WO2017073705A1

WO2017073705A1 - Hollow golf club made of metal

Info

Publication number: WO2017073705A1
Application number: PCT/JP2016/081984
Authority: WO
Inventors: 落合　健二
Original assignee: 株式会社遠藤製作所
Priority date: 2015-10-28
Filing date: 2016-10-28
Publication date: 2017-05-04
Also published as: JP6186093B1; KR20180067663A; KR102023291B1; JP2017170199A; JPWO2017073705A1; CN108348807B; JP6368827B2; CN108348807A

Abstract

According to the present invention, the diameter D2 of an inner circumferential hole 81 of a spacer 8 and the diameter D3 of an inner circumferential hole 92 of a cap 9 are each formed to be larger than the diameter D1 of an inner circumferential hole 72 of a sleeve 7. The leading end of a golf shaft 6 is fixed only by a portion thereof ranging over an overall length S, in the axial direction, of the inner circumferential hole 72 of the sleeve 7, and is not fixed in the inner circumferential hole 81 of the spacer 8 or the inner circumferential hole 92 of the cap 9. A portion above a fixed-section upper end 73 of the leading end of the golf shaft 6 is not restrained in an insertion hole of a hosel part 3. The overall length S, in the axial direction, of the inner circumferential hole 72 of the sleeve 7 is set to such a length that can ensure, between the golf shaft 6 and the sleeve 7, strength of adhesion sufficient to endure hitting forces. The launch angle can be adjusted to a proper angle in accordance with a head speed, which varies depending on the golfer, at the moment of hitting, and a ball can be hit to the far distance by increasing the launch angle.

Description

Metal hollow golf club

The present invention relates to a metal hollow golf club. More specifically, the golfer made it possible to adjust to an appropriate launch angle according to the head speed at the time of hitting different for each golfer, and also made it possible to fly the ball far by enlarging the launch angle at the strike. The present invention relates to a metal hollow golf club.

Elements to hit the ball far are as follows: (1) increase the initial speed of the ball at the time of impact, (2) increase the launch angle of the ball at the time of impact, (3) appropriate amount of backspin of the ball , Etc. is a major factor. For a golfer with a low head speed (for example, less than 40 m / s), in order to fly the ball far, it is necessary to increase the loft angle of the golf club at the time of hitting and to increase the launch angle of the ball. .

FIG. 10 is a front view partially showing in cross section a head body 100 of a conventional metal hollow golf club. As shown in FIG. 10, the head body 100 of a metal hollow golf club such as wood returns the deflection of the bent shaft 106 as shown by 106 'before the player strikes the ball, and returns around the center of gravity 104 It rotates up and down, that is, the apparent loft angle immediately before striking is large. Here, the "nominal loft angle" is a loft angle defined in a static state in which the club is not swung, whereas the "apparent loft angle" is a club swing and the face is actually in impact. It is a loft angle in a dynamic state when hitting a ball to a ball. However, since the depth of gravity L is deeper in wood than in iron, when the ball is hit, the head slightly swings in the vertical direction due to ball impact, and swings to an angle α ′ where the loft angle α (at rest) decreases. It will be in the moved state (α ′ <α). Further, as shown in FIG. 10, the conventional golf shaft 106 is adhered and fixed with an epoxy resin or the like over the entire length of the insertion hole of the hosel portion 103. The hosel portion 103 is generally disposed substantially above the upper end portion of the face surface 102 (Patent Document 1, Patent Document 2, Patent Document 3). Therefore, the fixed portion upper end 107 of the golf shaft 106 is disposed considerably above the striking point (face center) 1021.

When the fixed portion upper end 107 is considered as a fulcrum of the head main body 100, the ball is hit considerably lower than the fixed portion upper end 107. As a result, the head body 100 slightly swings in the direction in which the loft angle α becomes smaller due to the rotational moment of the head body 100 due to the impact upon impact. The rotation of the head body 100 in both directions actually strikes the ball at a loft angle α ′ smaller than the display loft angle. A golfer who has a high head speed (for example, around 45 m / s) does not like blowing up, so it is preferable that the loft angle α at the time of hitting be small.

However, in the conventional metal hollow golf club, since the fixed portion upper end 107 of the golf shaft 106 is disposed considerably above the striking point (face center) 1021, the loft angle α 'at the time of striking is increased. Was difficult. In addition, the upper end of the fixing part of the shaft and head fixed with adhesive is located below the top of the top of the head to reduce the vertical swing (top, sole direction) of the head when hitting a ball. It has also been proposed that the directionality of the hit ball is stabilized (Patent Document 4). However, in the method of 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 the through hole, and it is not possible to exactly secure the bonding area and the non-bonding area.

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

The present invention was invented in the background as described above, and achieves the following object. SUMMARY OF THE INVENTION 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 varies depending on the golfer.
Another object of the present invention is to provide a metal hollow golf club which has a bonding method capable of precisely controlling the bonding area and the non-bonding area in bonding the head and the shaft.
Still another object of the present invention is to arrange the upper end of the fixed part of the golf shaft close to the striking point (face center), thereby making it possible to fly the ball far by enlarging the launch angle of the ball. The present invention is to provide a metal hollow golf club.

The present invention takes the following means in order to solve the problems.
That is, the metal hollow golf club of the present invention 1 has a head body provided with a face surface for striking a golf ball, and a hosel portion fixed to the head body and having an insertion hole into which the tip of the golf shaft is inserted and fixed. And a golf shaft fixing means capable of fixing only the distal end portion at an arbitrary position in the axial direction in the insertion hole, and the golf shaft extending beyond the upper end of the fixed portion of the distal end portion It is characterized in that it is unrestrained in the insertion hole of the hosel part.

In the metal hollow golf club according to the second aspect of the present invention, in the golf shaft fixing means according to the first aspect, the front end portion is adhered to the inner circumferential hole with an adhesive and the sleeve inserted into the insertion hole of the hosel portion. The sleeve can selectively use a plurality of sleeves having different axial overall lengths, and the axial overall lengths of the inner peripheral holes of the plurality of sleeves are the same length from the upper end surface of the plurality of sleeves. It is characterized in that it is formed.

In the metal hollow golf club of the third aspect of the present invention, in the second aspect of the present invention, the metal hollow golf club is inserted into the insertion hole of the hosel portion in contact with the upper end surface of the sleeve, A spacer having an inner peripheral hole, and an inner peripheral hole having a diameter larger than the inner peripheral hole of the tip and the sleeve, inserted into the insertion hole of the hosel portion in contact with the upper end surface of the spacer; It is characterized in that it is screwed into a hosel portion and has a cap for pressing and fixing the sleeve and the spacer.

In the metal hollow golf club of the fourth aspect of the present invention, in the second aspect of the present invention, the metal hollow golf club is inserted into the insertion hole of the hosel portion in contact with the upper end surface of the sleeve, It has an inner circumferential hole, and is screwed into the hosel part, and is characterized by including a cap for pressing and fixing the sleeve.

In the metal hollow golf club according to the fifth aspect of the present invention, in the second aspect, the metallic hollow golf club is inserted into the insertion hole of the hosel portion in contact with the step surface of the sleeve formed below the upper end surface of the sleeve And an inner peripheral hole having a diameter larger than that of the inner peripheral hole of the sleeve, and screwed into the hosel portion to press a stepped surface of the sleeve to fix the sleeve. I assume.

In the metal hollow golf club of the sixth invention, in one selected from the first to fifth inventions, the cross-sectional shapes of the outer peripheral surface of the sleeve and the insertion hole of the hosel portion are both the same polygon. Are engaged.

A metal hollow golf club according to a seventh aspect of the invention is a metal hollow golf club having a head body provided with a face surface for striking a golf ball, and a hosel part fixed to the head body and for fixing a golf shaft. When the tubular sleeve for fixing the golf shaft is disposed and fixed in the insertion hole of the hosel and the head body is placed on a horizontal surface so that the golf shaft makes a lie angle of the reference, the shaft tip portion The intersection point of the upper end of the fixed portion and the shaft axis is substantially above the horizontal line passing through the face center which is the striking point of the face surface and located in the sleeve and fixed in the hosel portion The tip end of the shaft is inserted into the inner peripheral hole of the sleeve and fixed with an adhesive, and the upper surface of the sleeve is The golf shaft exceeding is characterized by an unconstrained within the insertion hole of the hosel portion.

In the metal hollow golf club of the eighth invention according to the seventh invention, the head body has a volume of 400 to 470 cm ³ and a horizontal line passing through a face center which is a striking point, and an upper end of a fixing portion of the shaft tip. A distance between a horizontal line passing through an intersection with the shaft axis and the horizontal line may be 0 to 15 mm.

In the metal hollow golf club of the ninth invention according to the seventh or eighth invention, the metal hollow golf club is inserted into the insertion hole of the hosel portion in contact with the upper end surface of the sleeve and larger than the tip portion and the inner circumferential hole of the sleeve. A spacer having an inner peripheral hole of a diameter, and is inserted into the insertion hole of the hosel portion in contact with the upper end surface of the spacer and has an inner peripheral hole larger in diameter than the inner peripheral hole of the tip and the sleeve And a cap screwed into the hosel portion to press and fix the sleeve and the spacer.

In the metal hollow golf club according to the tenth aspect of the present invention, in any one of the seventh to ninth aspects of the present invention, the cross-sectional shapes of the outer peripheral surface of the sleeve and the insertion hole of the hosel portion are the same polygon. Are engaged.

The metal hollow golf club of the present invention can be assembled by simply adjusting the distance between the striking point (face center) and the upper end of the fixed portion of the tip of the golf shaft. As a result, it is possible to adjust the rotation of the head main body in the direction in which the loft angle in the dynamic state becomes smaller, and to adjust the launch angle to an appropriate angle according to the head speed at the time of hitting different by the golfer. The Further, as a result that it becomes possible to arrange the striking point (face center) and the upper end of the fixed portion of the tip of the golf shaft extremely close, rotation of the head main body in the direction in which the loft angle becomes smaller can be suppressed small. Since the striking angle at the time of hitting can be increased, it becomes possible to fly the ball far. Furthermore, the head and shaft fixing structure of the present invention can precisely control the bonding area and the non-bonding area as designed.

FIG. 1 is a front view, partly in cross section, showing a head body of a metal hollow golf club according to a first embodiment of the present invention. FIG. 2 is an enlarged vertical sectional view showing the vicinity of the hosel portion of the head main body of FIG. FIG. 3 is an exploded perspective view showing the vicinity of the hosel portion 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 vertical sectional view showing the vicinity of the hosel portion of the head main body of FIG. 6 is an exploded perspective view showing the vicinity of the hosel portion 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 vertical sectional view showing the vicinity of the hosel portion of the head main body of FIG. FIG. 9 is an exploded perspective view showing the vicinity of the hosel portion of FIG. FIG. 10 is a front view, partly in cross section, showing a head body of a conventional metal hollow golf club.

[First Embodiment of Metal Hollow Golf Club]
Hereinafter, a first embodiment of the present invention will be described based on the drawings. FIG. 1 is a front view partially showing a head body of a metal hollow golf club according to a first embodiment of the present invention, and FIG. 2 is an enlarged longitudinal sectional view showing the vicinity of a hosel portion of the head body of FIG. FIG. 3 is an exploded perspective view showing the vicinity of the hosel portion of FIG. The first embodiment is an example adjusted to have a loft angle at impact suitable for a golfer with a relatively low 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 striking a ball in the front, a hosel portion 3 as 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 contacting the ground. One end of the golf shaft 6 is inserted into 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-forming titanium or a titanium alloy, and their respective edge portions are welded to form integrally, forming a hollow head body 1 ing.

The hosel portion 3 is a hollow tubular with a bottom, and has a disk-like collar 31 at the upper part, and has an axial cylindrical portion 32 integrally with the collar 31 at the lower part of the collar 31 . The cylindrical portion 32 is formed to extend through the hollow portion of the head main body 1 to the vicinity of the sole portion 5. The axial center of the hosel portion 3 is formed with 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 in this order from the upper end side.

A sleeve 7 having an outer circumferential surface 71 having the same regular octagonal cross section is inserted into the regular octagonal hole 35 of the hosel portion 3 and closely fitted and engaged, and the sleeve 7 is rotationally locked to the hosel portion 3. The overall axial length M1 of the sleeve 7 of the first embodiment is the shortest of the three embodiments of the present invention. The sleeve 7 is bottomed. A cylindrical inner circumferential hole 72 is formed at the axial center of the sleeve 7, the tip of the golf shaft 6 is inserted into the inner circumferential hole 72, and the main material is adhered and fixed with an adhesive made of epoxy resin. There is. The diameter D1 of the inner circumferential hole 72 of the sleeve 7 is formed slightly larger than the diameter d of the tip of the golf shaft 6, and the adhesive is formed in the gap between the inner circumferential hole 72 and the outer circumferential surface of the tip of the golf shaft 6. Enters and secures the tip (lower end in the figure) of the golf shaft 6 to the sleeve 7.

The cylindrical spacer 8 is inserted into the circular hole 34 of 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, the lower external thread 93 of the cap 9 is screwed into the female screw hole 33 of the axial center of the hosel portion 3, and the lower end face of the cap 9 is in contact with the upper end face of the spacer 8. Accordingly, the cap 9 presses the sleeve 7 via 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 face of the cap 9 and the upper end face of the hosel portion 3 to prevent water and dust from entering the axial center insertion hole of the hosel portion 3. There is.

The diameter D2 of the inner circumferential hole 81 of the spacer 8 and the diameter D3 of the inner circumferential hole 92 of the cap 9 are larger than the diameter D1 of the inner circumferential 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 entire axial length S of the inner peripheral hole 72 of the sleeve 7 is fixed (bonded) to the tip 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 are fixed. It is not (bonded). That is, the portion beyond the fixed portion upper end (upper end surface of the sleeve 7) 73 of the tip end portion of the golf shaft 6 is unrestrained in the insertion hole of the hosel portion 3. The axial overall length S of the inner circumferential hole 72 of the sleeve 7 is set to a length that can ensure sufficient adhesive strength between the golf shaft 6 and the sleeve 7 to withstand the striking force. Further, by forming the cylindrical gap between the spacer 8, the cap 9 and the outer peripheral surface of the golf shaft 6, even if the golf shaft 6 is enlarged, the inner peripheral hole 81 of the spacer 8 Since the side surface is supported, stress does not concentrate on the upper end 73 (upper end surface of the sleeve 7) of the fixed portion of the tip.

FIG. 1 shows a state in which the head main body 1 is placed on a horizontal surface so that the shaft 6 forms a reference lie angle. A horizontal line 22 passing through the striking point (face center) 21 of the face surface 2 when striking the ball is drawn. Further, an intersection point 62 between the upper end (the upper end surface of the sleeve 7) 73 of the fixed portion of the tip end portion of the golf shaft 6 and the shaft axis 61 of the golf shaft 6 is determined. Then, this intersection point 62 is above the horizontal line 22, and the distance H1 between the horizontal line 23 passing through it and the horizontal line 22 passing the striking point (face center) 21 is 0 to 15 mm in this embodiment (FIG. 1). It falls within the range of stationary). That is, it becomes possible to arrange the striking point (face center) 21 and the upper end 73 of the fixed portion of the tip of the golf shaft 6 in close proximity. It is to be noted that since the golf club has a centrifugal force acting to lower the toe side due to the swing, the above distance (H1) at the time of hitting the ball becomes smaller than at the time of rest. It will be 5 mm.

As a result, compared to the rotation around the center of gravity of the head main body 1 in the direction in which the loft angle becomes larger at the time of hitting, the loft angle (loft angle at the time of hitting) The amount of swinging in the direction of decreasing can be kept extremely small. As a result, the ball is hit at a loft angle (a loft angle at impact) larger than the display loft angle. Therefore, it is possible to increase the launch angle at the time of impact, which is preferable for a golfer with a relatively low head speed (e.g., less than 40 / s) because it is possible to fly the ball far.

Second Embodiment of Metal Hollow Golf Club
Hereinafter, a second embodiment of the present invention will be described based on 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 the hosel portion of the head body in FIG. 6 is an exploded perspective view showing the area near the hosel of FIG. The second embodiment shown in FIGS. 4 to 6 has a loft angle at the time of hitting that is more suitable for a golfer with an average head speed (for example, around 40 m / s) than the first embodiment. It is an example adjusted to 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 the first embodiment is omitted.

Similar to the sleeve 7 of the first embodiment, the sleeve 701 of the second embodiment is a sleeve 701 having an outer circumferential surface 71 having a regular octagonal cross section with a regular octagonal hole 35 in cross section of the hosel portion 3. Are closely fitted and engaged, and the sleeve 701 is locked to the hosel portion 3. In the sleeve 701 of the second embodiment, the overall axial length M2 is formed longer by the overall axial length of the spacer 8 than the overall axial length M1 of the sleeve 7 of the first embodiment. . The axial total length S of the cylindrical inner circumferential hole 72 of the axial center of the sleeve 701 is formed to be the same length as the axial total length S of the inner circumferential hole 72 of the sleeve 7 of the first embodiment. . The tip end portion (lower end portion in the drawing) of the golf shaft 6 is inserted into the inner circumferential hole 72, and the main material is adhered and fixed by an adhesive of epoxy resin.

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 of the axial center of the hosel portion 3 contacts the upper end surface of the sleeve 701. ing. Accordingly, 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 face of the cap 9 and the upper end face of the hosel portion 3 to prevent water and dust from entering the axial center insertion hole of the hosel portion 3. There is.

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

FIG. 4 shows a state in which the head main body 1 is placed on a horizontal surface so that the shaft 6 makes a reference lie angle. A horizontal line 22 passing through the striking point (face center) 21 of the face surface 2 when striking the ball is drawn. Further, an intersection point 620 between the upper end of the fixed portion (upper end surface of the sleeve 701) 730 of the tip end portion of the golf shaft 6 and the shaft axis 61 of the golf shaft 6 is determined. Then, this intersection point 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 (at rest in FIG. 4). That is, the distance between the striking point (face center) 21 and the upper end 730 of the fixed portion of the tip of the golf shaft 6 may 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 can be made larger than that in the first embodiment when striking. The ball is hit at a loft angle (a loft angle at impact) smaller than that of the first embodiment. Therefore, the launch angle at the time of hitting can be made smaller than in the first embodiment, which is preferable for a golfer with a relatively average head speed (for example, around 40 m / s), since the launch angle is appropriate. .

Third Embodiment of Metal Hollow Golf Club
Hereinafter, a third embodiment of the present invention will be described based on the drawings. 7 is a view corresponding to FIG. 1 showing the 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 portion of the head body in FIG. 9 is an exploded perspective view showing the vicinity of the hosel portion of FIG. The metal hollow golf club of the third embodiment shown in FIGS. 7 to 9 has a head speed faster (for example, around 45 m / s) than the metal hollow golf club of the second embodiment. This is an example adjusted to be a suitable loft angle at impact. In the following description, the same parts as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof will not be repeated.

Similar to the sleeve 7 of the first embodiment, the sleeve 702 of the third embodiment has a sleeve 702 having an outer circumferential surface 71 having a regular octagonal cross section with a regular octagonal hole 35 in cross section of the hosel portion 3. Are closely fitted and engaged, and the sleeve 702 is locked to the hosel portion 3. In the sleeve 702 of the third embodiment, the overall length M3 in the axial direction is formed to be about half the overall length in the axial direction of the cap 9 than the overall length M2 in the axial direction of the sleeve 701 in the second embodiment. There is. Accordingly, the upper end surface of the sleeve 702 is disposed about half the axial length of the cap 9 above the upper end surface of the sleeve 701 of the second embodiment. The axial total length S of the cylindrical inner circumferential hole 72 of the axial center of the sleeve 702 is formed to be the same length as the axial total length S of the inner circumferential hole 72 of the sleeve 701 according to the second embodiment. . The tip of the golf shaft 6 is inserted into the inner circumferential hole 72, and the main material is adhered and fixed by an adhesive of epoxy resin.

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 of the axial center of the hosel portion 3 is a stepped surface of the sleeve 702. I am in contact with 740. The stepped surface 740 is formed below the upper end surface of the sleeve 702. Therefore, 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 face of the cap 9 and the upper end face of the hosel portion 3 to prevent water and dust from entering the axial center insertion hole of the hosel portion 3. There is.

The diameter D3 of the inner circumferential hole 92 of the cap 9 is larger than the diameter D1 of the inner circumferential hole 72 of the sleeve 702. Accordingly, only the entire axial length S of the inner circumferential hole 72 of the sleeve 702 is fixed (bonded) to the tip of the golf shaft 6, and is not fixed (bonded) within the inner peripheral hole 92 of the cap 9. That is, the portion beyond the fixed portion upper end (upper end surface of the sleeve 702) 731 of the tip end portion of the golf shaft 6 is unrestrained in the insertion hole of the hosel portion 3. As a result, the fixed portion upper end (upper end surface of the sleeve 702) 731 is higher than the fixed portion upper end (upper end surface) 730 of the second embodiment.

FIG. 7 shows a state in which the head main body 1 is placed on a horizontal surface so that the golf shaft 6 forms a reference lie angle. A horizontal line 22 passing through the striking point (face center) 21 of the face surface 2 when striking the ball is drawn. Further, an intersection point 621 between the upper end of the fixed portion (upper end face of the sleeve 702) 731 of the end portion of the golf shaft 6 and the shaft axis 61 of the golf shaft 6 is determined. 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 (at rest in FIG. 7). That is, it is possible to arrange the distance between the impact point (face center) 21 and the fixed portion upper end 731 of the tip end portion of the golf shaft 6 more apart than in the second embodiment.

As a result, 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 that in the second embodiment when striking. As a result, the ball is hit at a loft angle (a loft angle at impact) smaller than that of the second embodiment. Therefore, the launch angle at the time of hitting can be made smaller than that of the second embodiment, which is preferable for a golfer with a high head speed (for example, around 45 m / s) because the launch angle is not appropriate.

That is, the metal hollow golf club according to the embodiment of the present invention only uses the same head body 1 and selects appropriate ones from sleeves having different axial lengths to bond the golf shaft 6, Since it is possible to adjust to an appropriate launch angle according to the head speed at the time of hitting which varies depending on the golfer, adjustment of the launch angle is easy and manufacturing cost can be reduced.

Using the metal hollow golf club of the embodiment of the present invention and the club of the comparative example, a batt test (face center) 21 was performed. The driver and shaft used in the experiment were as follows. The specifications of the driver and shaft in the embodiment of the present invention are as follows. For the impact test, an impact robot "Shot Robo 10" (manufactured by Miyamae Co., Ltd. (Head office: Osaka Prefecture, Japan)) was used. The ball used for hitting is "EPON Tour F3" (Epon Golf Co., Ltd. (Head office: Niigata Prefecture, Japan)). The test conditions of the striking robot are the same as in the embodiment and the comparative example. Below are the specifications of the club used.

[Example club]
Driver (EPON AK-26): EPON Co., Ltd. (Head office: Niigata Prefecture, Japan) Loft angle: 10.5 ° ± 1.0 °
Face angle: 0 ° ± 1.0 °
Lie angle: 58.0 ° ± 1.0 °
Distance (H): 17.32 mm (the distance at rest between the striking point and the horizontal line at the top of the bond)
Capacity: 460cc
Head mass: 194.0 g
Shaft: Tour AD 5S (graphite design, Inc. (Head office: Saitama Prefecture, Japan))
[Club of Comparative Examples 1 and 2]
The driver is a general driver, the distance between the fulcrum of the shaft and the hit point is long, and the specifications of the driver of the comparative example of the present invention are as follows. The club of Comparative Example 1 is a general adjustable head, and the club of 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 Prefecture, 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 (the distance at rest between the striking point and the horizontal line at the top of the bond)
Capacity: 460cc
Head mass: 198.0 g
Shaft (Comparative Example 1): Tour AD 5R1 (Graphite Design Co., Ltd. (Head office: Saitama Prefecture, Japan))
Shaft (Comparative Example 2): Tour AD 5S (manufactured by Graphite Design Co., Ltd. (Head office: Saitama Prefecture, Japan))

The numerical values shown in Table 1 are values obtained by obtaining an average value when 10 balls were hit under the above conditions. As a result, as shown in Table 1, the head speed was increased by 0.6 m / s with shafts having the same length and material and the same length. This is interpreted that although the overall lengths of both clubs are the same, the difference in the distance (H) substantially increases the length of the shaft and increases the flexibility. In addition, since the length is increased, the shaft tends to be bent, and even with a hard shaft (see the example and the comparative example 1), the head speed does not decrease. Furthermore, since the distance between the point of

intersection

62, 621, 621 (see FIGS. 1, 4 and 7) of the fixed portion upper end of the golf shaft 6 and the shaft axis 61 (see FIGS. Swinging in the direction of the top and sole is reduced, and the directionality of the hitting ball is stabilized. Furthermore, the loft angle (different from that in the stationary state) when impacted at impact is increased (see Examples and Comparative Example 2), and the upper and lower launch angles are increased (see Table 1). It is to be noted that since the golf club has a phenomenon in which centrifugal force acts to lower the toe side due to swing, the distance (H) at the time of hitting the ball becomes smaller than that at the time of rest.

In the above embodiment, since the tip of the golf shaft 6 is adhered to the sleeve 7, a desired accurate distance (H1 to H3) can be secured by the length of the sleeve 7. Further, since the golf shaft 6 and the sleeve 7 can be taken out from the hosel portion 3, the workability is improved when the bonding operation is performed. Furthermore, since the sleeve 7 is detachable from the hosel part 3, shafts having different distances (H) can be freely replaced. The fixing of the sleeve 7 and the hosel portion 3 may be performed by an adhesive instead of the mechanical clamp as in the embodiment described above.

[Other Embodiments]
As mentioned above, although embodiment of this invention was described, this 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 head speed of the golfer. However, the types of sleeves with different axial lengths may be increased to enable finer adjustment of the launch angle. In the embodiment described above, the spacer and the cap are each one type (the spacer is the first embodiment only), but the axial length of the sleeve is selected according to the axial length of the sleeve to be selected. Different types of spacers and caps may be selected. Also, the shaft may be directly bonded to the hosel portion without using a sleeve.

1 ... head body 2 ... face surface 21 ... striking point (face center)
Reference Signs List 22 horizontal line 23 horizontal line 3 hosel portion 31 collar portion 32 cylindrical portion 33 female screw hole 34 circular hole 35 regular octagonal hole 4 crown portion 5 sole portion 6 golf shaft 61 shaft axis 62 Intersection point 620 ... Intersection point 621 ... Intersection point 7 ... Sleeve 701 ... Sleeve 702 ... Sleeve 71 ... Outer peripheral surface 72 ... Inner circumferential hole 73 ... Upper end of fixed part (upper end surface of sleeve 7)
730 ... upper end of fixed portion (upper end surface of sleeve 701)
731 ... upper end of fixed portion (upper end surface of sleeve 702)
740 Stepped surface 8 Spacer 81 Inner circumferential hole 9 Cap 91 Packing 92 Inner circumferential hole 93 Male thread 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 fixed portion

Claims

A head body having a face surface for striking a golf ball;
In a metal hollow golf club having a hosel portion fixed to the head body and having an insertion hole into which a tip end portion of a golf shaft is inserted and fixed.
A golf shaft fixing means capable of fixing only the tip end portion at an arbitrary position in the axial direction in the insertion hole is provided, and the golf shaft exceeding the top end portion of the fixing portion of the tip end portion is not in the insertion hole of the hosel portion. A metal hollow golf club characterized by being a restraint.
In the metal hollow golf club according to claim 1,
The golf shaft fixing means includes a sleeve having the tip end adhered to the inner circumferential 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 overall lengths,
The entire length in the axial direction of the inner peripheral hole of the plurality of sleeves is formed to be the same length from the upper end surface of the plurality of sleeves.
In the metal hollow golf club according to claim 2,
A spacer inserted into the insertion hole of the hosel portion in contact with the upper end surface of the sleeve and having an inner peripheral hole larger in diameter than the tip end and the inner peripheral hole of the sleeve;
The spacer is inserted into the insertion hole of the hosel portion in contact with the upper end surface of the spacer, and has an inner peripheral hole larger in diameter than the inner peripheral hole of the tip and the sleeve, and screwed into the hosel portion And a cap for pressing the spacer to fix the hollow golf club.
In the metal hollow golf club according to claim 2,
The sleeve is inserted into the insertion hole of the hosel portion in contact with the upper end surface of the sleeve, has an inner circumferential hole larger in diameter than the tip and the inner circumferential hole of the sleeve, and is screwed into the hosel portion A metal hollow golf club characterized by comprising a cap for pressing and fixing.
In the metal hollow golf club according to claim 2,
It is inserted into the insertion hole of the hosel portion in contact with the step surface of the sleeve formed lower than the upper end surface of the sleeve, and the inner peripheral hole having a diameter larger than the inner peripheral hole of the tip and the sleeve A metal hollow golf club having a cap for screwing into the hosel portion and pressing a stepped surface of the sleeve to fix the sleeve.
The metal hollow golf club according to any one of claims 1 to 5, wherein
The cross-sectional shape of the outer peripheral surface of the sleeve and the cross-sectional shape of the insertion hole of the hosel portion are both the same polygon, and both are engaged.
A head body having a face surface for striking a golf ball;
A metal hollow golf club fixed to the head body and having a hosel portion for fixing a golf shaft,
A tubular sleeve for securing the golf shaft is disposed and secured in the insertion hole of the hosel;
When the head main body is placed on a horizontal surface such that the golf shaft forms a reference lie angle, an intersection point between the upper end of the fixed portion of the shaft tip and the shaft axis is a striking point of the face surface. The shaft tip is inserted into an inner peripheral hole of the sleeve which is substantially above the horizontal line passing through the center and is located in the sleeve, and is fixed by an adhesive. In addition, the hollow golf club is characterized in that the golf shaft beyond the upper end of the sleeve is unrestrained in the insertion hole of the hosel portion.
In the metal hollow golf club according to claim 7,
The head body has a volume of 400 to 470 cm 3 ,
The metal hollow golf club is characterized in that the distance between the horizontal line passing through the face center which is the striking point and the horizontal line passing through the intersection of the fixed part upper end of the shaft tip and the shaft axis is 0-15 mm. .
In the metal hollow golf club according to claim 7 or 8,
A spacer inserted into the insertion hole of the hosel portion in contact with the upper end surface of the sleeve and having an inner peripheral hole larger in diameter than the tip end and the inner peripheral hole of the sleeve;
The spacer is inserted into the insertion hole of the hosel portion in contact with the upper end surface of the spacer, and has an inner peripheral hole larger in diameter than the inner peripheral hole of the tip and the sleeve, and screwed into the hosel portion And a cap for pressing the spacer to fix the hollow golf club.
The metal hollow golf club according to any one of claims 7 to 9, wherein
The cross-sectional shape of the outer peripheral surface of the sleeve and the cross-sectional shape of the insertion hole of the hosel portion are both the same polygon, and both are engaged.