JPS5843017Y2 - Keyboard receptacle on a grand piano - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a keyboard receptacle for a grand piano that is less likely to warp or twist due to aging and to allow smooth lateral movement.

In general, in a grand piano, as shown in Fig. 1 A2, a keyboard receptacle b disposed on a fence plate a integrally supports the required number of keys and an action mechanism C thereon. , it is possible to remove the action mechanism C for adjustment;
In order to enable lateral movement by operating the soft pedal P to reduce the volume, the conventional keyboard receptacle is made entirely of wood and is placed on the fence plate a without being fixed to the fence plate a in any way. It is placed on the keyboard, and its rear edge is merely held in place by the keyboard grip d.

Therefore, the keyboard receptacle b is prone to warping or twisting due to aging, and there are drawbacks such as difficulty in adjusting the action mechanism C or smooth lateral movement of the receptacle b.

This idea was made to solve the above-mentioned drawbacks, and it has a double structure with an upper and lower receptacle, and the ends corresponding to the front and rear of both receptacles are made of metal or synthetic resin. By arranging a rail member, the lower reed is restrained by a gripping member at the rear edge, and the front end is fixed to the fence board, allowing the upper reed to slide against the lower reed via a number of rollers. To provide a keyboard receptacle which is connected in a restrained state to prevent warping and twisting due to aging and allows smooth lateral movement when operating a soft pedal.

To explain the embodiment with reference to the drawings, in FIG. 2, A is a lower reel, which is formed into a frame shape by a lower reversing front rail 1, a lower reversing rear rail 2, and lower end plates 3 on both sides. The lower front rail 1 and the lower rear rail 2 are made of metal or synthetic resin shapes, and the lower front rail 1 has a central flange 1a, grooves 1b on both sides, and stepped flanges 1C at both ends. A roller 4 is formed in a compound shape with a roller 4 held by a retainer over a required length range in each groove part 1b.
A screw insertion hole 1d is provided at both ends of the bottom part 1b, and the lower rear rail 2 has a rear thick flange 2a, a center part 2b, and a front flange 2C. The rollers 4b are formed into a single groove shape, and a plurality of sets of rollers 4b held by retainers over a required length range are accommodated in the groove portion 2b, as shown in FIG.

Also, in Figure 2, B is the upper receptacle, and the lower receptacle A
The vertical and horizontal lengths are slightly smaller than that, and a part of both sides has been cut out, and the upper rail 5, the rear rail 6, the middle and both sides of the upper gable board 8, and the plurality of middle rails in between. 9 is formed in a lattice shape, and the upper front rail 5 and the upper rear rail 6 are made of metal or synthetic resin shapes,
The upper front rail 5 is formed into a single groove shape by a flat bottom plate 5a and a pair of upright pieces 5b provided at the center to match the width of the central flange 1a of the lower front rail 1. A plurality of sets of rollers 4b held by retainers over a required length are housed in the section 5C, and a restraining plate 10 made of a strip material is provided thereon. The bottom end is the fifth
As shown in the figure, it is fixed to the center flange 1a of the lower front rail 1.

In this way, the upper front rail 5 is compressed and held by the roller 4b housed in its own groove 5C and the roller 4a housed in the grooves 1b on both sides of the lower front rail 1, as shown in FIG. However, as shown in FIG. 5, a long hole 13a is formed in the screw insertion portion of the bottom plate 5a of the upper front rail 5 to have enough space for operating the soft pedal.

Further, on the upper surface of the upper front rail 5, crossbars 14 are attached to both sides of the groove 5C for arranging the front pins of the keyboard.

The upper rear rail 6 is also made of a metal or synthetic resin profile, and includes a flat bottom plate 6a and a pair of upright pieces 6b provided at the rear to match the width of the groove 2b of the lower rear rail 2. As shown in FIG. 6, a plurality of sets of rollers 4b held by a retainer over a required length are housed in the groove 6C, and a restraining plate 10 made of a strip material is placed on top of the rollers 4b. A screw 12 is inserted through this restraining plate 10, and its lower end is fixed to the bottom wall of the groove 2b of the lower rear rail 2.

Therefore, the upper rear rail 6 is pressed and held by the roller 4b accommodated in its own groove 6C and the roller 4a housed in the groove 2b of the lower lower rear rail 2.
As shown in the figure, a long hole 13b is formed in the screw-inserted portion of the upper rear rail 6 and has a sufficient clearance for pedal operation.

Furthermore, a crossbar 15 for attaching a keyboard pillow is attached to the front upper surface of the groove 6C of the upper rear rail 6.

The keyboard receptacle configured as described above is placed on the fence plate a as shown in FIG. A clapboard 16 is arranged in the front rail 1 from the lower surface of the fence plate a to the front rail 1 through the hole 1d.
The screw 17 is screwed through and the lower plate A is the clapboard 16.
Also, the thick flange 2a at the rear end of the lower rear rail 2 is restrained by a gripping member 18 fixed to the fence plate a.

(In Fig. 6, the top receptacle B is omitted to clarify the installation state).

Then, the crosspiece 1 on the front rail 5 of the upper rectangle B shown in FIG.
Although not shown in FIG. 4, a front pin, a balance pin on top of the middle plate 7, and a pillow on the crosspiece 15 on the rear rail 6 are attached, so that the required number of keyboards are arranged on the top plate B. .

Therefore, when playing the piano, if you step on the soft pedal P as described above, one of the middle or 9 of the upper receptacle B will be pushed to the right via the connecting rod, and the upper receptacle B will be pushed to the lower receptacle. Sa A
The software is moved to the right by the required amount to facilitate switching of software operations.

As mentioned above, this design has a double structure with a frame-shaped bottom and a lattice-shaped top, and the front and back parts of both sides, which correspond to the front and back, are made of metal or synthetic resin. A rail member having at least one bottom portion made of
A large number of rollers are housed in each groove, and the upper and lower reeds are slidably restrained via a number of rollers at the front and rear rail portions, and the lower reed is held at its rear edge by a member. Since the front end is fixed to the fence board, the action mechanism can be properly adjusted without warping or sagging due to aging, unlike conventional methods.
Also, when operating the soft pedal, the upper reed moves horizontally without any creaking.

[Brief explanation of drawings]

FIG. 1A is a partial cross-sectional view schematically showing the inside of a grand piano, and FIG. 1B is a front view of the keyboard receptacle moving mechanism. FIG. 2 is a perspective view of an embodiment of this invention. Figure 3 is its side view. FIG. 4 is a sectional view taken along line A-A in FIG. 3. FIG. 5 is a sectional view taken along the line CC in FIG. 3. FIG. 6 is a sectional view taken along the line CC in FIG. 3. FIG. 7 is a side view showing how the lower reed is attached. In the diagram, A is the bottom rail, B is the top rail, 1 is the bottom rail,
1a is the center flange, 1b is the groove, 1d is the screw insertion hole, 2 is the lower rear rail, 2a is the thick flange, 2b is the groove, 3 is the lower end plate, 4a, 4b are the rollers, 5 is the Upper front rail, 5a is the bottom plate, 5b is the groove, 6 is the upper rear rail, 6a is the bottom plate, 6b is the groove, 7 is the middle, 8
is the top board, 9 is the middle board, and 10 is the deterrent board.

Claims (1)

[Scope of utility model registration request] The lower receptacle consists of a frame-shaped lower receptacle A and a lattice-shaped upper receptacle B, and the front and rear parts of the lower receptacle A are made of metal or synthetic resin and have at least one groove part 1b, 2b. It is formed by a rail 1 or a lower rail 2, and the front and rear parts of the upper rail B are also made of metal or synthetic resin and have a single miso part 5.
It is formed of the upper front rail 5 or the upper rear rail 6 having the above-mentioned front and rear upper and lower rails 1, 5c, and 5c.
2, 5.6 grooves 1b, 2b and 5c, 5
A large number of rollers 4a and 4b are accommodated in each of the grooves 5c of the rails 5 and 6 at the front and back of the upper reel.
, 6c, a restraining plate 10 is arranged on the roller 4b,
The restraining plate 10 is fixed to the front and rear rails 1 and 2 of the lower reed A, and the lower reed A is restrained at the rear edge by a gripping member 18 attached to the fence plate a, and the front part is attached to the fence plate a. The key receptacle on a grand piano that is fixed.