JPH119730A - Golf club group having series relation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize the physical disorder in swinging of different kinds of clubs within a series, perform a swing in the same stance, and provide stable directivity by providing plural kinds of golf club groups constituting a series relation the same club counts of which have the same toe down quantity ratio. SOLUTION: Figs (a)-(c) show a wood golf club series showing counts #1(X), #1(Y), #1(Z) of different kinds of wood golf clubs with the same club count. This series consists of three wood golf clubs #1(X), #1(Y), #(Z) differed in kind, for example, such as a loft angle, a center-of-gravity height, a center-of-gravity depth, a lie angle, a face angle, a head volume, a total weight or the like, and the toe down quantities of the respective golf clubs are set to be constant. An identification mark P corresponding to the toe down quantity ratio is preferably displayed on a part of the club shaft 12 of each wood golf club 11, and α1 -α3 show the loft angles of the wood golf clubs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a group of golf clubs having a series relationship with each other, and more particularly, to a series relationship in which a plurality of types of golf clubs have a substantially constant toe down ratio of golf clubs of the same club number. The present invention relates to a group of golf clubs.

[0002]

2. Description of the Related Art Generally, when a golf club manufacturer sells a golf club, if each club number is sold as a single item, even if the club numbers are the same (for example, # 1), depending on the type of the club, Two or more golf clubs having different types of loft angle, height of center of gravity, depth of center of gravity, lie angle, face angle, head volume, total weight, and the like may be sold as a single golf club series.

[0003] On the other hand, when a general consumer selects and purchases a golf club for each count, or selects and purchases a golf club having only a count in a club set that he or she owns, the form, color, and the like are changed. In general, a method of selecting a golf club and selecting a golf club corresponding to a golfer's own head speed is used. Incidentally, as a factor for a general consumer to select a golf club, there is a so-called toe-down characteristic provided in each golf club, in addition to the above-described head speed and the like.

[0004] The toe-down characteristic impairs the directionality of the ball due to the toe-down phenomenon when the golf club swings, and cannot be controlled at the above head speed. The toe-down phenomenon means that the center of the face of the club head is aligned with the center of the tee-up golf ball, and then the club shaft is subjected to the centrifugal force and gravity acting on the club head when the golf club swings. This is a phenomenon in which the center of the face of the club head moves inward with respect to the center of the golf ball by bending, and refers to the amount of movement when the club head is pulled toward the player when the golf club swings. The amount of movement from the center is called the toe down amount.

[0005] This toe-down phenomenon is caused, for example, by the fact that the position G of the center of gravity of the club head 1 is generally 30 mm to 50 mm from the axis XX of the club shaft 2 as shown by symbol e in FIG.
(In the case of a wood golf club head)
When the golf club swings, the shaft 2 bends as shown by the dashed line in FIG. 3 due to the action of the centrifugal force and the gravity applied to the club head 1 so that the club head 1 tends to be drawn toward the player (in the direction of the arrow in the figure). It arises from the force of doing.

[0006]

Generally, golf clubs sold as a golf club series have different so-called toe-down characteristics possessed by the same number. That is, in several sets of golf club series consisting of several types of golf clubs called the same series,
Naturally, the toe-down characteristics of the first hand vary.

For this reason, if a wood golf club of the same count, for example, count # 1 is purchased separately from the same series and a new set is constructed, the count # 1 used previously is used.
Swinging with the same stance resulted in different toe-down amounts, resulting in different positions for catching the ball on the club face. Note that the same stance means that the ball is aligned at the same and similar portion of the club face surface at the time of addressing. As a result, the trajectory of the ball is greatly varied from side to side, and when not hitting at an ideal point, there is a fatal defect for a golf club that the intended flight distance is impaired.

[0008] Therefore, as a selection factor of the golf club,
Even if the above-mentioned head speed is uniquely selected, it is difficult to always obtain the maximum flight distance, and in order to obtain a stable direction of the hit ball, a so-called toe-down phenomenon selects a golf club. Turned out to be important. An object of the present invention is that when two or more golf clubs of different types within the same series are swinging, a sense of incongruity is small, and the stance can be made to be the same, and a stable direction can be always obtained. An object of the present invention is to provide a series of golf clubs that can be related to each other.

Another object of the present invention is to display an identification symbol for identifying that the golf clubs have substantially the same toe-down amount ratio for each same number so that the golf clubs can be identified. Another object of the present invention is to provide a group of golf clubs in a series that enables a user to be compatible with each other without worrying about the toe-down phenomenon.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, golf clubs having the same club number in a plurality of types of golf clubs constituting a series have substantially the same toe-down amount ratio. The gist is that. As described above, in the different types of golf clubs in the series, by setting the toe down amount ratio of the golf clubs between the same club numbers to be substantially constant,
Even if a general golfer selects a golf club without knowing the toe-down phenomenon and purchases and uses it, the feeling of discomfort between the counts is small, and even with different types of golf clubs it is possible to swing with the same stance Thus, a stable direction can always be obtained.

Furthermore, by displaying an identification symbol for identifying that the golf clubs have substantially the same toe-down amount ratio for each same number, the golf clubs can be identified by the same toe-down amount ratio. If so, even a newly purchased golf club can swing with the same stance, and a stable direction can always be obtained.

Here, the toe-down amount ratio is a ratio of the equivalent toe-down amount of each club described in the embodiment described later to the ratio of another club to another club.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the "equivalent toe down amount" is calculated as follows, and will be described in detail as follows. That is, referring to the wood golf club of FIG. 3, the centrifugal force (F) caused by swinging the golf club is expressed as follows.

The symbols in the following formulas have the following meanings. ω: Rotational angular velocity unique to each golfer e: Head center of gravity distance from shaft axis r: Club length r ₀ : Length of player's arm m: Head mass F: Centrifugal force due to swinging golf club M: Moment (M ) (EI) _eq : Equivalent bending stiffness of the shaft F = mRω ² (where R = r + r ⁰ ) (1) By this centrifugal force (F) and e (distance of the center of gravity of the head from the shaft axis), A moment (M) occurs.

M = eF = emRω ² (2) The moment (M) causes the shaft to bend under bending deformation. When this amount is defined as an equivalent toe down amount δ _eq , the following is obtained.

[0016]

(Equation 1)

However, in the above equation, the bending stiffness (EI) of the shaft is preferably the integral value of the stiffness distribution over the entire length of the shaft. EI) Use _eq .

Here, three-point bending refers to a span 800
A value obtained by measuring the reaction force when the pressure contactor was displaced by 50 mm from the position of 650 mm from the tip end of the shaft itself in mm was used. As a result of such a phenomenon, the club head 1
Of the center P (generally, a sweet spot) of the face surface 3 is a predetermined distance L from the address position to the player side.
(Generally about 5 mm to 30 mm), and the center P of the face surface 3 of the club head 1 is shifted toward the toe side and hits the ball with respect to the center of the tee-up golf ball Q.

For this reason, the direction in which the golf ball Q is launched is not determined, and a phenomenon has occurred in which the player does not fly in the target direction aimed by the player or becomes unstable. Further, when the position of hitting the golf ball Q is deviated due to the toe-down phenomenon, the maximum resilience characteristic of the club head 1 cannot be obtained, and the probability of impairing the flight distance also increases.

For example, in order to actually evaluate a newly designed golf club according to the present invention, a golf club is mounted on an arm of a swing robot, and a golf ball Q is applied to the center P of the face surface 3 of the club head 1 at the address. When the golf ball Q was swinging with the positioning, the golf ball Q hardly flew straight. Therefore,
The present inventors have conducted various studies and experiments in order to solve the above-described phenomenon, and as a result, have found that one of the causes of the golf ball Q not flying straight is the above-described toe-down phenomenon. Obtained.

[0021]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 (a) to 1 (c) show the same club count (count # 1 of a wood golf club in this embodiment).
) Indicates a wood golf club series indicating the counts # 1 (X), # 1 (Y), and # 1 (Z) of three different types of wood golf clubs 11.

This wood golf club series includes, for example, three wood golf clubs # 1 (X) having different types such as loft angle, height of center of gravity, depth of center of gravity, lie angle, face angle, head volume, and total weight. ), # 1 (Y), # 1
(Z), the toe-down amount δ of each golf club is set substantially constant. FIGS. 2 (a) to 2 (c)
Are the same club numbers (in this embodiment, iron golf club numbers # 3 are shown), and iron numbers # 3 (X), # 3 of three different types of iron golf clubs 13
3 shows an iron golf club series indicating 3 (Y) and # 3 (Z).

This iron golf club series also has a loft angle,
Three iron golf clubs # 3 (X), # 3 (Y), and # 3 (Z) having different types such as center of gravity height, center of gravity depth, lie angle, face angle, head volume, and total weight. But,
The toe down amount ratio of each golf club is set substantially constant.

A part of the club shaft 12 of the wood golf club 11 shown in FIGS. 1A to 1C and FIG. 2A
It is preferable for selection to display an identification symbol P corresponding to the toe down amount ratio λ _ij on a part of the club shaft 14 of the iron golf club 13 shown in (c). Also, α ₁
α ₃ is wood golf club 11 and β ₁ ~β ₃ shows the loft angle of the iron golf club 13.

According to the present invention, in a golf club series including two or more golf clubs of different types (characters) between the same club numbers, the toe-down amount ratio λ _ij of the golf clubs between the same club numbers is set to be substantially constant. By doing so, even when swinging the golf club, the sense of incongruity is small, the swing can be made with the same stance, and a stable direction can always be obtained.

The tow-down amount ratio λ _ij is 0.9 to
It is preferably set to 1.1. Table 1 below shows three wood golf clubs # 1 of the golf club series.
(X), # 1 (Y), and # 1 (Z) show directional variations when used. This example and the comparative example show the results when the top amateur hits 50 times. is there. The wood golf club used was a driver (#
In 1), the head speed is Hs (34 m / Sec).

[0027]

[Table 1]

As is apparent from Table 1 above, in a golf club series including two or more golf clubs of different types (characteristics) between the same club numbers, the toe down amount of the golf club between the same club numbers is substantially reduced. By setting to a constant value and selecting and using a club having the same toe-down amount ratio, compared to the comparative example, variation in directionality is small, and when swinging a golf club, a sense of incongruity is small, and the stance is the same. You can swing,
A stable direction can always be obtained. Further, it is preferable to set the toe-down amount to 0.9 to 1.1.

[0029]

According to the present invention, the golf clubs of the same club number in the plurality of types of golf clubs forming the series relationship as described above have substantially the same toe-down amount ratio with each other. Also, when swinging two or more different types of golf clubs in the same club count, a sense of incongruity is small, and the swing can be made with the same stance, so that a stable directionality can always be obtained.

In addition, by displaying an identification symbol for identifying that the golf clubs have substantially the same toe-down amount ratio for each same number, it is possible to identify the golf clubs so that a newly purchased golf club can be used. Even if there is, it is possible to swing with the same stance, and it is possible to always obtain a stable direction.

[Brief description of the drawings]

FIGS. 1 (a) to 1 (c) show counts # 1 (X), # 1 (Y), and # 1 (Z) of three different types of wood golf clubs of the same club count according to the present invention. FIG. 1 is a schematic configuration diagram of a wood golf club series shown in FIG.

2 (a) to 2 (c) show the iron club numbers # 3 (X), # 3 (Y), and # 3 (Z) of three different types of iron golf clubs between the same club numbers according to the present invention. FIG. 1 is a schematic configuration diagram of an iron golf club series showing the above (1).

FIG. 3 is an explanatory diagram of a toe down amount in a general wood golf club.

[Explanation of symbols]

11 Wood Golf Club 12 Club Shaft 13 Iron Golf Club 14 Club Shaft α _{1 to} α ₃ Loft Angle of Wood Golf Club β _{1 to} β ₃ Loft Angle of Iron Golf Club P Identification Symbol

Claims (5)

[Claims] 1. A golf club of the same club number in a plurality of types of golf club groups constituting a series relationship,
A series of golf clubs having substantially the same toe down ratio. 2. The toe-down amount ratio of golf clubs of the same club number in the plurality of types of golf club groups,
2. The series-related golf club group according to claim 1, wherein the group is set to 0.9 to 1.1. 3. The series-related golf club group according to claim 1, wherein the golf club group comprises a wood golf club. 4. The series related golf clubs according to claim 1, wherein the golf clubs are iron golf clubs. 5. The golf club of the same club number,
5. The series-related golf club group according to claim 1, wherein an identification symbol for identifying that the golf clubs have substantially the same toe-down amount ratio for each same count is displayed.