CN2042420U - Halving elliptic board - Google Patents
Halving elliptic board Download PDFInfo
- Publication number
- CN2042420U CN2042420U CN 89201245 CN89201245U CN2042420U CN 2042420 U CN2042420 U CN 2042420U CN 89201245 CN89201245 CN 89201245 CN 89201245 U CN89201245 U CN 89201245U CN 2042420 U CN2042420 U CN 2042420U
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- CN
- China
- Prior art keywords
- halving
- ellipse
- elliptic
- board
- equilibrium
- 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.)
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Abstract
The utility model discloses a halving elliptic board to draw the axonometric drawing. The halving elliptic board is provided with a 360 DEG division, directional lines of the long and the short shafts, a directional line of the axonometric shaft, and 11 ellipses with the same center and direction and the different lengths. The ellipses are respectively provided with different halving lines which divide the ellipses equally. The halving lines are determined according to the positive circular projection philosophy. The halving lines are provided with small holes. The halving elliptic board can directly divide the ellipse equally, satisfy the requirement that an integral key, a tooth gear and a worm gear within 20 teeth can be represented accurately, and can provide basis to the approximate representation to more than 20 teeth. Using the halving elliptic board can enhance the quality and speed of the drawing.
Description
The utility model relates to a kind of five equilibrium ellipse of drawing axonometric drawing.
Existing five equilibrium ellipse, the projection half-round compasses as Hamburg, the Federal Republic of Germany Luo Chun company produces has 360 ° of graduation, long and short direction of principal axis line and axonometric axis direction line on it.The weak point of this projection half-round compasses is, can not be with the direct five equilibrium arbitrarily of ellipse.
The purpose of this utility model provides the five equilibrium ellipse of the direct five equilibrium ellipse of a kind of energy.
Five equilibrium ellipse of the present utility model has following characteristics, 360 ° of graduation at the retaining projection half-round compasses, on the basis of long and short direction of principal axis line and axonometric axis direction line, increased by 11～15 with one heart, ellipse in the same way, the bisector of branch ellipses such as difference is arranged respectively on each ellipse, aperture is all arranged on the bisector.
Use branch ellipses such as existing projection half-round compasses, wait branch numerical value, utilize 360 ° of graduation interpretations then through calculating, so promptly complicated, time-consuming again, and effect is bad.Use five equilibrium ellipse of the present utility model, the five equilibrium of can directly fixing a point, for drafting spline, gear, worm gear lay the foundation, having satisfied generally speaking needs the accurately requirement of expression to 20 teeth with interior spline, gear, worm gear, also can be the above approximate representation of 20 teeth foundation is provided.Therefore, use ellipse such as branch such as this grade can improve the speed and the quality of drawing.
Accompanying drawing is a five equilibrium ellipse schematic diagram of the present utility model.
Further describe an embodiment of the present utility model below in conjunction with accompanying drawing.
On the five equilibrium ellipse of the present utility model long axis direction line 21 is arranged, short-axis direction line 22 and axonometric axis direction line 23, also have 11 ellipses 24, these oval ascending different five equilibriums that are painted with, its isodisperse is 11,12 or 6,13,14 or 7,15,16 or 8,17,18 or 9,19,20 or 10,, and 360, the position of every bisector can be made with positive circular projection principle, also available formula
tgφ＝cosε
1·tgφ
1
φ＝η＋φ
0
φ
1＝η
1＋φ
10
Obtain.
In the formula: the angle of φ-just round any radius vector projection and major axis
ε
1The angle on-positive disc and perspective plane
φ
1-just the circle any radius vector and the angle of major axis
η-ellipse is the angle of starting point with the axonometric axis
φ
0The angle of-axonometric axis and major axis
η
1-just circle is the angle of starting point with the reference axis
φ
10-just round the reference axis and the angle of major axis
The starting point of the bisector 25 of different five equilibriums is marked with an end of 0 ° at axonometric axis, indicates five equilibrium numeral 27 at the starting point place, and aperture 26 is arranged on each bisector, and its diameter can be 0.8mm, the time point point of being convenient to draw.
Ellipse such as branch such as this grade can be manufactured with transparent, on-deformable material (as organic glass), and its thickness can be 0.5～1mm.
Five equilibrium ellipse of the present utility model, its using method is, when five equilibrium is oval, wait the center of circle of branch ellipse to overlap the center of circle of ellipse such as branch such as this grade and quilt, the direction unanimity is when finding required five equilibrium digital, put a little one by one at aperture place on the ellipse of this isodisperse, by the center of circle and some line, crossing with the ellipse of required five equilibrium, its intersection point is Along ent then.
Claims (3)
1, a kind of five equilibrium ellipse of drawing axonometric drawing has 360 ° of graduation above, major and minor axis direction line and axonometric axis direction line, it is characterized in that, also have 11～15 with one heart, ellipse in the same way, these oval ascending different bisectors that are painted with all have aperture on the bisector.
2, five equilibrium ellipse according to claim 1, it is characterized in that, described with one heart, 11 oval in the same way of numbers be the best, and these oval ascending isodisperses are respectively 11,12 or 6,13,14 or 7,15,16 or 8,17,18 or 9,20 or 10,360, the starting point of the Along ent of its different five equilibriums is marked with an end of 0 at axonometric axis, indicates the five equilibrium numeral at the starting point place.
3, ellipse according to claim 2 is characterized in that, the hole diameter on each bisector can be 0.8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89201245 CN2042420U (en) | 1989-02-01 | 1989-02-01 | Halving elliptic board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89201245 CN2042420U (en) | 1989-02-01 | 1989-02-01 | Halving elliptic board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2042420U true CN2042420U (en) | 1989-08-09 |
Family
ID=4859184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89201245 Withdrawn CN2042420U (en) | 1989-02-01 | 1989-02-01 | Halving elliptic board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2042420U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107097569A (en) * | 2017-06-20 | 2017-08-29 | 屈雷涛 | One kind teaching picture circle and oval apparatus |
-
1989
- 1989-02-01 CN CN 89201245 patent/CN2042420U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107097569A (en) * | 2017-06-20 | 2017-08-29 | 屈雷涛 | One kind teaching picture circle and oval apparatus |
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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 |