JPS5839511Y2 - plastic beetle - Google Patents

Description

[Detailed explanation of the invention] Since each traditional bamboo shakuhachi has different properties, pipe thickness, pipe cross-sectional shape, etc., the majority of the production process involves preparing the internal cross-sectional shape of the shakuhachi. Moreover, it was a difficult technique that relied on experience and intuition.

This has hindered the uniformity of quality and made products expensive.

Furthermore, the wooden shakuhachi that has been attempted in recent years requires lathe processing to process the inside of the pipe, making it difficult to work with.

Furthermore, since wood has a low elastic modulus and hardness, the resonance of the air column is poor and good quality tone cannot be produced.

Furthermore, plastic shakuhachi, which has also been attempted in recent years, still requires machining for the inner surface, but machining a long, tapered hole with a small inner diameter is a difficult task.

On the other hand, if it is attempted to mold this at high temperature and high pressure, there are many financial and technical problems, such as the high manufacturing cost of the mold and the shrinkage of the tube cross section after cooling.

The purpose of this invention is to provide an inexpensive plastic shakuhachi that has the same tone as a well-tuned bamboo shakuhachi, is easy to manufacture, has uniform accuracy, and has uniform quality. be.

The square shakuhachi of this invention made from a plastic plate has the same resonance characteristics of the air column, including the elastic properties of the pipe wall, as those of round bamboo, so it can produce the same tone and volume as the bamboo shakuhachi. It is something that occurs.

An embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, numeral 1 is a linearly tapered tapered convergence pipe from the mouth A to the constricted part B, and 2 is a linearly tapered expanding pipe from the constricted part B to the end C of the pipe.

3 is a reinforcing material for the hand hole on the front side, and 4 is a reinforcing material for the hand hole on the back side.

FIG. 2 is a cross-sectional view of these parts.

This hand hole part is narrow in width and somewhat chevron-shaped, making it thicker so that it will be easier to touch and cut with the fingers, and to prevent it from breaking when drilling the hand hole.

5 is the mouthpiece reinforcement material. Since the mouthpiece is the part that touches the mouth, it is better to make it thicker by placing one or two plates on the four sides for a better mouthfeel.

To make it even more palatable, the inner surface is filed down to make it slightly rounder.

In addition, especially on the front surface where the mouth edge is provided, the edge surface requires a certain length, so it is necessary to attach such a reinforcing material to increase the thickness.

As for the material, it is preferable to use a transparent acrylic plate with a thickness of 2 to 3 mm so that it can be easily cut.

Enbi-based plastic plates may also be used, but Acnor has better resonance and better tone due to its mechanical properties.

Because it is a thin plate that is easy to work with, and because all the board cutting is straight, it is easy to obtain dimensional accuracy.

It has many advantages in terms of construction, such as the small number of parts and the ability to assemble it easily using adhesives.

In addition, since the tube is made of a predetermined thickness, the thickness of the tube at the hand hole part is the same for all shakuhachis, and all you need to do is drill the hand hole at a predetermined position. There is no need to modify the diameter or position.

In addition, with bamboo shakuhachi, ivory or buffalo horn is inserted into the mouthpiece edge, but if the material is acrylic or the like, it is not necessary to insert these because it has its own strength and hardness.

Therefore, it is possible to provide a plastic shakuhachi that is easy to work with, is inexpensive, has constant quality, and has the same tone as a bamboo shakuhachi.

The cross-sectional area of the twill section is based on a well-tuned bamboo shakuhachi, but the cross-sectional shape is the same from the mouthpiece to the end, such as a square if it is square or a rectangle if it is rectangular. It's better.

Also, the cross-sectional shape does not necessarily have to be square, and the tapered tube does not need to be made in two pieces as in this example, but in order to reduce the number of plates as parts and shorten the manufacturing process, As in this embodiment, it is easiest to make it from two tapered tubes with a square cross section.

[Brief explanation of the drawing]

FIG. 1 is an overall view of the present invention, and FIG. 2 is a view taken along arrow D in FIG. 1... Gradual taper tube body, 2... Expanding taper tube body, 3, 4... Hand hole reinforcement material, 5
・・・・・・Utator mouth reinforcement material.

Claims (1)

[Scope of utility model registration request] A square shakuhachi made of plastic, consisting of two or more tapered tubes with a square internal cross-sectional shape, with the joint serving as a constriction part.