CN203472354U - Protractor - Google Patents
Protractor Download PDFInfo
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- CN203472354U CN203472354U CN201320562356.5U CN201320562356U CN203472354U CN 203472354 U CN203472354 U CN 203472354U CN 201320562356 U CN201320562356 U CN 201320562356U CN 203472354 U CN203472354 U CN 203472354U
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- protractor
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Abstract
The utility model discloses a protractor. The protractor comprises a first protractor body and a second protractor body, wherein the first protractor body and the second protractor body are hinged together through a hinge pin at the position of the center of a circle, the second protractor body is located above the first protractor body, and a groove for allowing scales of the first protractor body to be exposed is formed in the edge of a zero scale of the second protractor body. The protractor is simple in structure, convenient to use and high in accuracy, and is used for measuring angle values.
Description
Technical field
The utility model relates to a kind of study appurtenance, particularly a kind of protractor.
Background technology
Protractor is a kind of conventional mathematical studying appurtenance, and it is mainly used in taking measurement of an angle.Existing protractor is when taking measurement of an angle, there is following shortcoming: 1) when needs are drawn a known angle, first need picture straight line, and then by the zero graduation line of protractor and this aligned, and the center of circle of protractor and an endvertex of straight line are alignd, then on protractor, select known angle, mark is carried out in relevant position in protractor periphery, then adopt ruler to connect centre point and the ready-made mark strokes and dots straight line of straight line, just can make the angle that requires picture, so step is comparatively loaded down with trivial details.2) owing to being provided with scale on the inner ring at protractor semi-circumference edge and outer ring, for the student who begins to learn angulation, easily there is mistake.3) when measuring the shorter angle in limit, the length of straight line be can't reach scale, therefore reading angular value that also just cannot be correct, now must extend line segment could read exactly, understands like this because extended line and straight line do not cause angle to read the error that generation is necessary point-blank.4) on common protractor, only have scale to show, there is no reading reference substance, therefore can owing to the reason such as rocking, to cause angle to read inaccurate.
Summary of the invention
The technical problem that the utility model solves is to provide a kind of simple in structure, easy to use, and angle reads the higher protractor of the degree of accuracy.
For solving the problems of the technologies described above, technical solution adopted in the utility model is as follows.
A protractor, comprises that circle centre position passes through the first hinged protractor of bearing pin and the second protractor, and described the second protractor is positioned at the top of the first protractor, and the zero graduation edge of the second protractor is provided with the groove that appears the first protractor scale value.
Improvement of the present utility model is: the groove edge of described the second protractor is pasted with red identification strip.
Owing to having adopted above technical scheme, the obtained technological progress of the utility model is as follows.
The utility model is simple in structure, while using the utility model reading angular, only the zero graduation line of the first protractor need be alignd with a limit, around bearing pin, rotate the second protractor, the zero graduation line of the second protractor is alignd with other straight line, then the scale value that reads corresponding first protractor of groove at the second protractor zero degree line edge, is the angle value that will measure, very easy to use.The utility model as reading reference substance, and arranges red identification strip at groove edge by groove, can greatly reduce the read untrue rate causing due to human factor in the process of taking measurement of an angle, and improves the degree of accuracy that angle value reads.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Wherein: 1. the first protractor, 2. the second protractor, 3. groove, 4. bearing pin.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is further elaborated.
A protractor, its structure as shown in Figure 1, comprise that the center of circle of the first protractor 1 and the second protractor 2, the first protractors 1 and second protractor 2 centers of circle are hinged by bearing pin 4, and the second protractor 2 is positioned at the top of the first protractor 1.
The zero graduation edge of the second protractor 2 arranges a groove 3, for appearing the scale value of the first protractor.Groove edge is pasted with red identification strip, so that people read the angle value of the first protractor intuitively.
When the utility model is used, first the zero graduation line of the first protractor is alignd with a limit, around bearing pin, rotate the second protractor, the zero graduation line of the second protractor is alignd with other straight line, then read the scale value of corresponding first protractor of groove at the second protractor zero degree line edge, be the angle value that will measure, very easy to use.
Claims (2)
1. a protractor, it is characterized in that: comprise that circle centre position passes through hinged the first protractor (1) of bearing pin (4) and the second protractor (2), described the second protractor (2) is positioned at the top of the first protractor (1), and the zero graduation edge of the second protractor (2) is provided with the groove (3) that appears the first protractor scale value.
2. protractor according to claim 1, is characterized in that: the groove edge of described the second protractor is pasted with red identification strip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320562356.5U CN203472354U (en) | 2013-09-11 | 2013-09-11 | Protractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320562356.5U CN203472354U (en) | 2013-09-11 | 2013-09-11 | Protractor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203472354U true CN203472354U (en) | 2014-03-12 |
Family
ID=50220752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320562356.5U Expired - Fee Related CN203472354U (en) | 2013-09-11 | 2013-09-11 | Protractor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203472354U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112113491A (en) * | 2020-08-31 | 2020-12-22 | 福建圣泽生物科技发展有限公司 | Poultry chest angle ware |
| CN112504087A (en) * | 2020-11-20 | 2021-03-16 | 河南航天精工制造有限公司 | Outer chamfer angle measuring device |
-
2013
- 2013-09-11 CN CN201320562356.5U patent/CN203472354U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112113491A (en) * | 2020-08-31 | 2020-12-22 | 福建圣泽生物科技发展有限公司 | Poultry chest angle ware |
| CN112113491B (en) * | 2020-08-31 | 2022-05-24 | 福建圣泽生物科技发展有限公司 | Poultry chest angle ware |
| CN112504087A (en) * | 2020-11-20 | 2021-03-16 | 河南航天精工制造有限公司 | Outer chamfer angle measuring device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20140911 |
|
| EXPY | Termination of patent right or utility model |