JPH0444395Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a ruler that not only functions as a regular ruler for measuring length, but also functions as a circular ruler for drawing circles and ellipses.

[Conventional technology]

Conventionally, a large circular window hole is provided in the center of a triangular ruler, and a rotating disk for drawing a circle is removably and rotatably fitted into the hole. In addition to providing multiple small holes at regular intervals in the radial direction for inserting the
A rotary disk is provided with a plurality of large circular holes of different sizes and a minute scale marked on the outer periphery of the rotating disk.

[Problems to be solved by the invention] However, with this conventional device, it is not possible to draw an ellipse, and there are multiple small parts for inserting the tip of the writing instrument into the rotating disk and rotating the rotating disk. In addition to the holes, there are multiple large circular holes of different sizes for drawing circles by moving the writing instrument along the periphery, so these circular holes take up the area of the rotating disk, increasing the size of the circle that can be drawn. There weren't many. With this invention, when drawing a circle by inserting the tip of a writing instrument into a small hole and rotating a rotating disk, the radius of the circle that can be drawn can be changed in small increments and in a large number of steps. To provide a multifunctional ruler that does not pose any particular problem on the strength of the rotating disk even if holes are provided in the rotating disk, and can draw ellipses and cycloid curves.

[Means to solve the problem]

In order to achieve such an objective, the ruler according to the present invention has a sliding plate fitted into the frame of the ruler body forming an oblong rectangular frame so as to be slidable left and right, and a large circular window hole of the sliding plate is fitted. A rotary disk is rotatably fitted, and a number of small holes for inserting the tip of a writing instrument are placed on the rotary disk on a plurality of arc-shaped radial curves radiating from the center point of the rotary disk. Moreover, the distances from the center point of the rotating disk are made to be different from each other, and the radiation curves located at different distances are sequentially changed.

[Effect]

By inserting the tip of a writing instrument into any small hole in the rotating disk and rotating the rotating disk while the slide plate is stopped, you can draw a perfect circle of any size, and you can also slide the slide plate at a certain point. After that, you can draw an ellipse by rotating the rotating disk. The small holes used to draw a perfect circle are offset in both the radial and circumferential directions on the same radial curve.
Moreover, the radiation curves located at different distances from the center of the rotating disk are sequentially changed, so
The radial distance between the small holes can be increased on the same radial curve. Furthermore, by sliding the slide plate while rotating the rotary disk, a cycloid curve can be drawn. The main body of the ruler forms an oblong rectangular frame, so it can be used as a regular ruler for drawing straight lines on the four sides and measuring length.

【Example】

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. In FIG. 1, a ruler main body 1 has a horizontally long rectangular frame, and a rectangular slide plate 2 is fitted within the frame so as to be slidable left and right as follows. That is, as shown in FIG. 2, the ruler main body 1 has upper and lower frame plates 1a,
1b are overlapped and fixed to each other with screws 3, etc., and guide grooves 4 are formed on the front inner edge and rear inner edge of the frame. The front edge and the rear edge are slidably fitted. Inside the guide groove 4, a round bar-shaped wire rod 5 made of a metal wire such as a piano wire or a carbon material is arranged in order to smooth the sliding movement of the slide plate 2.
In order to prevent the slide plate 2 from sliding inadvertently, the front and rear sides of the upper frame plate 1a are provided with brake pads that press into shallow grooves 6 on the top surface of the slide plate 2, as shown in FIG. A spring 7 is embedded. This brake spring 7 is inserted into a screw hole 8 provided in the frame plate 1a and is held down from above by a holding screw 9. On the outer edges of the four sides of the ruler body 1, for example, one long side is 1/100m, the other long side is 1/300m, and one short side is 1/100m.
400m, 1/500m length scale 10 on the other short side,
11, 12, and 13 are displayed, respectively. Furthermore, scales 14 are displayed on the front inner edge and the rear inner edge of the ruler body 1 to indicate the sliding position of the slide plate 2. The slide plate 2 has a large circular window hole 15,
A transparent rotary disk 16 is rotatably fitted into the window hole 15 as follows. That is, the slide plate 2 also has upper and lower frame plates 2a and 2b as shown in FIG.
are overlapped and fixed with screws 17 etc., and a whole annular guide groove 1 is formed around the window hole 15 formed by both of them.
8, and the outer peripheral edge of the rotary disk 16 is fitted into this guide groove 18 so as to be rotatable and slidable. Also within this guide groove 18, a round bar-shaped wire rod 19 made of a metal wire such as a piano wire or a carbon material is arranged in order to make the rotation of the rotating disk 16 smooth. Note that a ball may be used instead of the wire 19. In addition, in order to restrict the rotation of the rotating disk 16 at an arbitrary position, countless small teeth 20 are carved on the entire outer periphery of the upper surface of the rotating disk 16, as shown in FIG. A stopper 21 resembling the crown of a clock is installed in the upper frame plate 2a. When the knob 21a of the stopper 21 is pushed in, the claw 21b at the lower end engages with the teeth 20 to restrict the rotation of the rotary disk 16. When the knob 21a is lifted, the claw 21b
1b is disengaged from the tooth 20, and rotation of the rotary disk 16 is allowed. As shown in FIG. 1, the rotating disk 16 has a large number of small circular holes 23 arranged at regular intervals in the radial direction along, for example, five arcuate rays (radial curves) radiating from its center point 22. It is drilled at the same time.
This small hole 23 is for inserting the tip of a writing instrument, and is tapered toward the lower end as shown in FIG. 2 to facilitate insertion. Further, the spacing is, for example, 5 mm in the radial direction for each ray, and 1 mm in the radial direction between the rays. That is, center point 2
If a small hole 23 of 2 to 10 mm is drilled on the first radiation, a small hole 2 of 11 mm from the center point 22 is drilled on the first radiation.
3 is on the second radial line, and the small hole 23, which is 12 mm from the center point 22, is on the third ray, and 13 mm from the center point 22.
The small hole 23 is on the fourth radial line from the center point 22.
A small hole 23 of 14 mm is drilled on the fifth radiation, and similarly, the holes are sequentially bored on the first to fifth radiation at intervals of 1 mm. Further, on the rotating disk 16, a radius scale 24 representing the radius from the center point 22 of the small hole 23 is displayed in a concentric shape. Furthermore, in the free space where there is no small hole 23, a radius of 10 mm is added.
A plurality of circular holes 25 of different sizes are bored to draw the following circles. Therefore, by inserting the tip of a writing instrument into any small hole 23 and rotating the rotating disk 16 with the writing instrument, a piece of any size centered on the center point 22, in this example a radius of 10 mm or more, can be written. It can draw circles in 1mm increments, and is especially useful for drawing concentric circles.
For circles with a radius of 10 mm or less, use any circular hole 25
can be drawn by moving a writing instrument along the periphery of the Further, the rotation of the rotating disk 16 is regulated by the stopper 21, and the tip of a writing instrument is inserted into an arbitrary small hole 23, and after sliding the slider 2 together with the rotating disk 16 to an arbitrary position with the writing instrument, The rotation restriction by the stopper 22 is released, and the rotating disk 16 is moved with a writing instrument inserted into the small hole 23 as described above.
By rotating , you can draw an ellipse of any size. In this case, the straight line part and the arc part of the ellipse can be drawn continuously and neatly. Furthermore, by sliding the slider 2 while rotating the rotary disk 16, a cycloid curve or other curves can be drawn. In this case, rotating disk 1
If an interlocking mechanism is provided to synchronize the rotation of the slider 6 with the sliding of the slider 2, the desired curve can be drawn neatly. A simple straight line can be drawn using the four sides of the ruler body 1. FIGS. 5 and 6 show another example of the present invention, in which a rotating disk 16 is rotatably fitted into an annular holder 26,
The rotating disk 16 is detachably attached to the slider 2 via this holder 26. That is,
A guide groove 27 is provided on the inner circumferential edge of the holder 26, and the outer circumferential edge of the rotary disk 16 is fitted into the guide groove 27 so as to be rotatable and slidable. Rotation is restricted relative to the holder 26. Further, a protruding strip is provided on the outer peripheral edge of the holder 26 over the entire circumference, and this protruding strip 28 is removably fitted into a grooved strip 29 provided on the inner circumferential edge of the window hole 15 of the slide plate 2. Then, rotating disk 16
can be attached to and detached from the slide plate 2 together with the holder 26. In this fitting, the holder 26 is positioned without rotating relative to the window hole 15 by simultaneously fitting the rotation prevention recesses and protrusions on the holder 26 side and the window hole 15 side (not shown). be done. A minute scale 30 is displayed on the upper surface of the holder 26 over its entire circumference. Therefore, if the rotary disk 16 is removed from the slide plate 2 together with the holder 26, the holder 26 can be used as a protractor, and by rotating the rotary disk 16 relative to it, any Can draw a circle with radius.

[Effect of the idea]

The ruler of the present invention has the following effects. A large number of small holes into which the tip of a writing instrument is inserted are provided in the rotating disk at regular intervals in the radial direction along a plurality of rays, so that a large number of circles of different sizes can be drawn. A slide plate is fitted into the frame of the ruler body, which is an oblong rectangular frame, so that it can slide left and right, and a rotary disk is fitted into the large circular window hole of the slide plate, so that it can be easily shaped like an ellipse or a cycloid. You can also draw curved lines. Since the ruler body forms a horizontally long rectangular frame, its four sides can be used as a regular ruler for drawing straight lines and measuring lengths. The small holes used to draw a perfect circle are shifted in both the radial and circumferential directions on the same radial curve, and the radial curves are sequentially positioned at different distances from the center of the rotating disk. Because of this change, the radial distance between the small holes can be increased on the same radiation curve. Therefore, in order to make the radius of the perfect circle drawn in small increments and to increase the size of the perfect circle in small increments, it is necessary to provide a large number of small holes in the rotating disk.
According to the present invention, the small holes are scattered in the radial and circumferential directions of the rotating disk with a predetermined regularity, so a very large number of small holes are provided in the rotating disk. However, there is no problem that the strength of the rotating disk is weakened because of this. That is, there is no case where a large number of small holes are concentrated in a part of the rotating disk and that part is extremely prone to damage.

[Brief explanation of the drawing]

Figures 1 to 4 show one embodiment of the present invention, with Figure 1 being a partly simplified plan view of the whole, Figure 2 being an enlarged sectional view taken along the line - - in Figure 1, and Figure 3 being an enlarged sectional view taken along the line - FIG. 4 is an enlarged sectional view taken along the same line, and FIGS. 5 and 6 are a plan view and an enlarged sectional view of main parts of other examples of the present invention. 1... Ruler body, 2... Slide board, 16...
Rotating disk, 23...small hole.

Claims (1)

[Scope of utility model registration request] A slide plate is fitted into the frame of a ruler body forming an oblong rectangular frame so as to be slidable left and right, and a rotary disk is fitted into a large circular window hole of the slide plate so as to be rotatable. A large number of small holes for inserting the tip of the writing instrument are placed on multiple arc-shaped radial curves radiating from the center point of the rotating disk, and the distance from the center point of the rotating disk is small. A ruler characterized by being provided with radiation curves that are different from each other and are positioned at successively different distances.