JP2017203824A - Bridge pin pull-out tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pull-out tool capable of easily and rapidly pulling out a bridge pin P without centralizing the pull-out force to a stringed instrument so as not to damage the stringed instrument, when the bridge pin P is pulled out.SOLUTION: A bridge pin pull-out tool 1 includes a flexible string-like portion 10, and a body 20 fixed to both ends of the string-like portion 10. The string-like portion 10 forms a first loop LP1 together with the body 20. The first loop LP1 is constituted so that its inner peripheral length is longer than the maximum peripheral length of a head Pa.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a puller for a bridge pin for fixing a string of a stringed instrument such as an acoustic guitar.

  Generally, a stringed instrument produces a timbre by enlarging the vibration of a stretched string using its body (torso) and soundboard. For example, there are various guitars, violins, cellos, kotos, and the like.

The bridge pin is used to fix a string in a stretched state to a stringed instrument in a bridge (frame). Many of them are inserted into a stringed instrument body together with strings and fixed (Patent Document 1).
However, the strings are tensioned and are struck and vibrated, so they wear out and may break during performance. In such a case, it is necessary to pull out the bridge pin and replace the string. On the other hand, since the bridge pin is in a state of fitting with the stringed instrument main body with such a strength that it cannot be pulled out against the tension of the string, it cannot be easily pulled out even by pinching the head with bare hands.
Therefore, conventionally, a dedicated drawing tool such as a plastic is often used.

Such a conventional bridge pin puller T ′ will be described with reference to FIGS. Both figures show examples of their use.
First, a description will be given of a fitting state of the bridge pin. As shown in FIG. 6A, the bridge pin P ′ is a bridge pin that penetrates the front plate Gt ′ and the bridge back plate Bb ′ in close contact with the bridge B ′. The insertion hole Bh 'is inserted and fitted together with the string Gs' and fixed. The bridge pin P ′ is composed of a wedge-shaped tapered body part Pc ′ and a spherical head part Pa ′ for pulling out via a neck part Pb ′. In order to fix the string Gs ′ to the stringed instrument so that the string Gs ′ does not come out, after inserting the string Gs ′ with the end ball Be ′ into the insertion hole Bh ′, the bridge pin P ′ is fitted into the insertion hole Bh ′.
The conventional bridge pin puller T ′ for pulling out the bridge pin P ′ in such a fitting state is larger than the diameter of the neck portion Pb ′ of the bridge pin as shown in FIGS. 6 (a) and 6 (b), for example. Is provided with a drawing portion T1 ′ having a U-shaped opening smaller than the diameter of the head Pa ′ (FIG. 6 shows a sectional state by hatching), as shown in FIG. Insert this opening into the pin neck Pb ', use the pin head Pa' as the action point and the lower part of this extraction part as the fulcrum S ', and pull out the nail by the "lever principle". I was pulling out.
However, the bridge pin puller T ′ employing such “lever principle” has its fulcrum S ′ on the surface of the stringed instrument such as the bridge B ′ or, in some cases, the front plate Gt ′. Accordingly, the pulling force concentrates on the dynamic fulcrum S ′. For this reason, it is inevitable that the conventional bridge pin extracting tool T ′ contacts the surface of the stringed instrument with a strong force, and the stringed instrument may be damaged during the extraction.

Also, it is impossible for specialists such as repairers to pull out the head Pa 'of the bridge pin P' while holding it with a pliers used for maintenance of the stringed instrument without using a dedicated puller. It wasn't.
However, in such a case, if the metal part of the tip of the pliers mistakenly contacts the stringed instrument, the stringed instrument may be damaged, and the risk of damaging the instrument may be further increased than the above-described dedicated bridge pin puller T ′. was there. In particular, many stringed instruments such as acoustic guitars are expensive and highly decorative, and their performers, owners, and repairers perform maintenance operations that damage the instrument when pulling out the bridge pin P '. I often wanted to avoid.

On the other hand, it is not easy to pull out the bridge pin simply and quickly without taking a fulcrum to avoid damaging the instrument because it requires a fundamental change from the lever principle. For this reason, a bridge structure that can exchange strings without using a bridge pin has been proposed (Patent Document 2).
However, the current situation is that many strings are still fixed using bridge pins because they change the traditional appearance.

  From such a background, a bridge pin puller that pulls out a bridge pin simply and quickly while reducing the risk of damaging the instrument has been desired.

Registered Utility Model No. 3166970 JP 2001-142455 A

  The present invention has been made in view of such a conventional situation, and an object thereof is to concentrate the pulling force on the stringed instrument so that the stringed instrument is not damaged when the bridge pin is pulled out. In addition, it is an object of the present invention to provide a bridge pin puller that can easily and quickly pull out the bridge pin.

<1>
A bridge pin puller for pulling out a bridge pin having a head, a neck narrower than the head following this, and a trunk extending from the neck from the bridge of the stringed instrument,
Having a flexible string-like part and a main body to which both ends of the string-like part are fixed;
The string portion forms a first loop together with the main body,
The first loop is characterized in that the inner circumference is longer than the maximum circumference of the head.
As a result, the first loop can be wound around the neck of the bridge pin, and when pulling out, the pulling tool pulls out the bridge pin by simple means without concentrating the pulling force on the surface of the guitar. Can be provided.

<2>
The second loop formed around the neck when the first loop is wrapped around the neck through the head of the pin to form two partial loops is the length of the inner circumference. It is preferable that the length is longer than the minimum perimeter of the neck and shorter than the maximum perimeter of the head.
Accordingly, it is possible to provide a bridge pin puller that pulls out a bridge pin by a simple means without reliably concentrating the pulling force on the surface of the guitar when pulling out reliably regardless of the size of the bridge pin. it can.

<3>
The string-like part is preferably made of a synthetic resin.
Thereby, even when a string-like part touches a musical instrument, it is avoided that a musical instrument is damaged.

<4>
The present invention includes a step of immersing the first loop in the head of the bridge pin and hanging it on the neck, and rotating the body to twist the first loop to form the second loop around the neck. And a step of rotating the main body until the inner circumference of the second loop becomes shorter than the maximum circumference of the head, and a step of pulling out the main body and pulling out the bridge pin. .
Thereby, the usage method of the bridge pin extraction tool which pulls out a bridge pin reliably can be provided.

<5>
The step of rotating the main body is preferably a step of rotating the main body halfway.
Thereby, the usage method of the bridge pin extraction tool which pulls out a bridge pin simply and quickly can be provided.

  Since the present invention is configured as described above, the bridge pin can be easily pulled out without concentrating the pulling force on the surface of the guitar. Therefore, when the bridge pin is pulled out, it can be pulled out without damaging the guitar.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

(guitar)
As shown in FIG. 5A, the acoustic guitar G includes a plurality of strings Gs between a nut (not shown) attached to the upper end of the guitar neck Gn and a saddle Bs of a bridge B provided on the body Gb. Is stretched across the sound hole Gh.

  In this acoustic guitar G, the vibration of the string generated by holding the fret Gf and playing the string Gs with a pick or the like is transmitted to the thin and elastic hollow body Gb, and the air in the string Gs resonates with it. A beautiful sound comes out from the sound hole Gh. A pick guard Gp is provided so that the guitar G is not damaged by the operation of the pick.

As shown in FIG. 5B, the bridge pin P used in the acoustic guitar G is fitted to the bridge B to fix the string Gs to the bridge B. The bridge B is attached to the guitar G in close contact with the front plate Gt, and the bridge pin P is supported by the saddle Bs in an insertion hole Bh of the bridge pin that penetrates the bridge B, the bridge front plate Gt, and the bridge back plate Bb. Used together with one end of the string Gs.
In order to fix the string Gs, after inserting the string Gs with the end ball Be into the insertion hole Bh, the bridge pin P is fitted into the insertion hole Bh to hold the string Gs connected to the end ball Be. The bridge pin P is formed to have a tapered shape so that the bridge pin P does not easily come out of the insertion hole Bh, and this is pushed into the insertion hole Bh and fitted.

  On the other hand, the other end of the string Gs is wound up by a tuning key (not shown) of the guitar head, so that the string Gs has a constant tension between the saddle Bs of the bridge B and the nut (not shown) of the guitar head. Given, tuned and used for performance.

(Bridge pin)
As shown in an enlarged view in FIG. 7, the bridge pin P usually has a head portion Pa, a head portion Pa, a neck portion Pb narrower than the head portion Pa, and a tapered body portion Pc extending from the neck portion Pb. Is formed. By fitting the tapered body portion Pc into the insertion hole Bh, the static frictional force resists the tension of the string Gs. As shown in FIG. 7, the bridge pin P is easily pulled out by making the head Pa thicker than the neck Pb.

  Further, a groove Pg through which the string Gs passes from the neck portion Pb of the bridge pin P to the trunk portion Pc may be cut. The string Gs passes through the groove Pg and penetrates to the bridge back plate Bb inside the sound hole Gh, and is connected to the end ball Be formed larger than the groove Pg. This structure serves as a stopper to prevent the string Gs from coming off.

Furthermore, since the head Pa of the bridge pin P is an accent in the decoration of the guitar,
In consideration of the fixing and pulling of the bridge pin P and the decorativeness of the guitar, there is a case of a hemispherical head. In addition to shapes, there are various colors.
The bridge pin P may be made of wood or plastic (made of synthetic resin).

  The bridge pin P thus functions as a stopper for the string Gs. However, when the string Gs is cut or worn out, it is necessary to pull out the bridge pin P in order to replace the string Gs. At this time, the drawing tool of the present invention is used.

(First embodiment)
FIG. 1 shows a bridge pin puller 1 according to the first embodiment.
As shown in FIG. 1, the bridge pin puller 1 according to the first embodiment includes a string 10 and a main body 20 to which both ends of the string are fixed. As shown in FIG. 2, the bridge pin pulling tool 1 is inserted into the main body 10 while the string 10 is inserted into the connection holes 21 of the main body 20 to form the first loop LP1 that is a closed loop. The string 10 is assembled by being fastened with a fixing member such as a screw 23 from a fixing hole 22 opened from another direction orthogonal to 90 °.

  The main body 20 has a through-hole 15 in the center thereof so that it can be easily grasped with a fingertip, has a substantially donut-like shape, and a convex portion in which a portion of the main body 20 extends smoothly outward. 20a is provided, and a connecting portion 20b connected to the string-like portion 10 is provided at a location facing the outside of the main body 20 of the convex portion 20a. The connecting portion 20b is configured as an oval cross-section that is cut off on a plane parallel to the central axis of the through hole 15 of the main body 20, and a well-like connection hole that does not pass through for inserting and fixing the string 10 Two of 21 and 21 are provided side by side at substantially symmetrical positions with respect to a plane including the central axis of the through hole 15 of the main body 20.

The shape of the main body 20 is not limited to a donut shape, and may be a bill shape so that it can be easily gripped with a palm. The material may also be made of metal such as aluminum, and may be made of wood or plastic.
In this way, the main body 20 is configured to be gripped in order to pull out the bridge pin P with a human finger or hand.

  The convex portion 20a of the main body 20 has a connection hole 21 and fixing holes 22 and 22 for fixing the string 10 perpendicularly to the connection hole 21 from the symmetrical positions of the side surfaces of the main body 20, respectively. The holes 21 and 21 are provided so as to penetrate. The inside of the fixing holes 22 and 22 is internally threaded. After the string 10 is inserted through the connection holes 21 and 21 to the end of the fixing holes 22 and 22, so-called potato screws (set screws) 23 and 23 are fixed. By screwing into the holes 22, 22, the string-like portion 10 is pressed using the female screw as the fixing members 23, 23, and is detachably fixed.

  The string 10 as the string-like portion may be made of synthetic resin such as nylon as long as it is flexible. Moreover, the thing which has a metal wire in the core may be used. The thickness may be appropriately determined depending on the size of the pin to be pulled out and the shape of the neck. In order to pull the bridge pin P by twisting the string 10 and pulling the string 10 to the neck part Pa of the bridge pin P, the length of the string is the maximum diameter D1 of the head Pa and the maximum diameter of the neck part as described later. It is desirable that it is not more than + 30% of the difference in the small diameter D2, and it is desirable that it be the same or less.

  The string 10 is connected and fixed by inserting both ends thereof into connection holes 21 and 21 of the main body. For this reason, the string 10 forms the first loop LP <b> 1 together with the main body 20. The inner diameter of the first loop LP1 is configured such that its length is longer than the maximum peripheral length S1 of the head Pa so that the head Pa of the bridge pin P can be passed. If the head Pa of the bridge pin P can be passed, the neck Pb of the bridge pin P is thinner than the head Pa, so that the first loop LP1 can be hung on the neck Pb.

(Second Embodiment)
FIG. 8 shows a bridge pin puller 100 according to the second embodiment. The difference from the first embodiment is the shape of the main body 120, and the difference will be mainly described.
As shown in FIG. 8, the bridge pin puller 100 according to the second embodiment includes a string 110 and a main body 120 to which both ends of the string are fixed. In this bridge pin puller 100, the string 110 is inserted at both ends into two connection holes 121, 121 of the main body 120 to form a first loop LP101 which is a closed loop, and the string 110 inserted into the main body 110 is It is assembled using an adhesive or the like.

  As shown in FIG. 8, the main body 120 has a flat rectangular parallelepiped shape so that it can be easily gripped by the palm of the hand, and a convex portion 120a is provided with a part of the main body 120 smoothly extending outward to be convex. In addition, a connecting portion 120b connected to the string-like portion 110 is provided at a location facing the outside of the main body 120 of the convex portion 120a. The connecting portion 120b is configured to have a curved surface with a gently concave shape at both corners of a cross-section that is cut off by a plane parallel to an axial cross-section of the rectangular parallelepiped shape of the main body 120, and is fixed by inserting the string 110. Two well-shaped connection holes 121, 121 that do not penetrate are provided side by side at substantially symmetrical positions with respect to the plane including the central axis of the main body 120.

The material of the main body 120 may also be made of metal such as aluminum, and may be made of wood or plastic.
In this manner, the main body 120 is configured to be gripped for pulling out the bridge pin P with a human finger or hand.
The string 110 as the string-like portion is the same as that in the first embodiment.

(Example of use)
With reference to FIG. 3 and FIG. 4, the pulling operation for pulling out the bridge pin P using the pulling tools 1 and 101 of the first embodiment and the second embodiment will be described. In addition, since the extraction operation of 1st Embodiment and 2nd Embodiment is common, the extraction operation | movement of 1st Embodiment is demonstrated and the extraction operation | movement of 2nd Embodiment is omitted.

First, the pulling tool 1 is grasped, and as shown in FIG. 4A, the head portion Pa of the bridge pin P is submerged (passed) in the first loop LP1 and hung on the neck portion Pb. At this time, for the sake of convenience, the connection hole 21 on the upper side of the paper is denoted by h1, and the connection hole 21 on the lower side of the paper is denoted by h2.
Next, the drawing tool 1 is rotated by 180 ° so that the connection hole 121 of h1 is in front of the page and the connection hole of h2 is on the back side of the page.
Then, as shown in FIG. 4B, the connection hole 21 on the upper side of the paper becomes h2, the connection hole 21 on the lower side of the paper becomes h1, and the string 10 is twisted to form the intersection C of the string 10. The first loop LP1 hung on the neck portion Pb is divided into two small partial loops including a second loop LP2 in which a pin is hidden and a loop on the main body 20 side. That is, by twisting, the first loop LP1 forms a second loop LP2 that is a small partial loop with the intersection C as a boundary.

At this time, as shown in FIG. 4B, the main body 20 is rotated until the intersection point C enters from the position of the maximum peripheral length S1 of the head Pa of the bridge pin P in a plan view. Then, the second loop LP2 can be wound around the neck portion Pb so as to be smaller than the maximum peripheral length S1 of the head portion Pa of the bridge pin P. In this state, the main body 20, that is, the extraction tool 1 is pulled out. Even if it is pulled, the string portion 10 cannot pass through the head Pa.
Therefore, when the main body 20 is pulled in the direction in which the bridge pin P is pulled out in this state, the bridge pin B is pulled out after the fitting of the insertion hole Bh is released.

  Further, if the second loop LP2 is configured such that the inner circumferential length is longer than the minimum circumferential length S2 of the neck portion Pb and shorter than the maximum circumferential length S1 of the head Pa, the main body 20 is rotated halfway. In other words, that is, when the main body 20 is twisted by 180 °, an intersection point C is formed, and the intersection point C can enter inside the portion of the maximum peripheral length S1 of the head Pa of the bridge pin P. Then, if the main body 20 is pulled in the direction in which the bridge pin P is pulled out in this state, the string 10 cannot pass through the head Pa, and the bridge pin P is pulled out after the fitting of the insertion hole Bh is released.

When arranged, the step of immersing the first loop LP1 in the head Pa of the bridge pin and hooking it on the neck Pb, and rotating the main body 20 of the extraction tool 1 to twist the first loop LP1, Forming a second loop LP2 around the circumference, rotating the main body 20 until the inner circumference of the second loop LP2 is shorter than the maximum circumference of the head Pa, and pulling the main body to form the bridge A method of using the bridge pin puller 1 including the steps of pulling out the pins has been shown.
The same applies to the extraction tool 100.

<Test Example 1>
A pull-out test of a commercially available bridge pin P was performed using the bridge pin pull-out tools 1 and 101 of this example. The specifications of the bridge pin P are shown in the table. here,
D1 is the maximum diameter of the head Pa of the bridge pin P,
D2 is the minimum diameter of the neck Pb,
D3 is the string diameter.

When such a bridge pin P was extracted with the extraction tool of this example, the following results were obtained. Here, each variable means an interval as shown in FIG. That is,
D2 is the maximum perimeter of the neck Pb,
L1 is the distance from the center axis of the pin to the insertion hole of the main body,
Pi1 is the distance between the central axes of the insertion holes,
The number of twists was the angle at which the main body was twisted (one at 180 °).
θ is an angle away from the parallel direction of the place where the string 10 is separated from the pin when twisted by 180 °,
L2 is the distance from the central axis of the pin to the intersection C at this time,
WL is the length of the string at this time.

  As described above, when the distance between the insertion holes is the same as that when the neck Pb is wound, if the length of the string is changed from 14.4 mm to 27.9 mm, the rotation is 180 ° (the number of twists). 1 time), the string could be suitably pulled out.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to above-described embodiment.

  The bridge pin puller of the present invention can be used in the field of stringed instruments having a bridge.

It is a perspective view of a 1st embodiment of a bridge pin extraction tool of the present invention. It is an assembly drawing of a 1st embodiment. It is a conceptual diagram which shows the space | interval of each place at the time of hanging a string on the neck part Pb of the bridge pin P and rotating a main body by 180 degrees. It is a figure which shows the usage example of the extraction tool of 1st Embodiment. It is explanatory drawing of a guitar and a bridge. It is a figure which shows the usage example of the drawing tool of a prior art example. It is explanatory drawing of the bridge pin P. FIG. It is a perspective view of 2nd Embodiment of the bridge pin extraction tool of this invention.

1, 100 Bridge pin puller 10, 110 String-like part (string)
15 Through-holes 20 and 120 Main bodies 20a and 120a Convex parts 20b and 120b Connection parts 21 and 121 Connection hole 22 Fixing hole 23 Fixing member (fastening screw)
LP1, LP101 First loop LP2 Second loop G Guitar Gb Body Gf Fret Gh Sound hole Gn Neck Gp Pickguard Gs String Gt Front plate B Bridge Bb Bridge back plate Be End ball Bh Insert hole Bs Saddle P Bridge pin Pa Head Pb neck part Pc trunk part Pg groove S fulcrum T 'conventional pulling tool C intersection point of string-like parts 10 and 110 when the main bodies 20 and 120 are twisted D1 maximum diameter D2 of head Pa Pa minimum diameter D3 of neck part Pb Diameter L1 Distance between the center axis of the pin and the insertion hole of the main body L2 Distance between the center axes of the distance insertion holes from the center axis of the pin to the intersection C at this time S1 Maximum perimeter length S2 of the head Pa Pa of the neck Pb Angle Pi1 in each of the insertion holes when the string 10 is twisted 180 ° when it is twisted. Interval of the axes

Claims (5)

A bridge pin puller for pulling out a bridge pin having a head, a neck narrower than the head following this, and a trunk extending from the neck from the bridge of the stringed instrument,
A flexible string-like part and a main body to which both ends of the string-like part are fixed;
The string-like portion forms a first loop together with the main body,
The first loop is a bridge pin puller configured such that the inner circumference thereof is longer than the maximum circumference of the head.   The second loop that is formed around the neck when the first loop is wrapped around the neck through the head to form two partial loops has an inner circumference length of The bridge pin puller according to claim 1, wherein the bridge pin puller is configured to be longer than a minimum perimeter of the neck and shorter than a maximum perimeter of the head.   The bridge pin puller according to claim 1 or 2, wherein the string portion is made of a synthetic resin. Immersing the first loop in the head of the bridge pin and hanging it around the neck;
Rotating the body to twist the first loop to form a second loop around the neck;
Rotating the main body until the inner circumference of the second loop is shorter than the maximum circumference of the head;
The method of using the bridge pin puller according to claim 1, comprising: pulling the main body to pull out the bridge pin.   The method of using the bridge pin puller according to claim 4, wherein the step of rotating the main body is a step of rotating the main body halfway.

Images