CN85200966U - Graduated curves - Google Patents

Abstract

The utility model provides a graduation curve board for drawing, which is characterized in that dimension graduations are on the curved board. When symmetrical curves are drawn, the same curves can be achieved, and the length of the curves are known. The combined curved board is numbered by digits, which is convenient to select.

Description

The calibration curve plate

The present invention relates to mark size scale and label on a kind of drawing curve ruler.

Existing drawing curve ruler when drawing symmetrical curve, is that section on the curve ruler because can't correctly know article one curve, can only do some estimations so draw the second symmetrical curve, and the symmetrical curve that draws like this is just approximate, is not the same.Use combined type curve ruler (several curve rulers are formed a pair), because unlabelled often causes and selects or reuse comparatively difficulty of that curve ruler for use.

In order to address this problem, common way is when drawing article one curve, marks on curve ruler with pen, draws the second symmetrical curve again, and then mark is wiped, so very trouble.Consulting technical data does not have this type of yet, and the sign of size scale is arranged.

The objective of the invention is to provide a kind of calibration curve plate, it draws same curve easily, is easy to select for use curve ruler.

The content of invention: with the curved edge on drawing curve ruler two sides chamfering all, again at a designated size scale.With every curve ruler numeral number of combined type.

Calibration curve plate of the present invention can reach identical so draw symmetrical curve according to sizing; Can know length of a curve; Combined type curve ruler numeral number facilitates and selects for use.

The concrete structure of invention is provided by its accompanying drawing.

The compound calibration curve plate of Fig. 1

One (numbering B) in Fig. 2 combined type calibration curve plate

Detail and operating position below in conjunction with description of drawings the present invention proposition.

Size scale on the curve ruler adopts centimetre expression, and as zero point, its size stretches to two aspects with the common ground of two curves, if the inside and outside curve distance of curve ruler is more approaching, goes out size at the external curve subscript.The whole chamferings of the curved edge of curve ruler positive and negative (0.2～0.3 millimeter * miter angle).On knockdown every curve ruler, with A, B, numeral numbers such as C, D.

When using combined type calibration curve plate to draw symmetrical curve, select the curve ruler of a block number earlier for use, remember the starting point of curve and the cms of terminal point when drawing article one curve, use the reverse side of calibration curve plate then, with above cms line segment, draw the second curve, these two symmetrical curves are identical.

Claims (2)

1, the calibration curve plate is a kind of common drawing curve ruler, it is characterized in that:

(1) marks size scale on the drawing curve ruler;

(2) the positive and negative edge of drawing curve ruler chamfering all;

(3) knockdown every curve ruler numeral number.

2, structure according to claim 1 is characterized in that common ground with two curves as zero point, and its size stretches to both direction.