JPS5897375A - Wood club set - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wood club set comprising a plurality of wood clubs having a correlation with the present invention.

Generally, the face of a wood club is slightly convex and has a diameter of approximately 25 mm.
It is a curved surface with a radius of around 3. Here, the radius in the horizontal direction is called the bulge radius.

By the way, this bulge radius in conventional M-type love sets is considered to be constant regardless of the wood club count (usually from Ml to Muro). Table 381 shows an example of the wrinkle bulge radius of a conventional standard club set, and the loft angle, moment of inertia value, and distance from the face of the center of gravity of the club.

Table 1 Then, assuming that a general golfer uses the conventional club set shown in Table 1, hit the ball with a swing machine from the sweet spot to the toe with a point of 15g, and determine the flight distance of the ball at nine.・Table 92 shows the measurement results of the left and right pre (misalignment) of the point of fall and the amount of side spin.

(Next page) Table 2 As is clear from Table 1, Wood AI has no right or left play at the ball's landing point, but is there a bf? /
)”The left and right play increases as the number increases from A8 to A4-A3.

Of course, if the sweet spot on the face of the wood club and the center of impact of the ball were completely separated, this kind of side-to-side play would not occur at all, but for an ordinary golfer who is in the 1s level, Since the center of the ball is usually off the sweet spot, the direction of the ball is deviated from the ball with high-numbered wood clubs as shown in Table 2 above. In addition, if you hit the ball closer to the heel part of the Sweet Spot Ep, the ball will hit the same high count (on the left).
There was a big play.

The present invention solves this difficult conventional drawback, and when a general golfer hits the ball off the sweet spot, the ball returns to the center regardless of the number of wood clubs in the wood club set. The purpose is to minimize the left and right O-pre.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

As shown in Figure 311, when hitting the ball (3) with the face (2) of the head (1), it is a sweet spot) C
If you remove P) and hit the ball at the center of impact near the toe (4), a force will be applied to rotate the head (1). Assuming that the center of gravity of the head (1) is the rice grain, and the distance to the extension m of the external force vector given by the ball) to the point is *t (kl), the magnitude of this rotational impact moment is (FXhs
), and when the head (1) rotates around the center of gravity (Bo at a rotational speed of K (→), the point (A) C, (・X AG )
It moves in moderation. And in the wE1 diagram, 7 aces (2)
is shown as a planar case, but generally this face (
2) Halo 181 As shown in the figure, it has a slightly convex shape, and point a indicates the center of the bulge, and the symbol @ is the so-called bulge radius. ), the magnitude of the rotational impact moment that the ball (3) gives to the head (1) is the center point of the point prisoner and the bulge (6)
Straight to tie! (51K The length of the perpendicular drawn from the center of gravity Q is h
2), (FXhx) and h, < h, so in the case of Figure 2, it is jp! Compared to the case in Figure 1, the value of the rotational impact moment is smaller, and the head (1)
The instantaneous rotational movement of one heart is reduced. Therefore, as shown in Figure 8, the ball (3) and club head (1)
It can be seen that the gear action of the ball (3) decreases, the side spin amount (n) of the ball a1 decreases, and the amount of bending of the ball (3) during flight decreases. Figure 4 shows this in more detail, and Figure (I) shows a flat face corresponding to Figure 1, with the bulge radius (6) increasing to infinity, and the value of the rotational impact moment increasing. Since the ball is large, the gear action between the ball (3) and the head (1) is large, and the ball (31) is given too much side spin, causing a large curve during flight and preventing it from falling near the center.

Todoroki 6 In other words, in the same figure (D), if you hit with a dot on the toe part (4), it will create a pre of distance 0 to the left, and conversely, if you hit with the heel part (point (6) near 61), A play is generated by the distance ■ to the right. Next, in the same figure (ID shows the case with an appropriate bulge radius (2)), the ball (31) receives an appropriate side spin, returns to the center, and falls. However, the [phase] in the figure shows a case where the bulge radius ■ is set extremely high, and the deviation in the direction of ball launch is large, and as explained in Figure 2, the amount of side spin decreases. Part (4)
When you hit with a point (6) that is off the sweet spot (P), it will cause a play to the right, and when you hit with a point (6) that is off the heel (6), a play will occur to the left, near the center. It will not fall.

Therefore, the optimal bulge radius (6) for wood clubs
Determining this is extremely difficult.

However, club set I consisting of multiple wood clubs
CTAs, even though the position of the head center of gravity, loft angle, and moment of inertia differ for each club, conventional wood club sets have the same bulge radius regardless of the club, as shown in Table 91. Because (2) was applied, as shown in Table 2, even if one count in the set had an optimal bulge radius with no left-right wobble, the remaining counts had 4 large left-right shakes. It is expected to be@
So, in the wood club set of the present invention, breaking the conventional wisdom, the bulge radius (6) is changed sequentially for each number of wood clubs, and specifically, the bulge radius (6) of the higher number of wood clubs is changed. It is configured by sequentially increasing settings. Moreover, it is desirable that the bulge radius (1) be increased by 10 to 50 S as the height increases.

However, according to numerous measurement results, if you hit less than lon, the phenomenon that the ball (3) deviates far from the center with a high-count wood club is noticeable, as shown in Figure 4 (To). On the other hand, if the bulge radius @ is gradually increased beyond 50%, the phenomenon in which the ball a) deviates significantly from the center of a high-count wood club becomes noticeable, as shown in Figure 4 (I).

Therefore, we changed only the bulge radius (■) at the knee of the standard club set (conventional) shown in Table 1 so that it increases in increasing order for higher clubs, and The radius ■ is 1g6・86 urn 4y・55 (1:
11) Set K and swing spot P) using the swing machine (4)
The result when hitting the ball (3) with a pitcher is as follows:
Shown in the table.

Table 8 Comparing this Table 8 with Table 2 of the conventional example, 1. With the club set according to the present invention, the amount of side spin is almost constant, and the left and right wobbling is completely eliminated.P, the ball is near the center. It is clear that a significant improvement has been achieved, such as the concentration of falls on the ground.

In addition, sweet spot exposed ex-heal part 181 side A
When he missed the ball and hit the ball (3), almost the same good results were obtained.

Next, in FIG. 111 shown in FIG. 185, (2) is the batting face, and the orthogonal coordinates are taken with the sweet spot P) as the origin, with the X axis being the horizontal direction and the y axis being the vertical direction.

The hitting center point is (4), the impact force due to the ball hitting acting on this point (tcF), and the center of gravity t'' (Gt) (Gg) of two club heads with different counts taken on the X axis.
The center of gravity (G l) (Gz) and each face (distance from the wound are (Ll) (Lx). Then, (a)
Distance υ of center of gravity from face, (b) Loft angle,
(c) The relationship between each moment of inertia of the head and the amount of side spin of the ball is as follows.

0) Distance from the face to the center of gravity (color) This distance υ
In the case of a small p1 oka-bulge radius, the head (1) is considered to rotate around this center of gravity, so the head (1) rotates in the direction perpendicular to the line connecting the center of gravity and the center of gravity. (17 starts moving. Let its velocity be M, and the velocity (V) (D It is a component that causes spin.In the 885 diagram, 11>7
m tehbtl"b, Vt>Vt t'&b.

However, the y component U, VtC)' that causes spin
)<Vt(y). Therefore, with the same bulge radius, as the position of σ, center of gravity - approaches the face (2) and υ becomes smaller, the rotational impact force increases, but the amount of side spin of the ball decreases.

(b) When the loft angle is high, the loft increases and the component of the ball traveling direction of the head (1) decreases, so the reaction force of the head (1) decreases in the face (2).
The force that suppresses the rotation also decreases, and the amount of side spin decreases.

(c) Moment of inertia center of gravity - A small moment of inertia with respect to the axis perpendicular to the paper surface means that the head (1) rotates easily. The amount of spin increases.

As mentioned above, (a) middle) decreases the amount of side spin as the number increases, and conversely increases it to (c), so the competition (overall) of elements (a), (b), and (c) when it comes to the ball. Obtain the side spin amount as a result. However, in reality, the combined effect of the above factors (a) and (b) has a greater influence than the other (c) factors, and as the number increases, the amount of side spin decreases. Therefore, the ways to improve the side spin so that it does not decrease too much even with a high number are (a) the distance from the center of gravity to the face, (b) the loft angle, and (c)
It turns out that one or more of the moments of inertia can be changed. However, it is extremely difficult to significantly change the shape and weight of the head (1) that has been popular among golfers. Therefore, in the present invention, we changed the bulge radius @ without changing the shape or weight of the head (1) of the wood club that has been familiar to many golfers, and the bulge radius It can be seen that this is a very good idea, as it has been improved to prevent the decrease in the amount of side spin for high-count golfers and to obtain a sufficient amount of side spin.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and the present invention is free to change the design, for example, the number of clubs in the set can be increased or decreased. It is also preferable to change the number for each number of heads (1) in combination with the above. For example, for a high count, the bulge radius ■ is increased and the amount of change in the distance υ from the face (2) of the center of gravity is set to be smaller than that of the conventional one. In the present invention, the term "wood club" refers to any type of club made of any material as long as it has a conventional backside shape, and includes, for example, a wood-shaped metal club, a metal-wood composite club, and the like.

As described above, in the present invention, the bulge radius (6) is set to be larger in order for higher clubs. Therefore, an ordinary golfer can use any wood club of any club number in the set and hit the ball ( 3), the ball (3) returns to the center with optimal side spin, and the left and right play is always minimized. Furthermore, changing the bulge radius (6) of the club head (1) is extremely easy to implement in terms of manufacturing, and it also spoils the image of the club head (υ), which has traditionally been familiar to many golfers. without any
It has the advantage of being practical.

[Brief explanation of the drawing]

11111i@lt: r A plan view illustrating the rotation of the head when hitting a ball with a head having a flat face, ms diagram U The same plan view for a head with a bulge,
Fig. 8 is a plan view of the hole to explain the gear effect, Fig. 4 is a plan view to explain the bulge effect, l! Figure 6 shows a diagram for analyzing the relationship 4ik between the amount of side spin and the position of the center of gravity of the head.
This is Figure 11. R...bulge radius, (1)... spatula F, (21...
・Face, G)...Ball. Patent applicant: Sumitomo Rubber Industries, Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A wood club set comprising a plurality of wood clubs whose bulge radius (■) is set to be sequentially larger. 2. As the height increases, the bulge radius (6) increases to 10
A wood club set according to claim wL1 which increases by 50%.