JPH08320683A - Frame for piano and piano - Google Patents

Abstract

PURPOSE: To provide a frame which may be provided with a function as structural materials, such as backposts, by subjecting the frame to a treatment to enhance the dimensional accuracy of the frame without requiring special equipment even if the frame of the state produced by casting, etc., is low. CONSTITUTION: A wooden plate material 5 as a buffer material 4b is fixed by means of screws 4f to the flank 4c of a casting body 4a of the frame 4. This fixing is executed with the peripheral edges on the four sides of the casting body 4a. Next, the wooden plate materials 5 mounted to the peripheral edges on the four sides of the casting body 4a are cut by the same device as the four-way cutting device used heretofore to obtain the dimensional accuracy by cutting the four sides of the combined backposts, by which the surfaces 4d for arranging treble and bass end panels, roof rear and bottom plate in correct positions are completed. Then, the subsequent assembly of the piano may be executed by using the surfaces 4d on the circumference of the frame 4 as reference, by which the assembly of the treble and bass end panels, roof rear, bottom plate, etc., is executed with the same high accuracy as in the case of the assembly executed heretofore by using the faces on the circumference of the sound ribs as reference.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piano frame and a piano using this frame.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
It is constructed based on the columns 202, 204, 206 and 208 of the piano. That is, first, the columns 202, 20
4,206,208 are assembled, and the four sides of the strut set are machined in four directions with a moulder to make a precise reference plane, and the striking 210,212 is fixed to the front face of the strut set. On the other hand, the soundboard 200 is fixed. Further, a frame 250 is fixed on the front surface of the strut set so as to overlap the soundboard 200, and a string 252 is stretched on the frame 250. Further, a main board 201 is attached to the left and right of the support post assembly, and an internal structure such as an action mechanism is attached based on the main board 201.

A piano as a whole has a complicated structure, such as the above-mentioned columns, soundboard, frame and action mechanism. Therefore, a large amount of cost and labor are required for the material, its processing, and its assembly, and thus the manufacturing cost is very high. Therefore, as a musical instrument, the piano has a simple structure without deteriorating the acoustic characteristics.
It has been an issue to reduce the cost.

Such a problem is not limited to the above-mentioned upright piano, but is the same for the grand piano. Here, for example, since the frame is generally made of cast metal and is rigid, it may be possible to reduce the number of columns or to eliminate all columns by making the frame also function as a column. To be

[0005]

However, since the frame is manufactured by casting, the dimensional accuracy may not be so high as it is manufactured. Especially, the casting requires a draft or the like, so that the desired external shape is obtained. It may not be molded. When the frame cannot be accurately formed into a desired shape in this manner, the following inconvenience occurs if the frame is also used as a support.

That is, as the function of the pillar, for example,
There is a function that determines the width of the frontage of the Viano by the main board and determines the arrangement standard of the action mechanism inside the piano. For this reason, if the struts have a low shape accuracy and the parent plate to be attached is fixed to the incorrect frontage, it is necessary to accurately arrange the action mechanism between the parent plates. The problem is that it will be extremely difficult.

Therefore, as in the present situation, when the as-cast frame is not so accurate as to attach the master plate or cannot be manufactured in a desired shape, the surface thereof is cut to improve the dimensional accuracy. , It must be adjusted through metal fittings and other members.

However, cutting the surface of the casting frame is not preferable in terms of manufacturing cost because the material is hard and large in size, and a new apparatus for cutting the casting is required in terms of equipment. Also, it is not efficient to attach the metal fittings and adjust the dimensions, which is inefficient.

According to the present invention, even if the precision of the frame manufactured by casting or the like is low, no special equipment is required, and the dimensional precision of the frame can be increased so that the frame also has the function of the column. The purpose is to provide a frame that can.

[0010]

According to the first aspect of the present invention,
The piano frame is characterized in that a wood or plastic material is attached to a peripheral portion thereof, the surface of the wood or plastic material is processed into a desired shape, and the reference surface is used for attaching other members of the piano.

According to a second aspect of the present invention, there is provided a rectangular frame for an upright piano, in which wood or plastic material is attached to the two left and right sides of the frame, and the outer surface of the wood or plastic material is provided between the left and right sides. The piano frame is characterized in that each of the outer surfaces is cut into a flat surface so as to have a desired width, and is used as a mounting surface for mounting a master plate.

The invention according to claim 3 is the invention according to claim 1 or 2.
By using the piano frame described, the pillar is omitted.

[0013]

According to the piano frame of the present invention, the wood or plastic material is attached to the peripheral portion, the surface of the wood or plastic material is processed into a desired shape, and other members of the piano are attached. The reference surface of

As described above, instead of cutting a hard frame generally made of casting, wood or plastic material is attached to the peripheral edge of the frame by, for example, screwing, and the surface thereof is processed, for example, cut. Therefore, it is possible to sufficiently deal with conventional equipment for processing wood and plastic materials, rather than special equipment, and it is easy to use other parts of the piano, such as the parent board in the case of upright pianos, ground, etc. In the case of a piano, it is possible to form a reference surface for attaching side plates, side left and right plates, and the like.

Incidentally, it is not necessary to attach wood or plastic material to the entire peripheral portion, and only the portion serving as the reference surface may be used. In particular, when the frame is a rectangular frame for upright piano, it is
As a mounting surface for mounting wood or plastic material, cutting each outer surface into a flat surface so that the width between the outer surfaces of the left and right wood or plastic material is a desired width, and mounting the master plate. Is also good.

Therefore, the piano using the above-mentioned piano frame may have a structure in which the columns are omitted. Here, the configuration in which the support columns are omitted includes a case in which some support columns are omitted and a case in which all support columns are omitted. These configurations can be applied not only to upright pianos but also to grand pianos.

[0017]

【Example】

[Embodiment 1] FIG. 1 is a vertical sectional view of an upright piano 2 according to an embodiment of the present invention. A frame 4 composed of a cast metal body 4a made of an alloy such as iron or aluminum and a wooden cushioning material 4b attached to the peripheral portion thereof has a parent plate 6 adhered to the cushioning material 4b on the left and right sides thereof. A pin plate 8 is fixed to the upper rear surface of the casting body 4a to hold the tuning pin 10 so as not to loosen it. Further, on the upper portion of the frame 4, a roof rear portion 11 is adhered to the cushioning material 4b.

At the bottom of the frame 4, a bottom plate 12 is provided as a cushioning member 4.
It is glued to b. Further, arms 14 are provided on the left and right of the lower portion of the frame 4 so as to project rearward, and casters 16 are provided on the lower portion of the tip of the arm 14. Therefore, together with the casters 20 provided at the lower ends of the front left and right wife bases 18, the piano 2 can be appropriately moved by human power.

On the rear side of the frame 4, as shown in the rear view of the frame 4 of FIG. 2 and the partially enlarged view of FIG. 6, the soundboard 2 is provided at or near the periphery of the cast body 4a of the frame 4.
A soundboard support fixing part 24 for fixing and supporting 2 is provided. As shown in FIG. 6, the surface of the soundboard supporting / fixing portion 24 forms a tapered surface 24a as a mounting surface that is inclined toward the front side of the frame 4 from the peripheral edge toward the center. Although not shown, the tapered surface 24a is provided with screw holes for screwing at appropriate intervals.

The soundboard 22 is fixed by the screws 26 at the soundboard support fixing portion 24, and the soundboard 22 is entirely supported. A tuning pin 10 and a hitch pin 28 facing the tuning pin 10 are provided on the peripheral portion of the casting body 4a on the front side. A string 30 is stretched between the tuning pin 10 and the hitch pin 28. Further, the piece 32 is fixed to the front side of the soundboard 22 by screwing,
The vibration of the strings 30 is transmitted to the soundboard 22.

As described above, since the soundboard 22 is completely fixed and supported by the cast body 4a of the frame 4, it is not necessary to support the soundboard 22 with the support and the striking as in the conventional case. Further, the casting main body 4a is a metal casting, and the soundboard 22 has a tapered surface that maintains a preferable state of a muffle (also called a crown, that is, a swell in one direction) and firmly supports the soundboard 22. 24a can be formed,
Regarding the side surface 4c of the peripheral portion, the left and right main plates 6, the rear roof 11 and the bottom plate 12 cannot be attached or bonded with screws as they are because of the draft at the time of manufacture.

For this reason, as shown in FIG. 4A, which is a sectional view taken along the line AA in FIG. 2, a cushioning material 4b is provided to cancel the escape gradient θ. In addition, the surface 4d of the cushioning material 4b
Are precisely formed in order to arrange the left and right main plates 6, the rear roof 11 and the bottom plate 12 in correct positions. That is, the planes are highly precise, and the parallelism of the left and right / upper and lower surfaces 4d, the left and right widths D1 and the up and down heights D2 are accurately formed to predetermined values.

The surface 4d of the cushioning material 4b is formed as follows. That is, as shown in FIG. 4 (b), a screw hole 4e is formed in the side surface 4c of the casting body 4a, and the wooden plate material 5 as the cushioning material 4b also has screw through holes 5a, 5b.
Then, the wooden plate member 5 is fixed by screwing the screw 4f into the screw insertion hole 4e of the casting body 4a from the screw through holes 5a and 5b side. This is performed for the four peripheral portions of the casting body 4a. Next, using the same device as the conventional four-side cutting device for cutting the four sides of the combined support columns to obtain dimensional accuracy, the wooden board member 5 attached to the four peripheral edges of the casting body 4a.
Are cut to complete the surface 4d shown in FIG. 4 (a) for arranging the left and right parent plates 6, the rear roof 11 and the bottom plate 12 at correct positions.

Therefore, if the subsequent assembly of the piano 2 is carried out with the peripheral surface 4d of the frame 4 as a reference, the left and right parent bodies are as highly accurate as those conventionally assembled with the peripheral surface of the column as a reference. Plate 6, rear roof 11 and bottom plate 12
It is possible to assemble such as without a column, and accordingly, the arrangement of the internal action mechanism and the like can be accurately determined.

The other structure of the piano 2 is basically the same as that of the conventional piano, and therefore its explanation is omitted. Also,
As described above, the piano 2 of this embodiment includes the left and right main plates 6,
Since the rear roof 11 and the bottom plate 12 are attached to the cushioning material 4b of the frame 4, and further the soundboard 22 is directly attached to the casting body 4a of the frame 4 with screws, a pillar and a whirling are unnecessary, and materials and processing Therefore, the cost required for assembly can be reduced. In particular, it is necessary to form the batting accurately with NC, and also when the batting is attached to the support pillar, it must be mounted precisely, which requires a great deal of skill and is an obstacle to cost reduction. Was there.

Therefore, even if the shape of the frame 4 is different from the conventional one, it does not cause a large increase in cost, and two types of parts, a wooden strut and a particularly hard wooden hammering, and their processing and assembly. The cost reduction by omitting the process is more than compensated for.

Further, acoustically, in the frame 4 in which the soundboard 22 is rigid, a taper surface 24 in consideration of the sound of the soundboard 22 is provided.
Since it is fixed and supported by the soundboard support fixing portion 24 having a, the acoustic impedance of this integrated body is large, and conversely the acoustic characteristics are improved.

Next, in the structure of the piano 2 shown in FIG.
A method of manufacturing the integrated body of the frame 4 and the soundboard 22 will be described. First, as shown in the rear view of FIG. 2, the casting main body 4a having the soundboard support fixing portion 24 for fixing and supporting the soundboard 22 at or around the peripheral portion can be cast with relatively high accuracy. It is integrally molded as a casting by the V process.

Next, as described with reference to FIG. 4, the cushioning material 4b.
Is fixed to the side surface 4c of the casting body 4a and is cut and molded,
Complete Frame 4. Next, as shown in the front view of FIG. 3, a pin plate 8 is attached to the upper back surface of the casting body 4a of the frame 4.
Is fixed, the tuning pin 10 and the hitch pin 28 are attached to the front side, and the string 30 is temporarily laid between the tuning pin 10 and the hitch pin 28.

Next, as shown in the rear view of FIG. 5, the soundboard 22 is fixed to the soundboard support fixing portion 24 with screws 26 from the rear surface of the casting body 4a. Two long and short pieces 32 are screwed to the front side of the sound board 22, and a plurality of sound sticks 34 are adhered to the back side. As a result, an integrated body of the frame 4 and the soundboard 22 shown in the vertical sectional structure of FIG. 6 is completed.
The tension of the strings 30 may be adjusted at this stage.

After that, the other structure of the piano 2 is attached mainly based on the frame 4 and the main plate 6 attached to the frame 4, and the upright piano 2 shown in FIG. 1 is completed. In this manufacturing process, since the pillar and the striking-up are not assembled, the work is simple and quick, and the manufacturing cost is reduced.

[Second Embodiment] FIG. 7 shows a second embodiment. The present embodiment is different from the first embodiment in the configuration of the frame 54. In particular, the taper surface 74a of the soundboard supporting and fixing portion 74 of the casting main body 54a of the frame 54 faces the front side (string side), and the taper surface 24a is the back side (opposite the string side). Is different from that of the first embodiment. The tapered surface 74a is inclined so as to bulge toward the front side toward the center of the frame 54.

Therefore, the soundboard 22 is fixed to the casting body 54a from the front side with the screw 26. Also,
In order to manufacture the integrated body of the frame 54 and the soundboard 22, first, as in the first embodiment, a wooden plate material is formed on the side surface 54 of the casting body 54a.
After the surface 54d is precisely finished by screwing to c and square cutting, the soundboard 2 is attached to the soundboard support fixing portion 74 of the casting body 54a.
2 will be screwed and then the string 30 will be tensioned.

Subsequent assembling to the piano is the same as in the first embodiment.
Is the same as The integrated body of this embodiment has the same effect as that of the first embodiment, and in particular, the pressure exerted by the strings 30 on the soundboard 22 is
The force exerts the soundboard 22 against the tapered surface 74a, and the structure is strong, stable, and durable.

[Third Embodiment] The first and second embodiments described above are examples of the upright piano, but the same applies to the grand piano only with the horizontal arrangement of the frames. The same effect as can be obtained.

The frame 80 of the grand piano is shown in FIG. The casting main body 80a of the main frame 80 has a soundboard support fixing portion 82 at its peripheral portion, and has a soundboard support fixing portion 84 bridged left and right in the vicinity of the peripheral edge portion of the casting main body 80a. As shown in FIG. 9, the soundboard support fixing portions 82 and 84 allow the soundboard 86 to have a screw 88 at its peripheral portion at the taper surfaces 82a and 84a adapted to the muffle of the soundboard 86.
It is fixed by screws and fixed and supported. The taper surfaces 82a and 84a of the soundboard support fixing portions 82 and 84 are
Facing downward, from the periphery of the frame 80 toward the center,
It is inclined above the frame 80.

A cushioning material 80b is fixed to the side surface of the peripheral edge of the casting body 80a with a screw (not shown) as in the first embodiment. And the surface 81 of the cushioning material 80b
Of the a, 81b, 81c, 81d, and 81e, the front surface 81a, the left surface 81b, and the right surface 81e of the cushioning material 80b on the front side of the piano are linear and are left and right side plates of the grand piano. Since it serves as a reference for mounting, the conventional wood processing device is precisely formed with high dimensional accuracy and flatness. Of course, the curved surfaces 81c and 81d of the cushioning material 80b may be more precisely formed by a device capable of cutting a curved line.

Therefore, in the subsequent assembly of the grand piano, the surfaces 81a, 81b, 8 surrounding the frame 80 are formed.
If the 1e is used as a reference, the side left and right plates, the side plates, etc. can be assembled with the same high precision as in the conventional case where the surrounding surface of the column is used as a reference. Other configurations of the piano can be placed exactly.

Further, a pin plate 100 and a tuning pin 102 are provided on the casting body 80a in front of the piano,
A hitch pin 104 is provided on the casting body 80a behind the piano, and a string 106 is stretched between the tuning pin 102 and the hitch pin 104. A capodastro bar 108 is provided on the casting body 80a side in contact with the strings 106, and a piece 110 is provided on the soundboard 86 side.

This embodiment corresponds to the first embodiment, and its manufacturing method and effects are carried out except that there is a side plate mounting process peculiar to a grand piano or there is no master plate mounting process not found in a grand piano. Similar to Example 1. [Embodiment 4] FIG. 1 shows a frame 90 of another grand piano.
0 is shown. The main frame 90 includes a casting main body 90a and a cushioning material 90b attached to a side surface 90c thereof, and a surface 91 of the cushioning material 90b is cut and formed with high precision. The third embodiment is the taper surface 9 of the soundboard support fixing portions 92 and 94.
The difference is that 2a and 94a face upward.

This embodiment corresponds to the second embodiment, and its manufacturing method and effects are carried out except that there is a side plate mounting process peculiar to a grand piano or there is no master plate mounting process not found in a grand piano. Similar to Example 2. [Others] In each embodiment, the cushioning materials 4b, 54b, 8
Although 0b and 90b are made of wood, they may be made of plastic. Further, although the cushioning materials 4b, 54b, 80b, 90b are fixed to the casting bodies 4a, 54a, 80a, 90a with screws, they may be fixed with an adhesive, or fixed with screws and an adhesive. You may.

In the pianos of the above-mentioned respective embodiments, the columns and the striking are removed, but as another configuration, the soundboard is attached to the frame so that the striking is omitted, but for reinforcement of the piano. Alternatively, columns may be provided. In this case, the driving can be omitted and the material cost and processing
Since the assembling process can be omitted, the acoustic characteristics can be improved, the acoustic characteristics can be improved, and the manufacturing cost can be reduced with almost no deterioration in the acoustic characteristics.

The frames 4, 54, 80 and 90 are
The combination of the striking board and the soundboard may be the same as the conventional one, as long as it is configured only to save the columns. Further, the soundboard was screwed to the soundboard support fixing portion of the frame, but it may be attached with an adhesive instead of only with the screw, or may be attached with both the screw and the adhesive. .

Even if the frame is manufactured as a casting by a casting method such as the V process method, it is possible to attach the soundboard to the tapered surface of the soundboard supporting and fixing portion, but with respect to these tapered surfaces, In particular, secondary processing such as cutting may be performed in order to improve surface smoothness and dimensional accuracy.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of an upright piano according to an embodiment of the present invention.

FIG. 2 is a rear view of the frame.

FIG. 3 is a front view of the frame after stringing.

FIG. 4 is an explanatory view showing a mounting state of the cushioning material 4b to the casting body 4a.

FIG. 5 is a rear view of an integrated body of a frame and a soundboard.

FIG. 6 is a partial enlarged cross-sectional view of an integrated body of a frame and a soundboard.

FIG. 7 is a partially enlarged cross-sectional view of an integrated body of a frame and a soundboard of another embodiment.

FIG. 8 is a plan view of the frame of the grand piano of the embodiment of the present invention.

FIG. 9 is a partially enlarged cross-sectional view of an integrated body of the frame and the soundboard.

FIG. 10 is a partially enlarged sectional view of an integrated body of a frame and a soundboard of another embodiment.

FIG. 11 is a longitudinal sectional view of a main part of a conventional upright piano.

[Explanation of symbols]

2… Upright piano 4, 54, 80, 90…
Frame 4a, 54a, 80a, 90a ... Casting body 4b, 54b, 80b, 90b ... Buffer material 4c, 54c, 90c ... Side surface 4d, 54d, 81a, 81b, 81c, 81d, 81
e, 91 ... Surface 5 ... Wooden plate material 5a, 5b ... Screw through hole 6 ...
Main plate 11 ... After roof 12 ... Bottom plate 74 ... Soundboard support fixing part 74a ... Tapered surface

Claims (3)

[Claims] 1. A piano characterized in that wood or a plastic material is attached to a peripheral portion thereof, the surface of the wood or the plastic material is processed into a desired shape, and the reference surface is used for attaching other members of the piano. For frame. 2. A frame for an upright piano having a rectangular shape, wherein wood or plastic material is attached to the left and right sides of the frame, and the width between the outer surfaces of the left and right wood or plastic material is a desired width. As described above, each of the outer surfaces is cut into a flat surface to form a mounting surface for mounting a master plate. 3. A piano formed by using the piano frame according to claim 1 or 2 and omitting the support columns.