JPH02713B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a support structure for a soundboard body in a vertical piano, which reduces the number of parts and the number of processing steps, and reduces manufacturing costs.

[Conventional technology]

The soundboard body of a piano transmits the vibration energy of the strings to the entire soundboard, amplifies it, and radiates it to the outside as the sound of the piano performance. It is no exaggeration to say that the sound quality and volume of the music are primarily determined. For this reason, in the case of a vertical piano, a conventional soundboard body is usually constructed as shown in FIG. 1 and attached to a support body. That is, 1 is a soundboard body, which has a substantially rectangular soundboard 2 formed into a plate shape and having a large surface area. This soundboard 2 is made of multiple veneers 2 with well-evened grains, such as Japanese pine and spruce, which have a light specific gravity, are rich in elasticity and flexibility, and have excellent vibration characteristics.
a, 2b, 2c... are formed by aligning their grain directions (direction of arrow A) in a tessellated manner, and a long piece 3 extending long in the grain direction of the soundboard 2 is formed approximately at the center of the surface thereof. It is adhesively fixed, and a short piece 4 is adhesively fixed near the lower end periphery. On the other hand, 7 to 15 sound bars 5 are adhesively fixed to the back surface of the sound board 2 at appropriate intervals. These sound rods 5 are arranged to extend long in the direction perpendicular to the grain direction of the soundboard 2 (in the direction of arrow B), so that they are connected to the soundboard 2 via the long bridge 3 or the short bridge 4. Transmitted string (not shown)
It has a function as a vibration transmission member that transmits vibrations in a direction perpendicular to the grain direction of the soundboard 2, and a function as a strength member of the soundboard 2. The soundboard body 1 is pasted and fixed on the surface of a column main body 6 formed in the shape of a rectangular frame that is approximately the same size as the soundboard 2, and the center portion is provided with a crown that gently curves toward the surface side. has been done.

Here, the support main body 6 includes a pair of left and right support supports 7.
a, 7b, an upper spar 8 connecting the upper ends of the pair of columns 7a, 7b, and the pair of columns 7a, 7.
A frame 10 consisting of a large base 9 connecting the lower ends of b.
and a frame-shaped turning 11 adhesively fixed to the surface peripheral part of this frame 10, and this turning 11
The peripheral edge of the soundboard 2 is adhesively fixed to the surface of the soundboard 2.
Further, a plurality of rod notches 12 into which the end portions of the sound rods 5 are fitted are formed on the surface of the driving shaft 11.

The assembling process of the pillar body 6 involves assembling the pair of pillars 7a and 7b, the upper girder 8, and the large base 9 in one piece.
After assembling the frame 10 by making a pair connection, the surface is finished to be flat and the punching mawashi 11 without the rod cutout 12 is attached, and after that, the surface of the punching mawashi 11 is finished and the rod notch 12 is formed. ing.

In this case, the surface finishing of the frame body 10 and the beater 11 must be carried out on the front and rear surfaces of the strut body 6, that is, on the joint surfaces of the soundboard body 1, due to machining errors in the assembly of each component. This is because a difference in level is likely to occur on the opposite side, making it impossible to properly bond and fix the winding 11 and the soundboard 2. That is, if we look at the frame 10, each support 7a, 7b
The plate thickness of the column is made thinner than in the front-rear direction on the upper and lower end surfaces, that is, the holo plane, and one square 14 extending in the width direction is provided at the center in the plate thickness direction, and this is attached to the upper girder 8 and the large base 9. Since the frame 10 is assembled by fitting into the grooves 15 provided at the center of the end face from the sides of the large base 9, due to machining errors in the grooves 14 and 15, the supports 7a, 7b and the large base 9 may Displacement in the front-rear direction (thickness direction) cannot be corrected, and a step is created on the surface of the frame 10.

In addition, in Fig. 1, the support main body 6 is shown lying horizontally, but in reality, in the case of a vertical piano, it is arranged upright with the large base 9 facing down and the soundboard body 1 facing forward, that is, toward the player. It is something that

[Problem to be solved by the invention]

As described above, since the conventional support main body 6 is composed of two members, the frame body 10 and the driver 11,
The number of parts increases, and it is necessary to process and form each component, assemble the frame 10 and finish its surface, install the punch 11 and grind its surface, and cut the rod 1.
Since it requires many steps such as processing and forming in step 2, it has the disadvantage that its production is troublesome and takes a long time, and productivity is poor.

Therefore, it is an object of the present invention to provide a support structure for a soundboard body in a vertical piano, which solves the above-mentioned problems, has a simple structure, reduces the number of parts, and simplifies assembly work. This is the purpose.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a soundboard body in which a long bridge and a short bridge are fixed to the front surface of the soundboard, and a plurality of sound bars are fixed to the back surface of the soundboard. , a pair of left and right columns,
It comprises a rectangular frame-shaped column main body formed by integrally connecting an upper girder and a large base, and a rear surface circumferential edge of the soundboard is fixed to a front outer circumferential edge of the column main body. A driving part is integrally provided over the entire circumference, and the assembly part of the support main body is formed in the thickness direction on the inside and end faces of the ends of the support, the upper girder, and the main base, respectively. It is composed of a bottom groove and a bottom groove that are fitted from the thickness direction.

[Effect]

In this invention, the pillar main body is a pair of left and right pillars,
A protrusion formed by the upper girder and the large base and integrally protruding from the outer peripheral edge of the surface (front surface) thereof forms a driving part. The 〓 and 〓 grooves fit into each other from the thickness direction (front-to-back direction) of the support main body, aligning the front surfaces of the support, upper girder, and base.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 2 is an exploded perspective view showing one embodiment of the support structure for a soundboard body according to the present invention, FIG. 3 is a cross-sectional view of the main part of the same structure, and FIG. 4 is a front view of the main part of the support body.
In the drawings, the same constituent members and parts as in FIG. 1 are designated by the same reference numerals, and their explanations will be omitted. In these figures, the pillar main body 20 to which the soundboard body 1 is pasted is formed into a rectangular frame shape with a pair of left and right pillars 7a, 7b, an upper girder, and a large base 9, and the outer peripheral edge of its surface (front surface) is the front, that is, the soundboard body 1
It protrudes from the side over the entire circumference to form a striking part 22, and a sound board 2 is attached to the surface (tip surface) of this striking part 22.
The periphery of the back surface is fixed with adhesive as shown in FIG.

The pair of pillars 7a, 7b, the upper girder 8, and the large base 9 each have a diameter 24 integrally provided in the inner half of the upper and lower end surfaces of each pillar 7a, 7b in the plate thickness direction (front-back direction of the pillar body 20). The upper girder 8 and the large base 9 are integrally connected by fitting into grooves 25 formed in the thickness direction on the inner surfaces of both ends of the upper girder 8 and the large base 9, respectively, from the thickness direction, and joining them together with an adhesive or the like. In this case, the above-mentioned 〓24 and 〓groove 25 are
a, 7b, the upper girder 8, and the large base 9 in the thickness direction to enable relative movement of these members in the front-rear direction, that is, in the thickness direction. When the strut 7 is fitted,
The surfaces of a, 7b, upper girder 8 and large base 9 can be easily aligned flush so that there are no steps,
In other words, gradually fit the corners 24 of the pillars 7a, 7b into the grooves 25 of the large base 9 from the front of the large base 9 until the grooves 22 protruding from the front surfaces of both members become flush. After that, if you connect them integrally with adhesive etc., there will be no step and the pillar body 20
No surface finishing is required.

Each sound bar 5 fixed to the back surface of the sound board 2 is formed shorter than the conventional sound bar 5, which extends to the edge of the sound board 2, so that the end surface 5a thereof extends to the edge of the sound board 2.
As shown in the figure, it has a dimension larger than the width d of the striking portion 22 and is located inside the edge of the soundboard 2. Then, the end of each sound rod 5 and the support main body 2
An appropriate gap is set between the sound board 2 and the pillar body 20, and this makes it possible to adjust the position in the horizontal and vertical directions when attaching the soundboard 2 to the pillar body 20, and also eliminates the need for rod cutouts, which were conventionally required. No formation is required, making the production of the support main body 20 even easier.

〔Effect of the invention〕

As described above, in the support structure of the soundboard body in the vertical piano according to the present invention, the support structure is composed of a pair of support pillars, an upper girder, and a large base, and the outer peripheral edge portion of the support body is integrally projected. Since the structure is such that the peripheral edge of the back surface of the soundboard is fixed to this striking part, there is no need for the striking part, which was conventionally formed separately, and therefore the number of parts and processing steps are small, making it easy to manufacture. It is. In addition, the bottom and bottom grooves that make up the bottom assembly part of the column body are formed in the thickness direction of the column body, and they fit into each other from the thickness direction, so that the column, upper girder, and large foundation are The surfaces of the rotating parts can be easily aligned to prevent the occurrence of steps, and therefore, surface finishing of the support body is not required, and the number of man-hours for manufacturing and assembling the support body can be greatly reduced.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing a conventional support structure for a soundboard body, FIG. 2 is an exploded perspective view showing an example of a support structure for a soundboard body in a vertical piano according to the present invention, and FIG. FIG. 4 is a cross-sectional view of the main part of the same structure, and FIG. 4 is a front view of the main part of the support main body. 1... Soundboard body, 2... Soundboard, 3... Nagakoma, 4...
... Short piece, 5... Sound stick, 7a, 7b... Support, 8...
... Upper girder, 9 ... Large base, 20 ... Pillar body, 22
...Turning section, 24...〓, 25...〓groove.

Claims (1)

[Claims] 1 A soundboard body consisting of a long bridge and a short bridge fixed to the front surface of the soundboard and a plurality of sound bars fixed to the back surface, a pair of left and right supports, an upper girder, and a large base are integrally connected together. and a rectangular frame-shaped support main body, and a rounded part to which a back surface peripheral edge of the soundboard is fixed is integrally protruded over the entire circumference on the outer peripheral edge of the front surface of the support main body. and the assembled portion of the support main body is
A vertical piano characterized in that it is comprised of a groove and a groove that are formed in the inner surface and end surface of the end of the pillar, the upper girder, and the main base, respectively, in the plate thickness direction, and are fitted from the plate thickness direction. Plate support structure.