Golf Club Capable of Controlling Vibration And Manufacturing Method Thereof

Abstract

The present invention provides a golf club capable of vibration control that can reduce vibration of the shaft while increasing the elasticity and strength of the golf club shaft by having an air layer in the middle of a double structure of an outer pipe and an inner pipe, and a method for manufacturing the same. The vibration-controllable golf club of the present invention comprises: a head portion for striking a golf ball; a grip portion that allows a user to hold it with two hands; and a shaft portion connecting the head portion and the grip portion, and including an outer pipe and an inner pipe inserted inside the outer pipe.

Description

Technology Field

[0001] The present invention relates to a golf club capable of vibration control and a method for manufacturing the same. More specifically, the invention relates to a golf club capable of vibration control and a method for manufacturing the same, wherein the shaft of the golf club is composed of an outer pipe and an inner pipe, and an air layer is created between the outer pipe and the inner pipe so that the air layer between the outer pipe and the inner pipe can absorb the impact received by the head during a swing. Background Technology

[0002] As golf becomes more popular, interest in golf clubs is growing as a way to increase driving distance. Types of golf clubs include drivers, woods, utility clubs, irons, wedges, and putters. Drivers are typically used for tee shots from the tee box and can send the ball the farthest among all golf clubs. Next, woods are primarily used to hit long distances on the fairway; they are used when the fairway is too narrow to hit with a driver from the tee box, or when the ball needs to be sent a shorter distance than a driver. Utility clubs combine the features of both woods and irons; they are shorter than woods, making them easier to hit, while offering the advantage of traveling a significant distance like a wood. Irons prioritize accuracy and direction over distance. They are used to select the appropriate iron number for the desired distance and to send the ball close to the pin or the target location. Finally, wedges can be described as irons for short-distance "show game" shots—such as approaches or bunker shots—outside the green, or shots within approximately 100 meters. Lastly, putters are used to roll the ball toward the hole on the green.

[0003] As illustrated in Fig. 1, a golf club consists of a head, a grip, and a shaft. The head is the broad part that strikes the golf ball, and its size and weight vary depending on the type of club. The grip is the handle portion of the golf club. The shaft connects the head and the grip and plays a crucial role in sending the ball further in the desired direction. Shafts are broadly classified into two materials: steel and carbon. In the past, most golf club shafts were made of steel, a metal. However, as material technology advanced and heads shifted to metal, graphite shafts are now used for drivers and woods, while irons are selected from a choice between steel and graphite. A golf club shaft must be selected to match the stiffness and weight required to handle swing speeds; however, since torque and CPM (Cycles Per Minute) differ even within the same stiffness, fitting is required to select a shaft optimized for the user.

[0004] Torque is a numerical representation of how much a shaft twists from side to side during a swing. A higher torque value indicates a greater torsional moment. During the short time between the backswing and impact, the golf club head must open and then return to its correct position; however, if the torque is high, the twisting is significant, causing the head to strike the ball while remaining relatively closed. This is why women and seniors often use graphite shafts, which have lower stiffness.

[0005] CPM is a numerical representation of stiffness, calculated by fixing the butt end of the shaft, moving the tip up and down, and measuring the vibration frequency. A lower CPM value indicates a softer shaft; simply put, it means there is more oscillation, resulting in fewer vibrations per minute. Therefore, to achieve the desired direction and distance, one must use a shaft with a higher CPM as the head speed increases.

[0006] Therefore, to increase the distance of a golf club, a shaft with high torque and CPM must be used; however, as torque and shaft size increase, the shaft's elasticity and strength also rise, leading to significant vibration. Consequently, further research is needed on methods to reduce shaft vibration while simultaneously increasing its elasticity and strength. Prior art literature

[0007] Korean Registered Patent Publication No. 10-2135186 Korean Registered Patent Publication No. 10-1116948 Korean Registered Patent Publication No. 10-0747433 Korean Published Patent Publication No. 10-2007-0031157 The problem to be solved

[0008] The present invention aims to solve the above-mentioned problems by providing a golf club capable of vibration control that can reduce shaft vibration while increasing the elasticity and strength of the golf club shaft through a double structure of an outer pipe and an inner pipe with an air layer in the middle, and a method for manufacturing the same. means of solving the problem

[0009] To achieve the above-mentioned objective, the vibration-controllable golf club of the present invention comprises: a head portion for striking a golf ball; a grip portion that allows a user to hold it with two hands; and a shaft portion connecting the head portion and the grip portion, comprising an outer pipe and an inner pipe inserted inside the outer pipe.

[0010] In the first embodiment, the inner pipe is inserted so as to be in close contact with the outer pipe, and an air layer exists between the outer pipe and the inner pipe.

[0011] In the second embodiment, a plurality of cutting grooves are formed by cutting a portion of the outer side of the inner pipe, and the inner pipe is inserted so as to be in close contact with the inside of the outer pipe.

[0012] In a third embodiment, a plurality of first grooves are formed on the outer surface of the inner pipe in the longitudinal direction of the pipe, and the inner pipe is inserted into the outer pipe in close contact.

[0013] In the fourth embodiment, a plurality of second grooves are formed on the inner surface of the outer pipe in the longitudinal direction of the pipe, and the inner pipe is inserted into the outer pipe in close contact.

[0014] In the fifth embodiment, a plurality of second grooves are formed intersectingly on the inner surface of the outer pipe along the length of the pipe and a plurality of first grooves are formed intersectingly on the outer surface of the inner pipe along the length of the pipe, and the inner pipe is inserted into the outer pipe in close contact. Here, the intersection of the plurality of first grooves and the plurality of second grooves means that the plurality of first grooves and the plurality of second grooves are formed spaced apart at a certain distance so as not to come into contact with each other.

[0015] In addition, to achieve the above-mentioned purpose, a method for manufacturing a golf club capable of vibration control according to a first embodiment of the present invention comprises: a first step of preparing an outer pipe and an inner pipe having an outer diameter smaller than the inner diameter of the outer pipe; a second step of inserting the inner pipe into the outer pipe; and a third step of compressing the outer pipe into which the inner pipe is inserted.

[0016] In addition, to achieve the above-mentioned purpose, a method for manufacturing a golf club capable of vibration control according to a second embodiment of the present invention comprises: a first step of preparing an outer pipe and an inner pipe having an outer diameter smaller than the inner diameter of the outer pipe; a second step of cutting a portion of the outer side of the inner pipe to form a plurality of cutting grooves; a third step of inserting the inner pipe into the outer pipe; and a fourth step of compressing the outer pipe into which the inner pipe is inserted.

[0017] In addition, to achieve the above-mentioned purpose, a method for manufacturing a golf club capable of vibration control according to a third embodiment of the present invention comprises: a first step of preparing an outer pipe and an inner pipe having an outer diameter smaller than the inner diameter of the outer pipe; a second step of forming a plurality of first grooves in the longitudinal direction of the pipe on the outer surface of the inner pipe; a third step of inserting the inner pipe into the outer pipe; and a fourth step of compressing the outer pipe into which the inner pipe is inserted. Effects of the invention

[0018] As described above, the present invention has the advantage of being able to significantly increase the distance of a golf club by increasing the strength and elasticity of the golf club shaft because it has a double structure of an outer pipe and an inner pipe.

[0019] In addition, the present invention has the advantage of reducing vibration by providing an air layer between the outer pipe and the inner pipe to absorb vibrations generated when a golf ball is struck through the air layer. Brief explanation of the drawing

[0020] FIG. 1 shows a golf club having a shaft portion according to conventional technology. FIG. 2 shows a cross-section of a golf club and a shaft portion capable of vibration control according to a first embodiment of the present invention. FIG. 3 shows a cross-section of the shaft portion of a golf club capable of vibration control according to a second embodiment of the present invention. FIG. 4 shows a cross-section of a golf club and a shaft portion capable of vibration control according to a third embodiment of the present invention. FIG. 5 shows a cross-section of a golf club and a shaft portion capable of vibration control according to the fourth embodiment of the present invention. FIG. 6 shows a cross-section of a golf club and a shaft portion capable of vibration control according to the fifth embodiment of the present invention. FIG. 7 is a flowchart of a method for manufacturing a golf club capable of vibration control according to a first embodiment of the present invention. FIG. 8 shows a method for manufacturing a golf club capable of vibration control according to a first embodiment of the present invention. FIG. 9 is a flowchart of a method for manufacturing a golf club capable of vibration control according to a second embodiment of the present invention. FIG. 10 illustrates a method for manufacturing a golf club capable of vibration control according to a second embodiment of the present invention. FIG. 11 is a flowchart of a method for manufacturing a golf club capable of vibration control according to a third embodiment of the present invention. FIG. 12 illustrates a method for manufacturing a golf club capable of vibration control according to a third embodiment of the present invention. Specific details for implementing the invention

[0021] The present invention is susceptible to various modifications and may have various embodiments; specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the invention to specific embodiments, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. Similar reference numerals have been used for similar components in the description of each drawing.

[0022] Terms such as first, second, A, B, etc., may be used to describe various components, but said components shall not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another.

[0023] For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and / or" includes a combination of a plurality of related described items or any of a plurality of related described items.

[0024] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components in between. On the other hand, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

[0025] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to specify the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0026] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0028] Hereinafter, a golf club (10) capable of vibration control according to various embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows a cross-section of a golf club (10) capable of vibration control according to a first embodiment of the present invention and a shaft portion (300). Referring to FIG. 2, the golf club (10) capable of vibration control according to a first embodiment of the present invention may be configured to include a head portion (100), a grip portion (200), and a shaft portion (300).

[0029] The head portion (100) is the part that strikes the golf ball. The head portion (100) is the head portion of the golf club (10), and the head portion (100) plays the role of sending the golf ball in the correct direction using the force generated by the golf ball and converted into centrifugal force by the shaft portion (300). The head portion (100) can be made of metals such as 6A-4V TITAM (6% aluminum, 4% titanium, 90% titanium), soft iron forged iron, stainless steel, and beta titanium.

[0030] The grip portion (200) is a handle that allows the user to hold the golf club (10) with both hands. The grip portion (200) is located on the upper part of the shaft portion (300) and is wrapped with leather or rubber to serve as a handle.

[0031] The shaft portion (300) connects the head portion (100) and the grip portion (200) and includes an outer pipe (320) and an inner pipe (310) inserted inside the outer pipe (320). The outer diameter of the inner pipe (310) must be smaller than the inner diameter of the outer pipe (320) so that the inner pipe (310) can be inserted inside the outer pipe (320). In the shaft portion (300) according to the first embodiment of the present invention, an air layer (A) exists between the outer pipe (320) and the inner pipe (310). The thickness of the air layer (A) is very fine, and vibrations can be absorbed through this air layer (A). The shaft portion (300) according to the prior art is made of a single layer of steel pipe. In the first embodiment of the present invention, two steel pipes are used, and an inner pipe (310) having an outer diameter smaller than the inner diameter of the outer pipe (320) is inserted into the outer pipe (320). When the inner pipe (310) is inserted, the outer side of the outer pipe (320) is compressed using a presser, and through compression, the inner pipe (310) is fixed inside the outer pipe (320). Using two pipes instead of a single pipe increases the elasticity and strength of the shaft portion (300). That is, using a layer of thin pipes instead of a thick single pipe increases strength, similar to the forging effect of iron, and increases elasticity because the thickness is thin. In addition, even when the outer pipe (320) and the inner pipe (310) are compressed by a presser, a very fine air layer (A) exists between the outer pipe (320) and the inner pipe (310). When a golf ball is struck with a golf club (10), the impact is transmitted from the head part (100) to the shaft part (300), and the vibration caused by the impact vibrates the outer pipe (320) and the inner pipe (310), but the vibration is absorbed by the air layer (A) in the middle, so the impact on the head part (100) is absorbed.

[0032] FIG. 3 shows a cross-section of a shaft portion (300) of a golf club (10) capable of vibration control according to a second embodiment of the present invention. Referring to FIG. 3, in the shaft portion (300) according to the second embodiment of the present invention, a portion of the outer side of an inner pipe (310) is cut to form a plurality of cutting grooves (311), and the inner pipe (310) can be inserted so as to be in close contact with the inner pipe (320). A cutting tool is used on the outer side of the inner pipe (310) in the direction of the cross-section of the pipe to cut and cut a certain length of the outer surface to form the cutting grooves (311). Here, the cutting grooves (311) form a plurality of circumferential cutting grooves spaced apart at a certain interval in the longitudinal direction of the inner pipe (310). If multiple circular cutting grooves are formed at regular intervals rather than a single circular cutting groove along a certain length of the pipe, the partitions of the spaced cutting grooves form a support between the inner pipe and the outer pipe, which is advantageous in terms of forming an air layer. Meanwhile, it is desirable to form the spacing between the cutting grooves among the multiple cutting grooves narrower as one moves from the grip portion to the head portion. Additionally, it is desirable to form the depth of the cutting grooves among the multiple cutting grooves deeper as one moves from the grip portion to the head portion. This has the effect of increasing the vibration transmitted from the head portion. The thickness of the cutting groove (311) is preferably such that it does not affect the strength of the inner pipe (310). For example, the thickness of the cutting groove of the inner pipe (310) can be 1 / 100 to 1 / 10 of the thickness of the inner pipe (310), and preferably 1 / 50 to 1 / 40. Additionally, the thickness of the cutting groove of the outer pipe can be 1 / 100 to 1 / 10 of the thickness of the outer pipe, and preferably 1 / 50 to 1 / 40. If the thickness of the cutting groove (311) becomes too thick, there is a risk of causing cracks in the inner pipe (310) and the inner pipe (310) rupturing. The cutting groove (311) can be formed in multiple numbers at regular intervals.The inner pipe (310) having a cutting groove (311) formed therein is inserted into the outer pipe (320), and the outer pipe (320) is compressed using a presser to compress the outer pipe (320) so that the inner pipe (310) and the outer pipe (320) are compressed. Here, in the second embodiment, the outer pipe (320) can be compressed more closely by applying a greater force to the outer pipe (320) than in the first embodiment. That is, because an air layer (A) is formed by the cutting groove (311), a separate air layer (A) may not be required between the inner side of the outer pipe (320) and the outer side of the inner pipe (310). An air layer (A) is formed between the cutting groove (311) of the outer pipe (320) and the inner pipe (310), and vibrations transmitted from the head part (100) can be absorbed through the air layer (A).

[0033] FIG. 4 shows a cross-section of a golf club (10) capable of vibration control and a shaft portion (300) according to a third embodiment of the present invention. Referring to FIG. 4, in the shaft portion (300) according to the third embodiment of the present invention, a plurality of first grooves (312) are formed in the longitudinal direction of the pipe on the outer surface of the inner pipe (310), and the inner pipe (310) can be inserted into the outer pipe (320) in close contact. A cutting tool can be used to form the first grooves (312) at regular intervals along the longitudinal direction of the pipe on the outer surface of the inner pipe (310). The inner pipe (310) having a plurality of first grooves (312) formed on the outer surface is inserted into the outer pipe (320), and the outer surface of the outer pipe (320) is compressed using a presser so that the inner pipe (310) and the outer pipe (320) are compressed. Here, in the third embodiment, the outer pipe (320) can be compressed more closely by applying a greater force to the outside of the outer pipe (320) than in the first embodiment. That is, because an air layer (A) is formed by a plurality of first grooves (312), a separate air layer (A) may not be required between the inner side of the outer pipe (320) and the outer side of the inner pipe (310). An air layer (A) is formed between the outer pipe (320) and the inner pipe (310) through the first grooves (312), and vibrations transmitted from the head portion (100) can be absorbed through this air layer (A).

[0035] FIG. 5 shows a cross-section of a golf club (10) capable of vibration control and a shaft portion (300) according to a fourth embodiment of the present invention. Referring to FIG. 5, in the shaft portion (300) according to the fourth embodiment of the present invention, a plurality of second grooves (321) are formed in the longitudinal direction of the pipe on the inner surface of the outer pipe (320), and an inner pipe (310) can be inserted in close contact into the outer pipe (320). A cutting tool can be used to form the second grooves (321) at regular intervals along the longitudinal direction of the pipe on the inner surface of the outer pipe (320). The inner pipe (310) is inserted into the outer pipe (320) in which a plurality of second grooves (321) are formed on the inner side, and a presser is used to press the outside of the outer pipe (320) so that the inner pipe (310) and the outer pipe (320) are compressed. Here, in the fourth embodiment, the outer pipe (320) can be compressed more closely by applying a greater force to the outside of the outer pipe (320) than in the first embodiment, thereby making the outer pipe (320) and the inner pipe (310) more closely attached. That is, because an air layer (A) is formed by a plurality of second grooves (321), a separate air layer (A) may not be required between the inner side of the outer pipe (320) and the outer side of the inner pipe (310). An air layer (A) is formed between the outer pipe (320) and the inner pipe (310) through the second grooves (321), and vibrations transmitted from the head portion (100) can be absorbed through this air layer (A).

[0036] FIG. 6 shows a cross-section of a golf club (10) capable of vibration control and a shaft portion (300) according to the fifth embodiment of the present invention. Referring to FIG. 6, in the shaft portion (300) according to the fifth embodiment of the present invention, a plurality of second grooves (321) are formed in the longitudinal direction of the pipe on the inner surface of the outer pipe (320) and a plurality of first grooves (312) are formed in the longitudinal direction of the pipe on the outer surface of the inner pipe (310) in an alternating manner, so that the inner pipe (310) can be inserted in close contact with the inside of the outer pipe (320). A cutting tool is used to form the second grooves (321) at regular intervals along the longitudinal direction of the pipe on the inner surface of the outer pipe (320), and they are formed in an alternating manner so as not to overlap with the first grooves (312). Additionally, a first groove (312) is formed at regular intervals along the length of the pipe using a cutter on the outer surface of the inner pipe (310), and is formed in an intersecting manner so as not to overlap with the second groove (321). The inner pipe (310), having a plurality of first grooves (312) formed on the outer side, is inserted into the outer pipe (320), having a plurality of second grooves (321) formed on the inner side, and the outer pipe (320) is compressed using a presser so that the inner pipe (310) and the outer pipe (320) are compressed. Here, in the fifth embodiment, the outer pipe (320) can be compressed with greater force than in the first embodiment so that the outer pipe (320) and the inner pipe (310) are more closely attached. That is, because an air layer (A) is formed by a plurality of first grooves (312) and a plurality of second grooves (321), a separate air layer (A) may not be required between the inner side of the outer pipe (320) and the outer side of the inner pipe (310). An air layer (A) is formed between the outer pipe (320) and the inner pipe (310) through the first groove (312) and the second groove (321), and vibrations transmitted from the head part (100) can be absorbed through this air layer (A).

[0037] Meanwhile, vibration control becomes possible by forming a single golf club by tightly fitting the outer pipe into the interior of the outer pipe of the present invention. Here, while the thickness of the outer pipe is constant, it is preferable to form the outer pipe so that it becomes thinner from the grip portion to the head portion. This is because, when swinging the golf club, the thickness of the outer pipe becomes thinner from the grip portion to the head portion, increasing flexibility in the head portion, which is advantageous for vibration control.

[0038] The first to fifth embodiments have been described above, but the present invention may use the above embodiments in combination. For example, the second embodiment and the fourth embodiment may be combined. That is, a portion of the outer side of the inner pipe (310) may be cut to form a plurality of cutting grooves (311), and a plurality of second grooves (321) may be formed on the inner surface of the outer pipe (320) in the longitudinal direction of the pipe so that the inner pipe (310) can be inserted into the outer pipe (320) in close contact. The inner pipe (310), having a plurality of cutting grooves (311) formed on its outer side, is inserted into the outer pipe (320), having a plurality of second grooves (321) formed on its inner side, and the outer side of the outer pipe (320) is compressed using a presser so that the inner pipe (310) and the outer pipe (320) are compressed together. An air layer (A) is formed between the inner surface of the outer pipe (320) and the outer surface of the inner pipe (310) by the cutting groove (311) and the second groove (321), and vibrations transmitted from the head portion (100) can be absorbed through this air layer (A).

[0040] Hereinafter, a method for manufacturing a golf club (10) capable of vibration control according to various embodiments will be described with reference to the drawings. FIG. 7 is a flowchart of a method for manufacturing a golf club (10) capable of vibration control according to a first embodiment of the present invention, and FIG. 8 illustrates a method for manufacturing a golf club (10) capable of vibration control according to a first embodiment of the present invention. Referring to FIG. 7 or FIG. 8, a method for manufacturing a golf club (10) capable of vibration control according to a first embodiment of the present invention may be configured to include the following three steps.

[0041] Step 1 (S10): A step of preparing an outer pipe (320) and an inner pipe (310) having an outer diameter smaller than the inner diameter of the outer pipe (320).

[0042] Step 2 (S20): Step of inserting the inner pipe (310) into the outer pipe (320).

[0043] Step 3 (S30): Step of compressing the outer pipe (320) into which the inner pipe (310) is inserted.

[0044] The first step (S10) is to prepare an outer pipe (320) and an inner pipe (310). For example, if an outer pipe (320) with an outer diameter of 10 mm and a thickness of 1 mm is used, an inner pipe (310) with an outer diameter of 8 mm and a thickness of 1 mm can be used, where the outer diameter is smaller than the inner diameter of the outer pipe (320), which is 9 mm.

[0045] The second step (S20) is to insert the inner pipe (310) into the outer pipe (320). Since the outer diameter of the inner pipe (310) is smaller than the inner diameter of the outer pipe (320), the inner pipe (310) can be inserted into the outer pipe (320) without resistance.

[0046] The third step (S30) is a step of compressing the outer pipe (320) into which the inner pipe (310) is inserted using a presser. Since the outer diameter of the inner pipe (310) is smaller than the inner diameter of the outer pipe (320), there is a space between the outer pipe (320) and the inner pipe (310) after insertion of the inner pipe (310), allowing the inner pipe (310) to move inside the outer pipe (320). Therefore, the outer pipe (320) and the inner pipe (310) are compressed tightly using a presser. After compression, a fine air layer (A) may be formed between the outer pipe (320) and the inner pipe (310).

[0047] FIG. 9 is a flowchart of a method for manufacturing a vibration-controllable golf club (10) according to a second embodiment of the present invention, and FIG. 10 illustrates a method for manufacturing a vibration-controllable golf club (10) according to a second embodiment of the present invention. Referring to FIG. 9 or FIG. 10, a method for manufacturing a vibration-controllable golf club (10) according to a second embodiment of the present invention may be configured to include the following four steps.

[0048] Step 1 (R10): A step of preparing an outer pipe (320) and an inner pipe (310) having an outer diameter smaller than the inner diameter of the outer pipe (320).

[0049] Step 2 (R20): A step of cutting a portion of the outer side of the inner pipe (310) to form a plurality of cutting grooves (311).

[0050] Step 3 (R30): Step of inserting the inner pipe (310) into the outer pipe (320).

[0051] Step 4 (R40): Step of compressing the outer pipe (320) into which the inner pipe (310) is inserted.

[0052] The first step (R10) is to prepare an outer pipe (320) and an inner pipe (310). For example, if an outer pipe (320) with an outer diameter of 10 mm and a thickness of 1 mm is used, an inner pipe (310) with an outer diameter of 8 mm and a thickness of 1 mm can be used, where the outer diameter is smaller than the inner diameter of the outer pipe (320), which is 9 mm.

[0053] The second step (R20) is a step of forming a plurality of cutting grooves (311) by using a cutting tool on the outer side of the inner pipe (310) in the direction of the pipe's cross-section to cut the outer surface to a certain length. The plurality of cutting grooves (311) form an air layer (A) between the outer pipe (320) and the inner pipe (310).

[0054] The third step (R30) is the step of inserting the inner pipe (310) into the outer pipe (320). Since the outer diameter of the inner pipe (310) is smaller than the inner diameter of the outer pipe (320), the inner pipe (310) can be inserted into the outer pipe (320) without resistance.

[0055] Step 4 (R30) is a step of compressing the outer pipe (320) into which the inner pipe (310) is inserted using a presser. Since the outer diameter of the inner pipe (310) is smaller than the inner diameter of the outer pipe (320), there is a space between the outer pipe (320) and the inner pipe (310) after insertion of the inner pipe (310), allowing the inner pipe (310) to move inside the outer pipe (320). Therefore, the outer pipe (320) and the inner pipe (310) are compressed tightly using a presser. After compression, an air layer (A) can be formed in the space of a plurality of cutting grooves (311) between the outer pipe (320) and the inner pipe (310).

[0056] FIG. 11 is a flowchart of a method for manufacturing a vibration-controllable golf club (10) according to a third embodiment of the present invention, and FIG. 12 illustrates a method for manufacturing a vibration-controllable golf club (10) according to a third embodiment of the present invention. Referring to FIG. 11 or FIG. 12, a method for manufacturing a vibration-controllable golf club (10) according to a third embodiment of the present invention may be configured to include the following four steps.

[0057] Step 1 (T10): A step of preparing an outer pipe (320) and an inner pipe (310) having an outer diameter smaller than the inner diameter of the outer pipe (320).

[0058] Step 2 (T20): A step of forming a plurality of first grooves (312) along the length of the pipe on the outer surface of the inner pipe (310).

[0059] Step 3 (T30): Step of inserting the inner pipe (310) into the outer pipe (320).

[0060] Step 4 (T40): Step of compressing the outer pipe (320) into which the inner pipe (310) is inserted.

[0061] The first step (T10) is to prepare an outer pipe (320) and an inner pipe (310). For example, if an outer pipe (320) with an outer diameter of 10 mm and a thickness of 1 mm is used, an inner pipe (310) with an outer diameter of 8 mm and a thickness of 1 mm can be used, where the outer diameter is smaller than the inner diameter of the outer pipe (320), which is 9 mm.

[0062] The second step (T20) is to form first grooves (312) at regular intervals along the length of the pipe using a cutter on the outer surface of the inner pipe (310). The first grooves (312) are formed on the outer surface of the inner pipe (310) so that they are not too deep.

[0063] The third step (T30) is the step of inserting the inner pipe (310) into the outer pipe (320). Since the outer diameter of the inner pipe (310) is smaller than the inner diameter of the outer pipe (320), the inner pipe (310) can be inserted into the outer pipe (320) without resistance.

[0064] Step 4 (T30) is a step of compressing the outer pipe (320) into which the inner pipe (310) is inserted using a presser. Since the outer diameter of the inner pipe (310) is smaller than the inner diameter of the outer pipe (320), there is a space between the outer pipe (320) and the inner pipe (310) after insertion of the inner pipe (310), allowing the inner pipe (310) to move inside the outer pipe (320). Therefore, the outer pipe (320) and the inner pipe (310) are compressed tightly using a presser. After compression, an air layer (A) can be formed in the space of a plurality of first grooves (312) between the outer pipe (320) and the inner pipe (310). Due to this air layer (A), vibrations generated when striking a golf ball are transmitted to the shaft part (300) via the head part (100) and can be absorbed through the air layer (A).

[0066] The present invention is not limited to the above embodiments but can be manufactured in various different forms, and those skilled in the art will understand that the invention can be implemented in other specific forms without changing the technical concept or essential features of the invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. Explanation of the symbols

[0067] 100 : Head section 200: Grip part 300 : Shaft section 310 : Inner pipe 311 : Cutting groove 312 : 1st Home 320 : Outer pipe 321 : 2nd Home A : Air layer

Claims

Claim 1 A golf club capable of vibration control, comprising: a head portion for striking a golf ball; a grip portion that allows a user to hold it with two hands; and a shaft portion connecting the head portion and the grip portion, and including an outer pipe and an inner pipe inserted inside the outer pipe; wherein the inner pipe is inserted in close contact inside the outer pipe, and a plurality of cutting grooves are formed by cutting a portion of the outer side of the inner pipe so that an air layer exists between the outer pipe and the inner pipe, and the cutting grooves form a plurality of circumferential cutting grooves spaced at a certain interval in the longitudinal direction of the inner pipe, and the spacing between the cutting grooves among the plurality of cutting grooves is formed to be narrower as it goes from the grip portion to the head portion. Claim 2 delete Claim 3 delete Claim 4 delete Claim 5 delete

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