CN113950360A

CN113950360A - Golf club

Info

Publication number: CN113950360A
Application number: CN201980097279.0A
Authority: CN
Inventors: 三边松彦
Original assignee: Japan Kamuy Manufacturing Co ltd
Current assignee: Japan Kamuy Manufacturing Co ltd
Priority date: 2019-10-08
Filing date: 2019-10-08
Publication date: 2022-01-18
Also published as: KR20220069882A; WO2021070242A1

Abstract

The head has a metal head body 14 having a hollow shape and an opening on the face side, and a face member 12 joined to the opening on the face 12a side of the head body 14 to form a face 12 a. The shaft-like member 20 is provided, and faces the center of the rear surface 12b of the face member 12 in the head body 14 in a state where the face member 12 and the head body 14 are joined integrally. The front end 20d of the shaft-like member 20 is spaced apart from and faces the center of the rear surface 12b of the face member 12 by a predetermined gap W, which is a distance at which the face member 12 bends to impact the rear surface 12b when the golf club head 10 strikes a golf ball. The center axis of the shaft-like member 20 is positioned in the vertical direction with respect to the rear surface 12b of the face member 12. The shaft-like member 20 can adjust its position in the central axis direction. The force in the compression direction acts on the shaft-like member 20 by the impact of the face member 12 when the golf ball is struck.

Description

Golf club

Technical Field

The present invention relates to a golf club including a golf club head called a metal head formed of a metal shell.

Background

In recent years, a so-called metal head is formed by forming a body portion by casting and joining a front face portion by welding to form a head portion. Regarding a wood-type golf club of this type, a golf club head that is lightweight and has a stronger rebound force at the time of hitting a ball is sought. In particular, the spring effect on the face of the golf club head is effective in extending the flight distance of the shot.

As disclosed in patent document 1, a golf club has been proposed in which a spring member is built in a head of the golf club, and the spring member presses a rear surface of a face to give power to a shot. The golf club of patent document 1 is provided with an adjustment member that adjusts the position of the spring member, and the position of the adjustment member is made to coincide with the position of the center of gravity of the golf club head. Therefore, the inner surface of the striking surface of the golf club head is pressed by the spring member, and the gravity center depth of the golf club head can be properly adjusted by the adjusting member of the pressing force.

Further, patent document 2 discloses a golf club in which a shaft-like member extending obliquely from a sole is provided on the rear surface of the striking surface of a golf club head, and the rigidity of the striking surface in a region in contact with the shaft-like member is improved. Further, it is also disclosed that a golf club head can be formed by making the shaft-like member detachable to change its rigidity, thereby adjusting the rebound force of the face and conforming to the use condition.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2016-158915

Patent document 2: international publication No. WO2010/126729

Disclosure of Invention

Problems to be solved by the invention

In the case of the golf club disclosed in the above-mentioned prior art patent document 1, the spring member abuts against the face of the golf club head to improve the rebound performance of the face, but if the thickness of the face is made thin to increase the rebound due to the compression of the spring member to a certain extent, a sufficient rebound force cannot be obtained. This is because the initial velocity of the golf ball at the time of striking is instantaneously rebounded by the spring member, and the spring member is not very hard and has no effect if the spring member has a large elastic coefficient. In addition, in the golf club head having high rebound performance in which the Spring member is constantly in contact with the face, the coefficient of restitution (COR) of the face exceeds a fixed value (0.830), and thus the regulation of SLE (Spring Like Effect) is not satisfied. Therefore, such a golf club head has a problem of being regularly prohibited from being used in official competitions.

Further, in the case of the golf club disclosed in patent document 2, there is a problem similar to the above, and further, since the shaft-like member is not perpendicular to the face but obliquely abuts against the face from the bottom, a torque other than compression acts on the bending of the face on the shaft-like member, and only a part of the force from the face acts in the longitudinal direction of the shaft-like member, and the effect of supporting the face and applying the repulsive force to the ball is small.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a golf club head which effectively increases the bounce transmitted from a striking surface to a ball at the time of striking the ball under a constant condition, increases the ball speed of the ball at the time of striking the ball, extends the flight distance of the ball, and conforms to the rules of golf.

Means for solving the problems

The present invention is a golf club including a golf club head having a metal head body having a hollow shape and an opening on a face side, and a face member joined to the opening on the face side of the head body to form a face, the golf club head including a shaft-like member having a rear surface central portion facing the face member in the head body in a state where the face member and the head body are joined to each other, a front end portion of the shaft-like member facing the rear surface central portion of the face member with a predetermined gap, the gap being a gap at which the face member bends to allow the rear surface to be struck when a golf ball is struck by the golf club head, a center axis of the shaft-like member being positioned in a vertical direction with respect to the rear surface of the face member, the shaft-like member is provided so that its position can be adjusted in the center axis direction, and the golf club head is provided so that a force in a compressive direction acts on the shaft-like member by the impact of the face member when the golf ball strikes the ball.

The shaft-like member is a metal column and is disposed so as to straddle the center of gravity of the golf club head. The gap is set to an interval approximately equal to the thickness of the face member. The shaft-like member has a male screw, and is provided so that the male screw is screwed into a female screw of a recess formed in the bottom of the head body, and the position of the shaft-like member can be adjusted. The male screw is screwed to the female screw of the mounting hole formed in the recess, and the head of the shaft-like member is provided to be exposed in the recess and is provided so that the position of the shaft-like member can be adjusted by the head.

An elastic member that is a spring made of resin, rubber, or metal is provided at a front end portion of the shaft-like member, the front end portion being opposed to the rear surface center portion of the striking surface member, the elastic member being spaced apart from and facing the rear surface center portion by a predetermined gap.

Effects of the invention

In the golf club head interior of the present invention, the inner surface of the face member faces the tip end portion of the shaft-like member with a predetermined gap, and the face member bent by a ball hit impacts the tip end portion of the shaft-like member and compresses the shaft-like member at the time of ball hit by the golf club. Thereby, the repulsive force of the shaft-like member at the time of compression is transmitted to the golf ball through the face member together with the repulsive force by the bending of the face member, and the ball speed at the time of hitting the golf ball is increased. In particular, since the front end portion of the shaft-like member is spaced apart from the rear surface of the face member, the repulsive force due to the relatively soft bending of the face member and the repulsive force due to the compression of the shaft-like member instantaneously act, and the repulsive force is effectively transmitted from the face to the ball. Furthermore, the shaft-like member does not contact the striking face member at any time, so that the golf club head does not violate the golf rules and can be used for official competitions.

Further, the golf club according to the present invention can adjust the center of gravity depth of the golf club head by adjusting the position of the shaft-like member, and can adjust the center of gravity depth to increase the ball speed without increasing the trajectory of the shot. On the contrary, the center of gravity depth can be adjusted to be deep, and the hitting ball is easy to rise, so that the golf club head is more suitable for the junior. Accordingly, the golf club according to the present invention is a golf club conforming to golf rules, and a golf club that can be used for a wide range of golf players can be widely used in various games including official competitions by adjusting the same golf club even if the golf club is changed without depending on the skill improvement of the user.

Drawings

FIG. 1 is a longitudinal perspective view of a golf club head according to a first embodiment of the present invention.

Fig. 2 is a longitudinal sectional view of the golf club head of the present embodiment.

Fig. 3 is a cross-sectional view of the golf club head of the present embodiment.

FIG. 4 is a longitudinal cross-sectional view of a golf club head according to a second embodiment of the present invention.

FIG. 5 is a cross-sectional view of a golf club head according to a second embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a golf club head according to a third embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 to 3 show a golf club head according to a first embodiment of the present invention, and a golf club head 10 according to this embodiment is formed of a face member 12 constituting a face 12a for hitting a ball and a head main body 14 provided on the rear side thereof.

The face 12a is a face, and is formed in an opening of the head body 14 by welding or the like with a face member 12 such as a β -type titanium alloy formed by forging. The thickness of the face member 12 may be appropriately set in the range of 1.8mm to 3.2 mm. For example, when the spring back is set to be high, the range of 1.8mm to 2.0mm is preferable, and conversely, when the rigidity is set to be high to enhance the strength, the range of 3.0mm to 3.2mm may be used. On the rear surface 12b of the face member 12, a plurality of groove-shaped score lines 12c are formed in the horizontal direction when the golf club 10 is prepared at the time of hitting a ball.

The head body 14 is hollow and integrally cast, and is formed of a titanium alloy such as 6-4 titanium (Ti-6Al-4V) or 811 titanium. The thickness of the club head body 14 is, for example, 1.0 to 1.7mm, and may be set to be different depending on the part. The golf club head 10 of this embodiment is, for example, a driver head, and the volume is set to 460cm, which is a range of a predetermined value³. The sole 14a, which is the lower surface of the head body 14, is formed with a recess 16 for attaching and operating a shaft-like member 20 described later.

The recess 16 of the bottom portion 14a is formed in a shape in which the central portion of the bottom portion 14a is cut out in an L-shaped cross section, and in a side surface of the L-shaped cross section, a mounting hole 22 for inserting the shaft-like member 20 is formed in a mounting surface 16a parallel to and facing the striking surface 12 a. Mounting surface 16a and mounting hole 22 of recess 16 are formed at approximately the center of gravity of head body 14. The mounting hole 22 is formed integrally with the head main body 14 in a cylindrical shape so as to be oriented in a vertical direction of the striking surface 12a, and has an internal thread 22a formed on an inner peripheral surface thereof. The internal thread 22a is provided to be threadably engaged with the external thread 20a of the shaft-like member 20.

The shaft-like member 20 is preferably a metal columnar member, and a bolt formed with an external thread 20a may be used. Or alternatively. Alternatively, the male screw 20a may be formed in a fixed length near the head 20b of the shaft-like member 20 of the metal column. An outer end surface of the head 20b is provided with an adjustment groove 20c for position adjustment, which will be described later. The shaft-like member 20 is provided such that the male screw 20a is screwed into the female screw 22a of the mounting hole 22 formed in the recess 16, and the head 20b of the shaft-like member 20 is exposed outside the mounting surface 16a of the recess 16, and the position of the shaft-like member 20 can be adjusted by rotating the shaft-like member 20 from the outside.

The front end 20d of the shaft-like member 20 is disposed to face the center of the back surface 12b of the face member 12, and the front end 20d of the shaft-like member 20 is spaced apart from and opposed to the center of the back surface 12b by a predetermined gap W. The gap W with the rear face 12b is a smaller interval than the amount of bending of the face member 12 toward the head body 14 when a golf ball is struck by the golf club head 10 without the shaft-like member 20. The gap W is set to, for example, approximately an interval of the thickness of the face member 12, 2.0mm to 3.0mm, and approximately ± 30%, preferably approximately ± 20%, of the thickness of the face member 12. For example, the gap W is set to about 2.5mm, and the position of the shaft-like member 20 is adjusted by rotating the shaft-like member with the adjustment groove 20c, whereby the gap W can be adjusted by increasing or decreasing. The adjustment range in which good effects can be obtained is about ± 30%, preferably about ± 20%, of the thickness of the face member 12. If the value of the gap W is smaller than the above value, the bending effect of the face member 12 is small, and a sufficient repulsive force of the face member 12 cannot be obtained, whereas if the value is larger than the above value, the shaft-like member 20 is not impacted even if the face member 12 is bent by a shot, and a repulsive force from the shaft-like member 20 cannot be obtained.

The longitudinal direction of the shaft-like member 20 is arranged in a perpendicular direction with respect to the rear surface 12b of the face member 12, and the rear surface 12b impacts the tip 20d of the shaft-like member 20 during a hitting operation, and the shaft-like member 20 is compressed in the axial direction by the bending of the face member 12. The shaft-like member 20, which is disposed in compression, causes the repulsive force from the elastically compressed state to act perpendicularly to the face member 12 and positively transmits its repulsive force to the ball at the time of hitting the ball.

A shaft mounting tube 30 is integrally formed in the heel portion 14b of the head body 14 by casting. The shaft mounting tube 30 is a bottomed cylindrical portion into which a shaft 32 is inserted and fixed. Further, weight mounting holes 34 for selectively mounting a weight, not shown, for adjusting balance are formed in the left and right sides of the sole portion 14a of the head body 14. The weight mounting hole 34 also has a bottom and is integrally cast.

The method of manufacturing the golf club head 10 is to forge the face member 12 into a plate shape having a predetermined shape by using various β -type titanium alloys or the like, and to adjust the thickness and shape. The head body 14 is cast using 6-4 titanium, 811 titanium, or the like, is formed into a hollow predetermined shape, and is adjusted in shape. Further, the screw cutting of the mounting hole 22 of the recess 16 is performed and the internal thread 22a is formed. Thereafter, the face member 12 is welded to the opening portion on the face side of the head body 14. The entire periphery of the face member 12 is welded to the entire periphery of the opening of the head body 14. Thereafter, the welded portion is ground and the front surface is finished, and necessary processing such as front surface painting is performed.

Next, the shaft-like member 20 is screwed into the mounting hole 22 of the recess 16, and mounted so that the distal end portion 20d of the shaft-like member 20 faces the rear surface 12b of the striking face member 12 with a gap W therebetween. The value of the gap W is first set to, for example, 2.5mm, and is adjusted according to the skill level or preference of the user after the user purchases a golf club.

For example, if the gap W is increased, the amount of bending of the face member 12 increases, and the amount of compression reduction of the shaft-like member 20 after the shaft-like member 20 is impacted decreases. In this case, the depth of the center of gravity of the golf club head 10 becomes large. Such adjustment is suitable for a user having a relatively slow head speed, and the rebound due to the bending of the face member 12 is relatively large, and the rebound due to the compression of the shaft-like member 20 is added to increase the ball speed at the time of hitting a ball, and the ball passes through a deep center depth to have a high trajectory and extend the flight distance.

On the other hand, in the case of a user with a relatively high head speed, the gap W is adjusted to be narrow, so that the amount of bending of the face member 12 at the time of hitting is suppressed, and the amount of compression and reduction of the shaft-like member 20 after the face member 12 impacts the shaft-like member 20 is relatively increased. In this case, the depth of the center of gravity of the golf club head 10 becomes smaller. Thus, even in the case of a user who has a strong driver who has a high head speed, the rebound due to the compression of the shaft-like member 20 is effectively added to the rebound due to the bending of the face member 12, so that the ball speed at the time of hitting the ball is increased, and the excessive rise of the hit ball is suppressed by the shallow center-of-gravity depth to extend the flight distance. Furthermore, the fracture of the striking face member 12 can be prevented.

In the golf club according to this embodiment, since the tip end portion 20d of the shaft-like member 20 faces the inner surface 12b of the face member 12 with a gap W in the golf club head 10, the face member 12 bent by the impact hits the tip end portion 20d of the metal columnar shaft-like member 20 at the time of hitting the ball with the golf club, and the shaft-like member 20 is compressed by the impact energy. The repulsive force of the shaft-like member 20 at the time of compression is instantaneously transmitted to the golf ball via the face member 12, and the ball speed of the golf ball is increased. In particular, since the front end portion 20d of the shaft-like member 20 is separated from the rear surface 20b of the face member 20 by the gap W, the repulsive force due to the relatively soft bending of the face member 12 and the repulsive force due to the compression of the relatively hard shaft-like member 20 instantaneously act with high reactivity and are efficiently transmitted from the face member 12a to the ball. Further, since the shaft-like member 20 does not contact the face member 12 at any time, it can be used for official competitions without violating the golf rules.

Further, since the bending of the face member 12 at the time of hitting the ball is restricted by the impact on the shaft-like member 20 and the impact force from the face member 12 acts so as to compress the shaft-like member 20 in the axial direction, the ball is hit with a repulsive force due to the bending of the face member 12 and the compression of the shaft-like member 20, while preventing the breakage of the face member 12, and the speed of hitting the ball is increased.

In the prior art, in order to enlarge the spring effect derived from the repulsive force of the face member 12, the face member 12 is thinned to enlarge the curvature of the face 12, and therefore the ball flies out away from the face 12a without returning the curvature of the face member 12, and a sufficient repulsive force cannot be obtained. This problem is particularly the case with strong strikers whose head is fast. In the case of a strong impact, if the face member 12 is thinned, the face member 12 is likely to be broken.

In contrast, in the case of this golf club head 10, the bending of the face member 12 at the time of hitting is restricted by the shaft-like member 20, and the rebound due to the bending of the face member 12 is compensated by the compression and rebound of the shaft-like member 20. This improves the response of the face member 12 to bending and to bending recovery, and effectively transmits the repulsive force from the face 12a to the ball, thereby increasing the speed of the ball at the time of hitting the ball. Further, the striking face member 12 can be prevented from being damaged.

In addition, in the golf club head 10, the position of the shaft-like member 20 and the center of gravity depth of the golf club head 10 can be adjusted, and when the center of gravity depth is adjusted to be shallow by narrowing the gap W, the ball speed can be increased without increasing the trajectory of the shot, and the golf club is suitable for a skilled person who has a high head speed as described above. On the other hand, if the center of gravity is set to be deep by enlarging the gap W, the shot tends to rise, and the golf club is more suitable for the first-class person.

The golf club according to this embodiment is a rule-compliant golf club, and can be formed to correspond to a wide range of golf players. Even if a user does not change his or her skill to buy a golf club, the golf club can be used for a long time including official competitions as a golf club in an optimum state by adjusting the same golf club.

Next, a golf club head 40 of a golf club according to a second embodiment of the present invention will be described with reference to fig. 4 and 5. The golf club head 40 of this embodiment has the same configuration as the golf club head 10 of the first embodiment, and an elastic member 42 is provided at the tip of the shaft-like member 20, and the elastic member 42 is made of a resin such as vinyl chloride or silicone resin, or a rubber such as synthetic rubber, natural rubber, or silicone rubber. The elastic member 42 faces the center portion of the back surface 12b of the striking surface member 12 with a predetermined gap W, as in the above-described embodiment. The elastic member 42 is formed in a conical shape whose outer diameter decreases toward the tip, and the tip is rounded.

The shaft-like member 20 provided with the elastic member 42 is provided such that the external thread 20a is screwed with the internal thread 22a of the mounting hole 22 formed in the recess 16, and the head 20b of the adjustment member 20 is exposed on the surface 16a of the recess 16, and the adjustment member 20 can be rotated from the outside to adjust the position.

According to the golf club head 40 of this embodiment, the same operational effects as those of the above-described embodiment can be obtained, and particularly, even for a user having a relatively slow head speed, the ball speed can be increased by instantaneous compression and rebound of the elastic member 42 at the time of hitting a ball.

Next, a golf club head 44 of a golf club according to a third embodiment of the present invention will be described with reference to fig. 6. The golf club head 44 of this embodiment has the same configuration as the golf club head 10 of the first embodiment, and includes a flange-like stopper 24 concentrically provided in the middle of the shaft-like member 20, and a fitting portion 26 formed at the projecting front end thereof, and the fitting portion 26 is fitted with a coil-like spring member 46 as an elastic member. The stopper 24 may be a flange or a step or a projection, and the fitting portion 26 is located outside the spring member 46 and is formed to abut against a predetermined position.

The shaft-like member 20 to which the spring member 46 is fitted is provided with an external thread 20a for screwing with an internal thread 22a of the mounting hole 22 formed in the recess 16, and the head 20b of the adjustment member 20 is exposed outside the surface 16a of the recess 16, and the adjustment member 20 is rotated from the outside to adjust the position.

The front end of the spring member 46 faces the center of the rear surface 12b of the face member 12 with a predetermined gap W. The spring member 46 is a stiff spring with a high spring rate, preferably as short a length as possible and preferably as small a mass as possible.

According to the golf club head 44 of this embodiment, the same effects as those of the above-described embodiment can be obtained, and particularly, even for a user having a relatively slow head speed, the ball speed can be increased by instantaneous compression and rebound of the spring member 46 at the time of hitting the ball.

The golf club according to the present invention is not limited to the above-described embodiments, and the material, shape, or mass of the metal of the shaft-like member may be appropriately set. The shape of the face member and the head body, the thickness and material of each portion, and the type of titanium or titanium alloy may be appropriately selected. For example, the beta type titanium alloy may be Ti-22V-4Al alloy, Ti-13V-11Cr-3Al alloy, Ti-11.5Mo-6Zr-4.5Sn alloy, Ti-15Mo-3Cr-3Sn-3Al alloy, or other titanium alloys. Furthermore, the elastic member is made of a material or a shape. The formation of the head body may be a forging structure formed by forging a plurality of parts and welding, in addition to casting, and the number of components to be constituted may be appropriately set.

Description of the reference numerals

10, 40, 44 golf club head

12 striking face component

12a striking face

12b back side

14 club head body

16 concave part

20 shaft-shaped component

20a external thread

20b head

20c adjustment groove

20d front end

22 mounting hole

22a internal thread

30 shaft mounting tube part

32 shaft

42 elastic member

46 spring component

Claims

1. A golf club comprising a golf club head having a hollow metal head body with an opening on a face side and a face member joined to the opening on the face side of the head body to form a face,

the golf club head includes a shaft-like member that faces a rear center portion of the face member in the head body in a state where the face member is joined to the head body integrally,

a front end portion of the shaft-like member is spaced apart from and opposed to the rear surface central portion of the face member by a predetermined gap that allows the face member to bend and impact the rear surface when a golf ball is struck by the golf club head,

a center axis of the shaft-like member is located in a vertical direction with respect to the rear surface of the face member, the shaft-like member being provided so that a position thereof can be adjusted in the center axis direction,

the golf club head is provided so that a force in a compressive direction acts on the shaft-like member by the impact of the face member at the time of hitting of the golf ball.

2. The golf club according to claim 1,

the shaft-like member is a metal column and is provided so as to straddle the position of the center of gravity of the golf club head.

3. The golf club according to claim 1,

the gap is set to an interval approximately equal to the thickness of the face member.

4. The golf club according to claim 1 or 2,

the shaft-like member has an external thread, and is provided so that the external thread can be screwed into an internal thread of a recess formed in the bottom of the head body to adjust the position.

5. The golf club according to claim 4,

the male screw is screwed to the female screw of the mounting hole formed in the recess, and the head of the shaft-like member is provided to be exposed in the recess and is provided so that the position of the shaft-like member can be adjusted by the head.

6. The golf club according to any one of claims 1 to 5,

a portion of a front end of the shaft-like member, which is opposed to the rear surface central portion of the face member, is provided with an elastic member that faces the rear surface central portion with a predetermined gap therebetween.

7. The golf club of claim 6,

the elastic member is made of resin or rubber.

8. The golf club of claim 6,

the elastic member is a metal spring.