JP2016194719A - Keyboard instrument key - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a good-looking key for keyboard instrument in which a weight can be easily attached to a key body without causing any crack on a wood of the key body when attaching a weight thereto while ensuring a desired touch weight when pressing the key.SOLUTION: The keyboard instrument key includes: a rotatable key body 2 comprising a wood 11 extending in a cross direction, and a synthetic resin cover part 12 for covering at least an upper face and a front face of the wood 11; and a weight 22 which is embedded in the wood 11 and a part exposed from the surface of the wood 11 is covered by the cover part 12.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a key of a keyboard instrument such as a piano, and more particularly to a key of a keyboard instrument provided with a weight to obtain a desired touch weight when a key is pressed.

  Conventionally, what was described in patent document 1, for example as a key of this kind of keyboard musical instrument is known. The key of this keyboard instrument includes a wooden key body extending in the front-rear direction and a metal weight attached to the key body and made of iron, copper, or the like. The key body is formed with an attachment hole that penetrates in the left-right direction and attaches a weight. The mounting hole is formed in a circular shape with a constant cross section over the entire lateral direction of the key body. Further, the weight is formed in a columnar shape having substantially the same size as the attachment hole of the key body, and protrusions extending over the entire radial direction are formed on both end faces.

  When attaching the weight to the key body, the weights are inserted into the mounting holes of the key body, and both end surfaces of the weight are pressed with a hammer or the like to crush both protrusions. Thereby, each protrusion is compressed and deformed, and both end portions in the length direction protrude in the radial direction of the weight. As a result, the protruded portion bites into the inner peripheral surface of the key body mounting hole, whereby the weight is fixed to the key body mounting hole.

JP 2005-266035 A

  As described above, in the above-described key, when attaching the weight, the ends of the protrusions on both end surfaces are bitten into the key body, so depending on the biting position, There is a risk of cracking around the mounting hole. When such a crack occurs in the key body, the appearance of the key deteriorates, and the merchantability of the keyboard instrument also deteriorates. In addition, when the weights are not sufficiently crushed against the protrusions, the weight may fall off the key body, or the weight may protrude from the mounting hole and come into contact with the adjacent key.

  The present invention has been made in order to solve the above-described problems, and causes a crack in the wood portion of the key body when attaching the weight while securing a desired touch weight when pressing the key. An object of the present invention is to provide a key of a keyboard instrument that can easily attach a weight to a key body and can obtain a good-looking key.

  In order to achieve the above-mentioned object, the invention according to claim 1 is a pivotable structure having a wood part extending in the front-rear direction and a synthetic resin cover part provided to cover at least the upper surface and the front surface of the wood part. And a weight embedded in the wood part and exposed from the surface of the wood part by the cover part.

  According to this configuration, the weight is embedded in the wooden portion of the rotatable key body, and the portion exposed from the surface of the wooden portion is covered with the synthetic resin cover portion. As a result, the weight embedded in the wooden portion is not visible from the outside, and thus a key with good appearance can be obtained while ensuring a desired touch weight when pressing the key.

  According to a second aspect of the present invention, in the key of the keyboard instrument according to the first aspect, the wooden part is formed with a recess that opens outward, and the weight is embedded in the wooden part in a state of being fitted into the concave part. It is characterized by being.

  According to this configuration, the weight attached to the key body is embedded in a state where the weight is fitted into the recess formed in the wood part, so that the weight can be easily and firmly attached to the wood part. Moreover, since the weight is covered with the wood part and the cover part, it does not fall off from the key body or protrude from the recess.

It is a figure which shows the key of the keyboard musical instrument by 1st Embodiment of this invention, (a) is a perspective view which shows the external appearance of a key, (b) is a perspective view which expands and shows the state before attachment of a weight, (c) ) Is an enlarged cross-sectional view showing a state in which a weight is attached. It is a figure which shows the key of the keyboard musical instrument by 2nd Embodiment of this invention, (a) is a perspective view which shows the external appearance of a key, (b) is a perspective view which expands and shows the state before attachment of a weight. It is a figure for demonstrating the modification of the key by 2nd Embodiment, (a) is the state which the recessed part for weight opened | released ahead of the wood part, (b) is the recessed part for weight above and ahead of the wood part. Indicates the opened state.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a key of a keyboard instrument according to a first embodiment of the present invention. The key 1 is a white key that is applied to a keyboard such as an electronic piano, and constitutes a keyboard by being arranged in parallel with a black key (not shown) in the horizontal direction (for example, 88 keys). As shown in FIG. 1, the key 1 includes a key body 2 extending in the front-rear direction, two left and right weights 3 and 3 attached to the key body 2, and these weights 3 and 3 fixed to the key body 2. Rivets 4 are provided.

  The key body 2 is made of a predetermined type of wood material, and has a wood portion 11 having a rectangular cross section extending in a front-rear direction and a synthetic resin key cover 12 attached to the front portion of the wood portion 11. doing. The wood portion 11 is formed with a balance pin hole 13 penetrating in a vertical direction at a predetermined position behind the center in the front-rear direction, and a balance pin (not shown) standing through the balance pin hole 13. ), The key 1 is rotatably supported.

  Moreover, as shown in FIGS. 1B and 1C, the left and right side surfaces of the wood portion 11 are formed with recesses 14 and 14 that open outward at predetermined positions on the front portion thereof. These concave portions 14 and 14 are the same as each other, and have a predetermined shape (round shape in the present embodiment) and depth. In addition, the wood portion 11 is formed with a communication hole 15 having a predetermined diameter through which both the concave portions 14 and 14 are communicated.

  The key cover 12 is composed of an upper cover portion 12a extending a predetermined length in the front-rear direction, and a front cover portion 12b that is bent at a right angle from the front end portion of the upper cover portion 12a and extends downward, and the side shape is L-shaped. Is formed. The key cover 12 is adhered to the upper cover portion 12a so that the upper surface front portion of the wooden portion 11 is covered and the front cover portion 12b covers the entire front surface of the wooden portion 11.

  The weight 3 is made of a predetermined type of metal plate (for example, an iron plate) and has a predetermined shape and a predetermined thickness. Specifically, the weight 3 is formed in a round shape like the shape of the concave portion 14 of the wood portion 11 and is formed thinner than the depth of the concave portion 14. As a result, the entire weight 3 is accommodated in the recess 14 of the wood part 11. Further, the weight 3 has a through hole 3a that penetrates, and the mounting hole 3a has a diameter similar to that of the communication hole 15 of the wood part 11, and in the state in which the weight 3 is accommodated in the recess 14, the wood part 11 is formed at a position matching the communication hole 15.

  The rivet 4 has a shaft portion 4a having a diameter that can be inserted into the communication hole 15 of the wood portion 11 and the attachment hole 3a of each weight 3, and a head portion provided at one end portion of the shaft portion 4a. 4b. The two weights 3, 3 accommodated in the left and right recesses 14, 14 of the wood part 11 are fixed by the rivet 4. That is, in the state where the shaft portion 4a of the rivet 4 is passed through the mounting hole 3a of the weights 3 and 3 and the communication hole 15 of the wood portion 11, the end portion of the shaft portion 4a opposite to the head portion 4b (FIG. 1 (c) ) Is deformed under pressure. In this way, the weights 3 and 3 are firmly fixed to the wood part 11 by caulking with the rivets 4.

  As described above, according to the key 1 of the present embodiment, the two plate-like weights 3 and 3 are fixed to the left and right sides of the wood portion 11 of the key body 2 by caulking with the rivets 4, so that the weight can be attached. However, unlike the conventional case in which a part of the key body 2 is bitten, the wood part 11 of the key body 2 is not cracked. Therefore, the two weights 3 and 3 can be easily attached to the key body 2 while ensuring a desired touch weight at the time of key depression, and the key 1 having good appearance without cracks can be obtained.

  FIG. 2 shows keys of a keyboard instrument according to the second embodiment of the present invention. In the following description, the same components as those in the first embodiment described above are denoted by the same reference numerals.

  As shown in FIG. 2A, in this key 21, a weight 22 is embedded in the front end portion of the wood part 11. Specifically, as shown in FIG. 2B, a recess 23 having a predetermined size that is open upward and has a circular cross section is formed at the front end of the wood portion 11. On the other hand, the weight 22 is made of a predetermined type of metal (for example, an iron round bar) having the same size as the concave portion 23 of the wooden portion 11 and is fitted into the concave portion 23 of the wooden portion 11. Note that the upper surface of the weight 22 fitted in the recess 23 is flush with the upper surface of the wood portion 11.

  Further, a key cover 12 (cover portion) is bonded to the front portion of the wood portion 11 in the same manner as the key 1 of the first embodiment. That is, the key cover 12 is adhered to the upper cover portion 12a so that the upper surface front portion of the wooden portion 11 and the entire upper surface of the weight 22 are covered, and the front cover portion 12b covers the front surface of the wooden portion 11.

  In addition, the embedding of the weight with respect to the wooden part 11 may be made to insert the weights 32 and 42 in the recessed parts 33 and 43 as shown, for example in FIG. 3 (a) and (b), respectively. That is, in the same figure (a), the recessed part 33 formed in the front-end part of the wooden part 11 is open | released ahead, and the cross section is formed circularly. The front surface of the weight 32 fitted into the concave portion 33 is flush with the front surface of the wood portion 11 and is covered by the front cover portion 12 b of the key cover 12. On the other hand, in the same figure (b), the recessed part 43 formed in the front-end part of the wooden part 11 is open | released upwards and the front, and the side shape is formed in fan shape. The upper surface and the front surface of the weight 42 fitted in the recess 43 are flush with those of the wood portion 11, and are covered by the upper cover portion 12a and the front cover portion 12b of the key cover 12.

  As described above, according to the key 21 of the present embodiment, the weight 22 (hereinafter, including the weights 32 and 42) inserted into the recess 23 (hereinafter, including the recesses 33 and 43) of the wood part 11 is the upper surface thereof. Although the front surface is exposed from the surface of the wood portion 11, the exposed portions are covered with the upper cover portion 12a and / or the front cover portion 12b of the key cover 12, respectively. Thereby, the weight 22 embedded in the wooden part 11 is not visible from the outside. Therefore, it is possible to obtain the key 21 having a good appearance while ensuring a desired touch weight when the key is pressed.

  The key 21 can be manufactured as follows, for example. First, the length and thickness of the wood part 11 in the front-rear direction and the height in the up-down direction are the same as the length and thickness in the front-rear direction, respectively, and a plate-like shape having a predetermined length dimension for the plurality of wood parts 11 in the left-right direction. Prepare wood. Next, a plurality of recesses 23 are formed at predetermined intervals along the left-right direction in the front end portion of the wooden material, and weights 22 are respectively inserted into these recesses 23. Next, the plurality of key covers 12 are bonded to the front end portion of the wooden material in a state of being arranged in parallel in the left-right direction while covering the plurality of weights 22. The plurality of key covers 12 may be a single molded product that is continuous in the left-right direction. Thereafter, the wood material is cut between the key covers 12 and 12 adjacent to each other along the front-rear direction. Thereby, the plurality of wood portions 11 are cut out from the wood material, and the plurality of keys 21 including the weight 22 and the key cover 12 can be efficiently manufactured.

  In addition, this invention can be implemented in various aspects, without being limited to the said embodiment described. In the embodiment, the present invention is applied to a key of a so-called wooden keyboard in which most of the keys 1 and 21 are configured by the wood part 11, but the present invention is not limited to this, and most of the keys are made of synthetic resin. Even a so-called plastic keyboard composed of the above can be applied to a keyboard having a wooden part inside the key.

  Further, in the first embodiment, the rivet 4 is adopted as the fixing means of the present invention, and the two left and right weights 3 and 3 are attached to the wood part 11 of the key body 2 by caulking of the rivet 4, but as the fixing means, For example, bolts and nuts can be used.

  In addition, the detailed configurations of the key body 2 and the weights 3 and 22 shown in the embodiments are merely examples, and can be appropriately changed within the scope of the gist of the present invention. For example, the shapes of the weights 3 and 22 may be rectangular or polygonal in addition to the round shape or the sector shape, and the number of weights 3 and 22 may be a touch weight required for the key 1 to be attached. It is possible to increase / decrease appropriately according to. In addition, for the materials of the weights 3 and 22, it is also possible to employ metals other than iron or various materials having a relatively large specific gravity (such as composite materials of metal and synthetic resin).

DESCRIPTION OF SYMBOLS 1 Key 2 Key body 3 Weight 3a Mounting hole 4 Rivet 11 Wood part 12 Key cover (cover part)
14 Recess 15 Communication hole 21 Key 22 Weight 23 Recess 32 Weight 33 Recess 42 Weight 43 Recess

Claims (2)

A rotatable key body having a wood part extending in the front-rear direction, and a synthetic resin cover part provided so as to cover at least the upper surface and the front surface of the wood part;
A weight embedded in the wood part and exposed from the surface of the wood part covered by the cover part;
A keyboard instrument key characterized by comprising: The wood part has a recess that opens outward,
The key of the keyboard instrument according to claim 1, wherein the weight is embedded in the wooden portion in a state of being inserted into the concave portion.

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