CN111391547A

CN111391547A - Scale tool and using method thereof

Info

Publication number: CN111391547A
Application number: CN202010401949.8A
Authority: CN
Inventors: 秦薇
Original assignee: Shanghai Danzhu Construction Engineering Technology Development Co ltd
Current assignee: Shanghai Danzhu Construction Engineering Technology Development Co ltd
Priority date: 2020-05-14
Filing date: 2020-05-14
Publication date: 2020-07-10

Abstract

The invention provides a scale tool and a using method thereof, which can conveniently draw regular polygons combined by various side lengths and angles, is not only suitable for drawing graphs, but also can be applied to lofting of engineering fields, the scale tool is formed by splicing a component I (1) and a component II (5), the component I (1) and the component II (5) are combined by placing a screw fixing device (7) capable of being screwed through a reserved circular hole (2), length scale marks (4) are printed on each component in advance, preferably, if a transparent material is used, a protractor (3) can be printed on the component I (1) in advance, and mark lines (6) are printed on the component II (5).

Description

Scale tool and using method thereof

Technical Field

The invention relates to a scale tool and a use method thereof.

Background

The existing method for drawing regular polygons generally determines each angular point one by one through a protractor and a ruler and draws the regular polygons in parallel, angles and lengths need to be measured repeatedly in the continuous drawing process, the operation is complex, the accumulated error is large, the drawing on a small-sized drawing is fashionable and acceptable, if the drawing is carried out on a large scale in engineering, the operation of repeatedly measuring the angles and the lengths is difficult, a more complex instrument is generally needed during field lofting, and the consequence of the accumulated error is more serious.

The invention provides a ruler tool, which can conveniently draw a pre-designed regular polygon with specified angle and side length, only needs to measure the angle and the length once, is simple and convenient to operate, is not easy to generate accumulated errors, and can be suitable for drawing small-sized patterns or large-sized field lofting according to different lengths of rulers.

Disclosure of Invention

The invention provides a scale tool which can be used for conveniently drawing regular polygons formed by combining various side lengths and angles, is suitable for drawing graphs and can also be applied to lofting of engineering fields.

The specific technical scheme is as follows:

A. the scale is formed by splicing a component I (1) and a component II (5), and the two are combined by placing a screw fixing device (7) which can be screwed tightly in a reserved round hole (2);

B. a round hole (2) is reserved on the component I (1), and the circle center is centered in the width direction of the component I (1); length scale marks (4) are printed in advance along the length direction;

preferably, if the transparent material is adopted, the protractor (3) can be printed around the round hole in advance, the center of the protractor (3) is aligned with the circle center of the round hole (2), and a 0/180 degree scale mark of the protractor (3) penetrates through the circle center of the round hole (2) and is parallel to the length direction of the assembly I (1);

C. a circular hole (2) is reserved on the component II (5), the circle center is centered in the width direction of the component II (4), and the diameter of the circular hole is the same as that of the circular hole (2) reserved on the component I (1); length scale marks (4) are printed in advance along the length direction;

preferably, if the transparent material is adopted, the identification line (6) can be printed near the circular hole in advance, and the direction of the identification line is parallel to the length direction of the component II (5) and penetrates through the circle center of the reserved circular hole (2).

The invention also discloses a use method of the scale, which comprises the following main steps:

firstly, as shown in fig. 3, after the component I (1) and the component II (5) are combined through the screw fixing device (7) which can be screwed, the components are rotated, the included angle between the components is enabled to reach the inner included angle α of the designed regular polygon (12) by means of a common protractor, and the screw fixing device (7) is screwed;

preferably, if the assembly I (1) and the assembly II (5) are made of transparent materials, the protractor (3) and the identification line (6) can be respectively printed on the assembly I (1) and the assembly II (5), the reading of the identification line (6) on the protractor (3) is the included angle of the two assemblies, and the screw fixing device (7) can be screwed when the design value α is reached;

secondly, as shown in fig. 3, reading the same value on the two components according to the side length L of the designed regular polygon (12), drawing a mark point a (8), a mark point B (9) and a mark point C (10), and drawing connecting lines AB and BC thereof;

thirdly, picking up the scale, rotating the scale, aligning an inner corner point of the scale with a mark point C (10) as shown in FIG. 4, aligning the side edge of the scale of the component I (1) with a connecting line BC (namely 9 and 10 connecting lines) drawn in the previous step, drawing a mark point D (11) on the scale with the length of L on the component II (5), and drawing a connecting line CD between the mark point D and the mark point C (10);

and fourthly, repeating the third step, aligning the inner corner point of the ruler with the mark point D (11), aligning the side edge of the scale of the component I (1) with the connecting line CD (namely 10 and 11 connecting lines) drawn in the previous step, drawing the next mark point at the scale with the length of L on the component II (5), and drawing in sequence to finish the drawing of the regular polygon graph (12).

According to the technical scheme disclosed above, the beneficial effects of the invention are as follows:

the ruler and the using method thereof can draw the pre-designed regular polygon pattern only by measuring the angle and the length once, are convenient to use, are not easy to generate accumulated errors due to repeated measurement, and can be suitable for drawing small patterns or large engineering lofting.

Drawings

Scale assembly I of fig. 1.

Fig. 2 scale assembly II.

Fig. 3 scale assembly I and assembly II assembly diagrams and use step one.

Fig. 4 scale uses step two.

Fig. 5 is a drawing of a regular polygon pattern.

The following are marked in the figure: 1. a scale assembly I; 2. a circular hole; 3. printing a protractor; 4. printing length scales; 5. a scale assembly II; 6. printing a mark line; 7. the nut fixing device can be screwed down; 8. positioning a point A; 9. positioning a point B; 10. positioning points C; 11. positioning a point D; 12. a regular polygon pattern to be drawn.

Claims

1. A scale tool is characterized in that a component I (1) and a component II (5) are spliced and combined together through placing a screw fixing device (7) which can be screwed tightly in a reserved round hole (2); length scale marks (4) are printed on all the components in advance; preferably, if a transparent material is used, the protractor (3) and the identification line (6) can be printed on the assembly I (1) and the assembly II in advance.

2. The use method of the ruler according to claim 1, wherein after the included angle α between the component I (1) and the component II (5) is fixed according to the shape of the pre-designed regular polygon (12), three angular points and the connecting lines thereof are drawn according to the side length L of the pre-designed regular polygon (12), the ruler is rotated to align the included angular point between the component I (1) and the component II (5) with the last point drawn in the previous step, the side printed with the scale on the component I (1) is aligned with the last connecting line drawn in the previous step, the next angular point is drawn on the component II (5) at the scale corresponding to L and the regular polygon (12) is drawn in sequence.