JPH11208189A - Circumferential circle center radiation reduction rule - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circumferential circle center radiation reduction rule for grasping simply a far-away focus (VP) required for drawing an outer appearance perspective drawing on a small drawing desk. SOLUTION: An outer king wheel guide plate slide slit 2, a shaft supporting hole 3 and a circle center graduation 17 are provided on a circumferential ring wheel box 1, and an outer ring wheel 5 with an outer ring guide plate 8 on a shaft 4 and an inner ring wheel 6 are so fitted as to rotate coaxially, and the outer ring wheel 5 so fitted as to slide the shaft 4, and an outer ring wheel rotation hole 11, an inner ring wheel rotation hole 12, a radius fluctuation plate slide slit 10 and a graduation 16 are provided on a rule plate 9. The radius fluctuation plate 13 with a circumferential point hole 14 is fitted on the radium fluctuation plate slide slit 10 by a radium fluctuation plate slide fixing screw 15, and the shaft 4 with the outer ring wheel 5 and the inner ring wheel 6 is fixed on the shaft supporting hole 3 and the outer ring wheel guide plate slide slit 2 of the circumferential ring wheel box 1 by an outer ring wheel guide plate fixing screw 7, and the circumferential ring wheel box 1 on which the outer ring wheel 5 and the inner ring wheel 6 are fitted in conformity with the sections of the outer ring wheel rotation hole 11 and the inner ring wheel rotation hole 12 of the rule plate 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ruler having a device for writing a part of a large circumference and accompanying radial radiation on a narrow desk.

[0002]

2. Description of the Related Art Conventionally, when writing a part of a large circumference and accompanying concentric radiation on a narrow desk or on a drafting table, an extension of the desk is used to take a large compass or a central point. I had to write the drawings with a stick ruler, etc., and it was troublesome and simple, but it was exaggerated, and it was difficult and troublesome.

[0003]

Therefore, it is possible to draw a plan view or an elevation view of a reasonable size on a desk or a drafting table, but if a perspective view of the exterior is drawn, it will be smaller than the elevation view. . The present invention was invented in order to easily and easily draw a perspective view whose contents are well understood in the drawings by setting the center of the circle farther than the drawing table.

[0004]

Now, this structure will be described. (A) A peripheral wheel box 1 is provided with an outer wheel guide plate slide elongated hole 2, a shaft receiving hole 3, and a center of gravity scale 17. (B) An outer wheel 5 having an outer wheel guide plate 8 set on a shaft 4 and an inner wheel 6 are mounted so as to rotate coaxially.
Is mounted so that the shaft 4 slides. (C) Outer wheel rotation hole 11 and inner wheel rotation hole 12 in ruler plate 9
And a radius variable plate slide slot 10 and a scale 16 are provided,
The radius variation plate 13 provided with the circumferential point hole 14 is mounted on the radius variation plate slide long hole 10 by the radius variation plate slide fixing screw 15. (D) The shaft 4 having the outer wheel 5 and the inner wheel 6 is fixed to the shaft receiving hole 3 of the circumferential wheel box 1 and the elongated hole 2 of the outer wheel guide plate by the outer wheel guide plate fixing screw 7. (E) The circumferential wheel box 1 on which the outer wheel 5 and the inner wheel 6 are mounted is fitted to and fitted with the outer wheel rotating hole 11 and the inner wheel rotating hole 12 of the ruler plate 9. This is a circular centered radiation shortening ruler configured as described above.

[0005]

The operation of the present invention will now be described. The center of the circle is generated by changing the size of the outer wheel 5 and the inner wheel 6 and rotating them coaxially. According to the present invention, when the inner wheel 6 is made smaller than the outer wheel 5, the center of gravity is set to the right from the circumferential wheel box on the drawing, and the ruler is moved in accordance with the rotation of the outer wheel 5 and the inner wheel 6. The ruler moves in a circle. Also, by sliding the outer wheel 5 by the outer wheel guide plate 8, the position of the center of the circle changes with respect to the ruler, and the ruler moves in a circle accordingly, and the circle moves on the ruler plate 9. Heart radiation can be written and the radius variation plate 13
And the circumference can be written using the circumference point hole 14.

[0006]

According to the present invention, the position of the center of the circle is set far by setting the position of the outer wheeled vehicle 5, and the vanishing point (V) in the perspective projection without passing through the center of the circle is set.
Since the radial radiation from P) can be shortened and drawn, a large external perspective view can be easily drawn. In addition, if the radius variable plate 13 is set on the basis of the position of the circular center determined by the position setting of the outer wheel 5, the radius can be increased. Since a part of the circumference is freely applied within the range of the variable plate slide elongated hole 10, a large drawing can be drawn in a short time in a predetermined drawing board.

[Brief description of the drawings]

FIG. 1 is a perspective view of the present invention (partially open).

[Explanation of symbols]

 1 is a circumferential wheel box 2 is an outer wheel guide plate slide slot 3 is a shaft receiving hole 4 shaft 5 outer wheel 6 inner wheel 7 outer wheel guide plate fixing screw 8 outer wheel guide plate 9 ruler plate 10 radius variable plate slide length Hole 11 Outer wheel rotation hole 12 Inner wheel rotation hole 13 Radius variation plate 14 Circular point hole 15 Radius variation plate Slide fixing screw 16 scale 17 circle center scale

Claims (1)

[Claims] (1) A circumferential wheel box 1 is provided with an outer wheel guide plate sliding slot 2, a shaft receiving hole 3, and a center of gravity scale 17. (B) The outer wheel 5 and the inner wheel 6 having the outer wheel guide plate 8 set on the shaft 4 are mounted so as to rotate coaxially and coaxially, and the outer wheel 5 is mounted so as to slide the shaft 4. (C) Outer wheel rotation hole 11 and inner wheel rotation hole 12 in ruler plate 9
And a radius variable plate slide slot 10 and a scale 16 are provided,
The radius variation plate 13 provided with the circumferential point hole 14 is mounted on the radius variation plate slide long hole 10 by the radius variation plate slide fixing screw 15. (D) The shaft 4 having the outer wheel 5 and the inner wheel 6 is fixed to the shaft receiving hole 3 of the circumferential wheel box 1 and the elongated hole 2 of the outer wheel guide plate by the outer wheel guide plate fixing screw 7. (E) The circumferential wheel box 1 on which the outer wheel 5 and the inner wheel 6 are mounted is fitted to and fitted with the outer wheel rotating hole 11 and the inner wheel rotating hole 12 of the ruler plate 9. This is a circular centered radiation shortening ruler configured as described above.