CN2104135U - Multifunctional ruler for blackboard drawing - Google Patents
Multifunctional ruler for blackboard drawing Download PDFInfo
- Publication number
- CN2104135U CN2104135U CN 91214811 CN91214811U CN2104135U CN 2104135 U CN2104135 U CN 2104135U CN 91214811 CN91214811 CN 91214811 CN 91214811 U CN91214811 U CN 91214811U CN 2104135 U CN2104135 U CN 2104135U
- Authority
- CN
- China
- Prior art keywords
- ruler
- protractor
- straight
- blackboard
- angle
- 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.)
- Granted
Links
- 230000005484 gravity Effects 0.000 claims abstract description 8
- 238000013507 mapping Methods 0.000 claims description 2
- 230000003993 interaction Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Landscapes
- Drawing Aids And Blackboards (AREA)
Abstract
The utility model belongs to the articles for use for cultural and educational use is formed by ruler, semicircle protractor and gravity needle combination, and ruler and semicircle protractor are as an organic whole, and protractor diameter limit is parallel with ruler setting-out limit, and the rotation axis of gravity needle passes through the graduation centre of a circle of protractor. When straight lines with different inclination angles are drawn on the blackboard, the protractor is inclined along with the straight ruler. While the gravity needle is always downward. The angle indicated by the angle gauge is the inclination of the line drawing edge of the straight ruler. Therefore, the straight line, the two parallel straight lines, the two intersected straight lines, the regular polygon and the like with any inclination angle can be drawn quickly, and the speed and the accuracy of drawing on the blackboard are improved.
Description
The utility model belongs to school supply and stationery.
Though existing teaching set square has two for one pair, but be subjected to the restriction of its structure, only can on blackboard, draw out and the straight line that becomes 30 °, 45 °, 60 °, 90 ° to boning out, and can not accurately draw out horizontal line, plumb line and arbitrarily angled parallax, and push away parallel lines, it is also very inconvenient to make vertical line, so its function is limited.
The purpose of this utility model provides a kind of high-efficiency multi-function blackboard drawing tool simple in structure, easy to use.
Concrete structure of the present utility model is that ruler, semicircular protractor are integral.It is in the same plane.Make the diameter limit of half garden protractor parallel simultaneously, settle a straight pin at the calibration circle centre position of half garden protractor with the setting-out limit of ruler.A handle is installed in the outer end in the pin, the gravity pin that stage casing energy of suspension freely rotates.
Because ruler and half garden protractor are as one, therefore when making the straight line of different gradients with this chi on blackboard, semicircular protractor also tilts thereupon.And the gravity pin is downward all the time under graviational interaction, and its indicated angle in protractor can reflect the angle of inclination on ruler setting-out limit.
Further describe structure of the present utility model and operation principle below by accompanying drawing.
Fig. 1 is a front view of the present utility model.
Fig. 2 is a side view of the present utility model.
Fig. 3 to Fig. 6 is respectively and uses the utility model to make the example of 45 ° of oblique lines, 60 ° of oblique lines, 90 ° of vertical lines and two parallel lines.
Wherein: 1-blade, 2-gravity pin, 3-straight pin, 4-handle
As can be seen from Figure 1, straight line is carved with slide-rule dial on the blade, and 0 ° of line of semicircular protractor should be perpendicular to the setting-out limit of ruler, the left-right symmetry 90 ° of angle grooves that respectively distribute.When blade was made the straight line at various inclination angles on blackboard, the angle groove of protractor also rotated thereupon like this.This moment, down the indicated angle of gravity pin promptly reflected the angle of inclination on ruler setting-out limit all the time.Use this principle, the straight line at various given inclination angles that just can on blackboard, draw easily, parallel two straight lines, crossing two straight lines and similar figures, regular polygon etc., thus improve the speed and the degree of accuracy of mapping.
Claims (1)
1, a kind of instrument of blackboard mapping usefulness, form by ruler, half garden protractor and gravity pin, it is characterized in that: ruler and semicircular protractor are in the same plane, and the diameter limit of semicircular protractor should be parallel with ruler setting-out limit, and the rotation of gravity pin should be by the calibration center of semicircular protractor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91214811 CN2104135U (en) | 1991-08-08 | 1991-08-08 | Multifunctional ruler for blackboard drawing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91214811 CN2104135U (en) | 1991-08-08 | 1991-08-08 | Multifunctional ruler for blackboard drawing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2104135U true CN2104135U (en) | 1992-05-13 |
Family
ID=4922967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91214811 Granted CN2104135U (en) | 1991-08-08 | 1991-08-08 | Multifunctional ruler for blackboard drawing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2104135U (en) |
-
1991
- 1991-08-08 CN CN 91214811 patent/CN2104135U/en active Granted
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| 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 |