US 3503129 A
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March 31, 1970 c. E. SAXTON SIGHT RULER FOR PERSPECTIVE DRAFTING Filed May 20. 1968 INVENTOR.
CLARENCE E SAXTON United States Patent 3,503,129 SIGHT RULER FOR PERSPECTIVE DRAFTING Clarence E. Saxton, 4522 Orchard Ave., San Diego, Calif. 92107 Filed May 20, 1968, Ser. No. 730,263 Int. Cl. B431 7/00 US. C]. 33-72 4 Claims ABSTRACT OF THE DISCLOSURE A sight rule for drawing perspective views comprising an integral element forming a straightedge, a mirror disposed at one end of the straightedge at approximately forty-five degrees with respect to the straightedge, a sight on the mirror and a sight at the other end of the element, the sights being in a plane which extends vertically along the pencil guiding edge of the straightedge.
BACKGROUND OF THE INVENTION Field of the invention The invention relates to sight rulers having at least one straightedge and two spaced sights, a line intersecting the sights being in a plane which extends vertically along the pencil guiding edge of the straightedge. A mirror at one end of the straightedge carries one of the sights and the other sight is at the opposite end of the straightedge.
SUMMARY OF THE INVENTION The invention embodies a sight ruler for drawing perspective views. The ruler is an integral element which forms at least one straightedge. One end of the element is bent upwardly at approximately forty-five degrees with respect to the horizontal plane of the straightedge. The mirror is provided with a sight. The opposite end of the element is provided with a sight and these sights lie in a plane which extend vertically along the pencil guiding edge of the straightedge.
Other features and the advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawing wherein a preferred embodiment of the invention is illustrated.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a perspective view of the sight ruler showing diagrammatically how the ruler is aligned with one of two vanishing points.
FIG. 2 is a top plan view of the ruler, but on a larger scale;
FIG. 3 is a view similar to FIG. 1, but showing diagrammatically how the ruler is aligned with the other vanishing point.
DESCRIPTION OF THE PREFERRED EMBODIMENT The ruler 20 is an integral element including a fiat section 22, the opposite sides of which form pencil guiding edges 24 and 26. One end 28, referred to herein as the head end or mirror, is slightly wider than the section 22 and is in the form of a mirror. It is bent upwardly at approximately forty-five degrees with respect to the horizontal plane of the section 22. The mirror 28 is provided with two sights 30 and 32, one sight 30 being in a plane which extends vertically along the pencil guiding edge 24 and the other sight 32 being in a plane which extends vertically along the edge 26.
The opposite or tail end 34 is bent upwardly. This tail end has the same width as that of section 22. The side edges 36 and 38 of tail end 34 provide sights and these sights are aligned, respectively, with edges 24 and 26.
In practicing the invention, a target or guide 40 is placed at the desired left vanishing point, and a similar target 42 is placed at the desired right vanishing point. In drawing a line which projects toward the left target 40, draftsman will align sight 30 on the mirror 28 with sight 36 on the tail end 34 and thus draw a line along edge 24. Since sight 30 is on the mirror, the draftsman, with his eye substantially directed above sight 30, can see by reflection the sight 36 and target 40 and can align the sights with the left target. In drawing a line which projects toward the right target, the draftsman again, with his eye substantially directly above sight 32, can see by reflection the sight 38 and target 42 and can align the sights 32 and 38 with target 42.
As an example, the draftsman, after drawing all lines which project toward a third vanishing point, which lines are here shown at 44-, 46 and 48, he will draw all lines of a perspective view, which lines project toward one of the targets, and in this example the draftsman draw lines 50, 52 and 54, all of which, if projected, would intersect target 40. He utilized sights 30 and 36 and straightedge 24 as shown in FIG. 1. He then utilizes sights 32 and 38 aimed at target 42 to draw lines 56, 58 and 60, as shown in FIG. 3.
The ruler 20 is formed preferably of any material which can function as a mirror or can be polished to form a mirror. The sights 30 and 32 can be of non-reflecting material or material that has a different degree of reflecting value than the mirror. For example, the sights 30 and 32 can have dull surfaces or highly reflective relative to that of the mirror.
It desirable, and as shown in FIG. 2, the top of the section can he graduated to define length such as inches and fractions of inches or a standard ruler 62 can be aflixed. Also, if desirable and as shown in FIG. 2, the extreme front end of the ruler can function as a retainer 64 having holes 66 for supporting the targets when they are not in use.
From the foregoing, it is apparent that I have provided a simple and inexpensive ruler for drawing perspective views. Moreover, the ruler is of such design that the directions of how to use the same are understood readily, and also it can be used effectively and in a simple manner.
While the form of embodiment herein shown and described constitutes preferred form, it is to be understood that other forms may be adopted.
1. A sight ruler for drawing perspective views comprising a straightedge having:
(1) an edge for guiding a pencil,
(2) a vertically extending section having an edge forming a sight,
(3) a mirror, said mirror extending outwardly from and at an angle upwardly from said edge of the straightedge, said mirror being spaced from the sight,
(4) a second sight, said latter being disposed in a position in which a straight line intersects the first mentioned sight and in a plane extending vertically along the said edge of the straightedge.
2. A sight ruler as defined in claim 1, characterized in that the straightedge includes:
(5) a second edge for guiding a pencil, said edges being spaced laterally of one another,
(6) a second vertically extending section having an edge forming a sight,
(7) a second mirror, said second mentioned mirror extending outwardly from and at an angle upwardly from the edge on the second mentioned vertically extending section, said latter edge forming a third sight,
4 said second mentioned mirror being spaced from the References Cited last mentioned sight, 8 a fourth sight, said latter sight being disposed in a UNITED STATES PATENTS position in which a straight line intersects the third 795,065 7/ 1905 g 7 mentioned sight and a plane extending verticall along the second mentioned edge of the straightedg 5 FOREIGN PATENTS 3. A sight ruler as defined in claim 1, characterized in 27,429 1903 Great Britain. that the mirror is disposed adjacent one end of the straightedge and that the vertically extending section comprises HARRY HAROIAN, Pri ary X mineI an upturned edge of the opposite end of the straightedge. m
4. A sight ruler as defined in claim 2, characterized in that the edges of the straightedges are disposed parallelly. 3377, 107