JPH09179547A - Sound reduction device for piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a piano sound with relatively simple constitution without altering a touch feeling or timbre by providing a flexible sound insulation sheet fitted to the back surfaces of plural members so that the connection parts of the members are covered. SOLUTION: The flexible sound insulation sheet 26 is fitted to the back surfaces of a fixed plate part 5a and a movable plate part 5b so that the part between them is covered. The sound insulation sheet 26 has respective end parts fixed to the fixed plate 27 with screws 28. Consequently, the sound insulation sheet 26 securely prevents a sound from leaking from the gap between the fixed plate 5a and movable plate part 5b. The sound insulation sheet 26 is flexible, so it is fitted having clearance thereby causing no obstacle to the opening and closure of the movable plate part 5b. The sound insulation sheet 26 may be adhered directly to the fixed plate part 5a and movable plate part 5b directly without being fixed with the screws.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piano noise reduction device for reducing the sound emitted from a piano.

[0002]

2. Description of the Related Art Recently, upright pianos have become widespread in ordinary households, and there are many opportunities to play them in a room. However, due to the housing situation in Japan, the volume of conventional pianos tends to be too loud, and for this reason, it is not uncommon for the piano to be played while taking into consideration that the piano sound will not be a noise to the neighborhood. In such cases, the central muffler pedal is generally used in conventional upright pianos. That is, in the conventional upright piano, when the muffler pedal is stepped on, a thin felt or cloth drops between the strings and the hammer due to the action of the levitation rod or wire that interlocks with the muffler pedal, and the hammer strikes the strings from above the felt. Therefore, it is possible to perform the sound reduction performance by considerably lowering the volume.

Alternatively, a muffling piano has been developed to eliminate the noise of the piano. As is well known, the mute piano is designed so that the acoustic normal performance by hammer striking and the mute performance can be switched, and in the mute playing, the hammer striking is stopped by a stopper and the keyboard is played. The key depression information is detected by a sensor provided for each keyboard, and a performance is performed while listening to an electronic sound generated based on the detection result with headphones.

[0004]

However, in the sound reduction performance using the muffler pedal, since the hammer strikes the strings through the felt or the like, the touch feeling and the tone color are different from those in the normal performance. There is a drawback that it ends up. Further, since the degree of the sound reduction effect by the felt tends to be large in the high tone range and small in the low tone range, there is also a drawback that the overall volume balance is disturbed. In addition, when playing a mute piano, the mute piano produces only electronic sounds, which is different from the original acoustic sounds, and because headphones must be worn at all times, it is easy to get tired and practice for a long time. It is not suitable for, and has a drawback that it is expensive because a sensor is provided for each keyboard.

The present invention has been made in order to solve the above problems, and reduces the piano sound with a relatively simple structure without changing the touch feeling and tone color. The purpose is to provide a sound device.

[0006]

In order to achieve the above object, a sound reducing device for a piano according to the present invention includes a case component having a plurality of members rotatably connected to each other and a plurality of members connected to each other. And a flexible sound insulating sheet attached to the back surfaces of the plurality of members so as to cover the portion.

In this noise reduction device, the sound insulation sheet covering the connecting portions of the plurality of members of the case component prevents sound leakage of the piano sound from the connecting portions. Since this connecting portion is a portion where a gap is likely to be generated due to the rotation of the member, by preventing sound leakage from this portion, the volume of the piano sound can be surely reduced without changing the touch feeling and the tone color. can do. Further, since the sound insulating sheet has flexibility, if the sound insulating sheet is attached with play, it does not hinder the rotation of the members.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3
Shows an upright piano to which the present invention is applied. As shown in these figures, the upright piano 1 includes a pair of left and right parent plates 2, 2, a bottom plate 3, an upper front plate 4, a lower front plate 5, a rear roof 6 and a front roof 7 as case parts C. Is equipped with. Further, a keyboard 8, an action 9, a string 10, a soundboard 11, etc. are provided in an internal space surrounded by these case parts C, and a hammer 12 of the action 9 is rotated when the keyboard 8 is pressed. A sound is generated from the soundboard 11 by moving and striking the string 10.

As shown in FIG. 4A, the case component C includes a sound insulating material 13 at the center and lauan plywood 14 on both sides of the sound insulating material 13.
14 and the decorative materials 15 and 15 on both sides thereof, which are made of phenol backer or the like, are laminated and adhered to each other. The sound insulating material 13 is composed of a commercially available sound insulating sheet, a vibration damping rubber sheet, or the like.

According to this construction, the sound generated by the sounding board 11 by the striking string of the hammer 12 is shielded by the sound insulation material 13 when passing through the case component C, and is emitted to the outside in a reduced sound state. . In the upright piano, the ratio of the transmitted sound to the piano sound is very high due to its structure. Therefore, by providing the sound insulating material 13 in the case component C to reduce the transmitted sound as described above, the sound volume is effectively reduced. Can be reduced. In addition, since the sound is generated from the soundboard 11 by directly striking the string 10 with the hammer 12, the sound is reduced without changing the touch feeling or the tone color. You can

The case component C can be arbitrarily configured as long as it has the sound insulating material 13. The material of the sound insulating material 13 is
The number, arrangement, etc. can be changed as appropriate. For example, as shown in FIG. 4 (b), the sound insulating material 13 may be attached to the back surfaces of the decorative material 15 and the lauan plywood 14 that are adhered. . Further, the sound insulating material 13 may be provided only on a part of the case parts C having a large sound reducing effect.

Further, in this upright piano 1, 2
In the part where the two case parts C, C are butted against each other,
It has been covered. In the example shown in FIG. 5, a sealing material 16 is attached to the joint between each parent plate 2 and the upper front plate 4 so as to fill the gap. As a result, the gap at the joint between the main plate 2 and the upper front plate 4 is closed with the sealing agent 16 to prevent sound leakage from this part, so that the sound reduction effect can be further enhanced. In order to surely obtain the sound reduction effect by sealing, the sealing agent 16 is preferably a material having sound insulation and elasticity and having a certain thickness, for example, a commercially available tape made of high-density urethane rubber. Shaped items are suitable.

FIG. 6 shows another example for preventing sound leakage from a gap between case parts. In this example, the flexible sound insulation sheet 17 is bent toward the joint between the main plate 2 and the upper front plate 4, and both ends thereof are crimped to the inner surfaces of the main plate 2 and the upper front plate 4. It was done. Sound insulation sheet 17
Is a rectangular shape having almost the same height as the upper front plate 4, one end of which is bonded to the inner surface of the main plate 2, and
With the whole body bent in a semi-cylindrical shape toward the joint between the main plate 2 and the upper front plate 4, the free other end is pressed against the inner surface of the upper front plate 4 only by its own elastic reaction force. There is.

In this structure, the sound insulating sheet 17 covers the entire joint between the main plate 2 and the upper front plate 4, and both ends thereof are crimped to the inner surfaces of the main plate 2 and the upper front plate 4, respectively. Similarly to the example of FIG. 5, it is possible to prevent sound leakage from the joint portion and obtain a sound reduction effect. Further, since only one end is bonded and the other end is pressure-bonded in a free state, there is an advantage that the upper front plate 4 can be attached and detached without any trouble during tuning. Of course, it is possible to bond both ends, but in view of the above advantages, one end bonding is preferable. When the elastic reaction force of the sound insulation sheet 17 is insufficient for the crimping force, it is preferable to use a leaf spring 18 made of steel, for example, as shown in FIG. As a result, the crimping force is increased by the spring force of the leaf spring 18, and sound leakage can be prevented more reliably.

Both FIG. 5 and FIG. 6 show the main board 2
This is an example in which the joint between the upper front plate 4 and the upper front plate 4 is targeted, but other parts where the two case components C, C are butted against each other, for example, the joint between the main plate 2 and the lower front plate 5, or A sealing agent 16 and a sound insulating sheet 17 may be similarly provided at the abutting portion between the upper front plate 4 and the roof front 7. Further, contrary to the example of FIG. 6, the sound insulating sheet 17 may be adhered only to the upper front plate 4.

As shown in FIG. 1, the lower front plate 5 is constructed so that it can be opened and closed. More specifically, the lower front plate 5 is shown in FIG.
As shown in FIG. 2, it is composed of a fixed plate portion 5a that stands upright from the front base 19 and a movable plate portion 5b that is rotatably attached to the upper end of the fixed plate portion 5a via a hinge 20 (FIG. 2). reference). The hinge 20 has a predetermined angle α (for example, 30
It is a structure that can be rotated only in the range of (degrees). Also,
A stopper plate 22 is provided on the shelf plate 21 so as to project downward at a position facing the movable plate portion 5b.
2, a magnet push latch 23 is embedded, an iron plate 24 is attached to the back surface of the movable plate portion 5b correspondingly, and an operating knob 25 is attached to the front surface.

With the above structure, the movable plate portion 5b is closed by the magnet push latch 23 (see FIG. 7).
Can be opened and closed between a solid line position) and an open position (position indicated by a chain line in FIG. 2) opened by a predetermined angle α with respect to the fixed plate portion 5a. When the movable plate portion 5b is set to the closed position, the movable plate portion 5b can be played in the above-described sound reduction state, and when there is no fear of noise or the like.
With b being the open position, the sound can be emitted directly from the open portion, so that the performance can be performed at a higher volume. In this way, by opening and closing the movable plate portion 5b according to the playing environment, the volume can be switched between the low volume and the high volume and appropriately controlled without changing the touch feeling or the timbre.

Further, a flexible sound insulating sheet 26 is attached to the back surfaces of the fixed plate portion 5a and the movable plate portion 5b so as to cover them. Each end of the sound insulation sheet 26 is fixed by screws 28 via fixing plates 27. Thereby, sound leakage from the gap between the fixed plate portion 5a and the movable plate portion 5b can be reliably prevented by the sound insulation sheet 26. Since the sound insulation sheet 26 has flexibility, if it is attached with play,
It does not hinder the opening and closing of the movable plate portion 5b.

Note that the sound insulation sheet 26 may be directly bonded instead of being screwed to the fixed plate portion 5a and the movable plate portion 5b, or may be extended vertically as shown in FIG. The movable plate portion 5b may be attached so as to cover almost the entire surface thereof to prevent sound leakage more reliably. Further, FIG. 7 is an example in which the lower front plate 5 is configured to be openable and closable, but a similar configuration is applied to another case component C, for example, the upper front plate 4, instead of or simultaneously with the lower front plate 5. It is also possible to do so.

As shown in FIG. 1, the upright piano 1 further includes a back tone spreader 29 for radiating a piano sound to the outside and an opening / closing mechanism 30 for opening and closing the back tone spreader 29. The back tone spreader 29 has a box-like shape made of wood or resin, extends horizontally to cover almost the entire upright piano 1, and is mounted on the girder 31. In the back tone spreader 29, a radiation passage 32 having a trumpet-shaped cross-sectional shape that spreads outward is formed so as to communicate the inside and outside of the piano.

The opening / closing mechanism 30 opens / closes the radiation passage 32 in conjunction with the middle pedal 33. Specifically, the opening / closing mechanism 30 is rotatably attached to each main plate 2 via a pin 34, and has a lower end connected to a middle pedal 33 via a wire 35. Holder 36 (only one is shown), a pressing bar 37 made of aluminum cast material and the like held between the upper ends of the holder 36, and a cushion 38 made of urethane foam or the like adhered to the front surface of the pressing bar 37. , A coil spring 39 that constantly urges the holder 36 in the counterclockwise direction in FIG. 1.

According to this structure, when the middle pedal 33 is not depressed, the holder 36 of the opening / closing mechanism 30 is rotated counterclockwise by the spring force of the coil spring 39, and the cushion 38 is rotated by the back tone spreader 29. The opening 32a inside the radiation passage 32 is blocked (solid line in FIG. 1). As a result, the emission of the piano sound through the radiating passage 32 is blocked, and the sound reduction performance can be performed in the sound reduction state.

On the other hand, when the middle pedal 33 is stepped on, the holder 36 is pulled by the wire 35 and pivots in the clockwise direction, so that the cushion 38 separates from the opening 32a and opens the radiation passage 32 (see FIG. Two-dot chain line). As a result, the piano sound is radiated through the radiation passage 32, and the performance can be performed at a higher volume. In this way, by operating the middle pedal 33, the volume can be switched between the low volume and the high volume and controlled appropriately without changing the touch feeling or the tone color. Further, in this case, as compared with the case where the lower front plate 5 is opened and closed as described above, there is an advantage that the volume can be appropriately controlled during the performance by operating the middle pedal 33.

A sound insulation sheet may be attached to the front surface of the cushion 38 to further enhance the sound reduction effect during the sound reduction performance. Further, in the above example, the opening / closing mechanism 30 is interlocked with the middle pedal 33, but an operating lever is attached to the lower surface of the shelf board 21 as an operating member, and the opening / closing mechanism is interlocked with the manual operation of the operating lever. Three
It is also possible to activate 0.

Although the above-described embodiment is an example of an upright piano, the present invention is applicable to a grand piano as well.
Of course, it can be applied.

[0026]

As described above in detail, the sound reducing device for a piano according to the present invention can reduce the piano sound with a relatively simple structure without changing the touch feeling and tone color. have.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an upright piano to which the present invention has been applied.

FIG. 2 is a partial front view of the upright piano of FIG.

3 is an external perspective view of the upright piano of FIG. 1. FIG.

FIG. 4 is a cross-sectional view showing a configuration of a case part.

FIG. 5 is a perspective view showing an example of preventing sound leakage between case parts.

FIG. 6 is a perspective view showing another example different from FIG.

FIG. 7 is a side view showing a configuration of a lower front plate.

[Explanation of symbols]

 1 Upright piano 5 Lower front plate 5a Fixed plate part 5b Movable plate part 26 Sound insulation sheet

Claims (1)

[Claims] 1. A case component having a plurality of members rotatably connected to each other, and a flexible member attached to the back surface of the plurality of members so as to cover the connecting portions of the plurality of members. Sound insulation sheet,
A sound reducing device for a piano, which is characterized by being equipped with.