JPH0547992U - Sound board mounting structure - Google Patents

Abstract

(57) [Abstract] [Purpose] When the soundboard is driven by an actuator, it should produce good sound in the low frequency range. [Structure] A part of a bending column 16 of a grand piano is projected to a predetermined height, and a fixing portion 18 at a peripheral portion of a tongue-shaped soundboard 11 is fixed to a sounding board 17 which is the projecting portion. As indicated by diagonal lines in FIG. 1, the fixing portions 18 are arranged along the peripheral edge of the soundboard 11 at predetermined intervals. When a soundboard driving actuator is fixed to the soundboard 11 and the soundboard 11 is vibrated,
Good vibration is possible even in the low frequency range,
It is easy to pronounce the low range.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for mounting a soundboard of a piano, in which a part of the peripheral portion of the soundboard is fixed to a support to improve sound quality particularly in a low tone part.

[0002]

[Prior Art]

 Conventionally, the sound board of an acoustic piano is fixed by sticking the peripheral part to a wooden crosspiece (a bending support) provided inside a wooden frame of a skeleton. A sound stick is attached to the back of the soundboard, and pieces are attached to the front of the soundboard. Therefore, the sound board is configured to push up the strings via the bridge.

[0003]

[Problems to be solved by the device]

 However, in the conventional soundboard mounting structure, the following problems have occurred because the entire periphery of the soundboard is attached and fixed to the bending column. For example, when the soundboard is directly vibrated by an electromagnetic actuator to obtain sound, it is necessary to convert the vibration in the low frequency (low-pitched) range into sound if the soundboard's entire periphery is firmly fixed. Was extremely difficult, and there was a desire for improvement.

[0004] Therefore, an object of the present invention is to provide a soundboard mounting structure in which the sound in the low-pitched sound range is excellent when the soundboard is directly vibrated.

[0005]

[Means for Solving the Problems]

 The invention according to claim 1 is a soundboard mounting structure in which a part of the peripheral edge of the soundboard is fixed to the support and the other part of the peripheral is not fixed to the support.

[0006]

[Action]

 In the soundboard mounting structure according to the first aspect of the invention, the soundboard is fixed to the support at a part of the peripheral edge thereof, so that the soundboard easily vibrates, and particularly the low-pitched sound is produced well.

[0007]

【Example】

 Hereinafter, embodiments of a soundboard mounting structure according to the present invention will be described with reference to the drawings. 1 to 4 are views for explaining a first embodiment of the present invention. FIG. 1 is a front view showing a schematic configuration of a soundboard according to a first embodiment of the present invention. 2, 3, and 4 are cross-sectional views taken along the lines II-II, III-III, and IV-IV in FIG.

As shown in these figures, the soundboard 11 of the grand piano is composed of a flat plate material having a predetermined size and shape (almost a tongue shape), and has a long piece 12 and a short piece 13 on the surface. Are glued together. A plurality of sound sticks 14 are attached to the back surface of the sound board 11.

On the other hand, 15 is a kneading side plate formed in a curved shape in the shape of the tongue, and a kneading column 16 is fixed to the inside of the kneading side plate 15. The bending column 16 is formed so that its height is lower than that of the bending side plate 15, and the upper end surface of the bending column 16 forms a step to form a sounding board 17.

By fixing the peripheral portion of the soundboard 11 to the soundboard 17, the soundboard 11 is horizontally supported by the bending side plate 15 and the bending column 16. In this case, a part of the soundboard 11 is fixed to the sounding board 17 along the peripheral edge of the sounding board 11, as indicated by the diagonal lines in FIG. The fixing portions 18 are arranged along the peripheral edge of the soundboard 11 at substantially equal intervals over the entire peripheral edge portion.

More specifically, as shown in FIGS. 2 to 4, in the extending direction (the direction along the periphery of the soundboard 11), the upper surface of the bending strut 16 projects at a predetermined height at predetermined intervals. The sounding plate 11 is fixed on the upper surface of the protruding portion to form the fixing portion 18. In other words, the peripheral portion of the soundboard 11 is not fixed to the upper surface other than the protruding portion, and the peripheral portion of the soundboard 11 has the fixed portions 18 and the non-fixed portions alternately arranged at predetermined intervals. It is a thing.

In FIG. 1, 19 is a straight column, 20 is a back frame, and 21 is a tree with a middle frame. A part of the peripheral portion of the soundboard 11 is also fixed to the center frame attachment tree 21 at predetermined intervals.

Therefore, when, for example, an actuator for driving the soundboard is fixed to the soundboard 11 to vibrate the soundboard 11, the soundboard 11 is attached to the bending column 16 with a structure that is more likely to vibrate than in the past. As a result, it is possible to vibrate sufficiently well even in the low frequency range, and it is easy to produce the low frequency range.

FIG. 5 shows a second embodiment of the present invention. As shown in this figure, when the peripheral portion of the soundboard 11 is fixed to the bending strut 16, a compression spring 22 may be interposed between the peripheral portion of the soundboard 11 and the sounding board 17. Reference numeral 23 denotes a wood screw for fixing the soundboard 11 to the soundboard 17. Since a part of the peripheral edge of the soundboard 11 is fixed via the compression spring 22 in this way, the soundboard 11 is more likely to vibrate in the low frequency range. Moreover, by adjusting the screwing amount of the wood screw 23, the strength of the fixing portion can be easily adjusted.

FIG. 6 shows a third embodiment of the present invention. In this embodiment, the soundboard 11 is fixed to the bending strut 16 with bolts 24 and nuts 25 instead of the wooden screws 23 of the second embodiment. According to this embodiment, the screwing amount of the bolt 24 can be adjusted more easily than in the second embodiment.

FIG. 7 shows a fourth embodiment of the present invention. In this embodiment, in the case of the above-mentioned third embodiment, a step is formed on the sound table 17 on the upper surface of the bending column 16. That is, the bolt hole forming portion 26 is formed from the inner side surface of the bending column 16 to the thickness 2/3, and the remaining 1/3 thickness portion from the outer surface is a predetermined height from the bolt hole forming portion 26. The stepped surface 27 is formed at the position. The soundboard 11 is positioned by bringing the peripheral portion of the soundboard 11 into contact with the step surface 27. Therefore, when tightening the bolts 24 via the compression springs 22, all bolts 24 can be tightened with a uniform tightening force. As a result, it is more advantageous to generate bass.

FIG. 8 shows a fifth embodiment of the present invention. As shown in this embodiment, a taper washer 28 may be interposed between the head of the bolt 24 and the upper surface of the soundboard 11 when fixing the periphery of the soundboard 11.

[0018]

[Effect of the device]

 As described above, according to the soundboard mounting structure of the present invention, when the soundboard is directly vibrated, the low-pitched sound can be produced well.

[Brief description of drawings]

FIG. 1 is a plan view showing a soundboard mounting structure according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG. 1 showing a soundboard mounting structure according to a first embodiment of the present invention.

FIG. 3 is a sectional view taken along the line III-III in FIG. 1 showing a soundboard mounting structure according to a first embodiment of the present invention.

FIG. 4 is a sectional view taken along the line IV-IV of FIG. 1 showing a soundboard mounting structure according to the first embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view showing a fixing portion similar to FIG. 2 of a soundboard mounting structure according to a second embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view showing a portion similar to FIG. 2 of a soundboard mounting structure according to a third embodiment of the present invention.

FIG. 7 is a longitudinal sectional view showing a portion similar to FIG. 2 of a soundboard mounting structure according to a fourth embodiment of the present invention.

FIG. 8 is a longitudinal sectional view showing a portion similar to FIG. 2 of a soundboard mounting structure according to a fifth embodiment of the present invention.

[Explanation of symbols]

11: sound board, 16: music support, 17: sound stand, 1
8: Fixed part

Claims (1)

[Scope of utility model registration request] 1. A soundboard mounting structure, characterized in that a part of the peripheral edge of the soundboard is fixed to a support, and the other part of the peripheral is not fixed to the support.