JPH119726A - Golf club group related to series - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize the physical disorder in swinging of different clubs, and regularly provide a maximum flying distance and stable directivity by providing plural kinds of golf club groups having the same head speed and constituting a series relation the same club counts of which have the same toe down quantity ratio. SOLUTION: This golf club series consists of three wood golf clubs 11 of different kinds with the same head speed and the same club count #1(X), #1(Y), #1(Z). Namely, this series consists of three wood golf clubs differed in kind 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, but the respective toe down quantity ratios are set to substantially equal to each other. An identification mark P corresponding to the toe down quantity corresponding to the head speed is displayed on a part of the shaft 12 of this golf club to display the unified head speed and toe down quantity of the wood golf club set.

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 plurality of types of golf clubs in which the head speeds of golf clubs of the same number are substantially the same and the toe down amount is reduced. The present invention relates to a golf club group having a substantially constant series relationship.

[0002]

2. Description of the Related Art In general, when a golf club is purchased for each golf club, or when a club set of a certain golf club is selected and purchased in a club set owned by the golf club, for example, the golfer's own head speed (the club head is Just before hitting the ball, the club head speed for about 10 cm: the head speed (v = rω) of a typical male golfer is
(Approximately 37 to 40 m / sec).

That is, as a means for a general golfer to select a wood golf club, for example, apart from the appearance and shape, for example, a head speed as an element for obtaining a maximum flight distance is used as a first criterion, The launch angle and the number of revolutions of the ball for obtaining the ideal trajectory that maximizes the head speed are used as means for selection. The launch angle is determined by the head speed and the loft angle of the club head. The most efficient launch angle is about 10 to 16 degrees, and the optimal rotation speed of the ball launched at that launch angle is 2000 to 2800 rpm. The number of rotations.

As described above, when purchasing a new wood golf club, it is common to purchase a wood golf club having substantially the same head speed and incorporate it as a set, considering the head speed as a primary consideration. Met.

In general, 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), the loft may vary depending on the type. Angle, height of center of gravity, depth of center of gravity, lie angle, face angle, head volume,
In some cases, two or more golf clubs having different types such as the total weight are sold as a single golf club series.

Incidentally, as a factor for a general consumer to select a golf club, in addition to the above-described head speed and the like, there is a so-called toe-down characteristic provided in each golf club. The toe-down characteristic is such that when the golf club swings, the directionality of the ball is impaired by the toe-down phenomenon, and cannot be controlled by the above-mentioned head speed.

The toe-down phenomenon refers to the effect of the centrifugal force and gravity exerted on the club head when the golf club swings when the center of the face of the club head is aligned with the center of the teeed golf ball. A phenomenon in which the center of the face of the club head moves inward with respect to the center of the golf ball when the club shaft is bent, and the amount of movement when the club head is pulled toward the player when the golf club swings. The initial movement from the center is called the toe-down amount.

The toe-down phenomenon is caused, for example, as shown by a symbol e in FIG. 3 when 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.
(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.

[0009]

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.

[0010] Therefore, when the same number, for example, a wood golf club of the number # 1 is purchased separately from the same series and a new set is constructed, the number # 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 has a large variation in the right and left direction, and when the ball is not hit at an ideal point, there is a fatal defect for a golf club that a desired flight distance is impaired. Therefore, even if the above-described head speed is uniquely selected as a golf club selection element, it is not always possible to obtain the maximum flight distance, and in order to obtain a stable directionality of the hit ball, a so-called,
The toe-down phenomenon has been found to be important in selecting a golf club.

[0012] It is an object of the present invention to provide a golf club group having substantially the same head speed and the same number in a plurality of types of golf club groups forming a series relationship having substantially the same toe-down amount ratio. By making a series of golf clubs related to a series, golfers can swing two or more different types of golf clubs in the same series with less discomfort and swing with the same stance, always It is an object of the present invention to provide a series of golf clubs in a series relationship capable of obtaining a maximum flight distance and a stable direction.

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 series of golf clubs that can make a user compatible with the number of golf clubs according to his or her preference.

[0014]

In order to achieve the above object, the present invention has a head speed substantially the same as each other,
In addition, the gist is that golf clubs of the same number in a plurality of types of golf club groups forming a series relationship are a group of golf clubs in a series relationship having substantially the same toe-down amount ratio.

As described above, in a group of golf clubs of the same head speed type in the series, by setting the toe-down amount ratio of the golf clubs between the same counts to be substantially constant, another type of golf club of the same count is set. Even if it is changed to a club, it is possible to swing with the same suntus, and it is possible to always obtain the maximum flight distance and stable directionality.

Here, the toe-down amount ratio is a ratio of an equivalent toe-down amount of each club described in an embodiment to be described later with respect to a certain club as compared with other clubs.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the toe-down phenomenon means that the center of gravity G of the club head 1 is generally 30 mm to 50 mm from the axis XX of the club shaft 2 as shown by the symbol e in FIG. Wood golf club)
It is about a distance away and when you swing a golf club,
Due to the action of the centrifugal force and the gravity acting on the club head 1, the club shaft 2 bends as shown by the one-dot chain line in FIG. 3 to generate a force for pulling the club head 1 toward the player (in the direction of the arrow in the figure).

Such a phenomenon is described in detail as follows. 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. v: Head speed e: Distance of the center of gravity of the head from the shaft axis r: Club length m: Head mass F: Centrifugal force due to swinging the golf club M: Moment (M) (EI) _eq : Shaft equivalent bending stiffness F = mv ² / r (1) A moment (M) is generated by the centrifugal force (F) and e (distance of the center of gravity of the head from the shaft axis).

M = eF = emv ² / r (2) This moment (M) causes the shaft to bend due to bending deformation. When this amount is defined as an equivalent toe down amount δ _eq , the following is obtained.

[0020]

(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, but here, the equivalent stiffness by three-point bending (known in the golf industry) is used. EI) Use _eq .

Here, the 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 time of addressing. When the golf ball Q was swinging with the positioning, the golf ball Q hardly flew straight.

The inventors of the present invention have conducted various studies and experiments in order to solve the above-mentioned phenomena, and as a result, one of the causes of the golf ball Q not flying straight is the toe-down phenomenon described above. I got some knowledge.

[0026]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIGS. 1A to 1C show three wood golf clubs 11 of different types with the same head speed and the same club count (in this embodiment, the count # 1 of the wood golf club is shown). # 1 (X), #
1 shows a wood golf club series indicating 1 (Y) and # 1 (Z).

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 ratio λ _ij of each golf club is set to be substantially constant.

An identification symbol P corresponding to the toe-down amount (δ) mm corresponding to the golf club head speed (m / Sec) is displayed on a part of the golf club shaft 12 showing the embodiment of the present invention. As a wood golf club set, a unified head speed (m / Sec) and a toe-down amount (δ) mm are displayed.

That is, when the head speed (m / Sec) is 4
When 0 (m / Sec) and the symbol M in which the toe-down amount (δ) mm is converted in accordance with the head speed is displayed, as shown in FIG. It is indicated on the shaft 12 of the entire set. Also,
α _{1 to} α ₃ indicate the loft angles of the wood golf club 11 and the β _{1 to} β ₃ iron golf club 13.

The head speed M-40 is 44
Immediately before hitting the ball, the # 1 driver's club head using an inch carbon shaft
Club head speed Hs (m / Sec) during 0cm
Is shown. Further, as described above, the toe-down amount (δ) mm is a mark of a ball applied to the club face in advance after the shot by previously matching the position teeed up before the shot and the center position of the club face, It is a value obtained by measuring the off-center amount ratio (movement amount ratio) of the hit position, that is, as a toe down amount (δ) mm, for example, the minimum is SS, the small is S, the medium is M, the large is L, and the maximum is L.
L.

The following table shows the head speed Hs (m / Se
This is a conversion table of the toe down amount (δ) mm corresponding to c), which is used as a reference when purchasing a golf club. This conversion table is for golf robots (robot model name:
With My Shot Robo II (manufactured by Miyama Seisakusho), the No. 1 wood golf club (# 1: driver), the toe-down amount (δ) mm at the head speed Hs (34 m / Sec), the minimum (SS), and the minimum ( S), medium (M), large (L), and local maximum (LL).

[0032]

It is to be noted that the above conversion table is produced for each club number so that, for example, the head speed (HS)
M-34 measured the toe down amount (δact) with a standard golf club at a golf shop or the like, and when the toe down amount was 30 mm, the golf club A
The golf club of M-34 and δact 30 mm indicated on the shaft 2 may be selected and used.

However, even when it is desired to use a golf club with a slightly harder shaft (EI) _eq is large) or when the same golf club other than golf club A must be used suddenly during play, a different same golf club is used. M
-34, by using the same toe down amount (δact) of 30mm, the feeling of incongruity is small even when swinging, and the stance can be made to be the same, and the swing can always be achieved with the maximum flight distance and stable directionality. Can always be obtained.

Table 1 below shows golf clubs A, B, C, and D of the series-related golf club group in the above conversion table.
FIG. 4 shows variations in flight distance and directionality when the golf clubs are used, and shows golf clubs A, B, and
C and D and the golf clubs E and F of the comparative example are the results when the top amateur hits 50 times. The wood golf club used was a driver (# 1) and had a head speed Hs (34 m / Sec).

[0036]

[Table 1]

When the same player uses the club A, and then uses the club B, the club C, the club D, and the club E sequentially, the flight distance and the degree of directional variation are shown. As a result, the ratio of the tow-down amount to 90-
When the club set up to 110 was used, the variation was smaller than in the comparative example on the right (B, C, D). On the other hand, if the clubs E and F are used, the flight distance and the directionality will vary greatly.

As is apparent from the above conversion table and Table 1, in a group of golf clubs having the same head speed and different types in the series, the clubs having the same equivalent toe down amount of the golf clubs between the same numbers are selected and used. As a result, compared to the comparative example, the dispersion of the flight distance and the dispersion of the directionality are small, and the maximum flight distance and stable directionality can always be obtained.

FIGS. 2A to 2C show three iron golf clubs 13 of different types with the same club number (in this embodiment, iron golf club number # 5 is shown). # 5 (X), # 5 (Y), # 5
3 shows an iron golf club series showing (Z).

This iron golf club series also has a loft angle,
Three iron golf clubs # 5 (X), # 5 (Y), and # 5 (Z) having different types of center of gravity height, center of gravity depth, lie angle, face angle, head volume, total weight, and the like. But,
The toe down amount ratio of each golf club is set substantially constant.

As is apparent from Table 1 above, a golf club series comprising two or more golf clubs of different types (characteristics) having substantially the same head speed and the same club count, and having the same club count. By setting the toe-down amount of the golf club to be substantially constant, and selecting and using the club having the same toe-down amount ratio, compared to the comparative example, the directional variation is small, and even when swinging the golf club, The feeling of incongruity is small, and the swing can be made with the same stance, always the maximum flight distance,
A stable direction can be obtained. Further, it is preferable that the toe down amount ratio λ _ij is set to 0.9 to 1.1.

[0042]

As described above, according to the present invention, a plurality of types of golf clubs having substantially the same head speed and having the same number in a series of golf club groups constituting a series relationship have substantially the same toe down speed. Since it is a series related golf club group having a quantitative ratio, even when swinging two or more different types of golf clubs between the same club number, the feeling of discomfort is small, and it is possible to swing with the same stance. The maximum flight distance and stable directionality can always be obtained.

[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 three iron golf clubs of different types # 5 (X), # 5 (Y), # 5 (Z) 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] A golf club having a series relationship in which the same number of golf clubs in a plurality of types of golf club groups having substantially the same head speed and forming a series relationship have substantially the same toe down ratio. Club group. 2. The toe-down amount ratio of the same number of golf clubs in the plurality of types of golf club groups is 0.9 to 0.9.
2. The series-related golf club group according to claim 1, wherein the group is set 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.