KR102856328B1 - Golf club for trial hit and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a golf club for a test shot for golf club fitting, comprising: a head; a receiving member installed inside the head; a shaft; an insertion member fixedly installed at a distal end of the shaft and inserted inside the receiving member; and a cover member positioned in a state fitted to the shaft and fastened to the receiving member while the insertion member is inserted inside the receiving member; wherein the head and the shaft are from different manufacturers.

Description

Golf club for trial hit and manufacturing method therefor for golf club fitting {GOLF CLUB FOR TRIAL HIT AND MANUFACTURING METHOD THEREOF}

The present invention relates to a golf club for use as a test shot and a method for manufacturing the same, and more particularly, to a golf club for use as a test shot and a method for manufacturing the same for golf club fitting that allows for a test shot by freely combining heads and shafts of different manufacturers and characteristics.

Typically, a golf club consists of a head that strikes the golf ball, a shaft (a long, bar-shaped device connected to the head), and a grip formed on the shaft. Golf clubs include drivers, woods, utilities, irons, and putters, and each can be tailored to specific uses.

Since the various characteristics of these golf clubs have a significant impact on distance and direction accuracy, users must be able to choose a golf club with specifications (e.g. head weight, head angle, shaft material, shaft strength, etc.) that are suitable for their swing habits, age, and physical condition.

However, when purchasing a golf club, stores usually only have one type of golf club for trial use, and as a result, the buyer makes a purchase decision after trying out only one golf club for trial use. As a result, there are frequent cases where the buyer regrets the purchase because the specifications of the golf club do not fit them after purchasing and using the actual golf club.

The purpose of the present invention, which was devised to solve the above-described problems, is to provide a golf club for a test shot and a manufacturing method thereof for a golf club fitting that allows a test shot by freely combining multiple heads and shafts having different characteristics.

In addition, another object of the present invention is to provide a golf club for a test fit with improved precision and durability and a method for manufacturing the same by applying different materials for a receiving member, an insert member, and a cover member.

A golf club for a golf club fitting according to an embodiment of the present invention comprises a head, a receiving member installed inside the head, a shaft, an insertion member fixedly installed at a distal end of the shaft and inserted inside the receiving member, and a cover member positioned in a state fitted to the shaft and fastened to the receiving member while the insertion member is inserted inside the receiving member, wherein the head and the shaft may be characterized in that they are from different manufacturers.

In addition, the receiving member, the insertion member, and the cover member may be characterized in that they are each manufactured from different materials.

In addition, the receiving member may include an aluminum material, the insertion member may include a steel material, and the cover member may include a titanium material.

In addition, the receiving member may include a base portion inserted into the head, an anti-rotation groove formed on a bottom surface of the base portion, an extension portion formed to extend outward from the base portion, a first screw structure formed on an outer circumferential surface of the extension portion, and a flange portion formed to protrude from a connection portion of the base portion and the extension portion, and the insertion member may include a body portion coupled to a distal end of the shaft, and an anti-rotation protrusion formed to protrude from a bottom surface of the body portion and to be inserted and coupled into the anti-rotation groove, and the cover member may include a first cylindrical portion having a second screw structure formed on an inner circumferential surface thereof and screw-connected with the first screw structure of the extension portion, a second cylindrical portion formed to extend from the first cylindrical portion, and a plurality of tool grooves formed on an outer circumferential surface of the second cylindrical portion.

In addition, the basic diameter of the shaft may be set to 8.8 mm to 9.5 mm, but the diameter of the shaft end may be set to 8.65 mm to 9.45 mm through a sanding process for the end of the shaft.

A method for manufacturing a test golf club for golf club fitting according to an embodiment of the present invention comprises the steps of preparing a first golf club and a second golf club from different manufacturers, separating a first head and a first shaft of the first golf club and separating a second head and a second shaft of the second golf club, machining a head hole of the first head and a head hole of the second head to increase their diameters, performing a sanding process on a distal end of the first shaft and a distal end of the second shaft, installing receiving members in the head holes of the first head and the head holes of the second head, respectively, and installing insert members in the distal end of the first shaft and the distal end of the second shaft, respectively, and inserting and connecting the insert member of the second shaft to the receiving member of the first head and then fastening a cover member to the receiving member of the first head, and inserting and connecting the insert member of the first shaft to the receiving member of the second head and then fastening the cover member to the receiving member of the second head, wherein the receiving member, the insert member, and The above cover members may be characterized in that they are each manufactured from different materials.

A golf club fitting connector according to an embodiment of the present invention is a golf club fitting connector that enables coupling and disassembly between heads and shafts of different manufacturers, and may include a receiving member installed inside the head, an insertion member fixedly installed at a distal end of the shaft and inserted inside the receiving member, and a cover member positioned in a state fitted to the shaft and fastened to the receiving member while the insertion member is inserted inside the receiving member.

According to the present invention as described above, a golf club for a tee shot and a method for manufacturing the same can be provided for a golf club fitting that allows a tee shot by freely combining multiple heads and shafts having different characteristics.

In addition, according to the present invention, by applying different materials for the receiving member, the insertion member, and the cover member, a golf club for a golf club fitting with improved precision and durability and a method for manufacturing the same can be provided.

Fig. 1 is a drawing showing a golf club for use in a stadium according to an embodiment of the present invention.
Figure 2 is a drawing showing a connector according to an embodiment of the present invention.
FIG. 3a is a drawing showing a receiving member according to an embodiment of the present invention, and FIG. 3b is a drawing showing a state in which a receiving member according to an embodiment of the present invention is coupled to a head.
FIG. 4a is a drawing showing a shaft according to an embodiment of the present invention, FIG. 4b is a drawing showing an insertion member according to an embodiment of the present invention, FIG. 4c is a drawing showing a cross-section of the insertion member shown in FIG. 4b, and FIG. 4d is a drawing showing a state in which a shaft and an insertion member according to an embodiment of the present invention are combined.
FIG. 5a is a drawing showing a cover member and a ring member according to an embodiment of the present invention, FIG. 5b is a drawing showing a cross-section of the cover member shown in FIG. 5a, and FIG. 5c is a drawing showing a state in which the cover member and the ring member according to an embodiment of the present invention are positioned on a shaft.
Fig. 6 is a drawing showing the state of coupling of a head and a shaft according to an embodiment of the present invention.
Fig. 7 is a drawing for explaining a method for manufacturing a golf club for a tester according to an embodiment of the present invention.

Hereinafter, embodiments related to the present invention will be illustrated in the drawings and described in detail. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and it should be understood that all modifications, equivalents, and alternatives included within the spirit and technical scope of the present invention are included.

When describing components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only intended to distinguish the components from other components, and do not limit the nature, order, or sequence of the components. Furthermore, terms such as "include," "comprise," or "have" used herein, unless specifically stated otherwise, imply that the corresponding component may be included, and therefore should be interpreted to include other components rather than excluding other components.

Hereinafter, with reference to drawings related to embodiments of the present invention, a test golf club (hereinafter, a test golf club) for golf club fitting according to an embodiment of the present invention will be described.

Fig. 1 is a drawing showing a golf club for use in a stadium according to an embodiment of the present invention.

A golf club (1) for hitting a golf ball according to an embodiment of the present invention may include a head (10) for hitting a golf ball, a shaft (20) connected to the head (10), a grip (30) formed on one side of the shaft (20), and a connector (50, hereinafter referred to as a connector) for fitting a golf club installed at a connection portion between the head (10) and the shaft (20).

That is, since it is possible to combine multiple heads (10) having different weights and shapes and multiple shafts (20) having different lengths and materials in various forms through the connector (50) according to the embodiment of the present invention, the user can select a head (10) and shaft (20) that are suitable for his/her body type, swing style, age, physical condition, etc.

In addition, when using a connector (50) according to an embodiment of the present invention, there is an advantage in that a combination of various types of heads (10) and shafts (20) is possible regardless of the manufacturer or brand. Accordingly, a golf club (1) for use in a test according to an embodiment of the present invention can be configured to include heads (10) and shafts (20) from different manufacturers.

Figure 2 is a drawing showing a connector according to an embodiment of the present invention.

Referring to FIG. 2, a connector (50) according to an embodiment of the present invention may be configured to include a receiving member (100), an insertion member (200), a cover member (300), and may additionally include a ring member (400).

The receiving member (100) can be installed inside the head (10) and inserted through a head hole (11, see FIG. 3a) that exists for connecting the shaft (20). An additional machining process using a drilling device or the like can be performed to adjust the diameter of the head hole (11) before inserting the receiving member (100), and a separate adhesive can be used for fixedly connecting the head (10) and the receiving member (100).

In addition, the receiving member (100) may be made of a metal material. For example, the receiving member (100) may be manufactured from an aluminum material. In this case, there is an advantage in that the manufacturing process of the receiving member (100) with a complex shape becomes easier compared to the insert member (200) and the cover member (300).

The insertion member (200) is fixedly installed at the end of the shaft (20) and may have a form that allows insertion and separation with respect to the receiving member (100) installed in the head (10). An additional processing process may be performed on the shaft (20) before the installation of the insertion member (200), and a separate adhesive may be used for the fixed connection of the shaft (20) and the insertion member (200).

In addition, the insert member (200) may be made of the same material as the shaft (20) in order to maintain the characteristics of the shaft (20) to the greatest extent possible. For example, the insert member (200) may be made of steel, and other materials such as carbon graphite may also be used.

The cover member (300) is positioned in a state fitted to the shaft (20), and can be fastened while the insertion member (200) is inserted into the receiving member (100). Accordingly, the insertion member (200) can be prevented from being separated from the receiving member (100).

Additionally, the cover member (300) may be made of a metal material. For example, the cover member (300) may be made of titanium, in which case the strength and durability of the cover member (300) may be improved.

The ring member (40) is positioned while being fitted to the shaft (20) and can be placed on the upper side of the cover member (300). This ring member (40) can restrict the movement of the cover member (300) when the head (10) and the shaft (20) are in a separated state, thereby preventing the cover member (300) from being separated from the shaft (20), and can provide elastic support to the cover member (300) when the head (10) and the shaft (20) are in a coupled state, thereby reinforcing the fastening force of the cover member (300).

Additionally, the ring member (40) may be formed of a material having an elastic material, and may include, but is not limited to, a rubber material, for example.

Meanwhile, the total weight of the receiving member (100), the insertion member (200), and the cover member (300) may be set to 10 g to 14 g. This is because when the total weight of the receiving member (100), the insertion member (200), and the cover member (300) is less than 10 g, the weight becomes lighter than that of a normal golf club, and when the total weight of the receiving member (100), the insertion member (200), and the cover member (300) exceeds 14 g, the weight becomes heavier than that of a normal golf club, resulting in a significantly reduced theta effect.

FIG. 3a is a drawing showing a receiving member according to an embodiment of the present invention, and FIG. 3b is a drawing showing a state in which a receiving member according to an embodiment of the present invention is coupled to a head.

Referring to FIGS. 3a and 3b, the receiving member (100) according to an embodiment of the present invention may include a base portion (110), a flange portion (120), and an extension portion (130).

The base portion (110) is a portion inserted into the head hole (11) and may be formed in a cylindrical shape having an internal receiving space (111). In addition, an anti-rotation groove (112) may be formed on the inner bottom surface of the base portion (110).

The anti-rotation groove (112) can be combined with the anti-rotation protrusion (220, see FIG. 4b) of the insert member (200) to prevent the head (10) or shaft (20) from rotating independently. To this end, the anti-rotation groove (112) can be formed in a polygonal (e.g., hexagonal, etc.) or oval shape, and the anti-rotation protrusion (220) of the insert member (200) can have a shape corresponding to the anti-rotation groove (112).

The extension portion (130) is formed to extend outward from the base portion (110) and may have an internal space that is connected to the receiving space (111) of the base portion (110). In addition, a first screw structure (131) for fastening to the cover member (300) may be formed on the outer circumferential surface of the extension portion (130).

The flange portion (120) is formed to protrude horizontally from the connection portion between the base portion (110) and the extension portion (130), thereby partitioning the flange portion (120) and the extension portion (130). In addition, the lower surface of the flange portion (120) is positioned to be in close contact with the upper portion of the head (10), and when the cover member (300) is later fastened, the upper surface of the flange portion (120) can be in close contact with the cover member (300).

FIG. 4a is a drawing showing a shaft according to an embodiment of the present invention, FIG. 4b is a drawing showing an insertion member according to an embodiment of the present invention, FIG. 4c is a drawing showing a cross-section of the insertion member shown in FIG. 4b, and FIG. 4d is a drawing showing a state in which a shaft and an insertion member according to an embodiment of the present invention are combined.

Referring to FIG. 4a, the basic diameter (a1) of the shaft (20) according to the embodiment of the present invention can be set to 8.8 mm to 9.5 mm.

At this time, the distal end (21) of the shaft (20) is a portion that is coupled with the body (210) of the insertion member (200), and a sanding process may be performed on the distal end (21) before coupling with the insertion member (200). This is to increase the bonding strength during the bonding process with the insertion member (200) by removing the coating surface, etc. existing on the surface of the distal end (21), and may be performed by equipment such as a belt sander. Accordingly, the distal end (21) of the shaft (20) may be set to a diameter (a2) that is reduced by 0.05 mm to 0.15 mm compared to the existing diameter (a1). For example, the diameter (a2) of the distal end (21) of the shaft (20) may be set to 8.65 mm to 9.45 mm.

In addition, the length (a3) of the end portion (21) of the shaft (20) coupled to the insert member (200) may be set to 20 mm to 26 mm. This is because, if the length (a3) of the end portion (21) is less than 20 mm, the adhesive strength with the insert member (200) may be weakened, which may cause breakage during the casting process, and if the length (a3) of the end portion (21) exceeds 26 mm, the characteristics of the existing shaft (20) are limited.

Referring to FIGS. 4b to 4d, the insertion member (200) according to an embodiment of the present invention may include a body portion (210) and an anti-rotation protrusion (220).

The body portion (210) is a portion into which the distal end (21) of the shaft (20) is inserted, and may be formed in a cylindrical shape having an internal receiving space (211). In addition, an anti-rotation protrusion (220) protruding outward may be formed on the outer bottom surface of the body portion (210).

The anti-rotation protrusion (220) is a portion that is combined with the above-described anti-rotation groove (112), and may be formed in a polygonal (e.g., hexagonal) or oval shape. FIG. 4b illustrates a case where the anti-rotation protrusion (220) is formed in the shape of a hexagonal column, and the corner portion (222) of the anti-rotation protrusion (220) may be designed as an inclined surface (222) having a predetermined angle (d). Through this inclined surface (222), the anti-rotation protrusion (220) may be easily inserted and combined into the anti-rotation groove (112). At this time, the angle (d) formed by the inclined surface (222) of the anti-rotation protrusion (220) and the end surface (221) of the anti-rotation protrusion (220) may be set to 20° to 40°. This is because, if the angle (d) is less than 20°, the engagement of the anti-rotation projection (220) and the anti-rotation groove (112) is not smooth, and if the angle (d) exceeds 40°, the fixing force between the anti-rotation projection (220) and the anti-rotation groove (112) is weakened, which may cause the shaft (20) to rotate during the theta process.

Additionally, the height (b3) of the anti-rotation protrusion (220) may be set to 3 mm to 4 mm. This is because, when the height (b3) of the anti-rotation protrusion (220) is less than 3 mm, the bonding force with the anti-rotation groove (112) is reduced, and when the height (b3) of the anti-rotation protrusion (220) exceeds 4 mm, interference with the head (10) structure may occur.

In addition, the diameter (b4) of the anti-rotation protrusion (220) can be set to 4 mm to 6 mm. This is because, if the diameter (b4) of the anti-rotation protrusion (220) is less than 4 mm, there is a risk that the anti-rotation protrusion (220) may be damaged by external impact, etc. while being coupled to the anti-rotation groove (112), and if the diameter (b4) of the anti-rotation protrusion (220) exceeds 6 mm, the manufacturing cost increases due to an unnecessary area.

Meanwhile, the overall length (b1) of the insertion member (200) may be set to 25 mm to 30 mm. This is because, if the overall length (b1) of the insertion member (200) is less than 25 mm, the fixing force with the head (10) may be weakened, which may cause damage to the connection portion, and if the overall length (b1) of the insertion member (200) exceeds 30 mm, the fixing force with the head (10) may be excessive, which may limit the characteristics of the shaft (20).

In addition, the length (b2) of the accommodation space (211) formed inside the body portion (210) can be designed to be the same as the length (a3) of the end portion (21) of the shaft (20) described above. For example, the length (b2) of the accommodation space (211) can be set to 20 mm to 26 mm. As described above, if the length (b2) of the accommodation space (211) is less than 20 mm, the adhesive force with the shaft (20) may be weakened, which may cause breakage during the casting process. In addition, if the length (b2) of the accommodation space (211) exceeds 26 mm, the characteristics of the existing shaft (20) are limited.

Additionally, the diameter (c1) of the accommodation space (211) formed inside the body portion (210) can be designed to be the same as the diameter (a2) of the end portion (21) of the shaft (20) described above. For example, the diameter (c1) of the accommodation space (211) can be set to 8.65 mm to 9.45 mm.

In addition, the thickness (c2) of the body portion (210) surrounding the receiving space (211) may be set to 0.3 mm to 0.5 mm. This is because, if the thickness (c2) of the body portion (210) is less than 0.3 mm, the strength may be reduced, which may cause breakage during use, and if the thickness (c2) of the body portion (210) exceeds 0.5 mm, it may be difficult to couple with the shaft (20).

FIG. 5a is a drawing showing a cover member and a ring member according to an embodiment of the present invention, FIG. 5b is a drawing showing a cross-section of the cover member shown in FIG. 5a, and FIG. 5c is a drawing showing a state in which the cover member and the ring member according to an embodiment of the present invention are positioned on a shaft.

Referring to FIGS. 5a to 5c, a cover member (300) according to an embodiment of the present invention may include a first cylindrical portion (310), a second cylindrical portion (320), and a tool groove (330).

The first cylindrical portion (310) is a portion that is screw-connected with the extension portion (130), and a second screw structure (311) corresponding to the first screw structure (131) of the receiving member (100) may be formed on the inner surface of the first cylindrical portion (310). For example, when the first screw structure (131) has a male screw shape, the second screw structure (311) may have a female screw shape.

In addition, the height (e1) of the first cylindrical portion (310) can be designed to be 4 mm to 6 mm. This is because, if the height (e1) of the first cylindrical portion (310) is less than 4 mm, there is a risk that the fastening force with the cover member (300) may be reduced, resulting in breakage, etc., and if the height (e1) of the first cylindrical portion (310) exceeds 6 mm, it may affect the characteristics of the existing shaft (20).

The second cylindrical portion (320) is formed to extend from the first cylindrical portion (310), and a plurality of tool grooves (330) may be formed on the outer surface of the second cylindrical portion (320). The tool grooves (330) are portions into which a tool, such as a wrench, is inserted, and the user can easily perform screw fastening between the cover member (300) and the receiving member (100) by rotating the cover member (300) using the tool.

At this time, the tool groove (330) can be formed long so as to have the same width (e2) in the horizontal direction, and for example, the width (e2) of the tool groove (330) can be designed to be 2 mm to 2.5 mm.

Fig. 6 is a drawing showing the state of coupling of a head and a shaft according to an embodiment of the present invention.

Referring to FIG. 6, the head (10) and shaft (20) according to the embodiment of the present invention can be combined through a connector (50) to complete a golf club (1) for use in a stadium.

First, the insertion member (200) provided on the shaft (20) can be inserted and coupled into the receiving member (100) of the head (10), and accordingly, the rotation prevention projection (220) provided on the body portion (210) can be inserted and coupled into the rotation prevention groove (112) provided on the base portion (110).

Thereafter, the cover member (300) is moved toward the head (10) and rotationally coupled with the receiving member (100), and the ring member (400) is moved toward the cover member (300) to closely support the area between the upper surface of the second cylindrical portion (320) of the cover member (300) and the shaft (20).

FIG. 7 is a drawing for explaining a method for manufacturing a test golf club according to an embodiment of the present invention. Hereinafter, a method for manufacturing a test golf club according to an embodiment of the present invention will be explained with reference to FIGS. 1 to 7, and any content overlapping with the above-described embodiment will be omitted for explanation.

Referring to FIG. 7, a method for manufacturing a golf club for a test shot according to an embodiment of the present invention may include a golf club preparation step (S10), a head and shaft separation step (S20), a head and shaft processing step (S20), a receiving member and insertion member installation step (S40), and a cover member fastening step (S50).

In the golf club preparation step (S10), a first golf club and a second golf club can be prepared. Here, the first golf club and the second golf club may refer to different golf clubs and existing commercial products. For example, the first golf club and the second golf club may be products from different manufacturers or may have different head weights, head angles, shaft materials, and shaft strengths. In this case, the first golf club is composed of a first head and a first shaft coupled to the first head, and the second golf club is composed of a second head and a second shaft coupled to the second head.

In the head and shaft separation step (S20), the first head and the first shaft of the first golf club can be separated, and the second head and the second shaft of the second golf club can be separated.

In the head and shaft processing step (S30), the head hole of the first head and the head hole of the second head are processed to increase the diameter, and a sanding process can be performed on the end portion of the first shaft and the end portion of the second shaft. As described above, the processing process for the head hole can be performed using a drilling device, and the processing process for the shaft can be performed using a belt sander. Accordingly, the end portion of the first shaft and the end portion of the second shaft are reduced in diameter, and the diameter of the end portion of each shaft can be set to 8.65 mm to 9.45 mm.

In the step of installing the receiving member and insert member (S40), the receiving member (100) can be installed in the head hole of the first head and the head hole of the second head, respectively, and the insert member (200) can be installed in the end portion of the first shaft and the end portion of the second shaft, respectively.

In the cover member fastening step (S50), the insertion member (200) of the second shaft is inserted and connected to the receiving member (100) of the first head, and then the cover member (300) is fastened to the receiving member (100) of the first head, and the insertion member (200) of the first shaft is inserted and connected to the receiving member (100) of the second head, and then the cover member (300) is fastened to the receiving member (100) of the second head, thereby completing the first and second golf clubs for the first and second shots, which are combined differently. In this step (S50), a ring member (400) can additionally be installed to the first and second golf clubs for the first and second shots, respectively.

Those skilled in the art will appreciate that the present invention can be implemented in other specific forms without altering its technical spirit or essential characteristics. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

1: Golf club for the city
10: Head
20: Shaft
30: Grip
100: Absence of acceptance
200: Insert member
300: Cover member
400: Ring absence

Claims (7)

head;
A receiving member installed inside the above head;
shaft;
An insertion member fixedly installed at the end of the shaft and inserted into the receiving member; and
A cover member positioned in a state fitted to the shaft and connected to the receiving member while the insertion member is inserted into the receiving member;
The above head and the above shaft,
It is characterized by different manufacturers,
The above-mentioned receiving member, the above-mentioned inserting member, and the above-mentioned covering member,
Each is characterized by being manufactured from different materials,
The above insert member is,
It is made of the same material as the above shaft,
The above acceptance absence is,
A base portion inserted into the head;
An anti-rotation groove formed on the bottom surface of the above base portion;
An extension formed to extend outward from the base portion;
A first screw structure formed on the outer surface of the extension portion; and
A flange portion formed protruding from the connecting portion of the base portion and the extension portion;
The above insert member is,
a body portion coupled to the end of the shaft; and
It includes a rotation prevention projection that is formed by protruding from the bottom surface of the body part and is inserted and coupled into the rotation prevention groove;
The above cover member,
A first cylindrical portion having a second screw structure formed on the inner surface thereof and screw-connected with the first screw structure of the extension portion;
A second cylindrical portion formed by extending from the first cylindrical portion; and
Including a plurality of tool grooves formed on the outer surface of the second cylindrical portion;
The basic diameter of the above shaft is set to 8.8 mm to 9.5 mm, and the diameter of the end of the shaft is set to 8.65 mm to 9.45 mm through a sanding process for the end of the shaft.
The length of the distal end of the above shaft is 20 mm to 26 mm,
A golf club for a test fit, characterized in that the total weight of the receiving member, the insertion member, and the cover member is 10 g to 14 g.
delete In the first paragraph,
The above-mentioned receiving member comprises an aluminum material,
The above insert member comprises a steel material,
The above cover member is a golf club for fitting a golf club containing a titanium material.
delete delete A step in which a manufacturer prepares different first and second golf clubs;
A step of separating the first head and the first shaft of the first golf club and separating the second head and the second shaft of the second golf club;
A step of increasing the diameter by machining the head hole of the first head and the head hole of the second head;
A step of performing a sanding process on the end portion of the first shaft and the end portion of the second shaft;
A step of installing a receiving member in each of the head hole of the first head and the head hole of the second head, and installing an insertion member in each of the end portion of the first shaft and the end portion of the second shaft; and
A step of inserting and connecting the insertion member of the second shaft into the receiving member of the first head, and then connecting the cover member to the receiving member of the first head, and then inserting and connecting the insertion member of the first shaft into the receiving member of the second head, and then connecting the cover member to the receiving member of the second head; including;
The above-mentioned receiving member, the above-mentioned insertion member, and the above-mentioned covering member are characterized in that they are each manufactured from different materials,
The above insert member is made of the same material as the installed shaft,
The basic diameters of the first shaft and the second shaft are set to 8.8 mm to 9.5 mm, respectively, and the diameters of the end portion of the first shaft and the end portion of the second shaft are set to 8.65 mm to 9.45 mm, respectively, through the sanding process.
The lengths of the distal end of the first shaft and the distal end of the second shaft are each 20 mm to 26 mm,
A method for manufacturing a golf club for a test shot, characterized in that the total weight of the receiving member of the first head, the insertion member of the second shaft, and the cover member connected to the receiving member of the first head is 10 g to 14 g, and the total weight of the receiving member of the second head, the insertion member of the first shaft, and the cover member connected to the receiving member of the second head is 10 g to 14 g.
delete