JP2959495B2 - Key structure of keyboard instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key structure of a keyboard instrument in which a rib is vertically provided below a key operation surface and a weight is provided on a lower surface of the key operation surface.

[0002]

2. Description of the Related Art Conventionally, as a key structure of a keyboard musical instrument of this kind, there is, for example, one shown in FIGS. 7 (a) and 7 (b). Briefly describing this, the key shown in FIG. 7A is obtained by integrally molding a key 41 with a resin or the like into a U-shaped cross section.
Rib 41c hanging down in the key pressing direction on the lower surface of key operation surface 41i
An L-shaped key stopper piece 41f reinforced with a rib is integrally provided, and a weight 42 is attached to the lower surface of the key operation surface 41i in front of the rib 41c.

The key 41 has a key fulcrum 41 formed at the rear.
a is swingably supported by the edge 43a of the keyboard frame 43, and is urged clockwise in the figure by a key return spring 44 engaged with the keyboard frame 43, so that the key stopper piece 41f is attached to the keyboard frame 43. The swing range of the key 41 is regulated by bringing the upper and lower stoppers 45a and 45b into contact with each other.

FIG. 7B shows a key 51 shown in FIG.
In addition to the rib 51c, a rib 51c 'is further provided vertically below the lower surface of the key operation surface 51i, the key stopper piece 51f is reinforced by the ribs 51c, 51c', and a weight 52 is adhered to the rib 51c 'and held. I am trying to do it. The other structure is the same as that of the conventional example shown in FIG.

[0005]

However, in such a conventional key structure of a keyboard instrument, the key pressing speed is so fast that the inertial force acting on the weight in the key pressing direction is smaller than the adhesive force with the key. As the size increases, there is a problem that the weight is easily peeled off from the key. In particular, when an environmental change such as a temperature difference or a humidity difference becomes large, there is a disadvantage that the adhesive force between the key and the weight is reduced, and the possibility of peeling and falling is increased.

[0006] Further, since a plurality of ribs for reinforcing the key stopper pieces are provided vertically on the lower surface of the key operation surface, if the ribs are made thicker to increase the reinforcing force, the key operation corresponding to the base of the rib is performed. There is also a problem in that sinks tend to occur on the surface due to the difference in heat shrinkage during molding, and the appearance of the key is significantly impaired.

[0007] The present invention has been made in view of the above points, and is intended to prevent a weight from falling from a key.
An object of the present invention is to prevent sink marks generated on a key operation surface.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a key operating surface provided at a predetermined distance from a key fulcrum, a rib hanging downward in a key pressing direction, and a lower surface of the key operating surface. In a key structure of a keyboard instrument in which a weight is disposed, a gap is provided between a lower surface of the key operation surface and an upper end of the rib, and the key structure of the keyboard instrument in which the weight is fitted in the gap. To provide. Further, in the above key structure, if the weight-fitting gap has a shape in which the weight can be elastically mounted, the weight can be more reliably held.

The key structure of the keyboard instrument according to the present invention is constructed as described above, whereby the weight is sandwiched between the lower surface of the key operation surface and the upper end of the rib, and the weight acts downward when the key is pressed. The inertia force is supported by the rib to prevent the weight from falling. In addition, since a gap is provided between the lower surface of the key operation surface and the upper end of the rib, there is no risk of sink marks on the key operation surface, and the appearance of the key can be improved.

[0010]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a sectional side view showing a first embodiment of the present invention together with a keyboard frame, FIG. 2 is a sectional view showing a part of the key only in an enlarged manner, (a) is a sectional side view, and (b) is a sectional view. FIG. 3A is a cross-sectional view taken along line X1-X1 of FIG. 3, FIG. 3 is an enlarged cross-sectional view showing a part of a key fitted with a weight, FIG. 3A is a side cross-sectional view thereof, and FIG. (A) is a cross-sectional view along the line X2-X2 in FIG.

First, an outline of a key having a key structure according to the present invention will be described with reference to FIG. Key 1 is, for example, A
Molded with a slightly elastic impact-resistant resin such as S resin or ABS resin, and integrally forming a thin portion 1a at the rear end,
By screwing the thin portion 1a to the keyboard frame 3, the key 1 is supported swingably up and down about the thin portion 1a as a fulcrum.

A lower end stopper 1d reinforced by ribs 1b and 1c is provided at the front end of the key 1, and a rib 1e is provided at the rear thereof.
L-shaped upper limit stopper 1f reinforced by the above, and actuators 1h, 1h 'reinforced with reinforcing ribs 1g, 1g' are respectively formed at the rear thereof so as to protrude downward and be integrally formed. The inner surface of the stopper 1d forms a guided portion corresponding to the key guide 3b provided on the keyboard frame 3 side.

The lower limit stopper 1d and the upper limit stopper 1f are brought into contact with a felt lower limit locking member 5b and a rubber upper limit locking member 5a provided on the keyboard frame 3, respectively. The key switch is controlled by restricting the swing range and causing the actuators 1h, 1h 'to buckle the contact rubber members 6, 6' having a bowl-shaped bulging portion disposed on the keyboard frame 3 side by pressing a key. It is opened and closed to generate musical sounds.

[0014] Of the plurality of ribs suspended below the key 1,
The ribs 1c below the key operation surface 1i are shown in FIGS.
As shown in FIG. 2, a gap C is formed between the upper end of the key 1 and the lower surface of the key operation surface 1i of the key 1. A weight 2 having an adhesive applied to the upper surface is inserted into the gap C and fitted. By doing
The weight 2 is firmly fixed to the lower surface of the key operation surface 1i, as shown in FIGS. 3 (a) and 3 (b).

In the key 1 having such a structure, the lower surface of the weight 2 is held at the upper end of the rib 1c, and the upper surface is attached to the entire lower surface of the key operation surface 1i. Even if the inertia force acts on the weight 2 downward by pressing the key, the weight 2 does not separate from the key 1 and fall. If the weight 2 can be press-fitted between the lower surface of the key operation surface 1i and the upper end of the rib 1c, the adhesive for the weight 2 can be omitted.

Further, by forming a gap C between the rib 1c and the lower surface of the key operation surface 1i, the rib 1c does not branch off from the lower surface of the key operation surface 1i. The sink which has conventionally occurred on the key operation surface at the base of the rib can be completely eliminated.

FIGS. 4A and 4B are cross-sectional views showing a second embodiment of the present invention. FIG. 4A is a side cross-sectional view of a main part thereof, and FIG. 4B is a cross-sectional view taken along line X3-X3 in FIG. FIG. In this embodiment, the rib 1 for reinforcing the stopper piece 11f of the key 11
1e and a key operation surface 11 formed at the upper end of the key operation surface 11e '.
i, both side walls 11j, 1 in the gap C formed between
A pair of substantially semicircular elastic pieces 11k, 11k are integrally formed on the inner wall surface of the inner wall 1j with the convex surfaces facing each other.
The weight 12 having a width slightly larger than the interval between 1k and 11k is pressed into the space C from the lower surface of the key, so that the weight 12 is firmly loaded. Therefore, according to this embodiment, the weight 12 does not rattle in the gap C when the key is pressed, and the effect of preventing the weight from falling off is further improved.

FIG. 5 is a side sectional view showing a third embodiment of the present invention. In this embodiment, a pair of ribs 21c, 21c is vertically provided below the key operation surface 21i of the key 21, and upper ends thereof are connected by a connection surface 21c 'parallel to the key operation surface 21i. Upper surface and key operation surface 21
The weight 22 is fitted in a gap C formed between the lower surface i and the lower surface.

According to this embodiment, the force for holding the weight 22 becomes stronger and the weight 22 can be clamped from above and below over a wide area, so that the stability of holding the weight is greatly improved. And a larger weight can be attached without adhesive.

FIG. 6A is a sectional view showing a fourth embodiment of the present invention. In this embodiment, a pair of ribs 31c, 31c and a coupling surface 31c 'thereof are integrally formed with an elastic body 32a in a gap C between a lower surface of a key operation surface 31i of the key 31 and an upper surface of the coupling surface 31c'. Weight 3 covered
2 is fitted.

According to this embodiment, since the weight 32 is covered with the elastic body 32a, the elastic body 3a is pressed when the key is pressed.
After the weight 2a is elastically deformed to some extent, the weight 32 starts, and the impact on the finger at the time of key pressing due to the reaction force of the weight 32 can be reduced. At the same time, by utilizing the time delay until the start of the weight, it becomes possible to obtain bending and inertia at the time of key depression as in a piano keyboard instrument.

FIG. 6B is a cross-sectional view showing a modification of the fourth embodiment, in which the weight 32 'is formed in an L-shaped cross section to increase its size. That is, a space C is formed between the lower surface of the key 31 'and a rib body composed of a pair of ribs 311c, 311c and a connecting surface 311c' connecting the upper part thereof, and the space C is covered with an elastic body 32a '. An L-shaped weight 32 ′ is fitted into the elastic body 32.
a ′, and a projection 34 is provided on the rib 311.
c is fitted into the concave portion 33 formed in c. In this way, weights having different masses can be inserted into the fixed gap C in any of the embodiments of FIGS. 6A and 6B, and even if the key is formed by the same mold. It is possible to provide keys having different masses.

In the embodiment shown in FIG. 1, a case has been described where the present invention is applied to a keyboard electronic musical instrument.
The present invention is not limited to this, and can be applied to general keyboard instruments such as pianos and organs without any problem.

[0024]

As described above, in the key structure of the keyboard instrument according to the present invention, the weight is fitted in the gap provided between the lower surface of the key operation surface and the upper end of the rib hanging in the key pressing direction. Since the inertia force in the falling direction of the weight caused by the key depression can be held by the rib, the weight can be prevented from falling. Further, by providing a gap between the lower surface of the key operation surface and the upper end of the rib, there is no risk of sink on the key operation surface during molding of the key, and the appearance of the key can be improved. .

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a first embodiment of the present invention together with a keyboard frame.

FIG. 2 is an enlarged sectional view showing a part of only the key.

FIG. 3 is an enlarged sectional view showing a part of a key on which a weight is mounted.

FIG. 4 is a sectional view showing a part of a second embodiment of the present invention in an enlarged manner.

FIG. 5 is a side sectional view showing a part of a third embodiment of the present invention in an enlarged manner.

FIG. 6 is an enlarged side sectional view showing a part of a fourth embodiment of the present invention.

FIG. 7 is a side sectional view illustrating a key structure of a conventional keyboard instrument.

[Explanation of symbols]

1, 11, 21, 31,... Key, 1c, 11e, 21c, 3
1c: rib, 1i, 11i, 21i, 31i: key operation surface, 11k: elastic piece, 2, 12, 22, 32 ... weight

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-169494 (JP, A) JP-A-4-172397 (JP, A) JP-A-1-103885 (JP, U) JP-A-1 43400 (JP, U) JP-A 58-96593 (JP, U) JP-B 2-1468 (JP, B2) JP-B 63-56554 (JP, B2) JP-B 3-22789 (JP, Y2) J.P. 4-42878 (JP, Y2) (58) Field surveyed (Int. Cl. ⁶ , DB name) G10H 1/32-1/34 G10B 3/12 G10C 3/12

Claims (1)

(57) [Claims] 1. A key structure of a keyboard musical instrument having a rib provided in a key-pressing direction below a key operation surface at a predetermined distance from a key fulcrum, and a weight disposed on a lower surface of the key operation surface. A key structure for a keyboard instrument, wherein a gap is provided between a lower surface of a key operation surface and an upper end of the rib, and the weight is fitted into the gap.