JPS6232307Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the tone escape structure of a piano.

A conventional upright piano has a keyboard section on the front side, and an exposed soundboard that radiates to the player on the back side. String vibrations generated in response to key operations are transmitted to the soundboard via the bridge, distributed throughout the soundboard via the sounding rod, and radiated from the soundboard as string striking sound.

However, when such an upright piano is used in a general home, it is installed with the back surface facing a wall surface, so the soundboard surface is often sealed off. Therefore, the sound radiated from the soundboard surface during performance is significantly obstructed by the wall surface, making it impossible to obtain performance sound with good sound quality.
Furthermore, since the inner surface of the soundboard faces the inside of the housing, which has a sealed structure, the radiated sound from the inner surface is muffled along with the direct string strike sound, making it difficult to obtain a clear performance sound and making it difficult to There was a problem in that it was not possible to get a sense of volume.

This idea was made to solve these conventional problems, and it allows the sound radiated from the soundboard to be sufficiently radiated to the outside, making it possible to obtain a clear performance sound and increase the sense of volume. The purpose is to provide a piano tone escape structure that can be used.

In order to achieve this purpose, this invention divides the front plate of a piano into a plurality of parts and arranges them side by side in the left-right direction, and attaches each divided front plate to a fixture so that the ends overlap each other with a gap between them. It is to be placed in

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an embodiment of this invention. In FIG. 1, a housing 1 constituting the exterior body of the piano includes a pair of left and right main plates 2 and metal fittings 4a and 4, which will be described later.
three upper front plates 3a arranged in parallel in the left-right direction with a step so as to form a gap between them;
3b, 3c, a lower front plate 5, a roof plate 6, and a bottom plate (not shown) in a vertical structure, and the back part of the housing 1 is sealed with a soundboard (not shown). There is. A metal frame is attached to the interior of the casing 1 adjacent to the soundboard, strings are stretched over this frame, and the strings are locked to pieces attached to the soundboard. Further, an action mechanism is provided inside the housing 1, and this action mechanism is driven and controlled by a keyboard 7 that is formed protruding between the upper front plates 3a, 3b, 3c and the lower front plate 5, so that strings can be struck. String vibrations caused by string striking are transmitted to the soundboard via the bridge, and the vibrations of the soundboard are radiated to the player.

As shown in FIG. 2, the fixture 4a has a shape in which a rectangular metal plate having a plurality (three in FIG. 2) of rectangular openings 41 is bent at right angles in two places. The first mounting portion 42 and the step forming portion 4
3 and a second attachment part 44, the width W of the step forming part 43 is set larger than the thickness D of the end part 31a of the upper front plate 3a, and the first attachment part 42 and the second attachment part 44 are are provided with a plurality of holes 45 and 46 for passing screws therethrough, respectively.

The first attachment part 42 is fixed by passing a hole 45 into the back surface of the thinner end 31a of the upper front plate 3a and fixing the second attachment part 42 with a screw.
are fixed by passing screws through holes 46 into the back surface of the upper front plate 3b, thereby fixing the ends 31a and 31b of the upper front plates 3a and 3b so as to overlap with a predetermined gap.

The fixture 4b also has the same configuration as the fixture 4a,
The upper front plates 3b and 3c are fixed with a predetermined gap.

In an embodiment configured as described above, when a key is operated and a string is struck by the action mechanism during a performance, the resulting string vibration is transmitted to the soundboard via the bridge and is also transmitted to the soundboard via the sound rod. It is distributed throughout the board and is radiated from the soundboard as the sound of the strings being struck. This radiated sound is transmitted through the openings 4 of the fixtures 4a and 4b.
1. It is radiated to the outside through the gap between the upper front plates 3a and 3b and the gap between the upper front plates 3b and 3c. Therefore, the radiated sound from the soundboard is not trapped inside the housing 1, so that a clear performance sound is obtained and the sense of volume is increased.

In addition, since the front board is divided into a plurality of parts, it is easier to manufacture than the conventional front board made of a single board, the yield of the wood itself is high, and it is effective in absorbing warping and the like. Furthermore, since the gap between the front plates extends in the vertical direction, the directionality of sound is improved. In other words, since the housing 1 that emits sound from the gap to the front can be considered as a line sound source arranged along the gap, the vertical spread of sound when radiated from a single sound source is , when it comes to line sound sources, each sound source is compressed, and this compression increases the sound spread in the horizontal direction, creating a tone zoyle effect. Therefore, the directivity of sound is improved, making it suitable for concerts and the like.

FIG. 3 shows another embodiment of this invention, in which the lower front plate is divided into three parts, and each lower front plate 5a, 5b, 5c is attached to a mounting bracket 1 having a structure similar to the mounting fixtures 4a, 4b described above.
4a and 14b are attached with a gap between them. Even in this case, the same effect as the embodiment shown in FIG. 1 can be obtained.

Figure 4 shows the divided upper front plates 3a, 3b, 3.
Alternatively, the lower front plates 5a, 5b, 5c are attached using L fittings 24a, 24b having openings. Even if such an L fitting is used, the above Z
The same effect as when using the letter-shaped fixtures 4a and 4b is obtained.

FIG. 5 shows the divided upper front plates 3a, 3b,
3c or the lower front plate 5a, 5b, 5c with a spacer 34a having a groove 50 as shown in FIG.
34b with a gap between them. Even in this case, the same effect as in the above embodiment can be obtained.

Note that the fixture used in the embodiment shown in Fig. 1 has a rectangular opening, but the opening is not limited to a rectangle, but may be circular or elliptical; It suffices if an opening is formed to communicate with the gap between them.

Furthermore, any number of openings may be formed in the fixture.

Further, in the above embodiment, the front plate has a three-part structure, but it may be divided into any number of parts.

As is clear from the above explanation, this idea is
The front board is divided into multiple parts and arranged side by side in the left and right direction, and each of the divided front boards is arranged using a mounting device so that the ends overlap with each other with a gap between them, which reduces radiation from the soundboard. Since the sound is radiated to the outside through the gap, it is possible to suppress the resonance phenomenon of the cavity closed by the exterior body, and a clear performance sound can be obtained, the sense of volume is increased, and the gap is vertical. As a result, a tone wave effect is obtained, and the directivity of sound to the player is improved, which has the effect of enhancing playability. In addition, each front plate is arranged so that its ends overlap with each other, so the mounting hardware is not visible from the outside, which is good for the piano's aesthetics. Furthermore, the design of the combined parts of the divided front plates has been devised. This has the advantage of enhancing the aesthetic appearance.

Further, by dividing the front plate, a smaller plate material can be used, and the yield can be reduced to reduce the production cost and prevent the occurrence of upward warpage.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of one embodiment of this invention, Fig. 2 is a perspective view showing a fixture used in the embodiment of Fig. 1, and Fig. 3 is a perspective view of another embodiment of this invention. A partially cutaway perspective view of the embodiment; Fig. 4 is a perspective view of an embodiment in which the divided front plate is attached with L fittings; Fig. 5 is a perspective view of the embodiment in which the divided front plate is attached with a spacer having a groove. FIG. 6 is a plan view showing an example of the spacer shown in FIG. 5, and FIG. 6 is a perspective view showing the spacer shown in FIG. 3a, 3b, 3c... Upper front plate, 4a, 4b...
Attachment, 31a, 31b... end, 41... opening, 42... first attachment part, 43... step forming part, 4
4...Second mounting part.

Claims (1)

[Claims for Utility Model Registration] (1) The front plate of a piano is divided into a plurality of parts and arranged side by side in the left and right direction, and a fixture is interposed between the adjacent front plates so that their ends are spaced apart from each other. The piano's tone escape structure is characterized by the structure of the piano's tone escape, which is arranged so that it overlaps the front and back. (2) Utility Model Registration Claim 1: The piano tone escape structure according to claim 1, wherein the fixture is stepped or Z-shaped and has an opening. (3) Utility Model Registration Claim 1: The piano tone escape structure according to claim 1, wherein the fixture is a spacer in which a plurality of grooves are formed.