JP3400268B2 - Grand piano bending products - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bent product of a grand piano, which is bent so as to match the outer peripheral shape of the grand piano, and more specifically to a pile and a side plate.

[0002]

2. Description of the Related Art The loading of a grand piano constitutes a part of a back mechanism and also serves as a base to which side plates are attached. The side plates are bonded along the outer circumference of the loading and form a part of the exterior. Yes, each has a curved shape that matches the outer peripheral shape of the grand piano.

Conventional stacking and side panels are generally formed by stacking and bonding a plurality of wood veneers. In addition, since the construction is basically the same for such loading and side plates, hereinafter, on behalf of these,
A conventional loading configuration will be described with reference to FIG. As shown in FIG. 3A, the wood veneers constituting the loading 11 are composed of a predetermined number of A-type wood veneers 11a and B-type wood veneers 11b, respectively. It is designed to be stacked.

The A type wood veneer 11a is made of a single continuous rotary veneer, which is made by laminating lauan or the like so that the grain of wood extends in the lengthwise direction of the stack 11, and has a continuous rotary veneer. It is about 3 mm. On the other hand, the B type wood veneer 11b is a plurality of veneer materials 11 obtained by cutting a wood veneer having the same material and thickness as the A type into a predetermined length.
It has a divided structure in which c is arranged in the longitudinal direction of the stack 11. In this case, the grain of each veneer 11c is orthogonal to the grain of the A type wood veneer 11a, that is, loading 1
1 to extend in the width direction. Further, the space between the seams of the two adjacent single plate members 11c, 11c is temporarily fixed with a paper tape or the like not shown. Then, these two types of wood veneers 11a and 11b are alternately stacked while applying an adhesive, and are pressed by a press molding machine (not shown) to obtain a thickness as shown in FIG. It is bent and formed into a curve-shaped pile 11 having a length of about 45 mm.

As described above, the loading 11 is made up of two types of wood veneers 11a and 11b of A and B. First, the wood veneer of type A whose wood grain extends in the longitudinal direction of the loading 11 is used. This is because the use of 11a ensures the bending strength when the pile 11 is bent. On the other hand, since only the A-type wood veneer 11a has too high bending rigidity, bending defects are likely to occur particularly in a portion of the stack 11 where the curvature is large. By using the wood veneer 11b together, the bending rigidity is reduced,
This is to facilitate bending. The B type wood veneer 11b is divided into a plurality of veneers 11c for the same reason.

[0006]

However, the above-mentioned conventional loading 11 uses a wood veneer having a high unit price as a constituent plate material, so that the material cost increases. For the B type wood veneer 11b, the wood veneer is cut into a plurality of veneers 11c having a predetermined length and arranged, and the veneers 11c, 11c are pre-fixed with a paper tape or the like. However, since the processing cost is increased, the manufacturing cost of the whole loading 11 becomes high. This also applies to a conventional side plate configured similarly to the loading / unloading 11.

The present invention has been made to solve the above problems, and provides a bent molded product of a grand piano which can reduce the manufacturing cost while ensuring good bending moldability. The purpose is to

[0008]

In order to achieve this object, the present invention comprises a plurality of wooden boards stacked and adhered to each other and bent and formed to match the outer peripheral shape of the grand piano. A bent molded product of a grand piano, in which at least one wood board among a plurality of wood boards is made up of three or more wood veneers.
1 piece by pasting so that the eyes are perpendicular to each other
It is characterized in that it is made of plywood that has been formed in advance as the board .

According to the bent molded product of the grand piano, at least one of the plurality of wood plate materials constituting the grand piano is made of plywood. Therefore, for example, a commercially available plywood is used. As a result, the material cost is reduced as compared with the conventional case where all the wood boards are made of wood veneer. Further, since plywood is originally formed by stacking wood grains so that they intersect with each other, it has a certain degree of bending strength and is better than wood veneer when the wood grains extend in the length direction of the bent molded product. , The bending rigidity is small. Therefore, by constructing at least one of the plurality of wood board materials from plywood, the bending rigidity can be reduced accordingly, and good bendability can be obtained. As a result, it becomes possible to make a wooden board material by simply cutting the plywood into a predetermined size, and pre-processing such as cutting and temporary fixing of the single board material 11c which is performed when manufacturing the conventional loading 11 is unnecessary. Therefore, the processing work can be simplified and the processing cost can be reduced accordingly.

In this case, it is preferable that all of the plurality of wood board materials are made of plywood.

In this structure, as a plurality of wood board materials,
Since all plywood is used, material and processing costs can be significantly reduced.

In these cases, the plywood has one core veneer in which the wood grain extends in a direction orthogonal to the direction along the outer periphery of the grand piano, and each has a thickness smaller than the core veneer. However, it is preferable that the core veneer is composed of two veneer for makeup, which are adhered to the front and back surfaces of the core veneer and have wood grain extending in a direction along the outer periphery of the grand piano.

According to this construction, the plywood is a three-ply plywood consisting of one core veneer and two front and back veneer veneers. Such a 3-ply plywood is particularly common among commercially available plywoods and is inexpensive and easily available, so that a bent molded product can be manufactured at a lower cost. In addition, since the wood grain of each thin decorative veneer extends in the direction along the outer periphery of the grand piano, the required bending strength is ensured and the core with a larger thickness than the veneer for decorative use is secured. The veneer wood for wood extends in a direction orthogonal to the direction along the outer circumference of the grand piano,
Since the flexural rigidity is reduced to a high degree, good bendability can be obtained.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 2 shows loading of a grand piano to which the present invention is applied before and after bending. As shown in FIG. 1A, this loading 1 is a plurality of sheets (for example, 15 sheets) stacked on each other.
It is composed of wood board material 2 (only four are shown).

As shown in FIG. 1, each wood board 2 is made of 3-ply plywood such as lauan, that is, 1
A single veneer plate 2a for core and two pieces respectively attached to the front and back
It is constituted by a single sheet of decorative veneer 2b, 2b.
For example, the thickness ta of the core veneer 2a is 2.0 mm, the thickness tb of each decorative veneer 2b is 0.5 mm, and the total thickness t of one plywood is 3.0 mm.

The core veneer 2a and the decorative veneer 2b are also provided.
Consists of rotary veneers, each decorative veneer 2b
The grain of wood extends in the length direction of the stack 1, whereas the grain of the core veneer 2a extends orthogonally thereto, that is, in the width direction of the stack 1. Plywood with the above configuration is also commercially available, inexpensive, easily available,
The wood board 2 can be formed inexpensively and easily only by cutting such a plywood into a predetermined size.

Then, the plurality of wood board members 2 having the above structure are
In a state where they are stacked while applying an adhesive, they are inserted between the molds of a press molding machine (not shown) and pressed to have a curved shape that matches the outer peripheral shape of the grand piano, as shown in FIG. It is bent and formed into a pile 1 having a thickness of about 45 mm.

As described above, in the loading 1 according to the present embodiment, since the wooden boards 2 which are the constituent boards thereof are all made of 3-ply plywood, they are all made of wood veneer. The material cost can be significantly reduced compared to the loading. Moreover, in this plywood, the required bending strength is ensured because the grain of the makeup veneer 2b having a small thickness extends in the length direction of the stack 1. Furthermore, since the wood grain of the core veneer 2a, which is thicker than the veneer veneer 2b, extends in the direction orthogonal to the veneer veneer 2b, the flexural rigidity is reduced to a high degree, and thus good bendability is obtained. Therefore, the bending failure of the loading 1 does not occur even at a portion having a large curvature such as the points A, B and C in FIG. As a result, it becomes possible to make the wood board 2 simply by cutting a commercially available plywood into a predetermined size, and preprocessing such as cutting and temporary fixing of the single board 11c that was performed when the conventional loading 11 was manufactured. Since it is unnecessary, the processing cost can be reduced by that much by simplifying the processing work, and the manufacturing cost of the unloading 1 can be significantly reduced in addition to the reduction of the material cost.

A pillar, a frame, and a soundboard (none of which are shown) are attached to the bending-formed stack 1, and the back mechanism of the grand piano is constituted by these, as shown in FIG. Along the outer peripheral surface of the stack 1, side plates 3 having a similar curved shape are adhered. The side plate 3 has a thickness of, for example, about 20 mm, and although not shown, it is composed of a plurality of (for example, 7) wooden plate materials made of plywood with 3 plies and 3 mm thickness, as in the above-mentioned loading 1. And
By stacking these and bending-forming with a press molding machine, they are manufactured separately from the stack 1. Therefore, also for the side plate 3, it is possible to obtain the same effect as that of the loading 1 described above.

If necessary, in order to compensate for the insufficient precision of bending by the press molding machine, the adhesive surface between the stack 1 and the side plate 3, for example, the outer peripheral surface of the stack 1, is cut by a moulder. Be seen. In addition, in order to omit such moulding, the loading 1 and the side plate 3 may be simultaneously bent and formed.

The present invention is not limited to the embodiments described above and can be implemented in various ways. For example, in the embodiment, the plurality of wood boards constituting the loading and the side boards are all made of plywood, but within the range that satisfies the bending strength and bending rigidity required for the loading and the side boards A part of the wood board material may be plywood and the rest may be wood veneer as in the conventional case, whereby the material cost can be reduced by replacing plywood. Further, the number of plywoods, the thickness of each plywood, and the stratigraphy and each thickness of the core veneer and the decorative veneer constituting the plywood can be similarly changed appropriately. In addition, the detailed configuration and the like can be changed without departing from the spirit of the present invention.

[0022]

As described above, the bending-molded products such as the piled up and side plates of the grand piano of the present invention have an effect that the manufacturing cost can be reduced while ensuring good bending moldability. Have.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing a wooden board material that constitutes loading according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state before and after bending forming of a pile manufactured by using a plurality of wood board materials in FIG.

FIG. 3 is a plan view showing a state in which a side plate is attached to the loading of FIG.

FIG. 4 is a perspective view similar to FIG. 2 of conventional loading.

[Explanation of symbols]

1 loading 2 Wood board 2a core single plate 2b Veneer 3 side plates

Claims (3)

(57) [Claims] 1. A bent molded product of a grand piano, which is formed by stacking and adhering a plurality of wood boards to each other and is bent so as to conform to the outer peripheral shape of the grand piano. At least one of the wood boards is made up of three or more wood veneers whose wood grain is directly
One board by sticking together
A bent molded product of a grand piano, which is characterized by being made of plywood that has been formed in advance . 2. The bent molded product of the grand piano according to claim 1, wherein all the wooden boards of the plurality of wooden boards are made of plywood. 3. The plywood has one core veneer in which wood grain extends in a direction orthogonal to a direction along the outer periphery of the grand piano, and each has a thickness smaller than the core veneer. ,
It is characterized in that it is constituted by two makeup veneers that are adhered to the front and back surfaces of the core veneer and have wood grain extending in a direction along the outer periphery of the grand piano.
A bent molded product of the grand piano according to claim 1.