WO2016117649A1

WO2016117649A1 - Drum

Info

Publication number: WO2016117649A1
Application number: PCT/JP2016/051719
Authority: WO
Inventors: 栄藏中田; 学森岡; 孝割石; 俊作辻
Original assignee: 株式会社サカエリズム楽器
Priority date: 2015-01-21
Filing date: 2016-01-21
Publication date: 2016-07-28
Also published as: JP2016133724A

Abstract

[Problem] To provide, at low cost, a drum having excellent durability and excellent acoustic characteristics and comprising a drum body having a plurality of split plates that are connected at the side edges thereof and are arranged side by side. [Solution] A plurality of split plates 2 comprising compressed wood material compressed to a specific gravity of at least 0.5 are connected by the side edges 20 thereof and arranged side by side, a polygon cylinder is constituted, the inner and outer peripheral surfaces are machined, and a cylindrical drum body 1 is formed. Ideally, the specific gravity of the compressed wood material is at least 0.8. The drum body 1 is manufactured such that the split plates 2 constitute a cylindrical body having a regular polygon shape in the planar view and the inner and outer peripheral surfaces thereof are machined and formed into a cylinder. Ideally, the wood material is timber from thinned forests or is young thinned wood.

Description

drum

The present invention relates to a drum that forms a cylindrical drum body by connecting a plurality of divided plates by connecting them at side end portions.

For example, a drum drum obtained by bending a wood plate into a cylindrical shape is used as a conventional drum. As the material wood, high specific gravity wood having excellent vibration characteristics such as rosewood and Bubinga is preferred, but these materials are becoming difficult to obtain as rare wood and are expensive. Accordingly, a laminated plywood obtained by laminating a low specific gravity plate and a high specific gravity plate is used as the plate material that is bent into a cylindrical shape (see, for example, Patent Document 1).

In addition, since the drum cylinder that is bent into a cylindrical shape in this way takes a long time to manufacture, as a drum cylinder that can be manufactured more easily, for example, by cutting the both side edges of the dividing plate diagonally over the entire length in the longitudinal direction, Has been proposed in which a drum body is formed by forming a plurality of cylinder forming laminates and joining a plurality of cylinder forming divided plates in the width direction (see Patent Document 2).

For this divided plate, rare wood having excellent acoustic characteristics is also preferred. However, when a laminated material is used as the dividing plate for the same reason as described above, there is a concern that the strength may be reduced due to aging as compared with a case where the material is bent into a cylindrical shape.

JP 2009-163112 A JP 2008-225087 A

Therefore, in view of the above-described situation, the present invention is to solve a drum composed of a drum body continuously connected by connecting a plurality of divided plates at side end portions, and having excellent durability and acoustic characteristics. It is in providing at low cost.

As a result of diligent study to solve the above-mentioned problems, the present inventor, instead of using rare wood with high specific gravity, uses compressed wood in which non-rare wood such as cypress is compressed to increase the specific gravity, thereby stacking layers. The present inventors have found that the drum can be reduced in cost, excellent in acoustic characteristics, and excellent in durability without using a material, and the present invention has been completed.

That is, the present invention is a drum configured to form a cylindrical drum body by connecting a plurality of divided plates at side end portions, and the divided plate has a specific gravity of 0.5 by compressing wood. A drum comprising the above compressed wood is provided.

Here, it is preferable that the compressed wood has a specific gravity of 0.8 or more.

In addition, the drum body includes a plurality of flat plate-like divided plates to form a regular polygonal cylindrical body in plan view, and a cylindrical cylinder in plan view by cutting an outer peripheral surface and an inner peripheral surface of the cylindrical body. It is preferable to process each of the shape surfaces.

Furthermore, it is preferable that the timber is a thinned wood or a fast-growing tree.

Since the drum according to the present invention configured as described above has a drum body made of compressed wood having a specific gravity of 0.5 or more obtained by compressing wood as a divided plate, compared to the conventional one that is bent into a cylindrical shape. In addition to excellent manufacturing efficiency, it has the same excellent acoustic characteristics as rare wood, is cheaper than rare wood, does not need to be a laminated material, has no risk of strength deterioration due to aging, and is durable It is possible to provide a drum with excellent performance and acoustic characteristics at low cost.

Also, since the specific gravity is 0.5 or more by compression processing, the rise in vibration characteristics is quick and the body is easy to use musically. By using compressed wood in this way, it can be used as a substitute for rare wood that is being exhausted worldwide. By using a material that has been compressed to a specific gravity of 0.8 or more, it is possible to provide more excellent acoustic characteristics.

In addition, the drum body is configured by connecting a plurality of flat plate-like divided plates to form a cylindrical body having a regular polygon in plan view, and cutting the outer peripheral surface and the inner peripheral surface of the cylindrical body to obtain a cylindrical shape in plan view. Since each of the surfaces is processed, the remaining plate has less residual stress compared to the case where the divided plate is made by bending and maintains a stable shape for a long period of time. However, the distribution of the compression state of the internal tissue greatly changes, but the internal tissue can also maintain the state during compression processing, and the quality such as acoustic characteristics can be stabilized.

In addition, low-priced thinned wood and fast-growing trees such as cedar and cypress can be used, which can contribute to the protection of rare timber.

The perspective view which shows the drum trunk | drum of the drum which concerns on this invention. The perspective view which similarly shows the division board which comprises a drum cylinder. The perspective view which shows the polygonal cylindrical body which provided the division board continuously. The top view explaining similarly cutting the inner peripheral surface of a cylindrical body. The perspective view which shows the cylindrical body which cut the cylindrical body similarly. The perspective view which shows the modification of a division board. The perspective view which shows the cylindrical body which connected the division plate of the modification similarly. Graph showing acoustic characteristics of Example 1 Graph showing acoustic characteristics of Example 2 Graph showing acoustic characteristics of Comparative Example 1

DESCRIPTION OF SYMBOLS 1 Drum trunk | drum 2 Dividing plate 3 Cylindrical body 4 Cylindrical body 5 Connection board 20 Side edge part 21 Groove groove 22 Groove groove 23 Convex part 30 Outer peripheral surface 31 Inner peripheral surface 40 Opening end

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the drum of the present invention includes a plurality of divided plates 2 made of compressed wood compressed to a specific gravity of 0.5 or more, connected by side end portions 20, and a cylindrical drum body. 1 is constructed.

As shown in FIG. 2, each divided plate 2 is formed by processing left and right side end portions 20 into a tapered surface from flat compressed wood, and the tapered surface of each side end portion 20 has a central portion. A concave groove 21 extending in the vertical direction is formed in the upper and lower sides. This concave groove 21 is a groove for fitting and firmly connecting the connecting plate 5 when the side end portions 20 are connected to each other. Of course, other forms may be used.

The wood used for the split plate 2 can effectively utilize thinned wood or early-growing trees with small specific gravity such as cedar and cypress. However, the present invention is not limited to this, and other wood can be widely used, and includes use as a compressed wood having a higher specific gravity by compression processing using wood having a specific gravity of 0.5 or more.

For the compression processing, a known processing method can be used in which wood is softened by heating with high-frequency electromagnetic waves or the like or by absorbing moisture in a high-temperature and high-pressure steam atmosphere. For example, JP 2003-53705 A can be used. The consolidation and fixing method described in the publication is suitable.

The specific gravity of the divided plate 2 made of compressed wood is 0.5 or more, and the rise in vibration characteristics is quick, and the body is easy to use musically like rare wood. If specific gravity is 0.8 or more, it is more preferable at the point which becomes remarkably good regarding an acoustic effect.

These divided plates 2 are connected to each other at the side ends 20 with an adhesive using a connecting plate 5 fitted in the concave groove 21 to form a cylindrical body 3 having a regular polygonal shape as shown in FIG. . As a configuration other than the connection between the groove 21 and the connecting plate 5, for example, a similar groove in the vertical direction is provided at one side end facing each other, and a protrusion that fits into the other side end is provided. Also good. Further, a structure in which a plurality of projections and depressions are continuous along the longitudinal direction of the side end portion is also preferable in terms of enhancing the connection strength with respect to the drum cylinder axis direction.

In this case, for example, as shown in FIG. 6 and FIG. 7, a plurality of concave grooves 22 that are opened only on the inner surface side are formed in one side end portion along the vertical direction, and the other side end portion is It is preferable that a plurality of convex portions 23 fitted in the respective concave grooves 22 are formed along the vertical direction at positions corresponding thereto. According to this, it is possible to maintain the connection strength in the radial direction of the drum body, and it is possible to provide a preferable appearance in terms of appearance without the appearance of irregularities on the outer surface side. In this example, the groove shape is a dovetail shape in the longitudinal section, and the connection strength is further increased.

In addition, the fitting structure of the dividing plate may of course have other shapes, and such a fitting structure can be omitted.

Then, as shown by the phantom line in FIG. 4, the outer peripheral surface 30 and the inner peripheral surface 31 of the cylindrical body 3 are cut and processed into a cylindrical surface in plan view, thereby forming the cylindrical body 4 shown in FIG. Further, the upper and lower

open end portions

40, 41 of the cylindrical body 4 are cut into a taper shape so that the axial length becomes shorter toward the center side, whereby the drum body 1 having the structure shown in FIG. The

A drum using such a drum cylinder is provided, for example, such that an upper drum head and a lower drum head covering the upper and lower opening end surfaces of the drum cylinder 1 close both end surfaces of the cylinder main body via a hoop. A plurality of head adjusting devices for adjusting the tension are provided at equiangular intervals so as to connect the upper hoop and the lower hoop, and further, a plurality of head adjusting devices are provided by a strainer device provided at a position opposed to the body main body by 180 °. It can be configured as a snare drum in which a snappy composed of a snappy wire is held so as to be switched so as to be in contact / non-contact with the lower drum head. Of course, other drums may be configured.

As mentioned above, although embodiment of this invention was described, this invention is not limited to such an Example at all, for example, a division | segmentation board is assembled | attached by flat form and a polygonal cylinder is not comprised, but each division | segmentation is comprised. Needless to say, the present invention can be implemented in various forms without departing from the gist of the present invention, such as a cylindrical body obtained by assembling the plates after being rolled.

Hereinafter, the results of measuring the peak frequency of each test piece (Example 1, Example 2, Comparative Example 1) of hinoki material when an impact is applied will be described.

(sample)
In the test piece of Example 1, the dried cypress material was compressed 30% by the heating and compression consolidation method described in JP-A-2003-53705 (compressed until the volume reached 70% before processing). Processed compressed wood. The specific gravity is 0.586.

The test piece of Example 2 is a compressed wood obtained by compressing 50% of the same dried cypress wood by the same method as in Example 1. The specific gravity is 0.82.

The test piece of Comparative Example 1 is a cypress material that has been dried and used as it is without being compressed. The specific gravity is 0.41.

The dimensions of the test piece were set to the same length of 305 mm, width of 75 mm, and thickness of 14 mm in both Examples 1 and 2 and Comparative Example 1.

(Frequency measurement test)
For frequency measurement, using the handle part (rubber part) of the driver, the recording level is not distorted at the center position in the horizontal direction of the widest front (rear) surface of the test piece and 1/4 position from the vertical end. I adjusted it to a certain level and struck it (I recorded it at a slightly small level because 0 dBu was distorted). Each of the three types of Examples 1 and 2 and Comparative Example 1 was re-struck several times so that the recording level was the same. The recording microphone was installed at a position about 30 cm away.

For recording and frequency measurement software, “Cool Edit 2000” manufactured by Syntrilium, which operates on a Windows (registered trademark) OS, was used. As the audio interface, “UR22” manufactured by Steinberg was used. The microphone used was “ECM8000” manufactured by Behringer.

(Measurement result)
The results are shown in FIGS. 8 to 10 and Table 1 below.

As can be seen from FIGS. 8 to 10 and Table 1, the higher the specific gravity, the higher the peak frequency and the better the acoustic effect of the drum using the divided plate made of compressed wood of the test piece.

Claims

A drum formed by connecting a plurality of divided plates at side end portions to form a cylindrical drum body,
A drum characterized in that the divided plate is made of compressed wood having a specific gravity of 0.5 or more obtained by compressing wood.
The drum according to claim 1, wherein the specific gravity of the compressed wood is 0.8 or more.
The drum cylinder is configured by forming a plurality of flat plate-like divided plates to form a regular polygonal cylindrical body in plan view, and cutting the outer peripheral surface and inner peripheral surface of the cylindrical body to obtain a cylindrical shape in plan view. The drum according to claim 1 or 2, wherein each surface is processed.
The drum according to any one of claims 1 to 3, wherein the wood is thinned wood or fast-growing trees.