JPH0926783A - Backpost unit of upright piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a backpost unit of upright piano which can consist of a small number of components and is easily machined and assembled without decreasing the strength and rigidity of the backpost unit. SOLUTION: This backpost unit 1 of upright piano is equipped with a rectangular lumber type base 2, two backposts 4 of which one end is fixed vertically to both end parts of the top surface of the base 2, and a pin plate 3 which holds embedded tuning pins fixed to the other end of each of the columns 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pillar unit for an upright piano.

[0002]

2. Description of the Related Art FIG. 7A is a side sectional view showing an example of a conventional upright piano, and FIG. 7B is a side sectional view showing a state in which a tuning pin is embedded at that time. In this upright piano, as shown in these figures, the pillar unit 101 is composed of a base 2, a pillar 4 (and a middle pillar 5), a girder 40, a box 41 and a girder stick 42, and the upper end of the pillar unit 101. A pin plate 103 is attached to the front surface of the part. A batting 109 having an inclined front surface is attached to the lower portion of the soundboard 12 in order to give a sound to the soundboard 12, and the soundboard 12 having the soundbar 13 and the long piece 14 (and the short piece 15) adhered thereto is attached to the front surface thereof. It is installed.
Further, on the front surface thereof, the frame 20 is provided with the pin plate 1 described above.
In a state of being adhered to 03, the tuning pin 21 is attached to the strut unit 101, the tuning pin 21 is embedded in the pin plate 103 from the front side of the frame 20 through the frame 20, and between the tuning pin 21 and the hitch pin 22, The string S is stretched through the piece pin 23.

As is clear from this example, since the tuning pin 21 is usually subjected to a strong force such as the tension of the string S, the pin plate 103 is made of a hard material such as maple wood, beech wood or plywood thereof. It is made of a sturdy wooden member and has a thickness sufficient to fix and support the tuning pin 21. Therefore, the column unit 10
1 is required to have strength to support the pin plate 103 and withstand the tension of the strings. If the material and the structure of the strut unit 101 are not appropriate, the tension of the string S causes a deformation called “front bending” or “sledding” over time, resulting in the looseness of the string S and the resonance. The plucking of the plate 12 may cause a "descent" phenomenon, resulting in a piano with poor durability quality. That is, the support unit 101 includes a soundboard 12 that is the heart of the piano.
By firmly supporting and fixing the sound source, it has an important role of enabling rich sound to be obtained from the sound board 12. From this request, as described above, the strut unit 101 normally includes the base 2, the strut 4 (and the middle strut 5),
It is composed of a girder 40, a box 41, and a girder stick 42, which are firmly connected and a pin plate 103 is attached to them to secure sufficient strength and rigidity to meet the above-mentioned demand.

[0004]

However, in such a conventional strut unit 101, in order to maintain strength and rigidity, the strut 4, the girder 40, and the box 41 have a large thickness, and the front face thereof has a further thickness. Since the pin plate 103 with the ridge is fixed and supported, the distance between the string S and the column 4 is increased,
A thick material is also required for the percussion 109 for mounting the soundboard 12, which increases material cost and causes an excessive thickness as a whole, which increases the depth dimension of the piano, that is, the installation area. . In addition, as described above, the column unit 101 has a large number of constituent parts, and further requires an adhesive agent or bolts for joining them, resulting in a drawback that material cost and assembly cost thereof are increased. . Further, as shown in the figure, when a part of the upper portion of the support column 4 or the like is shaved and a pin plate 103 is attached to the portion, the thickness is slightly reduced, but the strength of the support column 4 or the like is reduced. Let
In addition, there is a drawback that machining cost is further required for cutting.

The present invention has been made in order to solve such a problem, and can be constructed with a smaller number of parts without lowering the strength and rigidity of the column unit, and can be processed and processed. It is an object of the present invention to provide a column unit for an upright piano that can be easily assembled.

[0006]

In order to achieve the above-mentioned object, an upright piano strut unit according to the present invention comprises a square-shaped base and two ends vertically fixed to both upper end portions of the base. It is characterized in that it is provided with struts and a pin plate fixed to the other ends of these struts for embedding and holding tuning pins.

[0007]

The strut unit of the upright piano according to claim 1 is constituted by only the base, the pin plate and the strut by using the pin plate for embedding and holding the tuning pin as a basic constituent member of the strut unit. Therefore, the number of constituent parts can be reduced, and the processing / assembly cost can be reduced. In this case, since the pin plate is originally made of a hard and sturdy wooden member in order to sufficiently support the tension of the strings, even if the number of parts is reduced as described above, it is not enough as a strut unit. It is possible to secure sufficient strength and rigidity.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the drawings. In the following description, elements or parts given the same reference numerals have the same configurations and functions unless otherwise specified, and duplicate explanations are omitted.

FIG. 1 is a perspective view of a column unit according to an embodiment of the present invention, and FIG. 2 is a rear view thereof.

As shown in these figures, the column unit 1
Is composed of a base 2, a pin plate 3, a support 4, a middle support 5, a handle 6 and casters 7. The base 2 is a wooden lumber such as “spruce”, “rawan”, “hemlock”, “calofilm” or the like, or laminated plywood thereof, and serves as a base member of the pillar unit 1. At both ends of the upper surface of the base 2, two columns 4 made of the same material as the base 2,
One end is fixed by an adhesive agent, a bolt, or both so as to be perpendicular to the base 2. Similarly to the pillar 4, the four middle pillars 5 are also fixed to the upper surface of the base 2 at regular intervals, and a handle 6 is attached between the outer two middle pillars 5 and the pillar 4. The pin plate 3 is a "maple",
It is a solid wood member such as muku such as "beech" or plywood thereof, and is attached to the upper ends of the support pillar 4 and the middle support pillar 5 vertically with them and parallel to the base 2, using the fixing bolt 8 and the adhesive together. It is fixed. On the lower surface of the base 2, casters 7 for facilitating the movement of the pillar unit 1 as well as the handle 6 are attached.

FIG. 6 (a) is a side sectional view of an upright piano using the strut unit 1 of this embodiment, and FIG. 6 (b) is a side sectional view showing a state in which a tuning pin is embedded at that time.

This upright piano is basically assembled by the procedure shown below, and has a structure as shown in these figures. First, the pillar unit 1 is assembled from the base 2, the pin plate 3, the pillar 4, the middle pillar 5, the handle 6, the caster 7, etc. as described above (see FIGS. 1 and 2). A batting 9 having an inclined front surface is attached to the front surface of the strut unit 1 in order to give a sound to the soundboard 12.
After attaching the echo bars 10 and 11 (see FIG. 3), the sound board 12 to which the sound bar 13 and the long piece 14 (and the short piece 15) are attached is attached to the front surface of the batting 9 (FIG. 4).
reference). Further, the frame 20 is attached to the front surface of the soundboard 12 with the upper part adhered to the pin plate 3, and the tuning pin 21 is embedded in the pin plate 3 from the front side of the frame 20 via the frame 20 (see FIG. b)), and the string S is stretched between the hitch pin 22 and the piece pin 23 (see FIG. 6).
(A)). As a result, the tuning pin 21
Since a strong force such as the tension of the string S is applied, the pin plate 3 is made of a hard and sturdy wood member as described above, and has a sufficient thickness to fix and support the tuning pin 21. Has been formed. Next, the main board 30, the shelf board, the keyboard is placed, the action is installed, the tuning and tuning are performed, and the roof (front roof, rear roof 31) is mounted (see FIG. 5), the upper front plate and the lower plate. The case material such as the front plate is attached, and after finishing the sound adjustment and inspection, the assembly is completed (see FIG. 6A).

As described above, the conventional strut unit 101 includes the base 2, the strut 4 (and the middle strut 5), and the girder 4.
0, the box 41, and the girder stick 42, and the pin plate 103 is added (see FIG. 7), while the constituent members of the strut unit 1 of this embodiment are basically the base 2, Since only the pin plate 3 and the support columns 4 (and the middle support columns 5) (see FIG. 6) can be omitted, the number of constituent parts is reduced by the amount that the girder 40, the box 41, and the girder sticking 42 can be omitted. Can be reduced. In this case, the conventional digit 4
0, box 41, girder stick 42 and pin board 103,
Even if the pin plate 3 is used alone, since the pin plate 3 is made of a hard and sturdy wood member as described above,
While taking advantage of the characteristics, it is possible to secure sufficient strength and rigidity as the column unit 1, and it is possible to reduce the number of joints between members that are likely to be weak points.

Further, in contrast to the conventional joint surface between the strut unit 101 and the pin plate 103, which is mainly the back surface of the pin plate 103 (see FIG. 7), the pin plate of the strut unit 1 of the present embodiment. The joint surface between the column 3 and the support 4 is the lower surface of the pin plate 3 (see FIG. 6). In the case of an upright piano, since the tension of the strings S acts in the vertical direction, the strut unit 1 of this embodiment having a horizontal joint surface is structurally advantageous over the conventional one. As a result, the strut unit 1 can secure a sufficient strength as compared with the conventional one, can increase the resistance against "front bending", and can reduce the deformation over time, thus improving the durability. be able to. As a result, in the upright piano using the strut unit 1 of the present embodiment, the soundboard 12 which is the heart of the piano is more firmly supported and fixed, so that the rich sound from the soundboard 12 is made permanent. This has the effect of facilitating.

Further, the pin plate 3 is attached to the tuning pin 2
Even if formed to have a thickness sufficient to support and fix 1 (see FIG. 6 (b) Ls, also FIG. 7 (b))
And the pin plate 3 toward the front of the pillar unit 1
The protrusion width (Lp in the figure) can be made smaller than in the conventional case, and the distance between the string S and the column 4 can be shortened. As a result, the thickness of the percussion 9 (Lu in the figure) is set to the soundboard 12
Since the thickness can be made to be the minimum necessary for giving the muffler, a thick material is not required, the material cost can be reduced, and the thickness (Ls in the figure) that gives the strut 4 sufficient strength can be obtained. Even if secured, the total thickness (Ls in the figure
Since + Lp) can be made smaller than in the conventional case, the depth dimension of the piano, that is, the installation area can be reduced.

The present invention is not limited to the embodiments described above and can be implemented in various modes. For example, in the pillar unit 1 of this embodiment, four middle pillars 5
6 pillars including the above, but with an emphasis on the resistance to "twisting" rather than the "front bending" described above, an X cross shape having an intermediate pillar crossed in an X shape between the two pillars 4. It may be a pillar, or two pillars may be formed by omitting the middle pillar by devising the frame 20 or the like. Further, in the present embodiment, the fixing bolt 8 and the adhesive are used together to attach the pin plate 3 to the support column 4, but depending on the required strength, nails, other joining hardware, and combinations thereof, etc. Various joining methods can be selected and joined. In addition, the detailed configuration, the mounting method, and the like can be appropriately changed without departing from the spirit of the present invention.

[0017]

As described above in detail, in the upright piano strut unit of the present invention, by utilizing the hard and tough material of the pin plate and utilizing the pin plate as a basic constituent member of the strut unit, The unit has a smaller number of parts without lowering the strength and rigidity of the unit, and has the effects of facilitating processing and assembly.

[Brief description of drawings]

FIG. 1 is a perspective view of a column unit according to an embodiment of the present invention.

FIG. 2 is a rear view of the column unit according to the embodiment of this invention.

FIG. 3 is a view showing a strut unit of an embodiment of the present invention to which a driving member is attached.

FIG. 4 is a rear view of the column unit after the soundboard of the embodiment of the present invention is attached.

FIG. 5 is a rear view of the assembly of the embodiment of the present invention after mounting the main plate and the roof.

6A is a side sectional view of an upright piano according to an embodiment of the present invention, and FIG. 6B is a side sectional view showing a state in which a tuning pin is embedded at that time.

7A is a side sectional view showing an example of a conventional upright piano, and FIG. 7B is a side sectional view showing a state in which a tuning pin is embedded at that time.

[Explanation of symbols]

 1 Support unit 2 Base 3 Pin board 4 Support

Claims (1)

[Claims] 1. A square-shaped base, two columns whose one end is vertically fixed to both ends of an upper surface of the platform, and a tuning pin fixed to the other ends of these columns, which are embedded and held. A support unit for an upright piano, which is provided with a pin plate for.