JP2010217626A - Sostenuto device of upright piano - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problem: attempts to make an upright piano include a sostenuto device are performed conventionally but all of them cause uncomfortable feeling in a hand under performance. <P>SOLUTION: The sostenuto device includes a rigid bracket 25 that is attached to a damper lever 7 and projects below its lower end, a fin 49 having spring properties projecting below the lower end, a sostenuto rod 63 turned by a treading operation of a sostenuto pedal, and a locking projection 65 that projects outward from its outer peripheral surface and comes from and goes to a moving route of the fin 49 by turning of the sostenuto rod 63. The sostenuto device meets the request of weight reduction and rigidity increase, does not disturb the turning operation of the damper lever 7 corresponding to another key during work, and does not cause uncomfortable feeling in the hand under performance. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sostenuto device for an upright piano.

A grand piano is usually provided with a sostenuto device that keeps a specific key sounding long by depressing the sostenuto pedal. By providing this sostenuto device, it is possible to play the next key and produce the performance sound while maintaining the sound of a certain key, and to obtain an advantageous effect on the performance technique.
Some upright pianos are also provided with a sostenuto device as described in Japanese Patent Application Laid-Open No. H11-228707.

Japanese Unexamined Patent Publication No. 63-40196

However, any of the upright pianos equipped with the sostenuto device affects the damper mechanism, which causes a sense of incongruity during the performance.
Therefore, regarding the upright piano, the sostenuto device has not been actively used yet.

  In order to solve the above-described problems, an object of the present invention is to provide a sostenuto device for an upright piano that is devised so as not to cause a sense of incongruity in the hands during performance.

  The present invention has been made to solve the above-mentioned problems, and the invention of claim 1 is a sostenuto device for an upright piano provided with a damper mechanism for rotating a damper lever away from a string by a key pressing operation. A rigid bracket that is attached to the damper lever and projects downward from the lower end of the damper lever, a spring-like fin that is attached to the bracket and projects downward from the lower end of the bracket, and a sostenuto pedal depressing operation A sostenuto rod that is rotated by the rotation and a locking projection that protrudes outward from the outer peripheral surface of the sostenuto rod and enters and exits the movement path of the fin by the rotation of the sostenuto rod. .

  A second aspect of the present invention is the sostenuto apparatus for an upright piano according to the first aspect, wherein the bracket is formed of an angle member having a horizontal portion.

  According to a third aspect of the present invention, in the sostenuto device for an upright piano according to the second aspect, the fin is also formed of an angle member having a horizontal portion, and the horizontal portion of the fin is applied to the horizontal portion of the bracket from above. Sostenuto device characterized by being installed.

  A fourth aspect of the present invention is the sostenuto apparatus for an upright piano according to any one of the first to third aspects, wherein the lower part of the bracket is tapered.

  The invention of claim 5 is the sostenuto apparatus for an upright piano according to any one of claims 1 to 4, characterized in that a through hole is formed in the bracket.

  The invention according to claim 6 is the three-dimensional non-woven fabric in which the microfiber is entangled with the fin portion that is brought into contact with and locked to the locking projection of the sostenuto rod in the upright piano sostenuto device according to any one of claims 1 to 5 Is a sostenuto device characterized by being attached.

  According to the sostenuto device for an upright piano of the present invention, a sense of incongruity is not generated in the hands during performance.

It is a perspective view which shows the damper mechanism and sostenuto apparatus of an upright piano which concern on embodiment of this invention. FIG. 2 is an exploded perspective view of FIG. 1. It is the side view and front view of the bracket of FIG. FIG. 2 is a side view for comparing and explaining state changes before and during operation of the sostenuto device of FIG. 1. It is a perspective view explaining a state when another key is pushed down and the damper mechanism is operated during the operation of the sostenuto device of FIG. It is a perspective view of the bracket of another example. It is the side view and front view of a bracket of FIG.

An upright piano sostenuto apparatus according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows the main parts related to the damper mechanism and the sostenuto device of the upright piano 1. The damper mechanism of the upright piano 1 is well known, and a damper lever 7 is rotatably supported by a pin 9 toward a string 11 with respect to a support member 5 attached to the damper lever rail 3. A damper wire 13 extends upward from the upper end portion of the damper lever 7, and a damper block 17 integrated with the damper head 15 is attached to the tip of the damper wire 13. A damper felt 19 is provided on the damper head 15 on the side in contact with the string 11. Further, a damper lever spring 21 having both ends fixed to the damper lever 7 and the support member 5 is provided, and the damper lever spring 21 causes the damper lever 7 to contact the string 11 with the damper felt 19 of the damper head 15. It is energized. Although not shown, a stop rail is provided opposite to the damper lever 7.

The upright piano 1 having the damper mechanism configured as described above is provided with a sostenuto apparatus having the following configuration.
The lower surface of the damper lever 7 located below the support member 5 has a flat stepped portion 23 formed by cutting away the surface not facing the chord 11.

Reference numeral 25 denotes a bracket, and the bracket 25 is formed of an angle material having a substantially Z-shaped cross section obtained by bending a lower portion of a vertically long rectangular plate material twice at a substantially right angle. The bracket 25 is made of a rigid steel material.
As shown in FIG. 3, the bracket 25 is divided into three parts in the vertical direction, and the upper part 27 and the intermediate part 29 are parts having a substantially I-shaped cross section. The upper portion 27 and the intermediate portion 29 are slightly bent at the boundary, and when viewed from the side view of FIG. 3, the boundary portion 28 has a mountain shape that protrudes rightward. The lower portion 31 has a substantially L-shaped cross section, but the vertically extending portion is slightly raised in the upper right direction, and the bending angle is slightly larger than 90 °.
Further, as shown in the front view of FIG. 3, the width gradually decreases from the lower end side of the upper portion 27 of the bracket 25 toward the lower end of the lower portion 31.

  The bracket 25 has an upper portion 27 applied to the above-described stepped portion 23 in a state where the lower portion 31 bent in an L-shape protrudes to the opposite side of the string 11, and the bolt 33, A bolt 33 of a bolt / nut fastening means constituted by a nut 35 is inserted into a bracket side insertion hole 37 and a damper lever side insertion hole 39 formed in advance from the bracket 25 side, and is fastened and fixed. The plate thickness dimension of the bracket 25 is substantially the same as the recess dimension of the step portion 23, and almost no step is formed between the bracket 25 entering the step portion 23 and the damper lever 7.

  Reference numeral 41 denotes a lever felt. The lever felt 41 has a band shape, and the width dimension is substantially the same as the width dimension of the bracket 25. The lever felt 41 covers the lower part of the damper lever 7 and the upper part 27 of the bracket 25. On the lever felt 41, a square rod felt 43 and a spoon felt 45 are further arranged vertically.

Reference numeral 47 denotes a bracket skin. The bracket skin 47 has a belt-like shape, and the dimension in the width direction is substantially the same as the dimension in the width direction of the bracket 25. As the bracket skin 47, a product (manufactured by Toray Industries, Inc.) sold under “Registered Trademark: EXEN” is used among three-dimensional nonwoven fabrics in which microfibers are intertwined. This product is an artificial leather with a structure similar to natural suede. This product is more resistant to wear than felt.
The bracket skin 47 covers most of the front side (the side seen in the front view of FIG. 3) of the lower portion 31 of the bracket 25, and then is folded back to the back side at the lower end.

Reference numeral 49 denotes a fin, and the fin 49 is formed of a strip-shaped leaf spring material. The width dimension of the fin 49 is slightly smaller than the width dimension of the bracket 25. The fins 49 are bent in the middle to form an L-shaped angle member, and the long portion is arranged so as to face the vertical direction. In addition, the long part extended up and down slightly lifts in the upper right direction, and the bending angle is slightly larger than 90 °. Therefore, the bending angle of the bent portion of the fin 49 is substantially the same as the bending angle of the lower portion 31 of the bracket 25. Moreover, the long part is gradually narrowed toward the lower end.
Reference numeral 51 denotes a fin skin. The fin skin 51 has a band shape, and the widthwise dimension thereof is substantially the same as the widthwise dimension of the fin 49. The same product as the bracket skin 47 is used as the fin skin 51.
The fin skin 51 covers the lower part of the front side of the fin 49 and then is folded back to the back side at the lower end. The back side is also covered by the same length as the front side.

The horizontal part of the L-shaped fin 49 is applied to the horizontal part of the L-shaped lower part 31 of the bracket 25 from the upper side, and the upper and lower parts are overlapped with each other so that the bent parts are opposed to each other. Further, the fin 49 extends downward beyond the bracket 25, and the portion of the fin 49 covered with the skin 51 extends just downward.
With respect to the bracket 25, the fin 49 includes a bolt-side through hole 59 in which a bolt 53 of a bolt / nut fastening means including a bolt 53, a nut 55, and a washer 57 is formed in a horizontal portion in advance from the fin 49 side and the bracket side. It is inserted through the insertion hole 61 and fastened and fixed.

Reference numeral 63 denotes a cylindrical sostenuto rod, and the sostenuto rod 63 is arranged to extend across the damper mechanism for all the strings 11. The sostenuto rod 63 is rotated counterclockwise as indicated by an arrow in FIG. 1 or the like by a depression operation of a sostenuto pedal (not shown).
A locking projection 65 is integrally formed on the outer peripheral surface of the sostenuto rod 63. The locking protrusion 65 extends to near both ends of the sostenuto rod 63 and has the same cross-sectional shape. When the sostenuto rod 63 is rotated by the depression operation of the sostenuto pedal, the locking projection 65 stands up on the sostenuto rod 63. At this time, the left surface is a substantially flat surface 67, and the right surface is Is a curved surface 69 bulging outward.
The sostenuto rod 63 is close to the fin 49 positioned above, and the locking projection 65 can enter and exit the movement path of the fin 49 by the rotation of the sostenuto rod 63.

Next, the state change before and during operation of the sostenuto device provided in the upright piano 1 will be described with reference to FIG.
When a key is depressed during performance, a damper spoon (not shown) comes into contact with the spoon felt 45, and the damper lever 7 rotates clockwise against the biasing force of the damper lever spring 21. The damper felt 19 moves away from the string 11. At the same time, the string 11 is struck by a hammer (not shown) of the string-striking mechanism to produce a sound. After that, when the key is released and returned, the damper lever 7 returns to the initial state by the urging force of the damper lever spring 21, so that the damper felt 19 of the damper head 15 abuts against the string 11 and the string 11 corresponding to the key 11 Suppresses vibration and stops sound.

However, when it is desired to continue the sounding of the key, the key is depressed as in the conventional case, and the sostenuto pedal is depressed while maintaining the state as it is. Then, the sostenuto device is actuated, and the sostenuto rod 63 is rotated counterclockwise as indicated by the arrow, so that the locking projection 65 is in the above-mentioned standing posture, and the standing posture is maintained during the depression. In the standing posture, the locking projection 65 is in the movement path of the fin 49. Therefore, even if the key is released and returned, the fin 49 integrally attached to the damper lever 7 of the key is locked by contacting the substantially flat surface 67 of the locking protrusion 65, so that the damper mechanism works. Instead, the string 11 corresponding to the key is left open. Therefore, the sound of the string 11 corresponding to the key continues. Note that the key can be depressed again to make it sound again.
When the operation of depressing the sostenuto pedal is released, the operation of the sostenuto device is released, the sostenuto rod 63 rotates clockwise, and the locking projection 65 comes out of the movement path of the fin 49 and returns to the standby position. Therefore, the damper mechanism again works for the damper lever 7 corresponding to the key.

The state when the damper mechanism is operated by pressing another key while the sostenuto device is operating will be described with reference to FIG.
When another key is depressed while the sostenuto device is in operation, the fin 49 integrally attached to the damper lever 7 corresponding to the key abuts against the curved surface 69 of the locking projection 65 and is elastic. Can escape. Therefore, the damper lever 7 itself corresponding to the key is sufficiently rotated clockwise, and the damper mechanism can be operated for the key.

According to the above-described sostenuto device, the intermediate portion 29 and the lower portion 31 of the bracket 25 are tapered downward, so that the weight can be reduced. Further, since the bracket 25 is made of an angle material obtained by bending a flat plate material, the distance from the pin 9 is shorter than when the plate material is directly attached to the damper lever 7. Therefore, the moment of inertia is small, and when the damper lever 7 is rotated, the damper lever 7 does not dance with the flutter. Therefore, there is no sense of incongruity in the hands being played.
In addition, the bracket 25 is made of a rigid material having a sufficient size, and is made of an angle material that can be bent and expected to be hardened by work. Does not occur.

  Further, during operation of the sostenuto device, when another key is pressed down, the spring-like fin 49 attached to the damper lever 7 corresponding to the key comes into contact with the curved surface 69 of the locking projection 65 and is elastic. The key-pressing operation does not become heavy. The fin 49 is made of an angle material and extends long from the portion fixed to the bracket 25, so that a spring property having an appropriate strength that is neither too strong nor too weak can be stably obtained.

  6 and 7 show another example of the bracket 71. The bracket 71 is the same as the bracket 25 except that a plurality of through holes 73 are formed in the vertical direction. By forming the through hole 73 in this way, the weight can be further reduced.

The embodiment of the present invention has been described in detail above. However, the specific configuration is not limited to this embodiment, and the present invention can be changed even if there is a design change without departing from the gist of the present invention. included.
For example, although the nut is used in the above embodiment, the weight may be further reduced by changing the bracket so as not to use the nut by cutting the thread.
In the above-described embodiment, the damper lever is attached to the damper lever rail, but may be attached to the center rail.

  The upright piano equipped with the sostenuto device of the present invention can withstand practical performance even when the sostenuto device is operated.

DESCRIPTION OF SYMBOLS 1 ... Upright piano 3 ... Damper lever rail 5 ... Support member 7 ... Damper lever 9 ... Pin 11 ... String 13 ... Damper wire 15 ... Damper head 17 ... Damper block 19 ... Damper felt 21 ... Damper lever spring 23 ... Step part 25 ... Bracket 27 ... Upper part 28 ... Boundary part 29 ... Middle part 31 ... Lower part 33 ... Bolt 35 ... Nuts 37 ... Bracket side insertion hole 39 ... Damper lever side insertion hole 41 ... Lever felt 43 ... Rod felt 45 ... Spoon felt 47 ... Bracket skin 49 ... Fin 51 ... Fin skin 53 ... Bolt 55 ... Nut 57 ... Washer 59 ... Fin side insertion hole 61 ... Bracket insertion hole 63 ... Sostenuto rod 65 ... Locking protrusion 67 ... Substantially flat surface 69 ... Curved surface 71 Bracket (another example) 7 ‥ through hole

Claims (6)

In a sostenuto device for an upright piano provided with a damper mechanism that rotates a damper lever away from a string by a key pressing operation,
A rigid bracket that is attached to the damper lever and protrudes downward from the lower end of the damper lever, a spring-like fin that is attached to the bracket and protrudes downward from the lower end of the bracket, and is operated by depressing the sostenuto pedal. A sostenuto device comprising: a moving sostenuto rod; and a locking projection protruding outward from an outer peripheral surface of the sostenuto rod and entering and exiting the fin movement path by the rotation of the sostenuto rod. In the upright piano sostenuto device according to claim 1,
The sostenuto device, wherein the bracket is made of an angle member having a horizontal portion. In the upright piano sostenuto device according to claim 2,
The sostenuto device is characterized in that the fin is also made of an angle member having a horizontal portion, and the horizontal portion of the fin is attached to the horizontal portion of the bracket from above. In the upright piano sostenuto device according to any one of claims 1 to 3,
A sostenuto device characterized in that the lower part of the bracket is tapered. In the upright piano sostenuto device according to any one of claims 1 to 4,
A sostenuto device in which a through hole is formed in the bracket. In the upright piano sostenuto device according to any one of claims 1 to 5,
A sostenuto device characterized in that a three-dimensional nonwoven fabric in which microfibers are entangled with a fin portion that is brought into contact with and locked to a locking projection of a sostenuto rod.

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