CN201731842U - Common tangent length measurer - Google Patents
Common tangent length measurer Download PDFInfo
- Publication number
- CN201731842U CN201731842U CN2010202043367U CN201020204336U CN201731842U CN 201731842 U CN201731842 U CN 201731842U CN 2010202043367 U CN2010202043367 U CN 2010202043367U CN 201020204336 U CN201020204336 U CN 201020204336U CN 201731842 U CN201731842 U CN 201731842U
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- CN
- China
- Prior art keywords
- ruler
- slide block
- right scale
- scaleplate
- scale
- 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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- Length-Measuring Instruments Using Mechanical Means (AREA)
- Drawing Aids And Blackboards (AREA)
Abstract
The utility model discloses a common tangent length measurer which is characterized by consisting of a ruler (1), a slide block (2) and a left scaleplate (3) and a right scaleplate (4), wherein the left scaleplate (3) and the right scaleplate (4) vertical to the ruler are fixed at the left end and the right end of the ruler (1) respectively through the slide block (2); the middles of the bottom surfaces of the ruler (1), the slide block (2) and the left scaleplate (3) and the right scaleplate (4) are provided with marks; and the middle of the bottom walls of the left scaleplate (3) and the right scaleplate (4) are fixed with upper stitches (5). The common tangent length measurer is simple in structure and convenient in use, and can directly measure the common tangent length of the two circles known, save time and effort, and improve the learning efficiency of students.
Description
Technical field
The utility model relates to a kind of survey instrument, especially a kind of length of base tangent measuring appliance.
Background technology
In same plane, that the position relation of circle and circle is divided into is crossing, from tangent, outside being divided into again from include the tangent inscribe and circumscribed that is divided into.Two circles are when the same side of common tangent, and such common tangent is called outside common tangent; Two circles are when the both sides of common tangent, and such common tangent is called internal common tangent; The distance at two point of contacts is called the length of common tangent on the common tangent.Intersect, from or two mutually circumscribed existing outside common tangents of circle, internal common tangent is arranged again; Two circles of phase inscribe have only outside common tangent; Two circles that include had not mutually both had outside common tangent, did not have internal common tangent again.In mathematical education,, can only the length computation of two common tangents of justifying could be come out at present by calculating owing to there is not special survey instrument, time-consuming, effort, also easy sometimes miscount has reduced student's learning efficiency.
Summary of the invention
It is a kind of simple in structure, easy to use that the purpose of this utility model is to provide, and can directly measure the long length of base tangent measuring appliance of common tangent of known two circles.
For reaching above purpose, the technical scheme that the utility model adopted is: this length of base tangent measuring appliance, it is characterized in that it is made of ruler, slide block and left and right scale, ruler, slide block and left and right scale are made by transparent material, fix respectively and the orthogonal left and right scale of ruler at the left and right two ends of ruler by slide block, slide block all can endwisely slipping along ruler and left and right scale, bottom side middle part at ruler, slide block and left and right scale is equipped with scale, all fixes stitch at the downside wall middle part of left and right scale.
The utility model is also implemented by following measure: described slide block upper and lower is provided with orthogonal dovetail groove, and ruler and left and right scale embed respectively in the dovetail groove corresponding on the slide block; The upper side wall middle part of described ruler and left and right scale is equipped with the indication groove; Described stitch all is fixed on the zero graduation line of left and right scale.
The beneficial effects of the utility model are: simple in structure, easy to use, can directly measure the length of base tangents of known two circles, and save time, laborsaving, can improve student's learning efficiency.
Description of drawings
Fig. 1, be structure schematic top plan view of the present utility model.
Fig. 2, be structure front-view schematic diagram of the present utility model.
Fig. 3, be that the utility model is along Figure 1A-A cross-sectional schematic.
Embodiment
Make the utility model with reference to accompanying drawing 1,2,3.This length of base tangent measuring appliance, it is characterized in that it is made of ruler 1, slide block 2 and left and right scale 3,4, ruler 1, slide block 2 and left and right scale 3,4 are made by transparent material, fix respectively and the orthogonal left and right scale 3,4 of ruler at the left and right two ends of ruler 1 by slide block 2, slide block 2 all can endwisely slipping along ruler 1 and left and right scale 3,4, bottom side middle part at ruler 1, slide block 2 and left and right scale 3,4 is equipped with scale, all fixes stitch 5 at the downside wall middle part of left and right scale 3,4.
Described slide block 2 upper and lower is provided with orthogonal dovetail groove 6, and ruler 1 and left and right scale 3,4 embed respectively in the dovetail groove 6 corresponding on the slide block 2; The upper side wall middle part of described ruler 1 and left and right scale 3,4 is equipped with indication groove 7; Described stitch 5 all is fixed on the zero graduation line of left and right scale 3,4.
When using the utility model, adjust the position of left and right scale, make stitch and the distance between the indication groove on the ruler on the left and right scale consistent with known two radius of a circles respectively, the stitch of left scale is placed on the center of circle of a circle, with this center of circle is that left scale is rotated in the axle center, and along the slide block of the fixing right scale of endwisely slipping of ruler, when the stitch on the right scale overlapped with center of circle of another circle, the distance between left and right two slide blocks was exactly two length of justifying common tangents.
Claims (2)
1. length of base tangent measuring appliance, it is characterized in that it is made of ruler (1), slide block (2) and left and right scale (3,4), fix respectively upward and the orthogonal left and right scale of ruler (3,4) at the left and right two ends of ruler (1) by slide block (2), bottom side middle part at ruler (1), slide block (2) and left and right scale (3,4) is equipped with scale, all fixing stitch (5) of going up at the downside wall middle part of left and right scale (3,4).
2. length of base tangent measuring appliance according to claim 1, the upper and lower orthogonal dovetail groove (6) that is provided with that it is characterized in that described slide block (2), ruler (1) and left and right scale (3,4) embed slide block (2) respectively and go up in the corresponding dovetail groove (6); The upper side wall middle part of described ruler (1) and left and right scale (3,4) is equipped with indication groove (7); Described stitch (5) all is fixed on the zero graduation line of left and right scale (3,4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202043367U CN201731842U (en) | 2010-05-27 | 2010-05-27 | Common tangent length measurer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202043367U CN201731842U (en) | 2010-05-27 | 2010-05-27 | Common tangent length measurer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201731842U true CN201731842U (en) | 2011-02-02 |
Family
ID=43523000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202043367U Expired - Fee Related CN201731842U (en) | 2010-05-27 | 2010-05-27 | Common tangent length measurer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201731842U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110455168A (en) * | 2019-09-02 | 2019-11-15 | 蚌埠中光电科技有限公司 | A kind of advanced lines TFT glass A type frame detection device |
-
2010
- 2010-05-27 CN CN2010202043367U patent/CN201731842U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110455168A (en) * | 2019-09-02 | 2019-11-15 | 蚌埠中光电科技有限公司 | A kind of advanced lines TFT glass A type frame detection device |
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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: 20110202 Termination date: 20110527 |