JP3320936B2 - Piano keys - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a piano keyboard.
Particularly, the present invention relates to an improvement in a center seat plate attached to an acoustic piano or the like to reinforce a keyboard body.

[0002]

2. Description of the Related Art FIG. 3 shows a central portion of an example of a keyboard of a conventional acoustic piano such as a grand piano or an upright piano. The keyboard 51 is composed of the keyboard body 5
2 and a middle seat plate 5 bonded to the upper surface of the central portion of the keyboard body 52
3 is provided. A balance pin hole 54 is formed from the keyboard main body 52 to the middle seat plate 53 so as to penetrate them vertically.
Is passed through a balance pin 57 erected in a reed 56 fixed to the reed 55, so that the keyboard 51 is swingably supported. The keyboard body 52 is made of relatively light and resilient softwood such as spruce and pine, whereas the middle seat plate 53 is made of harder hardwood such as beech or maple. The keyboard body 52 is reinforced by the middle seat plate 53 to prevent deformation of the balance pin hole 54 due to long-term use.

[0003]

However, in the conventional keyboard 51, since the middle plate 53 such as beech or maple is expensive, the material cost of the middle plate 53 increases. However, there is a disadvantage that the manufacturing cost of the keyboard 51 is increased. In addition, the middle seat plate 53 made of beech, maple, or the like has a limit in strength as a woody material. Therefore, in order to secure required strength, its thickness must be increased to some extent. In some cases, the degree of freedom in the layout of the keyboard device may be limited due to interference with other components.

SUMMARY OF THE INVENTION The present invention has been made to solve this problem, and a piano having a reduced space and a reduced cost can be achieved by reducing the thickness of the intermediate plate and significantly reducing the material cost. It is intended to provide a keyboard.

[0005]

In order to achieve this object, a keyboard of a piano according to the present invention comprises a keyboard body pivotally supported at a central portion, and an upper surface at a central portion thereof for reinforcing the keyboard body. And a middle seat plate attached to the base member, and the middle seat plate is formed of a resin-impregnated sheet.

[0006]

In this keyboard, the resin-impregnated sheet constituting the middle seat plate is extremely inexpensive as compared with the conventional beech or maple boards, so the material cost of the middle seat plate is greatly reduced. Accordingly, the manufacturing cost of the keyboard is reduced. Also,
By using a resin-impregnated sheet with a higher strength than a conventional wood board, it is possible to secure the required strength of the middle seat plate with a smaller thickness than before, so that,
The thickness of the keyboard is reduced, and the space of the keyboard can be saved.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows a keyboard device including a keyboard (white key) of an upright piano to which the present invention is applied. As shown in FIG. 1, the keyboard 1 includes a keyboard body 2, a middle seat plate 3 bonded to a central portion of the upper surface of the keyboard body 2, and a keyboard body 2.
A keyboard skin 4 adhered to the front upper half of the upper surface and front end portions of both side surfaces, and a front seat plate 5 adhered to the upper rear end of the keyboard main body 2 are provided.

The keyboard body 2 is made of a relatively light, tenacious and resilient softwood such as spruce and pine. A front pin hole (not shown) for preventing left and right swing of the keyboard 1 is formed at a front portion of the keyboard main body 2 so as to open to a lower surface.

The middle seat plate 3 according to the present invention is used to reinforce the keyboard body 2, and is impregnated with a relatively high-strength resin such as a backer sheet or a melamine sheet in which a thermosetting resin is impregnated in paper. It is made of paper. A balance pin hole 6 is formed from the keyboard main body 2 to the middle seat plate 3 so as to penetrate them vertically. As shown in FIG. 1, the balance pin hole 6 includes a round hole 6a at the lower end of the keyboard main body 2 and a long guide hole 6b that is long in the front-rear direction above the round hole 6a.

The keyboard skin 4 is made of acrylic or the like. In addition, the front seat plate 5 is made of beech or maple,
A capstan button 7 is provided upright on the upper surface.

In the keyboard 1 constructed as described above, the balance pin hole 6 is formed in the balance pin 9
Then, a front pin hole (not shown) is passed through a front pin 11 erected in front of the reed 10 to be attached. The reed 8 and the reed 10 are embedded in the reed 12 and fixed. Thus, the keyboard 1 is supported swingably around the balance pin 9 while being guided by the balance pin 9 and the front pin 11. In the key release state, the rear portion of the keyboard 1 rests on the keyboard pillow 14 provided on the rear part 13 of the reed, and its downward rotation is regulated. When the capstan button 7 pushes up a whippen (not shown), an action (not shown) is activated. In this case, the middle seat plate 3 serves to reinforce the keyboard body 2 which is pressed with a strong force and to prevent the balance pin hole 6 from being deformed due to long-term use.

It should be noted that between the keyboard 1 and the reed 8 and the keyboard 1
A balance punching 15 for adjusting the height of the keyboard 1 is provided between the reed 10 and the front 10. A bushing cloth (not shown) is attached to inner surfaces of the balance pin hole 6 and the front pin hole in order to make the keyboard swing smoothly and to prevent noise.

As described above, in the keyboard 1 of the present embodiment, the middle seat plate 3 is made of a high-strength resin-impregnated paper such as a backer sheet or a melamine sheet, so that it is apparent from a comparison between FIG. 1 and FIG. In this way, the required strength of the middle seat plate 3 can be secured with a thickness much smaller than that of the related art. As a result, the keyboard 1 is made compact in the vertical direction, space is saved, and the degree of freedom in layout of the keyboard device can be improved.

Further, the resin-impregnated paper constituting the middle seat plate 3 is
Compared to conventional wood boards such as beech and maple, it is extremely inexpensive. For example, it can be obtained at a price of 1/8, so that the material cost of the middle seat plate 3 can be greatly reduced, and the production of the keyboard 1 correspondingly. Costs can be reduced.

In this embodiment, the resin-impregnated paper is used as the resin-impregnated sheet. Instead, an appropriate resin-impregnated cloth having high strength can be used. The embodiment is an example of an upright piano keyboard.
Of course, it is also possible to apply the invention to other suitable types of piano keys, such as grand pianos.

[0016]

As described above, the keyboard of the piano according to the present invention has effects such as space saving and cost reduction by reducing the thickness of the middle seat plate and greatly reducing the material cost. Have.

[Brief description of the drawings]

FIG. 1 is a partially enlarged side view showing a main part of a keyboard of an upright piano to which the present invention is applied.

FIG. 2 is a perspective view showing a keyboard device including the keyboard of FIG. 1;

FIG. 3 is a partially enlarged side view similar to FIG. 1 of a conventional keyboard.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Keyboard 2 Keyboard body 3 Middle seat plate

Claims (1)

(57) [Claims] 1. A keyboard body pivotally supported at a central portion, and a middle seat plate attached to an upper surface of the central portion to reinforce the keyboard body, wherein the middle seat plate is impregnated with resin. A piano keyboard characterized by being composed of sheets.