JPH09297572A - Frame for piano - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the frame which facilitates string extending operation and edging operation by providing a capotasto bar which is fixed to a frame main body and presses all extended strings to determine their overall length as another body. SOLUTION: The frame 1 consists of the frame main body 2 on which many strings 3 are extended and the capotasto bar 4 which presses the strings to determine their overall length and is in the different body. The frame main body 2 is formed of metal by casing using a mold. Many steel-made tuning pins 5 are provided nearby the front end part of the frame main body 2 and many steel-made hitch pins 6 are provided nearby the rear end part, and the strings 3 are extended between those pins 5 and 6 through the capotasto bar 4, etc. The capotasto bar 4 is made of metal and constituted by connecting a capotasto bar 40 for the low and intermediate registers and a capotasto bar 41 for the high register with the other. This constitution eliminates the need for an agraffe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame used in a piano, and more particularly to a frame structure that facilitates stringing work.

[0002]

2. Description of the Related Art Conventionally, in a frame used for a grand piano, as shown in FIG. 6, a large number of tuning pins 101 are provided on the front end side of the frame 100,
A large number of hitch pins 102 are provided on the rear end side. A large number of strings 103 are stretched between the large number of tuning pins 101 and a large number of hitch pins 102 so as to correspond to each key (not shown) of the piano, and a part of the frame 100 is provided on the treble side. The strings 103 are tuned via a capo-dastro bar (not shown) integrally formed so as to project to the back side of the 100a and 100b, and a long piece 105 provided on a soundboard (not shown). Pin 10
It is stretched between 1 and the hitch pin 102.

The capo dastro bar is for determining the string length together with the piece pin 106 of the long piece 105 by pressing the string 103, and a blade (not shown) as a contact portion with the string 103. Is equipped with. This blade is frame 1
After the casting of No. 00, a continuous blade is formed on the back surface of the frame 100 by hand or by making a blade with a machine (router).

On the other hand, the string 1
03 is a graph 104 and a long piece 105 or a short piece 107
Via the tuning pin 101 and the hitch pin 102
It is stretched between and. As shown in FIG. 7, the Agraph 104 is composed of a screw portion 104a and a head portion 104b, and this screw portion 104a is screwed into a screw hole (not shown) formed by threading the surface of the frame 100. By this, it is fixed to the frame 100.

The head 104b of the agraph 104 is provided with one to three small holes 104c, through which the strings 103 are passed. The agraph 104 is provided for each key of the piano, and the intervals between the strings 103 in each key, the horizontality, and the string length (the agraph 104 and the piece pin 106 or the short piece 107 of the long piece 105). The length of the string between the bridge and the piece pin 108) is correctly regulated. As a result, on the mid and low-pitched side of the piano, the string length is reduced even in a place where two or three strings are used for one key, and particularly in a place where these two or three strings are obliquely stretched. It is possible to arrange the sounds neatly.

[0006] The conventional frame 10 configured as described above
In No. 0, in the process before the stringing process at the time of assembling the piano, (1) Capo Dastro bar blade making work,
Three frame processing operations are performed: (2) threading work of a large number of screw holes for attaching the agraph 104 to the frame 100, and (3) operation of screwing the agraph 104 into the large number of screw holes.

[0007]

In the frame processing work of the above-mentioned prior art, the blade making work of (1) involves turning over the entire heavy frame 100 and performing manual work or a machine (router).
Since the blade is formed with, there is a problem that workability is poor and it takes time and effort. Further, the work of (2) thread cutting requires a lot of labor because many screw holes must be cut. Similarly, in the screwing operation (3), a large number of agraphs 104 have to be screwed into the screw holes, which takes time and effort.

After the frame machining work of (1) to (3) described above is completed, the stringing process is carried out. In the process of stringing the strings 103 in the middle and low-pitched parts, the small holes 104b of the agraph 104 are pierced. It is necessary to pass the strings 103 one by one, which is very troublesome and time-consuming. Similarly, the work of stretching the strings 103 in the treble part is also troublesome because it is necessary to pass the strings 103 under the capo dastro bar one by one. As described above, in the stringing process and the frame processing work before the stringing process, it takes time and labor, which causes an increase in cost.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a piano frame capable of easily and easily performing each work in a frame processing work and a stringing process and reducing costs. And

[0010]

According to the piano frame of the first aspect of the present invention, a frame main body on which a large number of strings are stretched, and all the stretched strings fixed to the frame main body have their chord lengths. It is equipped with a capo dastro bar that presses to determine.

According to this structure, the capo dastro bar which is fixed to the frame body and presses all the stretched strings so as to determine the string length thereof is provided, so that the agraph is unnecessary. Become. This eliminates the work of cutting a large number of screw holes and the work of screwing into the screw holes in the frame processing work, and also eliminates the work of passing the strings through the small holes of the agu in the stringing process. In addition, since it is possible to fix the capo dastro bar after tensioning the string in advance, it is unnecessary to pass the string under the capo dastro bar during the stringing process. become. Further, since the frame body and the capo / dastro bar are separate bodies, it is possible to perform the blade making work of the capo / dastro bar in the frame processing work without turning the frame body over. As described above, since the frame processing work and each work in the stringing process are omitted or simplified, each work can be performed easily and easily, and the cost can be reduced.

Further, in the above description, it is preferable that the capo-dastro bar is composed of a plurality of capo-dastro bars which are divided from each other in the musical range direction.

By doing so, when manufacturing the capo-dastro bar, it is sufficient to individually manufacture a plurality of capo-dastro bars and individually carry out the blade making work. The blade making work becomes easy.

Further, in the above, the capo dastro
The bar is preferably provided with a positioning member for laterally positioning the strings.

With this arrangement, the spacing between the strings can be regulated even without the agraph, so that the spacing between the strings can be neatly aligned as in a piano equipped with the agraph.

Further, in the above description, at a place where a plurality of strings are stretched on one key, a straight line connecting a plurality of piece pins on the capo / dastro bar side with which a plurality of strings engages and a plurality of strings are formed. It is preferable that a straight line connecting a plurality of parts of the engaging capo dastro bar is parallel to each other.

With this arrangement, at a position where a plurality of strings are stretched for one key, the strings have the same string length and are parallel to each other. In addition, the sounds produced by multiple strings corresponding to one key can be neatly arranged.

[0018]

DETAILED DESCRIPTION OF THE INVENTION Referring to the accompanying drawings,
A piano frame according to an embodiment of the present invention will be described. FIG. 1 is a plan view of a piano frame according to an embodiment, showing a grand piano (not shown).
1 shows a frame 1 used for.

In FIG. 1, the frame 1 comprises a number of strings 3
And a capo dastro bar 4 that is fixed to the frame body 2 and presses a large number of strings 3 so as to define the string length. The frame body 2 is made of metal and is formed by a casting method using a mold. Further, a large number of steel tuning pins 5 are provided near the front end of the frame body 2 (close to the lower part in the figure).
Is provided, and a large number of steel hitch pins 6 are provided near the rear end. Between the tuning pin 5 and the hitch pin 6, a large number of strings 3 (only a part of which are shown) are inserted through the capo-dastro bar 4, the short piece 7 and the long piece 8 to the bass side of the piano ( From the left side of the figure) to the treble side (right side of the figure)
It is stretched over.

The capo-dastro bar 4 is made of metal similarly to the frame body 2, and is formed by connecting a capo-dastro bar 40 for the middle and low-pitched parts and a capo-dastro bar 41 for the high-pitched parts to each other. And extends from the left end to the right end of the frame body 2. This capo dastro
The bar 4 is located at a position where it intersects or overlaps with the respective bone parts 20 to 24 of the frame body 2 and is attached to each of the bone parts 20 to 2 by the five screws 9.
4 is fixed. This screw 9 is a capo / dastro /
Inserted into holes (40b and 41b in FIG. 2 and others not shown) provided in the bar 4, and screwed into screw holes (22a in FIG. 2 and others not shown) provided in each bone portion 20-24. To do.
Also, the connecting portion of both capo dastro bars 40 and 41 is
The frame body 2 is fixed to the bone portion 22 with a screw 9 at a position intersecting the bone portion 22.

This fixed capo dastro bar 4
As shown in FIG. 2, in the connecting portion of 0 and 41, the projection 40a of the capo-dastro bar 40 for the middle and low-pitched sound and the projection 41a of the capo-dastro bar 41 for the high-pitched sound are connected to each other. Part 2
The two are meshed so as to come into contact with the upper surface and the side surface. In addition, both projections 4 of the capo dastro bar 40, 41
Holes 40b and 41b are provided so as to penetrate 0a and 41a. Screw 9 inserted in these holes 40b and 41b
However, the two capo-dastro bars 40 and 41 are connected to each other and fixed to the frame body 2 by being screwed into the screw holes 22a provided in the bone portion 22.

On the other hand, as shown in FIGS. 3 to 5, on the bottom surface 42 of the capo dastro bar 4, from the low-pitched sound portion to the high-pitched sound portion side, in correspondence with the string 3 stretched, a strip-shaped blade 43. Are formed. Then, as shown in FIG. 4, the string 3 wound around the tuning pin 5 is pressed upward by the string pillow 10 provided on the upper surface of the frame 2 between the tuning pin 5 and the capo dastro bar 4. , Then, while being pressed downward by the blade 43 of the capo dastro bar 4,
It is stretched to the hitch pin 6 side through the short piece 7 or the long piece 8.

Further, as shown in FIGS. 3 and 5, the strings 3 extending from the lowest note to the fourth string in order from the lowest note are the four strings 3 provided on the bottom surface 42 of the capo dastro bar 4. After being hooked by the positioning pin (positioning member) 11 and once moved to the left in FIG. 3, it is stretched to the piece pin 7a side of the short piece 7. This is because the strings 3 are hitch pin 6 so that the intervals between the strings 3 are even.
When the string 3 is stretched straight from the bottom to the tuning pin 5 side, the strings 3 from the lowest note to the 4th in order become closer to each other due to the shape of the frame body 2 and the positional relationship between the tuning pin 5 and the hitch pin 6. Since the strings 3 cannot be evenly spaced apart from each other, this point is eliminated to make the intervals between the strings 3 uniform.
Also, the four positioning pins 11 are made of metal,
By forming a predetermined hole in the bottom surface 42 of the dust bar 4 in advance and driving the positioning pin 11 into this hole,
It is fixed to the bottom surface 42 of the capo dastro bar 4.

Furthermore, on the side of the mid-high range of the piano, 1
At a place where two or three strings 3 are used for the key, as shown in FIG. 6, for example, the three strings 3 are 6 of the long piece 8 respectively.
It engages with the piece pins 8a and 8b of the book, and engages with the blade 43 of the capo-dastro bar 4 at three portions 43a. At this time, the straight line L1 connecting the three piece pins 8a on the side of the capo-dastro bar 4 with which the string 3 engages and the straight line L2 connecting the three portions 43a with which the string 3 engages the blade 43 are , Configured to be parallel to each other. This makes 2 for 1 key
Even at a place where three strings 3 are used, the strings 3 can have the same string length and the strings 3 can be parallel to each other. Therefore, the sounds produced by the two to three strings 3 provided for one key can be neatly arranged without using the graph, so that the graph is unnecessary.

A frame processing operation carried out by using the piano frame 1 of the present embodiment having the above structure,
The stringing process will be described. (A) First, five screw holes are screwed into the surface of the cast frame body 2 into which the screws 9 for fixing the capo / dastro bar 4 are screwed. (B) Separately from this, two capo-dastro bars 40 and 41 are produced by casting or the like, and a blade 43 is formed on the bottom surface 42 thereof. This blade making work is done manually or by machine (router). (C) Next, while attaching the tuning pin 5 to the pin plate (not shown) fixed to the frame body 2,
Attach the hitch pin 6 to the frame body 2. The entire string 3 is stretched between the tuning pin 5 and the hitch pin 6 with little tension applied.

(D) Further, the capo-dastro bar 40 for the middle and low-pitched parts and the capo-dastro bar 41 for the high-pitched parts of the capo-dastro bar 4 are connected to each other, and the connected capo-dastro bar is connected. -Fix the bar 4 to the frame body 2 via the five screws 9. (E) After that, the finished product of the soundboard (not shown) is attached to the piano (not shown), the frame 1 is placed on it, and the string 3 is hooked on the piece pins 7a, 8a, 8b to tune the tuning pin. Adjust the tension of the string 3 while turning 5. (Lower limit).

As described in the above steps (A) to (D), according to the piano frame 1 of the present embodiment, after all the strings 3 are stretched on the frame body 2 without applying much tension, Capo / Dastro Bar 4 with frame body 2
Since it is attached to, it is not necessary to pass the string 3 under the capo / dastro bar 4 during stringing work as in the conventional case, and workability is good. Further, since there is no agraph, it is not necessary to pass the string 3 through the hole of the agraph, and each work in the stringing process is simple and easy.

Further, in the frame processing work, the frame body 2 and the capo / dastro bar 4 are separate bodies, and the capo / dastro bar 4 is divided into two parts.
Since it is not necessary to turn over a very heavy frame as in the conventional blade making work, the blade making operation is simplified and the workability is improved. Also, because there is no Agraph,
There is no need for the work of threading a large number of screw holes and the work of screwing an agraph into a large number of screw holes, which has been done in the past to attach the graph. For this reason, the frame processing work is simple because the screw holes into which the screws 9 for fixing the capo / dastro bar 4 are screwed are only required to be threaded at five places.

As described above, simplification of the stringing process and frame machining work due to the absence of the agraph, and simplification of the blade making work due to the capo-dastro bar 4 being divided into two separate parts from the frame body 2 As a result, the cost required for the stringing process and the frame processing work can be reduced.

In the above embodiment, the piano frame of the present invention is used for a grand piano, but it may be used for an upright piano.

In the above embodiment, the capo-dastro bar 4 includes two capo-dastro bars 40 and 4.
1 is connected, but three or four capo dastro bars may be connected. Further, although the screw 9 is used as the fixing tool for fixing the capo-dastro bar 4 to the frame body 2, the present invention is not limited to this, and any fixing tool such as a bolt may be used.

Although the four positioning pins 11 are provided as the positioning members on the bottom surface 42 of the capo-dastro bar 4 in the above embodiment, the number of the positioning pins 11 may be any number. Also, instead of the positioning member,
The blade 43 of the dust bar 4 may be provided with a groove intersecting with the extending direction of the blade 43, and the string 3 may be locked therein. Further, the shape of the blade 43 of the capo dastro bar 4 may be any shape as long as it can support the tension of the strings 3.

[0033]

As described above, according to the piano frame of the present invention, a separate capo dastro bar is fixed to the frame body and pressed so as to determine the chord length of all the stretched strings. Since it has, it eliminates the need for Agraph. This eliminates the work of cutting a large number of screw holes and the work of screwing into the screw holes in the frame processing work, and also eliminates the work of passing the strings through the small holes of the agu in the stringing process. In addition, since it is possible to fix the capo dastro bar after tensioning the string in advance, it is unnecessary to pass the string under the capo dastro bar during the stringing process. become. Further, since the frame body and the capo / dastro bar are separate bodies, it is possible to perform the blade making work of the capo / dastro bar in the frame processing work without turning the frame body over. As described above, since the frame processing work and each work in the stringing process are omitted or simplified, each work can be performed easily and easily, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view of a piano frame according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a connecting portion of the piano frame according to the embodiment.

FIG. 3 is a partially enlarged view of FIG. 1;

4 is a cross-sectional view of FIG.

FIG. 5 is a front view showing a partial structure of a bass part of the capo dastro bar 4.

FIG. 6 is a view showing a state in which a string 3 is engaged with a piece pin 8 and a capo dastro bar 4 at a place where a plurality of strings are stretched on one key.

FIG. 7 is a plan view of a conventional piano frame.

FIG. 8 is an external view of a conventional Agraph.

[Explanation of symbols]

 1 Piano frame 2 Frame body 3 Strings 4 Capo Dastro bar 40 Capo Dastro bar 41 Capo Dastro bar 43a Multiple parts of Capo Dastro bar 8a Piece pin 11 Positioning member

Claims (4)

[Claims] 1. A frame body on which a large number of strings are stretched,
A frame for a piano, which is fixed to the frame body and includes a capo-dastro bar that presses all the stretched strings so as to determine the string length. 2. The piano frame according to claim 1, wherein the capo-dastro-bar is composed of a plurality of capo-dastro-bars which are divided from each other in the musical range direction. 3. The frame for a piano according to claim 1, wherein the capo dastro bar is provided with a positioning member for laterally positioning the strings. 4. The capo, dastro, and the plurality of strings engage with each other at a position where the plurality of strings are stretched on one key.
A straight line connecting a plurality of bar pins on the bar side and a straight line connecting a plurality of portions of the capo-dastro bar with which the plurality of strings engage is configured to be parallel to each other. The frame for a piano according to claim 1, 2 or 3.