different big or small parabola and hyperbola figures, the pattern line smooth and beautiful appearance of making, and simple in structure, price is low, and is easy to use, is fit to middle and primary schools' teaching and uses.
Claims (3)
1, analytic geometry surveying instrument is characterized in that: comprise four rulers, pin, centering bar, centering pin and line;
With pin three rulers are connected into a right angled triangle, another ruler is made directrix, and at right-hand member bolt one fine rule of triangle crossfoot, and the other end of line is fixed on to be done on the centering pin that focus uses, centering pin is fixed on centering bar one end, and the length of side of the perpendicular chi of triangle will grow the base of crossfoot.
2, analytic geometry surveying instrument as claimed in claim 1 is characterized in that: 4 is ruler the unit scale with the millimeter, and with the identical hole of identical length drill diameter.
3, analytic geometry surveying instrument as claimed in claim 1 or 2 is characterized in that: centering pin is vertical with the symmetrical centre of centering bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201340481U CN201353957Y (en) | 2008-09-09 | 2008-09-09 | Analytic geometry surveying instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201340481U CN201353957Y (en) | 2008-09-09 | 2008-09-09 | Analytic geometry surveying instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201353957Y true CN201353957Y (en) | 2009-12-02 |
Family
ID=41410298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201340481U Expired - Fee Related CN201353957Y (en) | 2008-09-09 | 2008-09-09 | Analytic geometry surveying instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201353957Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106976340A (en) * | 2017-05-10 | 2017-07-25 | 李若彤 | A kind of para-curve gauge and student's Multi-purpose gauge and its application method |
-
2008
- 2008-09-09 CN CNU2008201340481U patent/CN201353957Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106976340A (en) * | 2017-05-10 | 2017-07-25 | 李若彤 | A kind of para-curve gauge and student's Multi-purpose gauge and its application method |
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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: 20091202 Termination date: 20120909 |