JPH09258722A - Piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piano in which smooth sliding of a guide bar to a key bed can be maintained and the key bed of high rigidity can be manufactured easily. SOLUTION: In a piano 1, a guide bar 3 is slidably placed on a sliding face 22 of a steel key bed 2, and the sliding face 22 is coated with polytetrafluoroethylene 23, high in durability and low in frictional resistance, by sintering. The respective sliding faces 32c, 31b, 33b of a guide bar sliding fitting 32, a guide bar front part 31 and a guide bar rear part 33 are coated with polytetrafluoroethylene 32d, 31c, 33c by sintering.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piano, and more particularly to a reed provided with a keyboard and an action in a grand piano and the like, and a shelf board on which the reed is slidably mounted.

[0002]

2. Description of the Related Art Conventionally, a grand piano, a grand piano-type sound-deadening piano, etc. (hereinafter referred to as a piano) has a wooden shelf board and a wooden reed board placed on the shelf board. Mounted on the top are numerous keys and actions. The reed is slidable left and right when the soft pedal is operated, and can be slid back and forth when adjusting and repairing. In order to ensure smooth sliding of the reed, the bottom of the reed is formed so as to gently curve upward, and the reeds provided at the front of the reed and the middle of the reed with respect to the shelf plate surface. The sliding metal fittings and the rear part of the reed are in sliding contact with each other.

[0003]

However, according to the above-mentioned prior art, the shelves are made of wood, and the reed front part and the back of the reeds that slide on the shelves are also made of wood, so that the reeds slide smoothly. In order to do so, it is necessary to perform a leveling process on the surface of the shelf plate at the time of manufacturing, which is a problem that it takes time and labor. Even if the surface of the shelves is subjected to this smoothing process, the smoothness and flatness are likely to deteriorate due to aging, etc., so that the reeds may not slide smoothly. Furthermore, since the reed, action, and keyboard are heavy, it is easy for the shelf board to bend or distort, and as a measure to prevent this, it is necessary to add a reinforcing material to the shelf board, and it is troublesome to manufacture the shelf board. There was a problem of this.

The present invention has been made to solve the above problems, and provides a piano capable of sustaining smooth sliding of a reed on a shelf board and easily manufacturing a shelf board having high rigidity. The purpose is to

[0005]

According to the piano of claim 1, a shelf board made of metal and a reed slidably mounted on the sliding surface of the shelf board are provided. The sliding surface is coated with a synthetic resin with low frictional resistance.

As described above, since the shelf plate is made of metal and the sliding surface of the shelf plate is coated with the synthetic resin having a small frictional resistance, even if the reed slides on the sliding surface of the shelf plate. The smoothness of the sliding surface of the shelf plate does not deteriorate due to abrasion, and smooth sliding can be maintained. Similarly, since the shelf plate is made of metal, the rigidity is increased, and the flatness of the sliding surface of the shelf plate does not decrease due to aging, etc., and smooth sliding can be maintained. Further, since it is made of metal, the shelf plate can be easily processed and manufactured.

[0007] In the above, it is more preferable that the reed has a reed sliding metal fitting having a synthetic resin having a small frictional resistance coated in the middle of the reed, and the reed sliding metal fitting slides on the sliding surface of the shelf plate.

With this configuration, when the reeds slide on the sliding surface of the shelf plate, the frictional resistance between them becomes small. For this reason, the smoothness of the sliding surface of the shelf plate and the reed sliding fittings does not deteriorate due to abrasion, and smooth sliding can be maintained.

Further, in the above, the reed includes a reed front portion and a reed rear portion each having a metal plate coated with a synthetic resin having a small frictional resistance, and the reed front portion and the reed rear portion are provided on the sliding surface of the shelf plate. It is more preferable to slide.

With this configuration, when the reeds slide on the shelf, mutual frictional resistance is reduced. Therefore, the smoothness of the sliding surface of the shelf plate and the front and rear portions of the reed does not deteriorate due to abrasion, and smooth sliding can be maintained.

Further, in the above, on the sliding surface of the shelf plate,
More preferably, polytetrafluoroethylene is coated by sintering.

With this configuration, the durability of the coating on the sliding surface on the shelf side is increased, so that when the reed slides on the sliding surface of the shelf board, the sliding surface of the shelf board slides due to abrasion. Smooth sliding can be maintained without lowering the smoothness.

In addition, in the above, it is more preferable that the sliding surfaces of the reed sliding metal fittings, the reed front portion, and the reed rear portion are covered with polytetrafluoroethylene by sinter molding.

By doing so, the durability of the coating on the sliding surface on the reed side becomes high, so that when the reed slides on the sliding surface of the shelf board, the sliding surface of the shelf board and the reed board due to abrasion. Smooth sliding can be maintained without deterioration of the smoothness of the side sliding surface.

Further, in the above, it is more preferable that the shelf plate is formed by combining hollow rectangular steel members having a rectangular cross section in a lattice shape.

According to this structure, the hollow square bar is lightweight and has high rigidity, and since it is formed by combining these in a lattice shape, the shelf board can be made lightweight and high in rigidity. Further, since the hollow square bar is made of steel, it is easy to process, and it is a general material and easily available. Therefore, the shelf board can be easily manufactured.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
A piano according to an embodiment of the present invention will be described. FIG. 1 shows a schematic cross-sectional structure of the piano 1 viewed from the side. In the figure, a reed 3 is slidably placed on an upper surface 21 of a shelf 2 built in a piano 1.
A well-known keyboard 4 and action (string striking mechanism) 5 are placed on the top of
Is provided.

As shown in FIGS. 1 and 3, the shelf plate 2 is formed in a lattice shape by combining hollow rectangular steel members 20 having a rectangular cross section by welding, screwing or the like. This steel hollow square bar 20 is lightweight and highly rigid because it has a rectangular cross section, and since it is combined in a grid pattern, the shelf board 2
Is also highly rigid and lightweight. Therefore, the upper surface 21 of the shelf board 2
In addition, even if the heavy reed 3 provided with the keyboard 4 and the action 5 is placed, it does not bend or distort as compared with a wooden one. Further, since the hollow steel square bar 20 is a general material that is easy to process and is a general material, the shelf board 2 can be easily manufactured.

Further, on the upper surface 21 of the shelf board 2, polytetrafluoroethylene (hereinafter referred to as PTFE) 23 is formed on the surface 22 of the hatched portion in FIG. 3 by sintering.
Is coated. This surface 22 is reed 3 as will be described later.
It becomes a sliding surface when sliding on the shelf board 2.
The PTFE 23 coated on 2 has a very low frictional resistance and is also excellent in durability (heat resistance, chemical resistance, impact resistance). Therefore, since the shelf board 2 has high rigidity as described above, and the friction resistance of the PTFE 23 is very small, and the durability is excellent, even if the reed 3 slides on the sliding surface 22, it is worn. As a result, smoothness of the sliding surface 22 does not deteriorate, and smooth sliding can be maintained. Similarly, the smoothness can be maintained without the flatness of the sliding surface 22 lowering due to aging or the like.

The reed 3 is formed so that it can slide left and right on the sliding surface 22 of the shelf 2 when a soft pedal (not shown) is operated, and can slide back and forth during adjustment and repair.
As shown in FIGS. 1 and 2, the bottom surface portion 30 of the reed 3 is formed so as to be gently curved upward by cutting or the like, and when sliding on the sliding surface 22, the reed front portion 31, The reed sliding metal fitting 32 and the reed rear portion 33 are in sliding contact with each other.

The reed front portion 31 and the reed rear portion 33 are each a metal plate (steel plate) 31a fixed to a wooden reed main body 34,
33a, and the sliding surfaces 31b and 33b that slide on the sliding surface 22 of the shelf board 2 have PTFE 31c and
33c is covered. Further, in the reed sliding member 32 provided in the reed central portion 35, the screw portion 32 a is provided in the reed central portion 35.
It is provided so that the degree of protrusion of the protrusion 32 b with respect to the bottom portion 30 can be adjusted by a driver operation from above in the drawing. This protrusion 32b
The slide surface 32c with the slide surface 22 of the shelf board 2 on the PTFE
32d is covered. Also, the reed sliding metal fitting 32 is
In FIG. 3, it is normally located on the sliding surface 22 of the shelf plate 2 at the location indicated by the chain line circle.

In this way, each sliding surface 31b, 32c, 3
3b, PTF with high durability and low frictional resistance
Since E31c, 32d, and 33c are coated, and the sliding surface 22 of the shelf board 2 is coated with PTFE 23, even if the reed 3 slides on the sliding surface 22, the shelf board side Sliding surface 22 and sliding surface 31b, 32c, 3 on the reed side
Since the smoothness of 3b does not decrease, smooth sliding can be maintained.

In the piano 1 configured as described above, when a soft pedal (not shown) is stepped on, the reed 3 slides on the sliding surface 22 of the shelf board 2 on the sliding surfaces 31b, 32c, respectively.
While slidingly contacting at 33b, it slides to the right in FIG. 3 by a predetermined amount. At this time, each sliding surface 22, 31b, 32c, 33b
In the PTFE23, 31c, 32d, 33c, respectively.
Since it is covered, it slides smoothly. Next, when the foot is separated from the soft pedal, the reed 3 slides leftward in FIG. 3 and returns to its original position. At this time, the reed sliding member 32 returns to the position shown by the chain line circle in FIG.

When pulling out the reed 3 from the inside of the piano 1 for repair or the like, if the reed 3 is pulled downward (to the right in FIG. 1), the reed 3 slides on the shelf 2 in the same manner as above. The sliding surface 31b, 32c, 33b slidably contacts the surface 22 while sliding smoothly in the downward direction. Even when the reed 3 is returned to the piano 1 after the repair is completed, similarly, the upper direction of FIG. 3 (left direction of FIG. 1)
The reed 3 can be smoothly slid and returned to the original position shown in FIG.

As described above, according to the piano 1 of this embodiment, since the shelf board 2 is formed in a grid shape by combining the steel hollow square members 20 having a rectangular cross-sectional shape, the shelf board 2 is light and lightweight. High rigidity. Further, since the sliding surface 22 of the highly rigid shelf board 2 is covered with the PTFE 23 having high durability and small frictional resistance, the heavy reed 3 provided with the keyboard 4 and the action 5 on the sliding surface 22. Even if is slid, the smoothness of the sliding surface 22 does not deteriorate due to wear, and smooth sliding can be maintained. Similarly, the smoothness can be maintained without the flatness of the sliding surface 22 lowering due to aging or the like. Furthermore, the sliding surfaces 31b, 3 of the reed 3
2c and 33b are also covered with PTFE 31c, 32d and 33c, which have high durability and low frictional resistance, so that even if the reed 3 slides on the sliding surface 22, it will slide on the shelf side due to abrasion. The surface 22 and the reed-side sliding surfaces 31b, 32c,
Since the smoothness of 33b does not deteriorate, smooth sliding can be maintained.

In the above embodiment, the shelf plate 2 is formed by combining the hollow square members made of steel having a rectangular cross-section into a lattice shape. However, if the reed 3 does not bend or distort, the shelf 2 The plate 2 may be formed in any shape and may be formed of any metal. Further, the synthetic resin to be coated is not limited to PTFE, and any synthetic resin having high durability and low frictional resistance may be used.

[0027]

As described above, according to the piano of the present invention, since the shelf plate is made of metal and the sliding surface of the shelf plate is coated with the synthetic resin having a small frictional resistance, the sliding surface of the shelf plate is Even if the reed slides on the top, the smoothness of the sliding surface of the shelf plate does not deteriorate due to abrasion, and smooth sliding can be maintained. Similarly, since the shelf plate is made of metal, the rigidity is increased and the flatness of the sliding surface of the shelf plate is not deteriorated due to secular change or the like, and smooth sliding can be maintained. Further, since it is made of metal, the shelf plate can be easily processed and manufactured.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a piano according to an embodiment of the present invention as seen from a side surface.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a plan view of a shelf plate in the piano of the present invention.

[Explanation of symbols]

 1 Piano 2 Shelf 20 Steel Hollow Square 22 Shelf Sliding Surface 23 Synthetic Resin, Polytetrafluoroethylene 3 Reed 31 Reed Front 31a Metal Plate 31b Reed Sliding Surface 31c Synthetic Resin, Polytetrafluoroethylene 32 Reed sliding fittings 32c Reed sliding surface of sliding fittings 32d Synthetic resin, polytetrafluoroethylene 33 Reed rear part 33a Metal plate 33b Rear sliding surface of reed 33c Synthetic resin, polytetrafluoroethylene 35 Reed middle part

Claims (6)

[Claims] 1. A metal shelf board and a reed slidably mounted on a sliding surface of the shelf board, the sliding surface of the shelf board being coated with a synthetic resin having a small frictional resistance. A piano characterized by being played. 2. The reed is provided with a reed sliding metal fitting in which the synthetic resin having a small frictional resistance is coated in the middle of the reed, and the reed sliding metal slides on the sliding surface of the shelf plate. The piano according to claim 1. 3. The reed includes a reed front portion and a reed rear portion each having a metal plate coated with the synthetic resin having a small frictional resistance, the reed front portion and the reed rear portion being the sliding surface of the shelf plate. The piano according to claim 1 or 2, which slides on the top. 4. The piano according to claim 1, wherein the sliding surface of the shelf plate is coated with polytetrafluoroethylene by sintering. 5. The sliding surface of the reed sliding metal fitting, the reed front portion, and the reed rear portion is coated with polytetrafluoroethylene by sinter molding on sliding surfaces with respect to the shelf plate. The piano according to any one of Items 1 to 4. 6. The piano according to claim 1, wherein the shelf plate is formed by combining hollow steel rectangular members having a rectangular cross section in a lattice shape.