JP2004151594A - Supporting device of grand type electronic piano - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a supporting device of a grand type electronic piano which can effectively reinforce a keybed and surely suppress the vibration of a piano body without sharply increasing a manufacturing cost. <P>SOLUTION: The supporting device of the grand type electronic piano 1 is constituted so as to support the piano body 2 having the keybed 7 integrated with the lower end part of the piano body 2 is provided with a plurality of legs 3 having end parts fixed on the keybed 7 by screws 17 and extended in the vertical direction to support the piano body 2 and a reinforcing board 13 attached to the lower side of the keybed 7 and clamped together with the keybed 7 by the screws 17. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
The present invention relates to a grand-type electronic piano support device for supporting a piano body in a grand-type electronic piano having an outer shape similar to that of an acoustic grand piano.
TECHNICAL FIELD OF THE INVENTION
[0002]
[Prior art]
As a result of the search by the present applicant, no prior art document describing the technology related to the present invention could be found. For this reason, in this section, a description will be given of a technique that has been generally implemented conventionally.
[0003]
As a conventional general ground-type electronic piano, for example, the one shown in FIG. 5 is known. The grand type electronic piano 51 includes a piano body 52 and three legs 3 supporting the same. The piano main body 52 includes a main body case 54 constituting an exterior of the piano main body. The main body case 54 is provided with a keyboard, an operation panel (neither is shown), or the like.
[0004]
The main body case 54 is formed by connecting a plurality of components such as plywood, such as a side plate 8, a top plate 10, a large openable and closable roof 11, and a mouth bar 12, with a shelf plate 57 as a base. The shelf board 57 is made of a single piece of plywood. A keyboard, an operation panel, and the like are supported at a front portion thereof, and legs 3 are attached to left, right, and rear ends of a lower surface, respectively. As shown in FIG. 6, each leg 3 is attached to the shelf board 57 by a mounting bracket 15, a bolt 17 and a nut 19 with a washer 18 screwed to the upper surface thereof. Further, a pedal unit (both not shown) including a plurality of pedals for imparting a pedal effect is attached to the front center of the lower surface of the shelf board 57. The pedal unit extends in the up-down direction and is provided so as to float from the floor surface F.
[0005]
The thickness of the shelf 57 is about 18 mm, which is much smaller than the thickness (for example, about 40 mm) of the shelf of an acoustic grand piano (hereinafter simply referred to as “grand piano”). This is because, in a grand piano, a large number of actions and strings for generating an acoustic sound are provided on the main body of the piano, and further, heavy columns and frames are provided to support a large tension of the strings. In order to sufficiently support these large weights, the shelf itself must have high strength. On the other hand, in the grand type electronic piano 51, the piano body 52 is provided with the above-mentioned heavy objects. This is because the shelf board 57 is not required to have such high strength.
[Problems to be solved by the invention]
[0006]
However, in the conventional grand type electronic piano 51, since the weight of the piano body 52 is not large, a relatively thin shelf plate 57 is used, and the shelf plate 57 is not reinforced by a support or the like. However, the rigidity of the shelf board 57 itself and the rigidity of the connecting portion between the shelf board 57 and the leg 3 tend to be insufficient. For this reason, when a relatively large external force acts on the piano body 52, for example, when a key is strongly pressed or a pedal is depressed strongly, the shelf 57 is bent and deformed by the key pressing force or the pressing force. As a result, the swing of the leg 3 causes the piano body 52 to sway as shown in FIG. 6, and in extreme cases, hinders smooth performance.
[0007]
Such a problem can be solved to some extent by, for example, increasing the thickness of the shelf board 57. However, in that case, the plywood used as the shelf board 57 is not so commercially available as a generally thick plywood, and becomes an expensive custom-ordered product. In addition, when the shelf board 57 becomes heavy, workability and handleability are reduced, for example, the processing becomes difficult. Further, when the shelf 57 is partially damaged, the thick shelf 57 must be replaced as a whole, and it is difficult to obtain the material, and the maintenance cost also increases. .
[0008]
The present invention has been made in order to solve such a problem, and it is possible to effectively reinforce a shelf board, thereby reliably suppressing the swing of a piano body without significantly increasing the manufacturing cost. It is an object of the present invention to provide a supporting device for a grand-type electronic piano that can be used.
[0009]
[Means for Solving the Problems]
In order to achieve this object, an invention according to claim 1 of the present invention is a support device for a grand-type electronic piano for supporting a piano body having a shelf plate integrated at a lower end, wherein the upper end is a shelf. A plurality of legs fixed to the plate with screws, extending in the vertical direction, supporting the piano body, and a reinforcing plate stacked on the lower side of the shelf and fastened to the shelf with screws. Features.
[0010]
According to the supporting device for a grand-type electronic piano, a reinforcing plate is provided separately from a shelf plate provided integrally with a lower end portion of the piano body, and the reinforcing plate is stacked below the shelf plate. It is screwed to the legs together with the shelf. Therefore, the rigidity of the shelf plate is increased and the rigidity of the connecting portion between the shelf plate and the legs is increased by the addition of the reinforcing plate. As a result, when an external force acts on the piano body during a performance or the like, it is possible to reduce the bending deformation of the shelf board and the wobbling of the legs, thereby reliably suppressing the swinging of the piano body.
[0011]
In addition, since the shelf plate and the reinforcing plate each need not be so thick, it is sufficient that the weight of each is small as compared with the case where one shelf plate having a large thickness is used. Performance and handleability are improved. In addition, for the same reason, the shelf plate and the reinforcing plate can be configured using commercially available ones, such as the same shelf plate as the conventional one can be used as it is, and expensive custom-ordered products are not required, thereby suppressing material costs. be able to. Further, since the reinforcing plate is fastened to the legs together with the shelf plate, the assemblability is improved.
[0012]
According to a second aspect of the present invention, in the support device for a grand type electronic piano according to the first aspect, the reinforcing plate is partially arranged in a plane with respect to the shelf.
[0013]
According to this configuration, the reinforcing plate can be intensively arranged only in a portion where the reinforcement of the shelf board is particularly required. As a result, the above-mentioned reinforcement of the shelf board by the reinforcement plate can be effectively performed. In addition, the weight and the material cost can be reduced because the reinforcing plate is partially provided. Further, for example, when the reinforcing plate is damaged, only the reinforcing plate needs to be replaced without changing the shelf plate, so that the maintenance cost can be reduced.
[0014]
According to a third aspect of the present invention, in the supporting device for a grand type electronic piano according to the second aspect, the reinforcing plate is disposed at the front portion of the shelf plate over the entire left-right direction.
[0015]
In general, most of the key pressing force of the keyboard and the stepping force of the pedal act on the front portion of the shelf plate during performance, and legs are attached to the left and right ends thereof. Therefore, by arranging the reinforcing plates as described above, the reinforcing effect of the shelf plate can be obtained very efficiently by the reinforcing plates of the minimum size.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a grand type electronic piano to which the present invention is applied (hereinafter simply referred to as “electronic piano”). Note that, among the components of the electronic piano 1, those having the same configuration as the conventional electronic piano 51 described above are denoted by the same reference numerals and will be described. The electronic piano 1 simulates the external shape of an acoustic grand piano, and includes a piano body 2 and three legs 3 for supporting the piano body 2 on a floor F.
[0017]
The piano body 2 is provided with a keyboard 5, an operation panel 6 provided with various switches and indicators, and the like on a body case 4 constituting the exterior thereof, and a detection device for detecting key press information of the keyboard 5, It incorporates a performance sound generation device (both not shown) for generating a performance sound in accordance with the detection result.
[0018]
The main body case 4 is formed by connecting a plurality of wooden components such as plywood to each other and assembling them. More specifically, a shelf plate 7 (see FIG. 2) which is arranged at a lower end portion and constitutes a base of the piano body 2, a side plate 8 surrounding the outer periphery of the shelf plate 7, and a music stand fixed to the upper surface of the side plate 8 9 comprises a top plate 10 to which is attached, a large openable and closable roof 11 disposed behind the top plate, and a mouthpiece 12 for covering the front surface of the shelf plate 7.
[0019]
As shown in FIG. 3, the shelf plate 7 is formed in a shape and a size over the entire plane of the piano body 2, and is made of a single plywood having a thickness of about 18 mm. Further, a reinforcing plate 13 for reinforcing the shelf plate 7 is stacked below the front portion of the shelf plate 7 and attached as described later.
[0020]
The reinforcing plate 13 is made of a plywood having a thickness of about 18 mm, which is equivalent to that of the shelf plate 7, and is made of a wood material such as MDF or particle board. The reinforcing plate 13 is formed in a horizontally long rectangular shape, and has the same width (length in the left-right direction) as the front portion of the shelf 7 and a predetermined depth (at least larger than the sum of the depths of the keyboard 5 and the operation panel 6). (Length in the front-rear direction), and the keyboard 5 and the operation panel 6 are supported by a portion of the shelf 7 that overlaps with the reinforcing plate 13.
[0021]
Each leg 3 is made of Muku wood having a rectangular cross section, is tapered downward, and has a caster 14 for movement attached to its lower end. Of the three legs 3, the left and right legs 3 on the front side are attached to the shelf plate 7 via the reinforcing plate 13 as follows. That is, as shown in FIG. 4, the mounting bracket 15 is fixed to the upper surface of the leg 3 with the plurality of screws 16. The mounting bracket 14 is made of, for example, a steel plate, is formed in a T-shape, and a bolt hole 15a is formed on each side of the T-shape. On the other hand, a plurality of bolt holes 7a (only one is shown) and 13a are formed at the left and right ends of the shelf plate 7 and the reinforcing plate 13 so as to correspond to the bolt holes 15a.
[0022]
Then, after the shelf plate 7, the reinforcing plate 13, and the leg 3 are vertically stacked and the bolt holes 7a, 13a, and 15a are aligned, a bolt 17 (screw) is passed through them from the mounting bracket 15 side (below), By tightening the screw portion of the bolt 17 projecting upward from the shelf plate 7 with a nut 19 with a washer 18, the shelf plate 7, the reinforcing plate 13 and the leg 3 are integrally connected to each other and assembled. As described above, when the leg 3 is attached to the shelf 7, the reinforcing plate 13 is jointly fastened together with the shelf 7 with the bolt 17 while being sandwiched between the shelf 7 and the leg 3. As shown in FIG. 3, the rear leg 3 is similarly attached directly to the rear end of the lower surface of the shelf 7 via the mounting bracket 20 without interposing the reinforcing plate 13.
[0023]
At the center of the reinforcing plate 13, a pedal unit 22 including three pedals 21 for providing a pedal effect is attached. The pedal unit 22 extends in the up-down direction and is provided with a space between the pedal unit 22 and the floor surface F, that is, in a state of floating from the floor surface F, and is supported by a plurality of pedal supports 23 attached to the shelf 7. Have been.
[0024]
As described above, according to the present embodiment, the reinforcing plate 13 separate from the shelf plate 7 is stacked on the lower side of the shelf plate 7 and connected to the leg 3 together with the shelf plate 7 by the bolt 17. . Accordingly, the rigidity of the shelf 7 is increased by the addition of the reinforcing plate 13 in this manner, and the rigidity of the connecting portion between the shelf 7 and the leg 3 can be increased. As a result, when an external force acts on the piano body 2 during a performance, for example, when the keyboard 5 is strongly pressed or the pedal 21 is strongly depressed, the bending deformation of the shelf 7 and the wobbling of the legs 3 are prevented. Thus, the swing of the piano body 2 can be reliably suppressed.
[0025]
In addition, since the shelf plate 7 and the reinforcing plate 13 each have a thickness of about 18 mm that is not so large, it is sufficient that the weight of each of them is smaller than that in the case of using one thick shelf plate. By being small, workability and handleability are improved. Further, for the same reason, the shelf plate 7 and the reinforcing plate 13 can be constituted by using commercially available ones such as the same as the conventional shelf plate 7 as it is, and expensive custom-ordered products are not required. Can be suppressed. Further, since the reinforcing plate 13 is fastened to the leg 3 together with the shelf plate 7, the assemblability thereof is also improved.
[0026]
Further, the reinforcing plate 13 is provided only at a front portion of the shelf plate 7 where a large part of the key pressing force of the keyboard 5 and the pressing force of the pedal 21 acts during the performance, that is, only at a portion where the reinforcing of the shelf plate 7 is particularly required. , The reinforcing effect of the shelf plate 7 can be obtained very efficiently by the reinforcing plate 13 of the minimum size. As a result, the weight and material cost of the reinforcing plate 13 can be reduced. Further, for example, when the reinforcing plate 13 is damaged, only the reinforcing plate 13 needs to be replaced while the shelf plate 7 is kept as it is, so that the maintenance cost can be reduced.
[0027]
Note that the present invention can be implemented in various aspects without being limited to the embodiments described above. For example, in the embodiment, the reinforcing plate 13 is formed in a horizontally long rectangular shape and is arranged only at the front part of the shelf 7. However, the reinforcing plate 13 is formed in the same shape and size as the shelf 7, and May be provided throughout. Alternatively, in addition to the reinforcing plate 13, another reinforcing plate may be provided at the rear end of the shelf 7 to connect the rear legs 3. Thereby, the rigidity of the connecting portion between the shelf plate 7 and the rear leg 3 is increased, so that the swing of the piano body 2 can be further suppressed.
[0028]
Further, the central portion of the reinforcing plate 13 may be extended rearward, and the upper end of the pedal support 23 may be connected to that portion. Thus, the swing of the piano body 2 due to the depression of the pedal 21 can be further suppressed. Further, the material of the reinforcing plate 13 is not limited to the wood material illustrated above, but may be another appropriate material such as a metal or a hard synthetic resin. In addition, the configuration of the details can be appropriately changed within the scope of the present invention.
[0029]
【The invention's effect】
As described above, the support device for a grand-type electronic piano of the present invention can effectively reinforce the shelf board, thereby reliably suppressing the swing of the piano body without significantly increasing the manufacturing cost. It has effects such as.
[Brief description of the drawings]
FIG. 1 is a perspective view of a grand electronic piano to which the present invention is applied.
FIG. 2 is a front view schematically showing the grand type electronic piano of FIG. 1;
FIG. 3 is an exploded perspective view showing a configuration of a shelf plate, a reinforcing plate, and legs of the grand-type electronic piano of FIG. 1 and a method of connecting them.
FIG. 4 is a partially enlarged perspective view showing a leg with a mounting bracket attached.
FIG. 5 is a schematic front view similar to FIG. 2, showing a conventional grand electronic piano.
FIG. 6 is an exploded perspective view showing a configuration of a shelf and legs of a conventional grand-type electronic piano and a method of connecting them.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Grand type electronic piano 2 Piano body 3 Leg 7 Shelf board 13 Reinforcement board 17 Bolt (screw)

Claims (3)

A support device for a grand-type electronic piano for supporting a piano body having a shelf plate integrally at a lower end portion,
A plurality of legs having an upper end fixed to the shelf with screws, extending in the up-down direction, and supporting the piano body;
A reinforcing plate superimposed on the lower side of the shelf plate and fastened to the shelf plate together with the screw,
A supporting device for a grand-type electronic piano, comprising: The supporting device for a grand-type electronic piano according to claim 1, wherein the reinforcing plate is partially arranged in a plane with respect to the shelf plate. The support device for a grand-type electronic piano according to claim 2, wherein the reinforcing plate is disposed over the entire front side of the shelf plate in the left-right direction.

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