JP2017044989A - Keys of keyboard instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide keys of a keyboard instrument that have weights hardly dropping.SOLUTION: A key of a keyboard instrument includes: a key body part 3 having a hole part 30; a weight part capable of being elastically deformed; a protruded dropping prevention part 32 formed in the hole part 30; and a displacement preventing part 34 whose height is lower than that of the dropping prevention part 32. Once the weight part is pushed into the hole part 30 of the key body part 3, the weight part is not only prevented due to stretching in the hole part 30 from being removed, but also prevented by the dropping prevention part 32 from being removed. Furthermore, since the dropping prevention part 32 has a height which the weight part can cross if the weight part is elastically deformed, the weight part is pushed into the hole part 30 smoothly without being obstructed by the dropping prevention part 32. Vertical backlash of the weight part is suppressed by biting of the displacement preventing part 34.EFFECT: In the key of the keyboard instrument, since anti-removal is performed in multiple ways, the weight part is prevented from dropping from the key body part 3 and the vertical backlash is suppressed.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a key of a keyboard instrument.

  The key of the plastic electronic piano has a box shape with an opening at the bottom for easy molding, and ribs are provided where necessary to give strength. For this reason, a plurality of holes are formed in the lower surface of the key.

  An invention is disclosed in which a weight is attached to a key using this hole to adjust the touch feeling of the key (see, for example, Patent Document 1). The weight described in Patent Document 1 is formed entirely of an elastic material such as rubber, and includes a main body portion formed in a rectangular parallelepiped shape and a plurality of fold portions provided on the main body portion. Yes. Of these, the folds are arranged side by side along the direction of pushing into the hole on a pair of side surfaces located on opposite sides of the side of the main body along the direction of pushing into the hole.

  The weight configured as described above is cut by adjusting the size so that the weight matches the touch feeling of each key, and is pushed into the hole of the key. At the time of this pushing, the fold portion bends in the direction opposite to the pushing direction. Therefore, the weight is stretched in the hole by the restoring force due to the bending, and is prevented from coming off from the hole.

JP2015-114597A

However, if there are the following factors, the weight may be displaced in the hole, or in the worst case, the weight may fall out of the hole.
Factors include, for example, the fact that the elastic force of the weight is weakened due to material variations and temperature changes, that the weight becomes slippery in the hole due to grease or the like adhering to the hole, For example, there is an abnormality in the shape of the fold due to molding failure, and the key repeatedly collides with the piano body during performance.

  In view of the above points, an object of the present invention is to provide a key in which a weight is difficult to fall off.

  The key of the keyboard instrument according to claim 1 is formed of a key main body portion having a hole portion that opens toward the back side and a material that can be elastically deformed when the side that the player touches during performance is the front side. A weight portion that is pushed into the hole portion to prevent it, and a protruding drop-off prevention portion formed in the hole portion, wherein the weight portion is elastically deformed when the weight portion is pushed into the hole portion. And a drop-off restraining portion having a height that can prevent the weight portion that has been climbed over from being removed from the hole portion.

According to this, when the weight part is pushed into the hole part of the key body part, the weight part is not only pulled out by the key body part by stretching in the hole part, but also by the drop-off preventing part.
In addition, since the drop-off restraining part has a height that can be overcome if the weight part is elastically deformed, the weight part is smoothly pushed into the hole without being obstructed by the drop-off restraining part.

  Therefore, since the key of the keyboard instrument of the present invention is double-prevented, the weight portion can be prevented from falling off the key body portion, and nevertheless, the weight portion can be smoothly inserted into the hole portion. Can be pushed into.

  Next, the key of the keyboard instrument is a protrusion-like deviation prevention portion formed in the hole portion as described in claim 2, and is located on the back side as viewed from the opening of the hole portion than the drop-off prevention portion. There may be provided a displacement restraining portion that is provided and lower in height than the drop-off restraining portion.

  According to this, when the weight portion is pushed into the hole portion, a gap is formed between the upper end of the key drop prevention portion and the lower end of the weight due to a small thickness dimension of the weight. However, the deviation prevention part can bite in and prevent the upper and lower rattling.

Therefore, the key of the keyboard instrument can further suppress the weight portion from dropping off from the key body portion and can suppress the backlash of the weight.
Next, the weight part included in the key of the keyboard instrument is provided on the surface of the weight main body part and the weight main body part facing the drop-off preventing part when being pushed into the hole, as described in claim 3. It may be provided with a plurality of fold parts arranged along the direction in which the weight part is pushed into the hole.

According to this, when the weight part exceeds the drop-off preventing part, the weight main body part is elastically deformed, and the fold part is bent in the direction opposite to the pushing direction to reduce the entire weight part width.
Therefore, the key of the keyboard musical instrument of the present invention can be smoothly pushed into the hole without being disturbed by the drop-off preventing portion as compared with the case where only the weight main body is elastically deformed.

  In addition, when the key main body portion includes the displacement restraining portion in the hole portion, the displacement restraining portion is fitted between the fold portions that extend beyond the drop-off restraining portion, and the above-described upper and lower rattling can be restrained by this fitting. .

  Therefore, when the key of the keyboard musical instrument of the present invention is provided with the deviation prevention part, it is possible to further prevent the weight part from dropping off from the key body part and to suppress the play of the weight.

It is a perspective view of a weight part. FIG. 2 (A) is a front view of the key body portion showing the internal structure in a transparent view. FIG. 2B is a cross-sectional view taken along the line IIB-IIB in FIG. It is a back surface perspective view of a key main-body part. FIG. 4A is a front view of the key showing the internal structure of the key in a transparent view. FIG. 4B is a cross-sectional view taken along the line IIIB-IIIB in FIG.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings.
The key 1 of the electronic piano according to this embodiment includes a key body 3 and a weight 5.
The weight part 5 will be described with reference to FIG.

The weight portion 5 is made of rubber mixed with iron powder, and has a weight main body portion 50 and a plurality of fold portions 52.
The weight main body 50 is formed in a rectangular parallelepiped shape.

The plurality of pleat portions 52 are side surfaces (surfaces constituting the thickness of the weight main body portion 50) along the direction in which the weight 5 is pushed into a hole 30 (see FIG. 2) described later (direction of arrow A in FIG. 1). Among them, they are juxtaposed along the pushing direction A on a pair of side surfaces located on opposite sides.

  Each fold portion 52 is formed in a linear shape along a direction perpendicular to the pushing direction A. Further, the folds 52 are formed so that the overall cross-sectional shape (the cross-sectional shape perpendicular to the longitudinal direction of each fold 52 (the direction of the arrow B in FIG. 1)) is a saw blade. The cross-sectional shape is formed in a right triangle shape.

A double-sided tape 54 is attached to the upper surface of the weight main body 50.
The key body 3 will be described with reference to FIGS.
The key body 3 is formed with a plurality of holes delimited by ribs 39, including a hole 30 for attaching the weight 5 described above. These holes are opened toward the back side when the side that the player touches during performance is the front side. The center of gravity of the key body 3 is located at the center in the longitudinal direction, and the hole 30 is provided closer to the player than the center of gravity.

  A protrusion-like drop-off preventing portion that protrudes toward the inside of the hole 30 on each inner wall surface of the key body 3 that forms the hole 30 and is perpendicular to the direction in which the keys 1 are arranged. 32 and a pair of misalignment suppressing portions 34 are provided. The drop-off prevention part 32 and the deviation prevention part 34 are formed in a long shape along the longitudinal direction of the key body part 3. Further, the drop-off prevention part 32 and the pair of deviation prevention parts 34 are arranged side by side along the pushing direction (the direction of arrow A in FIG. 2, the direction of pushing the weight part 5 from the opening 31 of the hole 30).

  The drop-off prevention part 32 is a protrusion that is provided in the vicinity of the opening 31 of the hole 30 and has a height higher than that of the deviation prevention part 34. The drop-off restraining portion 32 can overcome the weight portion 5 by elastic deformation when the weight portion 5 is pushed into the hole portion 30, and can prevent the weight portion 5 that has climbed over from coming out of the hole portion 30. It is formed at a certain height. In other words, the drop prevention part 32 adjusts the height so that the distance between the tips of the drop prevention part 32 provided on each wall surface constituting the hole part 30 is narrower than the width of the weight main body part 50. Is formed. Further, the drop-off prevention part 32 takes into account the deformation when the wall surface provided with the drop-off prevention part 32 is pushed in, the fold part 52 and the like, and the tip of the drop-off prevention part 32 provided on each wall surface constituting the hole 30. The height is adjusted so that the distance between them is such that the weight main body 50 can pass if it is elastically deformed.

The deviation restraining portion 34 is provided on the back side of the hole portion 30 with respect to the drop-off restraining portion 32 when viewed from the opening 31, and is formed to have a height lower than that of the drop-off restraining portion 32.
The attachment of the weight portion 5 to the key body portion 3 described above will be described.

  When attaching the weight part 5 to the key body part 3, first, according to the stage of the sound to which the static load of the key 1 is applied, the static load is 45 g to 80 g at a position 23 mm from the tip of the key body part 3. The weight part 5 is cut into an appropriate size.

  Then, the weight 5 is pushed into the hole 30 of the key body 3. At this time, the weight portion 5 hits the drop-off prevention portion 32, but the weight main body portion 50 is elastically deformed and the fold portion 52 is bent in the direction opposite to the pushing direction A, and gets over the drop-off prevention portion 32.

  Thereafter, as shown in FIG. 4, when the weight part 5 is accommodated in the hole part 30, the drop-off prevention part 32 is formed at a height that can prevent the weight part 5 from coming out of the hole part 30. The drop-off prevention unit 32 prevents the drop-off.

  Further, when the weight portion 5 is housed in the hole portion 30, the fold portion 52 that is sunk when the weight portion 5 exceeds the drop-off prevention portion 32 spreads and stretches in the hole portion 30, so that the weight portion 5 is prevented from coming off. Further, the weight portion 5 is prevented from coming off because the stretched fold portion 52 is caught by the drop-off preventing portion 32.

Moreover, since the weight part 5 is accommodated in the hole part 30 and the crease part 52 spreads in the hole part 30, since the shift | offset | difference suppression part 34 fits between the crease parts 52, the rattling of an up-down direction is suppressed. .
Further, when the weight portion 5 is accommodated in the hole portion 30, the double-sided tape 54 is stuck in the hole portion 30 and thus is prevented from coming off.

  As described above, the key 1 of the keyboard instrument of the present embodiment is prevented from coming off several times in addition to the tension of the fold portion 52, so that the weight portion 5 can be prevented from falling off. The backlash in the vertical direction is suppressed. Nevertheless, the weight portion 5 can be smoothly pushed into the hole portion 30.

Among the terms described in the claims, the deviation restraining portion is a functional portion that restrains the weight portion from shifting in the hole portion. Further, the fold portion is a pleated functional portion provided in the weight main body portion.
Other embodiments will be described.

(1) The weight part 5 demonstrated by the said embodiment is an example to the last, and is not limited to this.
(2) In the above embodiment, rubber is exemplified as the material constituting the weight portion 5, but the material is not limited to this. For example, a soft resin such as a thermoplastic elastomer may be used, or an elastic material may be used. Any type may be used. Moreover, although metal powder was mixed in rubber | gum in the said embodiment, it is not restricted to metal powder, It is not necessary to mix at all.

  (3) In the above-described embodiment, the fold portion 52 is formed on the pair of side surfaces sandwiching the weight main body portion 50 among the side surfaces positioned around the pair of surfaces perpendicular to the pressing direction A of the weight main body portion 50 into the hole 30. However, the folds 52 may also be provided on the other pair of side surfaces. Moreover, you may provide in each two pairs.

  (4) In the above embodiment, the weight main body 50 has a rectangular parallelepiped shape, but is not limited thereto. For example, in the case of a columnar shape, the fold portion 52 may be provided on a part or all of the side surface around the axis about the pushing direction A in which the weight main body portion 50 is pushed into the hole portion 30. Two or three places may be provided at equal intervals around the pushing direction a.

  (5) In the above-described embodiment, the weight portion 5 is configured such that when the weight portion 5 is attached to the key body portion 3, the weight of the key body portion 3 is 45 g to 80 g, but the static load is 50 g to 70 g. Furthermore, it is good also as 53-57g.

(6) In the above embodiment, an electronic piano is taken as an example of a keyboard instrument, but the present invention is not limited to this. For example, an electronic organ or a synthesizer may be used.
(7) The weight portion 5 described in the above embodiment may be manufactured by extrusion molding and cut to an appropriate size at the time of extrusion molding, or may be cut to an appropriate size immediately before being attached to each key body portion 3. May be. Moreover, you may shape | mold to the magnitude | size which does not need to cut | disconnect from the beginning.

  (8) In the above embodiment, the weight portion 5 includes the double-sided tape 54, but the double-sided tape 54 may not be provided.

DESCRIPTION OF SYMBOLS 1 ... Key 3 ... Key main-body part 5 ... Weight part 30 ... Hole part 31 ... Opening 32 ... Drop-off prevention part 34 ... Misalignment prevention part 39 ... Rib 50 ... Weight main-body part 52 ... Creep part 54 ... Double-sided tape

Claims (3)

When the player touches the side to be played during the performance, the key body having a hole that opens toward the back side,
A weight portion that is formed of an elastically deformable material and is pushed into the hole portion to prevent it from being removed;
A protruding drop-off prevention portion formed in the hole, the weight being elastically deformed when the weight is pushed into the hole, and the weight being overcome A key for a keyboard instrument, comprising: a drop-off preventing portion having a height capable of preventing the hole from being removed from the hole portion. The key of the keyboard instrument according to claim 1,
A protrusion-like deviation prevention portion formed in the hole, the deviation prevention provided at the back side as viewed from the opening of the hole than the drop-off prevention portion and having a height lower than that of the drop-off prevention portion. A keyboard instrument key characterized by comprising a section. The key of the keyboard instrument according to claim 1 or 2,
The weight portion is
A weight body,
A plurality of fold portions provided on the surface of the weight main body portion facing the drop-off suppressing portion when being pushed into the hole portion, and arranged along the direction in which the weight portion is pushed into the hole portion. Key of the keyboard instrument that features it.

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