CN2189062Y - Scaled flexible ruler type instrument for drawing ellipses - Google Patents

Abstract

The utility model relates to an ellipsograph with a flexible ruler with small hole scales. The ellipsograph is suitable for being used for drawing ellipses by general engineers or students. On the basis of a compass, a fixed leg of the compass is additionally provided with a folding joint, and one end of a steel needle used by the compass with a shoulder is additionally provided with a small shaft, a flexible ruler with small hole scales is matched to be used, and an ellipse whose size is required can be drawn. The utility model can also be matched with a compass fitting for drawing a circle and equally dividing a line segment. One ellipsograph has a plurality of purposes.

Description

Scaled flexible ruler type instrument for drawing ellipses

The utility model relates to a kind of modified ellipsograph, particularly a kind of a kind of ellipsograph with band aperture scale tape formula.

What the similar utility model of recognizing by the retrieval technique data that utility model is done with regard to me was related is to make aperture respectively at two draw point points of compasses, and adapted single line rope is realized the picture ellipse again.Like this, to in drawing ellipse, the ellipse that concrete dimensional requirement arranged just can not be rapidly, decide accurately, need slowly careful debugging, and cotton rope is when signing in place, transverse summit, the restriction that cotton rope is subjected to draw point reduces major axis dimension, otherwise the rule body that reverses again in the time of need painting a semiellipse is drawn second half ellipse again, moreover cotton rope is through in the hole at draw point tip and can not directly contacts with paper, makes troubles often for the picture person, increased the chance that produces error.

The utility model is that other adds a tape that has the aperture scale and realizes the ellipse that draws accurately, easily on the basis of improving compasses.It compares the advantage that following several respects are arranged with the existing public technology of similar utility model:

1, owing to have the aperture scale on the tape, the draw point of ellipsograph can directly insert in the desired scale hole according to the dimensional requirement of ellipse, makes picture accurately, conveniently.

2, when drawing, because tape and paper keep in touch, avoided the defective that contacts with pencil as cotton rope in the disclosed similar utility model aloft, reduced the picture error.

3, because the scale on the tape can be accurate to 1 millimeter, so the dimensional accuracy of the ellipse that draws can be controlled within 0.5 millimeter.

4, because draw point can freely rotate in the scale hole of tape, so when the picture ellipse, can divide two to finish whole ellipse figure (tape can be crossed) and the rule body that need not reverse has reduced the picture error between two draw points.

5, this ellipsograph is easy to use, and the compasses accessory that can also change the outfit uses.

Be illustrated below with reference to accompanying drawing.

Fig. 1 is the structural representation of this ellipsograph.

Fig. 2 is the perspective view of draw point among Fig. 1 ［ 4 ］.

Fig. 3 is the figure that fractures that tape among Fig. 1 ［ 5 ］ amplifies.

Fig. 4 is oval geometric properties figure.

With reference to Fig. 1, structure of the present utility model is to realize like this, rule bodies ［ 1 ］ are to add a folding joint ［ 6 ］ on the Convenient table of compasses, and have an end of shoulder bearing-surface to add a bit of axle as Fig. 2 to the fixing of compasses with draw point, are used as Fig. 3 with a tape ［ 5 ］ that has the aperture scale.It is made up of rule body ［ 1 ］, elbow joint ［ 2 ］, draw point pin ［ 3 ］, draw point ［ 4 ］, tape ［ 5 ］ and folding joint ［ 6 ］.

Mapping principle can be according to the definition of ellipse, oval geometric properties such as Fig. 4 and C=a-b as can be known: as know wherein any two conditions, and this ellipse all can draw.

Size, the accent elbow joint ［ 2 ］ according to focal length is vertical to two draw points ［ 3 ］ and paper maintenance with folding joint ［ 6 ］ earlier during use, and make two draw points point keep concordant, the end that the shoulder axle is arranged that to determine two draw points ［ 3 ］ of focal length size then insert to be determined vertically to penetrate cardboard in the scale hole of tape ［ 5 ］ of good long and short shaft size, tighten the mobile half cycle of tape ［ 5 ］ semiellipse of drawing with tip of a pencil, then tape ［ 5 ］ was dialled second half ellipse of picture between two draw points ［ 4 ］, need not reverse and advise body ［ 1 ］, notice that pencil should keep vertical with paper.

Because tape ［ 5 ］ scale pitch of holes is 2 millimeters,, can utilize negative 1 adjustment hole at tape ［ 5 ］ top to regulate if when needing the odd number size.

Claims (3)

1, a kind of scale tape formula ellipsograph device, this device connects rule bodies [1] and draw point pin [3] by elbow joint [2], folding joint [6], it is characterized in that an end of draw point [4] can directly insert in the required scale hole of tape [5].

2,, it is characterized in that an end of draw point ［ 4 ］ adds a bit of axle by the ellipsograph device of claim 1 regulation.

3, by the ellipsograph device of claim 1 regulation, the scale pitch of holes that it is characterized in that tape ［ 5 ］ is 2 millimeters, and there is individual negative 1 adjustment hole at the top of tape.

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