JPH0136235Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Field of Application] The present invention relates to a support stand for pianos, percussion instruments, etc., which are played by having a part of the stand in contact with and supported by the floor or the like. [Prior Art] Relatively heavy musical instruments such as pianos and percussion instruments are generally played while being supported on the floor, etc. In this case, when they come into contact with the floor, etc., the specific vibrations of the instrument are quickly transmitted to the floor, etc. Normally, musical instruments have limited contact with the floor, etc., because certain vibrations of the musical instrument are not attenuated in a predetermined manner, or the floor, etc. resonates and distorts the instrument sound. However, if the load of the instrument is applied to a limited area of the floor, etc., the floor is likely to be damaged, so in order to protect this, an instrument support stand is generally used to spread the load of the instrument over a wide area. It is used. As this support stand, the fourth
In addition to wooden supports such as the shape shown in the figure, plastic supports such as the shape shown in FIG. 5, rubber supports such as the shape shown in FIG. 6 are used. [Problem that the invention aims to solve] However, in the case of wooden or plastic supports as shown in Figures 4 and 5, the vibrations of the musical instrument are transmitted to the floor etc. with almost no attenuation. resonates and produces a dissonant sound that does not harmonize with the instrument sound,
Instrument sounds may begin to sound distorted, or vibrations from the floor may be transmitted to windows, wall materials, or other structures, creating noise. In the case of pianos in particular, the sound of strings hitting (forced vibration) may occur. There needs to be a balance between the sound and the vibration caused by the resonance between the strings and the soundboard, but the rapid dissipation of specific vibrational energy from the instrument disrupts the balance, making it impossible for the instrument to produce its original sound, which cannot be corrected by tuning. There were drawbacks such as not being able to do so. Next, in the case of a rubber support as shown in Figure 6, although a vibration damping effect is observed, it does not exhibit a uniform damping effect over the entire vibration frequency range, so the sound balance There were other drawbacks such as the rubber itself collapsing, causing a so-called sound dropout phenomenon, and the timbre of the instrument changing due to the rubber itself vibrating. [Means for Solving the Problems] In view of the current situation, the present invention provides a metal porous structure in which metal particles are integrally bonded so as to have a density gradient in the thickness direction while maintaining porosity by heating and pressurizing. A lower plate that is larger than the perforated plate and has a different rigidity from the perforated plate is laminated on the lower surface of the plate, and a lower plate that is not larger than the perforated plate and has a different rigidity from the perforated plate is laminated on the upper surface of the perforated plate. The present invention is characterized in that upper plates are laminated, and a frame for regulating movement of the musical instrument is erected on the outer peripheral edge of the lower plate and does not touch the perforated plate or the upper plate. [Function] The musical instrument support according to the present invention has a high rigidity, a large mass, and a porous, multi-layered metal perforated plate that is sandwiched between upper and lower plates with different rigidities. The vibrations of the instrument are uniformly blocked over the entire frequency range, suppressing the rapid attenuation of specific vibrations of the instrument, and the vibrations that reach the perforated metal plate are attenuated by the high and uniform vibration damping ability. The energy balance is not disrupted, the timbre of the instrument and the clarity of the sound are almost completely maintained, the delicate nuances of the playing touch are accurately expressed, and the transmission to the floor is extremely small, resulting in In addition to making it difficult for sound to become cloudy due to vibrations such as noise, it is also possible to prevent noise from being transmitted to the building blocks such as windows and wall materials. [Example] Hereinafter, the present invention will be explained in detail according to the example shown in FIGS. 1 to 3. In Figures 1 to 3, reference numeral 1 indicates a metal porous plate that plays an important role in the musical instrument support A according to the present invention. It is formed by being integrally bonded so as to have a layered density gradient in the direction. As the metal particles, granular materials such as iron-based metal materials and aluminum-based metal materials are used.
The use of cutting waste from metals such as castings and aluminum alloys is preferable from a cost standpoint. In particular, when gray cast iron granules are used, they have excellent vibration damping ability due to internal friction between the fine iron particles and fine carbon pieces that constitute them. The particle size of the metal particles can range from 5 to 150 mesh. Furthermore, in order to achieve vibration isolation and vibration damping, metal porous plates must have a layered structure with density gradients in the thickness direction, such as sparse-dense-loose, dense-loose-dense, or sparse-dense. is necessary. In particular, the sparse-dense-
Those having a sparse layered structure are preferred. This is because, in general, a layered structure resists the progression of vibration, causes internal loss of vibration energy due to friction, and exhibits an excellent damping function against vibration. Further, the thickness can be selected as needed within the range of, for example, 5 to 30 mm, but it is usually preferably about 10 to 20 mm. The thicker the perforated metal plate is, the more effective it is in blocking and damping vibrations, but in the case of musical instruments, especially pianos, it is necessary that the position is not too high, and the above range is optimal. , and sufficient effects can be obtained within that range. Such a metal porous plate can be manufactured by any method, but for example, a predetermined amount of metal material particles are loaded into a mold having integral side walls, a bottom wall, and a counter electrode formed to a predetermined size from a refractory material. Resistance heating is applied while applying pressure using a refractory press, or by repeatedly applying and stopping pressurization, by applying current through electrodes placed at both ends of the formwork until the metal particles are sintered and bonded to each other. At this time, take measures such as making the temperature of the surface layer and/or bottom layer higher (or lower) than other parts, and changing the particle size of the metal particles in layers when charging the metal particles into the formwork. The plate-like body obtained by this method can be provided with a density gradient layered in the thickness direction. In addition, during the above-mentioned heating and pressure molding, a mixture of metal particles and resin or brazing agent, or a mixture of metal particles coated with resin or brazing agent in advance, is used to coat the resin or brazing agent between the metal particles. However, from the viewpoint of vibration isolation and damping effects, it is preferable to directly bond metal particles by sintering (especially cross-linking). Reference numeral 2 in FIG. 2 denotes a lower plate laminated on the lower surface of the metal porous plate 1 with an adhesive or the like, which is larger than the metal porous plate 1 and has a different rigidity from the metal porous plate 1. The lower plate 2 is made of wood, plastic, FRP, etc., and has a different rigidity from the perforated metal plate 1, so that it has a function of reflecting or damping vibrations as well as a reinforcing function. Reference numeral 3 in FIG. 2 denotes an upper plate laminated on the upper surface of the metal porous plate 1 with an adhesive or the like, and is made of the same material (not necessarily the same) as the lower plate 2, and has the same function. It is desirable that the size of the upper plate 3 is approximately the same as that of the metal porous plate 1, but it may be smaller. A frame 4 for regulating musical instrument movement is erected on the outer peripheral edge of the lower plate 2 so as not to come into contact with the perforated metal plate 1 or the upper plate 3, and prevents the feet of the musical instrument from deviating from the support base. are doing. Note that since the musical instrument movement regulating frame 4 is not in contact with the metal porous plate 1 or the upper plate 3, vibrations from the musical instrument are not directly transmitted to the floor or the like via the musical instrument movement regulating frame 4. Table 1 shows the sound quality felt by three pianists (A, B, and C) when they played using the musical instrument support according to the present invention as a piano support. Note that Comparative Example 1 shows the results when a rubber support stand was used, and Comparative Example 2 shows the results when a wooden support stand was used (player: A). Here, 〇 is good, △ is slightly good, ×
indicates defective.

[Effect of idea]

As is clear from the above description, the musical instrument support according to the present invention has metal pores that are integrally bonded so that the metal particles maintain their porosity through heating and pressurization and have a density gradient in the thickness direction. Since we use a laminate with the top and bottom of the board sandwiched between boards with a certain degree of rigidity,
It has both high vibration damping ability and high rigidity, so it does not disturb the vibrational energy balance of the instrument, for example, on a piano, it does not cause an imbalance between percussion and vibration, and it improves the clarity of the instrument's tone and sound. It greatly improves the frequency and playing touch compared to conventional ones, and also suppresses the vibration of the instrument from being transmitted to the floor and walls to about 1/30, preventing the sound from becoming muddy due to the vibration. In addition to making it possible to obtain unprecedented clear sound quality,
It can produce excellent effects such as making it possible to prevent noise from being transmitted to other people due to transmission to the framework of windows and wall materials (core materials, etc.).

[Brief explanation of the drawing]

Figures 1 to 3 show an example of a musical instrument support according to the present invention; Figure 1 is a perspective view thereof, Figure 2 is an enlarged sectional view thereof, and Figure 3 is a perforated metal plate. The enlarged schematic diagrams, FIGS. 4 to 6, are cross-sectional views of a conventional musical instrument support. A... Instrument support stand, 1... Metal porous plate, 2...
...Lower board, 3...Upper board, 4...Frame for regulating musical instrument movement.

Claims (1)

[Scope of utility model registration request] The lower surface of the metal porous plate, in which the metal particles are integrally bonded so as to maintain porosity and have a density gradient in the thickness direction by heating and pressurizing, has a material larger than the perforated plate and different from the perforated plate. A lower plate having different rigidities is laminated, an upper plate which is not larger than the perforated plate and has a different rigidity than the perforated plate is laminated on the upper surface of the perforated plate, and the perforated plate and the perforated plate are laminated on the outer peripheral edge of the lower plate. A support stand for a musical instrument, characterized in that a frame for restricting the movement of the musical instrument is provided that does not come into contact with the upper plate.