CN201235685Y - Two-purpose elliptic, elliptical compass compasses - Google Patents

Abstract

The utility model relates to a pair of circle and ellipse double-purpose compasses belonging to a drawing tool which not only can draw a circle, but also can draw an ellipse. The compasses mainly comprise common compasses and an elliptical rotating arm, the upper ends of two feet of the compasses are tightly meshed by gears with the same size and are fixed on a metal block, one compasses foot is formed by two telescopic parts, the top end of the metal block is provided with a screw which is used for connecting the common compasses and the elliptical rotating arm, the thickness of a spring steel piece of the elliptical rotating arm is 1.5 mm, the upper end of the elliptical rotating arm is fixed on the center of the metal block of a rotating arm sleeve barrel, two strips have the same length, the diameter of each steel strip is 2 mm, the inner diameter of a small sleeve barrel is greater than the outer diameter of the steel strip, and five connecting points (an H point, a G point, an F point, an E point and a D point) of the circle and ellipse double-purpose compasses not only can be firmly connected, but also can flexibly rotate.

Description

Round, ellipse dual purpose compass

Affiliated technical field

The utility model is a kind of drawing instrument, can draw circle with it, also can draw ellipse, and it is very convenient especially to draw ellipse, compares with the method for traditional picture ellipse, and is time saving and energy saving, one-shot forming.It can be widely used in the teaching of school.

Background technology

At present, the method for drawing ellipse in teaching is the method with oval template or employing described point, in this way, time-consuming, effort, very inconvenient.And the required ellipse of ellipse that draws and reality has certain gap.

Summary of the invention

For speed and the accuracy that improves the picture ellipse, the utility model provides a kind of circle, ellipse dual purpose compass, and it mainly is made up of common compasses and ELLIPTIC REVOLUTION arm two parts.This dual purpose compass can be drawn circle, and it is oval arbitrarily also to draw.

The technical scheme that the utility model technical solution problem is adopted is: common compasses are reequiped slightly, the top of two rule of compasses pin, also be interlocked mutually with two equirotal gears are fixing, its objective is when drawing ellipse, make A, B 2 points on two pin of compasses, be in all the time on two oval focuses.Set up an ELLIPTIC REVOLUTION arm in addition again.The ELLIPTIC REVOLUTION arm is by two thicknesses, steel bar that length is the same, spring steel plate, and nib and nib sleeve are formed.Nib sleeve the inside is provided with a spring.The turning arm top is that a metal small sleeve and metal derby are formed, and the center of metal derby is provided with a screw, with its fixing spring steel disc, after the method shown in the photograph figure fixes during use, just can draw oval.

The beneficial effects of the utility model are: with a kind of instrument of combination, both can draw circle, and also can draw ellipse.It simple in structure, it is also convenient to use.

Description of drawings

Accompanying drawing to utility model is described further below:

Accompanying drawing is the entity schematic diagram of utility model circle, ellipse dual purpose compass.

Among the figure 1, common compasses, 2, pinion, 3, metal derby, 4, nut, 5, steel bar, 6, the metal small sleeve, 7, spring steel plate, 8, nib, 9, spring, 10, the nib small sleeve, 11, the turning arm sleeve, 12, the elliptical orbit line.

The specific embodiment

The utility model mainly is made of common compasses and ELLIPTIC REVOLUTION arm two parts, and a rule pin of common compasses is made up of the two parts that can stretch, and the upper end of two rule pin is pinions of two tight interlocks, is fixed on the metal derby.The upper end is a screw, connects common compasses and ELLIPTIC REVOLUTION arm with it.HK is thick 1.5 millimeters spring steel plate, and FD, GE are 2 millimeters the same steel bars of length of diameter.I, J are two small sleeves, are fixed on the lower end of spring steel plate, and are enclosed within respectively on two steel bars, and A, B, C are three grooves, and dotted line is the elliptical orbit line among the figure, and ON is a nib, and the nib top is a compression spring.

In the drawings, the top of compasses parts (1) welding two equirotal pinions (2) also are fixed on the metal derby (3), require pinion (2) to rotate flexibly, fix a cap nut (4) above the metal derby (3).One end of steel bar (5) is fixed on G, F 2 points of the square metal piece of turning arm sleeve (11), 2 both sides of G, F at the square metal piece, the other end of steel bar (5) is fixed on E, D 2 points of nib sleeve (10), 2 both sides of E, D at the nib sleeve, and GF=ED, 4 some G, F, E, the D at steel bar (5) two ends can not fix extremely, require to rotate flexibly.The upper end of spring steel plate (7) is fixed on the central point H place of the square metal piece of turning arm sleeve (11) with screw, requirement can be fixed extremely, can rotate flexibly again, the other end of spring steel plate (7) is connected with metal small sleeve (6), and metal small sleeve (6) is enclosed within on two steel bars (5).Nib (8) is built in nib sleeve (10) the inside, and nib (8) upper end trip should be slightly less than the internal diameter of nib sleeve (10), and requires to slide up and down freely, and spring (9) is built in the upper end of nib sleeve the inside, and elasticity requires moderate.Compasses (a 1) rule pin wherein is made up of the two parts that can stretch, and two parts connect with screw, and the top part of rule pin is made nut, and bottom is screw (long 1.5 centimetres).

Draw oval concrete grammar: launch two rule pin (1), and will advise the A of pin (1), two focuses of 2 drawn ellipses of perpendicular alignmnet of B, the N point of nib (8) places on the end points of transverse, put the elliptical orbit line, and fix the length of trajectory (12), the turning arm sleeve is revolved three-sixth turn, and required ellipse promptly is drawn as.When drawing ellipse, requirement is round, ellipse dual purpose compass is vertical with elliptic plane all the time.Draw bowlder, draw two rule pin (1) in, and wherein a rule pin shortens, and removes elliptical orbit line (12), has determined radius of a circle, and the H point of turning arm sleeve (11) metal derby is tightened.

Claims (1)

1. Circle, ellipse dual purpose compass mainly is made of common compasses and ELLIPTIC REVOLUTION arm two parts, it is characterized in that: the upper end of two rule of compasses pin closely is interlocked with equirotal two gears, and be fixed on the metal derby, lower end (A at the rule pin, B) open a groove, wherein a rule pin is made up of the two parts that can stretch, two parts connect with screw, screw is made in the top, the silk nail is made by bottom, long 1.5 centimetres of silk nail, a screw is installed on the top of metal derby, connect common compasses and ELLIPTIC REVOLUTION arm with it, thick 1.5 millimeters of spring steel plate in the ELLIPTIC REVOLUTION arm, the upper end of steel disc is fixed on the central point of turning arm sleeve metal derby part with screw, the plane of spring steel plate should be towards the tracing point of ellipse, two steel bar length are the same, 2 millimeters of diameters, be connected to two angle (G up and down of the metal derby outside of turning arm sleeve, F) and the nib sleeve in the middle of (D, E) 4 points, on the metal derby in 2 distance and the nib sleeve 2 distance equate that the metal small sleeve is fixed on the lower end of spring steel plate and is enclosed within on two steel bars.

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