JP2799680B2 - compass - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a compass.

[0002]

2. Description of the Related Art Conventionally, the upper ends of two legs are pivotally connected, a needle is attached to the lower end of one leg, and a writing instrument is attached to the lower end of the other leg to determine the distance between the lower ends of both legs. In general, a compass is used in which a needle attached to one leg is pierced into a sheet as an origin, and a circle is drawn with a writing implement attached to the other leg with the radius between the lower ends of both legs as a radius. However, since this material pierces a needle and leaves a mark on the paper, it cannot be used for hard materials other than paper, for example, iron, acrylic plates, decorative boards and the like. In addition, since it has a needle, there is a risk of sticking a hand, care must be taken in carrying, and a ruler for measuring the distance between both legs is separately required.

[0003] Therefore, a length scale is displayed along one side of the flat plate, and a hole for inserting a writing instrument is formed so as to correspond to the length scale, and the center of the circle matches the zero position of the scale. As described above, a compass in which an origin fitting is rotatably mounted has been proposed. For this, align the origin fitting with the origin position on the paper, insert the tip of the writing implement into the hole at the radius of the circle you want to draw, move the writing implement while pressing and fixing the origin fitting with your finger To draw a circle.

However, since the holes corresponding to the scales have a diameter enough to allow a writing instrument to be inserted, they cannot be formed with a very small space therebetween, and the distance between the holes is limited to about 5 mm. The radius of the circle to be formed can also be changed only at intervals of 5 mm, and it was impossible to draw a circle having a radius corresponding to the intermediate length between the holes using this compass.

[0005] Also, a scale is provided on the left and right from the reference point 0 of the transparent ruler.
When a long hole is made along the left scale,
The moving rotary shaft is slidably fitted in the long hole,
For inserting the core of the writing implement at the corresponding position
Ruler compass with square hole with square hole drilled
It is disclosed in 177492. According to this,
Slide the moving rotary shaft along the long hole to align with the left scale.
The distance from the rotation axis to each square hole.
Can be adjusted so that it can be adjusted from the reference point to the middle between square holes.
A circle with a radius corresponding to the distance at can be drawn.

[0006] However, this one is located at the center of the moving rotation axis.
The position is indicated by a pointer projecting from the axis of rotation
For this reason, use the pointer to slide the
If the needle is inadvertently hooked on an object, it will be easily deformed.
Fruit, error between the display of the center position and the guidance of the moving axis of rotation
This may make it impossible to draw a circle accurately. Also on paper
When this ruler compass is placed on the
Not only can't see the condition of the paper,
Since it is not clear, draw a circle from the position you want to draw
I worry about it.

[0007]

SUMMARY OF THE INVENTION According to the present invention, it is possible to draw a circle on a plate surface of a hard material other than paper without damaging the paper, and to make a circle of any radius without a ruler. Also simple
An object of the present invention is to provide a compass that can be simply and accurately drawn, and that is easy to handle and carry.

[0008]

In order to achieve the above object, a compass of the present invention displays a length scale on one side of a flat plate and forms a writing implement tip insertion portion corresponding to the length scale. An elongated guide hole is formed in the flat plate along the length scale at a position facing the zero scale of the length scale, and an annular origin indicating tool can be rotated and slid in the guide hole. fitted to br /> ability to the <br/> both fit inside the transparent plate of the raw point pointing device, display the origin at the center of the transparent plate, the guide hole
Moving distance of origin along the side edge starting from the 0 scale
The origin position adjustment scale indicating is displayed .

An indicating plate extending in a direction intersecting the length scale is integrally attached to the origin indicating tool, and a fine adjustment scale is displayed along a trajectory of the tip of the indicating plate. May be pivotally attached to a flat plate, and an indicator may be provided at the tip of the indicating plate. The origin may be displayed at the center of the transparent plate as the intersection of the two diameters, and the origin may be displayed as a hole formed at the center of the transparent plate.

[0010]

[Action] The radius of the circle to be drawn is from the 0 position on the scale.
If it is equal to the distance to the tip of the writing implement , specify the origin.
While aligning the origin of the writing tool with the 0 scale, aligning the origin of the writing tool with the center of the paper and pressing and fixing the writing tool, insert the tip of the writing tool into the writing tool tip insertion section corresponding to the radius of the circle. Then, move the writing utensil together with the flat plate to draw a circle. If the radius of the circle to be drawn is an intermediate length between the insertion points of the writing implement , set the origin of the origin indicator to the radius of the circle.
Origin position equivalent to the difference between the writing tool tip insertion part and the radius
Draw a circle in the same manner as above , according to the alignment scale .

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, the compass 1 has a flat plate 2 made of a transparent resin such as acrylic and formed in a straight line with one side in the longitudinal direction being semicircular and the other three sides orthogonal to each other.

5 mm on one side 6 along the longitudinal direction of the flat plate 2
A length scale 3 is displayed at intervals, and a notch 4 is provided at the edge of the one side 6 as a writing tool tip insertion portion corresponding to each length scale 3.
Are formed, and a small hole 5 is formed at the inner end of each length scale 3 as a writing tool tip insertion portion. Note that the notch 4 can be omitted. As shown in FIG. 2, the flat plate 2 has a long, preferably oval guide hole 7 along one side 6, and the semicircle at one end thereof faces the zero scale of the length scale 3. Position, scale 3 on the other end
The hole is formed so as to extend in the minus direction and to be aligned with the small holes 5. The guide hole 7 has a length that is 1 mm shorter than the distance between the small holes 5, that is, 4 mm, in which the distance between the center of the semicircle on the one end side and the center of the semicircle on the other end is set. An annular origin indicating tool 8 is fitted rotatably and movably along the long axis of the guide hole 7.

The origin indicating tool 8 is a dove whose back surface is uneven in the circumferential direction.
It consists of metal fittings, and the back of the origin indicating tool 8 is in contact with the paper.
When the friction is increased, as shown in FIG.
The origin indicator 8 is attached so as to sandwich the flat plate 2.
You. Also, as shown in FIG.
The light plate 20 is fitted, and the two
The origin 22 is displayed as a point. You in this way
, The position of the origin 22 becomes clear and drawn on paper.
The origin 22 can be precisely aligned with the center of the circle
The origin 22 is set to the zero scale of the length scale 3 or described later.
Move the origin indicator 8 to the origin position adjustment scale 15
You can also check the momentum.

Further, a transparent indicating plate 11 extending in a direction intersecting with the length scale 3 is integrally provided so as to overlap the front surface or the back surface of the flat plate 2. An intermediate portion of the indicating plate 11 is pivotally connected to the flat plate 2 by a pin 9, and an origin indicating device 8 is provided.
Moves along the long axis of the guide hole 7, the tip of the indicating plate 11 makes a circular motion about the pin 9,
An insertion hole 12 into which the tip of the indicating plate 11 is inserted into the flat plate 2 is formed along an arc centered on the pin 9. Furthermore, the origin 22 of the origin indicating tool 8 is
The index 13 indicating the position is displayed on a straight line passing through the origin 22.
You. In addition , the fine adjustment scale 14 is set along the trajectory of the tip of the indicating plate 11 when the origin indicating tool 8 moves to the side edge of the insertion hole 12.
Is displayed.

The fine adjustment scale 14 is displayed at the position indicated by the index 13 each time the origin indicating tool 8 moves by 1 mm. That is, as shown in FIG. 2, when the origin indicating tool 8 is located at the one end side of the guide hole 7 and the origin 22 coincides with 0 of the length scale 3, the index 13 indicates the fine adjustment scale 14. When the origin indicating tool 8 is located at the other end of the guide hole 7 and the origin 22 has moved 4 mm in the minus direction from the length scale 3 as shown in FIG. 4 of the adjustment scale 14 is shown. In addition, along the side edge of the guide hole 7, the origin indicating tool 8 extends from the position of 0 on the length scale 3 to minus 4 mm at intervals of 1 mm in the minus direction.
The origin position adjustment scale 15 indicating the movement amount of the origin 22 is displayed.

The flat plate 2 has a plurality of circular holes 1 having different diameters.
6 are provided, and graduations 17 at 1 mm intervals are displayed on the side opposite to the one side 6, and a numerical hole 18 indicating the length of the graduation is displayed per 1 cm of the graduation through the flat plate 2. The compass 1 can be used both as a ruler and as a template for drawing numbers and circles. An angle scale 1 is provided on the semicircular side of the flat plate 2.
9 is displayed, and the compass 1 can be used as a protractor. Further, if necessary, the flat plate 2 may be provided with holes in the shape of an alphabet or other various shapes.

The compass 1 is used as follows. When the radius of the circle to be drawn is equal to the distance from the zero position of the length scale 3 to any of the small holes 5, the origin indicating tool 8 is fitted to one end of the guide hole 7 and the origin 22 is set. The zero of the length scale 3 is made coincident, and the origin 22 of the origin indicator 8 is made coincident with the center of the circle to be drawn on the paper, as shown in FIG.
As shown in the figure, the origin indicating tool 8 is pressed and fixed with a finger, the tip of the writing tool 10 is inserted into the small hole 5 at a distance corresponding to the radius of the circle, and the writing tool 10 is moved together with the flat plate 2 to form a circle. Draw.

When the radius of the circle to be drawn is an intermediate length between the small holes 5, the minute diameter corresponding to the difference between the radius of the small hole 5 closest to the radius of the circle to be drawn on the inner ring and the radius is small. The adjustment scale 14 and the origin position adjustment scale 15 are
The origin indicating tool 8 is moved to the position indicated by the origin 22, and the writing implement 10 is inserted into the closest small hole 5 to draw a circle in the same manner as described above. If the circle does not need to have an accurate radius, insert the tip of the writing implement into the notch 4 and
A circle can be drawn by moving 0 toward the back side of the notch 4.

FIG. 7 shows a second embodiment. As in the first embodiment, a transparent plate 20b is fitted inside an origin indicating tool 8b, and a hole formed in the center of the transparent plate 20b is formed. Origin 2
2b is displayed. In this way, long-term use
However, the origin 22b may disappear due to friction with the finger, etc.
Absent. In the second embodiment, other configurations and methods of use are almost the same as those of the first embodiment, and thus description thereof is omitted.

[0018]

Since the compass of the present invention does not have a needle, there is no danger of sticking a hand, and it is convenient to handle and carry. Even if you draw multiple concentric circles around, the paper will not be damaged,
Circles can also be drawn on hard materials that do not stick with needles. In addition, by simply inserting the tip of the writing instrument into the tip of the applicable writing instrument, you can easily draw a circle with a desired radius without measuring the distance with a ruler, and there is no need for a ruler. Therefore, it is easy to carry around.

Furthermore, the distance between the origin and the insertion portion of the writing tool tip can be easily and accurately adjusted by moving the origin indicating tool and aligning the origin of the origin indicating tool with the origin position adjusting scale.
Since can be finely adjusted, it is possible to draw even a circle having a radius of intermediate length between the writing instrument distal end insertion portion, the fine adjustment quickly and easily if to point to the fine adjustment scale indicative It can be carried out. In addition, see through the origin indicator.
Along with fitting the plate, the origin is displayed at the center
Therefore, even if the display position of the origin is
There is no risk of deviation, and the center of the paper is passed through the transparent plate
Can be checked, and therefore,
Align the origin and set the position of the origin indicator accurately.
It is possible to

[Brief description of the drawings]

FIG. 1 is an overall plan view of a compass showing a first embodiment of the present invention.

FIG. 2 is a plan view of a main part when fine adjustment of the origin indicating tool is not performed.

FIG. 3 is a sectional view of a main part of the above.

FIG. 4 is a plan view of a main part when the origin indicating tool is finely adjusted.

FIG. 5 is a plan view illustrating a method of using the compass of the present invention.

FIG. 6 is a plan view of a main part of a compass showing the first embodiment of the present invention.

FIG. 7 is a plan view of a main part of a compass showing a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Compass 2 Flat plate 3 Length scale 4 Notch 5 Small hole 6 One side 7 Guide hole 8, 8b Origin indicating tool 9 Pin 10 Writing tool 11 Indicator plate 12 Insertion hole 13 Index 14 Fine adjustment graduation 15 Origin position adjustment graduation 16 Circular hole 17 graduation 18 Numeral hole 19 Angle scale 20, 20b Transparent plate 21, 21 'Diameter 22, 22b Origin

Claims (4)

(57) [Claims] 1. A length scale is displayed on one side of a flat plate, a writing tool tip insertion portion is formed corresponding to the length scale, and a long guide hole is formed at a position facing the zero scale of the length scale. Drilling the flat plate along the length scale, fitting an annular origin indicator in the guide hole slidably and slidably , and fitting a transparent plate inside the origin indicator. ,
The origin is displayed at the center of the transparent plate, and along the side edge of the guide hole.
Indicating the moving distance of the origin starting from the 0 scale
A compass characterized by displaying a point position adjustment scale . 2. An indicator plate extending in a direction intersecting with the length scale is integrally attached to the origin indicator, and a fine adjustment scale is displayed along a trajectory of a tip portion of the indicator plate. The compass according to claim 1, wherein the compass is pivotally attached to a flat plate between the guide hole and the fine adjustment scale, and an indicator is provided at a tip portion of the indicating plate. 3. The compass according to claim 1, wherein the origin is displayed at the center of the transparent plate as an intersection of the two diameters. 4. The compass according to claim 1, wherein the origin is displayed as a hole formed in the center of the transparent plate.