JP7611546B2 - Educational Tuning Fork Experiment Device - Google Patents

Description

Article 30, paragraph 2 of the Patent Act applies. Nara Prefecture Spring Training Workshop Branch Meeting held on February 15, 2020 (sponsored by Uchida Yoko Co., Ltd., held at 2-2-2 Izumicho, Chuo-ku, Osaka City, Osaka Prefecture, Uchida Yoko Co., Ltd. Osaka Branch) Issued on April 1, 2020 by Uchida Yoko Co., Ltd. Uchida Science Laboratory Equipment Select Catalog

The present invention relates to an educational tuning fork experiment device for science classes that allows students to learn about the properties of sound through experiments.

In science classes, students sometimes learn about the properties of sound through experiments. Tuning forks are used in these experiments to learn about how sound travels and how it resonates with other objects. A tuning fork is a long, thin piece of steel bent into a U-shape with a rod-shaped steel handle attached to the center. In addition to its educational uses, tuning forks are also used as a standard sound source for tuning musical instruments. A tuning fork vibrates at a specific frequency when the U-shaped part is struck, but in this state the sound is too quiet to be heard by the ear, so it is common to make the rod-shaped part of the tuning fork contact the resonating body or soundboard of a musical instrument to amplify the sound and use it as a standard sound source. In science experiments, tuning forks with a resonating box are used. A resonating box is a box attached to the bottom (handle) of a tuning fork in order to generate a louder sound through resonance. One side of this box is open, from which the sound comes out.

A tuning fork mounting part is attached to the top surface of the resonance box, and the tuning fork is attached to the resonance box by inserting the handle of the tuning fork into a relatively deep mounting hole provided there. When attached, the bottom end of the tuning fork is in contact with the top surface of the resonance box. This transmits the vibrations of the tuning fork to the resonance box, and the resonant sound reaches the listener.

Utility Model Registration No. 3093634 "Tuning fork structure"

Traditionally, the resonating boxes of tuning forks were made of wood. However, wooden resonating boxes have the problem of being expensive. In addition, the number of manufacturers is decreasing, making them difficult to obtain.

If the material of the resonance box is to be changed to metal, etc., a new method of attaching the tuning fork must be developed. Conventionally, both the resonance box and the tuning fork attachment part were made of wood, and the two were joined together, and after the tuning fork attachment part was attached, the handle of the tuning fork was inserted into it to complete the tuning fork with resonance box.

This invention was made to solve the above problems, and aims to provide an educational tuning fork experiment device that has a metallic resonator, is readily available, is low cost, and is easy to assemble.

The present invention relates to a tuning fork experimental device having a vibration part including a U-shaped part and a resonance part that resonates with the vibration of the vibration part,
The lower part of the U-shaped portion is formed into a rod shape,
The resonator is made of metal and has an opening on the top surface.
The rod-shaped portion is inserted into the opening of the resonance portion and fixed thereto.

A male thread is formed in the rod-shaped portion, and a female thread is formed in the opening,
a fastening member having a fixing portion having a through hole for receiving the rod-shaped portion, and a female thread portion for engaging with the male thread portion,
The fastening member is moved to the U-shaped portion while engaging with the male thread portion;
The rod-shaped portion is passed through the through hole of the fixing portion,
Engaging the male threads with the female threads of the opening;
The U -shaped portion may be fixed by moving the fastening member toward the fixing portion while the lower portion of the U-shaped portion faces the resonating portion . (Forming a female thread in the opening includes fixing a nut or the like to the inside of the resonating portion.)

FIG. 1 is a perspective view of an educational tuning fork experiment device according to an embodiment of the present invention. FIG. 2(a) is a cross-sectional view of a tuning fork experimental device according to an embodiment of the invention (showing the state in which the resonating part is cut in the long side direction; cross-sectional view taken along the line A-A in FIG. 2(b)), and FIG. 2(b) is a left side view. FIG. 3(a) is a rear view of a tuning fork experimental device according to an embodiment of the invention, and FIG. 3(b) is a cross-sectional view (showing the state in which the resonating part is cut in the short side direction; cross-sectional view taken along the line B-B in FIG. 3(a)). FIG. 1 is a front view of a tuning fork experimental device according to an embodiment of the present invention. FIG. 2 is a right side view of the tuning fork experimental device according to the embodiment of the present invention. FIG. 1 is a plan view of a tuning fork experimental device according to an embodiment of the present invention. FIG. 2 is a bottom view of the tuning fork experimental device according to the embodiment of the invention.

The following describes the embodiment of the invention with reference to the drawings.

FIG. 1 is a perspective view of an educational tuning fork experiment device according to an embodiment of the present invention.
FIG. 2(a) is a cross-sectional view showing the tuning fork experimental device of FIG. 1 cut along a line passing through the center of the vibrating part 1 along the longitudinal direction of the resonating part 2. FIG.
FIG. 3B is a cross-sectional view showing a state cut at a right angle to the cutting line in FIG.
Figures 2(b), 3(a) and 4 to 7 are six-sided views of the tuning fork experimental device, in which reference numerals are omitted.

This educational tuning fork experiment device is comprised of a vibrating part 1 with a U-shaped part 11, a resonating part 2 that is provided below the vibrating part 1 and resonates the vibration to amplify the sound, a cylindrical fixing part 3 provided between the vibrating part 1 and the resonating part 2, and a nut (fastening member) 4 that is provided between the U-shaped part 11 and the fixing part 3 and fixes the vibrating part 1 in any direction (for example, in a direction in which the U-shape faces the front (rear) as shown in the figure). The resonating part 2 is roughly in the shape of a square pipe, with one end A open and the other end B closed.

The vibration part 1 that produces the sound consists of a U-shaped part 11, a joint 12 between the U-shaped part 11 and the male threaded part 13, and the male threaded part (corresponding to a rod-shaped part or handle) 13. These are either produced as a single unit or assembled by joining separate parts together. The U-shaped part 11 is made by bending a single elongated steel into a U shape. The upper end of the male threaded part 13 is fitted into the joint 12. The male threaded part 13 is attached downward to the center of the lower part of the U-shaped part 11. The male threaded part 13 is a rod-shaped member that extends from the lower part of the joint 12 to the opposite side to the U-shaped part 11, and has a male thread on its surface. The nut (fastening member) 4 for attaching the vibration part 1 to the resonance part 2 is inserted from the lower end of the male threaded part 13 and rotated until it moves close to the U-shaped part 11. In the illustrated example, the nut (fastening member) 4 is positioned near the upper end of the male threaded portion 13, immediately adjacent to the U-shaped portion 11. In this state, the male threaded portion 13 passes through a through hole 31 provided in the center of the fixed portion 3. Its tip protrudes from the fixed portion 3. The male threaded portion 13 engages with the upper opening (female threaded portion) 23 of the resonating portion 2 after passing through the through hole 31 of the fixed portion 3. In the illustrated example, the tip of the male threaded portion 13 protrudes to the inner surface of the resonating portion 2. The fixed portion 3 is fastened with the nut (fastening member) 4. The fixed portion 3 is sandwiched between the lower end of the nut 4 and the upper surface of the resonating portion 2. This fixes the vibrating portion 1. This configuration makes it easy to attach the vibrating portion 1.

The resonating part 2 consists of a metal body 21, which is a square pipe-shaped part, and a metal end surface 22 that is attached to the closed end I. An upper surface opening 23 that receives the male threaded part 13 is provided in the center of the upper surface. Four rubber feet 24 are provided on the lower surface. The metal body 21 is made, for example, from an aluminum square pipe. The metal end surface 22 is the same type of metal plate as the metal body 21, for example an aluminum plate. The fixed part 3 is, for example, a wooden member, and has the shape of a rotating body such as a cylinder. A through hole 31 larger in diameter than the male threaded part 13 is provided in the center.

The educational tuning fork experiment device according to the embodiment of the invention has a resonating part made of metal (aluminum), so it is thinner and harder than wood. The harder the material the resonating part is made of, the longer it will resonate. Also, because it is made of metal and precision is possible, a tuning fork experiment device with better resonation has been realized. The vibrating part 1 and the resonating part 2 are attached using nuts (fastening members) 4, and the vibrating part 1 is fixed to the resonating part 2, so the vibrating part 1 and the resonating part 2 are connected to each other, and the vibration of the tuning fork can be transmitted to the resonating part more effectively than if the resonating part was made of wood.

In addition, compared to wooden structures, they are less expensive and more readily available. They are also easier to assemble.

The fixed part 3 is fastened with a nut (fastening member) 4, so the vibrating part 1 can be fixed in any orientation.

When fixing the vibration part 1 to the resonance part 2, it is often necessary to attach the vibration part 1 so that it faces forward (so that the U-shaped side faces forward) with respect to the long side of the resonance part 2. If the nut (fastening member) 4 is not provided, the vibration part 1 will not necessarily be fixed in the desired orientation (described later). In contrast, according to an embodiment of the invention, the vibration part 1 can be fixed in the desired orientation by inserting it into the top opening 23 and turning it to the desired position (where the U-shaped side faces forward), and then turning the nut (fastening member) 4 to fix it.

One method of fixing the vibrating part 1 is to create a hook fixed to the vibrating part 1 and fix it from the inside of the resonating part 2 with a nut. However, with this method, the inside of the resonating part 2 is small, so the nut cannot be attached by hand. There is a problem in that a special tool is required. According to the embodiment of the invention, such a problem does not occur.

It is also possible to fix a nut to the inside of the resonating part 2, or to cut a female thread into the opening 23, but in this case the male threaded part 13 would have to be tightened until the vibrating part 1 was firmly fixed, but this would mean that the vibrating part 1 could not be fixed in any orientation (the vibrating part 1 would not necessarily face forward when tightened). According to the embodiment of the invention, such a problem does not arise.

The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the invention described in the claims, and it goes without saying that these modifications are also included within the scope of the present invention.

1. Vibrating part (tuning fork)
11 U-shaped part (arm)
12 Junction between U-shaped portion and male thread portion 13 Male thread portion (rod-shaped portion)
2 Resonating portion 21 Metal body 22 Metal end surface 23 Top opening (female thread portion)
24 Rubber foot 3 Fixing portion 31 Through hole 4 Nut (fastening member)
A Open end B Closed end

Claims (2)

A tuning fork experimental device having a vibration part including a U-shaped part and a resonance part that resonates with the vibration of the vibration part,
The lower part of the U-shaped portion is formed into a rod shape,
The resonator is made of metal and has an opening on the top surface.
An educational tuning fork experiment device, characterized in that the rod-shaped portion is inserted into and fixed in the opening of the resonating portion. A male thread is formed in the rod-shaped portion, and a female thread is formed in the opening,
a fastening member having a fixing portion having a through hole for receiving the rod-shaped portion, and a female thread portion for engaging with the male thread portion,
The fastening member is moved to the U-shaped portion while engaging with the male thread portion;
The rod-shaped portion is passed through the through hole of the fixing portion,
Engaging the male threads with the female threads of the opening;
2. An educational tuning fork experiment device as described in claim 1, characterized in that the U-shaped portion is fixed by moving the fastening member toward the fixing portion with the lower side of the U-shaped portion facing the resonating portion .

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