CN87206667U

CN87206667U - Ellipsograph

Info

Publication number: CN87206667U
Application number: CN 87206667
Authority: CN
Inventors: 周国平
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-04-18
Filing date: 1987-04-18
Publication date: 1988-03-02

Abstract

The utility model relates to an ellipsograph, and belongs to a drawing instrument. The ellipsograph is designed according to the definition of an ellipse. The ellipsograph only changes and increases simple accessories of an elastic drawing leg, a positioning accessorial leg, a long ellipsograph handle shaft, a fixing needle and a fixing needle pulley, and can draw the standard traces of any ellipse according to known conditions. When the accessories are discharged, the ellipsograph can recover to be a compass. If the positioning leg is reserve, the ellipsograph can be used as a divider. Therefore, the utility model has the advantages of simple structure, easy fabrication and low cost, and the ellipsograph can achieve the purpose that the ellipsograph is multipurpose. The ellipsograph can be applied to teaching and production; in the teaching, the ellipsograph is favorable for students to understand the trace property of ellipses.

Description

Ellipsograph

The utility model is about a kind of ellipsograph, belongs to drawing instrument.

Existing ellipsograph all is that rule are painted in the special use of fixing generally.Also can retouch out the multiple curve that meets known conditions though some paints rule, its structure is all comparatively complicated, involves great expense, and rotates freely the compasses nor can resemble, and deepens person's handwriting and equipped pen repeatedly.

The purpose of this utility model is: seek a kind of easy device that is assigned on the common compasses, according to known conditions, can draw the standard trajectory of arbitrary ellipse, can make the usefulness of compasses, divider again, reach the many usefulness of rule.

The utility model is according to " two fixed points be that the track of moving some M of a constant is oval apart from sum " this oval definition, now there is the stem of compasses to change system into the calipers arbor, other establish elasticity paint pin and the location attached pin each one (elasticity is painted pin can directly use flexible material, also can between itself and sleeve pipe, add elastic component in addition, reaching adjustable purpose gets final product), locate on attached pin and the former rule pin, be equipped with respectively and decide pin and decide the pin pulley, by the stem axle elasticity is painted pin and be connected with compasses.Elasticity is painted reel is housed on the pin, and the variable fixed length line on the reel is painted to extract out to be enclosed within the through wires hole of the elasticity trim plate lower end on the pin from elasticity and decided on the pin pulley.

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

Below in conjunction with accompanying drawing the utility model is described in detail: stem axle 1 is housed on the Connection Block 20, and there is sleeve pipe 2 on the top that elasticity is painted pin 3, and sleeve pipe 2 is enclosed within on the stem axle 1, and slides up and down only and do 360 around it and spend positive and negative rotation.The other end that elasticity is painted pin 3 is provided with reel 4, paints a movable joint 5, paints pen 9 and is inserted in the ditch core 7 of painting a movable joint 5.The lateral surface of painting a movable joint 5 is equipped with elasticity trim plate 8, and micrometer adjusting screw 10 is arranged on the elasticity trim plate 8, and the lower end is drilled with through wires hole 11, and variable fixed length line 14 is drawn by being enclosed within two behind the through wires hole 11 by reel 4 and decided on the pin pulley 13,16.Two decide

pin pulley

13,16 is enclosed within respectively and decides on the

12,15, and can rotate around deciding pin 12,15.Decide pin 15 and link to each other, locate attached pin 17 and be contained on the rule pin 19 with the attached pin 17 in location.

During use, gently paint a line segment M by required major axis dimension and figure direction ₁M ₂=major axis is found out line segment mid point O, by F ₁=F ₂=

Calculate bifocal F ₁, F ₂The position, will decide

12,15 and be individually fixed in focal point F ₁, F ₂(attention will be decided

pin pulley

13,16 and transfer to substantially parallel with paper) at this moment can regulate reel 4 and micrometer adjusting screw 10 on the point, makes the nib of painting pen 9 drop on the M of major axis ₁Or M ₂On the point, elasticity is painted pin 3 rotate a circle, can draw the standard trajectory of required ellipse around stem axle 1.Be used for tracing in this way, change pen into as long as then will paint pen.

The utility model only will have compasses now and change, sets the attached pin 17 in position, stem axle 1, decide

12,15 and elasticity paint pin 3 and reach and decide can use behind pin pulley 13, the 16 simple and easy annexes. Therefore, have simple in structure, easy manufacturing, the with low cost and multiplex advantage of rule. When laying down above-mentioned annex, change the original part of compasses and just be reduced into compasses; As keep the attached pin 17 in location, can be used as divider. In addition, because this ellipsograph is designed according to the definition of ellipse, so the track of painting is oval real trace, is applied in and will help the student to the understanding of elliptical orbit character in the teaching.

Claims

1, a kind of ellipsograph, by Connection Block 20, rule pin 18,19 and elasticity paint pin 3 and form, it is characterized in that: the flexible pin 3 of painting, stem axle 1 is arranged on the Connection Block 20, the sleeve pipe 2 that elasticity is painted pin 3 tops is enclosed within on the stem axle 1, decide pin 12, be with respectively on 15 and decide pin pulley 13,16, decide pin pulley 13, be wound with variable fixed length line 14 on 16, elasticity is painted pin, the other end that elasticity is painted pin 3 is equipped with reel 4, paints pen 9 and is inserted in the ditch core 7 of painting an active section 5, and the lateral surface 6 of painting a movable joint 5 is equipped with elasticity trim plate 8, micrometer adjusting screw 10 is arranged on the elasticity trim plate 8, and the lower end of elasticity trim plate 8 is drilled with through wires hole 11.

2, a kind of ellipsograph according to claim 1 is characterized in that variable fixed length line 14 passes perforation 11 backs on reel 4.

3, a kind of ellipsograph according to claim 1 is characterized in that deciding pin 15 and is connected by the attached pin 17 in location with rule pin 19.