CN201405634Y

CN201405634Y - Ellipsograph

Info

Publication number: CN201405634Y
Application number: CN2009200207340U
Authority: CN
Inventors: 张楠
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-04-09
Filing date: 2009-04-09
Publication date: 2010-02-17
Anticipated expiration: 2019-04-09

Abstract

The utility model discloses an ellipsograph, which comprises an outer plate and an inner plate. The outer plate is provided with an inner gear hole, the inner plate is an outer gear plate, the maximumdiameter of the inner gear hole on the outer plate is twice the maximum diameter of the inner plate, the number of the teeth on the inner gear hole of the outer plate is twice the number of the teethon the outer plate, and the inner plate is provided with a plurality of pen holes. Since the ellipsograph consists of two plates, the structure is very simple. When the ellipsograph is used for drawing an ellipse, only the inner plate is required to be rotated for a circle in the outer plate, and then the complete ellipse can be drawn, thereby simplifying the operation. Moreover, the utility model has high accuracy in the drawing of the ellipse.

Description

A kind of ellipsograph

Technical field

The utility model relates to a kind of study article, particularly a kind of ellipsograph.

Background technology

In last how much class hours; teacher regular meeting holds a rope and draws oval; need ask student's help when drawing ellipse; the student pins the two ends of rope; teacher is choosing rope motion one circle with chalk then; because move easily at the two ends of rope, what this kind method was drawn is oval inaccurate, and end positions is difficult for drawing next.

Summary of the invention

The technical problems to be solved in the utility model is: a kind of simple in structure, easy and simple to handle, ellipsograph that accuracy is high is provided.

In order to solve the problems of the technologies described above, the utility model comprises outside plate and inner panel, one internal gear hole is arranged in the outside plate, inner panel is an external tooth wheel plate, internal gear hole maximum diameter on the outside plate is 2 times of inner panel maximum diameter, the number of teeth in the internal gear hole of outside plate is 2 times of the number of teeth of outside plate, and inner panel is provided with a plurality of holes.

The beneficial effects of the utility model are: the utility model is made up of the two boards body, and structure is very simple, draws when oval, only needs inner panel at the outside plate inward turning complete ellipse that can draw that turns around, operate very easy, and the accuracy height of the ellipse that draws.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Wherein: 1, outside plate, 2, inner panel, 3, a hole.

The specific embodiment

A kind of ellipsograph as shown in Figure 1, it comprises outside plate 1 and inner panel 2, outside plate 1 be a square plate, one internal gear hole is arranged in the outside plate 1, inner panel 2 is an external tooth wheel plate, internal gear hole maximum diameter on the outside plate 1 is 2 times of inner panel maximum diameter, and the number of teeth in the internal gear hole of outside plate 1 is 2 times of the number of teeth of outside plate 1, and inner panel 2 is provided with a plurality of holes 3.Hole 3 is oval minor axis apart from inner panel 2 edge minimum distances, and a hole 3 is a long axis of ellipse apart from inner panel 2 edge maximum distances.

Using method: outside plate 1 and inner panel 2 are meshed.According to long axis of ellipse and the selected hole 3 of minor axis, pencil is inserted in the hole 3, inner panel 2 is rotated, up to the starting point that turns on the internal gear hole around the internal gear hole of outside plate 1.The track that pencil drew is required ellipse.

Claims

1. ellipsograph, it is characterized in that: comprise outside plate (1) and inner panel (2), one internal gear hole is arranged in the outside plate (1), inner panel (2) is an external tooth wheel plate, internal gear hole maximum diameter on the outside plate (1) is 2 times of inner panel maximum diameter, the number of teeth in the internal gear hole of outside plate (1) is 2 times of the number of teeth of outside plate (1), and inner panel (2) is provided with a plurality of holes (3).