JPH02789Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a piano that aims to reduce weight, reduce the number of parts used, generate deep bass, and increase volume.

As shown in Fig. 1, a conventional vertical piano has a support frame F consisting of a girder 1, a box 2, a base 3, and a support post 4, and a pin plate 5 is fixed to the front upper part of this support frame F. A dowel 6 is fixed around the support frame F at the lower part, and a soundboard 10 with a short bridge 7 and a long bridge 8 arranged on the front side and a plurality of sound bars 9 on the rear side is attached to the dowel 6. It has a structure in which a frame 11 is attached to the pin plate 5 and the soundboard 10, and a tuning pin 12 implanted in the pin plate 5 and a hitting pin 13 implanted in the frame 11. In between, place the strings 15 on the short piece 7 or long piece 8 and the string pillow 14.
The vibration energy generated by hitting the strings with a hammer (not shown) is transmitted to the soundboard 10 via the pieces 7 and 8 to emit sound.

Here, the support frame F is usually made of wood, but as is well known, it is easily affected by temperature and humidity.
There are disadvantages such as not being able to obtain a homogeneous product. In addition, the frame 11 is usually made of cast iron, but since it is formed by casting in a sand mold, the dimensional accuracy is uneven.
In order to obtain strength, a large cross-sectional area is required, which has the disadvantage of being heavy.

This invention was devised in view of the above points, and will be explained below with reference to the drawings.

As shown in Fig. 2, a girder 1 made of iron or the like with a U-shaped cross section is arranged in the upper part with a window 16 for the tuning pin 12 in the front, and a girder 1 made of iron or the like with a U-shaped cross section is arranged in the lower part. A base 3 made of iron material or the like with a square or square cross section that is inclined towards the treble section is arranged, and a plurality of columns 4 made of iron material or the like with a square square cross section are installed vertically on both sides and between the girder 1 and the base 3. It is made by welding. Of these, the support 4 installed between the girder 1 and the base 3 is constructed by cutting out the lower end surface of the cross section of the girder 1 that intersects with the tuning pin window 16, and fittingly welding it into the support frame. Form F.

The pin plate 5 is fixed to the back surface of the girder 1 with wood screws and adhesive, with a groove 17 into which both side pieces of the column 4, each having a U-shaped cross section, are fitted, at the point where the pin plate 5 intersects with the intermediate column 4. 5 through the tuning pin window 16 of the girder 1, and the string pillow 14 is attached below the tuning window 16.
On the other hand, the hitch pin 13 is implanted and fixed to the base 3.

As shown in FIG. 3, the punch 6 is fixed to the base 3 on the back side of the support frame F, the support supports 4 on both sides, and the pin plate 5.

The soundboard 10 is formed to have the same outer circumferential dimensions as the drum 6, and has a long piece 8 and a short piece on its front surface, with a moat 18 cut out at the point where it intersects with the pillar 4 shown in FIG. 2, as shown in FIG. The piece 7 is fixed, and multiple sounding rods 9 are attached to the back side.
It becomes stuck.

After the soundboard 10 is turned and fixed so that the edge of the moat 18 of the long piece 8 does not come into contact with the support 4, the moat 1
8. Glue the piece bridge 19 that fits onto the upper part.

One end of the string 15 is locked to the hit pin 13, and the other end is wound around the tuning pin 12 and stretched over the short bridge 7 or the long bridge 8 and the string pillow 14.

In this way, the support frame F is formed of iron material with a square or square cross section that has bending strength and buckling strength, so it has both the strength of wood and casting in a conventional piano, so the wooden support frame F This eliminates the need for the cast frame 11, and compared to a piano structure using only a cast frame, steel plate, or iron plate, there is less twisting of the support frame F due to string tension.
Thin-walled iron rectangular pipes and channels can be used for the girders 1, foundations 2, and pillars 4 that form the structure.

Furthermore, a sound board 10 having the same dimensions as the sound board 10 formed on the entire outer periphery of the rear surface of the support frame F is formed with a sound board 6.
By attaching it to the top, the vibration area of the soundboard 10 can be widened, so the mass of the soundboard 10 increases, and the stiffness decreases, making it easier to generate deep bass, and the unit Since the acoustic radiation resistance per unit area increases, it has the advantage that an extremely large sound volume can be obtained.

Furthermore, by providing a moat 18 at the part where the long piece 8 intersects with the support column 4 and connecting it with a piece bridge 19, the long piece 8 is formed as one long piece without being divided by the support post 4, and the entire soundboard 10 is formed. The vibrational energy of the string 15 is transmitted to the string 15, resulting in a beautiful tone and rich volume.

Therefore, the overall weight of the piano is light and the number of parts is small, and it is easy to generate deep bass sounds.
A piano with increased volume can be provided.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view of a conventional vertical piano, Fig. 2 is a front view of a piano according to an embodiment of this invention, Fig. 3 is a sectional view taken along line AA in Fig. 2, and Fig. 4 is a longitudinal sectional view of this invention. FIG. 5 is an enlarged view of the main part of the support frame according to the embodiment, and FIG. 5 is a partially cutaway enlarged view of the long piece according to the embodiment of this invention. In the figure, 1... Girder, 2... Box, 3... Foundation, 4... Support, 5... Pin plate, 6... Driving,
7...short piece, 8...long piece, 9...sound stick, 10...
Soundboard, 11... Frame, 12... Tuning pin, 13... Hitchi pin, 14... String pillow, 15
...Strings, 16...Tuning pin window, 17...
Groove, 18...moat, 19...Komabashi, F...post frame.

Claims (1)

[Scope of utility model registration request] It is made of metal with a U-shaped cross section, has a window 16 for the tuning pin 12 on the front side, a girder 1 with several notches on the bottom, and is flat on the bass side and sloped on the middle and treble sides. A support frame F is formed by a base 3 and a support 4 which has both ends of the base 3 and the girder 1 welded together, one end of the base 3 is welded to the middle, and the other end surface is fitted and welded to the notch of the girder 1. A pin plate 5 with a groove 17 is fitted and attached to the back surface of the girder 1, and a pin plate 5 is provided with a groove 17 at a position facing the support column 4 which is fitted and welded to the notch of the girder 1. A tuning pin 12 is installed through the window 16, a string pillow 14 is attached to the girder 1, and a hitting pin 13 is installed on the base 3. The driver 6 is attached to the driver, and the driver 6 has a short piece 7 on the front.
and a long piece 8 having a moat 18 at a position intersecting with the pillar 4, and a sound board 10 having a plurality of sound rods 9 fixed to the back side, and the moat 18 of the long piece 8 is fixed.
A bridge 19 is fixed to the string, one end of the string 15 is locked to the hitting pin 13, and the string 15 is placed on the short piece 7 or the long piece 8 and the string pillow 14, and the other end is wrapped around the tuning pin. A piano featuring