JP2003070938A - Golf club set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a set of golf clubs which enable a player to easily hit a shot even on the rough and enable even a beginner to easily swing the golf clubs. SOLUTION: This golf club set varies in shaft numbers but is approximately constant in head volume, head height and in gravity-center height. The moment of inertia around a gravity-center axis XG is greater as the shaft number is higher.

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 club lengths. More specifically, as the club length gradually decreases, the loft angle of the head gradually increases. It's about club sets.

[0002]

2. Description of the Related Art In a golf club set including a plurality of golf clubs having different club lengths, the loft of the head is increased as the club length is shortened. Traditionally, the head volume has been made smaller as the length becomes shorter.

[0003]

However, looking at the club usage status of general golfers, the shorter the club length is, the more frequently it is used in the rough (the area where grass is not cut short). If you try to hit a ball that is riding on rough grass and the golf club head is small, the golf head will pass under the ball, resulting in a so-called dull drop where the ball does not fly. In some cases, the ball hits a corner, which is an intersection of the upper end of the face part and the crown part, and the ball rises so high that it becomes a so-called tempura with no flight distance.

An object of the present invention is to provide a golf club set which is not limited to a traditional shape and which is made of a golf club for preventing the above phenomenon from occurring easily.

[0005]

A golf club set according to the present invention is a golf club set comprising a plurality of golf clubs having different club lengths, each golf club having a hollow portion. A golf club set in which the loft angle of the head of each golf club gradually increases as the club length gradually decreases.

The golf club set according to claim 1 is characterized in that the volume of the head of each golf club is substantially constant even if the loft angle of the head of the golf club increases.

A golf club set according to a second aspect of the present invention is characterized in that the head height of the head of each golf club is substantially constant even if the loft angle of the head of the golf club increases.

In the golf club set according to claims 1 and 2, when hitting a ball on rough grass, the relative relationship between the face of the head of the golf club and the ball is different for each golf club. The shots are almost the same, so you can shoot with peace of mind.

According to the present invention, by setting the heights of the centers of gravity of the heads of the golf clubs to be substantially the same, it is possible to stably obtain a launch angle corresponding to the loft angle.

In the present invention, it is preferable that the head be constructed so that as the loft angle of the golf club head increases, the moment of inertia IX about the center of gravity axis XG passing through the center of gravity of the golf club head increases. As a result, the rate of miss shots when shooting from the rough can be reduced.

The golf club of the present invention is preferably a wood type golf club. Since the head of this wood type golf club has a deeper center of gravity than the head of an iron type golf club, it is preferable to make the face surface convexly curved. The head of this wood type golf club is generally larger in maximum head depth than in maximum height excluding the hosel portion.

In the present invention, the club length is defined as "the total length of the club" defined in the Golf Rules (Japan Golf Association, January 1, 2001 edition), that is, as shown in FIG. It is the length measured along the axis of the shaft (or overtime) up to the sole.

The maximum head depth of the present invention is determined by placing the club head at a normal address position in the Golf Rules and horizontally measuring the distance between the front and back ends of the vertical projection plane of the club head. Length ', ie Figure 3
Is A.

The loft angle of the present invention is a tangent line at the center of the face surface of the horizontal projection surface to the side of the club head at the normal address position (center of the face surface in the vertical and horizontal directions). And the vertical line.

As shown in FIG. 2 (a), the height of the center of gravity of the head means that the club head is laid on a horizontal plane and that the gap between the horizontal plane and the toe side is the same as the gap between the horizontal plane and the heel side. HG from the horizontal plane to the center of gravity G when the state is set to the following (hereinafter referred to as the standard sole state)
R. The maximum head height excluding the hosel portion is the distance from the horizontal plane when the club head is placed on the horizontal plane in the standard sole state to the highest portion of the crown portion.

As shown in FIG. 2 (b), the center of gravity axis XG passing through the center of gravity of the head means that the golf club head is in a standard sole state and is horizontal on a horizontal plane passing through the center of gravity G in a state in which the golf club head is laid on a horizontal plane. It is a direction line. The center-of-gravity axis XG is a line parallel to the horizontal tangent line of the center point of the face surface (so-called face angle 0 °).

[0017]

DETAILED DESCRIPTION OF THE INVENTION Embodiments will be described below with reference to the drawings. 1 is a front view showing a golf club of a golf club set according to an embodiment, FIG. 2 (a) is a left side view of a head of the golf club of FIG. 1, and FIG. 2 (b) is a front view of the head. . FIG. 3 is an explanatory diagram of the definition of the dimensions of the head, and FIG. 4 is an explanatory diagram of the definition of the dimensions of the golf club.

As shown in FIG. 1, the golf club 1 has a head 1
0, a shaft 20 mounted on the head 10, and a grip 21 mounted on the shaft 20.

The head 10 has a face 11 serving as a ball striking surface.
On the front. The hosel part 1 is on the heel side of the head 10.
2 is integrally provided, and the lower end of the shaft 20 is inserted into the hosel portion 12 and fixed by an adhesive.

In the golf club set of the present invention, the club length gradually decreases as the count increases, and the loft angle of the golf club head gradually increases as the count increases. Is designed like.

The golf club head used in the present invention has a hollow portion. The golf club head having the hollow portion can be easily designed such as the size of the head and the position of the center of gravity. Suitable head materials are aluminum alloys, titanium alloys, copper alloys such as beryllium copper, and stainless steel. A fiber reinforced resin or the like can also be used. When the head material is a low specific gravity material, it is easy to design the center of gravity of the head by disposing weight members.

The present invention is suitable for application to a set of golf clubs in which the maximum depth of the head is larger than the maximum height of the head excluding the hosel portion. This type of golf club is generally called a wood type golf club, and includes drivers, brassies, spoons, buffies,
Examples include 1st to 5th woods commonly referred to as creeks, or 6th and subsequent woods. However, golf clubs of this type also exist in some of the golf clubs called utility golf clubs that have been commercially available in recent years. In the wood type golf club, the larger the count, the smaller the size of the head, especially the face surface, so that it is difficult for a beginner to hit the ball correctly. The present invention solves this problem.

The head of the wood type golf club has a deeper center of gravity than the head of the iron type golf club. That is, the distance between the center of gravity and the face surface is large. Therefore, in the present invention, the face surface is preferably a round surface (curved surface) that is convex outward (forward). The round of the face surface is generally called the roll in the vertical direction and the bulge in the horizontal direction. In the present invention, the radius of curvature of this round is 8 to 40 inches (20.
32 to 101.6 cm) is desirable.

Even if the loft angle of this golf club becomes large, the volume of the head is hardly changed, so that a beginner can swing at the same rhythm in the golf club set with peace of mind, and it is stable. You can get the ball muscle. The head volume being substantially constant means that the heads of all golf clubs are within ± 5% of the average value (reference value), preferably ± 5%, based on the average value of the golf club head volumes forming the set of golf clubs.
It means having a volume within 3%.

When the present invention is applied to a fairway type golf club set (a set of fairway type golf clubs having a count of 3 (spoon) or more), the head volume of the golf club is 100 to 230 cc, particularly 120 to 200 c.
It is preferably c. Further, in this case, the loft angle is preferably 14 ° or more, and particularly preferably 15 to 30 °. Loft angle is 1
This is because if it is 4 ° or more, even a general golfer can easily launch a ball on the ground.

In the present invention, it is preferable to decrease the sole width as the loft angle increases. This is to reduce the resistance to the grass and make it easier to swing out.

In the present invention, even if the loft angle of the golf club becomes large, the height of the head excluding the hosel portion is made substantially constant, so that the possibility of a miss shot when hitting a ball on rough grass is increased. Can be lowered.

The head height is 30 to 42 mm, especially 32.
-40 mm, especially 34-38 mm is preferred. If the head height is less than 30 mm, it becomes difficult to hit the ball on the face surface, and if it exceeds 42 mm, it becomes difficult to shot from the fairway.

In the present invention, it is preferable that the maximum depth of the head of each golf club be substantially constant. By doing so, the user does not feel the difference in the count, and it is easy for a beginner to use. The maximum depth of this head is 6
0 to 100 mm, especially 70 to 85 mm is preferable. That the maximum depth of each head is substantially constant means that the maximum depth of any of the heads is within ± 5%, preferably within ± 3% of the average value of the maximum depth of the heads of the golf clubs.
If the maximum depth dimension is more than 100 mm, the resistance to the grass becomes large and swinging is poor, and if it is less than 60 mm, the head inertia moment IX around the center of gravity axis XG.
Becomes smaller, and the vertical sweet area becomes smaller.

Generally, when hitting a rough ball, a golf club having a loft angle larger as the ball sinks deeper into the rough is often used. As the ball sinks deeper into the rough, the position where the ball hits the face surface is more likely to vary in the vertical direction.

Therefore, in the present invention, a golf club having a larger loft angle, which is more frequently used in deep rough,
It is preferable to increase the inertia moment IX of the head around the center of gravity axis XG.

Generally, when the club length is shortened, the weight of the golf club head is increased in order to make the swing balance uniform. Normally, the weight is adjusted by the wall thickness of the head and the foam material put inside the hollow portion of the golf club head, but in the present invention, the weight member is attached to the sole portion by welding or press fitting, and the weight member is attached. It is preferable to adjust the moment of inertia by adjusting the weight of. As the weight member, tungsten having a specific gravity of 10 or more, a tungsten alloy, or the like is suitable.

In the golf club set of the present invention, it is preferable that the heights of the centers of gravity of the heads of the golf clubs are made equal. This makes it possible to stably perform a shot with a launch angle according to the loft angle. That the heights of the centers of gravity are equal means that the heights of the centers of gravity of the golf clubs are within ± 5% with respect to the average value of the heights of the centers of gravity of the golf clubs, preferably ±.
It is within 3%.

[0034]

EXAMPLES Examples and comparative examples will be described below.

Example 1 A three-piece golf club set made of No. 3, No. 5, and No. 7 woods was manufactured. The head of each golf club was manufactured by the lost wax method of stainless steel, and the center of gravity was adjusted using a tungsten-nickel alloy (specific gravity 14). The volume of the head of each golf club was fixed at about 130 cc, the maximum height other than the hosel portion was set at about 37 mm, the center of gravity height was set at about 15.3 mm, and the maximum head depth was set at about 76 mm. . The moment of inertia IX around the center of gravity axis was also constant at about 11.3 g · mm · sec ² .

The exact values of the above data and other specifications of each golf club are shown in Table 1.

Comparative Example 1 A golf club made of No. 3, 5, and 7 woods having the specifications shown in Table 1 in which the head volume, the maximum head height, the height of the center of gravity, and the maximum head depth were all varied depending on the count. The set was manufactured similarly.

[0038]

[Table 1]

When each golf club was used to hit a ball that was roughly sunk, a ball that was riding on rough grass, and a ball that was on a fairway, the golf clubs of the golf club set of the present invention repeatedly fired nice shots from the rough. It was easy, but the golf club of the comparative example had very many miss shots from the rough. In particular, in the case of a ball that floated roughly, it was easy to remove dharma or tempura in the comparative example.

[0040]

As described above, according to the present invention, there is provided a golf club set which is easy to shot even from a rough and is easy for beginners to handle.

[Brief description of drawings]

FIG. 1 is a front view showing a golf club of a golf club set according to an embodiment.

2 (a) is a left side view of the head of the golf club of FIG. 1, and FIG. 2 (b) is a front view of the head.

FIG. 3 is an explanatory diagram of definition of head dimensions.

FIG. 4 is an explanatory diagram for defining the dimensions of a golf club.

[Explanation of symbols]

10 golf clubs 11 face 12 Hosel part 13 Crown 20 shaft 21 grip

Claims (5)

[Claims] 1. A golf club set comprising a plurality of golf clubs having different club lengths, wherein the head of each golf club has a hollow portion, and each golf club is gradually shortened. In a golf club set in which the loft angle of the head is gradually increased, the head volume of each golf club is substantially constant even if the loft angle of the golf club head is increased. 2. A golf club set comprising a plurality of golf clubs having different club lengths, wherein the head of each golf club has a hollow portion, and each golf club has a progressively shorter club length. In a golf club set in which the loft angle of the head is gradually increased, the head height of each golf club is substantially constant even if the loft angle of the golf club head is increased. 3. The golf club according to claim 1, wherein as the loft angle of the golf club head increases, the moment of inertia IX about the center of gravity axis XG passing through the center of gravity of the golf club head increases. set. 4. A golf club set according to claim 1, wherein the heights of the centers of gravity of the golf clubs are substantially the same. 5. The golf club according to claim 1, wherein each golf club has a rounded convex shape on the face surface of the head, and the roundness is greater than the maximum head height excluding the hosel portion. A golf club set characterized by a larger maximum head depth.