KR100661987B1 - Shaft for golf club and manufacturing method of the same - Google Patents

Abstract

A shaft for golf club with multi-layered structure of an innermost layer, elastic material around the innermost layer and an outer fiber layer is provided to increase elastic force and restoration force of the shaft, to correctly strike ball, and to enhance flight distance. The shaft comprises: first layer(1) made of carbon fiber that is located at innermost part; an elastic material(3) that is formed in length direction around outer side of the first layer; and second layer(5) that encloses the first layer(1) and the elastic material(3). The shaft further has third layer(7) around outer side of the second layer(5). Additionally, the shaft further includes a contractive film layer(9) made of film material contracting by heat such as PE tape that envelops the third layer(7). The elastic material comprises elastic carbon or metal material containing steel or titanium as a major element.

Description

Shaft for golf club and its manufacturing method {Shaft for golf club and manufacturing method of the same}

1 is a partial cross-sectional view showing a shaft for explaining the first embodiment according to the present invention.

FIG. 2 is a cross-sectional view of the A-A section of FIG. 1;

3 is a perspective view for explaining a process of manufacturing a shaft according to the present invention.

4 is a flowchart illustrating a manufacturing process of the first embodiment according to the present invention.

5 is a view for explaining the operation and effect of the first embodiment of the present invention.

6 is a cross-sectional view of the shaft cut at right angles to the longitudinal direction to explain the second embodiment according to the present invention.

7 is a flowchart illustrating a manufacturing process of a shaft according to a second embodiment according to the present invention.

8 is a cross-sectional view of the shaft cut at right angles to the longitudinal direction in order to explain the third embodiment of the present invention.

9 is a flowchart illustrating a third embodiment according to the present invention.

10, 11, 12, 13, and 14 are manufactured to describe the fourth, fifth, sixth, seventh, and eighth embodiments of the present invention. It is a cross section which cuts the shaft in process orthogonal to an axial direction.

15 is a perspective view of a shaft for describing a ninth embodiment according to the present invention.

16 is a cross-sectional view taken along the line B-B of FIG. 15.

17 is a view for explaining a process of manufacturing a shaft according to a ninth embodiment of the present invention.

18 is a perspective view illustrating a process following FIG. 17 as a process of manufacturing a shaft according to a ninth embodiment of the present invention.

19 is a cross-sectional view taken along the line C-C in FIG. 18.

20 is a perspective view illustrating a process following FIG. 18 as a process of manufacturing a shaft according to a ninth embodiment of the present invention.

FIG. 21 is a cross-sectional view taken along the line D-D of FIG. 20.

22 is a flowchart illustrating a process of manufacturing the shaft of the present invention.

23, 24, 25, 26, 27, 28, 29, 30, and 31 are the tenth, eleventh, thirteenth, and fourteenth embodiments of the present invention. For example, to illustrate the fifteenth, sixteenth, seventeenth, and eighteenth embodiments, the shafts are cross-sectional views taken perpendicular to the longitudinal direction.

The present invention relates to a shaft of a golf club, and more particularly, a golf club shaft and a method for manufacturing the golf club shaft which can increase the distance of the golf ball as well as hitting the ball accurately by increasing the elastic force and the restoring force of the shaft. It is about.

In general, a golf club may be composed of a head that is a part of the ball (impact), a shaft coupled to the head, and a handle. The golf shaft is ultra-light and has sufficient strength and elasticity, and a carbon shaft made of a carbon fiber material is widely used. Normally, the role of the shaft ensures that the energy generated during the swing is transferred to the ball as much as possible, and the feel of the shot that occurs when the head and ball are impacted is transmitted to the golfer. The shaft is capable of moving at speeds of more than 150 kilometers per hour in one second from the back swing to the down swing, and is known to exhibit great stress and torque in this process. That is, the head is ahead of the shaft due to the acceleration of the downswing immediately before the impact. At the moment of impact, the head is retracted by the collision with the ball and the shaft is bent back and forth.

Conventional carbon shafts have a problem in that when the downswing and the head collide with the ball, the torsion is severe, and it is difficult to hit the ball accurately in the desired direction, and the restoring force of the torsion is lost at the moment of impact, which limits the flying distance. There is this.

In addition, a general carbon shaft can be manufactured to form a number of layers by winding multiple layers of carbon fiber fabric to reduce the bending and torsion and increase rigidity, in which case the weight is increased and the feel can be bad.

Therefore, the present invention has been proposed to solve the above problems, an object of the present invention is to provide a golf club shaft that can allow the ball to fly in the desired direction by hitting the golf ball accurately with less bending and torsion have.

In addition, the present invention is to provide a golf club shaft that can increase the distance by making a precise hit by improving the restoring force the moment the head is impacted on the ball.

In addition, the present invention is to provide a golf club shaft that can increase the life.

In order to achieve the above object, the present invention provides a first layer portion provided with at least one groove portion and a protrusion in the longitudinal direction, at least one elastic member disposed in the groove portion provided in the first layer portion, and the first layer portion and the elastic member A golf club shaft is provided that includes a wrapping second layer portion.

The first layer portion may be formed by layering one or two or more layers of carbon fiber fabric.

The elastic member may be made of any one of carbon or metal having elastic properties.

When the elastic member is made of metal, it is preferable that the elastic member is made of steel or titanium.

Preferably, the second layer portion is formed by forming one or two or more layers of carbon fiber fabrics to form a layer.

It is preferable that the shrink film is bonded to the outer circumferential surface of the layer disposed on the outermost side in the second layer portion.

The second layer portion may protrude by a predetermined length from the center to the outer circumferential surface of the portion where the elastic member is disposed compared to the portion where the elastic member is not disposed.

The elastic member may have a cylindrical shape and at least one elastic member may have a thickness different from that of the remaining elastic members.

In another aspect, the present invention, the first layer portion made of carbon and disposed on the innermost side, at least one elastic member disposed in the longitudinal direction on the outer peripheral surface of the first layer portion, and is arranged to surround the first layer portion and the elastic member and carbon It provides a golf club shaft comprising a second layer portion made of.

It is preferable that a cut sheet layer is provided on the outer surface of the elastic member.

The filler sheet layer is preferably made of a carbon material.

In another aspect, the present invention, the step of winding the first layer portion in a mold provided with at least one groove portion in the longitudinal direction, after the step of winding the first layer portion arranging the elastic member having a predetermined length on the groove side side, the elastic member is disposed And then winding a second layer portion on the outer circumferential surface of the elastic member and the first layer portion, shaping after winding the second layer portion, and removing a mold after the forming step. Provides a method of making.

The method may further include winding a third layer portion on the outer circumferential surface of the second layer portion after winding the second layer portion.

After the step of winding the second layer portion may further comprise the step of winding a shrink film on its outer peripheral surface.

In addition, the present invention is a step of winding the first layer portion in the mold, after the step of winding the first layer portion, the elastic member having a predetermined length on the outer peripheral surface of the first layer portion, the elastic member after placing the elastic member Arranging the wrap sheet fabric on the outer side of the fabric; winding the second layer portion on the outer circumferential surface of the first layer portion after arranging the wrap sheet fabric; molding after winding the second layer portion, and forming It provides a method for manufacturing a shaft for a golf club comprising the step of removing the mold after the step.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a partial cross-sectional view for explaining a first embodiment according to the present invention, which shows a shaft for a golf club. The golf club shaft of the present invention is a carbon shaft, the innermost layer of the first layer portion (1) made of carbon fibers, the elastic member (3) disposed in the longitudinal direction on the outer peripheral surface of the first layer portion (1), the The first layer part 1 and the second layer part 5 which forms another layer while surrounding the elastic member 3 are included. A third layer portion 7 may be disposed on the outer circumference of the second layer portion 5.

The first layer portion 1 is provided with a plurality of groove portions 1a (shown as one example in FIGS. 1 and 2) formed in the longitudinal direction. And the opposite side (the center side direction of the shaft) of the said groove part 1a consists of the protrusion part 1b (shown in FIG. 2) which protrudes toward the center along the longitudinal direction. The first layer portion 1 is preferably made of a hardened carbon fiber fabric. The first layer part 1 may be disposed at the innermost side of the shaft, and may be formed of one layer, or may be formed of a plurality of layers. The elastic members 3 having a predetermined length are disposed in the groove portion 1a of the first layer portion 1.

The elastic members 3 may be made of a generally thin and long cylindrical shape, and a carbon material such as a material forming the first layer part 1 may be used. That is, the elastic member 3 can be used as a carbon fiber material having high elasticity and ductility. In addition, the elastic member 3 may be made of a material having high elasticity and ductility, that is, a material mainly composed of steel or titanium, or aluminum. In addition, the elastic member 3 may use a glass fiber having elasticity and ductility as a material. The elastic members 3 may be arranged in one or a plurality, and in the case of a plurality of the elastic members 3, the elastic members 3 may be disposed at equal intervals.

In addition, the second layer portion 5 is disposed to surround the outer circumferential surface of the first layer portion 1 and the elastic member 3. The second layer portion 5 may be made of a carbon fiber fabric wound and cured by heat. In the first embodiment of the present invention, it is preferable that the cross section of the second layer portion 5 is circular. In addition, the second layer part 5 may be formed of one or two or more carbon layers. That is, the third layer portion 7 may be disposed on the outer circumferential surface of the second layer portion 5 with the same material as the second layer portion 5.

The elastic member 3 may be disposed in the entire region of the length of the shaft, it may be disposed only in a portion of the section. Since the elastic member 3 is made of a material having excellent elasticity and restoring force, the elastic member 3 has an excellent restoring force at the time of swinging so that accurate hitting can be performed and the flying distance can be increased. In addition, the role of reinforcing the shaft can extend the life of the shaft.

Referring to the method for producing a carbon shaft of the present invention in detail as follows.

Figure 3 is a perspective view showing the shape of the mold and the shape of the elastic member for producing a shaft of the present invention, Figure 4 is a flow chart for explaining a method for producing a carbon shaft of the present invention. First, a carbon fiber fabric cut in a desired shape is wound around a mold M provided with three grooves g in the longitudinal direction to make the first layer part 1 disposed at the innermost side (S1). At this time, the carbon fiber fabric is made of three grooves (g) in the longitudinal direction according to the shape of the mold (M). The elastic members 3 are disposed on the outer circumferential surface of the first layer part 1 of the portion where the groove part g is made (S3). Further, the elastic member 3 and the first layer portion 1 are simultaneously wound with another carbon fiber fabric to form the second layer portion 5 (S5). At this time, the second layer portion 5 is preferably made to have a circular cross section. Subsequently, the second layer portion 5 winds another carbon fiber fabric on its outer peripheral surface to form the third layer portion 7 (S7). This third layer portion 7 can be omitted as necessary in design. Then, as described above, the carbon fiber fabric is wound, and a mold including the elastic members is put into a heating furnace and heated to form (S9). At this time, the shaft is made while curing the epoxy contained in the carbon fiber fabric by heat. And the molded shaft is separated from the mold and the shaft by using a separate de-core machine (S11). The mold may be provided with a locking portion (h) at the front end portion so that the shaft can be easily separated using a de-mold machine.

The effect of the shaft of the golf club manufactured as described above will be described in detail with reference to FIG. 5.

FIG. 5 illustrates a golfer's down swing process and impact moment, where p1 is the down swing moment and p2 is the degree of bending of the shaft at the impact moment of the head H and the ball B. FIG. And the symbol kp is a kick point (kick-point, or inflection point) of the conventional shaft, but may be composed of three points at a certain distance, but in FIG. That is, the shaft may be bent at an angle of a with respect to the kick point kp at the point p1 due to the acceleration during the downswing. However, due to the restoring force of the elastic members 3 of the present invention and the restoring force acting by the groove part 1a and the protrusion part 1b of the first layer part 1, the angle a bent gradually decreases and eventually the head H and the ball B At the moment of impact, the bending angle a of the shaft is significantly smaller, which allows for accurate hitting of the ball. Therefore, the golfer can not only blow the ball constantly in the desired direction by always hitting the ball accurately, but also the bending angle (a) of the shaft is remarkably reduced, so-called snap effect occurs, thereby improving the flying distance. In addition, by reducing the impact that can be transmitted to the shoulder of the golfer by the elastic force of the elastic member it is possible to reduce the fatigue and to prevent the injury. In addition, since the elastic member 3 serves to reinforce the shaft, it is possible to increase the durability of the shaft.

FIG. 6 is a view showing another example of FIG. 2 to describe a second embodiment according to the present invention, and FIG. 7 is a flowchart illustrating a method of making a golf club shaft as a second embodiment of the present invention. The second embodiment of the present invention describes only the differences from the above-described first embodiment, and replaces with the description of the first embodiment described above with the same configuration, manufacturing method, and effects as the first embodiment.

According to the second embodiment of the present invention, the shrinkage film is wound around the outer circumferential surface of the third layer portion 7 which is disposed at the outermost side as compared with the first embodiment (indicated by S8 in FIG. 7). A shrink film layer 9 (shown in FIG. 6) is disposed to maintain a desired shape. The shrink film layer 9 may be formed of a film having a property of shrinking by heat such as PE tape.

The second embodiment of the present invention can increase the quality of the product by maintaining the shape and shape of the carbon fiber fabric in the process of forming the shrink film wound on the outermost side of the carbon fiber fabric forming the shaft. The second embodiment of the present invention is different from the first embodiment in that the shrink film layer 9 is disposed on the outer circumferential surface of the shaft, and other parts are the same as in the first embodiment, and thus the repeated description will be repeated. It replaces with description of an Example.

8 is a cross-sectional view cut perpendicularly to the longitudinal direction of the shaft in order to explain the third embodiment according to the present invention, and FIG. 9 is a flowchart illustrating a method of making a shaft for a golf club in the third embodiment of the present invention. . The third embodiment of the present invention describes only the differences from the above-described first embodiment, and replaces with the description of the first embodiment described above with the same configuration, manufacturing method, and effects as the first embodiment.

In the above-described first embodiment, an example in which the elastic member 3 is disposed in the groove portion 1a on the outer surface side of the first layer portion 1 has been described, but in the third embodiment of the present invention, the first layer portion 1 The second layer portion 5 is disposed on the outer circumferential surface, and the elastic members 3 are disposed in the longitudinal direction on the groove portions 5a provided on the outer circumferential surface of the second layer portion 5. That is, referring to FIG. 9, compared to the first embodiment, step S3 and step S5 are manufactured in a reversed order. In the third embodiment of the present invention, since the elastic member 3 is disposed at a position moved from the center to the outside in comparison with the first embodiment, the restoring force, which is applied to the shaft, may be further reduced to increase the restoring force. As such, the third embodiment of the present invention shows that the first embodiment can be modified in various ways.

FIG. 10 is a cross-sectional view showing another example of FIG. 2 in order to describe the fourth embodiment according to the present invention, and shows a shaft including one elastic member 3. The fourth embodiment of the present invention describes only the differences from the first embodiment described above, and replaces the same parts with the description of the first embodiment described above. In the above-described first embodiment, an example in which three elastic members 3 are arranged in the longitudinal direction of the shaft has been described, but in the fourth embodiment of the present invention, one elastic member 3 is arranged in the longitudinal direction of the shaft. It is. This fourth embodiment of the present invention shows that the first embodiment can be variously implemented.

11, 12, and 13 are cross-sectional views showing another example of FIG. 2 for explaining the fifth, sixth, and seventh embodiments of the present invention, and the elastic member 3 It is to show that it can be carried out in various ways by varying the number of). The fifth embodiment, the sixth embodiment, and the seventh embodiment of the present invention describe only the differences from the above-described first embodiment and replace the same parts with the description of the above-described first embodiment. The first embodiment has been described with an example in which three elastic members 3 are arranged. However, in the fifth, sixth, and seventh embodiments of the present invention, the elastic members 3 each have two. The example in which dogs, four, and five are arranged is shown. These embodiments show that the present invention can be variously implemented, and in some cases, it is also possible that five or more elastic members 3 are disposed.

FIG. 14 is a cross-sectional view illustrating another example of FIG. 8, which is a third embodiment, for explaining an eighth embodiment according to the present invention. The elastic members 3 are disposed to protrude to the outer side. That is, the eighth embodiment of the present invention is provided with a protrusion 7a in which the portion where the elastic members 3 are disposed protrudes toward the outer circumferential surface side. The protruding portion 7a protrudes to the outside by a thickness t as compared to a portion where the elastic members 3 are not disposed. And these protrusions 7a have a constant length in the longitudinal direction of the shaft. The eighth embodiment of the present invention shows that the present invention can be variously implemented.

FIG. 15 is a perspective view illustrating a ninth embodiment according to the present invention, and FIG. 16 is a cross-sectional view taken along line B-B of FIG. 15 to illustrate a shaft. The ninth embodiment of the present invention describes only the differences in construction and manufacturing method compared with the first embodiment of the present invention, and the same parts as the above-described first embodiment are replaced by the description.

In the shaft of the ninth embodiment of the present invention, the first layer portion 1 disposed at the innermost portion has a circular cross section similar to a normal carbon shaft, and is wound on the outer circumferential surface of the first layer portion 1. The outer peripheral surface of the layer part 5 has a shape which protrudes to the outer peripheral side in a fixed section. In addition, in the ninth embodiment of the present invention, the merging sheet layer 21 disposed on the outside of the elastic members 3 is disposed.

That is, according to the ninth embodiment of the present invention, at least one elastic member 3 is disposed in the longitudinal direction on the outer circumference of the first layer portion 1 having a circular cross section, and the sheet is embedded in the portion disposed on the elastic member 3. Layer 21 is disposed (as shown in Figs. 16, 18 and 19). The filling sheet layer 21 may be filled in a space that may occur between the elastic members 3 and the first layer part 1 when the second layer part 5 is disposed to surround the elastic member 3. Do it. Then, the second layer portion 5 is formed to surround the first layer portion 1 and the elastic member 3 (shown in FIGS. 20 and 21). As described above, the first layer part 1 and the second layer part 5 may be formed by molding a carbon fiber fabric. The first layer part 1 and the second layer part 5 may each be composed of one layer, or may be each composed of a plurality of layers. In the ninth embodiment of the present invention, the portion where the elastic member 3 and the puff seat layer 21 are disposed is disposed from the handle of the golf club to the kick point kp or when the kick points kp are formed in large numbers. It is also possible to be placed between the kick points kp (shown in FIG. 15). The ninth embodiment of the present invention described above preferably has a structure in which the elastic member 3 is disposed in a part of the longitudinal direction of the shaft.

The method of manufacturing the shaft according to the ninth embodiment of the present invention will be described in more detail with reference to FIGS. 17 to 22 as follows.

The mold (M) is formed in a tapered shape, the shape of which is elongated and elongated according to the position, and the cross section is circular, and the carbon fiber fabric is wound around the mold (M) to form the first layer portion 1 ( S1, see FIG. 17). In this case, the mold M may be used to manufacture a shaft of a conventional golf club. Then, the elastic members 3 are disposed in the longitudinal direction at regular intervals on the outer circumference of the first layer part 1 (S3, see FIG. 18). The elastic member 3 may be the same as mentioned in the description of the above embodiments. On the outer circumferential side of the elastic member 3, a puff sheet 21 made of carbon fiber or the like is disposed (S5, see FIG. 18). Placing the peg sheet 21 on one side of the elastic member 3 prevents a space that may occur between the elastic member 3 and the first layer part 1 in the molding process so that the shaft is formed in a uniform shape. It is to. After the wrapping sheet (S5) is placed to wrap the wrap sheet 21 and the first layer portion 1 with a carbon fiber fabric to form a second layer portion 5 (S7, see Fig. 20). Then, the carbon fiber fabric wound in the mold is put in a heating furnace (S9). Then, the adhesive resin contained in the carbon fiber fabric is melted and hardened to harden to a desired shape to form a shaft (see FIG. 21). And the shaft formed in the step to remove the mold using a decentering machine (S11). Then, a shaft having a shape in which the middle portion protrudes in the form shown in FIG. 15 is manufactured.

23, 24, 25, and 26 are cross-sectional views of shafts for describing the tenth, eleventh, twelfth, and thirteenth embodiments of the present invention. ) Can be varied. That is, FIG. 23 shows one elastic member 3, FIG. 24 shows three elastic members 3, and FIGS. 25 and 26 show four elastic members 3 and five elastic members, respectively. The example in which (3) is arranged is shown. In the ninth embodiment of the present invention has been described with an example in which two elastic members 3 are arranged in a symmetrical direction, but is not limited to this, the present invention is not limited to this, the elastic member 3 is made of various numbers It can be done.

27, 28, 29, 30, and 31 are shafts for explaining the fourteenth, fifteenth, sixteenth, seventeenth, and eighteenth embodiments of the present invention. In the cross-sectional view of Fig. 2, an example in which the elastic member 3 is made of various numbers and made of different diameters is shown. That is, FIG. 27 is composed of two elastic members 3, arranged in the lengthwise direction of the shaft at positions facing each other, each of the elastic members 3 are different in diameter. In addition, FIG. 28 is made of three elastic members 3, the diameter of one elastic member 3 and the other two elastic members (3) are different. In addition, FIG. 29 is composed of four elastic members 3, elastic members 3 having the same diameter are disposed at positions facing each other, and elastic members 3 disposed adjacent to each other have different diameters. In addition, FIG. 30 is made of four elastic members 3, one elastic member 3 may be made of a larger diameter than the other elastic members (3). In addition, in FIG. 31, five elastic members 3 are formed, and one elastic member 3 may have a larger diameter than the other four elastic members 3.

These embodiments of the present invention show that the configuration of the present invention can be made more diverse, and is not limited to the examples mentioned in the above-described examples, another embodiment in various configurations by the combination of the above embodiments It is possible to make

As described above, the present invention allows at least one elastic member to be provided in the longitudinal direction to reduce the bending and torsion of the shaft so that it can hit the ball accurately and thus can be sent in a desired direction, and improves the momentary moment when the head is impacted on the ball. It has the effect of increasing the flying distance by making accurate blows.

In addition, the present invention may have the effect that the elastic member serves to reinforcement to increase the life of the shaft.

In addition, the present invention has the effect of absorbing the impact generated when the head and ball impact due to the increase of the elastic force of the elastic member to reduce the impact transmitted to the shoulder of the golfer to prevent injury.

Claims (25)

A first layer portion provided with one or more grooves and protrusions in the longitudinal direction; At least one elastic member disposed in the groove portion provided in the first layer portion; And A second layer portion surrounding the first layer portion and the elastic member; Golf club shaft comprising a. The method of claim 1, wherein the first layer portion Golf club shafts with one or more layers of carbon fiber fabric. The method of claim 1, wherein the elastic member A golf club shaft, wherein any one of carbon or metal having elastic properties is selected. The method of claim 3, wherein the metal Golf club shafts based primarily on steel or titanium. The method of claim 1, wherein the second layer portion Golf club shafts in which one or two or more layers of carbon fiber fabric are molded. 6. The outer circumferential surface of the layer according to claim 5, wherein the second outermost part of the second layer part A shaft for a golf club further comprising a layer to which the shrink film is bonded. The method of claim 1, wherein the second layer portion Golf club shaft is a portion in which the elastic member is disposed protrudes a predetermined length in the direction of the outer peripheral surface from the center than the portion where the elastic member is not disposed. The method of claim 3, wherein the elastic member The golf club shaft made of a cylindrical shape and at least one elastic member is different in thickness from the remaining elastic members. A first layer portion made of carbon and disposed at the innermost portion; At least one elastic member disposed in a longitudinal direction on an outer circumferential surface of the first layer portion; And A second layer part formed of carbon and surrounding the first layer part and the elastic member; Golf club shaft comprising a. The golf club of claim 9, wherein a cut sheet layer is provided on an outer surface of the elastic member. The method of claim 9, wherein the first layer portion Golf club shafts in which carbon fiber fabric is molded in one or more layers. The method of claim 9, wherein the elastic member A golf club shaft, wherein any one of carbon and metal having elastic properties is selected. The method of claim 12, wherein the metal A golf club shaft containing steel or titanium as the main component. The method of claim 9, wherein the second layer portion Golf club shafts in which one or two or more layers of carbon fiber fabric are molded. The method of claim 9, wherein the second layer portion Golf club shaft further comprises a layer bonded to the shrink film on the outer peripheral surface. The method of claim 9, wherein the second layer portion Golf club shaft is a portion in which the elastic member is disposed protrudes a predetermined length in the direction of the outer peripheral surface from the center than the portion where the elastic member is not disposed. The method of claim 11, wherein the elastic member A golf club shaft made of a cylindrical shape and at least one elastic member is different in thickness from the remaining elastic members. The method of claim 10, wherein the cut sheet layer is Golf club shaft made of carbon. The method of claim 9, wherein the elastic member A golf club shaft disposed between kick points or at a distance from the handle side to the kick point. Winding the first layer portion in a mold provided with at least one groove in the longitudinal direction; Disposing an elastic member having a predetermined length on the groove side after the winding of the first layer part; Wrapping the second layer portion on the outer circumferential surface of the elastic member and the first layer portion after disposing the elastic member; Forming after the winding of the second layer portion; And Removing the mold after the forming step; Method of producing a shaft for a golf club comprising a. The method of claim 20, wherein after winding the second layer portion Winding a third layer portion on the outer circumferential surface of the second layer portion Method of producing a shaft for a golf club further comprising a. The method of claim 20, wherein after winding the second layer portion Winding the shrink film on the outer peripheral surface Method of producing a shaft for a golf club further comprising a. 21. The method of claim 20, wherein the first layer portion and the second layer portion Method for producing a shaft for a golf club made of carbon fiber fabric of one layer or two or more layers each. Winding the first layer part in a mold; Disposing an elastic member having a predetermined length on an outer circumferential surface of the first layer portion after the winding of the first layer portion; Disposing a sheet fabric on the outside of the elastic member after disposing the elastic member; Winding a second layer part on an outer circumferential surface of the first layer part after the step of arranging the cut sheet fabric; Forming after the winding of the second layer portion; And Removing the mold after the forming step; Method of producing a shaft for a golf club comprising a. 25. The method of claim 24, wherein the first layer portion and the second layer portion are each made of one or more layers of carbon fiber fabric.

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