JPS5843015Y2 - Keyboard receptacle on a grand piano - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improved keyboard receptacle for a grand piano that has less warping and sagging and smoother sliding action.

Figure 1A schematically shows the internal structure of a grand piano, where a keyboard receptacle b arranged on a shelf a supports a large number of keys and an action mechanism C integrally thereon. However, in order to be able to remove it for adjustment of the action mechanism C, and to enable slight lateral movement by operating the soft pedal P to reduce the volume as shown in the figure, In general, the keyboard is placed on the shelf a without being fixed in any way to the shelf a, and is held in place by a keyboard holder d at the rear end (left end in FIG. 1).

Therefore, the keyboard receptacle b tends to warp or twist due to aging, and there are problems such as the action mechanism C not being adjusted properly or the receptacle b not sliding smoothly. The lubricant (mainly graphite) could not be sufficiently applied to the surface because it would stain clothes when the reed b was removed during adjustment of the action mechanism.

This idea was made to solve the above-mentioned drawbacks.It consists of three parts (upper and lower), which are fixed to the shelf around the lower mackerel, and the upper mackerel and the lower mackerel are always kept in close contact with the lower mackerel by adjusting screws. To provide a keyboard receptacle that can be easily maintained and slid, is less likely to warp or twist, and can be sufficiently lubricated.

To explain the illustrated embodiment, in Fig. 2, 1 is the upper reel, and the front reel 1a, rear reel 1b, and middle receptacle that form the front and rear crosspieces (the right side is the front and the left side is the rear in the figure). The middle plate 1C, which serves as the balance fulcrum of the keyboard, and the end plates 1d on both sides,
It is formed into a horizontally elongated lattice shape with a plurality of middle plates 1e arranged at required intervals between them, and the front plate 1a is fixed so as to cross the end plates 1d on both sides and the upper surface of the middle plates 1e. As shown in FIG. 3, in the lower surface of the end plate 1d and the middle lug 1e, where the front plate 1a is located, the lower surface of the rear half is arcuately thin and the front half is a thick flat portion If.
The rail tree 1f, which forms a ', is installed laterally with a part protruding forward so as to form a step at the front end, and
b is fixed to the rear end of each end plate 1d and the middle plate 1e in a stepped manner, and the front rail tree 1f is fixed at the rear end.
A flat portion 1b' is formed to be symmetrical to this, and its lower surface is on the same horizontal plane as the lower surface of the flat portion If' of the rail tree 1f.

A keyboard sliding fitting 1g is provided on the end plate 1d and the base hook 1e on both sides of the recess 1C so as to be adjustable up and down.

In the drawings, the screw is shown as a screw with the head facing down, but other screws may be used.

On the other hand, the lower reed 2 is the front lower reed 2a and the rear reed 2.
b and the lower gable plates 2d on both sides attached in a butt state to form a frame shape, the width of which in the front and back direction is 1.
A plurality of block pieces 2C are fixed at required intervals along the front end edge on the lower front 2a, and the rear end edge is fixed on the lower back 2b. Block pieces 2C are fixed at the same spacing and number at a position slightly inside, and a plate 2d having an adjustment screw 2e in the center is fixed onto these block pieces 2C.

Therefore, when assembling the above members, first the rail wood 1
- of the flat part If' of f and the flat part 1b' of the rear part 1b
Apply a lubricant such as graphite to the lower surface of L, and place the upper receptacle 1 on the lower receptacle 2 by inserting it between the front and rear block pieces 2C from the sides of the lower receptacle 2, overlapping them. Thereafter, as shown in FIG.
The crocodile 3 is inserted through the part d and fixed to the shelf board a, and the rear end edge of the bottom reed 1 is held in place by a keyboard grip 4 at a plurality of places.

Also, align both side edges of the upper receptacle 1 with the side edges of the lower receptacle 2, and adjust the lower end head upward by operating the adjustment screws 2e provided on the plate 2d on each block piece 2C. Flat parts If' and lb' forming steps before and after 1
, and restrains the front and rear edges of the upper reed 1 from above.

Thereafter, as shown in FIG. 6, a front pin 5 is placed on the front 1a of the top receptacle 1, a balance pin 6 is placed on the middle 1C of the receptacle, and a keyboard pillow 7 is placed on the rear 1b of the receptacle 1. A required number of keyboards k are assembled on top.

In this state, when the soft pedal p is depressed as described above, the upper reed 1 is guided by the front and rear block pieces 2C via the connecting rod and is slid slightly to the right with respect to the lower reed 2. Accordingly, the keyboard and the action mechanism C also move slightly to the right to perform a so-called soft operation.

As described above, in this invention, the keyboard receptacle is structured with a lattice-shaped upper receptacle and a frame-shaped lower receptacle, the lower receptacle is fixed to the shelf board around the periphery, and the upper receptacle is fixed on the lower receptacle. Since they fit together so that they can slide, and the front and rear edges are restrained by multiple adjustment screws, warping and twisting are less likely to occur compared to conventional keyboard keys, and the action mechanism is less likely to go out of order. In addition, even if you remove the keyboard receptacle when adjusting the action mechanism, the upper and lower receptacles are integrated and the sliding surface will not be exposed to the outside. Sufficient lubrication can be applied and sliding operations can be performed easily.

[Brief explanation of drawings]

Figure 1A is a partial sectional view schematically showing the inside of a grand piano, Figure 1A is a front view of the keyboard receptacle movement mechanism, and Figure 2
3 is a side view of the upper receptacle, FIG. 4 is a side view of the lower receptacle, FIG. 5 is a perspective view of a block piece of the lower receptacle, and FIG. Figure 6 is a side view of the keyboard with the keyboard mounted on the receptacle. In the figure, 1 is the top, 1a is the front, 1b is the back, 1b
' is the flat part, 1C is the middle part, 1d is the end plate, 1e is the middle part, 1f is the rail book, If' is the flat part, 2 is the bottom part, 2a
2b is the front of the bottom, 2C is the block piece, 2d
is the lower gable board, 2e is the adjustment plate, and 2f is the plate.

Claims (1)

[Scope of utility model registration request] An upper reel 1 formed in a lattice shape with a front reel 1a, a rear reel 1b, a middle reel 1C, end plates 1d on both sides, and a middle lug 1e;
It consists of a lower retarder 2 formed into a frame shape with a lower retarder front 2a, a lower retarder rear 2b, and lower gable plates 2d on both sides, and a rail tree 1f is installed laterally on the lower surface of the front end of the upper retarder 1. When attached, a part of the flat part 1f' thereof is projected forward to form a step, and a flat part 1b' forming a step is also provided at the rear end of the reed rear 1b,
A plurality of block pieces 2C are provided on the lower receptacle front 2a of the lower receptacle 2 along the front edge, and a plurality of block pieces 2C are provided on the lower receptacle rear 2b along the slightly inner side of the rear edge. A plate 2f having an adjusting screw 2e is provided on each block piece 2C, and the lower receptacle 2 is fixed to the shelf board a through the block piece 2C, and the upper receptacle 1 is fixed to the lower receptacle 2. A keyboard receptacle in a grand piano which is restrained by an adjustment screw 2e.