JP3453018B2 - Grand piano support unit - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strut unit for a grand piano.

[0002]

2. Description of the Related Art A strut unit for a grand piano has a function of supporting the tension of a string in cooperation with a frame and preventing deformation such as warping or twisting due to the tension of the string.
In order to fully exert such a function, it is necessary to firmly assemble the column unit itself.

FIG. 7 shows an example of a conventional strut unit. The column unit 51 includes a loading 52 having an outer shape of a grand piano, an inner stile 53 passed between both sides of the unloading 52, and three struts mounted between the unloading 52 and the inner sill 53. 54 and an intermediate frame 55 screwed to the front surface of the inner frame 53. These constituent members 5
Nos. 2 to 55 are made of wood, and are loaded 5
2, the inner frame 53 and the column 54 are connected to each other by a "hoso set". That is, for example, when the support column 54 is coupled to the loading 52, a mortise hole 56 is formed in advance on the inner side surface of the unloading 52 and the support column 54 is inserted in the mortise hole 56.
One end of the load 52, and screw 57 from the outer surface side of the loading 52.
The two 52, 54 are joined together by tightening firmly.

[0004]

In the conventional strut unit 51 described above, the coupling force between the stacking 52, the back frame 53 and the strut 54, which influences the supporting strength of the strut unit 51, is screwed into the strut 54 or the like in the axial direction. It depends only on the tightening force of the screw 57. Therefore, in order to secure the required supporting strength, it is necessary to sufficiently exert the tightening force of the screw 57, and for that purpose, a gap is not generated between the joint surfaces of these constituent members, It is necessary to accurately finish the length of the constituent members and the angle of the joint surface.

However, since each constituent member is made of wood and the pile 52 is formed in a particularly curved shape, it is inevitable that the dimensional accuracy of each constituent member varies.
For this reason, conventionally, at the time of assembly, a grinding operation is performed to eliminate a gap between the constituent members. This grinding work requires considerable skill,
It is becoming difficult to train and secure such skilled persons. Further, the grinding work requires a great deal of time even for a skilled person, which is a major cause of increasing the manufacturing cost of the grand piano.

The present invention has been made in order to solve such a problem, and a strong column unit can be easily assembled in a short time without requiring skill.
Accordingly, it is an object of the present invention to provide a strut unit for a grand piano that can significantly reduce the manufacturing cost.

[0007]

In order to achieve this object, a support unit for a grand piano according to claim 1 of the present invention is passed between a loading and unloading having an outer shape of the grand piano and both sides of the loading. A cross section having a rectangular cross section, a plurality of columns having a rectangular cross section attached between the loading and the back frame, and a column-loading connector for coupling one end of each of these columns to loading. The support-loading connector is fixed to the loading, is orthogonal to each other, and is provided with two support-mounting plate portions each formed with a screw insertion hole, and the support is a screw inserted into each of the screw insertion holes. It is characterized in that it is fixed to two column mounting plate portions.

In this strut unit, the strut-loading connector is fixed for loading, and the side face and the upper surface or the lower face of the strut are respectively brought into contact with the two strut mounting plate portions of the strut-loading connector. Then, by tightening the screws respectively inserted in the screw insertion holes of the two support column mounting plate portions, one end of each support column is coupled for loading. In this coupled state, the tightening force of the screw acts in two directions that are orthogonal to the axial direction of the column and orthogonal to each other, so that even if there is a gap G between the end face of the column and the column-loading connector, The tightening force of this screw ensures a high coupling force between the column and the loading. Therefore, the conventional grinding work is unnecessary, and the strut and the stack can be easily and firmly assembled in a very short time by only tightening the screws.

In this case, the column-loading connector further comprises two loading attachment plate portions which are orthogonal to each other and each have a screw insertion hole formed therein, and are fixed to the loading by the screws inserted into the screw insertion holes. Is preferably provided.
According to this configuration, the support-loading connector is firmly fixed to the loading by screws in two directions orthogonal to each other, so that the coupling force between the support and the loading is further increased.

In these cases, there is further provided an inner frame-loading connector for coupling at least one end of the inner frame to loading, the inner frame-loading connector being fixed to the loading and being orthogonal to each other, It is preferable that two back frame mounting plate portions each having a screw insertion hole are provided, and the back frame is fixed to the two back frame mounting plate portions by screws respectively inserted into the screw insertion holes.

According to this structure, the action obtained in the case of the connection of the support column and the loading in claim 1 can be similarly obtained in the connection of the back frame and the loading, and therefore, only the tightening of the screw is required. By this, it is possible to firmly and securely connect the inner frame and the pile in an extremely short time. As a result, the entire strut unit can be assembled more easily.

In this case, the back frame-loading connector is further provided with two loading attachment plate portions which are orthogonal to each other and each have a screw insertion hole formed therein, and are loaded by the screws respectively inserted in the screw insertion holes. It is preferably fixed.
According to this configuration, since the back frame-loading connector is firmly fixed to the loading by the screws in the two directions orthogonal to each other, the coupling force between the back frame and the loading is further increased.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a pillar unit of a grand piano to which the present invention is applied.
As in the conventional case, the support unit 1 is mounted between the loading 2 having the outer shape of a grand piano, the back frame 3 provided between the right and left sides of the loading 2, and the loading 2 and the back frame 3. Three columns 4, 4, 4 and a middle frame 5 screwed to the front of the back frame 3.
And are made of wood, such as elm and matoa.

In this strut unit 1, a hoso set similar to the conventional one is used for connecting each strut 4 and the back frame 3, whereas
A support-loading connector 6 is connected to each support 4 and the loading 2, and a middle back-loading connector 7 (back-loading connector) is connected to the connection between the back frame 3 and the middle frame 5 and the loading 2. Each is used. These connectors 6 and 7 are integrally formed of metal such as steel, aluminum, or casting, or resin.

As shown in FIG. 2, the column-loading connector 6 includes four rectangular mounting plate portions, that is, a loading lower surface mounting plate portion 6a and a loading side surface mounting plate portion 6b extending at a right angle from the front end thereof. And a column upper surface mounting plate portion 6c extending from the lower end thereof at a right angle to the front and a column side surface mounting plate portion 6d extending at a right angle from the central portion of the mounting plate portions 6b and 6c. 2 to 4 are attached to the mounting plate portions 6a to 6d, respectively.
Individual screw insertion holes 8 are formed.

The stack 2 and the column 4 are connected to each other by the column-loading connector 6 as shown in FIGS. 3 and 4. That is, first, the loading 2 is turned upside down,
In the state where the loading lower surface mounting plate portion 6a of the column-loading connector 6 is placed on the lower surface 2a of the loading 2, and the loading side surface mounting plate portion 6b is brought into contact with the inner surface 2b of the loading 2, the screw 9 Through the respective screw insertion holes 8 and tightened to fix the column-loading connector 6 to the loading 2. Next, the slit 4a formed at the center of one end of the support column 4 is attached to the support side surface mounting plate 6
The support 4 is attached to the support 4 and the support 4 is attached to the support upper surface 6c.
The column 9 is inserted into the screw insertion holes 8 in the state where the column 4 is mounted on the column 4, and is tightened to fix the column 4 to the column-loading connector 6.

In this combined state, as shown in FIG. 4, the column-loading connector 6 is fixed to the loading 2 by the screws 9 in two directions orthogonal to each other, and the screw 9 for fixing the column 4 is moved up and down. Direction and the left-right direction (vertical direction in the same figure), and the tightening force acts in two directions orthogonal to the axial direction of the column 4 and orthogonal to each other, even if the end face of the column 4 and the column-loading connector 6 Even if there is a gap G as shown in the figure between the and, a high coupling force can be secured between the column 4 and the loading 2 by the tightening force of the screw 9. Therefore, the conventional grinding work becomes unnecessary, and the column 4 and the loading / unloading 2 can be separated by only tightening the screw 9.
It can be easily and firmly assembled in a very short time.

As shown in FIG. 5, the middle back frame-loading connector 7 is provided with a loading top surface mounting plate portion 7a, a loading side surface mounting plate portion 7b extending from the front end thereof at a right angle, and a front surface thereof protruding. And a horizontal T-shaped middle frame attachment portion 7c and a U-shaped rear frame attachment plate 7d continuously extending from the side end thereof. More specifically, the middle rail attachment portion 7c is formed by a vertical Chukamachi side mounting plate portion 7c ₁ and horizontal Chukamachi lower surface mounting plate portion 7c _2, Okukamachi mounting portion 7d pair of left and right vertical rear It is composed of a frame side surface mounting plate portion 7d ₁ and a horizontal back frame lower surface mounting plate portion 7d ₂ . Mounting plate portions 7a, 7b, 7
c _1, 7c _2, 7d ₁ and each of the 7d _2, 2 to 4 pieces of screw insertion holes 10 are formed.

The inner frame 3 and the middle frame 5 are integrated into an L-shape by screwing with the upper surfaces flush with each other, and then the middle frame-stacking connector 7 is used to form the inner frame 5 and the middle frame 5, as shown in FIG. Combined with loading 2. That is, first, the Nakaokuseki-loading connector 7
Place the loading upper surface mounting plate portion 7a of the above onto the upper surface 2c of the loading 2,
And, with the loading side attachment plate portion 7b in contact with the inner side surface 2b of the loading 2, the screw 11 is passed through each screw insertion hole 10,
By tightening, the middle back frame-loading connector 7 is fixed to the loading 2. Next, one end of the back frame 3 is fitted into the back frame attachment portion 7d, and the middle frame 5 is attached to the middle frame attachment portion 7c.
The screw 11 through each screw insertion hole 10,
By tightening, the inner frame 3 and the middle frame 5 are fixed to the middle frame-loading connector 7.

In this coupled state, as in the case of coupling the support column 4 and the loading 2, the inner back frame-loading connector 7 is fixed to the loading 2 by the screws 11 in two directions orthogonal to each other, and The tightening force of the screw 11 for fixing the inner frame 3 and the inner frame 5 acts in two directions orthogonal to the axial direction of the inner frame 3 and the inner frame 5 and orthogonal to each other. Therefore, even if there is a gap between each end face of the back frame 3 and the middle frame 5 and the middle back frame-loading connector 7, the fastening force of the screw 11 causes the back frame 3 and the middle frame 5 to be loaded. A high binding force can be secured between the two. As a result, the conventional shaving operation is no longer necessary, and the inner stile 3 and the middle stile 5 and the stack 2 can be easily and firmly assembled in a very short time simply by tightening the screws 9.

As described above, according to the column unit 1 of this embodiment, the column 4 and the loading 2 are connected to each other through the column-loading connector 6 to connect the back frame 3 and the middle frame 5 to the loading 2. The coupling is performed through the middle-back frame-loading connector 7, and the coupling force is obtained by the tightening force of the screws 9, 11 in two directions orthogonal to the axial direction of the column 4, the rear frame 3, and the middle frame 5. Therefore, it is not necessary to perform a grinding work between the constituent members, which requires skill, and the strong column unit 1 can be assembled in an extremely short time and easily. As a result, it is possible to sufficiently cope with the recent trend of lack of skilled personnel, and it is possible to significantly reduce the cost of assembling the column unit,
Thereby, the manufacturing cost of the grand piano can be reduced.

The present invention is not limited to the embodiment described above, and can be implemented in various modes. For example, the shapes of the column-loading connector 6 and the middle back frame-loading connector 7 described above are merely examples.
For example, in the case of the former 6, the mounting plate portion of the support column 4 is formed in a U shape, and the slit 4a of the support column 4 is omitted so that U
You may make it fit in a character-shaped attachment plate part.

Alternatively, in the embodiment described, the back frame 3
And the middle frame 5 are integrated, and then connected to the stack 2, but the inner frame 3 is connected via the connector formed in conformity with the shape of the inner frame 3.
You may make it connect only to the loading 2 and fix the middle frame 5 to the back frame 3 after that. Further, in the embodiment, the back frame 3
Both ends of the center frame 5 and the middle frame 5 are connected to the stack 2 through connectors, but the connector may be used only at one end and the same hoso set as the conventional one may be used at the other end. However, the above-described effects of the present invention can be similarly obtained. In addition, the detailed configuration can be changed within the scope of the present invention.

[0024]

As described above in detail, the strut unit of the grand piano of the present invention allows the strong strut unit to be easily assembled in a short time without requiring any skill, thereby significantly reducing the manufacturing cost. It has the effect that it can be reduced to.

[Brief description of drawings]

FIG. 1 is a plan view of a pillar unit of a grand piano according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a column-loading connector of the column unit of FIG.

FIG. 3 is a perspective view showing a connection state between a support column and a loading column by the column-loading connector of FIG.

FIG. 4 is a plan view showing the same connection state as in FIG.

FIG. 5 is a perspective view showing a middle back frame-loading connector of the column unit of FIG.

FIG. 6 is a side view showing a state in which the inner frame and the inner frame are connected to the inner frame by the middle inner frame-loading connector of FIG. 5;

FIG. 7 is a plan view showing a strut unit of a conventional grand piano.

[Explanation of symbols]

1 Support unit 2 Loading 3 Back frame 4 Support 6 Support-Loading connector 6a Loading lower surface mounting plate 6b Loading side mounting plate 6c Support upper surface mounting plate 6d Support side mounting plate 7 Middle back frame-Loading Connector 7a Lifting top mounting plate 7b Loading side mounting plate 7d ₁ Back frame side mounting plate 7d ₂ Back frame bottom mounting plate 8 Screw insertion hole 9 Screw 10 Screw insertion hole 11 Screw

Claims (4)

(57) [Claims] 1. A loading machine having an outer shape of a grand piano, a rectangular cross-section frame extending between both sides of the loading frame, and a plurality of rectangular cross-sections mounted between the loading frame and the back frame. And a support-loading connector that connects one end of each of the plurality of support to the loading, and the support-loading connector is fixed to the loading and is orthogonal to each other. , A gland characterized by comprising two pillar mounting plate parts each having a screw insertion hole formed therein, and the pillar being fixed to the two pillar mounting plate parts by screws respectively inserted into the screw insertion holes. A pillar unit for a piano. 2. The column-loading connector further includes two loading attachment plate portions that are orthogonal to each other and each have a screw insertion hole formed therein, and the loading and unloading connector is equipped with a screw inserted into the screw insertion hole. The support unit for a grand piano according to claim 1, wherein the support unit is fixed. 3. An inner frame-loading connector that couples at least one end of the inner frame to the landing, the inner frame-loading connector being fixed to the landing and orthogonal to each other. At the same time, it is provided with two back frame mounting plate portions each having a screw insertion hole, and the back frame is fixed to the two back frame mounting plate portions by screws respectively inserted into the screw insertion holes. The strut unit for a grand piano according to claim 1 or 2, which is characterized in that. 4. The back frame-loading connector further comprises two loading attachment plate portions that are orthogonal to each other and each have a screw insertion hole formed therein, and the loading operation is performed with the screws inserted in the screw insertion holes, respectively. The support unit for a grand piano according to claim 3, wherein the support unit is fixed to the.