CN203310324U - Concave angle protractor - Google Patents
Concave angle protractor Download PDFInfo
- Publication number
- CN203310324U CN203310324U CN2013203811818U CN201320381181U CN203310324U CN 203310324 U CN203310324 U CN 203310324U CN 2013203811818 U CN2013203811818 U CN 2013203811818U CN 201320381181 U CN201320381181 U CN 201320381181U CN 203310324 U CN203310324 U CN 203310324U
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- CN
- China
- Prior art keywords
- angle
- protractor
- prismatic
- measurement
- utility
- 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)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The utility model discloses a concave angle protractor. By using a current protractor, a concave angle in a plane angle of a dihedral angle can not be measured. By using the protractor of the utility model, the above problem is solved. The protractor comprises a protractor body, an angle pointer, a shaft pin and a prismatic measurement angle apparatus. During measurement, an angle size of the concave angle can be reflected on the angle pointer. An angle value is read through an angle scale of the protractor body. By using the protractor provided in the utility model, the structure is reasonable; usage is simple; the protractor is very convenient and practical.
Description
Technical field
A kind of measurement mechanism of the utility model design, be specifically related to a kind of protractor.
Background technology
Protractor of the prior art, due to design, can not measure the dihedral angle in daily life and engineering, as the angle in corner etc.
Summary of the invention
The shortcoming existed for overcoming above-mentioned prior art, the purpose of this utility model are to provide a kind of instrument when measuring dihedral angle and being re-entrant angle.
The technical solution of the utility model is: this kind re-entrant angle protractor is characterized in that: comprise protractor body, angle indicator, pivot pin and the prismatic device that takes measurement of an angle.Take measurement of an angle four summits of device of prismatic connect for rotatable.Angle indicator is arranged on the center of circle of protractor body by pivot pin.The prismatic device that takes measurement of an angle, wherein a limit overlaps with 180 degree limits of transparent graphometer, and the summit in the close protractor body center of circle is arranged on the center of circle of protractor body by pivot pin, connects another limit and the angle indicator conllinear on this summit.
When measuring re-entrant angle, the take measurement of an angle tip of device of prismatic is inserted in re-entrant angle, during insertion, guarantee that prismatic takes measurement of an angle plane, device place perpendicular to the intersection of two half-planes that form re-entrant angle, and take measurement of an angle two limits of angle measurement end of device of prismatic fit tightly with two half-planes that form re-entrant angle.As can be known according to mathematical knowledge, the re-entrant angle angle of now measuring is just indicated on protractor by pointer.
The beneficial effects of the utility model are: solved the difficult problem that common protractor can not be measured the angle of the re-entrant angles such as corner for example.
The accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is elaborated.
Fig. 1 is front view of the present utility model.
In figure, 1-protractor body, 2-angle indicator, 3-pivot pin, the 4-prismatic device that takes measurement of an angle.
Embodiment
In the drawings, the protractor body has the angle groove above (1), in the center of circle of described protractor body by rotating the take measurement of an angle one side of device (4) of an angle indicator (2) and prismatic of fixing of pivot pin (3).
Take measurement of an angle four summits of device (4) of described prismatic connect for rotatable.
The described prismatic device (4) that takes measurement of an angle, wherein a limit overlaps with 180 degree limits of transparent graphometer, summit near protractor body (1) center of circle is arranged on the center of circle of protractor body by pivot pin (3), connects another limit and angle indicator (2) conllinear on this summit.
When measuring re-entrant angle, the take measurement of an angle tip of device (4) of prismatic is inserted in re-entrant angle, during insertion, guarantee that prismatic takes measurement of an angle plane, device place perpendicular to the intersection of two half-planes that form re-entrant angle, and take measurement of an angle two limits of angle measurement end of device (4) of prismatic fit tightly with two half-planes that form re-entrant angle.As can be known according to mathematical knowledge, the re-entrant angle angle of now measuring is just indicated on protractor body (1) by angle indicator (2).
Claims (1)
1. re-entrant angle protractor, it is characterized in that: comprise protractor body (1), angle indicator (2), pivot pin (3) and the prismatic device (4) that takes measurement of an angle, take measurement of an angle four summits of device (4) of prismatic connect for rotatable, angle indicator (2) is arranged on the center of circle of protractor body (1) by pivot pin (3), take measurement of an angle wherein limit of device (4) of prismatic overlaps with 180 degree limits of transparent graphometer, summit near protractor body (1) center of circle is arranged on the center of circle of protractor body by pivot pin (3), another limit and angle indicator (2) conllinear that connect this summit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203811818U CN203310324U (en) | 2013-06-30 | 2013-06-30 | Concave angle protractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203811818U CN203310324U (en) | 2013-06-30 | 2013-06-30 | Concave angle protractor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203310324U true CN203310324U (en) | 2013-11-27 |
Family
ID=49616527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203811818U Expired - Fee Related CN203310324U (en) | 2013-06-30 | 2013-06-30 | Concave angle protractor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203310324U (en) |
-
2013
- 2013-06-30 CN CN2013203811818U patent/CN203310324U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131127 Termination date: 20140630 |
|
| EXPY | Termination of patent right or utility model |