WO2018145613A1

WO2018145613A1 - Curve drawing and measurement tool

Info

Publication number: WO2018145613A1
Application number: PCT/CN2018/075277
Authority: WO
Inventors: 满洪流
Original assignee: 满洪流; 万华
Priority date: 2017-02-07
Filing date: 2018-02-05
Publication date: 2018-08-16
Also published as: CN106739686A; CN106739686B

Abstract

A curve drawing and measurement tool are provided. On the bases of the basic principle of the parabolic five-point drawing method, elasticity of a stainless steel scale (18) made of a strip-shaped ultra-thin stainless steel sheet is used to make the stainless steel scale (18) smoothly bend to be a desired parabolic shape and then to draw a parabolic pattern along the outside of the stainless steel scale (18). With this tool, a parabola, a hyperbola, an ellipse, a circle, and other curves can be drawn quickly and easily, and the length of the curve can be measured. The tool also has traditional functions of a protractor and a ruler, and can be used to draw any geometry.

Description

Curve mapping and measurement tools

Technical field

The present invention relates to a teaching mapping tool, in particular a curve mapping and measurement tool.

Background technique

The compass can draw the circle easily, but the parabola, hyperbola, ellipse can't be drawn, junior high school math class The process involves a large number of parabolic, hyperbolic, elliptical and other curve mapping problems, but currently there is no tool in the domestic and foreign markets that can draw these graphics simply and quickly. Students and teachers only draw these curves by hand, neither beautiful nor accurate. The existing individual curve drawing invention tools are also mainly based on the definition of the curve, and the drawing is performed with a tight thin line, which is inconvenient and not fast to operate.

The length of the line can be measured in a straight scale, but the length of the curve has never been measured. When the student asks the length of the curve, the teacher cannot answer.

Summary of the invention

The curve drawing and measuring tool of the invention can conveniently and quickly draw parabola, hyperbola, ellipse, circle and other curves, solve the problem that the middle school students and teachers draw the curve without tools, and can also measure the length and arc of the curve. The central angle of the segment, which has the traditional protractor and ruler function, can draw any geometric figure. In the future, it can become a common mapping tool for middle school students.

The technical solution adopted by the invention solves the technical problem: according to the basic principle of the parabolic five-point drawing method, the fixed vertex, the left and right fixed points and the left and right auxiliary fixed points are five points, and the stainless steel scale made of the strip-shaped ultra-thin stainless steel sheet is used. The elasticity, determine the shape of the parabola, and then draw a parabola along the outside of the stainless steel scale with a pencil, pen or ballpoint pen. It is also possible to fix three points, that is, the fixed apex and the left and right fixed points use the elasticity of the stainless steel scale to bend the stainless steel scale into a parabola, and then draw a parabolic pattern along the outer side of the stainless steel scale. You can also fix two points, that is, the left and right fixed points, use the elasticity of the stainless steel scale to bend the stainless steel scale into a parabola, and then draw a parabola along the inner side of the stainless steel scale; apply this technique to the hyperbola to draw a double One of the curves, then another; to apply this technique to the ellipse, you can make half of the ellipse, then copy the other half, of course, you can draw circles and other curves.

Since the stainless steel scale has a scale on both sides, the length of the drawn curve can be directly read, so it is also a measuring tool for the curved section. The round body is also a protractor, and the central angle corresponding to the arc segment can be read.

Fix the right end of the stainless steel scale to the right fixed slide bar, and the left fixed end point is designed as a live card slot for easy removal of the stainless steel scale. Press the ruler on the table. You can draw any angle by using the protractor on the round body. Geometry such as triangles.

The invention has the following beneficial effects: the invention solves the problem that the curve drawing has no common tools all the time, and also solves the problem that the curve has no common measurement tools, filling a blank of the teaching tool, and its structure Simple and easy to operate, you can draw the curve or measure the length of the curve as you like. It is of great help to students to learn and understand parabola (quadratic function), hyperbolic (inverse proportional function), ellipse, circle and other curves, especially to enhance the perceptual knowledge of these knowledge, suitable for middle and high school students and teachers at home and abroad. Make a graph. Every middle school student at home and abroad needs such a curve mapping and measurement tool, which has great business opportunities.

DRAWINGS

Figure 1: Diagram of the state of the curve, which is a schematic diagram of the structure of the curve mapping and measurement tools;

Figure 2: Schematic diagram of the curve mapping and measurement tools in the drawing box, which is placed in the pencil case;

Figure 3: Structure diagram of the apex fixed slider;

Figure 4: Structure diagram of other fixed sliders.

In Figure 1, 1, the round body; 2, the center hole of the circle; 3, the fixed point of the curve apex; 4, the fixed point of the left end of the curve; 5, the fixed point of the right end of the curve; 6, the left auxiliary fixed point; 7, the right auxiliary Fixed point; 8, vertice fixed slide; 9, left fixed slide; 10, right fixed slide; 11, left auxiliary fixed slide; 12, right auxiliary fixed slide; 13, apex fixed slide; Fixed slide bar; 15. Right fixed sliding rod; 16, left auxiliary fixed sliding rod; 17, right auxiliary fixed sliding rod; 18, stainless steel scale: made of strip-shaped ultra-thin stainless steel sheet, stainless steel scale with scale on both sides; 19, stainless steel scale terminal buttonhole; 20, the round body protractor.

Figure 3, Figure 4, 21 fixed end points; 22, the upper end of the sliding rod.

detailed description

Figure 1 is the drawing state; when drawing, the center hole 2 of the circle body in the circular body 1 is determined to be a good position; according to the need of drawing, the fixed curve vertex fixed point 3, the fixed curve left end fixed point 4, the fixed curve right end Fixed point 5, fixed left auxiliary fixed point 6, fixed right auxiliary fixed point 7, fixed at five points; fixed apex fixed slide 13 in the apex fixed slide 8 when fixing the above five points, which is embedded in the fixed slide 8 The one-way body is easy to slide out in the outer body, and sliding to the outside of the circle will be stuck and fixed. It is necessary to pinch the upper end 22 of the sliding rod and adjust the length of the fixed sliding rod 13. Similarly, the left fixed slide 9 The fixed slide bar 14 is adjusted in the middle, the fixed slide bar 15 is adjusted in the right fixed slide 10, the fixed slide bar 16 is adjusted in the left auxiliary fixed slide 11, and the fixed slide 17 is adjusted in the right auxiliary fixed slide 12; The scale 18 is fixed by the above five points to form a curve, and then a curve is drawn with a pencil or a pen along the outside of the stainless steel scale 18. Since the stainless steel scale 18 has a scale on both sides, it is convenient to read the length of the curved section. When not in use, the length of the stainless steel scale 18 is the circumference of the body circle 1, one end is fixed on the right fixing point 5, and the other end is fastened on the terminal buttonhole 19, which looks like FIG. 2, and is conveniently placed in the pencil case. Since the left end fixing point 4 of the stainless steel scale 18 is a live card slot, the stainless steel scale 18 is taken out, and a straight ruler is pressed on the table. The protractor 20 on the body circle can draw any geometric shape such as a triangle.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structural transformations made by the present invention and the contents of the drawings, or directly/indirectly The relevant technical fields are all included in the scope of patent protection of the present invention.

Claims

A curve drawing and measuring tool, comprising: the circular body (1); the center hole of the circular body (2); the fixed point of the curve apex (3); the fixed point of the left end of the curve (4) ); fixed point at the right end of the curve ( 5 ); left auxiliary fixed point ( 6 ); right auxiliary fixed point ( 7 ); apex fixed slide ( 8 ); left fixed point slide ( 9 ); right fixed point slide ( 10 ) ); left auxiliary fixed point slide (11); right auxiliary fixed point slide (12); apex fixed slide (13); left fixed point slide (14); right fixed point slide (15) ); left auxiliary fixed point slider (16); right auxiliary fixed point slider (17); stainless steel scale (18); stainless steel tape measure terminal grommets (19); this round body protractor (20 ).
Claims 1 The curve mapping and measurement tool is characterized in that, according to the five-point drawing method of the parabola, the elasticity of the stainless steel scale is used to fix the upper five points, and the stainless steel scale is bent into a parabola, and the stainless steel scale is drawn outside. A parabolic pattern is drawn and the length of the drawn curve is read directly from the stainless steel scale. Hyperbolic, elliptical, circular and other curves can also be drawn using this technique.
The curve mapping and measurement tool according to claim 1, wherein five points can be fixed, that is, a vertex fixed point (3), a left fixed point (4), and a right fixed point ( 5), left auxiliary fixed point (6) and right auxiliary fixed point (7); or three fixed points, namely apex fixed point (3), left fixed point (4) and right fixed point (5), using stainless steel scale ruler( 18) The elasticity of the stainless steel scale is curved and the curve is drawn along the outside of the stainless steel scale.
The curve mapping and metrology tool of claim 1 wherein two points are fixed, namely a left fixed point (4) and a right fixed point (5). ), using the elasticity of the stainless steel scale (18), the stainless steel scale is bent into a curve, and the curve is drawn along the inner side of the stainless steel scale.
The curve mapping and metrology tool of claim 1 characterized by a stainless steel scale (18) ) Both sides have scales, which are convenient for reading the length of the curve. It is a measurement tool for the curve. It is convenient to read the central angle of the arc segment by using the protractor (20) on the circle.
The curve drawing and measuring tool according to claim 1, wherein the stainless steel scale can be used as a ruler (18) for the round body protractor (20) ) You can make geometric shapes such as triangles.