Metal working – Method of mechanical manufacture – Sound device making
Patent
1997-12-15
2000-11-14
Echols, P. W.
Metal working
Method of mechanical manufacture
Sound device making
84177, 84438, G10C 312
Patent
active
061451975
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of assembling a grand piano, an outer rim for a grand piano and a manufacturing method thereof, an arm for a grand piano and fabricating method thereof, and a keyboard musical instrument.
BACKGROUND ART
FIGS. 22-24 illustrate the structure of a conventional grand piano, and FIG. 21 illustrates a process of assembling the same. Conventionally, a grand piano is generally assembled in accordance with the following procedure:
A. First, a backpost 1, an inner rim 2, a back beam 3, and so on are "tenoned together" to assemble a backpost assembly 4.
B. After the top surface of the inner rim 2 is formed with a curved plane and grooves for accommodating sound ribs therein, a sound board 8 having sound ribs 6 and bridges 7 (a long bridge 7a and a short bridge 7b) previously mounted thereon is adhered to the top surface of the inner rim 2. Subsequently, the outer periphery of the adhered sound board 8 is ground for reshaping such that the outer periphery of the sound board 8 matches the outer periphery of the inner rim 2.
C. A pin block 9 and a plate 12 are once placed on the sound board 8 for defining the height of the bridges. Specifically, a bridge height line is drawn on side surfaces of the respective bridges using a previously provided jig, and top surfaces of the bridges are ground to the bridge height line to define a predetermined bridge height.
D. After defining the bridge height, the plate 12 and the pin block 9 are removed, and each of the bridges 7 is cut to form recesses in the top surface thereof for carrying strings thereon, and the lengths of vibrating portions of the strings are defined. In parallel, the removed plate 12 is painted, and hitch pins 14 and agraffe 15 are mounted on the plate 12.
E. A previously formed outer rim 10 is adhered to the outer periphery of the inner rim 2 of the backpost assembly 4. The outer rim 10 is made, for example, of a laminated plate having a total of 15 layers of lauan plywood and decorative single plates of makore adhered to the top and rear surfaces of the lauan plywood laminate. These lauan plywood and decorative single pates are laminated and inserted between an outer mold and an inner mold of a pressing machine, wherein they are pressurized, adhered, and formed into a shape matching the configuration of the inner rim 2.
F. Next, the frontage dimension of the outer rim 10, i.e., the dimension between the inner surfaces of the left and right front ends of the inner rim 2 is adjusted. Specifically, if the frontage dimension, with the outer rim 10 attached thereto, is smaller than a predetermined dimension, the inner surfaces of the inner rims 2 are cut to adjust the frontage dimension.
G. The inner rim 2 and the outer rim 10 are formed with arms at left and right front portions thereof. Specifically, the left and right front portions of the inner rim 2 and the outer rim 10 are respectively cut so as to match predetermined shapes of the respective arms.
H. Next, a decorative single plate (not shown) is glued on each cut surface, and the surfaces of the outer rim 10 and the inner rim 2 including the decorative single plates are spray-painted by a spray gun (base painting).
I. A previously formed and painted keybed 11 is fixed on the lower surface of the outer rim 10 between the left and right ends of the outer rim 10.
J. A pin block 9 is fixed between the left and right front ends of the inner rim 2 of the backpost assembly 4. The plate 12 is also fixed to the backpost assembly 4 in a state in which the plate 12 is carried on the sound board 8 and the pin block 9. Subsequently, after tuning pins 13 are embedded into the pin block 9 through the plate 12, strings S are stretched between the tuning pins 13 and the hitch pins 14 through the bridges 7.
K. Next, a vertical bosom space (the vertical distance from the top surface of the keybed 11 to a string securing points of the strings S) is measured, and the top surface of the keybed 11 is cut for adjustment to define a predetermined dimension of the vertica
Arimori Manabu
Kitashima Riichi
Nakao Yutaka
Echols P. W.
Kabushiki Kaisha Kawai Gakki Seisakusho
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