JP3472674B2 - Upright piano pedal mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upright piano pedal mechanism.

[0002]

2. Description of the Related Art Conventionally, a pedal mechanism for an upright piano as shown in FIG. 3 has been known. In this pedal mechanism, the loud pedal 50 is connected to one end of a balance 54 that is swingably disposed on the upper surface of the bottom plate 52, and the loud pedal 50 is depressed / depressed.
When the releasing operation is performed, the balance 54 swings, and the push-up rod 56 mounted on the other end of the balance 54 is configured to move up / down. In addition, the soft pedal 60 is also the loud pedal 5
Similarly to 0, when the soft pedal 60 is connected to one end of the balance 64 and the soft pedal 60 is stepped on / released, the balance 64 swings so that the lifting rod 66 mounted on the other end of the balance 64 moves up / down. Was configured into.

By the way, various attachment structures of the balance 54 in such a pedal mechanism are conventionally known. For example, in the pedal mechanism shown in FIG. 4 as a first conventional example, a bracket 71 is fixed to the upper surface of a bottom plate 52 with a screw 70, and a balance metal fitting 73 is fixed to a lower surface of a balance 54 with a screw 72. By connecting the balance metal fitting 73 and the balance fitting 73 via the support shaft 74, the balance 54 is swingably supported. Further, spring supports 75, 76 are provided with screws 77 on the upper surface of the bottom plate 52 and the lower surface of the balance 54. , 78
The balance spring 79, which is compressed when the loud pedal 50 is stepped on, is secured by the balance spring 79 interposed between the spring receivers 75 and 76.
The balance 54 is pushed up during the release operation of the
It was configured to return 0 to the initial position.

Here, in FIG. 4, screws 70, 72,
As for 77 and 78, since they are actually screwed into each part, they cannot be seen from the front direction as shown in FIG.
In order to show the existence of each screw, each screw is drawn by a solid line in FIG. (Hereinafter, also in FIGS. 5, 6 and 1 described later, the screw is drawn by a solid line.) However, in the case of such a pedal mechanism, the bracket 71 is used.
It is necessary to accurately fix the balance metal fittings 73 and the balance fittings 73 at appropriate positions and to connect them by the support shafts 74 while keeping their bearing holes aligned with each other. Therefore, it is difficult to assemble them. It was Further, there is a drawback that the number of parts is large and the cost is disadvantageous as compared with the second and third conventional examples described later.

On the other hand, in the pedal mechanism shown in FIG. 5 as a second conventional example, a U-shaped leaf spring 82 is fixed to the upper surface of the bottom plate 52 and the lower surface of the balance 54 by screws 80.
At the same time that the balance 54 is swingably supported by the leaf spring 82, the leaf spring 82 that elastically deforms when the loud pedal 50 is depressed is operated by the leaf spring 82 when the loud pedal 50 is released.
Was pushed up to return the loud pedal 50 to the initial position. Since such a pedal mechanism has a smaller number of parts than that of the first conventional example, it is advantageous in terms of cost.

However, in the case of such a pedal mechanism, the swing center of the balance 54 is largely different depending on the characteristics of the leaf spring 82, and it is difficult to specify the swing center. Designing for location was not easy. Further, the heads of the screws 80 are all leaf springs 8.
2 comes inside, so insert your hand into the narrow space and screw 8
There was also a drawback that the work of tightening 0 was troublesome.

On the other hand, in the pedal mechanism shown in FIG. 6 as a third conventional example, a support base 90 is fixed to the upper surface of the bottom plate 52,
A flat plate-shaped leaf spring 9 is attached to the upper surface of the support base 90 with screws 92.
4 is fixed in a cantilever shape, and the balance 54 is fixed to the upper surface of the plate spring 94 with a screw 96 so that the balance 54 is swingably supported by the support 90 and the plate spring 94. Further, the leaf spring 94, which is elastically deformed when the loud pedal 50 is depressed, is configured to push up the balance 54 and return the loud pedal 50 to the initial position when the loud pedal 50 is released. Even with such a mounting structure, the number of parts is smaller than that of the first conventional example, and the swing center of the balance 54 is easier to specify than the second conventional example. It was

However, in the case of such a pedal mechanism,
Since the leaf spring 94 must be fixed to the support base 90 and then the balance 54 must be attached to the leaf spring 94, the head of the screw 96 faces the bottom plate 52 side, and the hand is also inserted into the narrow space. However, there is a drawback in that the work of tightening the screw 96 is troublesome.

That is, each of the above-mentioned three types of pedal mechanisms has a drawback that assembly is troublesome because the structure for supporting the balance is complicated or the screw tightening work is not easy. Further, the problems with the mounting structure of the balance 54 in such a loud pedal mechanism are exactly the same in the mounting structure of the balance 64 in the soft pedal mechanism, and the muffler pedal mechanism is of a type using a balance. Had a similar problem.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a pedal mechanism for an upright piano that can be assembled more easily than before.

[0011]

Means for Solving the Problems and Effects of the Invention In order to achieve the above-mentioned object, the invention according to claim 1 comprises a balance which is swingably disposed on a bottom plate of a piano,
The pedal of an upright piano which is configured to oscillate the balance by a stepping / release operation of a pedal connected to one end of the balance, and to raise / lower a lifting rod mounted on the other end of the balance. In the mechanism, the balance is mounted on the upper surface side of the support base, while supporting the vicinity of the central portion of the balance from below, the guide portion is brought into contact with the side surface of the balance,
It is characterized in that it has a structure for restricting the movement of the balance in the width direction.

In this pedal mechanism, the balance is only mounted on the upper surface side of the support base and is not connected to the support base. However, since one end of the balance is connected to the pedal side, the mounting position of the balance does not shift in the longitudinal direction of the balance, and the guide part is abutted on the side surface of the balance, so that the balance is mounted. The position does not shift in the width direction of the balance. Therefore, if one end of the balance, to which the pedal side is connected, moves up and down in accordance with the pedal operation, the balance swings around the support base as a swing center.

According to such a pedal mechanism, it is sufficient to simply mount the balance on the support base, connect it to the pedal side, and mount the lifting rod. For example, as in the first conventional example. , The work of connecting the balance to the bracket via the support shaft is unnecessary, and, for example, as in the second and third conventional examples,
It is not necessary to fix the leaf spring fixed on the bottom plate side to the bottom surface of the balance with screws. Therefore, it can be assembled more easily than any of the pedal mechanisms shown as the conventional example.

By the way, in this pedal mechanism, if the guide portion is constituted by a member that restricts the movement of the balance in the width direction by contacting the side surface of the balance, its specific shape is not particularly limited. Although not provided, as described in claim 2, if a pair of protrusions serving as the guide portions are formed on the upper surface side of the support base and the balance is arranged so as to be sandwiched between the protrusions, Since the projecting object that sandwiches the balance on the upper surface side of the support table will come into contact with the side surface of the balance and function as a guide part, this is different from the structure in which a member different from the support table is arranged as a guide part. If so, the number of parts will be reduced and the assembly will be less troublesome. Also, since the vicinity of the upper surface of the support base is near the swing center of the balance, and the vertical displacement of the balance is smaller than that near the ends of the balance, the guide part that abuts the side surface of the balance at such a position. If so, the dimension of the guide portion in the height direction can be suppressed, and a more compact structure can be obtained.

Also, in the pedal mechanism of the upright piano of the present invention, if the pedal is released after the pedal is depressed, it is necessary to promptly return the pedal to the initial position. As described in 3, the plate spring is fixed to the support table in a cantilevered manner, and the balance is mounted on the upper surface side of the plate spring so that the balance can move when the pedal is stepped on. It is advisable to have a structure that rocks while elastically deforming.

According to this pedal structure, when the balance swings and the leaf spring bends, the leaf spring exerts a force on the balance to return the balance to the initial position, so that the pedal is released. When the operation is performed, the force of the leaf spring returns the pedal to the initial position. Even in such a structure, since the balance is mounted only on the upper surface side of the leaf spring, it does not take time to mount the balance. Especially, since the leaf spring may be fixed to the support base before mounting the balance, the leaf spring can be easily fixed in a cantilever shape with a screw or the like, and the pedal structure using the leaf spring can be used. Even if there is, the screw tightening work is remarkably easy as compared with the structures of the second and third conventional examples.

In addition to the structure described in claim 3, there are various structures in which a spring or the like is connected to a movable portion (for example, a balance) of the pedal mechanism and the spring or the like urges the movable portion to the initial position. I can think. More specifically, for example, the first
It is possible to employ a balance spring as shown as a conventional example in the pedal mechanism of the present invention, and even in this case, the balance is mounted on the upper surface side of the support base, and the vicinity of the central portion of the balance is located on the lower side. The pedal structure of the present invention is unique in the pedal structure in which the balance is supported and the guide portion is brought into contact with the side surface of the balance to restrict the movement of the balance in the width direction. The effect is the same. However, the one shown as the first conventional example requires the work of attaching the upper and lower spring receivers and the like in an appropriate positional relationship, and this attaching work also requires a certain amount of work. If so, only one leaf spring needs to be attached, so the attachment work is easy.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to an example. As shown in FIGS. 1A and 1B, the pedal mechanism as the embodiment has a bottom plate 1
0 is fixed to the upper surface of the support table 14 and a pair of guide portions 12 are provided on the upper surface side so as to project.
Leaf spring 18 fixed in a cantilever shape with screws 16 between 2
A balance 20 mounted on the upper surface of the leaf spring 18, a pedal 24 connected to one end of the balance 20 via a balance bolt 22, and a hoisting rod 26 mounted on the other end of the balance 20. ing.

Of these, as shown in FIG. 2 (a), the support base 14 is formed by cutting wood into the guide portion 12 on the upper surface side.
As shown in FIG. 2 (b), the support base 34 is formed by bending the metal plate to form the guide portion 32.
May be In addition, the leaf spring 18 has a cantilever shape (that is, one end is a fixed end completely fixed on the support base 14 and the other end protrudes laterally from the support base 14 to move vertically. (As a free end that can be displaced in any direction)
It is fixed, and regarding the arrangement position with respect to the support base 14, the leaf spring 94 (see FIG. 6) previously shown as the third conventional example.
However, the leaf spring 94 is different from the leaf spring 94 that is connected to the balance 54 with the screw 96, in that it is not connected to the balance 20.

In the pedal structure constructed as described above, when the pedal 24 is stepped on, one end of the balance 20 is pulled downward via the balance bolt 22, and the balance 20 moves around the support base 14 as a swing center. Rock. Here, although the balance 20 is only mounted on the support base 14, the balance bolt 22 is in a state of moving only in the vertical direction, and therefore the balance 20 hardly moves in the longitudinal direction. Further, although the balance 20 is in a state of being rotatable about the balance bolt 22 with respect to the balance bolt 22, since the guide portion 12 is in contact with the side surface of the balance 20, such movement is also restricted. Therefore, although the balance 20 is not connected to the support base 14 at all, the mounting position does not shift, and the balance 20 swings in response to the operation of the pedal 24.

Further, the leaf spring 18 is bent downward with the swing of the balance 20 as described above. for that reason,
When the pedal 24 is released, the balance 20 is pushed back by the force of the leaf spring 18 to restore the original shape, and the pedal 24 is quickly returned to the initial position.

According to the pedal mechanism as described above,
Simply mount the balance 20 on the support 14 and use the pedal 24
Since the connection with the side and the mounting of the hoisting rod 26 may be performed,
For example, unlike the first conventional example, the work of connecting the balance and the bracket via the support shaft is unnecessary, and the troublesome screw tightening work of the second and third conventional examples is also unnecessary. Therefore, it can be assembled more easily than conventional products.

Further, since the guide portion 12 is integrally formed on the upper surface of the support base 14, the number of parts is smaller and the assembling work can be easily performed as compared with the case where these are separate parts. Further, since the guide portion 12 abuts on the balance 20 near the center of swinging, the dimension of the guide portion 12 in the height direction is suppressed, and the guide portion 12 becomes compact.

Further, since the leaf spring 18 is fixed to the support base 14 in a cantilevered manner and the balance 20 is mounted on the upper surface thereof, the balance 20 is not required to be connected to the balance 20. Can be returned to the initial position by the force of the leaf spring 18, and the attaching work of the leaf spring 18 is not troublesome.

Although the embodiment of the present invention has been described above, various embodiments of the present invention are possible other than the above example. For example, in the above pedal mechanism, the support base 14
Although the guide portion 12 was integrally formed on the upper surface of the, the guide portion manufactured as a separate component is attached to the support base, or the component to be the guide portion is attached to a portion other than the support base (for example, on the bottom plate). Therefore, the movement of the balance in the lateral direction may be restricted. However, since the number of parts increases in both cases, it is preferable to integrate the support base and the guide portion as described above in order to reduce the number of parts.

Although the leaf spring 18 is fixed to the upper surface of the support base 14 with screws, for example, if the end portion of the leaf spring is bent downward, the leaf spring is fixed to the side surface of the support base 14. It is also possible to provide a structure in which the leaf spring is elastically deformed with the swing of the balance even if another support base is provided exclusively for the leaf spring. Even in these cases, if the balance is supported from the lower surface and the side surface by the support base and the guide portion, the balance can be swingably supported only by placing the balance on the support base. However, since the leaf spring 18 has the simplest shape and can be easily attached to the support base 14, it is very useful in consideration of the manufacturing cost and the assembly cost of parts.

The pedal mechanism is a loud pedal,
It can be used as any pedal mechanism such as a soft pedal or a damper pedal.

[Brief description of drawings]

FIG. 1 shows a pedal mechanism as an embodiment, (a)
Is a front view showing a part thereof, and (b) is a plan view showing a part thereof.

FIG. 2A is a perspective view showing a support base and a guide portion of the pedal mechanism, and FIG. 2B is a perspective view showing another support base and a guide portion.

FIG. 3 is a perspective view showing a pedal mechanism of a general upright piano.

FIG. 4 is a front view showing a pedal mechanism as a first conventional example.

FIG. 5 is a front view showing a pedal mechanism as a second conventional example.

FIG. 6 is a front view showing a pedal mechanism as a third conventional example.

[Explanation of symbols]

10 ... Bottom plate, 12, 32 ... Guide part, 14, 3
4 ... Support base, 16 ... Screw, 18 ... Leaf spring,
20 ... Balance, 22 ... Balance bolt, 24 ... Pedal, 26 ... Lift bar.

Claims (3)

(57) [Claims] 1. A balance provided on a bottom plate of a piano so as to be swingable, and the balance is swung by a stepping / release operation of a pedal connected to one end of the balance. A pedal mechanism of an upright piano configured to raise / lower a hoisting rod mounted at the other end, wherein the balance is mounted on an upper surface side of a support base, and the vicinity of a central portion of the balance is arranged from below. A pedal mechanism for an upright piano, which is structured to support a side surface of the balance and to bring a guide portion into contact with the side surface of the balance to restrict movement of the balance in the width direction. 2. The pedal mechanism for an upright piano according to claim 1, wherein a pair of projecting objects serving as the guide portions are formed on an upper surface side of the support base, and the balance is placed between the projecting objects. An upright piano pedal mechanism characterized by being placed so as to be sandwiched. 3. The pedal mechanism for an upright piano according to claim 1, wherein the leaf spring is fixed to the support base in a cantilever shape, and the balance is provided on the upper surface side of the leaf spring. A pedal mechanism for an upright piano, characterized in that the balance is structured so as to swing while elastically deforming the leaf spring when the pedal is depressed.