JP2000202069A - Golf club - Google Patents

Abstract

(57) [Problem] To provide a golf club capable of maximizing the initial velocity of a ball when hitting a ball. SOLUTION: A position 170 mm from a grip end 2e.
Inertia moment ^{_{M 17 0 (g · cm 2}} ) is the club length relative to S (inch), (0.06 × S-0.68) × 10 6 <M 170 in
<(0.06 × S−0.48) × 10 ⁶

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elongated golf club, and more particularly, to a golf club capable of maximizing the initial velocity of a ball when hitting a ball.

[0002]

2. Description of the Related Art In golf, the flight distance of a ball is greatly affected by launch angle, initial velocity, and back spin.
Of these, the initial velocity of the ball depends on the head speed and meet rate of the golf club, and the meet rate changes based on the head mass. For example, in a general driver, the above-mentioned meet ratio (initial speed / head speed) is 1.45 to 1.50.
Is in the range.

In recent years, golf clubs have tended to be longer in order to improve the flight distance of balls. When the golf club is lengthened in this way, it is a general design method to reduce the weight of the head and adjust the balance. However, in this case, the head speed is increased by lengthening the club, but the meet rate is reduced by reducing the head mass, so it is not possible to obtain a sufficient initial speed, and it is possible to take advantage of the advantage of the lengthening. There was a problem that it was not possible.

On the other hand, in golf clubs having the same club length but different balances (moment of inertia), the lighter the head mass, the smaller the inertia moment and the faster the head speed. Because of the decrease, it was not possible to obtain a sufficient initial speed. Conversely, if the head mass was too large (the moment of inertia was too large), a sufficient initial speed could not be obtained this time due to a decrease in head speed.

[0005] As a means for adjusting the balance, 1
While adjusting to balance indicator 4-inch type a guide has been widely in ordinary golf club, the combined balance near D ₀ standard in balance indicators 14-inch system, enough initial velocity The resulting elongated golf club could not be obtained.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a golf club capable of maximizing the initial velocity of a ball when hitting a ball.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, a golf club according to the present invention has a length of 170 mm from a grip end.
Moment of inertia M ₁₇₀ (g · cm ² ) at the position of (0.06 × S−0.68) × 10 ⁶ <
M ₁₇₀ <(0.06 × S−0.48) × 10 ⁶ .

[0008] By setting the above relationship between the moment of inertia M ₁₇₀ and the club length S, the initial velocity of the ball at the time of hitting the ball can be maximized, and the length of the golf club can be increased. We can make the most of that merit.

Although the present invention is applicable to golf clubs having any club length, a remarkable effect can be obtained particularly when applied to a long golf club of 48 inches or more.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 illustrates a golf club according to an embodiment of the present invention.
In the figure, a grip 2 is mounted on a butt side of a club shaft 1, and a club head 3 is mounted on a tip side.

In the above golf club, the grip end 2
moment of inertia M at position A 170 mm from e
₁₇₀ (g · cm ² ) is the club length S (inch),
(0.06 × S−0.68) × 10 ⁶ <M ₁₇₀ <(0.06 × S−0.4
8) It is set to have a relationship of × 10 ⁶ .

This relationship is obtained based on experimental results. For example, if the club length S is 48 inches or 50 inches
Ten golf clubs having different moments of inertia were prepared for each ch, and a test hit test was performed by manual driving. As a result, it was found that the same tendency was observed in the head speed in golf clubs of any club length.

That is, a club having a smaller moment of inertia has a higher head speed, but a smaller head mass results in a lower meet ratio. Conversely, a larger moment of inertia (larger head mass) results in a higher head speed despite a higher meet ratio. It will fall. Since the ball speed is obtained by multiplying the head speed and the meet rate, the relationship between the moment of inertia and the ball speed eventually becomes a distribution like a quadratic function convex upward, and the optimum moment of inertia is centered on the local maximum value. Was found to have a range. Moreover, it was also found that the range of the optimum moment of inertia shifted to a larger value as the club length S became longer.

Therefore, as described above, the moment of inertia M
₁₇₀ is calculated as (0.06 × S−0.68) × 10
By setting the relation of ⁶ <M ₁₇₀ <(0.06 × S−0.48) × 10 ⁶ , the initial velocity of the ball can be maximized. When the moment of inertia M ₁₇₀ too small initial velocity is reduced due to a decrease in meat ratio, it is too large in the opposite by a decrease in head speed initial speed decreases.

In the present invention, the moment of inertia M ₁₇₀ at a position 170 mm from the grip end is used. This is because the position of the right index finger (when right-handed) when the golfer holds the golf club corresponds to the above position.
A person's swing can be approximated by a combination of a rotational movement around the shoulder and a rotational movement due to the return of the wrist.
Moment of inertia M ₁₇₀ of the club is considered to greatly affect the latter movement, the result of the swing analysis, movement by return of the wrist was confirmed to be rotated around the tip of the right index finger.

At a position 170 mm from the grip end,
Moment of inertia M₁₇₀(G · cm ^Two) Is shown in FIG.
Thus, the moment of inertia M at the center of gravity of the club_G(G ・
cm ^Two) And the distance from the grip end to the center of gravity of the club
L (cm) and the total weight of the club m (g)
It can be obtained from equation (1).

M ₁₇₀ = M _G + m × (L−17) ² (1) As the club shaft used in the present invention, the position of the center of gravity of the shaft alone is 53 of the total length of the shaft from the tip side.
It is preferable to use the one at the position of ~ 58%.
The center of gravity of the club shaft is defined as the percentage of the length from the balanced position to the tip end (head side) with respect to the total length of the shaft when the shaft alone is laid down and balanced at an arbitrary position in the longitudinal direction as a fulcrum. It is represented by By using the club shaft having the above balance, the initial speed of the elongated golf club can be more effectively improved.

[0018]

[Example] Club length S and 170 mm from grip end
The golf clubs of Comparative Examples 1 to 6 and Examples 1 to 11 in which the moment of inertia M ₁₇₀ (g · cm ² ) at the position of was varied.

For these golf clubs, test hits were performed by several testers, and the initial velocity of the balls at that time was measured. The average results are shown in Table 1. The measurement results were indicated by an index with Comparative Example 1 being 100. The larger the index value, the faster the initial velocity of the ball. Table 1 also shows the ratio (%) of the distance from the tip side of the club shaft alone to the position of the center of gravity to the entire length of the shaft.

[0020]

[Table 1]

As can be seen from Table 1, when the club length S is 48 inches, M ₁₇₀ = 2.2 × 10 ⁶ to 2.4 × 10 ⁶
In the golf clubs of Examples 1 to 9, the initial velocity of the ball was significantly higher than that of the golf clubs of Comparative Examples 1 to 6. Further, when the club length S is 50inch and 52inch had shifted towards larger range of M ₁₇₀ for obtaining the maximum initial velocity.

[0022]

As described above, according to the present invention, the moment of inertia M ₁₇₀ at a position 170 mm from the grip end is specified in association with the club length S, so that the initial velocity efficiency of the golf club is set optimally. be able to. Therefore, by setting the moment of inertia M ₁₇₀ properly with elongation of the club can be improved to maximize the initial velocity of the ball at the time of hitting.

[Brief description of the drawings]

FIG. 1 is a side view showing a golf club according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating a method for measuring an inertia moment M ₁₇₀ at a position 170 mm from a grip end.

[Description of Signs] 1 Club shaft 2 Grip 2e Grip end 3 Club head S Club length A Position 170 mm from grip end

Claims (2)

[Claims] 1. An inertia at a position 170 mm from a grip end.
Sexual moment M₁₇₀(G · cm^Two) Is the club length S (inc
h), (0.06 × S−0.68) × 10⁶<M ₁₇₀<(0.
06 × S−0.48) × 10⁶Characterized by the relationship
Ruff club. 2. The golf club according to claim 1, further comprising a club shaft in which the center of gravity of the shaft is 53 to 58% of the entire length of the shaft from the tip side.