JPH10207449A - Upright piano pedal mechanism - Google Patents

Abstract

(57) [Problem] To provide an upright piano pedal mechanism which can be more easily assembled than before. A pedal mechanism is fixed to an upper surface of a bottom plate, and a support base having a pair of guide portions protrudingly provided on the upper surface side.
4 and a screw 16 between the guide portion 12 on the upper surface of the support base 14.
, A balance 20 mounted on the upper surface side of the leaf spring 18, a pedal 24 connected to one end of the balance 20 via a balance bolt 22, and a balance 20.
, And a lifting rod 26 mounted on the other end. Balance 2
Since 0 is only mounted on the support base 14, it can be assembled very easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pedal mechanism for an upright piano.

[0002]

2. Description of the Related Art Conventionally, there has been known an upright piano pedal mechanism as shown in FIG. 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 release operation is performed, the balance 54 swings, and the lifting 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 FIG. 0, when the soft pedal 60 is connected to one end of the balance 64 and the soft pedal 60 is depressed / released, the balance 64 swings and the lifting bar 66 mounted on the other end of the balance 64 moves up / down. Was configured to.

[0003] By the way, various mounting structures for the balance 54 in such a pedal mechanism are conventionally known. For example, in a pedal mechanism shown in FIG. 4 as a first conventional example, a bracket 71 is fixed to an upper surface of a bottom plate 52 with a screw 70, and a balance fitting 73 is fixed to a lower surface of the balance 54 with a screw 72. The balance 54 is connected to the balance fitting 73 via a support shaft 74 so that the balance 54 is swingably supported. Further, spring supports 75 and 76 are attached to the upper surface of the bottom plate 52 and the lower surface of the balance 54 by screws 77. , 78
By interposing a balance spring 79 between these spring receivers 75 and 76, the balance spring 79 that is compressed when the loud pedal 50 is depressed is moved.
The balance 54 is pushed up during the release operation of the
0 was returned to the initial position.

Here, in FIG. 4, screws 70, 72,
Since 77 and 78 are actually screwed into each part, they cannot be seen from the front as shown in FIG.
In FIG. 4, each screw is drawn by a solid line to indicate the presence of each screw. (The screws are also drawn by solid lines in FIGS. 5, 6, and 1 described below.) However, in the case of such a pedal mechanism, the bracket 71 is used.
And the balance fittings 73 must be accurately fixed to appropriate positions, and connected by the support shaft 74 while keeping their bearing holes aligned with each other. Was. There is also a disadvantage that the number of components is larger than in the second and third conventional examples described later, which is disadvantageous in cost.

On the other hand, in a pedal mechanism shown in FIG. 5 as a second conventional example, a U-shaped leaf spring 82 is fixed to an upper surface of a bottom plate 52 and a lower surface of a balance 54 by screws 80.
At the same time as the balance 54 is swingably supported by the leaf spring 82, the leaf spring 82 that is elastically deformed when the loud pedal 50 is depressed is moved by the leaf spring 82 when the loud pedal 50 is released.
To return the loud pedal 50 to the initial position. Such a pedal mechanism is advantageous in terms of cost because it has fewer parts than the first conventional example.

However, in the case of such a pedal mechanism, the swing center of the balance 54 varies greatly depending on the characteristics of the leaf spring 82, and it is difficult to specify the swing center. Designing the location was not easy. Also, the head of each screw 80 is a leaf spring 8
Insert your hand in the narrow space to come inside
There was also a disadvantage that the work of tightening 0 was troublesome.

On the other hand, in a pedal mechanism shown in FIG. 6 as a third conventional example, a support base 90 is fixed on an upper surface of a bottom plate 52,
A flat leaf spring 9 is screwed onto 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 leaf spring 94 with a screw 96, so that the balance 54 is swingably supported by the support table 90 and the leaf spring 94. Further, the leaf spring 94 that is elastically deformed when the loud pedal 50 is depressed, pushes up the balance 54 when the loud pedal 50 is released, and returns the loud pedal 50 to the initial position. 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 that of the second conventional example. Was.

However, in the case of such a pedal mechanism,
After the leaf spring 94 is fixed to the support table 90, the balance 54 must be attached to the leaf spring 94. Therefore, the head of the screw 96 faces the bottom plate 52 side, and the hand is also inserted into the narrow space. There is a disadvantage that the work of tightening the screw 96 takes time.

That is, all of the above three types of pedal mechanisms have the disadvantage that the assembly is troublesome because the support structure of the balance is complicated or the screw tightening operation is not easy. Further, the problems concerning the mounting structure of the balance 54 in such a loud pedal mechanism are completely 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 the balance. Had similar problems.

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

[0011]

Means for Solving the Problems and Effects of the Invention In order to achieve the above object, the invention according to claim 1 comprises a balance slidably disposed on a bottom plate of a piano,
A pedal of an upright piano, wherein the balance is swung by a stepping / release operation of a pedal connected to one end of the balance, and a lifting rod mounted on the other end of the balance is raised / lowered. In the mechanism, the balance is mounted on the upper surface side of the support table, and the vicinity of the center of the balance is supported from below, and a guide unit is brought into contact with a side surface of the balance,
The balance is configured to restrict movement in the width direction.

In this pedal mechanism, the balance is mounted only on the upper surface side of the support, and is not connected to the support. 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 since the guide portion is in contact with the side surface of the balance, the balance is mounted. The position does not shift in the width direction of the balance. Therefore, if one end of the balance connected to the pedal side moves up and down in accordance with the operation of the pedal, the balance will swing around the support base as the swing center.

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

By the way, in this pedal mechanism, the specific shape of the guide portion is not particularly limited as long as 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. However, as described in claim 2, a pair of protrusions serving as the guide portion is formed on the upper surface side of the support table, and disposed so as to sandwich the balance between the protrusions. The projecting object that sandwiches the balance on the upper surface side of the support stand contacts the side surface of the balance and functions as a guide part, which is different from a structure in which a member different from the support base is arranged as the guide part. In this case, the number of parts is reduced, and the assembling operation is less time consuming. In addition, the vicinity of the upper surface of the support is near the center of swing of the balance, and the vertical displacement of the balance is smaller than the vicinity of both ends of the balance. If so, the height dimension of the guide portion can be suppressed, and a more compact structure can be achieved.

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 return the pedal to the initial position promptly. As described in 3, the leaf spring is fixed to the support base in a cantilever manner, and the balance is mounted on the upper surface side of the leaf spring, and the balance is mounted when the pedal depresses the pedal. It is preferable to have a structure that swings while elastically deforming.

According to this pedal structure, when the balance swings and the leaf spring flexes, the leaf spring acts on the balance to return the balance to the initial position. When the operation is performed, the pedal is returned to the initial position by the force of the leaf spring. Even in such a structure, since the balance is only mounted on the upper surface side of the leaf spring, it takes no time to attach the balance. In particular, since the leaf spring may be fixed to the support before mounting the balance, the leaf spring can be easily fixed in a cantilever shape with screws or the like, and a pedal structure using the leaf spring is used. Even so, the screw tightening operation becomes much easier as compared with the structures of the second and third conventional examples.

[0017] In addition to the configuration described in claim 3, there are various structures in which a spring or the like is connected to the movable portion (for example, a balance) of the pedal mechanism and the movable portion is biased to the initial position by the spring or the like. You can think. More specifically, for example, the first
It is also possible to adopt the balance spring as shown as a conventional example in the pedal mechanism of the present invention. Even in this case, the balance is mounted on the upper surface side of the support base and the vicinity of the center of the balance is lower. In addition to supporting the balance from the side of the balance, the guide portion is brought into contact with the balance to restrict the movement of the balance in the width direction, thereby facilitating the mounting work of the balance. The effect remains the same. However, in the case of the first conventional example, it is necessary to mount the upper and lower spring supports and the like in an appropriate positional relationship, and this mounting work also requires a considerable amount of time. If it is, only one leaf spring needs to be attached, so that the attaching operation is easy.

[0018]

Next, an embodiment of the present invention will be described with reference to an example. As shown in FIGS. 1A and 1B, a pedal mechanism according to the embodiment has a bottom plate 1.
0, a pair of guides 12 projecting from the upper surface, and a guide 1 on the upper surface of the support 14.
A leaf spring 18 fixed in a cantilever shape with screws 16 between the two
A balance 20 mounted on the upper surface side of the leaf spring 18, a pedal 24 connected to one end of the balance 20 via a balance bolt 22, a lifting rod 26 mounted on the other end of the balance 20, and the like. ing.

As shown in FIG. 2A, the support table 14 is formed by cutting wood to form a guide 12 on the upper surface.
As shown in FIG. 2B, a support table 34 in which a guide plate 32 is formed by bending a metal plate.
It may be. 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 and is vertically With free end displaceable in any direction)
The fixed position of the plate spring 94 (FIG. 6)
Reference), but is different from the leaf spring 94 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 depressed, one end of the balance 20 is pulled downward via the balance bolt 22, and the balance 20 is pivoted around the support table 14. Rocks. Here, the balance 20 is only mounted on the support base 14, but the balance 20 hardly moves in the longitudinal direction because the balance bolt 22 is moved only in the vertical direction. Although the balance 20 is rotatable around the balance bolt 22 with respect to the balance bolt 22, such movement is restricted because the guide portion 12 is in contact with the side surface of the balance 20. Therefore, even though the balance 20 is not connected to the support 14 at all, the mounting position does not shift and swings in response to the operation of the pedal 24.

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

According to the pedal mechanism as described above,
Simply mount the balance 20 on the support base 14 and
Since the connection with the side and the mounting of the lifting rod 26 may be performed,
For example, the work of connecting the balance and the bracket via the support shaft as in the first conventional example is unnecessary, and the troublesome screw tightening work as in the second and third conventional examples is 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 components is reduced as compared with a case where these are formed as separate components, so that the assembling operation can be easily performed. In addition, since the guide portion 12 abuts on the balance 20 near the center of swinging, the size of the guide portion 12 in the height direction is suppressed, and the guide portion 12 becomes compact.

Further, since the plate spring 18 is fixed to the support table 14 in a cantilever shape and the balance 20 is mounted on the upper surface thereof, the balance 20 can be connected without connecting the plate spring 18 and the balance 20. Can be returned to the initial position by the force of the leaf spring 18, and the work of mounting the leaf spring 18 is not troublesome.

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

The leaf spring 18 is fixed to the upper surface of the support 14 with screws. For example, if the end of the leaf spring is bent downward, the leaf spring is fixed to the side surface of the support 14. It is also possible to provide a structure in which the leaf spring is elastically deformed in accordance with the swing of the balance, even if another support table 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 supported swingably only by mounting 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 extremely useful even in consideration of the manufacturing cost and the assembly cost of parts.

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

[Brief description of the drawings]

FIG. 1 shows a pedal mechanism as an embodiment, and FIG.
FIG. 2 is a front view showing a part thereof, and FIG. 2B is a plan view showing the same part.

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

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,
Reference numeral 20: balance, 22: balance bolt, 24: pedal, 26: lifting rod.

Claims (3)

[Claims] 1. A balance provided on a bottom plate of a piano so as to be swingable, wherein the balance swings by a depression / release operation of a pedal connected to one end of the balance, and the balance is swung. In a pedal mechanism of an upright piano configured to raise / lower a lifting bar mounted at the other end, the balance is mounted on an upper surface side of a support base, and a portion near a center of the balance is viewed from below. A pedal mechanism for an upright piano, wherein the pedal mechanism is configured to support the guide and abut against a side surface of the balance to restrict movement of the balance in a width direction. 2. The pedal mechanism for an upright piano according to claim 1, wherein a pair of protrusions serving as the guide portions are formed on an upper surface side of the support base, and the balance is positioned between the protrusions. A pedal mechanism for an upright piano, which is arranged so as to sandwich it. 3. The pedal mechanism for an upright piano according to claim 1, wherein a leaf spring is fixed to the support base in a cantilever manner, and the balance is mounted on an upper surface side of the leaf spring. A pedal mechanism for an upright piano, wherein the pedal mechanism is mounted to swing the plate spring while elastically deforming the leaf spring when the pedal is depressed.