JP2873561B2 - Golf club - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a golf club.

[0002]

2. Description of the Related Art In a golf club having a metal head made of aluminum, stainless steel, titanium or the like,
Conventionally, the tip of a shaft is directly inserted into a hosel provided on a head and fixed with an adhesive.

[0003] Therefore, according to this prior art, the impact generated at the time of the ball impact is transmitted to the player with almost the same size without being reduced, so that the player may hurt his wrist, elbow or shoulder. Further, since the tip of the shaft inserted into the head is restrained by the head and hardly bends, the original performance of the shaft is hardly brought out. In golf play, to increase the flight distance of the ball, the initial velocity of the ball, the launch angle of the ball, the appropriate amount of ball spin, etc. are important factors, and at the time of swinging, the tip of the shaft that transmits energy is flexible. It is effective to increase the club head speed by generating movement and increasing repulsion,
Such an effect cannot be expected with respect to the above conventional technology.

[0004]

SUMMARY OF THE INVENTION In view of the above, the present invention provides a golf club which can reduce the impact generated at the time of ball impact, and which makes it difficult for a player to hurt his wrist, elbow or shoulder. The purpose is to: It is another object of the present invention to provide a golf club in which the distal end of a shaft inserted into a hosel provided in a hollow head can be bent, whereby the inherent performance of the shaft can be easily brought out. It is another object of the present invention to provide a golf club capable of generating a flexible movement at a tip portion of a shaft and increasing a repulsive force to increase a head speed of a club, thereby extending a flight distance of a ball. I do.

[0005]

According to a first aspect of the present invention, there is provided a golf club having a hollow head provided with a hosel, and a hosel provided on the hosel so as not to project into the hollow portion of the head. A non-metallic shaft cylinder in which a cylindrical portion is inserted and fixed and the length of the cylindrical portion is set substantially equal to the length of the hosel, and a tip end of the shaft cylinder which is also not protruded into the hollow portion of the head. And a shaft having a portion interposed and fixed therein, and when swinging, the head returns momentarily due to the impact of an impact, and at the same time, a large repulsive force is generated at the tip of the shaft, and an accelerating force is generated by the repulsive force. A kickback phenomenon that increases the head speed will occur.

According to a second aspect of the present invention, there is provided a golf club having a hollow head provided with a hosel, and a shaft barrel made of a non-metallic material inserted and fixed to the hosel so as not to project into the hollow portion of the head. A shaft having a tip end inserted and fixed to the barrel so as not to project into the hollow part of the head, and a tip end face being substantially flush with the lower end face of the barrel, At the same time as the head returns momentarily due to the impact impact, a large repulsive force is generated at the tip of the shaft, and the repulsive force generates an acceleration force to cause a kickback phenomenon in which the head speed is increased.

[0007]

In the golf club according to the first aspect of the present invention having the above-described structure, a hollow head provided with a hosel, and a tubular portion is fixedly inserted into the hosel so as not to project into the hollow portion of the head. A shaft cylinder made of a non-metallic material having a length of the shape portion substantially equal to the length of the hosel, and a shaft having a tip portion inserted and fixed to the shaft tube so as not to protrude into the hollow portion of the head are also provided. For this reason, the shaft and the head are connected to each other via the shaft tube made of a nonmetallic material, and a structure in which the shaft and the head are not directly connected is realized. Therefore, due to the elasticity of the non-metallic shaft cylinder, the ball impeller
In addition to reducing the impact generated at the time of the impact , the head returns instantaneously due to the impact of the impact when swinging, and at the same time a large repulsive force is generated at the tip of the shaft. Kickback phenomenon can be caused. In addition, since the shaft end made of a non-metallic material and the tip end of the shaft are formed to be short so as not to protrude into the hollow portion of the head, a cylindrical shape for fixing the tip end of the shaft in the hollow portion of the head. There is no need to provide a support.

In the golf club according to the second aspect of the present invention having the above structure, a hollow head provided with a hosel and a non-metallic material inserted and fixed to the hosel so as not to project into the hollow portion of the head. And a shaft whose tip is inserted into and fixed to the barrel so that it does not protrude into the hollow part of the head, and whose tip is aligned substantially flush with the lower end of the barrel. As in the golf club according to claim 1, the shaft and the head are connected to each other via a shaft tube made of a nonmetallic material,
A structure is realized in which the shaft and the head are not directly connected. Therefore, a non-metallic barrel is provided.
Occurs at the time of ball impact due to the elasticity
A kick that can reduce the impact, and at the same time swinging, the head returns momentarily due to the impact impact, and at the same time a large repulsive force is generated at the tip of the shaft, and this repulsive force generates an acceleration force and increases the head speed A back phenomenon can be generated. In addition, since the shaft end made of a non-metallic material and the tip end of the shaft are formed to be short so as not to protrude into the hollow portion of the head, a cylindrical shape for fixing the tip end of the shaft in the hollow portion of the head. There is no need to provide a support.

[0009]

DETAILED DESCRIPTION OF THE INVENTION The non-metallic material of the barrel includes a fiber-reinforced plastic (FRP) or wood having a suitable softness as compared with metal, and a further specific example is glass. Fiber included.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a golf club according to the embodiment has a metal hollow head 1 integrally formed with a substantially cylindrical hosel 2 having a predetermined length L; A shaft cylinder (also referred to as a socket) 3 made of a non-metallic material made of fiber reinforced plastic (FRP) or wood and fixed to the hosel 2 so as not to protrude into the hollow portion 1a, and to the hollow portion 1a of the head 1 as well. A shaft 4 having a tip 4a inserted and fixed to the shaft cylinder 3 so as not to protrude;
At the time of a swing, the head 1 returns momentarily due to the impact of an impact, and at the same time, a large repulsive force is generated at the tip 4 a of the shaft 4. The repelled force generates an acceleration force to increase the head speed. It has a configuration in which a back phenomenon occurs.

The hollow portion 1a of the head 1 is filled with a lightweight filler 5 such as a foam material. A shaft cylinder 3 formed of a non-metallic material such as fiber reinforced plastic (FRP) or wood has a cylindrical cylindrical portion 3a which is inserted into the inner peripheral portion of the hosel 2 and cannot be seen from the outside after insertion. Are formed integrally with the upper end of the cylindrical portion 3a,
It has a larger diameter than the cylindrical portion 3a, has a tapered outer peripheral surface 3c tapered upward, and is provided integrally with an upper end large diameter portion 3b which can be seen from the outside after insertion.
The length of the former cylindrical portion 3 a is set substantially equal to the length L of the hosel 2. Further, a downward annular step 3d is provided at the boundary between the cylindrical portion 3a and the upper end large diameter portion 3b, and when the step 3d is engaged with the upper end surface 2a of the hosel 2 when the hosel 2 is inserted, the hosel 2 is closed. The fixing position (insertion depth) of the shaft cylinder 3 with respect to is specified. The tip end surface 4b of the shaft 4 is substantially flush with the lower end surface 3e of the cylindrical portion 3a of the shaft cylinder 3.

The barrel 3 is adhered to the hosel 2 with an adhesive. As shown in FIG. 2, a female screw 6 is provided on the inner peripheral portion (inner peripheral surface) of the hosel 2 and An external thread 7 is provided on the outer peripheral portion (outer peripheral surface) of the shape portion 3a, and the both members 6, 7 are screwed together, so that the adhesive strength of the shaft cylinder 3 to the hosel 2 is increased.

The tip 4 of the shaft 4 with respect to the barrel 3
In order to specify the fixed position (insertion depth) of a, as shown in FIG. 3, FIG. 4 or FIG.
It is preferable to provide protrusions or flange-like stopper portions 8 and 9 on the inner peripheral portion at the lower end of the cylindrical portion 3a of the shaft cylinder 3, or both.

In the golf club according to the embodiment having the above-described structure, a substantially cylindrical hosel 2 integrally formed with a hollow head 1 and a tip 4a of a shaft 4 inserted and fixed to the hosel 2 are provided. Between the metal and fiber reinforced plastic with appropriate softness compared to metal (FR
P) or the non-metallic shaft cylinder 3 made of wood or the like is interposed, so that the elasticity of the shaft cylinder 3 can reduce the shock generated at the time of ball impact, and Since the magnitude of the shock transmitted to the player is smaller than before, the player is less likely to hurt his wrist, elbow or shoulder.

For the same reason, the distal end 4a of the shaft 4 inserted into the substantially cylindrical hosel 2 integrally formed with the hollow head 1 can be bent, whereby the original performance of the shaft 4 can be easily brought out. Therefore, the flight distance of the ball can be made longer than before.

At the time of a swing, the head 1 returns momentarily due to the impact of the impact, and at the same time, a large repulsive force is generated at the tip 4a of the shaft 4, and the repulsive force generates an acceleration force to increase the head speed. Since the kickback phenomenon occurs, the flight distance of the ball can be made longer than before. Also, if the tip portion 4a of the shaft 4 bends well, the effect of the vertical gear effect of the head 1 is increased, which makes it difficult for the back spin to be applied to the ball. Can be extended.

Further, as described above, the head tube 1 and the tip 4a of the shaft 4 made of a non-metallic material made of fiber reinforced plastic (FRP) or wood are used for the head 1 respectively.
Therefore, it is not necessary to provide a cylindrical support for fixing the distal end 4a of the shaft 4 in the hollow 1a of the head 1 because of being formed short so as not to protrude into the hollow 1a. Therefore, since the weight of the support portion can be shifted to the sole 10 side, the position of the center of gravity of the head 1 can be lowered accordingly.

In addition to this, a female screw 6 is provided on an inner peripheral portion of the hosel 2 and a male screw 7 screwed with the female screw 6 is provided on an outer peripheral portion of the cylindrical portion 3a of the shaft cylinder 3, so that the hosel 2 Since the fixing strength of the barrel 3 is improved, it is possible to effectively prevent the barrel 3 from coming off the hosel 2, thereby improving safety.

[0020]

The present invention has the following effects.

That is, first, in the golf club according to the first aspect of the present invention having the above structure, a hollow head provided with a hosel and a tubular portion inserted into the hosel so as not to project into the hollow portion of the head. A non-metallic shaft cylinder that is fixed and the length of the tubular portion is set to be approximately equal to the hosel length, and a shaft whose tip is inserted and fixed to the shaft cylinder so that it does not protrude into the hollow part of the head Since the shaft and the head are provided, the shaft and the head are connected to each other via the shaft barrel made of a nonmetallic material, and a structure in which the shaft and the head are not directly connected is realized. Therefore, the elasticity of the non-metallic barrel
Therefore, it is possible to reduce the impact generated at the time of ball impact, and at the same time, at the time of swinging, the head returns momentarily due to the impact impact, and at the same time a large repulsive force is generated at the tip of the shaft, which accelerates due to this repulsive force A kickback phenomenon in which a force is generated to increase the head speed can be generated. Therefore, since the magnitude of the impact transmitted to the player is smaller than before,
The player is less likely to hurt his wrist, elbow, shoulder, and the like, and the hitting force is increased by the kickback phenomenon, so that the flight distance of the ball can be extended.

Further, since the shaft end of the non-metallic material and the tip of the shaft are formed short so as not to protrude into the hollow part of the head, the tip part of the shaft is fixed in the hollow part of the head. There is no need to provide a cylindrical support portion for this. Therefore, since the weight of the supporting portion can be shifted to the sole side, the position of the center of gravity of the head can be lowered accordingly.

In the golf club according to the second aspect of the present invention having the above structure, a hollow head provided with a hosel and a non-metallic material inserted and fixed to the hosel so as not to project into the hollow portion of the head. And a shaft whose tip is inserted into and fixed to the barrel so that it does not protrude into the hollow part of the head, and whose tip is aligned substantially flush with the lower end of the barrel. As in the golf club according to claim 1, the shaft and the head are connected to each other via a shaft tube made of a nonmetallic material,
A structure is realized in which the shaft and the head are not directly connected. Therefore, a non-metallic barrel is provided.
Occurs at the time of ball impact due to the elasticity
A kick that can reduce the impact, and at the same time swinging, the head returns momentarily due to the impact impact, and at the same time a large repulsive force is generated at the tip of the shaft, and this repulsive force generates an acceleration force and increases the head speed A back phenomenon can be generated. Therefore, since the magnitude of the impact transmitted to the player is smaller than before, the player is less likely to hurt his wrist, elbow or shoulder, and the kickback phenomenon increases the hitting force. Can be extended.

Further, since the shaft end made of a non-metallic material and the end of the shaft are formed short so as not to protrude into the hollow part of the head, the end part of the shaft is fixed in the hollow part of the head. There is no need to provide a cylindrical support portion for this. Therefore, since the weight of the supporting portion can be shifted to the sole side, the position of the center of gravity of the head can be lowered accordingly.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a golf club according to an embodiment of the present invention.

FIG. 2 is an exploded sectional view of a main part of the golf club.

FIG. 3 is a sectional view of a main part of a golf club according to another embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a golf club according to another embodiment of the present invention.

FIG. 5 is a sectional view of a main part of a golf club according to another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 head 1a hollow portion 2 hosel 2a upper end surface 3 shaft cylinder 3a cylindrical portion 3b upper end large diameter portion 3c outer peripheral surface 3d step portion 3e lower end surface 4 shaft 4a distal end portion 4b distal end surface 5 filler 6 female screw 7 male screw 8,9 stopper Part 10 Sole

Claims (2)

(57) [Claims] 1. A hollow head (1) provided with a hosel (2), and a tubular portion (3a) inside the hosel (2) so as not to project into a hollow portion (1a) of the head (1). A shaft cylinder (3) made of a non-metallic material, which is inserted and fixed and the length of the cylindrical portion (3a) is set substantially equal to the length of the hosel (2), and a hollow portion (1a) of the head (1). )
A shaft (4) having a tip (4a) inserted and fixed to the shaft cylinder (3) so as not to protrude from the shaft cylinder (3). A golf club characterized in that a large repulsive force is generated at the tip (4a) of the shaft (4), and the repulsive force generates an acceleration force to cause a kickback phenomenon in which the head speed is increased. 2. A hollow head (1) provided with a hosel (2), and a non-metallic material inserted and fixed to the hosel (2) so as not to protrude into the hollow portion (1a) of the head (1). A tip (4a) is inserted into and fixed to the barrel (3) so as not to protrude into the hollow part (1a) of the head (1). A shaft (4) that is substantially flush with the lower end surface (3e) of the barrel (3), and when the head (1) returns instantaneously due to the impact of an impact when swinging, the shaft (4) A golf club characterized in that a large repulsive force is generated at the front end (4a) of the above (4), and the repulsive force generates an acceleration force to cause a kickback phenomenon in which the head speed is increased.