JP2018106185A - Auxiliary pedal device for piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an auxiliary pedal device for a piano which is easy to be mounted on a pedal of a piano and adjusted in its height.SOLUTION: A main pole 20 for supporting a playing pedal 30 and a pedal fixing portion 40 for fixing a pedal of a piano are attached to a base plate 10, and the playing pedal 30 has a pedal portion 31, a slide shaft 32 attached to the pedal portion 31, and a female threaded portion 32c provided on the slide shaft 32. The main pole 20 has an insertion hole into which the slide shaft 32 is inserted, a lock hole 22 for supporting the slider shaft 32, and plural saucer portions 23 provided around the lock hole 22. By screwing a lock bolt 50 having a convex portion 52 which engages with the saucer portion 23 and supports and fixes the slide shaft 32 to the main pole 20 into a female threaded portion 32c of the slide shaft 32, engaging the convex portion 52 to the predetermined saucer portion 23, and adjusting the height of the playing pedal 30, the slide shaft 32 is supported and fixed.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an auxiliary pedal device for a piano, and more particularly to an auxiliary pedal device for a piano used when a player's foot sitting on a chair facing the piano does not reach.

  The lower part of the piano body is provided with a right pedal, a middle pedal, and a left pedal. In the grand piano, the right pedal is a damper pedal for sustaining the piano sound. When the pedal is depressed, the damper is released from the string, and the string can vibrate for a long time even when the finger is released from the keyboard. The middle pedal is a sostenuto pedal that leaves only the damper of the pressed key away from the string, leaving only the sound, and the left pedal slightly changes the tone by shifting the position of the string as well as the volume. This is a shift pedal.

  In an upright piano, the right pedal is a damper pedal, the middle pedal is a muffler pedal that lowers the volume by placing a thin felt between the hammer and the string, and the left pedal is close to the actual hammer. A soft pedal for softening the sound.

  When the performer depresses the pedal during performance, a pedal effect corresponding to the pedal is obtained.

  By the way, the pedal provided in the above-mentioned piano has a constant height, and is usually determined in consideration of an operation when an adult plays. For this reason, when a child plays, there is a problem that the pedal does not reach the pedal and cannot be operated.

  Therefore, it is conventionally known to use a piano auxiliary pedal device that raises the pedal of the piano so that the pedal can be operated. As such an auxiliary pedal device for piano, there is one proposed in Patent Document 1, for example. FIG. 17 is an exploded perspective view showing a conventional auxiliary pedal device for a piano.

  As shown in FIG. 17, the above-described piano auxiliary pedal device 100 includes a fixing member 112 that is formed in a rectangular box shape on a fixing portion 111 that is fixed to the piano pedal 102, and the fixing member 112 and the pedal 102. Is provided with an upper clamping plate 113 and a lower clamping plate 114 for clamping the upper and lower sides thereof. A soft member 112 a made of a soft material such as rubber, felt, soft resin, or sponge is attached to the surface of the fixing member 112 that contacts the pedal 102. Similarly to the fixing member 112, the lower clamping plate 114 is provided with a soft member 114 a made of a soft material on the surface in contact with the pedal 102. The lower clamping plate 114 is provided with opening holes A that open on both sides of the soft member 114a, and bolts 114d are inserted into the opening holes A with washers 114c interposed. The bolt 114d is fixed to the lower clamping plate 114 by inserting and fastening the nut 14b from the tip.

  The upper holding plate 113 is fixed to the upper portion of the fixing member 112 with screws 113c, and has an opening hole B into which a bolt 114d fixed to the lower holding plate 114 is inserted on both sides. The upper holding plate 113 fixed to the fixing member 112 is inserted into the opening hole B with the bolt 114d fixed to the lower holding plate 114 and fastened by the wing nut 113b through the washer 113a, thereby lowering the lower holding plate 114. Support.

  Further, the fixing member 112 to which the upper clamping plate 113 and the lower clamping plate 114 are attached has an extension portion 115 extending upward and a performance extending by bending at a substantially right angle from the tip of the extension portion 115. A transmission unit 118 on which a person puts his / her foot is supported. Here, the extending portion 115 includes an L-shaped first plate member 117 screwed to the fixing member 112 and an L-shaped second plate member 116 screwed to the transmission portion 118. Yes. The first plate member 117 is formed with a plurality of through holes C opened on the surface extending upward from the fixing member 112. The second plate member 116 is formed with a plurality of through holes D that are elongated and open on the surface extending downward from the transmission portion 118. As shown in FIG. 17, the first plate member 117 and the second plate member 116 are coupled to each other by inserting bolts 116a together with through holes C and D formed on the surface and fastening them with nuts 117a. Fixed. At this time, the length of the extending portion 115 formed of the first plate member 117 and the second plate member 116 can be freely adjusted by shifting and fixing the positions of the through holes C and D into which the bolts 116a are inserted. it can.

JP 2001-56680 A

  In the thing of above-mentioned patent document 1, in order to adjust the height of a pedal, the length of the extension part 115 which consists of the 1st board member 117 and the 2nd board member 116 is made into the through-hole C which inserts the volt | bolt 116a. , D is shifted and fixed. However, in order to adjust the height, it is necessary to remove the bolt 116a, change the positions of the through holes C and D, and retighten the bolt 116a. This work must be performed in a narrow place on the piano pedal, which is cumbersome. Also, if the height is adjusted each time a student changes, such as in a piano classroom, the adjustment time will be longer, and the student will have to wait during that time, making it unsuitable for use in a piano classroom. There was a problem.

  In addition, it is important to quickly and surely attach the piano auxiliary pedal device to the piano pedal in a contest with a time limit. However, in the above-mentioned Patent Document 1, the piano pedal is attached to the pedal and the height is adjusted. There were problems such as requiring a lot of time.

  The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide an auxiliary pedal device for a piano that can be easily adjusted in height.

  In the piano auxiliary pedal device according to the present invention, a main pole for supporting the performance pedal at a predetermined height and a pedal fixing portion for fixing the piano pedal are attached to the base plate, and the performance pedal includes the pedal portion. And a slide shaft attached to the pedal portion, and at least one female screw portion provided on the slide shaft. The main pole includes an insertion hole into which the slide shaft is inserted, and the slider shaft. It has a lock hole having a predetermined length above and below to support and a plurality of saucers provided around the lock hole, and engages with the saucer to support and fix the slide shaft to the main pole. A lock bolt having a projecting part is screwed into the female thread part of the slide shaft, and the projecting part of the lock bolt is predetermined. Is engaged with the saucer section to adjust the height of the play pedal, characterized in that supporting and fixing the slide shaft.

  Further, the lock bolt is provided with the convex portion between a shaft portion and a screw portion provided in the knob portion, the tray portion has a spherical surface, and the convex portion has a spherical body having the same diameter as the tray portion. May be formed.

  In addition, the saucer portion may be formed by continuously forming a saucer portion composed of a spherical surface that gradually decreases downward, and the saucer portion is deeply engraved with the same spherical shape as it is upward, and becomes shallow as it is downward. What is necessary is just to form.

  In addition, the base plate includes a holding portion that accommodates and holds a piano pedal and an attachment portion to which the main pole is attached, and the bottom surface of the attachment portion is tapered so that its thickness decreases toward the tip. Good.

  The holding portion includes a fixing portion having a pedal pressing plate that is supported so as to be movable up and down, and a recess provided with a base rubber that sandwiches the pedal with the pedal pressing plate. What is necessary is just to provide the positioning wall at the time of inserting the piano pedal in a front-end | tip part.

  In this invention, the slide shaft with the pedal portion is inserted into the main pole, the slide shaft is slid to a predetermined height, and the lock bolt is screwed into the female screw portion of the slide shaft, so that the convex portion of the lock bolt is attached to the tray portion. The slide shaft can be supported and fixed by engagement, and the performance pedal can be adjusted to a predetermined height by a simple operation of loosening and tightening the lock bolt.

It is a perspective view of the auxiliary pedal apparatus for pianos concerning embodiment of this invention. It is a front view of the auxiliary pedal apparatus for pianos concerning embodiment of this invention. It is a rear view of the auxiliary pedal apparatus for pianos concerning embodiment of this invention. It is a top view of the auxiliary pedal apparatus for pianos concerning embodiment of this invention. It is a bottom view of the auxiliary pedal apparatus for pianos concerning embodiment of this invention. It is a disassembled perspective view of the auxiliary pedal apparatus for pianos concerning embodiment of this invention. FIG. 3 is an enlarged cross-sectional view taken along line AA in FIG. 2. It is a cross-sectional enlarged view in the BB line of FIG. It is a front view of the main pole used for the auxiliary pedal apparatus for pianos concerning embodiment of this invention. It is a side view of the main pole and lock bolt which are used for the auxiliary pedal apparatus for pianos concerning embodiment of this invention. It is explanatory drawing which shows the state which attaches a lock bolt to the slide shaft inserted in the main pole used for the auxiliary pedal apparatus for pianos concerning this Embodiment, (a) is the state which attaches a lock bolt, (b) is a lock bolt. (C) shows a state where the lock bolt is loosened and moved. It is a front view which shows the state which raised the performance pedal upward. It is sectional drawing which shows the state which raised the performance pedal upward. It is a front view which shows the state which raised the performance pedal to the top. It is a perspective view which shows the state which attaches the auxiliary pedal apparatus for pianos of this invention to the pedal of a piano. It is a perspective view which shows the state which attached the auxiliary pedal apparatus for pianos of this invention to the pedal of the piano. It is a disassembled perspective view which shows the conventional auxiliary pedal apparatus for pianos.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated in order to avoid duplication of description.

  As shown in FIGS. 1-8, the auxiliary pedal apparatus 1 for piano which concerns on this embodiment fixes the main pole 20 which supports the pedal 30 for performance to predetermined height on the baseplate 10, and the pedal of a piano. A pedal fixing portion 40 is attached.

  The performance pedal 30 includes a pedal portion 31 and a slide shaft 32 attached to the pedal portion 31. As shown in the plan view of FIG. 4, the pedal portion 31 of the performance pedal 30 is formed so as to increase in width from the piano side toward the rear in the same manner as the piano pedal, thereby facilitating depression. The surface of the pedal portion 31 is provided with a plurality of anti-slip grooves 33 that also serve as design.

  The pedal portion 31 and the slide shaft 32 are attached so as to be orthogonal to the surface of the pedal portion 31. In this embodiment, the slide shaft 32 is attached to the pedal portion 31 with a screw 34. The pedal portion 31 and the slide shaft 32 may be fixed together by welding or the like, in addition to being attached by screws. The pedal portion 31 and the slide shaft 32 are made of metal such as stainless steel or aluminum alloy, and in this embodiment, are made of duralumin.

  As shown in FIG. 6, the slide shaft 32 includes a slider portion 32a inserted into the insertion hole 21 of the main pole 20 and a pedal attachment portion 32b provided in connection with the slider portion 32a and having a smaller diameter than the slider portion 32a. The slider portion 32a is provided with two female screw portions 32c and 32d into which a male screw portion 51 of a lock bolt 50 described later is screwed. An oblong engagement protrusion 32e that engages with an engagement hole 35 provided in the pedal portion 31 is provided at the tip of the attachment portion 32b. The engagement protrusion 32e is fitted with a screw 34. A screw hole 32f is provided (see FIG. 7). In this embodiment, the slider portion 32a is provided with two female screw portions 32c and 32d. However, at least one female screw portion may be provided, and by increasing the number of female screw portions, as described later, The number that can be adjusted can be increased.

  The pedal 31 and the slide shaft 32 are attached by fitting the engagement protrusion 32e of the slide shaft 32 into the engagement hole 35 of the pedal 31 and screwing the screw 34 into the screw hole 32f.

  The base plate 10 includes a holding portion 11 that houses and holds a piano pedal, and an attachment portion 12 to which the main pole 20 is attached. The base plate 10 is tapered from the holding portion 11 toward the arc portion at the tip of the attachment portion 12. It is configured. The base plate 10 is made of a metal such as stainless steel or aluminum alloy. In this embodiment, the base plate 10 is made of duralumin, and the main pole 20 is attached to the attachment portion 12 on one end side with four screws 10a (see FIG. 5). ). A pedal fixing portion 40 made of stainless steel is attached to the central portion of the holding portion 11 on the other end side. The fixed frame 41 of the pedal fixing part 40 is formed in a lip groove shape, and both bent pieces 42 at the bottom part wrap around the lower side of the base plate 10 and are fixed to the base plate 10 with two screws 43, respectively. On the back surface of the base plate 10, a step portion 15 into which the bent piece 42 of the fixed frame 41 is fitted is provided.

  As shown in FIGS. 2 and 3, the bottom surface of the attachment portion 12 is tapered so that its thickness decreases toward the tip, and when the performance pedal 30 is depressed, the base plate 10 is placed on the floor. Is prevented from coming into contact.

  The holding portion 11 is provided with a recess 13, and a base rubber 14 is provided in the recess 13. The wall 13a at the tip of the recess 13 is used for positioning when a piano pedal is inserted, and the pedal pressing plate 46 and the base rubber 14 are in contact with the piano pedal against the wall 13a. Insert the pedal and fix it.

  As shown in FIG. 8, the fixing portion 40 is provided with a fixing bolt 60 to which a pedal pressing plate 46 is attached. For this reason, the boss | hub part 45 which has the internal thread part 45a in which the external thread part 61 of the fixed bolt 60 is screwed in is attached to the fixed frame 41 of the fixed part 40. The boss portion 45 protrudes upward from the fixed frame 41 and the boss portion 45 is attached to the fixed frame 41 by fixing the base portion 45 b of the boss portion 45 from above the fixed frame 41 with screws 44.

  A pedal pressing plate 46 is fixed to the tip of the fixing bolt 60 with a screw 46b. The pedal pressing plate 46 is provided with a recess 46c, and a pedal pressing rubber 46a is embedded in the recess 46c.

  The pedal fixing part 40 is composed of a pedal pressing plate 46 attached to a fixing frame 41 and a fixing bolt 60, and a pedal pressing part 62 is turned by turning a knob 62 of the fixing bolt 60 attached to a boss part 45 of the fixing frame 41. The plate 46 moves up and down. When the pedal pressing plate 46 is raised, that is, loosened, the knob 62 is turned counterclockwise. Further, when the pedal pressing plate 46 is lowered, that is, tightened, the knob 62 is turned to the right. By turning the knob 62 of the fixing bolt 60, the pedal of the piano is sandwiched and fixed by the pedal pressing plate 46 and the base rubber 14 provided on the base plate 10.

  The main pole 20 is provided with a lock hole 22 composed of an oblong hole or a square hole having a predetermined length in order to fix the slider portion 32a of the slide shaft 32 inserted into the insertion hole 21 at a predetermined height. It has been.

  As shown in FIG. 9 and FIG. 10, a receiving tray portion 23 having a spherical surface that gradually decreases downward is provided around the lock hole 22. The saucer portion 23 is formed so that the same spherical shape is deeply engraved as it goes upward and becomes shallower as it goes down, so that the saucer portion 23 becomes smaller as it goes down. In this embodiment, eight tray parts 23 are formed continuously downward to form a lock hole 22. The lock hole 22 is formed in a size that allows the threaded portion 51 of the lock bolt 50 to be inserted. In the lock hole 22, the eight tray parts 23 constitute eight height adjustment positions, similarly to the eight holes formed continuously.

  As shown in FIG. 10, the lock bolt 50 is provided with a convex portion 52 formed of a spherical surface up to the screw portion 51 between the shaft portion 53 provided on the knob portion 54 and the screw portion 51. The convex portion 52 is formed so that the diameter thereof becomes smaller toward the screw portion 51 when the cross section is taken in a direction orthogonal to the axis. The spherical surface of the convex portion 52 has the same diameter as the spherical surface of the saucer portion 23 of the lock hole 22. The closer to the screw portion 51, the closer to the catch portion 23 below the lock hole 22. Is engaged with the tray portion 23 of the.

  The slide shaft 32 is provided with two female screw portions 32c and 32d that engage with the screw portion 51 of the lock bolt 50 (see FIG. 6). In this embodiment, since there are eight tray parts 23 of the lock hole 22 of the main pole 20, the screw part 51 of the lock bolt 50 is replaced with the female screw parts 32 c and 32 d provided on the slide shaft 32, so that there are 16 stages. Height adjustment can be performed. In this embodiment, the interval between the two female screw portions 32c and 32d of the slide shaft 32 is 20 mm, and the height of adjustment that can be performed by moving the lock hole 22 is 50 mm.

  When the lock bolt 50 is attached to the female screw portion 32c on the slide shaft 32, the height can be adjusted between 130 mm and 180 mm, and when the lock bolt is attached to the lower female screw portion 32d, the height can be adjusted from 150 mm to 200 mm.

  When the slide shaft 32 to which the pedal portion 31 is attached is inserted from the insertion hole 21 of the main pole 20 so that the center of the pedal portion 31 is parallel to the base plate 10, the female screw portions 32 c and 32 d of the slide shaft 32 are locked into the lock hole 22. Then, the screw portion 51 of the lock bolt 50 is screwed into, for example, the upper female screw portion 32c of the female screw portions 32c and 32d of the slide shaft 32.

  1 to 7 show a state where the height of the performance pedal 30 is adjusted to the lowest position. When the threaded portion 51 of the lock bolt 50 is screwed into the female threaded portion 32c on the slide shaft 32, the slide shaft 32 is pushed down to the bottom and the knob 54 of the lock bolt 50 is turned, the lock bolt 50 is moved to the main pole 20. The convex portion 52 of the lock bolt 50 engages with the lowermost tray portion 23, and the slide shaft 32 is locked. At this time, the lock bolt 50 is locked at the shallowest position. And since the convex part 52 and the saucer part 23 are formed by the spherical surface of the same diameter, a strong fastening force is obtained with a wide contact area, and the performance pedal 30 is firmly fixed to a predetermined height. .

  12 and 13 show a state where the height of the performance pedal 30 is adjusted to the highest position when the screw portion 51 of the lock bolt 50 is screwed into the female screw portion 32c on the slide shaft 32. FIG. When the screw portion 51 of the lock bolt 50 is screwed into the female screw portion 32c on the slide shaft 32, the slide shaft 32 is lifted up to the top and the knob 54 of the lock bolt 50 is turned, the lock bolt 50 is moved to the main pole 20. The convex portion 52 of the lock bolt 50 engages with the uppermost tray portion 23, and the slide shaft 32 is locked. At this time, the lock bolt 50 is locked in the deepest position (see FIG. 11). And since the convex part 52 and the saucer part 23 are formed by the spherical surface of the same diameter, a strong fastening force is obtained with a wide contact area, and the performance pedal 30 is firmly fixed to a predetermined height. .

  In order to lower the height of the performance pedal 30 from this position, if the lock bolt 50 is slightly loosened, the convex portion 52 engages with the lower receiving tray 23 and the lock bolt 50 is tightened at this position. It can be adjusted to the height of the next lower position.

  As described above, the height can be easily adjusted simply by loosening the lock bolt 50 and moving the slide shaft 32 and tightening the lock bolt 50.

  FIG. 14 shows a state in which the height of the performance pedal 30 is adjusted to the highest position. When the threaded portion 51 of the lock bolt 50 is screwed into the female threaded portion 32d below the slide shaft 32, the slide shaft 32 is lifted up to the top of the main pole 20, and the knob 54 of the lock bolt 50 is turned. 50 advances toward the main pole 20, the convex portion 52 of the lock bolt 50 engages with the uppermost tray portion 23, and the slide shaft 32 is locked. At this time, the lock bolt 50 is locked at the deepest position.

  The lock bolt 50 is removed from the slide shaft 32 only when the position of the female thread portion of the lock bolt 50 attached to the slide shaft 32 is changed. That is, normal height adjustment can be performed by loosening the lock bolt 50, moving the slide shaft 32 to a predetermined height position, and fitting the convex portion 52 of the lock bolt 50 into the tray portion 23 of the lock hole 22. The height can be easily adjusted.

  Further, since the tray portion 23 around the lock hole 22 is gradually shallower as it goes downward, even if the lock bolt 50 is slightly loosened, it can be received by the next lower tray portion 23, so that a large pedal Can be prevented from falling.

  In this embodiment, the saucer portion 23 is formed as a spherical surface that gradually decreases downward, but a plurality of saucer portions 23 that are spherical surfaces having the same diameter may be provided. In this case, the engagement position between the convex portion 52 of the lock bolt 50 and the tray portion 23 is the distance from the same shaft portion 53. For this reason, it is necessary to loosen the lock bolt 50 and lower the slider shaft 32 to a predetermined position and then tighten the lock bolt 50 when adjusting the height to be shifted from the top to the bottom.

  Next, attachment of this embodiment to a piano pedal will be described with reference to FIGS. 15 and 16.

  Turn the fixing bolt 60 counterclockwise to raise the pedal holding plate 46 to the top. Then, the piano pedal 2 is inserted between the pedal pressing plate 46 and the base rubber 14 of the holding portion 11, and the fixing bolt 60 is lightly tightened. At this time, the pedal 2 is brought into contact with the wall 13a of the recess 13 of the holding portion 11 so that the attachment position can be determined. For this reason, it can attach shallowly and it can prevent that the auxiliary pedal apparatus 1 for pianos drops from the pedal 2. FIG.

  Subsequently, the piano auxiliary pedal device 1 is moved lightly to the left and right, adjusted and finely adjusted so that the performance pedal 30 is directed in a desired direction, and then the fixing bolt 60 is tightened to tighten the pedal pressing plate 46 and the holding portion 11. The pedal 2 is securely fixed between the base rubbers 14. Since the fixing bolt 60 is provided with a large circular knob 62 having irregularities around it, the auxiliary pedal device 1 for piano can be quickly attached.

  The height of the performance pedal 30 can be adjusted by loosening the lock bolt 50, moving the slide shaft 32 to a predetermined height position, and tightening the convex portion 52 of the lock bolt 50 into the tray portion 23 of the lock hole 22. . Thus, the height adjustment of the performance pedal 30 can be easily performed.

  Further, when the piano auxiliary pedal device 1 of this embodiment is attached to the piano pedal 2, as shown in FIG. 16, the performance pedal 30 is positioned further upward and later than the end of the piano pedal 2. By doing so, the pedal 2 of the piano can be easily depressed with a small force by the action of the lever.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims for patent.

1: Auxiliary pedal device for piano 2: Pedal pedal 10: Base plate 10a: Screw 11: Holding portion 12: Mounting portion 13: Recess 13a: Wall 14: Base rubber 14b: Nut 15: Step portion 20: Main pole 21: Insertion hole 22: Lock hole 23: Sampling part 24: Hole 30: Performance pedal 31: Pedal part 32: Slide shaft 32a: Slider part 32b: Pedal attachment part 32c: Female thread part 32d: Female thread part 32e: Engaging protrusion 32f : Screw hole 33: Groove 34: Screw 35: Engagement hole 40: Pedal fixing part 41: Fixing frame 42: Bending piece 45: Boss part 45a: Female thread part 45b: Base part 46: Pedal pressing plate 46a: Pedal pressing rubber 46b : Screw 46c: Concave part 50: Lock bolt 51: Screw part 52: Convex part spherical part 53: Shaft part 54: Knob Groove 60: Fixing bolt 60a: Knob 61: Male thread 62: Knob

Claims (7)

A main pole that supports the performance pedal at a predetermined height and a pedal fixing portion that fixes the piano pedal are attached to the base plate,
The performance pedal includes a pedal portion, a slide shaft attached to the pedal portion, and at least one female screw portion provided on the slide shaft,
The main pole has an insertion hole into which the slide shaft is inserted, a lock hole having a predetermined length above and below to support the slider shaft, and a plurality of trays provided around the lock hole. And
A lock bolt having a convex portion that engages with the tray portion and supports and fixes the slide shaft to the main pole is screwed into the female screw portion of the slide shaft, and the convex portion of the lock bolt is engaged with a predetermined tray portion. An auxiliary pedal device for a piano, wherein the slide shaft is supported and fixed by adjusting a height of the performance pedal.   2. The piano auxiliary pedal device according to claim 1, wherein the lock bolt is provided with the convex portion between a shaft portion and a screw portion provided in a knob portion.   The auxiliary pedal device for piano according to claim 1 or 2, wherein the tray portion has a spherical surface, and the convex portion is formed of a spherical body having the same diameter as the tray portion.   The auxiliary pedal device for a piano according to claim 3, wherein the tray portion is formed continuously with a tray portion that is a spherical surface that gradually decreases downward.   5. The auxiliary pedal device for a piano according to claim 4, wherein the tray portion is formed so that the same spherical shape is carved deeper toward the upper side and shallower toward the lower side.   The base plate includes a holding portion that accommodates and holds a piano pedal and an attachment portion to which the main pole is attached, and the bottom surface of the attachment portion is formed in a tapered shape so that the thickness thereof decreases toward the tip. The auxiliary pedal device for a piano according to claim 1.   The holding portion includes a fixed portion having a pedal pressing plate that is supported so as to be movable up and down, and a recess provided with a base rubber that sandwiches the pedal with the pedal pressing plate, and a distal end portion of the recess The piano auxiliary pedal device according to claim 6, further comprising a positioning wall for inserting a piano pedal into the piano.

Images