JP2003265661A - Golf club - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correct a slice and a hook by a slicer and a hooker in a head delay type and a head advance type in the case of an impact. <P>SOLUTION: In the golf club, in which a golf club shaft made of a laminated body of fiber reinforced resin layers and having anisotropy to generate twisting around a shaft simultaneously with bending by allowing the fiber angle of the fiber reinforced resin layers to partially differ in a circumferential direction is mounted on a head, when the rear side reference position of the head is defined as 0°, the circumferential reference position of the shaft is set at a position within a range except for 0°, ±90° and 180° positions, in response to the slicer and the hooker in the respective head advance and delay types in the case of the impact. Then the shaft is mounted on the head. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club, and more particularly, when a golf player hits a ball with a so-called slicer that easily slices or a so-called hooker that easily hooks, the impact is corrected without modifying the swing. In golf clubs, the face of the club head that is sometimes attached to the tip of the shaft is straightened in the direction in which it should almost fly.In order to enhance the effect of straightening the face, the mounting position of the shaft and head To improve.

[0002]

2. Description of the Related Art In playing golf, it goes without saying that it is advantageous to fly the ball straight in order to improve the score and to increase the flight distance. However, I am worried about the bend such as so-called hook or slice.

The cause of bending of the hit ball is that the direction of the trajectory of the head and the direction of the face (normal to the face surface) do not match at the time of impact. When facing right, it becomes a flying ball that bends to the right (a so-called slice in a right-handed player), and conversely, when facing left, it becomes a flying ball that bends to the left (a so-called hook in a right-handed player).

Therefore, in order to fly the ball straight, it is necessary to correct the direction of the face at the time of impact, but in reality, there are habits of each player and it is not easy to make corrections.

The present applicant has previously filed Japanese Patent Application Laid-Open No. 3-227616.
In a pipe or a solid shaft formed by using at least a part of an anisotropic material such as a fiber-reinforced resin, the fiber angle of the anisotropic material is partially and circumferentially in the circumferential direction. At least partly different,
It was clarified that the elastic principal axis of the pipe or shaft can be set at an arbitrary position different from the geometrical principal axis. In this case, if a load that does not pass through a point on the elastic main axis is applied downward, the pipe structure will bend (flexure,
Alternatively, bending occurs and twist occurs. In other words, it was clarified that it is possible to give the property that twisting occurs by simply bending.

Further, the present applicant has filed Japanese Patent Application No. 9-24234.
0, Japanese Patent Application No. 10-109942 and Japanese Patent Application No. 10-263
292 proposes a method for improving the strength and productivity of the shaft of a golf club shaft having the above-described twisting property when bent.

Further, the present applicant has filed Japanese Patent Application No. 9-1469.
In No. 50, the anisotropic shaft is applied to a golf club shaft, and the twist of the shaft during bending (deflection, bending) during swing is used to correct the face direction to a desired direction. Thus, a golf club suitable for a hooker or slicer player is proposed.

Similarly, in Japanese Unexamined Patent Publication No. 10-71220, a golf club having a function of improving flight distance, improving directionality, and preventing hook and slice by utilizing the bending and twisting of a shaft during a swing. is suggesting.

As described above, a shaft having the property of being twisted when it is bent utilizes various flexures of the shaft during a swing (especially at impact), and the flexure causes the shaft to move in a desired direction. By attaching a shaft that twists to the head, it is possible to meet various demands for golf clubs.

[0010]

When a shaft having the property of being bent (bent) and twisted is applied to the shaft of a golf club, what is the relative positional relationship between the shaft and the head? It becomes a problem. In other words, the twist angle and twist direction change depending on what kind of bending is used during the swing, the angle and direction of the face surface of the head attached to the tip of the shaft change, and therefore the relative positional relationship between the shaft and the head changes. It will be an important factor. So far, this positional relationship has been limited to the four directions disclosed in Japanese Patent Application No. 9-146950, Japanese Patent Application Laid-Open No. 10-71220, and Japanese Patent No. 2110373 of the present applicant.

Here, the positional relationship in the four directions (mounting direction of the shaft and the head) will be described. For convenience of description, first, the circumferential reference position of the shaft and the back side reference position of the head are defined.

The reference position in the circumferential direction of the shaft is defined as follows. That is, as shown in FIG. 1 (A), a certain position in the circumferential direction of the shaft 1 having a total length of 860 to 1400 mm is directly above and the rear end side (grip mounting side) 1 of the shaft 1
Fix a at a length of 150 mm, and front end (head mounting) 1
A weight 4 (1.1 kg) is hung at a position 20 mm away from b to bend it just below (bend). Also, the front end 1b
The bar 3 was attached orthogonally at a position of 15 mm, and the bending twist amount was detected by the bar 3. At that time,
As shown in (B), when viewed from the shaft fixed side (rear end side), twisting clockwise (clockwise) is defined as positive, twisting counterclockwise (counterclockwise) is defined as negative, and the twist angle (plus) The circumferential position just above when the maximum value is taken is defined as the circumferential reference position of the shaft.

The backside reference position of the head is defined as follows. That is, as shown in FIG. 2, the head 2 is placed in the address state, and the hosel hole 2a for connecting with the shaft is formed.
Consider the position in the circumferential direction. In FIG. 2, the head face side 2b side (A), the side opposite to the face surface (B), the head toe side (Y), and the head heel side (X) are determined in four 90-degree steps. The position (X) is defined as the back side reference position 0 ° of the head.

In the above-mentioned conventional technique, the bending (bending) occurs.
Regarding the application of the shaft having the twisting property to the golf club, the reference position of the shaft has been limited to be aligned with the above four directions.

In addition, regarding the golf club having the function of correcting hooks or slices, which are troubles of many golfers among the four directions, two of the above four directions, that is, the shaft reference position is the X position of the head. Or it has been limited to adjusting to the Y position.

That is, when the shaft reference position is aligned with the Y position of the head, as shown in FIG. 3 (A), the shaft 1 bends due to the toe-down phenomenon at impact, and as shown in FIG. The hook can be prevented by twisting the surface 2b in the opening direction. When the shaft reference position is aligned with the X position of the head, the bending of the shaft 1 due to the toe-down phenomenon at impact causes the face surface 2b to be twisted in the closing direction as shown in FIG. .

As described above, it is a fact that the correction effect of the face surface can be obtained by specifying the mounting position of the head and the shaft having the property of twisting. However, a test to confirm the effect by actual hits by multiple people revealed that the effect may be relatively small depending on the golfer.

For example, when one slicer golfer holds a club for slice straightening and hits the ball, the face straightening effect is remarkably observed, and the slice disappears. When a slicer golfer hits the ball, the correction effect on the face surface was not observed so much, and the slice was not completely eliminated.

As a result of further detailed investigation, it was found that the effect of slicing or hooking differs depending on the type of golfer. Golfers are usually classified into three types. That is, when the bending of the shaft at the time of impact is viewed from the front of the player, as shown in FIG.
As shown in FIG. 4 (B), the golf player whose shaft 1 has a substantially straight impact, as shown in FIG. 4 (C),
There are three types of golfers who have an impact with the head 2 delayed.

As a result of the investigation by dividing into the above three types, FIG.
With respect to the golfer whose shaft 1 is almost straightened due to the impact of (B), a remarkable effect of correcting the face surface was observed. On the other hand, the head 2 of FIG.
Figure 4
As for the golfer whose head 2 (C) is late and has an impact, the result is that the effect of correcting the face surface is small.

The present invention has been made in view of the above problems, and provides a golf club for a slicer and a hooker having a face surface correcting effect even for a golfer whose head impacts in a preceding state or a golfer whose head impacts with a delay. The task is to do.

[0022]

In order to solve the above problems, in the present invention, the mounting position of the head and the shaft is set according to each player, not in the four directions proposed so far, so that the shaft is set. It is possible to maximize the correction effect of the face surface due to.
That is, the actual bending of the shaft at impact is not strictly limited to only the toe-down direction or only the head advancing direction, but can be expressed as a combination of two-direction bending. . Therefore, by adjusting the mounting position of the shaft to the actual bending direction, the maximum face surface correcting effect can be obtained.

Therefore, according to the present invention, the golf club shaft is formed of a laminate of fiber reinforced resin layers, and the fiber angles of the fiber reinforced resin layers are partially different in the circumferential direction, and at the same time, a twist about the axis is generated. In the golf club with the head mounted on the head, the circumferential reference position of the shaft and the back reference position of the head are 0 degrees in accordance with the head leading type and the head lagging type at impact and the slicer and the hooker, respectively, 0 degrees, ± 90 degrees,
The shaft is mounted on the head at a position other than the 180 degree position.

That is, according to the present invention, firstly, in the shaft having the above-mentioned anisotropy, the reference position in the circumferential direction is fitted to a position within the range of +10 degrees to +70 degrees from the back side reference position of the head. , A golf club having a structure in which a slice of a slicer of a head preceding type is corrected. Particularly, the range of +10 to +50 degrees is preferable.

That is, in FIG. 2, the shaft reference position is mounted so as to be aligned with a position within the range of +10 degrees to +70 degrees from the X position of the head to the A position side. When the relative positional relationship between the shaft and the head is set in this manner, the slice straightening effect becomes remarkable for a golfer who tends to slice the head while the head precedes it. In particular, it is more effective to set the shaft reference position closer to A for a golfer whose head is ahead more.

Secondly, according to the present invention, in the shaft having the above-mentioned anisotropy, the reference position in the circumferential direction is mounted so as to match the position within the range of -10 degrees to -70 degrees from the back side reference position of the head. , A golf club having a structure in which a slice of a slicer of a head delay type is corrected. Particularly, the range of -10 to -50 degrees is preferable.

That is, in FIG. 2, the shaft reference position is mounted at a position within the range of -10 degrees to -70 degrees from the X position of the head to the B position side. When the relative positional relationship between the shaft and the head is set in this way, the slice straightening effect becomes remarkable for a golfer who tends to slice the head while lagging behind.
In particular, golfers with larger head delays,
It is more effective to set the shaft reference position closer to B.

Thirdly, according to the present invention, in the shaft having the above-mentioned anisotropy, the reference position in the circumferential direction is fitted to a position within the range of -110 degrees to -170 degrees from the back side reference position of the head. , A golf club having a structure for correcting hooks of a head leading type hooker. Particularly, the range of -130 to -170 degrees is preferable.

That is, in FIG. 2, the shaft reference position is within the range between the B position and the Y position of the head, and is -11 from the X position.
It is attached according to the position within the range of 0 to -170 degrees. When the relative positional relationship between the shaft and the head is set in this manner, the hook straightening effect becomes remarkable for a golfer who has a tendency of the head to impact first and hook. In particular, it is more effective to set the shaft reference position closer to B for a golfer whose head is ahead more.

Fourthly, according to the present invention, in the shaft having the above-mentioned anisotropy, the reference position in the circumferential direction is fitted to a position within a range of +110 degrees to +170 degrees from the back side reference position of the head, and the head is mounted. (EN) Provided is a golf club configured to correct a hook of a delay type hooker. Particularly, the range of +130 to +170 degrees is preferable.

That is, in FIG. 2, the shaft reference position is mounted so as to match the position between the A position and the Y position of the head from the X position to the A position side within the range of +110 degrees to +170 degrees. When the relative positional relationship between the shaft and the head is set in this manner, the hook straightening effect becomes remarkable for a golfer who tends to impact the head with a delay and hook. Particularly, it is more effective to set the shaft reference position closer to A for a golfer whose head has a larger degree of delay.

Fifth, according to the present invention, the shaft having the same structure having the above-mentioned anisotropy is mounted on the head by changing the mounting position in the circumferential direction, and the reference position in the circumferential direction of the shaft is the head. When the position that matches the reference position on the back surface side is 0 degree, it is a position within an angular range excluding 0 degree, ± 90 degrees, and 180 degree positions, and a head leading type slicer and hooker and a head delay type at impact. The golf club in which the shaft is mounted on the head by dividing the reference position in the circumferential direction of the shaft from the reference position on the back side of the head by dividing into four patterns of slicer and hooker. It should be noted that various factors complicate the cause of the change in the shaft bending due to the impact depending on the player, and cannot be generally explained. For example, differences in golfer swing (direction and angle of wrist cocking, tilt of swing plane, timing of wrist cock release, swing time, head speed, etc.) and matching of golfer and shaft flex are related. Conceivable. In addition, it is considered that the head used will also be affected.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. In the examples shown in Table 1 below of the embodiment of the present invention and the conventional example created for comparison with the examples, the shaft, head, and grip used are all common, and the circumference of the mounting position of the shaft and the head is the same. Only the relative positional relationship of directions is changed.

As shown in FIG. 7B, the shaft 1 is
A prepreg sheet 1a in which fibers are impregnated with a resin is wound into a tubular shape, and the prepreg sheet is composed of a laminated body of fiber-reinforced resin layers laminated in a required number. It is configured to cause bending (bending) and twist about the axis at the same time. As shown in FIG. 7 (A), the front end of the fiber-reinforced resin shaft 1 having this characteristic is attached to the head 2 as shown in FIG.
The shaft 1 and the head 2 are integrally connected to each other by inserting and fixing the hosel hole 2a (wood, iron) into the hosel hole 2a. Club length 45 inches, balance D1, loft 10 °
Are common. The balance is a 14-inch type balance, and the loft is a so-called real loft, which is the inclination of the face surface with respect to the shaft axis.

[0035]

[Table 1]

As shown in Table 1, the mounting position of the shaft and head is changed in the circumferential direction. That is, the shaft is mounted in such a manner that the reference position in the circumferential direction of the shaft defined above is aligned with the position on the plus side or the minus side from the back side reference position (X position in FIG. 2) of the head. In the relative position between the head and the shaft in Table 1, when the shaft reference position is aligned with the reference position on the back side of the head (X position in FIG. 2), the relative position is 0 °, and clockwise (clockwise) from there.
The relative position is + θ ° when the shaft reference position is aligned with the position shifted by θ °. For example, A in FIG.
The position is + 90 °. Further, it is assumed that the relative position is −θ ° when the shaft reference position is aligned with the position that is offset by θ ° counterclockwise from the reference position on the back side of the head. For example, the position of B in FIG. 2 is −90 °.

FIG. 5 shows at which position of the head (hosel hole) the shaft reference positions of Examples 1 to 16 and Conventional Examples 1 to 4 shown in Table 1 are aligned.

FIG. 6A is a positional relationship between the head-preceding type slice correcting shaft and the head, FIG. 6B is a positional relationship between the head-lagging type slice correcting shaft and the head, and FIG. 6C is a head-preceding type. (D) shows a positional relationship between the hook straightening shaft and the head, and (D) shows a positional relationship between the head delay type hook straightening shaft and the head.

All golf clubs of Examples 1 to 16 and Comparative Examples 1 to 4 in Table 1 were evaluated by a total of eight golfers (A to H).
We asked which club had the maximum face-correction effect, and investigated which club would be most effective.

In the above investigation, the correction effect of the face surface was confirmed by actually measuring the direction of the face immediately before the impact (30 mm before the ball center). The orientation of the face at the time of impact was measured by capturing an image of the face immediately before the impact (30 mm before the ball center) using a face angle measurement system of Golf Science & Technology Measurement Center, Sumitomo Rubber Industries, Ltd. The results are shown in Table 2. The numerical values in Table 2 are average values of 6 hits each.

[0041]

[Table 2]Golfer Slice straightening maximum club Hook straightening maximum club Impact condition   A Example 1 (+10 degrees) Example 16 (-170 degrees) Head advance   B Example 2 (+30 degrees) Example 15 (-150 degrees) Head advance   C Example 4 (+70 degrees) Example 13 (-110 degrees) Head advance   D Example 9 (-10 degrees) Example 8 (+170 degrees) Head delay   E Example 12 (-70 degrees) Example 5 (+110 degrees) Head delay   F Example 11 (-50 degrees) Example 6 (+130 degrees) Head delay   G Example 11 (-50 degrees) Example 7 (+150 degrees) Head delayH Conventional example 1 (0 degree) Example 4 (± 180 degrees) Straight

The impact states in Table 2 were confirmed from the image of the high-speed camera from the front of the golfer. The "head delay" and "head leading" are the shafts that can be clearly seen from the image. The term “straight” means that the shaft is linear to the extent that it cannot be clearly seen from the image that the head is behind or ahead of the head.

Further, the "maximum slice straightening club" shown in Table 2 is the most face-closed face at the time of impact, out of the 20 hit clubs (conventional examples 1 to 4 and examples 1 to 16). (Right-handed golfer, facing more left). The “maximum hook-correcting club” is a club that has the most open face at the time of impact (a right-handed golfer, which faces more to the right) of the 20 hit clubs.

As can be seen from the results shown in Table 2, the club having the highest correction effect differs depending on each golfer. This is because of the swing pattern, habit, etc. of each golfer.
It is thought that this is because the bending of the shaft at impact is different.

In a golfer in which the head is ahead of the impact, the shaft reference position is from +10 degrees of the head to +
The maximum slice correction effect is up to 70 degrees, -1
The effect of straightening the hook was greatest between 10 degrees and -170 degrees. This indicates that the bending direction of the shaft at the time of impact of each golf player is, for example, +10 degrees in the case of golf player A.

Further, from the results shown in Table 2, it has been found that, among golfers, it is rare for the conventional example to obtain the maximum hook and slice correction effect. This proves that the impact makes the shaft almost straight and there are few golfers who bend only in the toe-down direction.

As is clear from the definition of the shaft reference position, the shaft reference position is directly above and the rear end of the shaft is fixed, a weight is hung from the front end (head mounting side), a load is applied, and the shaft is bent directly below. Sometimes the amount of twist becomes maximum. Therefore, in order to obtain the maximum amount of face correction, it is necessary to set the shaft according to the bending direction of each golfer at the time of impact. However, in the golf clubs of Conventional Examples 1 to 4, the shaft reference position is limited to four directions of 0 °, + 90 °, −90 °, and 180 ° with respect to the head back side reference position, so that for most golfers The maximum amount of face correction was not obtained.

On the other hand, in the golf clubs of Examples 1 to 16 of the present invention, it was proved that the face surface can be corrected most efficiently by setting the shaft according to the characteristics of each golfer. Further, it has been proved that most golfers cannot use the conventional golf clubs 1 to 4 and require a shaft setting different from the conventional one.

[0049]

As is apparent from the above description, the golf club of the present invention comprises a laminate of fiber reinforced resin layers, and the fiber angles of the fiber reinforced resin layers are partially different in the circumferential direction, Using a golf club shaft that bends (bends or bends) and twists about its axis at the same time, the relative positional relationship between this shaft and the head is determined by the head leading type and the head lag type at impact and the slicer. When the reference position in the circumferential direction of the shaft is set to 0 ° as the reference position on the back side of the head, the shaft is set at a position within a range excluding 0 °, ± 90 °, and 180 °. Since the head is attached to the head, the slice straightening effect and the hook straightening effect can be enhanced.

Specifically, the shaft is mounted so that the reference position in the circumferential direction of the shaft is within a range of +10 degrees to +70 degrees from the back side reference position of the head, so that the slice of the head preceding type slicer is corrected. can do. Further, since the reference position in the circumferential direction of the shaft is mounted so as to match the position within the range of -10 degrees to -70 degrees from the back side reference position of the head, it is possible to correct the slice of the head delay type slicer. it can. Further, since the reference position in the circumferential direction of the shaft is mounted in accordance with the position within the range of -110 degrees to -170 degrees from the back side reference position of the head, the hook of the head preceding type hooker can be corrected. it can. Further, since the reference position in the circumferential direction of the shaft is mounted so as to match the position within the range of +110 degrees to +170 degrees from the back side reference position of the head, the hook of the head delay type hooker can be corrected.

[Brief description of drawings]

FIG. 1A is a perspective view showing an experimental apparatus for bending and twisting for defining a reference position of a shaft, and FIG. 1B is a schematic plan view showing each degree of twisting.

FIG. 2 is a schematic view showing a backside reference position of the head and showing the head in an address state.

3A is a schematic view showing a toe-down state when a golfer impacts, FIG. 3B is a view showing an opening direction of a face surface, and FIG. 3C is a view showing a closing direction of the face surface.

4A is a schematic diagram showing a head delay type at impact, FIG. 4B is a schematic diagram showing a straight type at impact, and FIG. 4C is a schematic diagram showing a head leading type at impact.

FIG. 5 is an explanatory diagram showing a mounting position of a shaft with respect to a head of an example and a conventional example.

6A to 6D are explanatory views showing the mounting position of the shaft with respect to the head according to each type.

FIG. 7A is a schematic view of a golf club, and FIG. 7B shows a part of the shaft of the golf club, in which the fiber angles are different in the circumferential direction.

[Explanation of symbols]

1 shaft 2 heads 2a Hosel hole 2b face surface X head backside reference position

Claims (5)

[Claims] 1. A golf club comprising a laminate of fiber reinforced resin layers, and having anisotropy in which the fiber angles of the fiber reinforced resin layers are partially different in the circumferential direction, and at the same time, twisting about an axis is generated. In a golf club in which a shaft is mounted on a head, if the position where the circumferential reference position of the shaft having the above-mentioned anisotropy matches the back face reference position of the head is 0 degree, the circumferential reference position of the shaft is the back side of the head. From the reference position +
Attach according to the position within the range of 10 degrees to +70 degrees,
A golf club configured to correct the slice of a head-preceding slicer. 2. A golf club comprising a laminate of fiber reinforced resin layers, and having anisotropy in which the fiber angles of the fiber reinforced resin layers are partially different in the circumferential direction, and at the same time, twisting about an axis occurs. In a golf club in which a shaft is mounted on a head, if the position where the circumferential reference position of the shaft having the above-mentioned anisotropy matches the back face reference position of the head is 0 degree, the circumferential reference position of the shaft is the back side of the head. From the reference position −
Attach according to the position within the range of 10 degrees to -70 degrees,
A golf club configured to correct the slice of a slicer of the head-lag type. 3. A golf club comprising a laminate of fiber reinforced resin layers, and having anisotropy in which the fiber angles of the fiber reinforced resin layers are partially different in the circumferential direction, and at the same time, twisting about an axis occurs. In a golf club in which a shaft is mounted on a head, if the position where the circumferential reference position of the shaft having the above-mentioned anisotropy matches the back face reference position of the head is 0 degree, the circumferential reference position of the shaft is the back side of the head. From the reference position −
A golf club configured to be mounted according to a position within a range of 110 degrees to −170 degrees to correct hooks of a head preceding type hooker. 4. A golf club comprising a laminate of fiber reinforced resin layers, and having anisotropy in which the fiber angles of the fiber reinforced resin layers are partially different in the circumferential direction, and at the same time, twisting about an axis occurs. In a golf club in which a shaft is mounted on a head, if the position where the circumferential reference position of the shaft having the above-mentioned anisotropy matches the back face reference position of the head is 0 degree, the circumferential reference position of the shaft is the back side of the head. From the reference position +
A golf club configured to be fitted according to a position within a range of 110 degrees to +170 degrees to correct a hook of a head delay type hooker. 5. A golf club comprising a laminated body of fiber reinforced resin layers, and having anisotropy in which the fiber angles of the fiber reinforced resin layers are partially different in the circumferential direction, and at the same time, twisting about an axis is generated. In a golf club in which a shaft is mounted on a head, the shaft having the same structure having the above-mentioned anisotropy is mounted by changing the mounting position in the circumferential direction with respect to the head, and the circumferential reference position of the shaft is a reference on the back surface side of the head. If the position that matches the position is 0 degrees, 0 degrees, ± 90 degrees, 1
The head leading type slicer and hooker and the head lagging type slicer and hooker at the position within the angle range excluding the 80 degree position and at the time of impact
A golf club in which the shaft is mounted on the head by dividing the reference position in the circumferential direction of the shaft from the reference position on the back side of the head by classifying the patterns.