JP2010002848A - Key support device of piano - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a key support device of a piano by which lubricant application and frequent maintenance are not required, and sliding nature of a keyboard pin is maintained over a long period of time. <P>SOLUTION: The key support device 1 of the piano, including an engagement aperture 2e extending to a cross direction and opening to a bottom face, which supports a key 2 on which bushing cloth 7 is stuck to a wall face of the engaging aperture 2e so as to be freely rocked, comprises: a key frame 4 placed on a top face of a key bed 8; and a key board pin 10 provided on the key frame 4, on which the key 2 is engaged via the engagement aperture 2e, and in which the busing cloth 7 slides, when the key 2 is rocked according to key pressing. A coating layer 10a which includes a fluorinated carbon resin is formed on a surface of the keyboard pin 10. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a piano key support device for swingably supporting a key.

  As a conventional key support device for this kind of piano, for example, the one disclosed in Patent Document 1 is known. In this key support device, a balance pin is erected at the center of the heel in the front-rear direction, and a front pin is erected at the front end of the heel. A balance pin hole penetrating in the vertical direction is formed in the center of the key. By passing the balance pin hole through the balance pin, the key is supported by the bag so as to be swingable around the balance pin. Yes. Further, a front pin hole that opens to the lower surface is formed at the front end portion of the key, and when the front pin hole engages with the front pin, the lateral movement of the key is restricted. These balance pins and front pins are usually made of brass with nickel plating on the surface.

  Further, left and right bushing cloths made of artificial leather are attached to the left and right wall surfaces of the balance pin hole and the front pin hole of the key. When the key swings when the key is pressed, these bushing cloths are in sliding contact with the balance pin and the front pin, so that the smooth operation of the key is ensured and noise is prevented.

  However, if the key is pressed repeatedly due to long-term use of the piano, the front pin or the like is scratched or the bushing cloth is worn and seized due to friction between the key bushing cloth and the front pin or balance pin that slides on the key. As a result, the friction increases and the smooth movement of the keys is hindered, which may hinder the performance. In particular, in the case of the front pin, since it is arranged at a position far from the fulcrum of the key, the friction with the bushing cloth tends to increase, and the wear of the bushing cloth is likely to occur and such wear. Once such a problem occurs, the adverse effect on the operation of the key becomes noticeable. For this reason, in this conventional key support device, a lubricant such as silicone oil is applied to the bushing cloth and the front pin during manufacturing in order to maintain a good slipping property between the bushing cloth and the front pin for a long time, or Therefore, it is necessary to frequently perform maintenance for maintaining or recovering the slipperiness.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a piano key support device that can maintain the slidability of a keyboard pin for a long period of time without requiring application of a lubricant or frequent maintenance.

JP 2005-55651 A

  In order to achieve this object, the invention according to claim 1 swings a key having an engagement hole extending in the front-rear direction and opening in the lower surface, and a bushing cloth attached to the wall surface of the engagement hole. A key support device for a piano that is freely supported. The key support device is installed on the top surface of the shelf, and the key is engaged with the key through the engagement hole. And a keyboard pin on which the bushing cross slides, and a coating layer containing a fluororesin is formed on the surface of the keyboard pin.

  According to this configuration, the key engagement hole is engaged with the keyboard pin erected on the ridge, and the bushing attached to the engagement hole when the key swings as the key is depressed. The cloth slides along the keyboard pins.

  According to the present invention, since the coating layer containing the fluororesin is formed on the surface of the keyboard pin, it is possible to reduce the friction generated between the key bushing cloth and the keyboard pin. As a result, scratches on the keyboard pins and wear and seizure of the bushing cloth are less likely to occur, and as a result, the friction between the bushing cloth and the keyboard pins can be maintained in a small state for a long time. Thereby, the slipperiness of the keyboard pin can be maintained for a long period of time without requiring application of a lubricant or frequent maintenance.

  The invention according to claim 2 is the piano key support device according to claim 1, wherein the engagement hole is a front pin hole formed in the front end portion of the key, and the front pin hole is engaged with the keyboard pin. And a front pin for guiding the key so as not to move in the left-right direction.

  According to this configuration, the front pin hole formed in the front end portion of the key is engaged with the front pin as the keyboard pin, and the lateral movement of the key is restricted by the guide by the front pin. As described above, since the front pin is located far from the fulcrum of the key, the friction with the bushing cloth tends to increase, and the wear of the bushing cloth is likely to occur. The adverse effect on the key operation due to is prominent.

  According to the present invention, since the coating layer containing the fluororesin is formed on the surface of the front pin, it is possible to effectively obtain the operation of the first aspect described above.

  According to a third aspect of the present invention, in the piano key support device according to the first aspect, the surface of the portion embedded in the key pin ridge is provided with irregularities for increasing the holding force of the keyboard pin. Features.

  According to this structure, the unevenness is formed on the surface of the portion embedded in the key pin ridge, and the holding force of the keyboard pin is enhanced by the unevenness. Therefore, the decrease in the holding force of the keyboard pin in which the coating layer is formed on the keyboard pin can be compensated by the holding force due to the unevenness. As a result, the holding force of the keyboard pin is maintained, so that the keyboard pin can be prevented from wobbling or coming off from the bag.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 partially shows a keyboard of a grand piano according to an embodiment of the present invention. As shown in the figure, the keyboard includes a plurality of keys 1 (a white key 2 and a black key 3, each of which is shown only one), a key 4 that supports these keys 1, and the like. In the following description, the front side of the piano when viewed from the performer side is described as “front”, and the back side is described as “rear”.

  The white key 2 includes a key main body 2a extending in the front-rear direction, a white key cover 2b attached from the upper surface of the front portion to the front surface, and the like. The white key cover 2b is composed of a synthetic resin thin plate having an L-shaped side surface. The key body 2a is made of, for example, a wood material such as spruce, has a rectangular cross section, and the width of the front end portion is wider than the rear portion thereof. A center plate 5 is affixed to the center of the upper surface of the key body 2a.

  In the center of the white key 2, a balance pin hole 2 d penetrating in the vertical direction is formed from the key body 2 a to the middle seat plate 5. As shown in FIG. 2, the balance pin hole 2 d has a lower end portion formed of a round hole, and an upper portion thereof extends to both the front and rear sides of the lower end portion. A pair of left and right bushing cloths 6 and 6 are attached to the balance pin hole 2d from the left and right wall surfaces to the upper surface of the center seat plate 5. These bushing cloths 6 and 6 are made of wool cloth.

  As shown in FIG. 3, a front pin hole 2e is formed in the lower surface of the front end portion of the key body 2a. The front pin hole 2e opens in the lower surface of the key body 2a, extends to the vicinity of the upper surface of the key body 2a, and extends in the front-rear direction. Also, a pair of left and right bushing cloths 7, 7 are attached to the front pin hole 2e from the left and right wall surfaces to the lower surface of the key body 2a. These bushing cloths 7, 7 are also made of wool cloth.

  The black key 3 includes a key body 3a shorter than the key body 2a of the white key 2, a black key cover 3b attached to the front portion, and the like. Since the white key 2 and the black key 3 have substantially the same configuration, the description of the same configuration is omitted.

  The saddle 4 is placed on the shelf board 8 and is composed of a front 4a, a middle 4b, and a rear 4c spaced apart from each other in order from the front side, and these extend in the left-right direction. .

  A large number of balance pins 9 are erected for each of the white key 2 and the black key 3 in the center 4b. The balance pin 9 is made of brass, for example, and the surface thereof is plated with nickel, and is attached to the center 4b by driving. Further, a ring-shaped balance punching cloth 12 is passed through the balance pin 9, and this balance punching cloth 12 is placed on the center 4b.

  The white key 2 is engaged with the balance pin 9 through the balance pin hole 2d, and is thereby supported by the center pin 4b so as to be swingable around the balance pin 9.

  A large number of front pins 10 are erected on the front 4 a for each of the white key 2 and the black key 3. As shown in FIG. 4, the base end portion of the front pin 10 is a knurled portion 10b whose surface is knurled. The front pin 10 is attached to the front 4a by driving this knurled portion 10b into the front 4a.

  The front pin 10 is made of brass, for example, and as shown in FIG. 5, a coating layer 10a is formed on the surface thereof. The coating layer 10a is made of nickel containing a fluororesin such as PTFE (polytetrafluoroethylene (tetrafluoride)), and thus has a hard surface and excellent slipperiness and wear resistance. . The coating layer 10a is formed, for example, by immersing the entire front pin 10 having the knurled portion 10b in a nickel plating solution to which a predetermined amount of fluororesin is added.

  Further, a ring-shaped front punching cloth 11 is passed through the front pin 10, and this front punching cloth 11 is placed on the front 4a.

  The white key 2 is engaged with the front pin 10 having the above-described configuration via the front pin hole 2e, whereby the lateral movement of the white key 2 is restricted by the guidance of the front pin 10.

  A keyboard pillow 13 made of cloth or the like is attached to the upper surface of the back 4c. In the key release state, the rear end of the key body 2a is seated on the keyboard pillow 13.

  With the above configuration, when the white key 2 is pressed, the white key 2 swings about the balance pin 9. When the white key 2 swings, the bushing cloth 6 provided in the balance pin hole 2d slides along the balance pin 9, and the bushing cloth 7 provided in the front pin hole 2e is attached to the front pin 10. Slide along.

  According to the present embodiment, since the coating layer 10a containing a fluororesin is formed on the front pin 10, friction generated between the bushing cloth 7 and the front pin 10 can be reduced. As a result, the front pin 10 is hardly damaged, and the bushing cloth 7 is hardly worn and seized. As a result, the friction between the bushing cloth 7 and the front pin 10 can be maintained in a small state for a long time. Thereby, the slipperiness of the front pin 10 can be maintained for a long period of time without requiring application of a lubricant or frequent maintenance.

  Moreover, since the front pin 10 is attached to the front 4a by driving the knurled part 10b into the front 4a, the holding power of the front pin 10 is enhanced by the knurled part 10b. Therefore, the decrease in the holding force of the front pin 10 due to the coating layer 10a containing the fluororesin being formed on the front pin 10 can be compensated by the holding force by the knurled portion 10b. As a result, by maintaining the holding force of the front pin 10, it is possible to prevent the front pin 10 from wobbling or coming off from the front 4a.

  In addition, this invention can be implemented in various aspects, without being limited to the embodiment described above. For example, the coating layer 10 a according to the embodiment may be formed on the surface of the balance pin 9 so as to reduce the friction generated between the bushing cloth 6 and the balance pin 9. In the embodiment, the unevenness on the surface of the front pin 10 is formed by knurling, but it goes without saying that other forming methods may be adopted. In addition, it is possible to appropriately change the detailed configuration within the scope of the gist of the present invention.

It is a perspective view which shows the key support apparatus of the piano of this invention. It is the BB sectional view taken on the line of FIG. It is the sectional view on the AA line of FIG. It is a front view of a front pin. It is CC sectional view taken on the line of FIG.

Explanation of symbols

1 key (key support device)
2 White key (key)
2d, 3c Balance pin hole (engagement hole)
2e Front pin hole (engagement hole)
3 Black key
4 筬 6, 7 Bushing cross 8 Shelf 9 Balance pin (keyboard pin)
10 Front pin (keyboard pin)
10a Coating layer 10b Knurled part (unevenness)

Claims (3)

A piano key support device that has an engagement hole that extends in the front-rear direction and opens on the lower surface, and supports a key having a bushing cross attached to the wall surface of the engagement hole in a swingable manner.
A bowl placed on the top surface of the shelf,
A keyboard pin that is erected on the hook and that engages the key through the engagement hole, and that the bushing cross slides when the key swings as the key is pressed;
A piano key support device, wherein a coating layer containing a fluororesin is formed on a surface of the keyboard pin. The engagement hole is a front pin hole formed at the front end of the key,
2. The piano key support device according to claim 1, wherein the keyboard pin is a front pin for guiding the key so that the front pin hole is engaged and the key is not moved in the left-right direction.   2. The piano key support device according to claim 1, wherein unevenness for increasing the holding force of the keyboard pin is formed on a surface of a portion of the keyboard pin embedded in the bag.

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