Keyboard weights and keys for keyboard instruments

Abstract

To provide a keyboard weight that can add a sufficient weight to a key, can be easily attached to the key, and can be securely prevented from falling off the key, and a keyboard instrument key to which the keyboard weight is stably fixed.SOLUTION: A keyboard weight 3 attached by being inserted externally into a weight housing portion 8 provided in a key 1 of a keyboard instrument comprises: a first weight 20 made of an elastic material; and a second weight 30 made of a material having a higher specific gravity than the first weight 20 and attached to the first weight 20. When the first weight 20 to which the second weight 30 is attached is attached by being pushed into the weight housing portion 8, the first weight 20 is configured to be engaged with an inner wall surface 5 in an elastically deformed state by reaction force from the inner wall surface of the weight housing portion 8.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a keyboard weight that is applied to a keyboard device of a keyboard instrument such as an electronic piano and is attached to a key to obtain a desired touch weight when the key is pressed, and to a key of a keyboard instrument to which the keyboard weight is attached. [Background technology]

[0002] Conventionally, as an example of this type of keyboard weight and a key for a keyboard instrument, the one described in Patent Document 1, which has already been filed by the present applicant, is known. This keyboard weight is made of rubber mixed with iron powder, and has a rectangular parallelepiped weight body and a pleat portion having a plurality of pleats formed on both the left and right side surfaces of the weight body and arranged in parallel in the vertical direction. Meanwhile, the key is a white key that extends in the front-rear direction, and has a weight housing portion (weight mounting space in Patent Document 1) that opens downward at its front end.

[0003] When the above-mentioned keyboard weight is attached to a key during manufacturing, the keyboard weight is pushed into the weight housing from below the key. As a result, the left and right folds of the keyboard weight are elastically deformed while being sandwiched between the weight body and the left and right side walls of the weight housing, and the keyboard weight is fixed to the front end of the key by the tension caused by the restoring force. In this way, the above-mentioned keyboard weight can be easily attached to the key by simply pushing it into the weight housing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-114597 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, because the weight of the above-mentioned keyboard weight is relatively light, the key to which it is attached may feel light when pressed, and may not provide a good touch. Also, because the above-mentioned keyboard weight attached to the key is fixed to the weight housing of the key only by the tension of the left and right folds, if the restoring force due to the elastic deformation of the folds decreases due to long-term use of the keyboard instrument, the keyboard weight may shift downward or fall off the key.

[0006] The present invention has been made to solve the above problems, and has as its object to provide a keyboard weight that can add sufficient weight to a key so as to obtain a good touch, can be easily attached to the key, and can reliably prevent the keyboard weight from falling off the key, and a key for a keyboard instrument to which this keyboard weight is stably fixed. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the invention of claim 1 is a keyboard weight that is attached by being inserted from the outside into a weight housing provided on the key of a keyboard instrument, comprising a first weight made of an elastic material and a second weight made of a material having a higher specific gravity than the first weight and attached to the first weight, characterized in that when the first weight with the second weight attached is attached by being pushed into the weight housing, the first weight is configured to be engaged with the inner wall surface in a state elastically deformed by a reaction force from the inner wall surface of the weight housing.

[0008] According to this configuration, the keyboard weight includes a first weight made of an elastic material and a second weight attached thereto, with the second weight being made of a material with a higher specific gravity than the first weight. This allows the weight of the keyboard weight to be heavier than when the keyboard weight is made only of the first weight. Therefore, by attaching such a heavy keyboard weight to the key, it is possible to add sufficient weight to the key, which provides a good, solid, responsive touch when the key is pressed.

[0009] Furthermore, when attaching the keyboard weight to a key, the first weight to which the second weight is attached is inserted into the weight housing of the key. In this case, the first weight is engaged with the inner wall surface of the weight housing in a state where it is elastically deformed by a reaction force from the inner wall surface of the weight housing. In this way, when attaching the keyboard weight to the key, the first weight to which the second weight is attached is pushed into the weight housing of the key, so that the keyboard weight can be easily attached to the key, and the first weight is engaged with the inner wall surface of the weight housing in a state where it is elastically deformed, so that the keyboard weight can be reliably prevented from falling off the key.

[0010] The invention of claim 2 is characterized in that, in the keyboard weight described in claim 1, the first weight has a first weight main body portion extending a predetermined length in the front-to-rear direction, and a second weight mounting portion extending downward from the front of the first weight main body portion, for detachably mounting the second weight.

[0011] According to this configuration, the first weight has the above-mentioned first weight body and second weight mounting part, and by mounting the second weight to the second weight mounting part, the center of gravity of the keyboard weight can be set to a position closer to the front than the center in the front-to-rear direction. Also, since the second weight is detachably attached to the first weight, the weight of the keyboard weight can be easily adjusted by preparing multiple types of second weights with different weights.

[0012] The invention of claim 3 is characterized in that, in the keyboard weight described in claim 2, the first weight main body portion has an upper storage portion for the second weight that is open forward and extends in the vertical direction and is for storing an upper portion of the second weight, and the second weight mounting portion has left and right side wall portions extending downward a predetermined length from both left and right ends of the front of the first weight main body portion, and a bottom wall portion and a front wall portion arranged on the bottom and front sides of the left and right side wall portions, respectively, which are arranged to connect the lower ends of the left and right side wall portions, and a lower storage portion for the second weight that is connected to the upper storage portion for the second weight and for storing the lower portion of the second weight is formed by the left and right side wall portions, the bottom wall portion and the front wall portion.

[0013] According to this configuration, the first weight having the first weight body and the second weight mounting portion is provided with an upper housing portion for housing the upper part of the second weight in the first weight body, and a lower housing portion for housing the lower part of the second weight in the second weight mounting portion. The upper housing portion for the second weight is formed to open forward and extend in the vertical direction. The lower housing portion for the second weight has left and right side wall portions extending downward from both left and right ends of the front part of the first weight body, and a bottom wall portion and a front wall portion provided to connect the lower ends of the left and right side wall portions, and is configured to be connected to the upper housing portion for the second weight. By housing the second weight in the upper housing portion for the second weight and the lower housing portion for the second weight configured as described above, the second weight can be firmly and stably attached to the first weight.

[0014] The invention of claim 4 is characterized in that, in the keyboard weight described in claim 3, the second weight has a columnar upper part of the second weight extending a predetermined length in the vertical direction and having a predetermined diameter, and a columnar lower part of the second weight connected to the lower end of the upper part of the second weight, extending a predetermined length in the vertical direction and having a larger diameter than the upper part of the second weight, and when the second weight is attached to the first weight, the upper part of the second weight and the lower part of the second weight are respectively accommodated in the upper accommodation part for the second weight and the lower accommodation part for the second weight.

[0015] According to this configuration, the second weight has a columnar second weight upper part extending a predetermined length in the vertical direction, and a columnar second weight lower part connected to the lower end of the columnar second weight upper part and having a larger diameter than the second weight upper part. When the second weight configured in this way is attached to the first weight, the second weight upper part and the second weight lower part are respectively accommodated in the second weight upper housing part and the second weight lower housing part of the first weight. This allows the second weight to be attached to the first weight firmly and stably.

[0016] The invention according to claim 5 is characterized in that, in the keyboard weight according to claim 4, the second weight is composed of a plurality of types of second weights whose upper parts have different vertical lengths.

[0017] According to this configuration, by preparing multiple types of second weights with different vertical lengths of the upper part of the second weight, second weights of different weights can be obtained, and by attaching the second weights to the first weight, the weight of the keyboard weight can be easily adjusted.

[0018] The invention of claim 6 is a key for a keyboard instrument to which a keyboard weight as described in any one of claims 1 to 5 is attached, characterized in that the key has a weight accommodating section that is open downwards and formed hollow, and the side wall of the weight accommodating section is provided with a locking protrusion that engages with the first weight of the keyboard weight and locks the keyboard weight when the keyboard weight is accommodated in the weight accommodating section.

[0019] According to this configuration, the weight housing section of the key is formed in a hollow shape that opens downward. A locking protrusion provided on a side wall of the weight housing section engages with the first weight of the keyboard weight housed in the weight housing section to lock the keyboard weight. This makes it easy to obtain a key that is securely attached with the keyboard weight housed in the weight housing section.

[0020] The invention according to claim 7 is characterized in that, in the key for a keyboard instrument according to claim 6, the weight accommodating portion of the key is configured so that the keyboard weight can be attached in a reversed front-to-back state.

[0021] According to this configuration, the keyboard weight can be attached to the weight housing of the key not only in the normal state but also in the reversed state. For example, in a keyboard weight consisting of a first weight and a second weight, if the second weight, which has a higher specific gravity, is attached to a position closer to the front than the first weight, the center of gravity of the keyboard weight will be located forward of the center in the front-to-back direction. Therefore, by attaching the keyboard weight to the weight housing of the key in the reversed state in addition to the normal state, the center of gravity of the key to which the keyboard weight is attached can be located further back than when the keyboard weight is attached in the normal state. [Brief description of the drawings]

[0022] [Figure 1] 1A and 1B show a keyboard weight and a key for a keyboard instrument according to one embodiment of the present invention, in which (a) is an external perspective view of the key, (b) is a side view of the key, (c) is a cross-sectional view along line cc in (b), and (d) is a cross-sectional view along line dd in (c). [Diagram 2] 1(b) and (c) are enlarged cross-sectional views taken along the same lines as in FIGS. 1(c) and 1(d), respectively, showing a keyboard weight. FIG. [Diagram 3] 1A and 1B are perspective views showing the keyboard weight with the second weight removed from the first weight, in which (a) shows the state when viewed diagonally from above the front, and (b) shows the state when viewed diagonally from below the rear. [Figure 4] FIG. 2 corresponds to FIG. 1(c) and is an explanatory diagram for explaining the size of the weight receiving portion of the key body and the keyboard weight. [Diagram 5] FIG. 11 is a diagram for explaining the procedure for attaching a keyboard weight to a key body, in which (a) shows the state before the keyboard weight is inserted into the weight receiving section, (b) shows the state when the convex part of the keyboard weight abuts against the top wall of the key body, and (c) shows the state when the keyboard weight is received in the weight receiving section. [Figure 6] 1(a) is a side view of a key in which the keyboard weight is attached to the key body in a reversed front-to-back state, and FIG. 1(b) is a cross-sectional view taken in the same manner as FIG. 1(d). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] A preferred embodiment of the present invention will be described in detail below with reference to the drawings. Fig. 1 shows a key to which a keyboard weight according to one embodiment of the present invention is attached. As shown in the figure, this key 1 is a white key used in a keyboard device of a keyboard instrument such as an electronic piano, and a large number of keys (e.g., 88 keys) are arranged in parallel in the left-right direction together with black keys (not shown) to form a keyboard device. This key 1 includes a key body 2 that extends in the front-rear direction (the left-right direction in Fig. 1(b)), a keyboard weight 3 attached to this key body 2, and the like.

[0024] The key body 2 is made of a predetermined type of synthetic resin (such as AS resin) and is formed as a molded product of a predetermined shape extending in the front-rear direction. Specifically, the key body 2 has a horizontal top wall 4, left and right side walls 5, 5 (see FIG. 1(c)) that hang down from both the left and right ends of the top wall 4, and a front wall 6 provided at the front ends of the top wall 4 and the left and right side walls 5, 5. Reference numeral 7 denotes wooden boards, which are attached to the outer surfaces of the left and right side walls 5, 5 by adhesive or the like.

[0025] 1(b) to (d), a weight housing 8 for housing and attaching a keyboard weight 3 is provided at the front end of the key body 2. This weight housing 8 is formed in a box shape that opens downward. Specifically, the weight housing 8 of a predetermined size is defined by the top wall 4, the left and right side walls 5, 5, a rib wall 9 provided at a predetermined position behind the front wall 6, and a rear wall 10 provided at a predetermined position behind the rib wall 9.

[0026] Furthermore, three locking protrusions 5a for locking the keyboard weight 3 are provided at intervals in the up-down direction on the inner surface of each of the left and right side walls 5, 5. Each locking protrusion 5a extends a predetermined length in the front-rear direction and is formed to protrude inward in a tapered shape. Of the three locking protrusions 5a formed on each side wall 5, the lowest locking protrusion 5a is larger than the other two locking protrusions 5a and protrudes further inward.

[0027] Fig. 2 shows the keyboard weight 3, where (a) is an external perspective view, and (b) and (c) are enlarged cross-sectional views cut in the same manner as Fig. 1(c) and (d), respectively. This keyboard weight 3 is composed of a first weight 20 made of an elastic material, and a second weight 30 made of a specified metal (e.g., iron) with a higher specific gravity than the first weight 20 and attached to the first weight 20. Fig. 3 shows the keyboard weight 3 with the second weight 30 removed from the first weight 20, where (a) shows the state when viewed from diagonally above the front, and (b) shows the state when viewed from diagonally below the rear.

[0028] The first weight 20 is made of an elastic material such as a specific type of rubber with a relatively high specific gravity or rubber mixed with metal powder such as iron. The first weight 20 has a first weight main body 21 that extends a specific length in the front-rear direction and is substantially rectangular, and a second weight attachment part 22 that is provided so as to extend downward from the front of the first weight main body 21 and for detachably attaching the second weight 30.

[0029] The first weight body 21 is open forward, extends vertically, and has a second weight upper housing portion 21a for housing an upper portion of the second weight 30. The first weight body 21 is provided with a convex portion 23 that protrudes upward on its upper surface, and is provided with latched portions 24 that protrude outward on both left and right side surfaces and are latched to the side walls 5, 5 of the weight housing portion 8.

[0030] The convex portion 23 is formed in an M-shape when viewed from the front, and is composed of two convex portions 23, 23 arranged at a distance from each other in the left-right direction. Each convex portion 23 has two upper folds 23a, 23a formed symmetrically on the left and right, and extends in the front-rear direction over the entire upper surface of the first weight body 21.

[0031] The locked portion 24 has a sawtooth shape as a whole when viewed from the front, and is composed of five horizontal pleats 24a arranged in parallel along the vertical direction. Each horizontal pleat 24a has an inclined surface and a horizontal surface on the top and bottom, and extends in the front-rear direction over the entire side surface of the first weight body 21.

[0032] 3(b), two recesses 25 that are open downward and spaced apart from each other in the left-right direction are formed in the lower end of the first weight main body 21. Each recess 25 extends in the front-rear direction over the entire lower surface of the rear half of the first weight main body 21. These recesses 25, 25 make the rear half of the lower end of the first weight main body 21 more likely to elastically deform inwardly in the left-right direction.

[0033] The second weight mounting portion 22 has a horizontal cross-sectional (planar) shape formed in a U-shape that opens forward, and has a U-shaped accommodating portion 26 extending downward a predetermined length from the front half of the first weight main body portion 21, and a weight support portion 27 extending downward a predetermined length from the front half of this U-shaped accommodating portion 26 for supporting the lower part of the second weight 30.

[0034] The U-shaped housing portion 26 has a predetermined thickness, and its inner surface is formed flush with the inner surface of the second weight upper housing portion 21a formed in the upper first weight main body portion 21. In the following description, the second weight upper housing portion 21a includes the U-shaped housing portion 26.

[0035] The weight support section 27 has left and right side wall sections 28, 28 extending downward a predetermined length from both left and right ends of the front part of the U-shaped housing section 26, and a bottom wall section 29a and a front wall section 29b provided to connect the lower ends of the left and right side wall sections 28, 28 and disposed on the bottom and front sides of the both side wall sections 28, 28, respectively. The left and right side wall sections 28, 28, the bottom wall section 29a and the front wall section 29b constitute a second weight lower housing section 27a that is connected to the second weight upper housing section 21a and that houses the lower part of the second weight 30.

[0036] It should be noted that the first weight 20 having the above-mentioned shape can be easily and inexpensively molded using a relatively simple die.

[0037] On the other hand, as shown in Figures 2 and 3, the second weight 30 has a cylindrical second weight upper part 31 extending a predetermined length in the vertical direction, and a cylindrical second weight lower part 32 connected to the lower end of the second weight upper part 31, extending a predetermined length in the vertical direction, and having a larger diameter than the second weight upper part 31.

[0038] The second weight 30 can be manufactured relatively easily by casting or the like, and a number of types are prepared with different weights due to the different lengths of the second weight upper part 31. In the present embodiment, both the second weight upper part 31 and the second weight lower part 32 of the second weight 30 are cylindrical, but they may be formed in a columnar shape, and various shapes can be used, such as making the second weight upper part 31 cylindrical and the second weight lower part 32 a prismatic column such as a square column or a hexagonal column, or making both the second weight upper part 31 and the second weight lower part 32 a prismatic column.

[0039] In the keyboard weight 3 having the first weight 20 and the second weight 30 configured as above, the second weight 30 is attached to the first weight 20 as follows. That is, as shown in Fig. 3(b), the second weight upper part 31 of the second weight 30 is inserted from behind the rear opening of the weight support part 27 in the second weight attachment part 22 of the first weight 20, that is, the opening formed by the left and right side walls 28, 28 and the bottom wall part 29a and opening rearward. In this case, the second weight upper part 31 and the second weight lower part 32 of the second weight 30 are respectively accommodated in the second weight upper accommodation part 21a and the second weight lower accommodation part 27a while the weight support part 27 is elastically deformed. As a result, the second weight 30 is supported by the inner surface of the second weight upper housing portion 21a from both the left and right sides of the second weight upper portion 31 to the rear surface, and is supported by the inner surface of the second weight lower housing portion 27a from both the left and right sides of the second weight lower portion 32 to the front and bottom surfaces. In addition, the upper surface of the second weight lower portion 32 abuts against the bottom surface of the U-shaped housing portion 26. As a result, the second weight 30 is attached to the first weight 20 firmly and stably.

[0040] 4 corresponds to the above-mentioned FIG. 1(c), and shows the weight accommodating section 8 of the key body 2 and the keyboard weight 3 (shown by a two-dot chain line) before being accommodated therein. As shown in the figure, in the keyboard weight 3, the first weight body section 21 (shown by a one-dot chain line) is formed smaller than the weight accommodating section 8, and the outer shape of the first weight 20 including the upper convex section 23 and the locked section 24 is formed slightly larger than the weight accommodating section 8.

[0041] 5 shows the procedure for attaching the keyboard weight 3 to the key body 2. Fig. 5(a) shows the state before the keyboard weight 3 is inserted into the weight housing 8. The keyboard weight 3 is inserted into the weight housing 8 from below the key body 2. During this insertion, the horizontal folds 24a in the left and right locked portions 24 of the keyboard weight 3 receive a reaction force from the side walls 5 of the weight housing 8, and are elastically deformed so as to bend downward.

[0042] FIG. 5(b) shows the state immediately after the upper end of the convex portion 23 at the upper end of the keyboard weight 3 housed in the weight housing 8 comes into contact with the top wall 4 of the key body 2. In this state, the tip of the lowest horizontal fold 24a in the left and right locked portions 24 of the keyboard weight 3 is located below the lowest locking protrusion 5a on the side wall 5 of the weight housing 8. When the keyboard weight 3 is further pushed into the weight housing 8 from this state, as shown in FIG. 5(c), the upper folds 23a, 23a of each convex portion 23 of the keyboard weight 3 spread apart from each other and elastically deform so as to bend in the left and right direction. In this case, the left and right lowest horizontal folds 24a, 24a of the keyboard weight 3 climb over the lowest locking protrusion 5a, 5a of the weight housing 8 and are located above it, so that they are locked in a state supported from below by the lowest locking protrusion 5a, 5a.

[0043] As described above in detail, according to the keyboard weight 3 of this embodiment, the keyboard weight 3 is composed of the first weight 20 made of an elastic material and the second weight 30 made of a metal with a higher specific gravity than the first weight 20, so the weight of the keyboard weight 3 can be made heavier than when the keyboard weight 3 is composed of only the first weight. Therefore, by attaching such a heavy keyboard weight 3 to the key body 2, it is possible to add sufficient weight to the key 1, thereby providing a good touch with a solid response when the key is pressed.

[0044] Furthermore, when attaching the keyboard weight 3 to the key body 2, the first weight 20 is engaged with the engaging protrusion 5a with the left and right engaged portions 24, 24 elastically deformed by reaction forces from the inner surfaces of the left and right side walls 5 of the weight receiving portion 8. In this way, when attaching the keyboard weight 3 to the key body 2, the keyboard weight 3 can be easily attached to the key body 2 by pushing the keyboard weight 3 into the weight receiving portion 8 of the key body 2, and it is possible to reliably prevent the keyboard weight 3 from falling off the key body 2.

[0045] Furthermore, according to the key 1 of this embodiment, it is possible to easily obtain a key 1 in which the above-mentioned keyboard weight 3 is securely attached while being housed in the weight housing portion 8.

[0046] The present invention is not limited to the above-described embodiment, but can be embodied in various forms. For example, in the above-described embodiment, the keyboard weight 3 is attached to the key body 2 with the second weight 30 disposed at the front of the keyboard weight 3, but it is also possible to attach the keyboard weight 3 to the key body 2 in a reversed state.

[0047] 6(a) and (b) are similar to the above-mentioned Figs. 1(b) and (d), respectively, and show a state in which a keyboard weight 3 that is inverted front to back (left to right in Fig. 6) is attached to the weight accommodating section 8 of the key body 2. In this case, the position of the center of gravity can be set closer to the rear than that of the key 1 described above.

[0048] In addition, in this embodiment, rubber is exemplified as the first weight 20 and metal is exemplified as the second weight 30, but the first and second weights of the present invention are not limited to these, and it is sufficient that the specific gravity of the second weight is higher than that of the first weight, and various materials can be used, such as a composite material of metal and synthetic resin.

[0049] Furthermore, in this embodiment, a single key weight 3 is attached to the key body 2, but one or more key weights may be attached to other parts of the key body 2. By making the key 2 heavier, the moment of inertia of the key 2 that rotates around a fulcrum located at the rear end or rear of the key 2 when pressed can be increased, resulting in a keyboard that provides a good, solid feel and touch.

[0050] Furthermore, the detailed configurations of the keyboard weight 3, the first weight 20, the second weight 30 and the key 1 shown in the embodiment are merely examples and can be modified as appropriate within the scope of the spirit of the present invention. [Explanation of symbols]

[0051] 1 key 2 Key body 3 Keyboard weights 4. Ceiling Wall 5 side wall 5a Locking protrusion 8 Weight storage section 20 1st spindle 21 1st weight body part 21a Upper storage section for second weight 22 Second weight attachment part 23 Convex part 24 Locked part 26 U-shaped storage section 27 Weight support part 27a Lower storage section for second weight 28 Side wall 29a Bottom wall 29b Front wall 30 Second weight 31 Upper part of the second weight 32 2nd weight lower part

Claims

1. A keyboard weight that is attached by being inserted from outside into a weight receiving portion provided on a key of a keyboard instrument, A first weight made of an elastic material; a second weight made of a material having a higher specific gravity than the first weight and attached to the first weight; Equipped with A keyboard weight characterized in that, when the first weight to which the second weight is attached is pushed into the weight accommodating portion to be attached, the first weight is configured to be engaged with the inner wall surface of the weight accommodating portion in a state in which it is elastically deformed by a reaction force from the inner wall surface.

2. The first weight is A first weight body portion extending a predetermined length in the front-rear direction; a second weight attachment portion that is provided so as to extend downward from a front portion of the first weight body portion and that is used to detachably attach the second weight; 2. The keyboard weight according to claim 1, further comprising:

3. the first weight body portion has a second weight upper accommodation portion that is open forward, extends in a vertical direction, and accommodates an upper portion of the second weight; The second weight mounting portion is Left and right side wall portions extending downward by a predetermined length from both left and right end portions of a front portion of the first weight body portion; a bottom wall portion and a front wall portion provided so as to connect lower ends of the left and right side wall portions and disposed on bottom and front sides of the left and right side wall portions, respectively; having The keyboard weight according to claim 2, characterized in that the left and right side wall portions, the bottom wall portion and the front wall portion form a second lower weight storage portion that is connected to the second upper weight storage portion and that stores a lower portion of the second weight.

4. The second weight is a columnar second weight upper portion extending a predetermined length in the vertical direction and having a predetermined diameter; a columnar second weight lower portion that is connected to a lower end of the second weight upper portion, extends a predetermined length in the vertical direction, and has a diameter larger than that of the second weight upper portion; It has The keyboard weight according to claim 3, characterized in that, when the second weight is attached to the first weight, the upper part of the second weight and the lower part of the second weight are accommodated in the upper accommodation portion for the second weight and the lower accommodation portion for the second weight, respectively.

5. 5. The keyboard weight according to claim 4, wherein the second weight is made up of a plurality of types of second weights, the upper portions of which have different lengths in the up-down direction.

6. A key for a keyboard instrument to which the keyboard weight according to any one of claims 1 to 5 is attached, The key has a weight receiving portion that is open downward and formed in a hollow shape, A key for a keyboard instrument, characterized in that a side wall of the weight accommodating portion is provided with a locking protrusion that engages with the first weight of the keyboard weight and locks the keyboard weight when the keyboard weight is accommodated in the weight accommodating portion.

7. 7. The key for a keyboard instrument according to claim 6, wherein the weight accommodating portion of the key is configured so that the keyboard weight can be attached in a state in which it is inverted front to back.

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