JP3329577B2 - Upright piano support - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wooden support for holding an upright piano soundboard.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, in an upright piano 50, a rectangular frame formed by a vertically arranged column 52, a horizontally arranged base 54 and a box 56. 58 were provided. A rectangular strike 60 is fixed to the frame 58, and a sound board 62 is attached to the strike 60.
Was joined.

[0003] Referring to Fig. 3, the structure of the joint portion of the strut 52, the striking member 60 and the sound board 62, which form a part of the frame 58, will be described. The prismatic strut 52 and the striking member 60 are connected via a nail (not shown). The beater 60 and the soundboard 62 are adhered to each other by an adhesive.

Further, in order to reduce the vibration loss at the fixed end of the soundboard 62 (joint portion with the hitting board 60) and improve the vibration efficiency of the soundboard 62, the hitting board 60 has a relatively hard wood. Was used.

[0005]

However, even if wood having the highest hardness is selected and used for driving, there is a limit in reducing the vibration loss of the soundboard, and the joint between the driving and the frame is limited. , It was difficult to improve the vibration efficiency of the soundboard.

[0006]

Means for Solving the Problems As means for solving the above-mentioned problems, the support of the upright piano of the present invention is as follows.
A wooden strut for holding a soundboard of an upright piano, wherein a striking portion having a joint surface joined to the soundboard is provided, and the striking portion including a part or all of the joining surface is hardened. It is characterized by being impregnated with a resin.

[0007]

The strut of the upright piano having the above structure is provided with a striking portion on the strut itself, and the soundboard is joined to the joint surface of the striking portion. Since the striking and the support are not separate from each other as in the related art, the work of joining the two is unnecessary. Also, since there is no joint between the striking and the column, no vibration loss occurs at this joint. Therefore, the vibration efficiency of the soundboard is improved.

Further, since the area where a part or the whole of the joining surface is impregnated with the curable resin in the driven portion,
The hardness of the driven portion is improved. Thereby, the vibration efficiency of the soundboard is further improved. The curable resin refers to a resin having a property of being cured by, for example, a polymerization reaction or the like after impregnation, and a known curable resin such as a urethane-based, polyester-based, or epoxy-based resin can be used. The composition of the curable resin is not limited, and may be a single component or a plurality of components, or may be a resin to which a reaction accelerator or the like is added. However, the use of the thermosetting resin is not preferable depending on the heating conditions because the post itself, which is wood, is heated during the curing reaction.

[0009] The impregnation of the curable resin may be performed by a known method, and is not particularly limited. It is sufficient that the impregnation of the curable resin is performed in the driving portion including the joining surface. The impregnation depth is
Although it depends on the material of the pillar used and the properties of the curable resin, it is sufficient if the support is impregnated up to about 2 mm from the joint surface. At this time, it is not necessary that the entire bonding surface be an impregnated region, and an unimpregnated portion may be partially present. There is no problem even if the impregnation is performed over the entire surface of the support, and the effect of reducing the vibration loss of the soundboard is further enhanced by improving the hardness of the entire support.

[0010]

Next, embodiments of the present invention will be described. FIG.
FIG. 2 is a cross-sectional view of a joint between a support pillar 10 and a soundboard 20 of an upright piano. The structure other than the strut 10 and the soundboard 20 is the same as that of a conventional upright piano, and thus illustration and description are omitted.

As shown in FIG. 1, the support 10 is integrally provided with a pillar-shaped main body 12 and a striking portion 14 provided to protrude from the main body 12. The main body 12 corresponds to a conventional strut, and the striking portion 14 corresponds to a conventional striking. The strut 10 of this embodiment has both functions of the strut and the striking.

The strut 10 is impregnated and cured with a moisture-curable urethane resin over substantially the entire striking portion 14 and a part of the main body portion 12 (indicated by changing the hatching direction and hatching density in the figure). Is provided. Further, the soundboard 20 and the support 10
And are glued.

The strut 10 has a striking part 1 as shown in the drawing.
Since the body 4 and the main body 12 are integrated, there is no need for an operation for joining the two. In addition, since there is no joint between the driving portion 14 and the main body 12 as a matter of course, no vibration loss occurs at this joint. Therefore, the soundboard 20
Vibration efficiency is improved.

Further, since the area including the bonding surface 18 is hardened by the impregnation of the curable resin in the driving section 14, the hardness of the driving section 14 is improved. Thereby, the vibration efficiency of the soundboard 20 is further improved. As described above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to such embodiments, and can be variously implemented without departing from the gist of the present invention.

For example, it is also possible to adopt a structure similar to the column shown in the above-described embodiment to a base or a box. With this configuration, the structure of the frame that holds the soundboard is further simplified, and the vibration efficiency of the soundboard is further improved.

[0016]

As described above, according to the upright piano support of the present invention, the strut itself is provided with a striking portion, and the soundboard is joined to the joint surface of the striking portion. As the hitting and the support are not separate bodies as in the past,
The operation of joining the two becomes unnecessary. Also, since there is no joint between the striking and the column, no vibration loss occurs at this joint. Therefore, the vibration efficiency of the soundboard is improved.

Further, since the area where a part or the whole of the joining surface is impregnated with the curable resin in the driven portion,
The hardness of the driven portion is improved. Thereby, the vibration efficiency of the soundboard is further improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a joint between a strut and a soundboard of an upright piano according to an embodiment.

FIG. 2 is a sectional view showing an outline of a conventional upright piano.

FIG. 3 A conventional upright piano strut, hammering,
It is sectional drawing near the joint part of a soundboard.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... prop, 12 ... body part, 14 ... hammering part, 16 ... impregnation part, 18 ... joining surface, 20 ...
Soundboard.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-136693 (JP, A) JP-A-54-99614 (JP, A) Jikai Sho 54-111147 (JP, U) 713 (JP, B2) Jigyo 62-46221 (JP, Y2) Jigyo 55-33347 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) G10C 3/06 G10C 3 / 04 G10C 1/02

Claims (1)

(57) [Claims] 1. A wooden support for holding a soundboard of an upright piano, comprising: a driving portion having a joint surface to be joined to the soundboard; and a striking part including a part or all of the joint surface. A pillar of an upright piano, characterized in that a turning portion is impregnated with a curable resin.