CN201245011Y

CN201245011Y - Magnetic elliptic compasses

Info

Publication number: CN201245011Y
Application number: CNU2008201267984U
Authority: CN
Inventors: 曹凯
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-06-30
Filing date: 2008-06-30
Publication date: 2009-05-27
Anticipated expiration: 2018-06-30

Abstract

The utility model relates to an ellipsograph with magnetism, which comprises a ruler with a hollow groove, two magnetic slide focus components and a winding. The magnetic slide focus component is installed in the hollow groove of the ruler and can slide and be fixed, thereby regulating the focal length of an ellipse; the ellipsograph can be attracted on a white board or a magnetic blackboard by the suction force of a magnet at the bottom part; the winding is a closed thread rope and sleeved on the screw rods of the two slide focus components. When the ellipsograph is used for drawing an ellipse, a pen is sleeved in the winding, the winding is tightened to rotate around the two focuses, and then the ellipse can be drawn.

Description

A kind of magnetic ellipsograph

Technical field

The utility model relates to a kind of drawing tools, particularly a kind of ellipsograph.

Background technology

The patent of present ellipsograph has much, can be divided into 3 classes: the first kind is the definition (is that the track of point of definite value is for oval apart from sum to two fixed points) according to ellipse, by the zoom point, with winding the line the picture ellipse; Second class is the character according to ellipse, and the cross guide rail of long axis of ellipse, minor axis is set, and slides on guide rail with slide bar and comes the picture ellipse; The 3rd class is the character according to conic section, comes the picture ellipse with the disk of compasses and inclination is tangent.

Above-mentioned three kinds of ellipsographs cut both ways.Second kind of Ellipsograph structure more complicated when particularly drawing on the blackboard of classroom, used inconvenient.The third ellipsograph is not suitable for drawing on the hard material, because the tip of compasses is difficult on the hard material locatees.First kind of ellipsograph principle is simple, but the design of present patent also is less compliant on the blackboard of classroom and draws because the material of fixed-focus, have as compasses, be the focus location with the tip, have plenty of with the plastics sucker and locate.Plastics sucker location deficiency also arranged: on blackboard, be difficult for sucking, because blackboard itself and rough has remaining chalk to consider to be worth doing; Also should not operate for blank, because blank is smooth, quality is softer, sucker firmly absorption makes the blank distortion easily.In addition, there is aging problem in the plastics sucker, has also brought inconvenience to use.

Summary of the invention

The technical problem that solves

Ellipsograph of the present utility model wishes to solve ellipsograph convenient problem of drawing on blackboard.

Technical scheme

The utility model addresses the above problem in order to following scheme.

Ellipsograph of the present utility model locatees for the focus of ellipse with magnet.Present blackboard mostly is green plate, and the back is an iron plate, so magnetic focus assembly can be inhaled in the above easily.

This ellipsograph is made of ruler (1), two magnetic slip focus assemblies (2), coiling (3) three parts of band dead slot: slip focus assembly is made up of disk magnet, lead screw, pad, nut with holes, lead screw is passed from the hole of disk magnet, pass the dead slot of above-mentioned ruler again, twist with pad and nut and to be buckled on the ruler, by the tightness of adjusting nut, two slip focus assemblies can be slided or fixing on above-mentioned dead slot ruler; Described coiling is closed cotton rope, is enclosed within on the lead screw of above-mentioned two slip focus assemblies.

Draw when oval, regulate the position of two slip focus assemblies, make their distance equal the focal length of the ellipse of required picture; For magnet board or blank, ellipsograph is inhaled in the above by magnetic, to nonmagnetic substance, ellipsograph by drawing in the above; Coiling is enclosed within on two slip focus assemblies, and the pen cap is strained coiling in coiling, rotates around two focuses, and the track of pen is ellipse; By the length of regulating coiling, the distance of focus, the ellipse of different sizes, eccentricity can draw;

Can also the draw circle of any radius of this ellipsograph.Only need remove a slip focus assembly, with (c) described method, draw coiling to rotate around a focus with pen and get final product, by regulating the length of coiling, the circle of different sizes can draw.

Beneficial effect

This ellipsograph adopts magnetic focus assembly, has solved the problem that focus is located on blackboard when drawing ellipse, is applicable to the green plate of blank and school, can demonstrate picture easily.

Description of drawings

Below in conjunction with accompanying drawing the utility model is elaborated.Referring to accompanying drawing

Fig. 1 is a kind of structural representation of magnetic ellipsograph.

The specific embodiment (one)

Referring to Fig. 1, a kind of magnetic ellipsograph.

The 1st, the wooden rule of band dead slot, the long 25cm of chi, wide 6cm, thick 0.6cm.Leave the groove of the wide 0.5cm of long 20cm in the middle of the chi.

The 2nd, magnetic slip focus assembly is made up of disk magnet, lead screw, pad, nut with holes.Disk magnet diameter 2.5cm, thick 0.1cm, Circularhole diameter 0.4cm, the long 2cm of screw, bar passes from the hole of disk magnet, passes the dead slot of above-mentioned ruler again, twist with pad and nut and to be buckled on the ruler, by the tightness of adjusting nut, two slip focus assemblies can slide in groove.

The 3rd, the nylon wire of closed coiling is fastened on the slip focus in left side, is enclosed within on the slip focus on right side.

Draw when oval, regulate the position of two magnetic slip focus assemblies, make their distance equal the focal length of the ellipse of required picture; Then ellipsograph is inhaled on green plate, chalk sleeve begins to haul clockwise coiling from the left side and rotates a week around two focuses in closed line, and ellipse can draw.

By the length of regulating coiling, the distance of focus, the ellipse of different sizes, eccentricity can draw;

Draw bowlder, only need remove a slip focus assembly, use said method, draw coiling to rotate with pen and get final product in a week around a focus assembly.By regulating the length of coiling, the circle of different sizes can draw.

Claims

1. a magnetic ellipsograph comprises ruler (1), two magnetic slip focus assemblies (2), coiling (3) the three parts composition of being with dead slot, it is characterized in that:

(a) described magnetic slip focus assembly is made up of disk magnet, lead screw, pad, nut with holes, lead screw is passed from the hole of disk magnet, pass the dead slot of above-mentioned ruler again, twist with pad and nut and to be buckled on the ruler, by the tightness of adjusting nut, two slip focus assemblies can be slided or fixing on above-mentioned dead slot ruler;

(b) described coiling is closed cotton rope, is enclosed within on the lead screw of above-mentioned two slip focus assemblies.

2. ellipsograph according to claim 1 is characterized in that described coiling, can be fixed therein on the lead screw of a slip focus assembly.

3. ellipsograph according to claim 1 is characterized in that described disk magnet diameter at 1～2.5 centimetre, and the internal diameter of magnet circular hole is at 2～5 millimeters.