JP2523438B2 - Golf club set - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club set including a plurality of golf clubs having different loft angles, and more particularly to a golf club set in which a shaft and a head of a club having a small loft angle are improved.

[0002]

2. Description of the Related Art A golf club set is composed of a plurality of golf clubs having different loft angles which are angles from a vertical plane of a club face. The clubs are generally distinguished by the count, for example, 5 iron and 9 iron, depending on the size of the loft angle. Clubs with small loft angles are mainly used for long range shots, and iron clubs with large loft angles, pitching wedges and sand wedges are mainly used for short range shots.

In such a golf club set, the smaller the club, the longer the shaft,
In addition, the loft angle of the club face is made smaller so that the trajectory is lowered and the flight distance is extended. On the other hand, the larger the club, the shorter the shaft and the larger the loft angle, the higher the trajectory and the shorter the flight distance.

As an example of such a golf club set, an iron club whose shaft is made of steel or the like is adopted, and as shown in FIG. 4, as the length changes from long iron 1 to short iron and sand wedge, the shaft is 0.5 inch at a time. And the shaft weight (curve S) is reduced in proportion to this, while the head weight (curve H) is reduced to 6
Iron club sets that are heavier by 7 g are known.

In this type of iron club set, the shorter the iron is, the heavier the head is and the longer the iron is, the lighter the head is set. Was left with various problems.

That is, in the case of a long iron having a small loft angle, the shaft weight becomes heavier, but the head weight becomes lighter, so that there is a problem that the club is hard to swing and a miss shot is likely to occur.

Therefore, in view of this problem, in all the golf clubs constituting the golf club set, the weight of the shaft of each club is made heavier as the shaft is shorter, and the hardness of the shaft is harder as the shaft is shorter. Then
It has been proposed that by making the hardness of the shaft softer as the shaft length becomes longer, it is easier to raise the ball with the long iron, and with the short iron, a shot with a stable directionality is performed (JP-A-2). −
No. 191473).

Further, for all the golf clubs constituting the golf club set, the outer diameter of the shaft is gradually increased from the club with the smallest count to the club with the largest count (JP-A-2-224679), or the shaft. It has been proposed that the inner diameter of the club be gradually reduced (Japanese Patent Laid-Open No. 224770) to reduce the weight of a club having a small count (loft angle) to increase the head speed and the flight distance.

[0009]

However, the former and latter two golf club sets have a tendency to be slightly swingable because the total weight of each long iron having a small loft angle is reduced. The weight of the shaft is simply and proportionally reduced for all the clubs constituting the set to gradually reduce the weight, and the weight of the head is hardly considered. Therefore, especially for beginner and intermediate so-called average golfers, for example, FIG.
As shown in (4), in the case of a long iron shot with a small loft angle, the flight distance did not increase so much, and a flight distance peaking phenomenon occurred around the 5th iron (loft 28 °). In addition, there is a problem that slices and miss shots are likely to occur.

The present invention has been made in view of the above problems, and in particular, it facilitates swinging of a long club having a small loft, increases the head speed to further increase the flight distance, and the head easily returns, resulting in slicing or miss. An object is to provide a golf club set that can reduce shots.

[0011]

In order to achieve the above object, the golf set according to the present invention comprises a plurality of golf clubs having different loft angles, from a golf club having a small loft angle to a golf club having a large loft angle. In the golf club set in which the weight of the shaft is reduced by a certain amount as the order becomes, and the weight of the head is increased by a certain amount, the weight of each shaft of the golf clubs with a loft angle of a certain value or less is fixed. It is characterized in that the weight is further reduced by the weight reduction by each weight, while the weight of the head is further increased by the weight increase by the constant weight.

The golf club having a loft angle below a certain level is
Preferably, for a loft angle of 35 degrees or less, the weight of each shaft is further reduced as described above, while the weight of the head is further increased, and more preferably, the loft angle is 15 to 30 degrees. For golf clubs in the range, the weight of each shaft is further reduced as described above, while the weight of the head is further increased.

[0013]

With the above structure, the weight of each shaft is made particularly light and the weight of the head is made particularly heavy for a golf club having a loft angle of a certain value or less among the plurality of golf clubs constituting the golf club set. In these long clubs with a small loft angle, the relative weight of the shaft is reduced, so the head speed during a swing is increased, and it is easier to swing than a long club with a heavy shaft. Also, since the head weight of the long club has been increased,
The trajectory of the shot is stabilized, the repulsive force of the head is improved,
The head returns faster.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. 1 is a front view in which each golf club of the golf club set is arranged in a so-called turn procedure from a small loft angle to a large loft angle, and FIG. 2 is a hosel (head root portion) of a shaft in each golf club of FIG. 2 is a cross-sectional view taken along the line II-II at a position from the length L to. In this embodiment, the case of an iron club set in which the shaft and the head are made of iron will be described.

In the iron club of this embodiment, 1 is a 1-iron, 2 is a 2-iron, and 3 is a 3 from the left side of FIG.
Number 4 iron, 4 number 4 iron, 5 number 5 iron, 6
Is a 6 iron, 7 is a 7 iron, 8 is an 8 iron, 9 is a 9 iron, and 10 is a pitching wedge P.
W and 11 are sand wedge SW. And
The loft angle of each club is 16 ° for 1 iron 1, 2 ° for 2 iron, 18 ° for 3 iron, 21 ° for 3 iron, 24 ° for 4 iron, 4 ° for 5 iron, 28 ° for 5 iron, 6 iron. 6 is 32 °, 7 iron 7 is 36 °, 8 iron 8 is 40 °, 9 iron 9 is 44 °, pitching wedge PW is 49 °, and sand wedge SW is 55 °.

Clubs 1-1 having these loft angles
1 is each shaft 1a, 2a, 3a, 4a, 5
A, 6a, 7a, 8a, 9a, 10a, 11a are hollow, and for example, a reinforcing fiber sheet is wound around the mandrel (center rod) in multiple layers, and a thermosetting plastic is filled and cured to manufacture it.

As the reinforcing sheet, aramid fiber,
A fiber reinforced plastic shaft 1 made of carbon fiber, boron fiber, or the like is produced by a conventionally known prepreg sheet winding manufacturing method or filament winding manufacturing method.
a to 11a are manufactured.

The shafts 1a to 11a have a total length shortened by, for example, about 0.5 inch as the count (loft angle) increases, and the weight is gradually reduced to be approximately proportional to the weight. As for the shafts 1a, 2a, 3a, 4a, 5a, which have a particularly small loft angle,
Instead of such a uniform weight reduction, the reduction rate is further reduced to further reduce the weight.

As a method of reducing the weight of the shaft, in this embodiment, a method of changing the weight depending on the size of the wall thickness t of the shaft is adopted. That is, by increasing the number of windings of the reinforcing fiber sheet from a club having a smaller loft angle to a club having a larger loft angle, the wall thickness is increased, and as shown in FIG.
Although the weight of a (curve S) is gradually increased,
Especially the loft angle is 15 to 30. The following shafts 1a, 2
a, 3a, 4a, 5a, the other shafts 6a ~
Compared to 11a, the number of times the steel sheet is wound is significantly reduced, and the reduction rate is further reduced to further reduce the weight.

Further, the golf club heads 1b, 2
b, 3b, 4b, 5b, 6b, 7b, 8b, 9b, 10
As for b and 11b, the weight of the heads 1b to 11b (curve H) is gradually increased by increasing the weight by about 7 g, for example, from a club with a small loft to a club with a large loft, but especially the heads 1b to 5b. about,
Instead of such a uniform weight increase, the rate of increase is further reduced to achieve further weight reduction.

As a method of increasing the weight of the head, for example, the material of the head may be adjusted by selectively combining the materials forming the head. in this case,
From the viewpoint of effective weight reduction of head,
It is preferable to select beryllium, stainless steel (iron), titanium, and aluminum in this order.

As a result, particularly in the first long iron 1 requiring the longest flight distance, the weight of the shaft 1a is thoroughly reduced, while the weight of the head 1b is increased. Speed increases, repulsive force increases, and it becomes possible to extend flight distance.

FIG. 5 shows comparative results of experiments by average golfers using the golf club of the present invention and the conventional golf club. The lengths of the shafts of both clubs are substantially equal to each other.

As is apparent from the figure, in Conventional Example B,
In the range of the sand wedge SW to the 6th iron 6, the flight distance almost smoothly extends in a substantially straight line, but in the so-called long iron of 5th iron 5th to 1st iron 1, which has a smaller loft angle, the flight distance is It stayed at about 150m and stopped growing, and it reached the ceiling.

On the other hand, in this example A, the fifth iron 5
However, the flight distance was longer than that of the sixth iron 6 and exceeded that of the conventional example B, and when the second iron 2 was changed to the first iron 1, the flight distance was steadily increased and reached about 180 m.

This is a shaft 1 especially for long irons.
The result is that a to 5a are made lighter and heads 1b to 5b are made heavier, which makes it easier for an average golfer to swing, which enables a well-balanced shot to extend the flight distance and slice or miss. It is also possible to reduce shots.

In the above embodiment, a method of changing the weight by changing the thickness of the shaft is adopted as a method of reducing the weight of the shaft. However, a method of changing the diameter of the shaft may be used instead.

Alternatively, the shaft material may be adjusted by a selective combination of the materials used, mainly carbon fibers. In this case, from the viewpoint of effectively reducing the weight of the shaft, it is preferable to select aramid fibers, carbon fibers, and boron fibers in this order as the materials to be used.

In the above embodiment, the loft angle is 15 °.
5 iron club shafts 1 ~ 30 ° or less
a, 2a, 3a, 4a, 5a, another shaft 6
The weight reduction rate is made smaller than that of a to 11a to further reduce the weight, and the weight increase rate of the heads 1b to 5b is further reduced to further increase the weight, but the loft angle is 35 degrees or less. With regard to the six golf clubs, the shafts 1a, 2a, 3a, 4a, 5a, 6a are further reduced in weight, and the heads 1b, 2b, 3b, 4 are
The weights of b, 5b and 6b may be further increased.

In the above embodiment, the case of applying to an iron club has been described, but it goes without saying that it can also be applied to a wood club or a metal club.

[0031]

The present invention reduces the weight of the shaft for several long clubs having a small loft angle,
Because the weight of the head is heavy, it is easy to swing, the head speed at the time of shot is increased, and the flight distance of the ball can be greatly extended. In addition, since the head weight of the long club is large, the repulsive force is improved, the return of the head during swing is improved, the trajectory of the shot is stabilized,
It has excellent effects such as reducing slices and miss shots.

[Brief description of drawings]

FIG. 1 is a front view in which golf clubs of a golf club set according to an embodiment of the present invention are arranged in a turn sequence.

2 is a cross-sectional view of the shaft of each golf club shown in FIG. 1 at a position of a length L from a hosel (head root).

FIG. 3 is a graph showing the weight of the shaft and head of the golf club set for each count and loft angle.

FIG. 4 is a graph showing weights of a shaft and a head of a conventional golf club set for each count and loft angle.

FIG. 5 is a graph showing comparison results of flight distances of golf clubs of the present invention and a conventional example.

FIG. 6 is a graph showing the flight distance of each club when a conventional golf club set is used.

[Explanation of symbols]

 1-9, PW, SW Golf club 1a-11a Shaft 1b-11b Head

Claims (3)

(57) [Claims] 1. The weight of a shaft is reduced by a constant weight while the weight of a head is reduced by a certain amount as a golf club having a plurality of loft angles and a golf club having a smaller loft angle is changed to a golf club having a larger loft angle. In a golf club set that is made heavier by weight, for golf clubs having a loft angle less than or equal to a certain value among the golf clubs, the weight of each shaft is further lightened to exceed the weight reduction of the constant weight, while the weight of the head is reduced. A golf club set, wherein the golf club set is heavier than the constant weight increase. 2. The golf club set according to claim 1, wherein a loft angle of the golf club having a predetermined loft angle or less is 35 degrees or less. 3. The golf club set according to claim 1, wherein a loft angle of the golf club having a loft angle equal to or less than the predetermined loft angle is in a range of 15 degrees to 30 degrees.