Golf club shaft and golf club

Abstract

To provide a golf club shaft and a golf club which easily generate a flying ball with a locus assumed by a player.SOLUTION: There is provided a golf club shaft 11 in which a line 14 with a prescribed width dimension extending from a grip 12 side to a head 13 side, is drawn on a peripheral surface thereof, the line 14 being curved along the peripheral surface as extending to the head 13 side. Especially, the line 14 is linear on the grip 12 side between the grip 12 and the head 13, and is curved on the head 13 side. The line is formed of a first line 14a curved in a rotation direction of a clock as extending to the head 13 side, and a second line curved in a non-rotation direction of the clock as extending to the head 13 side, and on the head 13 side, the first line 14a and the second line are coupled with each other.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a golf club shaft and a golf club. [Background technology]

[0002] With golf clubs, the positional relationship between the face of the head at the tip of the golf club and the ball is important. If the face is a so-called "hook face" relative to the ball, the ball will curve to the left. On the other hand, if the face is a so-called "open face" relative to the ball, the ball will curve to the right. Note that this is the case for right-handed players, and the opposite is true for left-handed players. Players adjust the direction of the face while taking into account the wind direction on the course and the shape of the course. Naturally, if the face is a so-called "square face," the ball will fly straight.

[0003] However, there is a relatively large distance between the player's eyes and the head, and amateur players often have difficulty correctly identifying the orientation of the face. Therefore, it has been proposed to provide a straight auxiliary line on the surface of the shaft to make it easier to identify the orientation of the face (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 04-276274 [Patent Document 2] Japanese Patent Application Publication No. 11-047326 Summary of the Invention [Problem to be solved by the invention]

[0005] However, many players experience that even if the face orientation is carefully adjusted before the swing, the player's inconsistent motion during the swing will result in the face orientation changing.

[0006] In particular, each player's swing is prone to have its own unique habits, and it is extremely difficult to correct the habit of naturally opening the face or hooking the face during the downswing. Also, when a player is nervous, the player's unique habits are more likely to appear.

[0007] The inventor, while studying ways to mitigate the influence of such player's habits, discovered that a large mitigating effect could be expected by applying a specific design to the shaft, which led to the invention. That is, the present invention provides a golf club shaft and a golf club that make it easier for the player to hit the ball along the trajectory that he or she expects. [Means for solving the problem]

[0008] In the golf club shaft of the present invention, a line of a predetermined width extending from the grip side to the head side is drawn on the circumferential surface, and the line is curved along the circumferential surface as it extends toward the head side.

[0009] The golf club shaft of the present invention is also characterized in the following respects. (1) The line is straight on the grip side between the grip and the head, and curved on the head side. (2) The lines are a first line that curves in the direction of rotation of the clock as it extends toward the head side, and a second line that curves in the direction of counterclockwise rotation of the clock as it extends toward the head side. (3) The first wire and the second wire are joined to each other on the head side.

[0010] The golf club of the present invention is a golf club equipped with the above-mentioned golf club shaft. Effect of the Invention

[0011] According to the present invention, a golf club shaft is provided with a line that curves circumferentially as it extends toward the head, so that when a player swings a golf club equipped with this shaft, the player sees this line just before striking the ball, which suppresses the emergence of bad habits and enables the ball to fly along the expected trajectory. [Brief description of the drawings]

[0012] [Figure 1] 1 is an explanatory diagram of a state in which the golf club according to the present embodiment is used; [Diagram 2] 1 is an explanatory diagram of a state in which the golf club according to the present embodiment is used; [Diagram 3] FIG. 1A is an exploded plan view of a golf club shaft according to the present embodiment, FIG. 1B is an exploded plan view of a golf club shaft according to another embodiment, and FIG. 1C is an exploded plan view of a golf club shaft according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] In the golf club shaft and golf club of the present invention, a line of a predetermined width is drawn on the circumferential surface of the golf club shaft, extending from the grip side to the head side. The width of the line is not particularly limited, and it is sufficient if it can be visually recognized as a line. In the embodiment described below, for convenience of explanation, the line is described as one line, but it may be multiple lines.

[0014] As shown in Fig. 1, the golf club 10 is constructed by attaching a grip 12 to the base end of a thin cylindrical shaft 11 and attaching a head 13 to the tip of the shaft 11. The shaft 11 may be made of carbon fiber, boron fiber, or metal. In the case of a shaft 11 made of carbon fiber or boron fiber, the background color is black, which makes it easy to increase the contrast with the lines drawn on the surface of the shaft 11.

[0015] The shaft 11 has a gradually thinner diameter toward the tip on the head 13 side, and a line 14 of a predetermined width is drawn on the outer circumferential surface, extending from the grip 12 side to the head 13 side.

[0016] As shown in FIG. 1, this line 14 is curved in the circumferential direction as it extends toward the head 13 side.

[0017] In particular, the line 14 is straight at least on the grip 12 side between the grip 12 and the head 13, and curved on the head 13 side. More specifically, the line 14 is curved in a region of about one-third of the length of the line 14 on the head 13 side between the grip 12 and the head 13.

[0018] The line 14, which is linear on the grip 12 side, is gradually narrowed as it extends toward the head 13 side because the shaft 11 itself is narrowed in diameter. This linear portion is located on a plane passing through the center axis of the shaft 11, so that a player who sees this linear line 14 recognizes that it indicates the center of the shaft 11. This linear line 14 may be partially missing in order to provide a trade name or the like for the shaft 11. It is desirable to position the missing area of ​​the line 14 as close to the grip 12 side as possible.

[0019] The curved line 14 on the head 13 side of the shaft 11 has a gradually increasing curvature as it approaches the head 13. In other words, the line 14 is bent more greatly as it approaches the head 13.

[0020] Also, as shown in Fig. 1, the curved line 14 curves in the clockwise direction as it extends toward the head 13. Alternatively, as shown in Fig. 2, the curved line 14 may curve in the counterclockwise direction as it extends toward the head 13. The line that curves in the clockwise direction as it extends toward the head 13 is called the first line 14a, and the line that curves in the counterclockwise direction as it extends toward the head 13 is called the second line 14b.

[0021] The first line 14a and the second line 14b may be drawn on the surface of the shaft 11, or both may be drawn, as shown in the development explanatory diagram of the shaft 11 in FIG. 3(a). In particular, as shown in FIG. 3(a), the first line 14a and the second line 14b are positioned apart from each other on the grip 12 side, approach each other as they approach the head 13 side, and are joined to each other on the head 13 side. Incidentally, the golf club 10 in FIG. 1 shows a state in which the first line 14a is visible on the shaft 11 shown in FIG. 3(a), and the golf club 10 in FIG. 2 shows a state in which the second line 14b is visible on the shaft 11 shown in FIG. 3(a). The development explanatory diagram of the shaft 11 is a state diagram in which the shaft 11 is cut along the extension direction and expanded.

[0022] When the first line 14a and the second line 14b are joined to each other on the head 13 side, the joined portion can be made into a sharp-pointed pattern. The tip of the sharp-pointed pattern can be used as an alignment mark when attaching the head 13, and as described later, it is possible to improve the accuracy of alignment when attaching the head 13 to the shaft 11.

[0023] In this way, the golf club 10 formed with the golf shaft 11 on which the curved line 14 is drawn has the effect of alleviating the habits of the player using the golf club 10, although the causal relationship is unclear.

[0024] That is, in the case of a player who has an open face during the downswing, the player is assumed to be right-handed, and there was a tendency for the degree of open face to be improved by mounting head 13 so that second line 14b, which curves counterclockwise as it extends toward head 13, is within the player's eyes during the swing.

[0025] On the other hand, in the case of a player who develops a hook face during the downswing, the player is again assumed to be right-handed, and a tendency was observed in which the degree of the hook face was improved by mounting the head 13 so that the first line 14a, which curves clockwise as it extends toward the head 13, comes into the player's eye during the swing.

[0026] Although these do not directly affect the player who is swinging, we believe that the curved shape of the surface of shaft 11 that catches the player's eye during the swing acts on the player unconsciously, influencing the rotational movement of the player's trunk or the movement of his or her arms.

[0027] In particular, the above-mentioned view is based on the fact that the curvature of line 14 seen by the player can be changed by adjusting the attachment position of shaft 11 to head 13, and that the degree of open face or hook face changes depending on this change in curvature.

[0028] A player can adjust the attachment position of the shaft 11 relative to the head 13 to suit himself / herself. Adjusting the attachment position here means rotating the shaft 11 in the axial direction as appropriate to adjust the appearance of the line 14. In particular, when the first line 14a and the second line 14b are connected to each other on the head 13 side, the sharpened tip of the connected portion can be used as an alignment mark when attaching the shaft 11 to the head 13, making it easier to make fine adjustments.

[0029] In another embodiment, instead of connecting the first line 14a and the second line 14b to each other on the head side, as shown in the development explanatory view of Fig. 3(b), a straight line portion on the grip 12 side may be shared and bifurcated on the head 13 side to form the first line 14a' and the second line 14b'. In this case, the curvature of the curve of the first line 14a' and the second line 14b' can be made larger.

[0030] Alternatively, as yet another embodiment, as shown in FIG. 3(c), a straight portion on the grip 12 side may be shared, a first line 14a' and a second line 14b' may be formed which are bifurcated on the head 13 side, and an extension line 14" may be provided between the first line 14a' and the second line 14b' in a straight line, forming a trifurcated shape. [Explanation of symbols]

[0031] 10. Golf Clubs 11 Shaft 12 Grip 13 Head 14 lines 14a,14a' First line 14b,14b' Second line 14” extension line

Claims

1. A golf club shaft having a line of a predetermined width extending from the grip side to the head side on the circumferential surface thereof, The line is curved along the circumferential surface as it extends toward the head.

2. 2. The shaft for a golf club according to claim 1, wherein the line is straight on the grip side between the grip and the head, and curved on the head side.

3. 3. The golf club shaft according to claim 2, wherein the lines are a first line that curves in a clockwise direction as it extends toward the head side, and a second line that curves in a counterclockwise direction as it extends toward the head side.

4. 4. The shaft for a golf club according to claim 3, wherein the first wire and the second wire are joined to each other on the head side.

5. A golf club having the golf club shaft according to any one of claims 1 to 4 attached thereto.

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