JPH11184457A - Keyboard of keyboard musical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display the same functions as lead by using a weight member of a material having large specific gravity other than lead as an environmental countermeasure. SOLUTION: A recessed part 20 is formed in the reverse surface of the front end part of the keyboard 1. The weight member 23 formed of the material having large specific gravity other than lead is fitted in the recessed part 20. The weight member 23 is formed of, for example, alloy of iron, copper pyrite, etc., sintered alloy, synthetic resin, or their compound material. In the reverse surface of the weight member 23, a pin hole 24 into which a front pin is freely slidably inserted is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard for a keyboard instrument.

[0002]

2. Description of the Related Art In general keyboard instruments such as pianos and electronic pianos, the weight of key touches during a performance causes the player to feel a subtle difference in the sense of touch and has a great psychological effect on the performance. It is required that the weight of the key touch be uniform for all keys or for each range. The weight of the key touch is adjusted in principle according to each player's preference, but is actually set to a standard weight when the musical instrument is manufactured.

As a method of adjusting the key touch, in the case of a piano keyboard, as shown in FIGS. 4 and 5, a diameter 1 penetrating through both sides of the keyboard 1 closer to the front end than the pivot point O of the keyboard 1 is shown.
A required number of weight through holes 2 of about 0 mm are formed at appropriate intervals in the longitudinal direction of the keyboard 1, and a cylindrical weight 3 is fitted into the weight through hole 2. Lead is used as the material of the weight 3. The reason for using lead is that it has a large specific gravity and is flexible, and when pressed by the pressurizing means (bit) 4, the outer peripheral portions at both ends thereof are deformed outward and cut into the hole wall of the weight through hole 2, the weight is reduced. This is because it is possible to prevent falling off from the through hole 2 for use. Reference numeral 5 denotes an action mechanism for striking a string. When a capstan screw 6 protruding from a rear end of the upper surface of the keyboard 1 pushes up the string when the key is pressed, the hammer 7 strikes the string corresponding to the keyboard 1. Is configured. Reference numeral 8 denotes a balance key pin for swingably supporting the keyboard 1, reference numeral 9 denotes a front pin for restricting movement of the keyboard 1 in the left-right direction, and reference numeral 10 denotes an upper surface material such as ivory or acrylic resin covering the front and upper front ends of the keyboard 1. is there.

[0004]

The lead used as the material of the weight 3 is inexpensive and has the largest specific gravity (11.34) among industrial metals, and is flexible and can be easily processed into any shape. The material is indispensable as a keyboard balancer because it can be easily press-fitted into the hole 2 and fixed. However, since lead is a heavy metal and is considered to be a harmful substance, it is desirable not to use lead for environmental protection, and there is a demand for conversion of the material.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. An object of the present invention is to use a weight member made of a material having a large specific gravity other than lead as an environmental measure, thereby reducing the use of lead. An object of the present invention is to provide a keyboard of a keyboard instrument capable of exerting equivalent functions.

[0006]

According to a first aspect of the present invention, a weight member having a pin hole into which a front pin is slidably inserted is formed of a material having a large specific gravity other than lead. And a concave portion formed at a front end of the lower surface of the keyboard at a position corresponding to the front pin. A second invention is characterized in that a front end portion of the keyboard corresponding to the front pin is formed of a weight member made of a material having a large specific gravity other than lead. The third invention is the first invention.
Alternatively, in the second invention, the weight member is formed of a metal, a sintered alloy, a synthetic resin, or a composite material thereof. According to a fourth aspect, in the second aspect, a pin hole through which the front pin is inserted is formed in the weight member.

In the present invention, a weight member formed of a material having a large specific gravity other than lead exhibits the same function as lead. The weight member is formed of a metal such as iron or brass, a sintered alloy (particularly an iron-based material), a synthetic resin, or a composite material thereof. The front pins restrict the movement of the keyboard in the left-right direction by being inserted into the pin holes. Therefore, the weight member functions as a guide member for the weight and pin.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a sectional view showing an embodiment in which the present invention is applied to a keyboard of a piano, and FIG. 2 is an exploded perspective view of a main part of the keyboard and a weight member. The same components as those shown in the section of the prior art are denoted by the same reference numerals, and the description thereof will be omitted as appropriate. In these figures, an oval concave portion 20 which is long in the longitudinal direction of the keyboard 1 is formed at a position corresponding to the front pin 9 at the front end of the lower surface of the keyboard 1, and cutouts are formed on both sides of the concave portion 20. 21 are formed. The shape of the recess 20 is an ellipse in order to avoid concentration of stress, but is not limited to this, and may be a rectangle, a hexagon, or the like. The notch 21 is formed in the width direction of the keyboard 1 so as to be orthogonal to the long axis of the recess 20, and the width (the length in the longitudinal direction of the keyboard) of the front pin punching 22 provided below the front pin 9. It is set slightly larger than the outer diameter.

Reference numeral 23 denotes a weight member to be fitted into the recess 20. The weight member 23 is formed of a material having a large specific gravity other than lead into an oval cylindrical body slightly smaller than the recess 20. After being inserted, it is fixed by an adhesive. A pin hole 24 is formed in the lower surface 23a exposed to the outside of the weight member 23 in a state where the pin member 24 is fitted in the concave portion 20.
And shallow grooves 25 are formed to be orthogonal to each other.
The pin hole 24 is formed so that the front pin 9 is slidably inserted therein. The pin hole 24 is formed in the center in the width direction of the weight member 23 to be long in the long axis direction, and the felt 26 is attached to both side walls. The groove 25 has the same width as the notch 21 and the weight member 2
3 over the entire width.

As a material of the weight member 23, for example, a metal, a synthetic resin, or a composite material thereof is used.
As a metal, iron (7.8) having a relatively large specific gravity is relatively inexpensive.
6), brass (8.3) or the like is used. When forming with iron, it is desirable to perform rust prevention treatment. As the synthetic resin, a fluorine resin or the like is used. In the case of a synthetic resin, if the weight member 23 is formed by filling a synthetic resin melted by injection molding, the fitting and bonding operations are unnecessary, and the falling out of the recess 20 can be prevented. Reference numeral 27 denotes a keyboard reed on which the front pins 9 and the balance key pins 8 (see FIG. 4) are planted.

In a keyboard having such a structure,
The weight member 2 is inserted into a recess 20 provided at the front end of the lower surface of the keyboard 1.
Since 3 is embedded, the weight of the keyboard 1 can be adjusted. Also, since it is embedded on the lower surface side of the keyboard 1, it is not visually recognized from the side, and the appearance of the keyboard 1 is not spoiled. Furthermore, since the weight member 23 is buried at a position farther from the fulcrum O than the conventional weight 3 shown in FIG. 4, even if the number of the weight members 23 is one, the weight member 23 itself is formed of a material having a lower specific gravity than lead. Can exert the same function as lead. In addition, since lead is not used, there is no risk of causing environmental problems, and it is very effective.

FIG. 3 is a perspective view of a main part of a keyboard showing another embodiment of the present invention. In this embodiment, a wooden keyboard body 30 shorter than a normal keyboard and a weight member 31 joined to the front surface of the keyboard body 30 by an adhesive or the like.
And the keyboard 32. The weight member 31 is formed of a metal, synthetic resin, or a composite material thereof having a large specific gravity other than lead, and has a pin hole 33 and a shallow groove 3 on the lower surface.
4 are formed. On the joint surface between the keyboard body 30 and the weight member 31, V-shaped grooves and ridges that mesh with each other are alternately formed in the thickness direction. Also in such a configuration, since the front end portion of the keyboard 32 is formed by the weight member 31, the same effect as in the above-described embodiment can be obtained.

In the above-described embodiment, an example in which the present invention is applied to a keyboard of a piano is shown. However, the present invention is not limited to this, and is applied to a keyboard of a keyboard instrument such as an electric piano or an electronic piano. It is also possible to apply.

[0014]

As described above, in the keyboard of the keyboard musical instrument according to the present invention, the weight member formed of a material having a large specific gravity other than lead is fitted into the concave portion formed at the front end of the lower surface of the keyboard or the keyboard. Since the front end portion is constituted by a weight member, there is no risk of causing environmental problems, the number can be reduced as compared with conventional weights, and mounting work is easy.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment in which the present invention is applied to a keyboard of a piano.

FIG. 2 is an exploded perspective view of a main part of the keyboard.

FIG. 3 is a perspective view of a main part showing another embodiment of the present invention.

FIG. 4 is a side view showing a keyboard of a conventional piano having a weight.

FIG. 5 is a sectional view of a keyboard.

[Explanation of symbols]

1 ... keyboard, 2 ... weight through hole, 3 ... weight, 4 ... bit,
5: Action mechanism, 9: Front pin, 20: Depressed portion, 23: Weight member, 24: Pin hole, 30: Keyboard body, 31: Weight member, 33: Pin hole.

Claims (4)

[Claims] A weight member having a pin hole into which a front pin is slidably inserted is formed of a material having a large specific gravity other than lead, and is formed at a front end of a lower surface of a keyboard corresponding to the front pin. A keyboard for a keyboard instrument, wherein the keyboard is fitted in a recess. 2. A keyboard for a keyboard instrument, wherein a front end portion corresponding to a front pin of the keyboard is formed of a weight member made of a material having a high specific gravity other than lead. 3. The keyboard for a keyboard musical instrument according to claim 1, wherein the weight member is formed of a metal, a sintered alloy, a synthetic resin, or a composite material thereof. 4. The keyboard for a keyboard musical instrument according to claim 2, wherein a pin hole through which a front pin is inserted is formed in the weight member.