JPH11338463A - Reinforcing core adjusting structure in string instrument such as electric guitar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide relatively simplified structure, to reduce an effect on tone quality, and to surely adjust warpage of a neck. SOLUTION: A straight groove 21 for a reinforcing core 4 is formed in a surface of a neck 1, and the core 4, an adjusting nut 6 and a reinforcement member 22 are assembled in the groove 21 to be covered by a finger board 5. The core 4 is formed by a round bar made of iron or the like to penetrate the member 22, a flange 23 is provided in its one end, and a male screw part 225 for screwing the adjusting nut 6 in is formed in its other end. The reinforcement member 22 is formed by cutting one portion of a circumferential face in a central part of an iron pipe without cutting its both ends, and the member 22 is thereby constituted of a trough part 22A of a C-shaped cross-section and a cylindrical part 22B provided in the both ends of the trough part 22A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing core adjusting structure for a stringed musical instrument such as an electric guitar.

[0002]

2. Description of the Related Art A rod-type musical instrument, particularly an electric guitar or a folk guitar using a steel string, has a greater tension on the whole string than a general acoustic guitar using a string such as a sheep intestine. On the other hand, a so-called rod warpage (upward warpage) that deforms in a concave shape occurs. In addition, the rod warps convexly with respect to the string depending on the material of the rod itself and the degree of drying (warpage).
Sometimes. The warp of the rod is not uniform, and a part of the rod may be warped. When the rod is warped in this way, the spacing between the strings and the fret changes, making it difficult to play. Therefore, a reinforcing core is conventionally incorporated in the rod, whereby the rod is deformed in the direction opposite to the warping direction to adjust the rod warpage (Japanese Utility Model Publication No. Sho 63-31098, Japanese Utility Model Publication No. Sho 56-14553). JP-A-07-1
No. 99908).

FIG. 5 shows an example of a conventional reinforcing core adjusting structure. In this reinforcing core adjusting structure, the base end 1a is
A reinforcing core insertion hole 3 is formed in a rod 1 having a head portion 1b integrally formed at the distal end thereof.
A reinforcing core 4 made of iron is inserted as a truss rod, and a finger plate 5 is joined to the surface of the rod 1. The insertion hole 3 for the reinforcing core is not a straight hole,
Is bent in a V-shape so as to be convex in the downward warp direction (direction of arrow A). The reinforcing core 4 has one end 4a fixed to the base end 1a of the rod 1, the other end 4b protruding toward the surface of the head 1b, and an adjusting nut 6 screwed to the protruding portion. In addition, 8 is a fret.

In such a structure, the adjusting nut 6
Is tightened with a wrench to apply tension to the reinforcing core 4, so that the reinforcing core 4 tries to straighten, so that the rod 1 is deformed in the direction of the arrow A against the tension of the string 7, and the adjusting nut 6 is When loosened, the string 7 is deformed in the direction of arrow B by the tension of the string 7, whereby the upward warpage or downward warpage of the rod 1 can be corrected.

FIG. 6 is a perspective view showing another conventional example of the reinforcing core adjusting structure. The reinforcing core adjusting structure shown in FIG. 1 is configured by reinforcing a rod with a reinforcing member 10 formed of iron, an aluminum alloy, or the like and having a U-shaped cross section, and incorporating the reinforcing core 4 inside the reinforcing member 10. It is.

[0006]

However, in the conventional reinforcing core adjusting structure shown in FIG. 5, even if the amount of warping is large, even if the warping of the rod 1 is corrected by the reinforcing core 4, the entire length of the rod 1 is required. There was a problem that twisting occurred. In addition, since the adjusting nut 6 is directly received at the opening end surface of the reinforcing core insertion hole 3 formed on the rod 1 on the side of the neck portion 1b, when a large tension is applied to the reinforcing core 4, the adjusting nut is not used. 6 bites into the opening end face. Therefore, the reinforcing core 4 cannot function sufficiently as a truss rod, and there is a problem that the warpage of the rod 1 cannot be reliably corrected.

In the conventional reinforcing core adjusting structure shown in FIG. 6A, since the cross-sectional shape of the entire reinforcing core adjusting structure is increased by the reinforcing member 10, an insertion hole or groove having a large hole diameter is formed in the rod. Therefore, there has been a problem that the sound quality of the musical instrument is reduced and the strength of the rod itself is reduced. When the reinforcing member 10 is made of iron, the strength and rigidity of the reinforcing member 10 are large because the cross-sectional shape of the reinforcing member 10 is U-shaped over the entire length. Therefore, a large force is required to deform the reinforcing member 10. There was also the problem of doing. On the other hand, depending on the material such as aluminum, the sound quality of the musical instrument may be adversely affected, which is not preferable.

The present invention has been made to solve the above-mentioned conventional problems, and has as its object to relatively straighten the structure, to have little effect on sound quality, and to reliably correct the warpage of the rod. It is an object of the present invention to provide a reinforcing core adjusting structure for a stringed instrument such as an electric guitar.

[0009]

According to a first aspect of the present invention, there is provided a metal reinforcing member buried in a rod, a reinforcing core penetrating the reinforcing member, and a reinforcing core of the reinforcing core. An adjusting nut screwed to one end protruding from the reinforcing member, wherein the reinforcing member has two C-shaped cross-sections, each of which is integrally connected to both ends of the gutter. And a cylindrical portion of the above.

[0010] The second invention is the above-mentioned first invention, wherein:
The gutter portion is characterized in that it has a length of 50 to 90% of the entire length of the reinforcing member.

In a third aspect based on the first or second aspect, the gutter portion and the cylindrical portion are formed by cutting a part of a peripheral surface of a central portion except for both end portions of the pipe. The cutting depth in the pipe radial direction is 30 to
70%.

In the first aspect, the strength of the gutter portion forming the central portion of the reinforcing member is lower than that of the cylindrical portions at both ends. Therefore, when the adjusting nut is tightened to apply a compressive force to the reinforcing member, the gutter portion is reduced. Elastically deforms to correct the warpage of the rod. In the second invention, the ratio of the gutter portion is 50% of the entire length of the reinforcing member.
Up to 90% is a range in which the rigidity of the reinforcing member can be freely designed according to the rigidity of the rod and the portion of the rod to be bent. In the third aspect, since the cut depth of the gutter portion is set to 30 to 70% of the pipe diameter, the rigidity of the reinforcing member can be freely adjusted according to the rigidity of the rod and the portion of the rod to be bent. It is the range that can be designed. The reinforcing member can be easily deformed. If it is less than this, it is difficult to bend and cannot be easily adjusted, and if it is more than this, it is difficult to correct the deformation of the rod due to excessive bending.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is an external perspective view of a rod portion of an electric guitar provided with a reinforcing core adjusting structure according to the present invention,
FIG. 2 is a sectional view of the rod portion, and FIG. 3 is an exploded perspective view of the reinforcing core adjusting structure. In the drawings, the same components as those shown in the section of the prior art are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In these figures, one end is located at the center of the surface of the rod 1 in the width direction and the end face 20a of the base end 1a.
, And a straight reinforcing core groove 21 whose other end is open to the surface of the neck portion 1b is formed. A reinforcing adjustment structure is formed, and the surface of the rod 1 is covered with a fingerboard 5. The reinforcing core groove 21 is formed at the same depth over the entire length.

The reinforcing core 4 is formed of a round bar made of iron or the like, penetrates the reinforcing member 22, and has a flange 23 at one end.
Are provided integrally. The flange 23 is joined to one end surface of the reinforcing member 22 by welding or the like, is located in a concave portion 24 formed between the joint surface between the base end portion 1a of the rod 1 and the body body 8, and includes the reinforcing core 4 and the reinforcing member. 22 is prevented from coming out of the reinforcing core groove 21 toward the neck 1b. On the other hand, a male screw portion 25 is formed at the other end of the reinforcing core 4. The male screw portion 25 projects from the reinforcing member 22 and faces the opening of the reinforcing core groove 21 on the neck portion 1b side, and the adjusting nut 6 is screwed thereto.

The reinforcing core 4 has a length of 500 mm and an outer diameter of 5 to 6 m, depending on the size of the musical instrument.
m, the length of the male screw part 25 is about 20 mm. The adjusting nut 6 has a length of about 50 mm and an outer diameter of about 10 mm, and has a screw hole 26 formed at one end thereof for screwing with the male screw portion 25, and a hexagonal hole 27 for a wrench formed at the other end. Have been.

The reinforcing member 22 is formed by cutting a peripheral surface of the pipe made of metal (iron or the like) over a considerable length from a central portion while leaving both ends. Therefore, the reinforcing member 22 is composed of a gutter portion 22A having a C-shaped cross section and a cylindrical portion 2 integrally provided at both ends of the gutter portion 22A.
2B, the strength of the reinforcing member 22 itself is reduced by the gutter portion 22A except at both end portions to facilitate deformation. Both ends 28 of the gutter portion 22A are formed in a gently curved shape to avoid concentration of stress when the reinforcing member 22 is deformed. The tub 22A is a reinforcing member 22.
The center is not limited to the central symmetric length, and the center can be appropriately shifted depending on the place to be bent. Such a reinforcing member 22 includes:
The gutter portion 22A is assembled into the reinforcing core groove 2 with the gutter portion 22A facing downward.

The reinforcing member 22 has a length of 400 to 6
00 mm and an outer diameter of 6 to 8 mm. When the length of the reinforcing member 22 is 500 mm, the length of the gutter portion 22A is 350 m
m, the length of each cylindrical portion 22B is about 100 mm and about 50 mm. The length of the gutter portion 22A is about 50 to 90% of the entire length of the reinforcing member 22, and the cut depth W is
About 30-70% of the diameter of 1 and preferably 40-50
%. The length of the cylindrical portion 22B is
About 5 to 25% of the total length of By changing the length of the gutter portion 22A and the length of the left and right cylindrical portions 22B, it is possible to determine which part of the rod 1 is bent and how. Note that the cut depth W of the gutter portion 22A does not need to be constant over the entire length, but is changed depending on the position, or is changed in a gentle curved shape so that the central portion is maximum and the end portion is minimum. You may.

In such a reinforcing core adjusting structure, when the reinforcing core 4 and the reinforcing member 22 are assembled, a reinforcing core groove 21 is formed in the center of the surface of the rod 1 over the entire length, and then the reinforcing core 4 is inserted. The member 22 is inserted and arranged in the reinforcing core groove 21 with the gutter portion 22A facing downward. Thereafter, the rod 1 and the body 2 are joined, the fingerboard 5 is adhered to the surface of the rod 1 to cover the reinforcing core groove 21, and the mounting of the reinforcing core 4 is completed.

In the reinforcing core adjusting structure having such a structure, in order to correct the warpage of the rod 1, a wrench is inserted into the hexagonal hole 27 of the adjusting nut 6 and the adjusting nut 6 is tightened. Press against the end face. When the adjusting nut 6 is pressed against the reinforcing member 22, the reinforcing member 22 receives a compressive force, so that the gutter portion 22 </ b> A is deformed mainly in the direction of the arrow A so as to be convex with respect to the string 1. This reinforcing member 2
The deformation 2 is easy because the gutter portion 22A is weaker in strength than the cylindrical portion 22B. At this time, the reinforcing core 4 also curves together with the reinforcing member 22 to correct the warpage of the rod 1.

Further, since the adjusting nut 6 is pressed against the end surface of the reinforcing member 22 to deform the reinforcing core 4 and the reinforcing member 22, the reinforcing core 4 functions as a truss rod and reliably corrects warpage. be able to. Further, since the reinforcing member 22 can be formed by cutting a part of the peripheral surface of the pipe, the production is easy. In addition, since a cylindrical pipe is used, the cross-sectional shape of the reinforcing core adjustment structure itself is smaller than that of the case using the U-shaped reinforcing member shown in FIG. 6, and the depth and the width are smaller. A small reinforcing core groove 21 can be formed in the rod 1. Further, since the end of the gutter portion 22A is formed in a shape in which stress is unlikely to concentrate, there is no risk of buckling deformation. Further, if iron or an alloy containing iron is used as the material of the reinforcing member 22, the acoustic member is more excellent than the aluminum alloy.

In the embodiment described above, an example is shown in which the adjusting nut 6 is exposed to the front side of the neck portion 1b and assembled, but as shown in FIG.
It is also possible to incorporate the adjusting nut 6 so as to be located on the a side. In this case, a concave portion into which a wrench for turning the adjustment nut 6 is inserted may be formed on the lower surface side of the body 2.

[0022]

As described above, according to the reinforcing core adjusting structure of the stringed instrument such as the electric guitar according to the present invention, the influence on the sound quality is small, and the warpage of the rod can be easily and accurately corrected. . In addition, the structure of the reinforcing member is simple and can be easily manufactured. In addition, since the adjusting nut is pressed against the reinforcing member to deform the reinforcing core, the reinforcing core can function as a truss rod. . Also, the gutter portion is about 50 to 90% of the entire length of the reinforcing member,
The cutting depth is about 30 to 70% of the diameter of the reinforcing member,
Since the length is preferably about 40 to 50%, the degree of deformation of the reinforcing member can be adjusted according to the rigidity of the rod, and a design that can easily correct the rod can be realized.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a rod portion of an electric guitar provided with a reinforcing core adjusting structure according to the present invention.

FIG. 2 is a sectional view of the rod portion.

FIG. 3 is an exploded perspective view of the reinforcing core adjusting structure.

FIG. 4 is a cross-sectional view of a rod showing another embodiment of the present invention.

FIG. 5 is a sectional view showing a conventional example of a reinforcing core adjusting structure.

FIG. 6 is a cross-sectional view showing another conventional example of a reinforcing core adjusting structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rod, 2 ... Body body, 4 ... Reinforcement core, 5 ... Fingerboard, 6 ...
Adjustment nut, 7: string, 8: fret, 21: groove for reinforcing core, 22: reinforcing member, 22A: gutter, 22B: cylindrical part.

Claims (3)

[Claims] 1. A metal reinforcing member embedded in a rod,
A reinforcing core penetrating the reinforcing member, and an adjusting nut screwed to one end of the reinforcing core protruding from the reinforcing member, wherein the reinforcing member has a C-shaped gutter section,
A reinforcing core adjustment structure for a stringed instrument such as an electric guitar, comprising two cylindrical portions integrally connected to both ends of the gutter portion. 2. The reinforcing core adjusting structure for a stringed musical instrument such as an electric guitar according to claim 1, wherein the gutter portion has a length of 50 to 90% of the entire length of the reinforcing member. Reinforcement core adjustment structure. 3. The reinforcing core adjusting structure for a stringed musical instrument such as an electric guitar according to claim 1, wherein the gutter portion and the cylindrical portion are formed by cutting a part of a peripheral surface of a central portion except for both end portions of the pipe. A reinforcing core adjusting structure for a stringed instrument such as an electric guitar, wherein the cut depth of the gutter portion in the pipe radial direction is 30 to 70% of the pipe diameter.