CN2448574Y - Protractor - Google Patents
Protractor Download PDFInfo
- Publication number
- CN2448574Y CN2448574Y CN 00256095 CN00256095U CN2448574Y CN 2448574 Y CN2448574 Y CN 2448574Y CN 00256095 CN00256095 CN 00256095 CN 00256095 U CN00256095 U CN 00256095U CN 2448574 Y CN2448574 Y CN 2448574Y
- Authority
- CN
- China
- Prior art keywords
- straight line
- central point
- point
- substrate
- base plate
- 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
Links
Landscapes
- Length-Measuring Instruments Using Mechanical Means (AREA)
Abstract
The utility model relates to a protractor. A center point and angle graduation lines surrounding the center point are arranged on a base plate; through point holes are arranged in the connecting straight line direction of the center point and the angle graduation lines of the base plate. A straight line is arranged on the base plate at the horizontal direction passing through the center point; the straight line is provided with the through point holes comprising the center point; straight line graduations are arranged at the horizontal direction corresponding to the straight line. A straight line with graduations is arranged on the base plate at the vertical direction passing through a center line; the through point holes are arranged on the graduations. The through point holes having different distances with the center point are arranged on the base plate. The utility model can be used for drawing straight lines, coordinates lines, triangles, and circles, and has the advantages of accurate positioning, speediness, convenience, simple structure, and multifunction.
Description
The utility model relates to a kind of utensil that takes measurement of an angle.
Present seen protractor is for central point being arranged and having the protractor of angle index all around.Behind selected angle, when needing picture point deckle, owing to need corresponding scale to draw point, the position of point is inaccurate, and operation is also inconvenient, and time-consuming.This protractor function is also single relatively.
The purpose of this utility model provides a kind of protractor, when making the picture angle, determines that the position, both sides at angle is accurate, and speed is fast.And can realize the picture coordinate line and draw the circle function.
The purpose of this utility model realizes as follows: this protractor has central point and centers on the angle index line of central point on substrate, in the central point and being connected of angle index line of substrate penetrating some hole is arranged on the rectilinear direction.When drawing the limit at angle, be inserted in nib or needle point in the some hole of selected angle like this, just can on the paper of bottom or other article, leave a trace, convenient rapidly.
One straight line is arranged on the horizontal direction by central point on the substrate, the penetrating some hole that comprises central point arranged on this straight line, on this straight line corresponding horizontal direction, slide-rule dial is arranged, the straight line of band scale is arranged on the vertical direction by central point on the substrate, penetrating some hole is arranged on the scale of this vertical line.So just, can draw straight line, coordinate line and triangle.
On substrate, have and penetrating different hole of central point distance.Be that radius can be justified with central point and any hole or any two holes like this, substitute compasses.
The advantage that protractor of the present utility model has: accurate positioning, quick and convenient when drawing the angle.And can be used for picture straight line, coordinate line, triangle and circle, simple in structure, function is many.
Below in conjunction with accompanying drawing the utility model is further described.
Accompanying drawing is the structural representation of the utility model protractor.
With reference to accompanying drawing, this protractor is a semi-circular shape, can make of transparent material.There is penetrating central point 2 centre at substrate 1 diameter, and the angle index line of 0～180 degree is arranged at the edge of semicircle, in the central point 2 and being connected of angle index line of substrate 1 penetrating some hole 3 is arranged on the rectilinear direction.By central point 2 horizontal linear is arranged, this straight-line pass 0 degree and 180 degree grooves have the penetrating some hole that comprises central point 2 on this straight line, on this straight line corresponding horizontal direction slide-rule dial is arranged.The straight line 4 of band scale is arranged on the vertical direction by central point 2 on the substrate 1, penetrating some hole 5 is arranged on the scale of this vertical line 4, this vertical line 4 is by 90 degree graduation marks.On substrate 1, have and penetrating different hole 6 of central point 2 distances, between this hole 6 and central point 2, can connect graduation mark, to determine the radius of a circle of being done.
Claims (3)
1, a kind of protractor has central point on substrate and around the angle index line of central point, it is characterized in that: there are penetrating some hole (3) central point (2) and being connected of angle index line in substrate (1) on the rectilinear direction.
2, protractor according to claim 1, it is characterized in that: upward on the horizontal direction by central point (2) straight line is arranged at substrate (1), the penetrating some hole that comprises central point (2) arranged on this straight line, on this straight line corresponding horizontal direction, slide-rule dial is arranged, upward on the vertical direction by central point (2) straight line (4) of being with scale is arranged at substrate (1), penetrating some hole (5) is arranged on the scale of this vertical line (4).
3, protractor according to claim 1 and 2 is characterized in that: have on substrate (1) and the different penetrating some holes (6) of central point (2) distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00256095 CN2448574Y (en) | 2000-10-21 | 2000-10-21 | Protractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00256095 CN2448574Y (en) | 2000-10-21 | 2000-10-21 | Protractor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2448574Y true CN2448574Y (en) | 2001-09-19 |
Family
ID=33612883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00256095 Expired - Fee Related CN2448574Y (en) | 2000-10-21 | 2000-10-21 | Protractor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2448574Y (en) |
-
2000
- 2000-10-21 CN CN 00256095 patent/CN2448574Y/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 | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |