JP2002323887A - Pedal structure of grand piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the height of a pedal freely adjustable with a relatively simple structure. SOLUTION: A through-hole 21 is formed at a pedal box 4 and a pedal pin 8 is inserted therein. Both flanks of the pedal box 5 are respectively fitted with lock screws 23 and these lock screws 23 are tightened to press their front ends to the pedal pin 8, by which the pedal box 8 is height adjustably fixed to the pedal pin 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pedal device for a grand piano, and more particularly to a pedal device capable of freely adjusting the height of a pedal.

[0002]

2. Description of the Related Art FIG. 16 is an external perspective view of a conventional grand piano. In FIG. 1, a reference numeral 1 denotes a grand piano, which includes a piano body 2 and a pedal device 3. The piano body 2 has three columns 5, and the pedal device 3 is vertically provided below the front end. The pedal device 3 includes a pedal box 5 arranged below the piano main body 2, and three pedals 6 (a damper pedal 6 A, a soft pedal 6 B, and a sostenuto pedal 6 C) which are depressed by the toes in the pedal box 5. The movement of each of the pedals 6 is transmitted to a damper mechanism, a weak sound mechanism, and a sostenuto mechanism in the piano body 2 by a pedal push-up bar 7 movably arranged at the rear of the pedal box 5 so as to move the strings. The sound is controlled by controlling the vibration of the sound and the performance effect is enhanced. The pedal box 5 is fixed to lower ends of two pedal posts 8 and a poke bar 9 which are suspended from the front end of the lower surface of the piano body 2 with an appropriate interval from the floor.

[0003]

As described above, in the pedal device 3 of the conventional grand piano 1, the pedal box 5 is fixed to the lower end of the pedal pole 8 and the rod 9 protruding from the lower surface of the piano body 2. The pedal box 5 is provided with a pedal 6 rotatably, and the rear end thereof is connected to the lower end of the pedal push-up rod 7. That is, the height of the pedal 6 from the floor is fixed, and the pedal 6 cannot be freely adjusted. For this reason, when an infant or the like performs, even if the height of the chair is adjusted to be low, the feet may not reach the pedal 6 sufficiently, and there is a problem that the performance is hindered.

Therefore, as a method for solving the above problem,
For example, Japanese Utility Model Laid-Open No. 59-158190,
It is known to use an auxiliary pedal device disclosed in, for example, Japanese Patent No. 44145. Although the above-mentioned problem can be solved by using such an auxiliary pedal device, this type of auxiliary pedal device correctly transmits the motion of the auxiliary pedal to the pedal 6 if the auxiliary pedal is not properly attached to the pedal 6. The height of the auxiliary pedal,
Further, a mechanism for adjusting the position, angle, and the like in the front-rear direction is required. Therefore, there is a problem that the number of parts increases, the apparatus itself becomes complicated and large, and it is not only difficult to handle but also expensive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a ground which is capable of freely adjusting the height of a pedal with a relatively simple structure. An object of the present invention is to provide a piano pedal device.

[0006]

According to a first aspect of the present invention, there is provided a pedal box provided below a piano body, and a pedal provided on the pedal box and operated by a foot. The pedal box is attached to a pedal column vertically suspended from a lower surface of the piano body so as to be adjustable in a height direction. In the present invention, the height of the pedal can be adjusted by moving the pedal box up and down along the pedal column.

[0007] A second invention is the first invention, wherein
A rack is provided on the pedal post, and a pinion is provided on the pedal box so as to mesh with the rack. In this invention, when the pinion rotates along the rack, the pedal box can be moved up and down along the pedal post.

[0008] In a third aspect based on the first aspect,
It comprises a ball screw for vertically connecting the pedal box to the pedal post, and a drive motor for rotating the pedal post. In this invention, when the pedal column is rotated by driving the drive motor, the pedal box can be moved up and down along the pedal column by the action of the ball screw.

[0009] A fourth aspect of the present invention is directed to the first, second or third aspect.
In the invention, the pedal is connected to the pedal push-up rod so as to be adjustable in the height direction. In the present invention, when the height of the pedal box is adjusted, the height of the pedal relative to the pedal push-up rod can also be adjusted.

According to a fifth aspect of the present invention, there is provided a pedal box disposed below a piano body, a pedal provided on the pedal box and operated by a foot, and the pedal box being moved at least in a height direction with respect to the piano body. And a link mechanism that adjustably couples to the link. In the present invention,
The height of the pedal box can be adjusted by a link mechanism.

According to a sixth aspect of the present invention, there is provided a pedal box disposed below a piano body via a pedal column, and a pedal provided in the pedal box and operated by a foot, wherein the pedal column is configured to be extendable and contractible. It was done. In this invention, the height of the pedal box can be adjusted by expanding and contracting the pedal column.

According to a seventh aspect, in the first to sixth aspects, a flexible wire is connected to the pedal in place of the pedal push-up rod. In a piano using a pedal push-up bar, when moving the pedal box up and down, it is necessary to change the length of the pedal push-up bar by moving the pedal up and down with respect to the pedal push-up bar in advance. Since a flexible wire is used in place of the pedal push-up rod, it is not necessary to change the length of the wire, and the movement of the pedal can be reliably transmitted to the wire.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is an external perspective view showing a first embodiment of a grand piano pedal device according to the present invention, FIG. 2 is a side view showing a part of the pedal device, and FIG. 3 is a fixing structure of a pedal box. Sectional view of a main part showing
FIG. 4 is a sectional view showing a connection structure between the pedal and the pedal push-up bar. In the drawings, the same components as those shown in the section of the prior art are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In these figures, the reference numeral 10 denotes a pedal device, 11 denotes a floor, and 12 denotes a pedal cover fixed to a lower surface of a shelf of a piano body.

The pedal device 10 includes a pedal box 5, three pedals 6 (a damper pedal 6 A, a sostenuto pedal 6 B, and a soft pedal 6 C) disposed in the pedal box 5. It is composed of three pedal push-up rods 7 arranged respectively corresponding to the pedals 6, two left and right pedal posts 8 and a push rod 9 for supporting the pedal box 5, the pedal cover 12 and the like. ing. The damper pedal 6A, the sostenuto pedal 6B, and the soft pedal 6C are slightly different in the shape of the front end to be depressed, and all have the same mounting structure with respect to the pedal box 5. The pedal is referred to as a pedal 6, and the description of each pedal will be omitted.

The pedal box 5 has two pedal pole holes 21 penetrating vertically and the respective pedal poles 8 penetrating therethrough, and three pedal mounting holes 22 penetrating back and forth and penetrating the pedal 6.
And is fixed to the lower end of the pedal post 8 by fixing screws 23 provided on both side surfaces. Fixing screw 23
Is screwed into a screw hole 25 provided in the side plate of the pedal box 5 as shown in FIG.
The pedal box 5 is fixed to the pedal post 8 by pressing the other side against the hole wall of the pedal post hole 21. The pedal post 8 has an upper end fixed to the lower surface of the pedal cover 12 and a lower end provided with a pin 26 for preventing the pedal box 5 from falling off.

The piercing rod 9 is configured to be telescopic. The pedal cover 12 is fixed to the lower surface of the shelf of the piano body 2 (FIG. 16).

In FIG. 2 and FIG.
A horizontal support shaft 30 for rotatably supporting the pedal 6 is provided via a bracket 31 inside the bracket. The pedal 6 is disposed in the pedal box 5 so as to pass through the pedal mounting hole 22, and a longitudinal middle portion is pivotally supported by the support shaft 30 so as to be vertically rotatable. The spring has a rotation behavior in the return direction. Rear end 6a of pedal 6 projecting backward from pedal box 5
Is connected to the lower end of the pedal push-up rod 7 by two sets of double nuts 33 (nuts 33A and 33B) so as to be adjustable in the height direction and swingable. For this reason,
The rear end 6a of the pedal 6 has a through hole 3
The pedal push-up rod 7 is formed in the through hole 35.
Is inserted through the lower end. The through hole 35 has a hole diameter larger than the outer diameter of the pedal push-up bar 7, thereby enabling the pedal 6 to swing. At the lower end of the pedal push-up bar 7, a large-diameter portion 7a for preventing the pedal from coming off is provided. Note that the pedal push-up bar 7 is disposed substantially vertically.

The two sets of double nuts 33 are screwed to a male screw 36 formed on the outer peripheral surface of the lower end of the pedal push-up rod 7 to swingably hold the rear end 6a of the pedal 6. . Of the double nut 33, the contact surface of the nut 33A that contacts the front surface (or the back surface) of the rear end portion 6a of the pedal 6 with the rear end portion 6a is formed as a convex spherical surface 38. 6 is smooth and easy.

In the pedal device 10 having such a structure, when adjusting the height of the pedal 6, first, the two sets of double nuts 33 are loosened and the pedal 6 is lifted up by the pedal push-up rod 7.
To be able to move up and down. Next, the fixing screw 23 is loosened and the pedal box 5 is moved to the required height position along the pedal post 8 to check whether or not the player's foot reaches the upper surface of the front end of the pedal 6 sufficiently. When the foot reaches the pedal 6, the fixing screw 23 is tightened to firmly fix the pedal box 5 to the pedal post 8, and when it does not reach, the pedal box 5 is further moved so as to reach and the height is adjusted. Fix it. Pedal box 5
After adjusting the height, the double nut 33 is tightened so that the pedal 6 does not move up and down with respect to the pedal push-up rod 7.

As described above, the pedal device 10 according to the present invention.
Since the pedal box 5 is attached to the pedal column 8 so as to be adjustable in the height direction, the conventional auxiliary pedal device is not required, and even a child or the like can easily play the pedal 6 at the height position. And the movement of the pedal 6 can be reliably transmitted to the pedal push-up bar 7.

Further, the structure is extremely simple, there is no need to provide a special mechanism, and the height adjustment of the pedal box 5 with respect to the pedal post 8 and the height adjustment of the pedal 6 with respect to the pedal push-up rod 7 are also easy and quick. Can be done.

FIG. 5 is a perspective view of a pedal device according to a second embodiment of the present invention. In this embodiment, guide grooves 40 are formed on both side surfaces of the pedal box 5 over the entire length in the height direction, and the pedal posts 8 are inserted into these grooves 40 so as to be relatively slidable. A long hole 41 opening on both sides is formed in the portion, and a fixing screw 23 is inserted into the long hole 41 and screwed into a screw hole formed in the pedal box 5 so that the pedal box 5 is The height is fixed so that it can be adjusted. The connection structure between the pedal 6 and the pedal push-up bar 7 is exactly the same as the connection structure shown in FIG.

Even in such a structure, the first
It is clear that the height of the pedal box 5 and the pedal 6 with respect to the pedal post 8 can be continuously adjusted by loosening the fixing screw 23 in the same manner as in the embodiment.

FIG. 6 is a side view of a pedal device showing a third embodiment of the present invention. In this embodiment, the pedal box 5 and the pedal cap 12 are connected by a link mechanism 50 so that the height can be adjusted and the movement can be adjusted in the front-rear direction. The pedal push-up rod is constituted by a flexible wire 51. ing. That is, in the present embodiment, instead of using the pedal post 8, the pedal box 5 is supported by the link mechanism 50 so as to be adjustable in height and movable in the front-rear direction, and a pedal push-up rod made of a rigid body is used. The pedal device 52 is configured by using a wire type push-up mechanism instead of the conventional push-up mechanism, and the poke rod 9 is omitted.

The link mechanism 50 comprises two parallel links 53A and 53B spaced apart in the front-rear direction, the upper end of which is rotatably fixed to the pedal cover 12 by a fixing screw 54, and the lower end of which is the same. Fixing screw 55
Thus, it is rotatably fixed to the pedal box 5.
The wire 51 has an upper end connected to a damper mechanism, a muffler mechanism, or a sostenuto mechanism (not shown) in the piano body 2, and a lower end connected to the rear end 6 a of the pedal 6. 5
6 is a guide ring for the wire 51.

In such a pedal device 52, when the fixing screws 54, 55 are loosened and the links 53A, 53B are rotated in the front-rear direction, the pedal box 5 rotates in the front-rear direction. Can be adjusted. At this time, since the pedal box 5 rotates with the links 53A and 53B as arms, not only the height but also the position in the front-rear direction is adjusted. After adjusting the height of the pedal 6, the fixing screws 54,
Tighten 55 and link 53A, 53B to pedal Kasagi 1
2 and the pedal box 5 are firmly fixed,
When the pedal is depressed, the pedal box 5 does not fall down, and a good performance can be performed.

In this embodiment, since the flexible wire 51 is used as the push-up mechanism,
The movement of the pedal 6 can be reliably transmitted to the mechanism on the piano body 2 side. That is, in the pedal device 10 shown in FIG. 1 using the pedal push-up bar 7 made of a rigid body, the mounting position and the length of the pedal push-up bar 7 are determined by the positional relationship between the pedal 6 and the mechanism on the piano body side. For this reason, the pedal box 5 cannot be moved back and forth (if it is moved, the pedal push-up bar is bent and does not operate), but in the case of the wire 51, its length can be made an appropriate length. Therefore, even if the pedal box 5 is moved in the front-rear direction, the pedal box 5 is not affected at all, and the movement of the pedal 6 is reliably transmitted. Further, since the wire 51 is used, there is no need to adjust the mounting position of the pedal 6 with respect to the wire 51.

FIG. 7 is a side view of a pedal device according to a fourth embodiment of the present invention. This embodiment is a modification of the above-described third embodiment.
A and 53B are formed with long holes 60 at their lower ends, and fixing screws 55 are inserted into these long holes 60 and screwed into the screw holes of the pedal box 5, so that the pedal box 5 is raised with respect to the link mechanism 50. It is configured to be adjustable so as to be adjustable and to be adjustable in the front-rear direction. Other configurations are the same as those of the third embodiment.

In such a structure, the fixing screw 5
When the link 5 is moved upward along the elongated hole 60, the length of the link becomes shorter, so that the height of the pedal box 5 is smaller than the embodiment shown in FIG. Can be adjusted in a large range, and the front-back direction can be adjusted in a small range.

FIG. 8 is a side view of a pedal device showing a fifth embodiment of the present invention. In this embodiment, two links 53A, 53B which cross a link mechanism 62 in an X-shape are shown.
And the upper end of one link 53A is
Is movably and rotatably connected to a long hole 63 provided in the front and rear direction by a fixing screw 54, and the lower end is rotatably fixed to the pedal box 5 by a fixing screw 55. Screw 54 for fixing the upper end to pedal cover 12
The lower end is rotatably and rotatably connected to a long hole 66 in the front-rear direction provided in the pedal box 5 by a fixing screw 55. Link 53
The intersection of A and the link 53B is relatively rotatably connected by a connecting screw 66. When the connecting screw 66 is tightened to firmly fix the two links 53A and 53B, the pedal box 5 is connected to the link 53A. , 53B at a height corresponding to the intersection angle. That is, if the intersection angle is increased, the height of the pedal box 5 can be increased,
It can be lowered by making it smaller.

According to such a link mechanism 62, the pedal box 5 can be moved up and down at the same position without moving in the front-rear direction, and only the height can be adjusted.

FIG. 9 is a perspective view of a pedal device showing a sixth embodiment of the present invention. In this embodiment, similarly to the first embodiment shown in FIG. 1, the pedal box 5 is attached to the pedal post 8 so that the height can be adjusted, and the footrest plate 70 is placed below the pedal box 5 in an L-shape. It is arranged horizontally by metal fittings 71, and the leg rest plate 70 is moved up and down together with the pedal box 5. As the height adjustment mechanism of the pedal box 5, the link mechanism 50 or 6 shown in FIGS.
Of course, 2 may be used.

According to such a pedal device, the leg rest plate 70 can be moved up and down integrally with the pedal box 5.

FIG. 10 is a perspective view of a pedal device showing a seventh embodiment of the present invention, FIG. 11 is a sectional view of the pedal device, and FIG. 12 is a perspective view showing a rack and a pinion. In this embodiment, the pedal box 5 is disposed on two pedal posts 8 so as to be vertically movable, a rack 80 is fixed to the back of each pedal post 8, and the pedal posts 8 are provided inside the pedal box 5. And two pinions 82 that mesh with the rack 80. The pinion 82 is fixed to a rotation shaft 83 rotatably provided on the pedal box 5. An operation knob 84 is provided at one end of the rotation shaft 83 protruding outside the pedal box. Therefore, when the knob 84 is gripped and rotated by hand, the pinion 82 rotates along the rack 80 and the pedal box 5 can be moved up and down along the pedal post 8. When the pedal box 5 is fixed to the pedal post 8, it is fixed using fixing screws 23 provided on both side surfaces of the pedal box 5 as in the first and sixth embodiments. Other structures are substantially the same as those of the first embodiment shown in FIG.

FIG. 13 is a perspective view of a pedal device showing an eighth embodiment of the present invention, and FIG. 14 is a sectional view of the pedal device. In this embodiment, two drive motors 90 capable of normal and reverse rotation are provided on the lower surface of the pedal cover 12, and pedal columns 8 are connected to output shafts of these drive motors 90, respectively. The pedal box 5 is arranged to be vertically movable by a ball screw 91. The ball screw 91 is a male screw 92 formed on each pedal post 8.
And a ball 93 provided in the pedal box 5 and engaged with a thread groove of each male screw 92. That is, in the present embodiment, the pedal column 8 is rotatably provided on the drive motor 90, and the pedal column 8 is used as a screw rod. Other structures are substantially the same as those of the first embodiment.

According to such a pedal device, when the pedal column 8 is rotated by the drive motor 90, the pedal box 5 can be moved up and down by the screw action of the ball screw 91. There is no need to move the box 5 up and down, and the height of the pedal box 5 can be easily adjusted. Further, since the ball screw 91 is used, the drive motor 90
And a small motor can be used. In addition, the pedal box 5 does not move up and down and is held at that position unless the two pedal posts 8 rotate in the same direction.
It is not necessary to use the fixing screw 23 shown in FIG. 1, FIG. 9 and FIG.

FIG. 15 is a perspective view of a pedal device showing a ninth embodiment of the present invention. In this embodiment, the pedal column 8 is configured to be extensible by two pipes 100 and 101 having different outer diameters, and the length of the pedal column 8 is adjusted by a nut 102 and a tightening ring (not shown). It is. The pipe 100 has an outer diameter larger than that of the pipe 101, the upper end is fixed to the lower surface of the pedal cover 12, and a flexible tightening ring is fixed to the lower end side.
The tightening ring has a cylindrical shape at the base end and has the pipe 100
Is fixed to the lower end portion, and has a tapered tip portion and a plurality of slits formed as a tapered portion formed at equal intervals in the circumferential direction, and protrudes below the pipe 100.

The small diameter pipe 101 is slidably inserted at the upper end thereof into the large diameter pipe 100 via the tightening ring so as to be prevented from coming off, and the pedal box 5 is fixed to the lower end side. The small-diameter pipe 101 is moved up and down to move the pedal box 5
When the nut 102 is tightened after adjusting the height thereof, the nut 102 reduces the diameter of the tapered portion of the tightening ring and presses against the outer periphery of the small-diameter pipe 101. Is fixed to the large-diameter pipe 100. Therefore, even with such a structure, the same effects as those of the above-described first to eighth embodiments can be obtained.

It should be noted that the present invention is not limited to the above-described embodiment at all, and can be appropriately changed and modified without departing from the scope described in the claims of the present invention. For example, in all embodiments, a flexible wire 51 may be used instead of using the pedal push-up bar 7.

[0040]

As described above, the pedal device for a grand piano according to the present invention has a simple structure, a small number of parts, is easy to handle, does not require a conventional auxiliary pedal device, and is suitable for infants and the like. The pedal can also be adjusted to a height position at which the player can easily play, and the movement of the pedal can be reliably transmitted to the push-up mechanism.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a first embodiment of a pedal device for a grand piano according to the present invention.

FIG. 2 is a side view showing a part of the pedal device in a cutaway manner.

FIG. 3 is a sectional view of a main part showing a fixing structure of the pedal box.

FIG. 4 is a sectional view showing a connection structure between a pedal and a pedal push-up bar.

FIG. 5 is a perspective view of a pedal device according to a second embodiment of the present invention.

FIG. 6 is a side view of a pedal device according to a third embodiment of the present invention.

FIG. 7 is a side view of a pedal device according to a fourth embodiment of the present invention.

FIG. 8 is a side view of a pedal device according to a fifth embodiment of the present invention.

FIG. 9 is a perspective view of a pedal device according to a sixth embodiment of the present invention.

FIG. 10 is a perspective view of a pedal device according to a seventh embodiment of the present invention.

FIG. 11 is a sectional view of the pedal device.

FIG. 12 is a perspective view of a rack and a 4-pinion.

FIG. 13 is a perspective view of a pedal device according to an eighth embodiment of the present invention.

FIG. 14 is a sectional view of the pedal device.

FIG. 15 is a perspective view of a pedal device according to a ninth embodiment of the present invention.

FIG. 16 is a perspective view of a piano grand piano provided with a conventional pedal device.

[Explanation of symbols]

1 ... grand piano, 3 ... piano body, 4 ... pedal box,
5 pedal, 6 pedal lifting rod, 7 pedal column, 10
... Pedal device, 21 ... Pole hole, 23 ... Fixing screw, 50 ... Link mechanism, 51 ... Wire, 80 ... Rack,
82: pinion, 90: drive motor, 91: ball screw.

Claims (7)

[Claims] 1. A pedal box provided below a piano body, and a pedal provided on the pedal box and operated by a foot, wherein the pedal box is mounted on a pedal column vertically suspended from a lower surface side of the piano body. A pedal device for a grand piano, which is mounted so as to be adjustable in the height direction. 2. The pedal device for a grand piano according to claim 1, wherein a rack is provided on the pedal post, and a pinion that meshes with the rack is provided on the pedal box. 3. The pedal device for a grand piano according to claim 1, further comprising: a ball screw for connecting a pedal box to a pedal column so as to be vertically movable, and a drive motor for rotating the pedal column. Grand piano pedal device. 4. The pedal device for a grand piano according to claim 1, wherein the pedal is connected to the pedal push-up bar so as to be adjustable in the height direction. 5. A pedal box disposed below the piano body, a pedal provided on the pedal box and operated by a foot, and the pedal box being adjustable at least in a height direction with respect to the piano body. A pedal device for a grand piano, comprising a link mechanism for coupling. 6. A pedal box which is disposed below a piano body via a pedal column, and a pedal provided on the pedal box and operated by a foot, wherein the pedal column is configured to be extendable and contractible. And grand piano pedal device. 7. The pedal device for a grand piano according to claim 1, wherein a flexible wire is connected to the pedal in place of the pedal push-up bar. Grand piano pedal device.