JPH0116138Y2 - - Google Patents

Description

[Detailed description of the invention] This invention forms a first frame using iron angles or iron channels, and arranges a percussion/pin plate on the upper surface of this first frame and a sound board on the upper surface of this percussion. A hit pin seat plate and an iron plate are arranged on the upper surface of this soundboard, and the first frame and the iron plate are arranged,
A frame of a piano which is constructed by tightening bolts, and in which a tuning pin is installed in the pin plate, a hit pin is planted in the hit pin seat plate, and a string is stretched across the tuning pin and the hit pin.
Regarding soundboard structure.

As shown in Figure 1, the frame F of a conventional piano is a support base on which piano strings are stretched, and many strings are tightly stretched between the tuning pins and frame pins installed at both ends of the frame F. There is. For this reason, the tension of the strings reaches a total of 20 tons, and the frame F needs to be strong enough to withstand this, so that it does not become too heavy and allows for the acoustically necessary string length and arrangement. Flat area Fa and raised area (bone) Fb
It has a complex shape and is made by casting.

The frame F of such a conventional piano is extremely heavy, weighing about 1/3 of the total weight of the piano.
reach even.

The support structure supporting the frame F and the entire exterior structure need to be sufficiently robust, which increases the overall weight.

In view of these shortcomings, attempts have been made in recent years to reduce the weight of the frame F, by casting the frame F from aluminum alloy and using one or two strings for each note to reduce weight and cost. A proposal has been made.

However, such aluminum alloy piano frames do not have very good sound quality and are rarely used.

As shown in Fig. 2, the conventional piano frame F has a pin plate 2 and a beater 3 placed on the top surface of a wooden support 1, and a soundboard 5 having bridges 4 placed on the top of the spinner 3. A frame F is placed on the soundboard 5 and the pin plate 2, and after the frame F is bolted to the support 1, strings 6 are stretched around the hit pins 7 and tuning pins 8. With this configuration, the piano back mechanism is completed.

The back mechanism of such pianos uses a cast iron frame and a lot of wood, which increases the weight, and wood is greatly affected by ambient temperature and humidity, which can cause cracks, warping, twisting, etc. This in turn causes a misalignment of the action part and the point where the hammer is struck, leading to poor pronunciation and functional problems. Furthermore, if it affects the part where the strings are stretched, it will cause the tuned strings to become out of tune.

The above-mentioned failure prevention measures and performance maintenance required considerable effort and cost.

This idea was made in view of the above-mentioned drawbacks, and the first framework is formed by iron angles or iron channels to reduce weight, but without sacrificing acoustic properties. A pin board/beating ring is placed on this first frame, and a soundboard is placed on this beating ring, and a soundboard with the same width as the beating ring is placed on this soundboard, and a pin board/beating ring is placed on this first frame, and a soundboard with the same width as the beating ring is placed on this soundboard. A hit pin seat plate is provided, a steel plate is placed on the hit pin seat plate, the iron plate is passed from the iron plate to the first frame and fastened to the bolt/nut, and then a hole for the pin is made in the iron plate, and the above-mentioned A hitch pin is installed on the hitch pin seat plate, a tuning pin is installed on the pin plate, and one or two strings per note are strung across the tuning pin and the hitch pin, making it lightweight. The present invention provides a piano frame/soundboard structure that is designed to reduce the size and cost of the piano.

Hereinafter, embodiments of the piano frame/soundboard structure of this invention will be described in detail with reference to the drawings.

FIG. 3 is an exploded perspective view showing one embodiment of the piano frame/soundboard structure according to this invention, and FIG.
The assembled perspective view of the figure, Figure 5 is A-A in Figure 4.
FIG. 6 is a schematic plan view showing an example of string tensioning in FIG. 4.

In FIGS. 3 and 4, the first frame 11 is welded into the shape of a column by an iron angle or an iron channel with a U-shaped cross section.
1, a pin plate 19 and a driving turntable 12 are placed on top of the driving turntable 12, a sound board 13 is placed on the upper surface of the driving turntable 12,
A hit pin seat plate 15 is placed on the top surface of this sound board 13, and an iron plate 1 is placed on the top surface of this hit pin seat board 15.
Place 6.

Thereafter, as shown in FIGS. 5 and 6, bolts 10, 10...
After firmly fastening the required points with..., and planting the tuning pin and hitch pin on the pin plate and hitch pin seat plate, one or two strings are strung for each note.

In the figure, 14 is the bridge, 6 is the string, 7 is the hitch pin, 8 is the tuning pin, and 9 is the string catch.
As shown in FIG. 5, the string rest on the hit pin side may be formed by bending one end of an L-shaped iron angle outward.

With the above configuration, it is possible to obtain a piano frame/soundboard structure that is lightweight, has no warping or twisting of the frame, and has a simplified and easy manufacturing process, and is uniform in quality.

FIG. 7 is a perspective view showing another embodiment of the iron plate 16 used in the piano frame/soundboard structure of this invention;
8 is a partial cutaway view taken along the line B-B in FIG.
If an L-shaped angle is used and the sides of the hit pin seat plate 15, sound board 13, beater 12, and first frame 11 are covered with the iron plate 17,
The hit pin 7 can be installed at the side end of this iron plate 16.

Furthermore, one end of the iron plate 16 can be bent and used as a string rest mount 18, and the fact that the hitch pin 7 can be planted at the side end of the iron plate 16 in this way allows the force due to the tension of the strings 6 to be transferred to the iron plate 16. The hitch pin 7 is received on the inner end surface of the iron plate 16.
Stable locking and retention of the string can be achieved by driving the swage into the string.

As mentioned above, the piano frame and
According to the soundboard structure, the first frame is composed of an iron angle or an iron channel, and after placing and arranging the pin plate, beater, soundboard, and hitch pin seat plate on the upper surface of the first frame, Furthermore, place a steel plate on top of this,
The percussion, soundboard, and hitch pin seat board can be bolted together in a sandwich-like manner, and the strings can be tensioned by installing tuning pins and hitch pins in the pin board and hitch pin seat board, so that the strings can be tensioned. When using one or two strings, it is strong enough to withstand string tension, and is also light in weight.
Furthermore, the working process can be simplified and a piano frame/soundboard structure of uniform quality can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a schematic structural perspective view for explaining the structure of a conventional piano frame, Fig. 2 is a cutaway view of main parts for explaining the frame and soundboard structure on which the conventional piano frame is mounted, and Fig. 2 is a schematic structural perspective view for explaining the structure of a conventional piano frame. Fig. 3 is an exploded perspective view showing an embodiment of the piano frame/soundboard structure according to this invention, Fig. 4 is an assembled perspective view of Fig. 3, and Fig. 5 is a cutaway view taken along line A-A in Fig. 4. , Figure 6 is the fourth
7 is a schematic plan view showing an example of string tensioning, FIG.
FIG. 9 is a sectional view taken along the line B--B in the figure, and a schematic sectional view of a main part showing another embodiment of this invention using the iron plate shown in FIG. 7. In the figure, F...the frame of a conventional piano;
11... First frame according to this invention, 12... Beating turn, 1... Sound board, 14... Piece, 15... Hitchipin seat plate, 16... Iron plate, 17... Iron plate, 18...
...String mount, 19...Pin plate.

Claims (1)

[Claims for Utility Model Registration] (1) A first frame is formed of an iron angle or channel, and a perforation/pin plate is arranged on the upper surface of the first frame, and a resonator is provided on the upper surface of the perforation. A board is arranged, a hitch pin seat board is arranged on the top surface of the soundboard,
disposing an iron plate on the upper surface of the hit pin seat plate, bolting from the iron plate to the first frame, and implanting a tuning pin in the pin plate through the iron plate and a hit pin in the hit pin seat plate; A piano frame/soundboard structure characterized in that strings are stretched across the tuning pin and the hitting pin. (2) The piano frame/soundboard as set forth in claim 1 of the utility model registration claim, wherein the string receiving member on which the hit pin and strings are placed is located above the beating shaft. structure. (3) The piano frame/soundboard structure according to claim 1, wherein the hitch pin is installed at a position on the end side surface of the iron plate.