JPH0647994U - Frame for piano - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a piano frame in which the sound quality and volume can be obtained according to the performer's preference by making it possible to change the rigidity of the capotatro bar. [Structure] The capo tastro bar 3 determines the length of the portion that vibrates by supporting the string from above. The rigid member fixing portion 3 is provided on the upper surface of the capotatro bar 3, and
Screw holes 33 are provided at various places. Rigid member fixing part 5
On the other hand, the first rigid member 11, the second rigid member 13, and the third rigid member 15 can be fixed by hexagonal screws. Each of the first rigid member 11, the second rigid member 13, and the third rigid member 15 is a plate member made of cast iron, which is the same material as that of the capotastrobar 3. 6 rigid members 11 to 15
One through-hole 11a to 15a is provided, and it can be fixed to the upper surface of the capotastro bar 3 with a hexagon screw. The more rigid members 11 to 15 are attached, the higher the rigidity of the capotatro bar 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a frame for a piano, and more particularly to a capotastro bar.

[0002]

[Prior art]

 Like the Agraph, the capo tastro bar of a piano frame accurately determines the length of a vibrating string. The capotatro bar is usually made of metal such as cast iron (Fc15 to 20) and supports the string from above to determine the length of the vibrating string. At that time, the rigidity of the capotatro bar also plays an important role as the string end condition of the vibrating string. In other words, if the stiffness of the capo tastro bar changes, the sound quality and volume produced by the piano will change subtly.

Conventionally, the rigidity of the capotastro bar of the piano frame has been determined at the design stage, and it was not possible to change the rigidity of the capotastro bar after the piano was assembled. In other words, the sound quality and volume produced by the piano were fixed due to the rigidity of the capo tastro bar that was decided at the piano design stage.

[0004]

[Problems to be solved by the device]

 However, in such a conventional piano frame, since the rigidity of the capo tastro bar was fixed, it was not possible to produce a sound quality and a volume sufficient to meet the taste of the performer. In particular, the scale of the strings supported by the capo tastro bar is considered to be the most melodic part of the piano, and the demands on the sound quality and volume are strict for the performer, and it is preferable to be able to adjust the sound quality and volume because the tastes are slightly different.

Therefore, the present invention solves such a problem, and an object thereof is to provide a piano frame in which the sound quality and the volume according to the taste of the player can be obtained by changing the rigidity of the capotatro bar. And

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention adopts the following configuration. That is, a capo tastro bar and a rigidity adjusting member that is provided separately from the capa tastro bar and can be fixed to the capa tastro bar are provided, and the rigidity of the capa tastro bar is adjusted by attaching and detaching the rigidity adjusting member to and from the capa tastro bar. The main point is a piano frame, which is characterized by making it possible.

[0007]

[Action]

 The piano frame of the present invention includes a rigidity adjusting member that is provided separately from the capotatro bar and can be fixed to the capotatro bar. This rigidity adjusting member can be attached to and detached from the capotastrobar to adjust the rigidity of the capotastrobar. The rigidity of the capo tastro bar also plays an important role as a string end condition that supports the vibrating string.By adjusting the rigidity of the capo tastro bar, the sound quality and volume can be subtly changed to suit the performer's preference. Can be adjusted to

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a part of a piano frame 1 as one embodiment of the present invention. The Piano frame 1 includes a frame portion such as a capo tastro bar 3.

The capotatro bar 3 defines the length of a vibrating string by supporting a string (not shown) from above. The capotatro bar 3 is made of cast iron (Fc15 to 20). A rigid member fixing portion 31 is formed on the upper surface of the capotatro bar 3, which is about 16 mm lower than the upper surface of a normal capotatro bar. The rigid member fixing portion 31 is provided with screw holes 33 at each of six positions at substantially equal intervals. The first rigid member 11, the second rigid member 13, and the third rigid member 15 can be fixed to the rigid member fixing portion 31 with a hexagonal screw (not shown).

The first rigid member 11, the second rigid member 13, and the third rigid member 15 are plate members made of cast iron, which is the same material as that of the Capotas trobar 3. The plate surfaces of the rigid members 11 to 15 are formed to have substantially the same size and shape as the upper surface of the capotastro bar 3, and the thickness of each sheet is about 8 mm. The rigid members 11 to 15 are respectively provided with six through holes 11a to 15a in accordance with the screw holes 33 of the rigid member fixing portion 31. The rigid members 11 to 15 can be fixed to the upper surface of the capotastro bar 3 by screwing the hexagonal screws into the screw holes 33 of the rigid member fixing portion 31 in a state of penetrating the through holes 11a to 15a.

As a pattern for selecting the rigidity of the capotastro bar 3, (a) when no rigid members 11 to 15 are attached, (b) when one of the rigid members 11 to 15 is attached, (C) When two of the rigid members 11 to 15 are attached, (d) Four types can be set when all of the three rigid members 11 to 15 are attached. This makes it possible to set different rigidity of the capotatro bar 3. The more rigid members 11 to 15 are attached, the higher the rigidity of the capotatro bar 3. Further, in the embodiment, all the three rigid members 11 to 15 have the same shape, material and size, but they may be formed differently. Various materials such as other metals can be used as the material, and the rigidity of the material allows the sound quality and volume to be finely adjusted.

FIG. 2 shows changes in sound quality and volume when the rigid members 11 to 15 are not attached to the capotastro bar 3 and when the first rigid member 11 and the second rigid member 13 are attached. Shows. FIG. 2A shows a frequency characteristic difference due to a change in rigidity of the capotastro bar 3 when the key is struck or struck hard. The solid line shows the frequency characteristic when none of the rigid members 11 to 15 is attached to the capotastro bar 3, and the dotted line shows the frequency characteristic when the first rigid member 11 and the second rigid member 13 are attached. There is. As can be seen from the figure, there is a difference in volume between the case where the rigid members 11 and 13 are attached and the case where they are not attached, especially at a frequency of around 4 kHz. When the rigid members 11 and 13 are attached, the frequency around 4 kHz is slightly higher than when not attached. The difference in the case of a weak hit is particularly remarkable, and the volume difference at 4 kHz is about 4 to 5 dB at the maximum.

FIG. 2B shows how a change in the rigidity of the capotastrobar 3 appears as a frequency characteristic difference with respect to a time change (attenuation). The frequency characteristics at the time of rising, 0.1 second, and 0.2 seconds after the key is struck are shown. Similar to FIG. 2A, the solid line shows the frequency characteristic in the case where no rigid members 11 to 15 are attached to the capotastro bar 3, and the case where the first rigid member 11 and the second rigid member 13 are attached. The frequency characteristic of is shown by the dotted line. As can be seen from the figure, the volume when the first rigid member 11 and the second rigid member 13 are attached is smaller than that when the first rigid member 11 and the second rigid member 13 are not attached, particularly in the frequency range of 1 kHz or less. That is, the higher the rigidity, the faster the attenuation in the frequency range of 1 kHz or less.

As described above, it has been found that the rigidity of the capotatro bar 3 causes the frequency characteristics to change subtly. In the piano frame 1 of this embodiment, the rigidity of the capotastro bar 3 can be adjusted in stages by attaching or removing the rigid members 11 to 15. How much rigidity is most suitable depends on various factors such as the preference of the performer and the characteristics of the piece to be played, and cannot be determined. As can be seen from the experimental example shown in FIG. 2, when the rigidity of the capotastro bar 3 is increased, the sound becomes sharp and there is no decay, and when the rigidity of the capotastro bar 3 is decreased, it becomes a legato sound where the attenuation remains.

As described above, according to the piano frame 1 of the present embodiment, the rigidity of the capastrob bar 3 can be adjusted by attaching or detaching the rigid member 11 to 15 to or from the capapostro bar 3 to which the strings are fixed. I am trying. As a result, it is possible to obtain the sound quality and volume that suit the performer's taste.

In the piano frame 1 of the present embodiment, even if the rigid members 11 to 15 are attached as shown in FIGS. It has not changed. The frequency around the fundamental is a major element of piano sound, and stable volume is desired. In that respect, even when the rigid members 11 to 15 are attached or detached, the frequency around the fundamental tone is stably generated, which is preferable.

Further, the size and the mounting place of the rigid members 11 to 15 may be any as long as they are the capo tastro bar 3, and may be mounted at an appropriate place according to the preference of the performer. At this time, if the hexagon bolts are used for fixing as in this embodiment, only a plurality of screw holes are provided in the capotatrobar 3, and the rigid members 11 to 15 may be attached at desired positions.

In addition, the place where the piano is installed is assumed to be used in various environments such as a soundproof lesson room, a home room, a venue for concerts and presentations, and a concert hall. Therefore, there is a suitable sound quality and volume suitable for each environment, and it is very convenient to be able to set the rigidity of the capo tastro bar 3.

[0019]

[Effect of device]

 As described above, according to the piano frame of the present invention, it is possible for the performer to change the rigidity of the capo tastro bar according to his / her preference, so that it is possible to obtain the sound quality and volume according to the preference of the performer. became.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a frame for Viano as one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an effect of the present embodiment.
(A) is explanatory drawing which shows the frequency characteristic difference when a key is hit | damaged strongly, and (b) is explanatory drawing which shows the frequency characteristic difference with respect to time change (attenuation).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Piano frame, 3 ... Capotatro bar, 11 ... 1st rigid member, 11a ... 1st rigid member through-hole, 13 ... 2nd rigid member, 13a ... 2nd
Rigid member through hole, 15 ... Third rigid member, 15a ...
・ Third rigid member through hole, 31 ... Rigid member fixing portion, 3
3 ... Screw hole

Claims (1)

[Scope of utility model registration request] 1. A capo tastro bar and a rigidity adjusting member that is provided separately from the capa tastro bar and can be fixed to the capa tastro bar are provided, and the rigidity adjusting member is attached to and detached from the capa tastro bar to remove the capa tastro bar. A piano frame characterized by adjustable rigidity.