CN204322845U - A kind of conic section drawing tool - Google Patents

Abstract

The utility model discloses a conic curve drawing tool, which comprises a ruler body and a moving shaft sleeve. The middle section of the ruler body has two thin rods arranged vertically. The thin rods are inserted into the moving shaft sleeves. To move, there are two movable fixed seats inside the ruler body, and two movable fixed seats are also arranged in the moving sleeve, and the two ends of the string are fixed on the fixed seats, and pass through the ears of the chalk holder. The conic curve drawing tool of the utility model can allow students to feel the characteristics of the conic curve more intuitively, make the drawn figure more standard, and facilitate the drawing of the teacher, and can quickly make a standard curve figure. The structure is simple, easy to process, practical and convenient.

Description

A conic curve drawing tool

technical field

The utility model relates to the field of educational tools, in particular to a conic curve drawing tool.

Background technique

The common conic curve drawing tools on the market are generally complex in structure and complicated in operation. It is difficult for one person to complete the drawing and cannot intuitively reflect the drawing principle. The conic curve drawing tool needs to meet the drawing requirements of three kinds of lines at the same time; when drawing, it needs to be able to adjust the drawing size according to its own data; only one focus of parabola is fixed; hyperbola and parabola can be extended infinitely; The sum of the distances of the focal points does not change.

Utility model content

In order to solve the above-mentioned technical problems existing in the prior art, the utility model provides a conic curve drawing tool, which includes a ruler body and a moving sleeve. The middle section of the ruler body has two thin rods arranged vertically, and the thin rods are inserted Into the moving bushing, the moving bushing moves along the thin rod, there are two movable fixing seats inside the ruler body, and there are also two movable fixing seats inside the moving bushing, and the two ends of the string are fixed on the fixed seat and through the tie ears of the chalk holder.

Further, the moving sleeve is manually fixed on a certain position of the thin rod by a screw.

Further, the chalk is fixed on the chalk holder.

The conic curve drawing tool of the utility model can allow students to feel the characteristics of the conic curve more intuitively, makes the drawn figure more standard, and facilitates the drawing of the teacher, and can make a standard curve figure very quickly. The structure is simple, easy to process, practical and convenient.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the conic curve drawing tool of the present utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1, the conic curve drawing tool of the present utility model comprises a ruler body 1 and a moving bushing 2, the middle section of the ruler body 1 has two thin rods 3 vertically arranged, and the thin rods 3 are inserted into the moving bushing 2 , the moving bushing 2 can move along the thin rod 3, the inside of the ruler body 1 is provided with two movable fixing seats 4, the moving bushing 2 is also provided with two movable fixing seats 4, and the two ends of the string 5 It is fixed on the fixed seat 4 and passes through the tie ear 8 of the chalk holder 6 . The moving axle sleeve 2 is manually fixed on a certain position of the thin rod 3 by a screw 7 . Chalk is fixed on the chalk holder 6.

When the conic curve drawing tool of the utility model is used, the string 5 has flexibility, which can meet the requirement that the distance from the point on the curve to the focal point is constantly changed during drawing; when drawing a parabola, the insertion degree of the thin rod 3 can be changed to control The focal length, the screw 7 can play a fixed role; the size is marked on the ruler body 1, so as to adjust the focal length by drawing a conic curve; the fixed seat 4 is used to fix the focus and one end of the fixed rope; the chalk holder 6 is used to fix the chalk, and the string 5 Pass through the lug 8 as a point on the conic curve; the fixed seat 4 is set on the straight line where the focus is, and it is also a movable rod for the focus.

Claims (3)

1. A conic curve drawing tool, comprising a ruler body (1) and a moving bushing (2), characterized in that: the middle section of the ruler body (1) has two thin rods (3) arranged vertically, the thin rods (3) Insert it into the moving bushing (2), and the moving bushing (2) moves along the thin rod (3). There are two movable fixing seats (4) inside the ruler body (1), and the moving bushing ( 2) There are also two removable fixed seats (4) inside, and the two ends of the string (5) are fixed on the fixed seats (4), and pass through the tie ears (8) of the chalk holder (6). 2. The conic curve drawing tool according to claim 1, characterized in that: the moving bushing (2) is manually fixed on a certain position of the thin rod (3) by a screw (7). 3. The conic curve drawing tool according to claim 1, characterized in that the chalk is fixed on the chalk holder (6).