CN201803672U - Circular arc radius measuring instrument - Google Patents
Circular arc radius measuring instrument Download PDFInfo
- Publication number
- CN201803672U CN201803672U CN2010202552992U CN201020255299U CN201803672U CN 201803672 U CN201803672 U CN 201803672U CN 2010202552992 U CN2010202552992 U CN 2010202552992U CN 201020255299 U CN201020255299 U CN 201020255299U CN 201803672 U CN201803672 U CN 201803672U
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- CN
- China
- Prior art keywords
- ruler
- protractor
- circular arc
- arc radius
- measuring instrument
- 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)
Abstract
The utility model provides a circular arc radius measuring instrument which comprises a protractor and a ruler, wherein, the protractor is provided with a circular structure; graduation lines from 0 DEG to 360 DEG are evenly marked around the circumference in sequence; a shaft lever is mounted at the circle center of the protractor; one end of the shaft lever is rotationally connected with a zero graduation of the ruler, and the other end of the shaft lever is rotationally connected with the middle section of a rotating rod; and a strip-shaped opening is formed on the surface of the ruler along the middle line of a long side of the ruler. The circular arc radius measuring instrument has the advantages of reasonable structure, wide application, and is convenient for operation.
Description
Technical field the utility model relates to a kind of learning tool, especially measures apparatus.
Background technology is well-known, and people often need to calculate arc radius in study and work.But, also there is not a kind of survey instrument to measure arc radius quickly and accurately in the market, people can only use multiple survey instrument to unite arc radius is carried out, could draw arc radius at last substantially, yet bigger at the application operating time error, bring influence to study and work.
The summary of the invention the purpose of this utility model provides a kind of measuring accuracy height, the easy timesaving of metering system apparatus for measuring radius of circular arc.
The utility model mainly comprises protractor and ruler, and described protractor is a circular configuration, centers on the scale mark of 0~360 ° of the even marking of circumference in turn; At the protractor circle centre position axostylus axostyle is installed, the zero graduation place of axostylus axostyle one end and ruler is rotationally connected, and the stage casing of the other end and a bull stick is rotationally connected.Offer strip gab along the long limit of ruler center line on its surface.
During use, the user takes up an official post at circular arc to be measured and gets 1 A, the protractor center of circle is placed on the A point, and makes the center line opening of ruler and circular arc that another joining B be arranged, and reads length between AB by ruler again, and note is done " X ".Rotate bull stick then, make the bull stick of the center of circle one side and the circular arc of the same side thereof, at protractor edge folded lattice number and the bull stick of axle center opposite side and the circular arc of the same side thereof, the lattice number folded in protractor edge equates.The throughput hornwork is read the number of degrees of bull stick and the folded acute angle of ruler center line opening, and note is done " a ".At last with data substitution formula: R=X ÷ 2sina, can calculate circular arc to be measured place radius of a circle.
Compared with the prior art, the beneficial effects of the utility model are: rational in infrastructure, easy to operate, be widely used, can draw arc radius fast and accurately by formula and data.
Description of drawings Fig. 1 is a spatial structure sketch of the present utility model.
Fig. 2 is formula identity figure of the present utility model.
Embodiment mainly comprises protractor 1 and ruler 2 in spatial structure sketch of the present utility model shown in Figure 1, described protractor is a circular configuration, around the scale mark of 0~360 ° of the even in turn marking of circumference; Circle centre position at protractor is installed axostylus axostyle, and the zero graduation position of axostylus axostyle one end and ruler is rotationally connected, and the stage casing of the other end and a bull stick 3 is rotationally connected.Offer strip gab 4 along the long limit of ruler center line on its surface.
Shown in Fig. 2 formula identity figure:
Formula identity principle: take up an official post at AB top circular arc and to get 1 E, connect AE, BE.
Because: the bull stick of axle center one side and the circular arc of the same side thereof, follow the bull stick of center of circle opposite side and the circular arc of the same side thereof at the lattice number that protractor edge is folded, the lattice number folded at the protractor edge equates.
So: CD is tangent with circle O
∠AEB=∠a
So: in triangle ABE, AB=X, ∠ AEB=∠ a
Learn according to sine: 2R=(AB) ÷ (sin ∠ AEB)
R=X÷(2sina)
Claims (2)
1. an apparatus for measuring radius of circular arc comprises protractor (1) and ruler (2), it is characterized in that: described protractor (1) is a circular configuration, centers on the scale mark of 0~360 ° of the even marking of circumference in turn; At protractor (1) circle centre position axostylus axostyle is installed, the zero graduation place of axostylus axostyle one end and ruler (2) is rotationally connected, and the stage casing of the other end and a bull stick (3) is rotationally connected.
2. apparatus for measuring radius of circular arc according to claim 1 is characterized in that: offer strip gab (4) on its surface along the long limit of ruler (2) center line.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2010202552992U CN201803672U (en) | 2010-07-13 | 2010-07-13 | Circular arc radius measuring instrument |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2010202552992U CN201803672U (en) | 2010-07-13 | 2010-07-13 | Circular arc radius measuring instrument |
Publications (1)
Publication Number | Publication Date |
---|---|
CN201803672U true CN201803672U (en) | 2011-04-20 |
Family
ID=43873171
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN2010202552992U Expired - Fee Related CN201803672U (en) | 2010-07-13 | 2010-07-13 | Circular arc radius measuring instrument |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN201803672U (en) |
-
2010
- 2010-07-13 CN CN2010202552992U patent/CN201803672U/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: 20110420 Termination date: 20110713 |