JPH08202347A - Keyboard of piano - Google Patents

Abstract

PURPOSE: To enable the reduction of the thickness of a middle plate and the material cost thereof and to reduce a space and cost by providing the keyboard with a specific keyboard body and middle plate and composing the middle plate of a resin-impregnated sheet. CONSTITUTION: The middle plate 3 of the keyboard 1 is composed of the resin- impregnated paper, such as backer sheet or melamine sheet, having high strength and, therefore, the required strength of the middle plate 3 is assured with the thickness smaller than heretofore. Consequently, the keyboard 1 is made compact in a vertical direction, by which the space is saved and the degree of freedom in the layout of the keyboard device is improved. The resin-impregnated paper constituting the middle plate 3 is more inexpensive than the conventional solid wood board of beeches, maples, etc., and is available to obtain at a cost of, for example, 1/8 the costs of the conventional plates and, therefore, the material cost of the middle plate 3 is reduced. The production cost of the keyboard 1 is correspondingly reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piano keyboard,
Particularly, in an acoustic piano or the like, the present invention relates to improvement of a middle seat plate attached to a keyboard body for reinforcing the 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. This keyboard 51 is the keyboard body 5
2 and the intermediate seat plate 5 adhered to the upper surface of the central portion of the keyboard body 52
3 is provided. Balance pin holes 54 are formed from the keyboard main body 52 to the middle seat plate 53 so as to penetrate therethrough in the vertical direction.
The keyboard 51 is swingably supported by letting the balance pin 57, which is erected on the reed 56 fixed to the reed 55, stand upright. The keyboard body 52 is made of relatively lightweight and highly elastic softwood such as spruce or pine, while the middle seat plate 53 is harder than this, such as hardwood, such as beech or maple. The center seat plate 53 reinforces the keyboard body 52 to prevent the balance pin hole 54 from being deformed due to long-term use.

[0003]

However, in the conventional keyboard 51, since the beech and maple forming the middle seat plate 53 are expensive, the material cost of the middle seat plate 53 is high, and the cost is high. The disadvantage is that the manufacturing cost of the keyboard 51 is increased. Further, since the middle seat plate 53 made of beech, maple, etc. has a limit in strength as a wooden material, its thickness must be increased to some extent in order to secure the required strength. In some cases, the degree of freedom in the layout of the keyboard device may be limited due to interference with other components.

The present invention has been made in order to solve this problem, and it is possible to reduce the space and cost of a piano by reducing the thickness of the middle seat plate and greatly reducing the material cost. The purpose is to provide a keyboard.

[0005]

In order to achieve this object, the keyboard of the piano of the present invention comprises a keyboard main body which is swingably supported at the central portion, and an upper surface of the central portion for reinforcing the keyboard main body. And a middle seat plate attached to the middle seat plate, which is made of a resin-impregnated sheet.

[0006]

In this keyboard, the resin-impregnated sheet forming the middle seat plate is much cheaper than the conventional muku plates such as beech and maple, so the material cost of the middle seat plate is greatly reduced. The keyboard manufacturing cost is reduced accordingly. Also,
By using a resin-impregnated sheet having a higher strength than the conventional wood board, it becomes possible to secure the required strength of the middle seat board with a smaller thickness than the conventional one.
The thickness of the keyboard is reduced, and the keyboard space can be saved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows a keyboard device including an upright piano keyboard (white keys) to which the present invention is applied. As shown in FIG. 1, the keyboard 1 includes a keyboard body 2, an intermediate seat plate 3 adhered to a central portion of an upper surface of the keyboard body 2, and a keyboard body 2.
The keyboard skin 4 bonded to the front half of the upper surface and the front ends of both side surfaces, and the front seat plate 5 bonded to the rear end of the upper surface of the keyboard body 2.

The keyboard body 2 is made of a softwood such as spruce or pine, which is relatively lightweight, tenacious and highly elastic. A front pin hole (not shown) for preventing the keyboard 1 from swinging left and right is formed in the front portion of the keyboard body 2 so as to open to the lower surface.

The intermediate seat plate 3 according to the present invention is for reinforcing the keyboard body 2, and is impregnated with a resin having relatively high strength such as a backer sheet or a melamine sheet in which paper is impregnated with a thermosetting resin. It is made of paper. A balance pin hole 6 is formed so as to penetrate the keyboard body 2 and the middle seat plate 3 in the vertical direction. As shown in FIG. 1, the balance pin hole 6 is composed of a round hole portion 6a at the lower end of the keyboard body 2 and a guide elongated hole portion 6b above the round hole portion 6a and long in the front-rear direction.

The keyboard skin 4 is made of acrylic or the like. The seat plate 5 is made of beech or maple,
A capstan button 7 is erected on its upper surface.

In the keyboard 1 constructed as described above, the balance pin hole 6 is erected on the balance pin 9 provided upright in the reed 8.
Then, the front pin holes (not shown) are inserted into the front pins 11 provided upright on the reed 10 respectively to be attached. The reed inside 8 and the reed front 10 are embedded and fixed in the reed 12. As a result, the keyboard 1 is supported swingably around the balance pin 9 while being guided by the balance pin 9 and the front pin 11. Further, in the key released state, the rear portion of the keyboard 1 is placed on the keyboard pillow 14 provided on the rear 13 of the reed and its downward rotation is restricted, while the rear portion of the keyboard 1 is pushed up by the key depression, The action (not shown) is activated by the capstan button 7 pushing up the wippen (not shown). In this case, the middle seat plate 3 reinforces the keyboard body 2 that is pressed with a strong force, and prevents the balance pin hole 6 from being deformed due to its long-term use.

Between the keyboard 1 and the reed 8 and the keyboard 1
Balance punching 15 for adjusting the height of the keyboard 1 is provided between the reed and the front of the reed 10. A bushing cloth (not shown) is attached to the inner surfaces of the balance pin hole 6 and the front pin hole in order to smooth the swing of the keyboard and prevent noise.

As described above, in the keyboard 1 of this embodiment, since the intermediate seat plate 3 is made of a resin-impregnated paper having a high strength such as a backer sheet or a melamine sheet, it is clear from the comparison between FIG. 1 and FIG. As described above, the required strength of the intermediate seat plate 3 can be secured with a much smaller thickness than the conventional one. As a result, the keyboard 1 becomes compact in the vertical direction, space saving is achieved, and the degree of freedom in the layout of the keyboard device can be improved.

Further, the resin-impregnated paper forming the middle seat plate 3 is
It is much cheaper than conventional wood boards such as beech and maple, and can be obtained at a price of, for example, 1/8. Therefore, the material cost of the intermediate seat board 3 can be greatly reduced, and the keyboard 1 can be manufactured accordingly. The cost can be reduced.

In this embodiment, the resin-impregnated paper is used as the resin-impregnated sheet, but an appropriate resin-impregnated cloth having high strength can be used instead of this. In addition, although the embodiment is an example of an upright piano keyboard,
It is of course possible to apply the invention to keyboards of other suitable types of pianos such as grand pianos.

[0016]

As described above, the piano keyboard according to the present invention has effects such as space saving and cost reduction due to the thinness of the intermediate seat plate and the significant reduction in material cost. Have.

[Brief description of 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.

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

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

[Explanation of symbols]

 1 keyboard 2 keyboard body 3 middle plate

Claims (1)

[Claims] 1. A keyboard main body that is swingably supported at a central portion, and an intermediate seat plate attached to the upper surface of the central portion to reinforce the keyboard main body, and the intermediate seat plate is impregnated with resin. A piano keyboard characterized by being made up of sheets.