JPS5852960Y2 - Perspective drawing tools set - Google Patents

Description

[Detailed explanation of the invention] As a method of drawing a perspective view based on a plan view in which the landscape seen from a fixed point is projected onto an upright screen at an arbitrary position, the coordinates that the target point has with respect to two orthogonal axes on the screen are A so-called coordinate drawing method is known that calculates .

Furthermore, a drawing method that eliminates the need for any calculation by measuring the length corresponding to these coordinates on a diagram has already been invented (Japanese Patent Application No. 55-039859).

The present invention relates to a drawing tool set that is convenient for carrying out the latter method.

As illustrated in Figures 1 and 2, this set includes a transparent plate 1,
It consists of a rotating ruler 2, a guide ruler 3, and a height gauge 4.

The transparent plate 1 has a graduated screen line 1a and a reference line 1b perpendicular to the screen line 1a, and has a side edge 1C parallel to the reference line, so that a viewpoint E can be set at any position on the reference line.

The rotating ruler 2 is a narrow body, and one end thereof is pivotally connected to the viewpoint E by a pin.

The guide ruler 3 can slide along the side edge 1C1 of the transparent plate or another side edge parallel thereto, such as the side edge of the drawing board.

The height gauge 4 is built into the guide ruler 3 so that it can be moved in and out orthogonally thereto, and has a scale carved on one side.

This scale should be readable on the left and right sides with the zero point as the center.

The present invention configured as described above is used as follows.

Place the plan view P under the transparent plate, and draw the screen line 1a and the reference line 1b.
, position the viewpoint E appropriately.

Now, for a point A on a plan view, a case will be explained in which the coordinates x and y of the position projected onto the screen are determined.

Viewpoint E is assumed to be on the horizon.

First, the rotary ruler 2 is rotated around the viewpoint E, and the coordinate X corresponding to the distance X from A to the reference line is read from the intersection of the AE line and the screen line 1a as shown in FIG.

Next, shift the guide ruler 3 along the side edge 1C so that the height gauge passes through point A, adjust the height gauge in and out, align the zero point of the scale with the reference line 1b, and move the height gauge on the height gauge. A
Determine point a by taking the height Y of the point, and read the coordinate y from line aE as shown in FIG.

The way to find the coordinate y as described above is to take the AE line connecting point A of height Y and E of zero height as the hypotenuse, and draw the right triangle formed directly below the hypotenuse into a plane perpendicular to the reference line 1b. Project it, rotate it 90 degrees to measure the scale, and place it on the horizon.
It can be easily understood if you think of it as a drawing.

In a similar manner, the coordinates x and y of B, C, .

Although the case where the viewpoint E is placed on the horizon has been exemplified above, the height position of the viewpoint is not limited thereto.

Read the altitude of the viewpoint on the height gauge and set it as reference line 1.
By superimposing it on b, all can be handled.

The same applies to the arrangement position of the plan view with respect to the reference line and the screen line.

In addition, the above description is based on the case where the height Y of each point is indicated separately by a number, but if there is a front view or side view, the length on the figure can be used as a divider instead of a number to determine the height. It can also be transferred onto the game.

However, the use of a divider is complicated, and the method exemplified below may be used instead.

Assume that the side view S is on the same scale as the plan view P, and the viewpoint E is also on the horizon.

As shown in Fig. 6, the line that serves as the reference for height measurement in the side view S is superimposed on the reference line 1b and fixed under the transparent plate, and the guide ruler 3 is slid and adjusted to the solid line position, and the height gauge is A on 4
Mark the height Y of the point.

If this is directly translated in parallel to the chain line position, y can be found from Y using the same procedure as in FIG. 4.

If the viewpoint E has a height difference from the horizon, the side view S may be shifted from the reference line 1b to the left or right by that amount.

In any case, since the height gauge 4 is simply moved in parallel along the side edge 1C in this case, the guide ruler and the height gauge may be integrated.

Although an invention (Japanese Patent Publication No. 48-1546) with a similar purpose to the present invention is known, it requires four rulers in addition to a drawing stand, and involves complicated operations.

In contrast, the present invention is characterized in that it can be carried out simply and quickly using a small number of tools.

[Brief explanation of drawings]

Fig. 1 is a plan view of the transparent plate and rotating ruler, Fig. 2 is a plan view of the guide ruler and height gauge, Fig. 3 is an explanation of how to find the coordinate X, and Fig. 4 is an explanation of how to find the coordinate y. 5 is a perspective view obtained, and FIG. 6 is an explanatory diagram of how to determine the coordinate y from a side view. 1-transparent plate, 1a-screen line, 1b-reference line, 1C side edge,
2-rotating ruler, 3-guiding ruler, 4-height gauge, E-viewpoint, P-one plan view, S-side view.

Claims (1)

[Scope of utility model registration request] A transparent plate having a reference line and a scaled screen line perpendicular to each other, sides parallel to the reference line, and allowing a viewpoint to be set at any position on the reference line, and a pin at one end to the viewpoint on the transparent plate. a narrow rotary ruler that is pivotably mounted on the transparent plate and can be rotated around the viewpoint; a guide ruler that is slidable along the side of the transparent plate or any side parallel thereto; and a guide ruler that can be moved in and out orthogonally to the side of the transparent plate. A perspective drawing tool set consisting of a built-in height gauge with a scale carved on one side.