JP2001013957A - Reinforcing device of neck of necked plucked string instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing device for the neck of a necked plucked string instrument which is smaller in the number of parts, is easy in fabrication and assembly, is capable of sufficiently suppressing not only the warpage of the neck by the tension of strings but the torsion of the neck as well and is capable of improving a design characteristic. SOLUTION: The reinforcing device of the neck of the necked plucked string instrument for reinforcing the neck so as to suppress the warpage of the neck 3 by the tension of the strings 4 extended to a fingerboard 9 side mounted on the surface of the neck 3 is symmetrically formed with a long groove 22 at the neck 3 at such a prescribed width as to extend along the longitudinal direction of the neck 3 and between both end parts in a transverse direction. Also, the reinforcing device has a metal reinforcing material 23 which has a transversely long cross-sectional shape symmetrical to the center line having a prescribed width WF larger than the height H, is formed to a long size form and is embedded in the long groove 22 so as to exist along its longitudinal direction and across the transverse direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for reinforcing a neck of a rod-plucked stringed musical instrument, such as a guitar, for reinforcing a neck so as to suppress warpage of a neck (rod) due to string tension.

[0002]

2. Description of the Related Art A string is stretched on the fingerboard side of one side of a neck of a guitar. Especially, in the case of a steel string, the tension is large. Such warpage is likely to occur. For this reason, a straightening device which suppresses the warpage of the neck and corrects the generated warp has been conventionally known.
No. 483.

[0003] In this straightening device, a long groove is formed at the center in the width direction of the neck along the length thereof, and an adjusting rod is provided in the long groove. One end of the long groove is open to the head of the neck. The adjusting rod is made of an iron core (stainless steel alloy) or the like, and is inserted into a channel material having a “b” -shaped cross section. A nut is screwed into the other end protruding from the channel material. The adjusting rod assembled as described above is housed in the long groove with its nut exposed on the head of the neck. Also, rod covers such as buried trees to cover the exposed nuts,
It is fitted and attached to one end of the long groove.

[0004] With the above structure, the adjusting rod has a high rigidity, and thus functions as a reinforcing member for suppressing warpage of the neck due to string tension. If the neck is warped, remove the rod cover, turn the nut with an appropriate tool, and tighten the adjusting rod to reduce the bending moment in the opposite direction to the generated warp through the channel material. In addition, the warpage of the neck is offset and corrected.

[0005]

In the above-mentioned conventional straightening device, a relatively thin adjusting rod and a channel material are provided at the center in the width direction of the neck. For this reason, if these are not properly installed at the center in the width direction of the neck, there is a drawback that the neck is easily twisted around the adjusting rod because the tension of the string is not well-balanced on both sides of the adjusting rod. This is the same when the adjusting rod is tightened to correct the warpage of the neck, and the resistance bending moment does not act evenly in the width direction of the neck in a well-balanced manner. The warpage cannot be properly corrected.

[0006] When the neck is made of wood, the neck has mechanical anisotropy and inhomogeneity due to the distribution, direction and cut of the grain. Even if it is correctly installed in the center of the above, the same problem as described above occurs.

Furthermore, in this conventional straightening device, it is necessary to form a long groove in the neck up to the head, assemble an adjusting rod, a channel material, a nut, and the like in advance, and further attach a rod cover. In addition to the high number of steps, there are disadvantages in that the number of processing and assembling steps is large, and thus the manufacturing cost is increased. Further, since the rod cover is always visible from the outside, it is not preferable in terms of design.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and has a small number of parts, is easy to process and assemble, and has a sufficient torsion of the neck as well as the warpage of the neck due to the tension of the strings. It is an object of the present invention to provide a reinforcement device for a neck of a rod-plucked stringed musical instrument, which can suppress the problem and improve the design.

[0009]

In order to achieve this object, the present invention provides a method for reinforcing a neck so as to suppress warpage of the neck due to the tension of a string attached to a fingerboard attached to the surface of the neck. A device for reinforcing a neck of a stringed plucked musical instrument, wherein a long groove is formed symmetrically in the neck with a predetermined width along the length of the neck and extending between both ends in the width direction, and the height of the groove is larger than the height. A metal reinforcing material which has a horizontally long and symmetrical cross-sectional shape having a large predetermined width, is formed in a long shape, and is embedded in a long groove so as to extend along the length direction and to extend in the width direction. It is characterized by having.

In this reinforcing device, the long groove formed in the neck greatly extends with a predetermined width between both ends in the width direction of the neck, and a metal reinforcing material is inserted into the long groove in the width direction of the long groove. The long groove and the reinforcement are both symmetrically arranged on the neck. In this way, the reinforcing member is arranged so as to extend greatly in the width direction of the neck, so that the reinforcing member not only has a large rigidity against the warpage of the neck, but also has a torsion around the longitudinal direction of the neck. Also, it has high rigidity. Therefore, the warpage of the neck due to the tension of the string can be sufficiently suppressed, and the twist of the neck can also be sufficiently suppressed. Also, since only the reinforcing material embedded in the long groove formed in the neck can sufficiently suppress the warpage of the neck, a conventional straightening device used for the correction, for example, an adjusting rod,
Since a channel material, a rod cover, and the like are not required, the omission thereof can reduce the number of parts, facilitate processing and assembly, and reduce costs.

In this case, it is preferable that the cross-sectional shape of the reinforcing member is a convex shape in which the width on the front surface side of the neck is larger than the width on the back surface side.

In general, the neck of a bar-plucked stringed musical instrument is provided with an R on the back side so that the strings can be easily pressed, and the width of the back side is narrower than the front side on which the fingerboard is attached. Therefore, since the cross-sectional shape of the reinforcing material is as described above, it is close to the cross-sectional shape of the neck, and the reinforcing material is arranged without being unevenly distributed in the cross-section of the neck. It can be suppressed more effectively.

In these cases, it is preferable that the reinforcing member is formed of a press-formed product formed by bending a metal plate by press forming.

According to this configuration, the reinforcing member can be easily and inexpensively formed by press-forming the metal plate. In addition, since high rigidity is secured by bending the metal plate, the weight of the musical instrument can be reduced because of the reinforcing material and thus the musical instrument.

Further, in these cases, the long groove is formed so as to open to the surface of the neck, the reinforcing material is embedded in the long groove with the surface side substantially flush with the long groove, and the long groove and the reinforcing material are connected to the fingerboard. Preferably it is covered by.

In this configuration, since the long groove is formed on the surface of the neck, the processing of the long groove and the embedding of the reinforcing material into the long groove can be easily performed. In addition, since the reinforcing material has a surface side substantially flush with the long groove, it can be used as a supporting member for directly supporting the fingerboard.
Furthermore, since the long groove and the reinforcing material are covered with the fingerboard and do not appear to the outside, a neat appearance is obtained and the design is improved as compared with the conventional straightening device in which the rod cover is always exposed. Can be.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an electric guitar (hereinafter, referred to as “guitar”) to which the present invention is applied. As shown in FIG.
Has a body 2, a neck 3 extending from the body 2, and six strings 4 stretched along the surface of the neck 3. On the surface of the body 2, the first
And second microphones 5, 6, lower piece 7, and tail piece 8
Is provided.

On the other hand, the neck 3 is made of a relatively strong solid wood material such as mahogany or maple, and has a symmetrical “kamaboko” shape with a flat front surface and a rounded back surface. (FIG. 4)
reference). A fingerboard 9 is attached to the surface of the neck 3, and a plurality of frets 10 are embedded on the surface of the fingerboard 9 at predetermined intervals along the length direction of the fingerboard 9. It is the upper piece 11.

The head 12 at the distal end of the neck 3 is provided with six windings 13 including a winding shaft 14 and a winding knob 16. Each string 4 is formed of a single wire or a winding of steel, and is attached between the tailpiece 8 and the winding shaft 14. By rotating the winding shaft 14 by rotating the winding knob 16, the string 4 is attached to the winding shaft 14. It is wound up and stretched with a predetermined tension.

The reinforcing device 21 for the neck 3 according to the present invention comprises:
As shown in FIG. 2 and FIG. 4, it is constituted by a reinforcing member 23 embedded in a long groove 22 formed in the neck 3. The long groove 22 is formed on the surface of the neck 3 so as to extend in the length direction with a length L slightly shorter than the fingerboard 9 over substantially the entire portion of the neck 3 other than the head 12. Also,
As shown in FIG. 4, the long groove 22 has a symmetrical inverted “convex” cross-sectional shape in which the width WF on the front side is larger than the width WB on the back side, and the front side has a neck 3. , And extends largely in the width direction except for the left and right ends. The width WF of the long groove 22 on the surface side is larger than the height H (WF> H).

The reinforcing member 23 is a press-formed product formed by bending a rigid metal plate such as a steel plate by press forming. As shown in FIG. 3 and FIG. 4, the reinforcing member 23 has a symmetrical inverted “convex” cross-sectional shape whose surface side is open and has substantially the same width WF, height H, and length L as the long groove 22. Thereby, the front surface side is flush with the long groove 22 in a state of being flush with the long groove 22. Reference numeral 24 in FIG. 4 denotes a filler fitted to fill the open concave portion of the reinforcing member 23 flush, and is made of a wood material, a synthetic resin, or the like.

Prior to attaching the fingerboard 9 to the neck 3, the reinforcing device 21 having the above-described structure first forms a long groove 22 on the surface of the neck 3 by cutting or the like. And the filler 24 is fitted into the concave portion of the reinforcing member 23 to perform processing and assembly. Then, these long grooves 22, reinforcing members 23
The fingerboard 9 is attached to the surface of the neck 3 so as to completely cover the filler 24, and the strings 4 are stretched.

According to the reinforcing device 21 having the above-described structure, since the reinforcing member 23 is disposed so as to extend greatly in the width direction of the neck 3, the reinforcing member 23 has a large rigidity against the warpage of the neck 3. Not only that, it has high rigidity against torsion around the length direction of the neck 3. Therefore, the warpage of the neck 3 due to the tension of the string 4 can be sufficiently suppressed, and the twist of the neck 3 can also be sufficiently suppressed. In addition, since the reinforcing member 23 has an inverted “convex” cross-sectional shape, the reinforcing member 23 is arranged without being unevenly distributed in the cross section of the neck 3, so that warpage and torsion of the neck 3 are more effectively suppressed. can do.

Further, the warpage of the neck 3 can be sufficiently suppressed only by sequentially fitting the reinforcing material 23 and the filler 24 into the long groove 22 formed in the neck 3, so that it is used for correcting the warpage of the neck 3. In addition, the conventional straightening device, for example, an adjusting rod, a channel material, a rod cover, and the like can be omitted, so that the number of parts can be reduced, machining and assembly can be facilitated, and costs can be reduced. In addition, since the reinforcing member 23 is formed of a press-formed product of a steel plate, the reinforcing member 23 can be formed easily and inexpensively, and a high rigidity can be ensured by bending the reinforcing member 23. Can be achieved.

Further, since the long groove 22 is formed on the surface of the neck 3, the processing of the long groove 22 and the embedding of the reinforcing material 23 can be easily performed. Further, since the reinforcing member 23 and the filler 24 are flush with the long groove 22 on the surface side, the reinforcing member 23 and the filler 24 can be used as a support member for directly supporting the fingerboard 9. Furthermore, since the long groove 22 and the reinforcing member 23 are covered with the fingerboard 9 and do not appear outside,
Compared to a conventional straightening device in which the rod cover is always exposed, a cleaner appearance can be obtained and the design can be improved.

Table 1 below shows the results of a strength test conducted to confirm the warpage suppressing performance of the reinforcing device 21 together with comparative examples. Embodiments 1 to 5 show test results for five necks each incorporating the reinforcing device 21 having the above-described configuration, and Comparative Examples 1 and 2 show the conventional straightening described above having an adjusting rod and a channel material. The test result about two necks incorporating the device is shown.

[0027]

[Table 1]

As shown schematically in FIG. 5, the test method is such that the base end side of the neck 3 is supported in a cantilevered state by a fixture A and the fingerboard end position E (finger) on the opposite side is supported. Board 9
Of the fingerboard end position E so that the deflection δE of the fingerboard end position E becomes a displacement speed of 1 mm / min. The deflection δE of the fingerboard end position E with respect to the part side was automatically measured. At the same time, the deflection δ5F at the 5-fret position mark PM5F (see FIG. 1) of the fingerboard 9 was read by the dial gauge D every 15 seconds. Further, the arrow height δMAX was determined by plot measurement of a graph output by automatic measurement of the load P and the deflection δE.

Here, the arrow height δMAX is the fingerboard butt position F
The maximum deflection of the neck 3 from a straight line connecting the (proximal position of the fingerboard 9) and the fingerboard end position E. The arrow height δMAX is an important index indicating how much the neck 3 is actually warped between the fingerboard butt position F and the fingerboard end position E.
If it is 3 mm or less, it is empirically determined that the performance of the guitar 1 can be satisfactorily performed without any trouble, and the warpage of the neck 3 is within an allowable range and there is no problem.

Table 1 also shows, as representative data of the test results, data obtained when the load P = 2.0 kg and the deflection δE of the fingerboard end position E was 5 mm = 5 mm. This is for the following reason. That is, the total tension of the six strings 4 at the time of regular tuning is about 60 kg, and the inclination of the strings 4 with respect to the neck 3 is determined by the string height (the distance from the surface of the fingerboard 9 to the center of the strings 4). Since it is 0.5 mm for one fret and 1.5 to 2.5 mm for 12 fret, it is 23 'at the maximum. Therefore, the vertical component of the tension of the string 4 in the neck 3, that is, the force acting as a bending on the neck 3 is 60 kg × sin 23 ′ = 0.4
kg and the safety factor is 5, P = 0.4 × 5 =
2.0 kg. That is, the value of the load P is obtained by setting the tension of the string 4 acting as a bend on the neck 3 at the time of regular tuning to a safety factor of 5.
The data when δE = 5 mm is for confirming the state of deflection and strength when the load P is further increased.

In Table 1, first, the test results of Comparative Examples 1 and 2 in which a conventional straightening device is built in, P = 2.
When the weight is 0 kg, the deflection δE of the fingerboard end position E is 1.2
0 to 1.42 mm, 5 fret position mark P
When the deflection δ5F of the M5F is 0.57 to 0.58 mm,
MAX is 0.2-0.3 mm. On the other hand, in the test results of Embodiments 1 to 5, δE = 1.02 to 1.42.
mm, δ5F = 0.26-0.79 mm, δMAX = 0.2
.About.0.3 mm, and a result equivalent to that of the conventional art is obtained.
It was confirmed that it was suppressed to 3 mm or less.

When δE = 5 mm, P = 5.65-6.90 kg and δ5F = 2.0 in Comparative Examples 1 and 2.
6 to 2.29 mm and δMAX = 0.7 to 0.8 mm, whereas in the first to fifth embodiments, P = 5.54 to 10.
00 kg, δ5F = 2.31 to 2.70 mm, δMAX =
0.5 to 0.6 mm is obtained. That is, for the same flexure δE at the fingerboard end position E, in the first to fifth embodiments, the load P is larger and the arrow height δMAX is smaller, so that the neck 3 of the embodiment is more difficult to flex, and warpage is suppressed. It can be seen that the effect is enhanced.

FIGS. 6 and 7 show a second embodiment of the present invention. The reinforcing device 31 according to this embodiment is different from the reinforcing device 21 according to the first embodiment in the configuration of the reinforcing member. That is, this reinforcing material 3
Reference numeral 3 indicates that the reinforcing member 23 of the first embodiment is formed of an elongated solid casting, whereas the reinforcing member 23 is formed of a press-formed product of a metal plate. A plurality of large portions 33a having a planar shape (FIG. 6 is a perspective view as viewed from the back side) and a plurality of small width portions 33b having a smaller width on the front surface side are alternately formed in the length direction. ing. The width of the large portion 33a, the length and the height of the entire reinforcing member 33 are:
This is almost the same as the long groove 22, so that the reinforcing member 33 is fitted in the long groove 22 with the front side flush with the long groove 22, as shown in FIG.

Therefore, according to the reinforcing device 31,
Since the reinforcing member 33 is disposed so as to extend greatly in the width direction of the neck 3, not only the warp but also the twist of the neck 3 due to the tension of the string 4 can be sufficiently suppressed, and the same as in the first embodiment described above. The effect can be obtained. Further, since the reinforcing member 33 is made of a solid cast product and has higher rigidity than the reinforcing member 23 of the first embodiment made of a press-formed metal plate, the warp and twist of the neck 3 are suppressed. The effect can be further enhanced. Furthermore, reinforcement material 3
The solid configuration of 3 makes it possible to omit the filler 24 used in the first embodiment, thereby further reducing the number of parts and the number of assembly steps. In addition, reinforcement material 3
Since the small width portion 33b is formed in 3, the weight can be reduced correspondingly, and a not so heavy reinforcing device can be realized while using a cast product as the reinforcing material 33.

The present invention is not limited to the embodiments described above, but can be implemented in various modes.
For example, in the embodiment, the neck 3 is described as being made of a wood material such as mahogany.
May be made of a synthetic resin such as acryl, and in that case, the above-described effects can be similarly obtained. Also,
The neck of a guitar or the like generally has a taper whose width gradually decreases toward the distal end, and the reinforcing material may be tapered to match this. Furthermore, the embodiment is an example in which the present invention is applied to an electric guitar, but the present invention is not limited to this, and is widely applied to a folk guitar, an electric bass, a banjo, etc., and particularly to a bar-plucked stringed instrument using a steel string. Can be applied. In addition, it is possible to change the detailed configuration within the scope of the present invention.

[0036]

As described in detail above, the neck reinforcing apparatus of the present invention has a small number of parts, is easy to process and assemble, and is not only capable of warping the neck due to the tension of the string, but also of the neck. Has an effect that the torsion can be sufficiently suppressed and the design can be improved.

[Brief description of the drawings]

FIG. 1 is a front view of an electric guitar to which the present invention is applied.

FIG. 2 is a partial side view of the electric guitar of FIG. 1;

FIG. 3 is a perspective view showing a reinforcing member of the reinforcing device according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view of the neck excluding the strings, taken along line IV-IV of FIG. 2;

FIG. 5 is a view schematically showing a method of a neck strength test.

FIG. 6 is a perspective view of a reinforcing member of a reinforcing device according to a second embodiment of the present invention as viewed from the back surface side.

7 is a cross-sectional view of the neck similar to FIG. 4, with the reinforcement of FIG. 6 embedded therein.

[Description of Signs] 1 Electric guitar 3 Neck 4 String 9 Fingerboard 21 Reinforcement device 22 Long groove 23 Reinforcement material 31 Reinforcement device 33 Reinforcement material WF Long groove and width of reinforcement material

Claims (4)

[Claims] An apparatus for reinforcing a neck of a roded plucked musical instrument for reinforcing the neck so as to suppress warpage of the neck due to the tension of a string attached to a fingerboard attached to the surface of the neck, A long groove is formed in the neck symmetrically with a predetermined width along the length direction of the neck and extending between both end portions in the width direction, and a horizontally long bilateral symmetry having a predetermined width larger than the height. Characterized in that the elongated groove is provided with a metal reinforcing material embedded in the elongated groove so as to extend along the length direction and to extend in the width direction. Neck reinforcement device for plucked instruments. 2. The repellent rod according to claim 1, wherein the cross-sectional shape of the reinforcing material is a convex shape in which the width of the front surface side of the neck is larger than the width of the back surface side thereof. String instrument neck reinforcement. 3. The neck of a bar-plucked stringed musical instrument according to claim 1, wherein the reinforcing member is formed by a press-formed product formed by bending a metal plate by press-forming. Reinforcement device. 4. The long groove is formed so as to open to the surface of the neck, and the reinforcing material is embedded in the long groove with a surface side substantially flush with the long groove, and the long groove and the reinforcing material are provided. 4. The neck reinforcing device for a roded plucked musical instrument according to claim 1, wherein the finger is covered by the fingerboard.