JPH03208696A - Ruler - Google Patents

Abstract

PURPOSE:To draw a desired triangle only by drawing a line along a ruler by providing an engaging opening part to one of two strip rulers fixed at a right angle in the longitudinal direction thereof and providing a separate strip ruler thereto in a slidable manner and forming an arbitrary right-angled triangle on the inner peripheral sides of three strip rulers. CONSTITUTION:Strip rulers A, B are fixed so as to mutually cross at a right angle. A long groove 1 is provided to the strip ruler B along the longitidinal direction thereof as an engaging opening part and a strip ruler C is engaged with the long groove 1 of the strip ruler B by a slidable and fixable fulcrum E. For example, the fulcrum E is constituted of a washer 2, a screw 3 and a nut 4. Further, length graduations 6 are respectively applied to the inner edges (a), (b), (c) of the strip rulers A, B, C on the inner peripheral sides thereof and the graduations of the strip rulers A, B are applied using the right-angled crossing point of both rulers A, B as a reference point. By this constitution, when a right-angled triangle whose two sides forming a right angle have predetermined lengths in drawn or a right-angled triangle whose one side forming a right angle and oblique side have predetermined lengths is drawn, a predetermined right-angled triangle can be easily constituted. Further, when a protractor 7 revolvable around the fulcrum E is together engaged with the fulcrum E, user's convenience is improved.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a ruler that can easily and reliably draw triangles and quadrilaterals, and the ruler of the present invention is also useful as a teaching material for learning about triangles and quadrilaterals. It is something.

(Prior art and open problem to be solved by the invention) Conventionally, for example, when drawing a rectangle with a given side length as shown in FIG. Next, use a triangular ruler to draw a line MO perpendicular to the MN line from point M to the given dimensions, and then draw a line MO perpendicular to the MO line from point O or from point ○ to MN. Draw an OP line parallel to the line according to the given dimensions,
Finally, a straight line is drawn connecting point P and point N to complete the rectangle, and the same procedure is basically followed when using a drafter. This is a tedious and time consuming task. Moreover, there may be errors in the dimensions of sides MN, No., ○P, or the point M
And there may be an error in the vertical line drawn from point P,
The lines drawn perpendicularly to the OP line from point P do not intersect at point N, that is, if you simply connect points P and N, you will rarely make the mistake of creating a distorted rectangle. do not have.

Also, when drawing on paper or marking on a steel plate, etc., for example, a square composition is a rectangular iron plate with triangles of the same size, such as when drawing right triangles on the four corners to cut out the four corners. It is often the case that the precept of drawing multiple quadrilaterals is marked, but when drawing using a triangle ruler or drafter as in the past, it is necessary to draw one triangle and one quadrilateral of the same size. There was the inconvenience of having to draw the drawing multiple times by following the steps described above.

In order to eliminate the above-mentioned difficulties and inconveniences, the present invention creates triangles and quadrilaterals on paper, etc. by sequentially measuring lengths and angles on paper, etc., using a triangular ruler, straight line ruler, etc., as in the conventional method. A drawing based on the idea of forming arbitrary triangles or quadrilaterals with given dimensions on the ruler itself, and then drawing figures on paper etc. to match the figures formed on the ruler itself. This paper proposes a ruler that makes it possible to

-4- (Means for Solving the Problems) The present invention provides a structure that extends in the longitudinal direction of the band rulers on at least one of the two side band rulers A and B fixed to intersect at right angles to each other. A matching opening is provided, and a band ruler C is slidably engaged with band ruler A or B along the opening, and an arbitrary right triangle is formed on the inner periphery of the engaged band rulers A, B, and C. It is characterized by being able to be formed.

Further, the present invention provides three band rulers each having an engaging opening extending in the longitudinal direction so as to form a triangle, and to engage each other so as to be slidable along the opening. It is characterized in that an arbitrary triangle can be formed on the inner circumferential side of the three band rulers that are combined.

Furthermore, the present invention provides the following features:
and two sets of two-sided band rulers, each having a longitudinally extending engagement opening, so as to form a quadrilateral;
Moreover, they are characterized in that they are slidably engaged with each other along the opening, and any square or rectangle can be formed on the inner peripheral side of the engaged band ruler.

The present invention also provides four band rulers each having longitudinally extending engagement openings that engage each other so as to form a quadrilateral and are slidable along the openings. It is characterized in that any quadrilateral can be formed on the inner circumferential side of the band ruler.

(Examples and Effects) The present invention and examples thereof will be described in detail based on the drawings.

FIGS. 1(A) and 1(B) are a plan view and a side view of the ruler of the present invention used for drawing any right triangle, as seen from the band ruler B side. In the figure, A and B are band rulers fixed to each other so as to cross each other at right angles. This fixing may be done by integrally forming two side band rulers A and B as shown in the figure, or by joining separate band rulers A and B into one body by welding, riveting, etc.

A long groove 1 is provided along the longitudinal direction of the band ruler B on one side as an engaging opening.

C is a band ruler that is slidably engaged with the band ruler B along the long groove 1 by a fulcrum E that is slidable along the long groove 1 of the band ruler B. The fulcrum E is made up of, for example, a washer 2, a screw 3, and a nut 4 as shown in the figure. is engaged with. Therefore, by tightening or loosening the screw 3, the band ruler C can be freely slid along the long groove l of the band ruler B, or can be fixed. In addition, as shown in the figure, length scales 6 are attached to the inner edges a, b, and C of the inner circumferential sides of band rulers A, B, and C, respectively, and the scales of band rulers A and B are at right angles. The scale is marked with the intersection point as the base point.

For example, if the lengths of two sides that sandwich a right angle define a given right triangle, the inner edge of band ruler C should intersect with the inner edges of band rulers A and B at the point of the given length scale. Obi ruler C Obi ruler B
- When adjusted by sliding it along the long groove 1, the inner peripheral sides of the engaged band rulers A, B, and C form a given right triangle, and the ruler itself can be drawn. A right triangle is formed.

Even if the length of one side sandwiching a right angle and the length of the inclined side are given,
If the band ruler C is adjusted by sliding so that the length of the side matches the given value according to the scale of the band ruler, the inner circumferential sides of the engaged band rulers A, B, and C will be at the given right angle. Contemplate the triangle. However, if the length of one side and one angle other than a right angle are given, it is not possible to simply use the length scale of the band ruler to move the given right triangle to the inner circumference of the ruler of the present invention. It is also necessary to use an instrument for measuring angles, that is, a protractor. Therefore, as shown in the plan view in FIG. 2, at the fulcrum E for engaging the band ruler C with the long groove 1 of the band ruler B,
It is convenient if the protractor 7, which can rotate about the fulcrum E, is also engaged. A protractor with a scale of 0 to 90 degrees is sufficient. In the figure, reference numeral 8 denotes a stopper for the protractor, which is provided so that the reference line (line of zero angle) of the protractor coincides with or is parallel to the inner edge of the band ruler B. In addition, the length scale attached to the belt ruler should be inclined at an angle to the inner edge as shown in the figure, rather than the length scale being perpendicular to the inner edges a, b, and C of the belt ruler. It is easier to see the scale if the scale is attached.

The engagement opening provided in the band ruler is not limited to the long groove shown in the construction drawings and FIG. 2. For example, as shown in the side view of band ruler B in Fig. 3, band ruler B is composed of two band ruler pieces L and B2 on the front and back, and band ruler A, which intersects them at right angles, is held at one end. The belt ruler B may be fixed by welding or screwing, and the opening 10 may be provided in the side surface of the band ruler B by clamping the intermediate plate 9 and screwing the other end. The band ruler C is inserted into this opening 10 and engaged with the band ruler B in a plug-in manner.

Further, as shown in FIG. 4, an elongated hole 11 extending in the longitudinal direction of the band ruler may be provided on the side surface of the band ruler, and the band ruler C may be inserted into and engaged with the elongated hole 11. Various other modifications are possible. The fulcrum E is not limited to the screw-and-nut type fulcrum described above, and other modifications are possible.

FIG. 5 is a plan view showing the ruler of the present invention which can draw any triangle. Band rulers A, B and C are each provided with an engaging long groove 1 extending in their longitudinal direction,
Band rulers A and B are inserted into their respective long grooves and can slide within the long grooves, and can be slid along the long grooves of their respective partner band rulers using a fulcrum E similar to that shown in Figure 1 (opening). are engaged with each other. Similarly, obi ruler B
and C are engaged by a fulcrum E2 so as to be slidable along the respective long grooves of the other, and the band rulers C and A are similarly engaged by a fulcrum E3. The ruler shown in Fig. 5 is also engaged using the length scale 6 attached to each band ruler, and also using a protractor if necessary, in the same way as the ruler for right triangles described above. Three obi rulers A,
By appropriately sliding B and C, an equilateral triangle, an isosceles triangle, or any other desired triangle can be formed on the inner periphery of the band rulers A, B, and C.

In addition, although three fulcrums, E1 to E3, are shown in FIG. 5, a child may choose to use only one of these fulcrums.

FIG. 6 is a plan view of the ruler of the present invention, which can form square or rectangular shapes. A band ruler A and a band ruler B, each having a long groove 1 extending in the longitudinal direction, are fixed so as to intersect at right angles to constitute a composite band ruler F, and each of the band rulers is provided with a long groove 1 extending in the longitudinal direction. A composite band ruler G is constituted by a band ruler A' and a band ruler B' fixed to each other so as to intersect at right angles. These composite band rulers having two sides fixed at right angles may have the same shape and length, or may have different shapes and lengths.

These two sets of composite band rulers are engaged with each other to form a quadrilateral by means of fulcrums E1 and E2, similar to those shown in FIG. 1 (opening), which are slidable in the long grooves 1. That is, the belt ruler A and the belt ruler B' are engaged with each other by the fulcrum E1 inserted through both the long grooves of the belt ruler A and the long groove of the belt ruler B' so that they can slide along the long grooves of the other, and the belt ruler Band ruler B and band ruler A' are engaged with each other by a fulcrum E2 inserted through both the long groove of B and the long groove of band ruler A' so that they can slide along the long groove of the other. . In the ruler shown in FIG. 6, the engaged band rulers can also be adjusted by sliding the composite band rulers F and G along the long grooves of the other party using the length scale 6 attached to the band ruler. A desired square or rectangle can be formed on the inner peripheral side of A, B, A' and B'.

The ruler of the present invention shown in FIG. 7 can be any trapezoid, parallelogram,
It is a ruler that can be used to determine the shape of other quadrilaterals, and the figure shows its plan view. The four separate band rulers A, B, C and D each have a long groove ■ extending in the longitudinal direction, and these band rulers have four supporting points El, E2, E2, which can slide in the long groove. E3 and E4 engage each other in a quadrilateral manner. That is, the first
As shown in Figure (B), a similar fulcrum E1 is inserted through both the long grooves of band ruler A and band ruler B, so that band ruler A and band ruler B can each be slid along the long grooves of the other. engaged. Similarly, band ruler B and band ruler C are engaged at a fulcrum E2 so as to be able to slide along the long groove -12 of the other, and band ruler C and band ruler D are engaged at a fulcrum E3 so that they can slide along the long groove in the longitudinal direction. is engaged so as to be able to slide.

The band ruler D and the band ruler A are also engaged in a similar manner through a fulcrum E4. In the ruler shown in Fig. 7, the length scale attached to each band ruler is used to slide each band ruler into the long groove of the mating partner, using a protractor if necessary. By doing so, a desired trapezoid, parallelogram, or other quadrilateral can be formed on the inner peripheral side of the engaged band ruler.

Figures 5 to 7 above show only the long grooves as the engagement openings provided in the band rulers, and show only the case where the band rulers are engaged with each other by fulcrums inserted through the long grooves. An opening IO or elongated hole 11 like this is provided on the side of the band ruler, and another band ruler is inserted into this opening or elongated hole, and the inserted band ruler is engaged so as to slide along the opening or elongated hole. Of course, it can be modified as appropriate, such as by making it match.

(Effects of the Invention) As described above, the ruler of the present invention is capable of forming desired right triangles, other triangles, and squares, rectangles, and other quadrilaterals on the inner periphery of the mutually engaged band rulers. The desired triangle formed on the ruler itself can be drawn at the desired position on the drawing paper, iron plate, etc. by simply applying the quadrilateral and drawing a line. Formation allows you to draw or mark a quadrilateral, and it is faster and easier to draw or mark a quadrilateral than when drawing or drawing while sequentially taking lengths and angles using a conventional triangular ruler etc. You can do brats. Moreover, since the desired triangular formation is a quadrilateral in the ruler itself of the present invention,
Before drawing on drawing paper, iron plate, etc., triangle formation allows you to carefully check whether there are any mistakes or errors in the composition of the quadrilateral, and you can draw and mark without mistakes. Having a desired triangle or quadrilateral formed on the ruler itself is extremely convenient when drawing or marking multiple identical triangles or quadrilaterals one after another. Furthermore, when drawing a triangle or quadrilateral using the ruler of the present invention, a line is drawn along the inner circumference of the engaged band ruler, so the intersection of the lines, that is, the corner of the triangle or quadrilateral, is It also has the advantage of being able to draw clearly.

The ruler of the present invention is used for drawing or drawing triangles and quadrilaterals, and not only has the above-mentioned great effect, but also the ruler itself forms triangles and quadrilaterals, It can be effectively used as a teaching material for learning about triangles and quadrilaterals by making use of the formed figures, and also by using the length scale attached to the ruler and a protractor if necessary. be.

[Brief explanation of drawings]

FIGS. 1A and 1B are a plan view and a side view of the ruler of the present invention for drawing right triangles, and FIG. 2 is a plan view of the ruler of the present invention equipped with a protractor. 3 and 4 are side views showing other examples of the engagement opening. Fifth
The figures are plan views of the ruler of the present invention for drawing arbitrary triangles, Figure 6 is the ruler of the present invention for drawing squares or rectangles, and Figure 7 is the ruler of the present invention for drawing arbitrary quadrilaterals. It's 15 years old. FIG. 8 is a diagram for explaining the drawing of a rectangle using a conventional triangular ruler or the like. (Explanation of symbols) A. B, C, D, A' and B'--band ruler, a, b
and c-inner edge of band ruler, E, El, E2, E3 and E4... fulcrum, 1... long groove, 2... washer 3...
... Screw, 4... Nut, 5... Hole, 6... Scale, 7... Protractor, 8... Stopper, 9... Intermediate plate,
10...Aperture, l1...Long. one or more one

Claims (1)

[Claims] 1. An engagement opening extending in the longitudinal direction of the band ruler is provided on at least one of the two side band rulers A and B fixed to each other so as to intersect at right angles, and the band ruler C is It is characterized in that it engages band ruler A or B in a slidable manner along the opening, and forms an arbitrary right triangle on the inner circumferential side of the engaged band rulers A, B, and C. A ruler. 2. The ruler according to claim 1, wherein the protractor is rotatably engaged with a fulcrum point at which the band ruler C is engaged with the engagement opening of the band ruler B. 3. Three band rulers each having longitudinally extending engagement openings are engaged with each other so as to form a triangle and are slidable along the openings. A ruler characterized in that any triangle can be formed on the inner circumferential side of the band ruler. 4. Two sets of two-sided band rulers, fixed at right angles to each other and each provided with a longitudinally extending engagement opening, so as to form a quadrilateral, and with said openings in place. 1. A ruler characterized in that the rulers are slidably engaged with each other along the rulers, and any square or rectangle can be formed on the inner circumferential side of the engaged band ruler. 5. Four band rulers each having an engaging opening extending in the longitudinal direction are engaged with each other so as to form a quadrilateral and are slidable along the openings. A ruler characterized in that an arbitrary quadrilateral can be formed on the inner circumference side of the ruler. 6. Having a length scale on the inner circumferential edge of the engaged band ruler,
6. A ruler according to claim 1, 3, 4, or 5, characterized in that the scale is inclined with respect to the edge.