JP3466086B2 - Straightedge - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a straight edge ruler used for drawing and measuring dimensions.

[0002]

2. Description of the Related Art Conventionally, a straight ruler having a transparent plastic strip plate ruler body has been used for drawing and measuring dimensions. As shown in FIG. 7, in this type of straight ruler, generally, a scale line 23 and a numeral 24 are formed on a lower surface 22 along one side edge 21 of the ruler body 20 and an upper surface 25 of the ruler body 20. The scale line 23 and the like can be visually recognized from the side. Further, along the one side edge 21 of the ruler body 20, an inclined surface 26 that is inclined downward toward the one side edge 21 is formed on the upper surface 25 side of the ruler body 20, and other than the inclined surface 26 of the ruler body 20. In the part (2), it is possible to easily perform drawing and measurement along the scale line 23 while ensuring a required plate thickness. Further, on the lower surface 22 of the ruler body 20, reference lines, grid-like grid scale lines and the like (not shown) extending in parallel or at right angles with the one side edge 21 are formed as necessary.

[0003]

In the above-described conventional straight ruler, the inclined surface 26 and the upper surface 25 formed on the upper surface 25 side of the ruler body 20 along the one side edge 21 of the ruler body 20.
Intersect with to form a sharp corner 27,
When the straight ruler is viewed from above, its corner portion 27 is the ruler body 2
It will appear as a contour line parallel to the one side edge 21 of 0. Therefore, as shown in FIGS. 7A and 8, when the scale line 23 formed on the lower surface 22 of the ruler body 20, the reference line, or the straight line A on the paper surface is viewed from above the straight ruler. The contour line of the corner portion 27 becomes an eyesore. In particular,
When working under illumination light, the light that has passed through the upper surface 25 and the light that has passed through the inclined surface 26 from above converges below the corners and forms a light line or band parallel to the contour line. There is a problem in that the line 23 and the like, the line on the paper, and the like become even harder. In addition, the scale line 23 on the lower surface 22 of the ruler body 21 may be seen as discontinuously bent at the position of this contour line, or the straight line A and the like on the paper surface may be seen as being divided at the position of this contour line. It will be difficult. In addition,
In FIG. 8, a state in which the scale lines 23 and the numbers 24 formed on the lower surface 22 of the ruler body 21 are visible from above is omitted.

Therefore, an object of the present invention is to make it possible to thin a side edge having a graduation line while facilitating required thickness and facilitate drawing and dimension measurement, and when the lower surface is viewed from the upper surface side. (EN) It is possible to provide a straight edge ruler that can avoid a phenomenon in which an unpleasant contour line can be seen and a scale line or the like on a paper surface is difficult to see due to the effect.

[0005]

In order to solve the above-mentioned problems, a straight ruler of the present invention comprises a transparent strip-plate-like ruler body having a lower surface which comes into contact with an object such as a paper surface. A large number of graduation lines including a minimum pitch graduation line extending from the one side edge toward the other side edge are formed on the lower surface along one side edge of the main body, and the upper surface of the ruler main body is parallel to the lower surface. And an inclined surface that linearly inclines downward from the vicinity of the top surface portion to the one side edge, and the upper end to the lower end of the inclined surface has a length that covers the minimum pitch scale line. In addition, it is characterized in that it is smoothly continuous from the upper end of the inclined surface to the top surface portion via a convex curved surface.

According to the above structure, since the upper surface of the ruler body has the top surface portion parallel to the lower surface, the operability of the straight ruler is improved, and the thickness required for strength between the top surface portion and the lower surface is increased. It is possible to ensure the uniformity of thickness required for quality maintenance. Also, because one side edge of the ruler body is formed thin by the inclined surface on the upper surface side, drawing and dimension along one side edge of the ruler body while ensuring the thickness required for strength on the top surface side of the ruler body. The measurement can be easily performed. Moreover, since the inclined surface has a length covering the minimum pitch graduation line from the upper end to the lower end, at least the minimum pitch graduation line can be seen through the inclined surface linearly extending from above the ruler body. You can see the minimum pitch scale line without distortion. Moreover, since the inclined surface is smoothly continuous from the upper end to the top surface portion through the convex curved surface, an annoying contour line can be seen at the boundary between the top surface portion and the inclined surface of the upper surface, or on the paper surface. It is possible to prevent problems such as lines becoming difficult to see.

Further, in the straight ruler of the present invention, in the above structure, the top surface portion of the ruler body extends in parallel with the lower surface to the other side edge, and the ruler body extends along the other side edge of the ruler body. Is characterized in that a step or an inclination is formed on the lower surface of the so as to form a gap between the lower surface of the object and the object contacting the lower surface.

According to the above structure, the top surface of the ruler body extends parallel to the lower surface of the ruler body in parallel with the lower surface of the ruler body. Since there is a step or slope that forms a gap between the object and the object to be abutted against, the lever action can be easily generated by pushing the top surface portion near the other side edge of the ruler body from above. The one side edge of the ruler body can be easily lifted up.

The inclined surface formed along the one side edge with the scale line on the upper surface side of the ruler body together with the top surface portion can be set to an arbitrary inclination angle, but the smaller the inclination angle formed with the lower surface is, the lower the surface becomes. The formed graduation lines can be seen from above through the inclined surface with little distortion. Therefore, it is preferable to set the inclination angle of the inclined surface so that the inclined surface has a length that substantially covers the minimum pitch scale line at least.

Further, the radius of curvature of the curved surface connecting the inclined surface of the ruler body and the top surface portion is at least the boundary between the inclined surface and the top surface portion when the straight ruler is visually observed at a distance of 20 to 40 cm from the eyes in normal use. However, it is preferable to increase the radius of curvature of the curved surface because the distortion of the line seen from above through the curved surface becomes smaller. However, if the tilted surface of the ruler body is made large enough to make it curved as a whole, the light from the lighting etc. will be reflected on the curved surface over a wide area when it is viewed from above, and will enter the eyes of the user. It becomes easier and hinders the work,
It is important to leave a linear slope.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

[0012]

1 and 2 show a first embodiment of the present invention. FIG. 1 (a) is a partially broken plan view of a straight ruler, and FIG. 1 (b) is a partially broken bottom view. , Fig. 1 (c) is an enlarged end view,
FIG. 2 is a schematic perspective view of essential parts showing a usage state of the straight edge ruler of FIG.

First, referring to FIG. 1, the straight ruler includes a strip plate-shaped ruler body 1 made of a plastic such as transparent acrylic, and the ruler body 1 is a lower surface 2 that is brought into contact with an object such as a paper surface. And an upper surface 3 (see FIG. 1C). A scale line 5 and a numeral 6 indicating its size are formed on the lower surface 2 of the ruler body 1 along one side edge 4 (see FIG. 1B). The scale line 5 and the numeral 6 are shown in FIG.
As shown in (a), since it is for viewing through the ruler body 1 from above the ruler body 1, the numeral 6 attached to the scale line 5 is formed in a laterally inverted state with respect to the lower surface 2. Further, although not shown, a reference line, a grid scale line, or the like extending parallel or at right angles to the one side edge 4 may be formed on the lower surface 2 of the ruler body 1. These scale lines 5, numeral 6, reference lines, grid scale lines and the like can be formed on the lower surface 2 of the ruler body 1 by a method such as silk printing.

The upper surface 3 of the ruler body 1 has a top surface portion 3a parallel to the lower surface 2 and an inclined surface 7 which is inclined downward from the top surface portion 3a toward one side edge 4 of the ruler body 1. The inclined surface 7 is continuous with the top surface portion 3a of the ruler body 1 via a curved surface 8 having a radius of curvature R (see FIG. 1 (c)).

The ruler body 1 having the curved surface 8 between the inclined surface 7 and the top surface portion 3a can be manufactured by cutting, but if it is manufactured by injection molding of plastic, it can be manufactured easily at low cost. . In that case, if there is a uniform thickness between the lower surface 2 and the top surface portion 3a of the ruler body 1,
Since it is easy to prevent the deformation of the injection-molded ruler body 1 due to the contraction action, it is possible to provide a straight ruler of excellent quality.

In the straight ruler having the above structure, the ruler body 1
Since the upper surface 3 of the above has a top surface portion 3a parallel to the lower surface 2, the operability of the straightedge is improved and the top surface portion 3a and the lower surface 2
It is possible to secure the uniformity of the thickness required for strength and the thickness required for maintaining quality between the above and. Further, since it has the inclined surface 7 that is inclined downward toward the one side edge 4 of the ruler body 1, it is possible to easily perform drawing and dimension measurement along the one side edge 4 of the ruler body 1. Moreover, since the inclined surface 7 of the ruler body 1 and the top surface portion 3a are continuous through the curved surface 8 and there is no corner portion, when the ruler body 1 is viewed from above, the top surface portion 3a and the inclined surface 7 are An unpleasant contour line is not visible at the boundary (see FIGS. 1A and 2), and an undesired convergent light line due to illumination light is formed below the boundary between the top surface 3a and the inclined surface 7. It is possible to prevent the band from being formed. Further, as shown in FIG. 2, when a straight line A or the like on the paper surface is viewed obliquely from above the straight ruler, the straight line A appears to be slightly distorted, but the boundary between the upper surface 3 of the ruler body 1 and the inclined surface 7 Since it is possible to prevent the scales 5 and the like formed on the lower surface 2 from being discontinuously bent and seen, it is possible to improve the usability of the straight edge ruler. Note that, in FIG. 2, a state in which the scale lines 5 and the numbers 6 formed on the lower surface 2 of the ruler body 1 are visible from above is omitted.

It is possible to make the entire inclined surface 7 of the ruler body 1 curved and continuous with the upper surface 3. However, if the entire inclined surface 7 is curved, when the straight ruler is viewed from above, it will not be illuminated. It is preferable to leave the inclined surface 7 as in the above embodiment, because light is reflected on the curved surface over a wide range and easily enters the eyes of the user, which hinders the work.

3 (a), 3 (b) and 3 (c) are end views of the straightedges showing the second, third and fourth embodiments obtained by modifying the first embodiment of the present invention.

The straightedge of the second embodiment shown in FIG. 3A is
Scale lines and numbers (not shown) are formed on the lower surface 2 along the one side edge 4 and the other side edge 9 of the ruler body 1, respectively, and along the one side edge 4 and the other side edge 9 of the ruler body 1. On the upper surface 3 side, inclined surfaces 7 and 7 similar to those in the first embodiment are formed symmetrically, and these inclined surfaces 7 and 7 are continuous with the upper surface 3 via curved surfaces 8 and 8 having a radius of curvature R, respectively. is doing.

On the other hand, in the straight rulers of the third and fourth embodiments shown in FIGS. 3 (b) and 3 (c), a scale line and a number are formed on the lower surface 2 along one side edge 4 of the ruler body 1. (Not shown) is formed, and an inclined surface 7 similar to that of the first embodiment is formed on the upper surface 3 side along one side edge 4 of the ruler body 1, and the inclined surface 7 is It is continuous with the upper surface 3 via a curved surface 8 having a radius of curvature R. And FIG. 3 (b)
In the straight ruler of the third embodiment shown in FIG. 3, a step portion 10a is formed on the lower surface of the ruler body 1 along the other side edge 9 of the ruler body 1. Further, in the straight ruler of the fourth embodiment shown in FIG. 3C, an inclined surface 10b is formed on the lower surface of the ruler body 1 along the other side edge 9 of the ruler body 1. In the case of the third and fourth embodiments, when the upper surface of the ruler body 1 on the side of the other side 9 is pressed on the drafting paper or the like, the one side edge 4 side of the ruler body 1 is easily moved from the paper surface by the lever principle. As it floats up, it becomes easier to grasp the ruler body 1. Further, since a gap is formed between the other side edge 9 of the ruler body 1 and the paper surface, if the other side edge 9 of the ruler body 1 is used when drawing a straight line with an ink-type pen, the ink will be on the paper surface or the like. It can be prevented from entering and spreading between the ruler body 1 and the ruler body 1.

FIG. 4 (a), (b) , (c) and 5 ginseng
And shows the Reference Example 4 (a) is a partially cutaway plan view of the straight edge, FIG. 4 (b) a partially broken bottom view, and FIG. 4 (c) is an enlarged end view, FIG. 6 FIG. It is a principal part schematic perspective view which shows the use condition of the straight edge ruler of FIG. The straight ruler includes a strip plate-shaped ruler body 11 made of transparent acrylic or the like. In the straight ruler of this reference example , one side edge 1 of the ruler body 11 is used.
4, a scale line 15 and a numeral 16 indicating its size are formed on the lower surface 12 thereof. As shown in FIG. 4A, since the scale lines 15 and the numbers 16 are for viewing through the ruler main body 11 from above the ruler main body 11, the number 16 attached to the scale lines 15 is on the lower surface 12. On the other hand, it is formed in a horizontally inverted state (see FIG. 4B). further,
In the straight ruler of this reference example , the upper surface 1 of the ruler body 11
3 is an inclined surface which continuously extends downward from the other side edge 17 of the ruler body 11 or its vicinity to the one side edge 14 (see FIG. 4C). The ruler body 11 whose upper surface is inclined in this way can be manufactured by cutting, but it is preferable to manufacture it by injection molding of plastic because it can be manufactured easily and at low cost. Although illustration is omitted, the lower surface 12 of the ruler body 11 may be formed with a reference line, a grid scale line, or the like extending parallel or at right angles to the one side edge 14. These scale lines 15, numbers 16, reference lines and the like can be formed on the lower surface 12 of the ruler body 11 by a method such as silk printing.

Therefore, in the straight ruler of the above-mentioned reference example , one side edge 14 of the ruler body 11 is formed thin by the inclined surface on the upper surface 13 side, so that the thickness necessary for strength is secured on the other side edge side. It is possible to easily perform drawing and dimension measurement along the one side edge 14 of the ruler body 11. Moreover, since the upper surface 13 of the ruler main body 11 continuously inclines downward from the other side edge 17 of the ruler main body 11 or its vicinity to the one side edge 14, the lower surface of the ruler main body 11 when viewed from above. 12
It is possible to prevent an obtrusive contour line from being visible above the line or to form a light line or band due to the convergence of the illumination light on the lower surface 12 or the paper surface. Further, as shown in FIG. 5, when the lower surface 12 of the ruler main body 11 is brought into contact with the paper surface or the like and the straight line A or the like on the paper surface is viewed from above the ruler main body 11, the straight line A or the like is above the lower surface 12. The bottom surface 12
It is possible to prevent the upper scale line 15 and the like from being discontinuously bent and viewed. In particular, in this reference example, it is possible to prevent the scale line 15 and the line on the paper surface from being distorted above the lower surface 2. Note that, in FIG. 5, the state in which the scale lines 15 and the numbers 16 formed on the lower surface 12 of the ruler body 11 are visible from above is omitted.

6 (a) and 6 (b) are end views of a straight edge ruler showing another reference example, respectively.

[0024] In straightedge reference example shown in FIG. 6 (a) is a step 18a is formed on the lower surface 12 along the other side edge 17 of the ruler body 11, reference example shown in FIG. 6 (b) In the straight ruler of <br />, an inclined surface 18b is formed on the lower surface 12 along the other side edge 17 of the ruler body 11. The step 18a and the inclined surface 18b are the third and the fourth described above.
It has the same function as the step 10a and the inclined surface 10b of the embodiment. On the other hand, in the straight ruler of these reference examples , the upper surface 13 of the ruler body 11 is parallel to the lower surface 12 above the step 18a or the inclined surface 18b.
3a is formed, and the ruler body 1 is formed from the top surface portion 13a.
The section up to the one side edge 14 of 1 is an inclined surface 19.

Also in these reference examples , in the section of the lower surface 12 of the ruler main body 11 which is brought into contact with the paper surface or the like, the upper surface is a continuous inclined surface 19, so that the lower surface 12
It is possible to prevent the graduation lines and the straight lines on the paper surface from being divided in the middle of the upper part of the image and the visible contour line.

[0026]

As is apparent from the above description, according to the structure of the present invention, since the ruler main body has the inclined surface on the upper surface side, the side edge having the scale line is formed while ensuring the thickness necessary for strength. It is possible to reduce the thickness to facilitate drawing, dimension measurement, and the like, and it is possible to prevent an unpleasant contour line from being seen or a line on the paper surface to be seen as divided when the lower face is viewed from above. Therefore, it is possible to provide an easy-to-use straightedge.

[Brief description of drawings]

1A, 1B, and 1C are a partially cutaway plan view, a partially cutaway bottom view, and an enlarged end view of a straightedge, respectively, showing a first embodiment of the present invention.

FIG. 2 is a schematic perspective view of essential parts showing a usage state of the straightedge shown in FIG.

3 (a), (b) and (c) are end views of a straight edge ruler showing second, third and fourth embodiments of the present invention, respectively.

[Fig. 4] (a), (b), and (c) are references of straightedges, respectively.
It is a partially broken plan view, a partially broken bottom view, and an enlarged end view showing a consideration example.

5 is a schematic perspective view of a main part showing a usage state of the straightedge shown in FIG.

6A and 6B are end views of a straight edge ruler showing other reference examples , respectively.

7 (a), (b) and (c) are respectively a partially broken plan view, a partially broken bottom view and an enlarged end view showing a conventional straight edge ruler.

8 is a schematic perspective view of essential parts showing a usage state of the conventional straight edge ruler shown in FIG. 7. FIG.

[Explanation of symbols]

1,11 Ruler body 2,12 lower surface 3,13 upper surface 3a, 13a Top surface part 4,14 One side edge 5,15 scale line 6,16 numbers 7,19 Inclined surface on the top side 8 curved surface 9,17 Other side edge 10a, 18a steps 10b, 18b Sloping surface of lower surface and other side edge

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Actual flat 7-26191 (JP, U) Actual open Sho 56-21701 (JP, U) Actual open Sho 59-901 (JP, U) Actual open Sho 60- 72290 (JP, U) Actually opened 60-88798 (JP, U) Actually opened 61-198089 (JP, U) Actually opened 62-203091 (JP, U) Actually public 49-25336 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) B43L 7/00

Claims (2)

(57) [Claims] 1. A ruler body in the form of a transparent strip plate having a lower surface that comes into contact with an object such as a paper surface is provided, and the lower surface extends along one side edge of the ruler body from the one side edge to the other side edge. A large number of graduation lines including a minimum pitch graduation line extending toward are formed, and a top surface portion in which the upper surface of the ruler body is parallel to the lower surface,
An inclined surface that linearly inclines downward from the vicinity of the top surface portion to the one side edge, and a length from the upper end to the lower end of the inclined surface covers the minimum pitch scale line, A straight edge ruled from the upper end of the inclined surface to the top surface portion via a convex curved surface. 2. The top surface portion of the ruler body extends in parallel with the lower surface to the other side edge, and the lower surface of the ruler body abuts the lower surface along the other side edge of the ruler body. The straight edge ruler according to claim 1, wherein a step or an inclination that forms a gap with an object is formed.