JP6186093B1 - Metal hollow golf club - Google Patents

Abstract

The diameter D2 of the inner peripheral hole 81 of the spacer 8 and the diameter D3 of the inner peripheral hole 92 of the cap 9 are formed larger than the diameter D1 of the inner peripheral hole 72 of the sleeve 7. At the tip of the golf shaft 6, only the entire length S portion in the axial direction of the inner peripheral hole 72 of the sleeve 7 is fixed, and is not fixed in the inner peripheral hole 81 of the spacer 8 and the inner peripheral hole 92 of the cap 9. A portion of the tip of the golf shaft 6 that exceeds the fixed portion upper end 73 is not restrained in the insertion hole of the hosel portion 3. The total length S in the axial direction of the inner peripheral hole 72 of the sleeve 7 is set to a length that can secure a sufficient adhesive strength that can withstand the striking force between the golf shaft 6 and the sleeve 7. It is possible to adjust the launch angle appropriately according to the head speed at the time of hitting which differs depending on the golfer, and it becomes possible to increase the launch angle and fly the ball far away.

Description

  The present invention relates to a metal hollow golf club. More specifically, it is possible to adjust the launch angle appropriately according to the head speed at the time of hitting which differs depending on the golfer, and it is possible to increase the launch angle at the time of hitting and to fly the ball far away. The present invention relates to a metal hollow golf club.

  The elements for hitting the ball far away are (1) increasing the initial velocity of the ball at the time of hitting, (2) increasing the launch angle of the ball at the time of hitting, and (3) the backspin amount of the ball being appropriate. Is a major factor. For golfers with a slow head speed (for example, less than 40 m / s), it is necessary to increase the ball launch angle by increasing the loft angle of the golf club at the time of hitting in order to fly the ball far. .

  FIG. 10 is a front view showing a part of the head body 100 of a conventional metal hollow golf club in cross section. As shown in FIG. 10, the head body 100 of a hollow golf club made of metal such as wood returns to the center of gravity 104 around the shaft 106, which is bent like 106 ′ before the player hits the ball. It rotates in the vertical direction, that is, the apparent loft angle is large just before hitting. Here, the “nominal loft angle” is a loft angle that is defined in a static state where the club is not swinged, whereas the “apparent loft angle” is the face that actually swings when the club swings. It is the loft angle in the dynamic state when hitting the ball. However, since the center of gravity L is deeper than that of an iron, the head swings slightly in the vertical direction due to the impact of the ball when the ball is hit, and swings to an angle α ′ that reduces the loft angle α (when stationary). The state is moved (α ′ <α). As shown in FIG. 10, the conventional golf shaft 106 is bonded and fixed with an epoxy resin or the like over the entire length of the insertion hole of the hosel portion 103. Generally, the hosel portion 103 is disposed considerably above the upper end portion of the face surface 102 (Patent Document 1, Patent Document 2, and Patent Document 3). Therefore, the upper end 107 of the adhering portion of the golf shaft 106 is disposed considerably above the hitting point (face center) 1021.

  If the fixed portion upper end 107 is considered as a fulcrum of the head main body 100, the ball is hit considerably below the fixed portion upper end 107. As a result, the head main body 100 slightly swings in the direction in which the loft angle α decreases due to the rotational moment of the head main body 100 due to the impact at the time of impact. The rotation of the head body 100 in both directions actually hits the ball with a loft angle α ′ smaller than the display loft angle. A golfer with a high head speed (for example, around 45 m / s) dislikes racing, so it is preferable that the loft angle α upon hitting is small.

  However, in the conventional metal hollow golf club, the upper end 107 of the adhering portion of the golf shaft 106 is disposed considerably above the hitting point (face center) 1021, so the loft angle α ′ at the time of hitting is increased. It was difficult. In addition, the shaft fixed by the adhesive and the upper end of the fastening part of the head are placed below the top of the top part of the head to reduce the head's vertical swing (top and sole direction) when hitting the ball. In addition, there has been proposed one in which the directionality of the hit ball is stabilized (Patent Document 4). However, in the method for fixing the shaft and the head described in Patent Document 4, the adhesive protrudes from the upper and lower sides of the shaft fixing hole of the head, which is a through hole, and it is impossible to accurately secure the adhesion region and the non-adhesion region.

JP 2006-42951 A JP 2006-204731 A JP 2004-329676 A JP 2001-276283 A

The present invention has been invented against the background as described above, and achieves the following objects. An object of the present invention is to provide a metal hollow golf club which can be adjusted to an appropriate launch angle in accordance with the head speed at the time of hitting which differs depending on the golfer.
Another object of the present invention is to provide a metal hollow golf club having a fixing method capable of precisely controlling a bonded area and a non-bonded area in fixing a head and a shaft.
Still another object of the present invention is to increase the launch angle of the ball by disposing the upper end of the fixed portion of the golf shaft close to the hitting point (face center), thereby enabling the ball to fly far. Another object of the present invention is to provide a metal hollow golf club.

The present invention employs the following means in order to solve the above problems.
That is, the metal hollow golf club of the present invention 1
A head body having a face surface for hitting a golf ball;
In the metal hollow golf club having a hosel part having an insertion hole fixed to the head body and having the insertion hole into which the tip of the golf shaft is inserted and fixed,
A golf shaft fixing means capable of fixing only the tip portion at an arbitrary position in the axial direction in the insertion hole is provided, and the golf shaft exceeding the upper end of the fixing portion of the tip portion is not in the insertion hole of the hosel portion. Ri restraint der,
The golf shaft fixing means includes a sleeve having the tip portion bonded to an inner peripheral hole with an adhesive and inserted into the insertion hole of the hosel portion,
The sleeve can selectively use a plurality of sleeves having different axial lengths,
The total length in the axial direction of the inner circumferential holes of the plurality of sleeves is formed to be the same length from the upper end surfaces of the plurality of sleeves.

The metal hollow golf club present invention 2, in the present invention 1, in contact with the upper end surface of the sleeve is inserted into the insertion hole of the hosel portion of a diameter larger than the inner peripheral hole of the tip and the sleeve A spacer having an inner circumferential hole; and an inner circumferential hole having a diameter larger than that of the inner circumferential hole of the tip portion and the sleeve, being inserted into the insertion hole of the hosel part in contact with the upper end surface of the spacer, The sleeve includes a cap that is screwed into the hosel portion to press and fix the sleeve and the spacer.

The metal hollow golf club of the present invention 3 is inserted into the insertion hole of the hosel part in contact with the upper end surface of the sleeve in the first aspect of the invention, and has a larger diameter than the front end part and the inner peripheral hole of the sleeve. A cap has an inner peripheral hole and is screwed into the hosel part to press and fix the sleeve.

The metal hollow golf club of the present invention 4 is inserted into the insertion hole of the hosel part in contact with the stepped surface of the sleeve formed below the upper end surface of the sleeve in the first aspect of the invention. And a cap for fixing the sleeve by pressing the stepped surface of the sleeve and screwing into the hosel portion. And

The metal hollow golf club of the present invention 5 is one selected from the first to fourth inventions, wherein the outer peripheral surface of the sleeve and the cross-sectional shape of the insertion hole of the hosel part are both the same polygon, Are engaged with each other.

  The metal hollow golf club of the present invention can be assembled by easily adjusting the distance between the hitting point (face center) and the upper end of the fixed portion of the golf shaft. As a result, it is possible to adjust the head launch angle in a direction that reduces the loft angle in a dynamic state, and to adjust the launch angle appropriately according to the head speed at the time of hitting that differs depending on the golfer. It was. Further, as a result of being able to arrange the striking point (face center) and the upper end of the fixed portion of the tip of the golf shaft very close to each other, the rotation of the head body in the direction of decreasing the loft angle can be suppressed to a small extent. Since the launch angle at the time of hitting can be increased, the ball can be thrown far away. Furthermore, the fixing structure of the head and shaft of the present invention can precisely control the bonded area and the non-bonded area as designed.

FIG. 1 is a partial cross-sectional front view showing a head main body of a metal hollow golf club according to a first embodiment of the present invention. FIG. 2 is an enlarged longitudinal sectional view showing the vicinity of the hosel part of the head main body of FIG. FIG. 3 is an exploded perspective view showing the vicinity of the hosel part of FIG. FIG. 4 is a view corresponding to FIG. 1 showing a head body of a metal hollow golf club according to a second embodiment of the present invention. FIG. 5 is an enlarged longitudinal sectional view showing the vicinity of the hosel part of the head main body of FIG. 6 is an exploded perspective view showing the vicinity of the hosel part of FIG. FIG. 7 is a view corresponding to FIG. 1 showing a head body of a metal hollow golf club according to a third embodiment of the present invention. FIG. 8 is an enlarged longitudinal sectional view showing the vicinity of the hosel part of the head body of FIG. FIG. 9 is an exploded perspective view showing the vicinity of the hosel part of FIG. FIG. 10 is a partial cross-sectional front view showing a head body of a conventional metal hollow golf club.

[First Embodiment of Metal Hollow Golf Club]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings. FIG. 1 is a front view showing a cross section of a part of a head body of a metal hollow golf club according to a first embodiment of the present invention, and FIG. 2 is an enlarged vertical cross section showing the vicinity of a hosel part of the head body of FIG. 3 and 3 are exploded perspective views showing the vicinity of the hosel part of FIG. The first embodiment is an example in which the head is adjusted so as to have a loft angle at the time of hitting suitable for a golfer having a relatively slow head speed (for example, less than 40 m / s).

The head main body 1 shown in FIGS. 1 to 3 is an example applied to a metal wood club, and the volume of the head main body 1 is 400 to 470 cm ³ . The head body 1 has a face surface 2 having a striking surface for hitting a ball on the front surface, a hosel portion 3 which is a shaft connecting portion on the shaft side, a crown portion 4 on the upper portion, and a sole portion 5 on the lower portion which is in contact with the ground. Then, one end of the golf shaft 6 is inserted and fixed to the hosel portion 3. The face surface 2, the hosel portion 3, the crown portion 4, and the sole portion 5 are formed by press-molding titanium or a titanium alloy, and are integrally formed by welding the respective edges to form a hollow head body 1. ing.

  The hosel part 3 is a hollow tube with a bottom, and has a disk-like collar part 31 at the upper part, and has a shaft-shaped cylindrical part 32 integrally with the collar part 31 at the lower part of the collar part 31. . The cylindrical portion 32 is formed to extend through the hollow portion of the head body 1 to the vicinity of the sole portion 5. In the axial center of the hosel part 3, an insertion hole composed of a female screw hole 33, a circular hole 34, and a regular octagonal hole 35 having a regular octagonal cross section is formed in this order from the upper end side.

  A sleeve 7 having a regular octagonal outer peripheral surface 71 having the same cross section is inserted into the regular octagonal hole 35 of the hosel portion 3, and is closely fitted and engaged. The sleeve 7 is prevented from rotating around the hosel portion 3. The total length M1 in the axial direction of the sleeve 7 of the first embodiment is the shortest in the three embodiments of the present invention. The sleeve 7 is bottomed. A cylindrical inner peripheral hole 72 is formed at the shaft center of the sleeve 7, and the tip of the golf shaft 6 is inserted into the inner peripheral hole 72, and the main material is adhered and fixed with an adhesive made of an epoxy resin. Yes. The diameter D1 of the inner peripheral hole 72 of the sleeve 7 is formed to be slightly larger than the diameter d of the front end portion of the golf shaft 6, and an adhesive is formed in the gap between the inner peripheral hole 72 and the outer peripheral surface of the front end portion of the golf shaft 6. Enters into the sleeve 7 to fix the tip end portion (lower end portion in the drawing) of the golf shaft 6 to the sleeve 7.

  A cylindrical spacer 8 is inserted into the circular hole 34 in the axial center of the hosel portion 3, and the lower end surface of the spacer 8 is in contact with the upper end surface of the sleeve 7. Further, a male screw 93 at the bottom of the cap 9 is screwed into the female screw hole 33 at the axial center of the hosel portion 3, and the lower end surface of the cap 9 is in contact with the upper end surface of the spacer 8. Therefore, the cap 9 presses the sleeve 7 through the spacer 8 to prevent the sleeve 7 from coming off the hosel portion 3. An annular rubber packing 91 is sandwiched between the end surface of the cap 9 and the upper end surface of the hosel part 3 to prevent water and dust from entering the insertion hole in the shaft center of the hosel part 3. Yes.

  The diameter D2 of the inner peripheral hole 81 of the spacer 8 and the diameter D3 of the inner peripheral hole 92 of the cap 9 are formed larger than the diameter D1 of the inner peripheral hole 72 of the sleeve 7. More specifically, a cylindrical gap is formed between the outer periphery of the golf shaft 6 and the inner peripheral hole 81 of the spacer 8 and the inner peripheral hole 92 of the cap 9. Therefore, only the total length S portion in the axial direction of the inner peripheral hole 72 of the sleeve 7 is fixed (adhered) to the tip portion of the golf shaft 6, and is fixed in the inner peripheral hole 81 of the spacer 8 and the inner peripheral hole 92 of the cap 9. Not (glued). In other words, the portion of the tip of the golf shaft 6 that exceeds the upper end of the adhering portion (the upper end surface of the sleeve 7) 73 is not restrained in the insertion hole of the hosel portion 3. The total length S in the axial direction of the inner peripheral hole 72 of the sleeve 7 is set to a length that can secure a sufficient adhesive strength that can withstand the striking force between the golf shaft 6 and the sleeve 7. In addition, since the cylindrical gap is formed between the spacer 8, the cap 9, and the outer peripheral surface of the golf shaft 6, the inner peripheral hole 81 of the spacer 8 allows the shaft 6 to be Since the side surface is supported, stress does not concentrate on the upper end of the fixing portion (the upper end surface of the sleeve 7) 73 at the tip end portion.

  FIG. 1 shows a state in which the head body 1 is placed on a horizontal plane so that the shaft 6 forms a reference lie angle. A horizontal line 22 passing through the hitting point (face center) 21 of the face surface 2 at the time of hitting the ball is drawn. Further, the intersection 62 between the upper end of the adhering portion (the upper end surface of the sleeve 7) 73 at the tip of the golf shaft 6 and the shaft axis 61 of the golf shaft 6 is obtained. Then, the intersection 62 is above the horizontal line 22, and the distance H1 between the horizontal line 23 passing through the horizontal line 22 and the horizontal line 22 passing through the striking point (face center) 21 is 0 to 15 mm (FIG. 1). It is within the range of In other words, the hitting point (face center) 21 and the fixed portion upper end 73 of the tip of the golf shaft 6 can be arranged very close to each other. In the golf club, a phenomenon in which centrifugal force is exerted by swing and the toe side is lowered occurs. Therefore, the distance (H1) at the time of hitting the ball is smaller than that at rest. In this example, the distance H1 is 0 to 0 when hit. 5 mm.

  As a result, the head main body 1 has a loft angle (loft angle at the time of striking) with the fixing portion upper end 73 as a fulcrum as compared to the rotation around the center of gravity of the head main body 1 in the direction in which the loft angle increases at the time of impact. The amount of rocking in the direction of decreasing can be kept extremely small. As a result, the ball is hit with a loft angle larger than the display loft angle (the loft angle at the time of hitting). Therefore, it is preferable for a golfer who can increase the launch angle at the time of hitting and has a relatively slow head speed (for example, less than 40 / s) because the ball can be thrown far away.

[Second Embodiment of Metal Hollow Golf Club]
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. 4 is a view corresponding to FIG. 1 showing a head body of a metal hollow golf club according to a second embodiment of the present invention, and FIG. 5 is an enlarged longitudinal sectional view showing the vicinity of a hosel portion of the head body of FIG. 6 is an exploded perspective view showing the vicinity of the hosel part of FIG. 5. The second embodiment shown in FIG. 4 to FIG. 6 has a loft angle at the time of hitting suitable for a golfer with an average head speed (for example, around 40 m / s), as compared with the first embodiment. This is an example adjusted. In the following description, the same parts as those of the first embodiment are denoted by the same reference numerals, and the description overlapping with that of the first embodiment is omitted.

  Similarly to the sleeve 7 of the first embodiment, the sleeve 701 of the second embodiment has a regular octagonal hole 35 in which the cross-sectional shape of the hosel part 3 has a regular octagonal outer peripheral surface 71 having the same cross section. Are closely fitted and engaged, and the sleeve 701 is prevented from rotating around the hosel portion 3. The sleeve 701 according to the second embodiment is formed such that the total length M2 in the axial direction is longer than the total length M1 in the axial direction of the sleeve 7 according to the first embodiment by the total length in the axial direction of the spacer 8. . The total length S in the axial direction of the cylindrical inner peripheral hole 72 at the axis of the sleeve 701 is formed to be the same length as the total length S in the axial direction of the inner peripheral hole 72 of the sleeve 7 of the first embodiment. . The front end portion (lower end portion in the drawing) of the golf shaft 6 is inserted into the inner peripheral hole 72, and the main material is bonded and fixed with an epoxy resin adhesive.

  In the second embodiment, the spacer 8 of the first embodiment is removed, and the lower end surface of the cap 9 screwed into the female screw hole 33 in the axial center of the hosel portion 3 comes into contact with the upper end surface of the sleeve 701. ing. Therefore, the cap 9 directly presses the sleeve 701 to prevent the sleeve 701 from coming off the hosel portion 3. An annular rubber packing 91 is sandwiched between the end surface of the cap 9 and the upper end surface of the hosel part 3 to prevent water and dust from entering the insertion hole in the shaft center of the hosel part 3. Yes.

  The diameter D3 of the inner peripheral hole 92 of the cap 9 is formed larger than the diameter D1 of the inner peripheral hole 72 of the sleeve 701. Therefore, only the entire length S portion in the axial direction of the inner peripheral hole 72 of the sleeve 701 is fixed (adhered) to the tip of the golf shaft 6, and is not fixed (adhered) in the inner peripheral hole 92 of the cap 9. That is, the portion of the golf shaft 6 beyond the fixed portion upper end (the upper end surface of the sleeve 701) 730 beyond the fixed portion is not restrained in the insertion hole of the hosel portion 3. As a result, the adhering portion upper end (the upper end surface of the sleeve 701) 730 is higher than the adhering portion upper end (the upper end surface of the sleeve 7) 73 of the metal hollow golf club of the first embodiment.

  FIG. 4 shows a state where the head body 1 is placed on a horizontal plane so that the shaft 6 forms a reference lie angle. A horizontal line 22 passing through the hitting point (face center) 21 of the face surface 2 at the time of hitting the ball is drawn. Further, an intersection 620 between the upper end of the adhering portion (the upper end surface of the sleeve 701) 730 and the shaft axis 61 of the golf shaft 6 is obtained. Then, this intersection 620 is above the horizontal line 22, and the distance H2 between this and the horizontal line 22 passing through the striking point (face center) 21 is about 15 to 25 mm (when stationary in FIG. 4). That is, the distance between the striking point (face center) 21 and the fixed portion upper end 730 at the tip of the golf shaft 6 may be arranged to be larger than that of the metal hollow golf club of the first embodiment. It has become possible.

  As a result, the amount by which the head body 1 swings in the direction in which the loft angle decreases with the fixed portion upper end 730 as a fulcrum at the time of impact can be made larger than that in the first embodiment. The ball is hit with a loft angle smaller than that of the first embodiment (the loft angle at the time of hitting). Therefore, it is possible to make the launch angle at the time of hitting smaller than that in the first embodiment, and it is preferable for a golfer having a relatively average head speed (for example, around 40 m / s) because it is an appropriate launch angle. .

[Third Embodiment of Metal Hollow Golf Club]
Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a view corresponding to FIG. 1 showing a head body of a metal hollow golf club according to a third embodiment of the present invention, and FIG. 8 is an enlarged longitudinal sectional view showing the vicinity of the hosel part of the head body of FIG. 9 is an exploded perspective view showing the vicinity of the hosel part of FIG. The metal hollow golf club of the third embodiment shown in FIGS. 7 to 9 has a higher head speed (for example, around 45 m / s) than the metal hollow golf club of the second embodiment. This is an example of adjusting to a suitable loft angle at the time of hitting. In the following description, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description overlapping with the above embodiment is omitted.

  Similar to the sleeve 7 of the first embodiment, the sleeve 702 of the third embodiment has a regular octagonal hole 35 in which the cross-sectional shape of the hosel part 3 has a regular octagonal outer peripheral surface 71 having the same cross-section. Are closely fitted and engaged, and the sleeve 702 is prevented from rotating around the hosel portion 3. The sleeve 702 of the third embodiment is formed such that the total length M3 in the axial direction is about half of the total length in the axial direction of the cap 9 than the total length M2 in the axial direction of the sleeve 701 of the second embodiment. Yes. Therefore, the upper end surface of the sleeve 702 is disposed about half the total axial length of the cap 9 from the upper end surface of the sleeve 701 according to the second embodiment. The total length S in the axial direction of the cylindrical inner peripheral hole 72 at the axis of the sleeve 702 is formed to be the same length as the total length S in the axial direction of the inner peripheral hole 72 of the sleeve 701 of the second embodiment. . The tip of the golf shaft 6 is inserted into the inner peripheral hole 72, and the main material is bonded and fixed with an epoxy resin adhesive.

  In the third embodiment, as in the second embodiment, the spacer 8 is removed, and the lower end surface of the cap 9 screwed into the female screw hole 33 in the axial center of the hosel portion 3 is the stepped surface of the sleeve 702. 740 is in contact. The step surface 740 is formed below the upper end surface of the sleeve 702. Accordingly, the cap 9 directly presses the sleeve 702 to prevent the sleeve 702 from coming off the hosel portion 3. An annular rubber packing 91 is sandwiched between the end surface of the cap 9 and the upper end surface of the hosel part 3 to prevent water and dust from entering the insertion hole in the shaft center of the hosel part 3. Yes.

  The diameter D3 of the inner peripheral hole 92 of the cap 9 is formed larger than the diameter D1 of the inner peripheral hole 72 of the sleeve 702. Therefore, only the entire length S portion in the axial direction of the inner peripheral hole 72 of the sleeve 702 is fixed (adhered) to the distal end portion of the golf shaft 6, and is not fixed (adhered) in the inner peripheral hole 92 of the cap 9. That is, the portion of the tip of the golf shaft 6 that exceeds the upper end of the adhering portion (the upper end surface of the sleeve 702) 731 is unconstrained in the insertion hole of the hosel portion 3. As a result, the upper end of the fixing portion (upper end surface of the sleeve 702) 731 is higher than the upper end of the fixing portion (upper end surface of the sleeve 701) 730 of the second embodiment.

  FIG. 7 shows a state in which the head body 1 is placed on a horizontal plane so that the golf shaft 6 forms a reference lie angle. A horizontal line 22 passing through the hitting point (face center) 21 of the face surface 2 at the time of hitting the ball is drawn. Further, an intersection 621 between the upper end of the adhering portion (the upper end surface of the sleeve 702) 731 at the tip of the golf shaft 6 and the shaft axis 61 of the golf shaft 6 is obtained. Then, this intersection point 621 is above the horizontal line 22, and the distance H3 between this and the horizontal line 22 passing through the striking point (face center) 21 is about 25 to 40 mm (when stationary in FIG. 7). That is, the distance between the striking point (face center) 21 and the fixed portion upper end 731 at the tip of the golf shaft 6 can be arranged farther than that in the second embodiment.

  As a result, at the time of striking, the amount by which the head body 1 rotates in the direction in which the loft angle decreases with the fixed portion upper end 731 as a fulcrum can be made larger than in the second embodiment. As a result, the ball is hit with a loft angle smaller than that in the second embodiment (loft angle at the time of hitting). Therefore, the launch angle at the time of hitting can be made smaller than that of the second embodiment, and it is preferable for a golfer with a high head speed (for example, around 45 m / s) because it becomes an appropriate launch angle that does not blow up.

  That is, the metal hollow golf club according to the embodiment of the present invention uses the same head body 1, selects an appropriate one from sleeves having different axial lengths, and adheres the golf shaft 6. Since it is possible to adjust the launch angle appropriately according to the head speed at the time of hitting which differs depending on the golfer, it is possible to easily adjust the launch angle and to reduce the manufacturing cost.

  Using a metal hollow golf club according to an embodiment of the present invention and a club of a comparative example, a hit test at a hit point (face center) 21 was performed. The following drivers and shafts were used in the experiment. The specifications of the driver and shaft of the embodiment of the present invention are as follows. For the impact test, an impact robot “Shot Robot 10” (Miyamae Co., Ltd. (head office: Osaka, Japan)) was used. The ball used for hitting is “EPON Tour F3” (Epon Golf Co., Ltd. (head office: Niigata Prefecture, Japan)). The test conditions for the striking robot are the same for the examples and comparative examples. Below are the specifications of the clubs used.

[Example Club]
Driver (EPON AK-26): Epon Co., Ltd. (head office: Niigata, Japan) Loft angle: 10.5 ° ± 1.0 °
Face angle: 0 ° ± 1.0 °
Lie angle: 58.0 ° ± 1.0 °
Distance (H): 17.32 mm (distance when the striking point and the horizontal line at the top of the bonded part are stationary)
Capacity: 460cc
Head mass: 194.0 g
Shaft: Tour AD 5S (Graphite Design Co., Ltd. (head office: Saitama, Japan))
[Clubs of Comparative Examples 1 and 2]
The driver is a general driver and has a long distance between the fulcrum and the hit point of the shaft, and the specification of the driver of the comparative example of the present invention is as follows. The club of the comparative example 1 is a general adjustable head, and the club of the comparative example 2 is a general through bore head.
Further, Comparative Examples 1 and 2 are of the prior art structure.
Driver (EPON AF-153): Epon Co., Ltd. (head office: Niigata, Japan) Loft angle: 10.5 ° ± 0.5 °
Face angle: 0 ° H (hook) 0.5 °
Lie angle: 60.0 ° ± 0.5 °
Distance (H): 39.60 mm (distance at rest between the hitting point and the horizontal line above the bonded portion)
Capacity: 460cc
Head mass: 198.0 g
Shaft (Comparative Example 1): Tour AD 5R1 (manufactured by Graphite Design Co., Ltd. (head office: Saitama, Japan))
Shaft (Comparative Example 2): Tour AD 5S (manufactured by Graphite Design Co., Ltd. (head office: Saitama, Japan))

  The numerical values shown in Table 1 are obtained by calculating an average value at the time of hitting 10 balls under the above conditions. As a result, as shown in Table 1, the head speed increased by 0.6 m / s with the shafts having the same length and the same length and the same length. This is interpreted as the fact that the lengths of both the clubs are the same, but the shaft becomes substantially longer due to the difference in the distance (H) and the flexibility is increased. Further, since the length increases, the shaft is easily bent, and the head speed does not decrease even with a hard shaft (see Example and Comparative Example 1). Furthermore, since the distance between the intersections 62, 620, and 621 (see FIGS. 1, 4, and 7) between the upper end of the fixed portion of the golf shaft 6 and the shaft axis 61 and the center of gravity of the head is closer, the vertical direction of the head during hitting Oscillation in the (top, sole direction) is reduced, and the directionality of the hit ball is stabilized. Furthermore, the loft angle (different from that at rest) when receiving impact at the time of impact is increased (see Example and Comparative Example 2), and the vertical launch angle is increased (see Table 1). In the golf club, the phenomenon that centrifugal force acts and the toe side lowers due to the swing occurs, and therefore the distance (H) at the time of hitting the ball is smaller than that at rest.

  In the above embodiment, since the tip of the golf shaft 6 is bonded to the sleeve 7, a desired accurate distance (H 1 to H 3) can be secured by the length of the sleeve 7. Moreover, since the golf shaft 6 and the sleeve 7 can be taken out from the hosel part 3, workability | operativity improves when performing an adhesion | attachment operation | work. Furthermore, since the sleeve 7 is detachable from the hosel part 3, shafts having different distances (H) can be freely exchanged. Note that the sleeve 7 and the hosel portion 3 may be fixed by an adhesive instead of a mechanical clamp as in the above-described embodiment.

[Other embodiments]
Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment. For example, in the above-described embodiment, three types of sleeves having different axial lengths are selected according to the golfer's head speed. However, the types of sleeves having different axial lengths may be increased so that the launch angle can be adjusted more finely. In the above-described embodiment, the spacer and the cap are each one type (the spacer is only in the first embodiment), but the length of the axial direction depends on the axial length of the sleeve to be selected. A plurality of different types of spacers and caps may be selected. Further, the shaft may be directly bonded to the hosel part without using the sleeve.

1 ... Head body 2 ... Face surface 21 ... Hit point (face center)
22 ... Horizontal line 23 ... Horizontal line 3 ... Hosel part 31 ... Bridge part 32 ... Cylindrical part 33 ... Female threaded hole 34 ... Circular hole 35 ... Regular octagonal hole 4 ... Crown part 5 ... Sole part 6 ... Golf shaft 61 ... Shaft axis 62 ... Intersection 620 ... Intersection 621 ... Intersection 7 ... Sleeve 701 ... Sleeve 702 ... Sleeve 71 ... Outer peripheral surface 72 ... Inner peripheral hole 73 ... Upper end of the fixing portion (upper end surface of the sleeve 7)
730 ... Adhering portion upper end (upper end surface of the sleeve 701)
731 ... Adhering portion upper end (upper end surface of sleeve 702)
740: Stepped surface 8 ... Spacer 81 ... Inner peripheral hole 9 ... Cap 91 ... Packing 92 ... Inner peripheral hole 93 ... Male screw 100 ... Head body 102 ... Face surface 1021 ... Impact point (face center)
103 ... hosel portion 104 ... center of gravity 106 ... golf shaft 107 ... upper end of the fixing portion

Claims (5)

A head body having a face surface for hitting a golf ball;
In the metal hollow golf club having a hosel part having an insertion hole fixed to the head body and having the insertion hole into which the tip of the golf shaft is inserted and fixed,
A golf shaft fixing means capable of fixing only the tip portion at an arbitrary position in the axial direction in the insertion hole is provided, and the golf shaft exceeding the upper end of the fixing portion of the tip portion is not in the insertion hole of the hosel portion. Restraint,
The golf shaft fixing means includes a sleeve having the tip portion bonded to an inner peripheral hole with an adhesive and inserted into the insertion hole of the hosel portion,
The sleeve can selectively use a plurality of sleeves having different axial lengths,
The metal hollow golf club, wherein the total length of the inner peripheral holes of the plurality of sleeves in the axial direction is the same length from the upper end surface of the plurality of sleeves. The metal hollow golf club according to claim 1,
A spacer that is inserted into the insertion hole of the hosel part in contact with the upper end surface of the sleeve, and has an inner peripheral hole having a larger diameter than the inner peripheral hole of the tip part and the sleeve;
The sleeve is inserted into the insertion hole of the hosel part in contact with the upper end surface of the spacer, has an inner peripheral hole having a diameter larger than the inner peripheral hole of the tip part and the sleeve, and is screwed into the hosel part, and the sleeve And a cap for pressing and fixing the spacer. A metal hollow golf club, comprising: The metal hollow golf club according to claim 1,
The sleeve is brought into contact with the upper end surface of the sleeve and inserted into the insertion hole of the hosel part, and has an inner peripheral hole having a diameter larger than that of the tip part and the inner peripheral hole of the sleeve, and is screwed into the hosel part, A metal hollow golf club characterized by comprising a cap for pressing and fixing. The metal hollow golf club according to claim 1,
An inner peripheral hole having a diameter larger than that of the tip end portion and the inner peripheral hole of the sleeve is inserted into the insertion hole of the hosel portion in contact with the stepped surface of the sleeve formed below the upper end surface of the sleeve. A metal hollow golf club comprising: a cap that is screwed into the hosel part and presses the stepped surface of the sleeve to fix the sleeve. The metal hollow golf club according to claim 1, wherein the metal hollow golf club is selected from claims 1 to 4.
The metal hollow golf club characterized in that the outer peripheral surface of the sleeve and the cross-sectional shape of the insertion hole of the hosel part are both the same polygon, and both are engaged.

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