JPH10305692A - Drawing ruler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily draw in a narrow operating area with a wide vanishing point by rotatably mounting both ends of a shaft at bearings provided at both ends of a ruler-like support for drawing a straight line, and mounting a fixed wheel at one end of the shaft and a slide wheel having a slightly different diameter at the other end. SOLUTION: To be used for drawing a perspective drawing, first a predetermined position on a horizontal line is decided as a vanishing point, a ruler A is placed toward its direction, and a straight line is drawn. Then, the ruler A is longitudinally moved, wheels 4, 5 are rolled, and moved in a direction perpendicular to a printing element. In this case, since diameters of the fixed wheel 4 and slide wheel 5 of a common axis are slightly different (the wheel 5 has a larger diameter), it is moved to rotate at the vanishing point as a center. Accordingly, the straight line drawn after moving becomes entirely according to a method for projecting a perspective drawing. And, when a nib is inserted into a pen tip fixing hole 6 provided at a suitable position of the ruler A and the ruler A is moved, a circular arc having the vanishing point as a center is automatically drawn.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as a drawing or drafting ruler suitable for drawing a slightly inclined straight line or a large radius curve in a perspective projection view of a far away point.

[0002]

2. Description of the Related Art Perspective projection is often used to draw a three-dimensional object. For example, in a two-point perspective projection view, only the vertical axis is parallel to the projection plane and the other two axes are inclined, and A left vanishing point and a right vanishing point are set on the line, and a straight line in the direction of the inclined axis is drawn by a straight line converging on the left vanishing point. The drawing method of taking out vanishing points on the left and right in this way is often used in perspective drawings.
To draw this straight line sometimes requires a long ruler.

On the other hand, in order to draw an arc, a compass or a ruler of various rounds made individually is used, and a railroad ruler or the like includes a very large number of sets such as a set of 100 pieces.

[0004]

In such a conventional drawing or drawing tool, a distance to a vanishing point is not realized in a normal drawing board size in a perspective drawing or the like, in spite of expressing a relatively small object. However, even if there is a large drafting board, an extremely long ruler is required, and the workability is very poor.

[0005] In addition, to draw a large radius curve such as 4,000R or 5,000R, a huge compass is required. However, in reality, it is extremely difficult in terms of handling, cost, and the like. Even if a ruler is purchased, only a limited R and a limited length can be drawn, and it takes time to find out from a set of 100 sheets.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a simple tool capable of freely drawing a perspective projection view of a far vision and a large radius curve.

[0007]

The both ends of the shaft (3) are rotatably mounted on bearings (2) provided at both ends of a rule-like support (1) capable of being drawn straight. A fixed wheel (4) is attached to one end of the shaft body (3), and a slide wheel (5) that slides near the other end and has a slightly different wheel diameter that can be fixed is attached to the shaft body (3) to draw a perspective view or the like. It is a ruler (A).

Further, a large radius drawing tool is provided in which a pen tip fixing hole (6) is provided in the ruler-like support (1), and the tip of a drawing writing tool is inserted into the hole so that an arc can be drawn. However, as an equivalent of the hole (6), a V-shaped cut may be provided at the edge of the ruler. It is desirable to provide a plurality of these holes or cuts at equal intervals.

The drawings show specific examples of the ruler of the present invention. Generally, the support (1) is made of resin, the shaft (2) is made of metal, and the wheels (4) and (5) are made of rubber. Under the wheels (4) and (5), a hollow hole (7) is provided so as to contact the paper surface.

Adjacent to the slide wheel (5) is a fastening lock (8) which can be turned by a finger to loosen or close it. This can be satisfactorily dealt with with ordinary known parts.

It is desirable to provide a cover (9) made of acrylic or the like so as to protect the shaft (3) or to easily hold the shaft during use.

[0012]

In order to use the drawing ruler (A) of the present invention for drawing a perspective drawing, for example, a predetermined position on a horizontal line is first set as a vanishing point (P), and the ruler (A) is oriented in that direction. Place and draw a straight line. Next, when the ruler (A) is moved back and forth, the wheels (4) and (5) roll and move in a direction perpendicular to the object line. At this time, the fixed wheel (4) and the slide wheel (5) having a common axis are used. ) Is slightly different (the slide wheel (5) is large), so that it moves so as to rotate about the vanishing point (P) as shown in FIG. Therefore, the straight line drawn after the movement completely conforms to the perspective projection method, and even if the vanishing point (P) is far away, a ruler of that length is not required.

In addition, since the circular motion is performed around the vanishing point (P), the pen tip is inserted into the pen tip fixing hole (6) or the notch provided at an appropriate position of the ruler (A). When the ruler (A) is inserted and the ruler (A) is moved, an arc centered on the vanishing point (P) is drawn by itself. Also in this case, even if the vanishing point (P) is a large radius that is far away, a giant compass or the like is not required, and the size of the radius is adjusted by loosening the tightening lock (8) and adjusting the position of the slide wheel (5). This can be achieved by moving the slider to the left and right and changing the distance to the fixed wheel (4), or by selecting one of a plurality of brush tip fixing holes (6) or cuts.

When it is desired to draw an arc connecting a predetermined start point and an end point, a vertical bisector is drawn between the two points, and
By moving the ruler (A) to the starting point while aligning the center line of the ruler (A) with the ruler (A), and moving the ruler (A) to the opposite side while drawing an image therefrom, the image can be connected to the end point.

[0015]

Embodiment 1 In the drawing ruler (A) as shown in FIGS. 1 and 2, the ruler-like support (1) has a length of 400 mm.
And the shaft body (2) is made of stainless steel having a thickness of about 2 mm. 10mm diameter rubber
A fixed wheel (4) and a slide wheel having a diameter of 12 mm are attached, and the slide wheel (5) is provided with a known fastening lock (8). Below the fixed wheel (4), a width and a length of 7 mm are provided. Under the sliding wheel (5), width 7mm, length 2
A hollow hole (7) of 00 mm is provided and the wheel (4)
The lower end of (5) is projected about 1 mm below the lower surface of the ruler-like support (1). The cover (9) is made of acrylic resin.

[0016]

[Embodiment 2] A pen tip fixing hole (6) having a diameter of 1 mm is formed at an edge portion of the ruler-like support (1) of the above example at intervals of 10 mm.
Approximately 15 are provided to make a ruler for large radius drawing. It should be noted that perspective projection drawing may be used together, and the present invention is not limited to such an example.

[0017]

As described above, according to the present invention, in the perspective projection drawing of the far extinction point, which has conventionally been extremely inconvenient, a wide extinction point can be obtained in a narrow work area without a large drawing board or a long ruler. You can easily draw drawings, and even when drawing a large radius arc, you can easily draw with fine adjustment without the need for a huge compass or a large number of individually prepared expensive rulers. Has a great effect.

[Brief description of the drawings]

FIG. 1 is a plan view of an example of the present invention.

FIG. 2 is a front view of the same example.

FIG. 3 is a plan view showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Regular support 2 ... Bearing 3 ... Shaft 4 ... Fixed wheel 5 ... Slide wheel 6 ... Brush tip fixing hole 7 ... Drilled hole 8 ... Screw lock 9 ... Cover A ... Plotting ruler P: vanishing point

Claims (2)

[Claims] 1. Both ends of a shaft are rotatably mounted on bearings provided on both sides of a ruler-like support, and a fixed wheel is provided on one end of the shaft and the other end is slid near the other end. A drawing ruler, wherein slide wheels having slightly different wheel diameters that can be fixed are mounted. 2. The drawing ruler according to claim 1, wherein a pen tip fixing hole or notch is provided in the ruler-like support.