JPS581824Y2 - Piano pin plate mounting structure - Google Patents

Description

[Detailed description of the invention] This invention relates to a piano bin plate mounting structure that allows for easy removal from the piano body.

The pin plate of a piano is integrally fixed to the bottom of the tuning pin planting part of the frame and rotatably holds the lower end of the tuning pin planted in the tuning pin planting part, and in the case of a grand piano. It is fixed to the curved support that makes up the piano body.

Figures 1 and 2 show the mounting structure of this type of pin plate, and the pin plate 1 is made by laminating and gluing a plurality of relatively hard veneers, such as maple wood, so that the grain directions alternately intersect with each other. It is horizontally fixed via fastening means such as bolts to the upper surface of a curved support 3, which together with the soundboard 2 constitutes the main body of the piano.

On the upper surface of the pin plate 1, a tuning pin mounting portion 4a at one end of a frame 4 formed by casting from a metal such as cast iron is placed and integrally fixed by bolting.

A large number of tuning pin installation holes 5 are formed in the tuning pin installation part 4a of the frame 4 from the bass to the treble area.
A tuning pin 7 in the form of a rod with a circular cross section made of brass or the like that locks one end of the string 6 of each pitch is fitted and implanted through a bushing 8, and its lower end corresponds to the tuning pin installation hole 5. The tuning pin T is screwed into a tuning pin fitting hole 9 formed in the pin plate 1, and by adjusting the rotation of the tuning pin T, the tension of the string 6 can be variably set and the string 6 can be tuned. ing.

By the way, in the pin plate 1 having such a configuration, it is desirable that the force for holding the tuning pin I is sufficiently greater than the rotational torque of the tuning pin 7 due to the tension of the string 6, and that the pin plate 1 does not become loose. However, this holding force deteriorates due to the pin plate 1 expanding and contracting due to changes in temperature, humidity, etc. over many years of use, and due to frequent tuning operations, which can cause the strings 6 to become out of tune.

Therefore, in such a case, it is necessary to replace the pin plate 1, but in the conventional mounting structure described above, the pin plate 1 cannot be replaced unless the frame 4 is removed from the curved support 3. Therefore, the removal work was extremely difficult.

Therefore, this invention has been improved in view of the above-mentioned circumstances, and provides a piano pin board mounting structure that allows the pin board to be easily removed from the piano body without removing the frame. The feature is that the frame is directly fixed to the upper surface of the curved support, and a pin plate fixed to the bottom of the tuning pin installation part of the frame is arranged between the curved supports.

Embodiments of this invention will be described in detail with reference to the drawings.

Figure 3 is a perspective view of the bottle plate mounting structure according to this invention;
The figure is a partially cutaway front view of the same, and the same components as in FIGS. 1 and 2 are designated by the same reference numerals.

In the frame 4, both ends of the tuning pin installation part 4a are placed at predetermined positions on the upper end surface of the curved support 3, and are fastened with bolts 10. The pin plate 11 is a plurality of tightening bolts 1
2. In other words, the pin plate 11 is not placed on the tuning pin installation part 4a of the frame 4 like a conventional pin plate, but is fixed to the bottom surface of the tuning pin installation part 4a. Therefore, both end surfaces 13a and 13b of the pin plate 110 are in contact with or in close proximity to the inner surface of the curved support 3, and can be fixed and held on the curved support 3 via an L-shaped fixing bracket or the like as necessary. be done.

As is clear from the above configuration, the pin plate 11 is fixed to the frame 4, so when replacing the pin plate 11, just pull out the tuning pin T from the frame 4 and tighten it by removing the bolt 12 on the piano. It can be removed from the main body, and the operation is extremely simple and easy since there is no need to remove the heavy frame 4 as in the conventional case.

Moreover, since the pin plate 11 does not play the role of supporting the frame 4, it is not required to have high strength, and therefore, it is sufficient that it has the minimum width dimension necessary for fitting and implanting the tuning pin 7. Materials can be saved, and 2.
It is possible to have an appropriate divided structure such as division or three divisions, and to replace each part.

As explained above, according to the piano pin plate mounting structure according to this invention, the frame is directly fixed to the piano body and the pin plate is fixed to the bottom of the frame.
It is possible to significantly simplify the work of replacing the pin plate, and the pin plate itself can be made smaller, saving materials.
That effect is a dog.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional pin plate mounting structure for a grand piano, FIG. 2 is a vertical sectional view thereof, and FIG. 3 is a perspective view showing an embodiment of the piano pin plate mounting structure according to this invention.
FIG. 4 is a partially cutaway front view thereof. 3... Curved support, 4... Frame,
4a...Tuning pin installation part, 11...
...Pin board.

Claims (1)

[Scope of utility model registration request] A piano characterized in that a frame is fixed to the upper end surface of the curved column, and a pin plate is fixed to the bottom surface of the tuning pin planting part of the frame, and both end surfaces of the pin plate are opposed to the inner surface of the curved column. pin plate mounting structure.