Physical drawing tool for demonstrating first definition of parabola

Abstract

By means of the object drawing tool for demonstrating the first definition of the parabola, the problem that an object drawing tool for demonstrating the first definition of the parabola is lacked in the prior art is solved, the new object drawing tool for demonstrating the first definition of the parabola is provided, and the vacancy in the aspect is filled. The invention provides a real object drawing tool for demonstrating a first definition of a parabola, and the tool comprises a pedestal which can be fixed on a blackboard; the rods comprise a first rod, a second rod, a third rod and a fourth rod; the movable handle is provided with double pulleys capable of being adjusted by 720 degrees; two steel wires capable of stretching out and drawing back synchronously are arranged in a main body of the telescopic double steel wires. According to the method and the device, the problem that a real object drawing tool for demonstrating the first definition of the parabola is relatively lacked in related technologies is solved, a novel real object drawing tool for demonstrating the first definition of the parabola is provided, and the vacancy in the aspect is filled.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of teaching tools, in particular to a physical drawing tool for demonstrating the first definition of a parabola. BACKGROUND

[0002] Conic curves generally include ellipses, hyperbolas and parabolas, a physical drawing tool for demonstrating the first definition of an ellipse is generally a rope, and a physical drawing tool for demonstrating the first definition of a hyperbola is generally a zipper, but the inventor has found that physical drawing tools for demonstrating the first definition of a parabola are relatively lacking. SUMMARY

[0003] The present application provides a physical drawing tool for demonstrating the first definition of a parabola, which solves the problem of the relative lack of physical drawing tools for demonstrating the first definition of a parabola in the related art.

[0004] According to one aspect of the present application, a physical drawing tool for demonstrating the first definition of a parabola is provided, comprising: a base that can be fixed on a blackboard; a rod comprising a first rod, a second rod, a third rod and a fourth rod, the first rod being marked with a scale, the second rod being fixed perpendicularly to the first rod, the third rod being perpendicular to the first rod at a midpoint and being capable of determining a specific position according to the scale on the first rod, the fourth rod being perpendicular to the second rod and the third rod and being capable of sliding on the second rod and the third rod; a moving handle capable of sliding on the fourth rod, the moving handle being provided with a double pulley capable of being adjusted by 720 degrees, and a chalk mounting opening being left on a side of the moving handle facing the blackboard; and a telescopic double steel wire, a main body of the telescopic double steel wire being fixed near the midpoint of the first rod, the main body having two steel wires, a first steel wire and a second steel wire, capable of being synchronously telescoped, the two steel wires extending out of the main body, passing through the double pulley and then extending in different directions, an end of the first steel wire being fixed at a connection between the third rod and the fourth rod, and an end of the second steel wire being fixed on the first rod and being capable of determining a specific position according to the scale on the first rod.

[0005] Further, the specific position determined according to the scale on the first rod refers to that the midpoint of the third rod and the end of the second steel wire are respectively on the two sides of the midpoint of the first rod and the distance from the midpoint of the first rod is equal. When the retractable double steel wire is retracted to the shortest, it is the initial state, at this time, the moving handle is near the connection of the first rod and the second rod. When the moving handle is moved outward, the fourth rod is moved together, and the two steel wires are kept straight through the sliding of the moving handle on the fourth rod, thereby meeting the requirement of equal distance in the definition of the parabola, and realizing dynamic demonstration. During the dynamic demonstration, the fourth rod and the moving handle can be fixed at any position through the knob, thereby realizing static demonstration. After the dynamic demonstration is completed, the moving handle or the fourth rod is slid to the edge, at this time, the chalk in the chalk mounting port has drawn half of the image, and the other half of the image is completed by the same method. Before drawing the other half of the image, the fourth rod and the moving handle are returned to the initial state together from the other end of the second rod and the third rod.

[0006] The physical drawing tool for demonstrating the first definition of the parabola provided by the present application solves the problem of lack of physical drawing tools for demonstrating the first definition of the parabola in the related art, provides a new physical drawing tool for demonstrating the first definition of the parabola, and fills the gap in this aspect. BRIEF DESCRIPTION OF DRAWINGS

[0007] The drawings constituting a part of the present application are used to provide further understanding of the present application, the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings: Figure 1 is a schematic diagram of a physical drawing tool for demonstrating the first definition of an ellipse according to the related art of the present application; Figure 2 is a schematic diagram of a physical drawing tool for demonstrating the first definition of a hyperbola according to the related art of the present application; Figure 3 is a schematic diagram of a physical drawing tool for demonstrating the first definition of a parabola according to an embodiment of the present application Figure 1 ; Figure 4 is a schematic diagram of a physical drawing tool for demonstrating the first definition of a parabola according to an embodiment of the present application Figure 2 ; DETAILED DESCRIPTION

[0008] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0009] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0010] It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0011] In the present embodiment, a physical mapping tool for demonstrating the first definition of parabola is provided, Figure 3 The schematic diagram of the physical mapping tool for demonstrating the first definition of parabola according to the embodiment of the present application is shown in Figure 3 The schematic diagram includes the following structures: Structure S102, base, which can be fixed on a blackboard; Structure S104, rod, including a first rod, a second rod, a third rod and a fourth rod, the first rod is marked with a scale, the second rod is fixed perpendicularly to the first rod, the third rod is perpendicular to the first rod at the midpoint and can determine the specific position according to the scale on the first rod, and the fourth rod is perpendicular to the second rod and the third rod and can slide on the second rod and the third rod; Structure S106, moving handle, which can slide on the fourth rod, the moving handle is equipped with a 720-degree adjustable double pulley, and a chalk mounting port is left on the side of the moving handle facing the blackboard; Structure S108, telescopic double steel wire, the main body of which is fixed near the midpoint of the first rod, the main body has two steel wires, including a first steel wire and a second steel wire, which can be telescoped synchronously, the two steel wires extend out of the main body, pass through the double pulley, and then extend in different directions, the end of the first steel wire is fixed at the connection between the third rod and the fourth rod, and the end of the second steel wire is fixed on the first rod and can determine the specific position according to the scale on the first rod.

[0012] Through the above structure, the elements related to the first definition of parabola such as coordinate system, directrix, focus, moving point and distance can be demonstrated on the blackboard with the real object, and both dynamic demonstration and static demonstration can be realized, thus solving the problem of lack of real object drawing tool for demonstrating the first definition of parabola in the related art, providing a new real object drawing tool for demonstrating the first definition of parabola, and filling the gap in this aspect.

[0013] When the elements related to the first definition of parabola are demonstrated on the blackboard, there can be many ways. That is, the position of the real object drawing tool can be freely selected, the up-down and left-right directions can be adjusted at will, and the distance between the directrix and the focus can be grasped as needed, and then different positions, different directions and different shapes of parabola can be demonstrated according to the first definition, thus solving the related problems and achieving the corresponding effects.

[0014] There are still many operation details in the drawing process of the real object demonstrating the first definition of parabola, and several explanations are provided in the embodiment.

[0015] In the embodiment, the specific position determined according to the scale on the first rod in the structure S104 and the structure S108 refers to that the midpoint of the third rod and the end of the second steel wire are respectively on both sides of the midpoint of the first rod and the distance from the midpoint of the first rod is equal. This operation method can ensure that the vertex of the parabola is at the coordinate origin, and improves the consistency and standardization of the real object demonstration drawing.

[0016] The retractable double steel wires in the structure S108 are in the initial state when they are retracted to the shortest, and at this time, the moving handle is near the connection between the first rod and the second rod. When the moving handle is moved outward, the fourth rod will be moved together, and the two steel wires can be controlled to be always straight through the sliding of the moving handle on the fourth rod, thus meeting the requirement of equal distance in the definition of parabola and realizing dynamic demonstration. During the dynamic demonstration, the fourth rod and the moving handle can be fixed at any position through the knob, thus realizing static demonstration. After the dynamic demonstration is completed, the moving handle or the fourth rod will slide to the edge, and at this time, the chalk in the chalk mounting port has drawn half of the image, and the other half of the image is completed by the same method. Before drawing the other half of the image, the fourth rod and the moving handle need to be returned to the initial state together from the other end of the second rod and the third rod. This operation method can ensure that the equal distance feature in the first definition of parabola can be reflected whether in dynamic or static state, and the demonstration is intuitive and visual, but requires certain operation skills.

[0017] The base in the structure S102 can be various, for example, can be two strong magnetic bases, installed at both ends of the first rod, which is more convenient to use.

Claims

1. A physical plotter for demonstrating the first definition of a parabola, characterized by, The utility model relates to a blackboard writing device, including: a base which can be fixed on a blackboard; a rod including a first rod, a second rod, a third rod and a fourth rod, the first rod is marked with a scale, the second rod is fixed perpendicularly to the first rod, the third rod is perpendicular to the first rod at the midpoint and can determine the specific position according to the scale on the first rod, the fourth rod is perpendicular to the second rod and the third rod and can slide on the second rod and the third rod; a moving handle which can slide on the fourth rod, the moving handle is equipped with a 720-degree adjustable double pulley, and a chalk mounting port is left on the side of the moving handle facing the blackboard; a telescopic double steel wire, the main body of the telescopic double steel wire is fixed near the midpoint of the first rod, the main body has two steel wires which can be telescoped synchronously, including a first steel wire and a second steel wire, the two steel wires extend out of the main body, pass through the double pulley and then extend in different directions, the end of the first steel wire is fixed at the connection between the third rod and the fourth rod, and the end of the second steel wire is fixed on the first rod and can determine the specific position according to the scale on the first rod.

2. The physical graphing tool for demonstrating the first definition of a parabola of claim 1, wherein, Determine the specific position according to the scale on the first rod refers to that the midpoint of the third rod and the end of the second steel wire are respectively on the two sides of the midpoint of the first rod and the distances from the midpoint of the first rod are equal.

3. The physical graphing tool for demonstrating the first definition of a parabola of claim 1, wherein, When the telescopic double steel wire is the shortest, it is in the initial state, and at this time, the moving handle is near the connection between the first rod and the second rod.

4. The physical graphing tool for demonstrating the first definition of a parabola of claim 1, wherein, When the moving handle is moved outward, the fourth rod is moved together, and the two steel wires can be kept straight through the sliding of the moving handle on the fourth rod, thereby meeting the requirement of equal distance in the definition of the parabola and realizing dynamic demonstration.

5. The physical graphing tool for demonstrating the first definition of a parabola of claim 4, wherein, During the dynamic demonstration, the fourth rod and the moving handle can be fixed at any position through the knob, thereby realizing static demonstration.

6. The physical graphing tool for demonstrating the first definition of a parabola of claim 4, wherein, After the dynamic demonstration, the moving handle or the fourth rod slides to the edge, at this time, the chalk in the chalk mounting port has drawn half of the image, and the other half of the image is drawn by the same method.

7. The physical graphing tool for demonstrating the first definition of a parabola of claim 6, wherein, Before drawing the other half of the image, the fourth rod and the moving handle need to be moved together from the other end of the second rod and the third rod to the initial state.

8. The physical graphing tool of the demonstration of the first definition of a parabola according to claim 1, wherein, The base is two strong magnetic bases which are installed at the two ends of the first rod.

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