JP3096254B2 - Golf club heads - 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 head group.

[0002]

2. Description of the Related Art Conventionally, in the same number of wood type golf club heads (wood type golf clubs), only the loft angle is made different (that is, with a loft variation), the shape, the size, and the head. There has been known a golf club head group in which a head can be selected from a plurality of identical models having substantially the same center of gravity and the like in accordance with the golfer's technique, head speed, and the like.

[0003]

However, in the golf club head group as described above, the amount of change in the height of the center of gravity on the face with respect to the amount of change in the loft angle within the same number is small. For example, as shown in FIG. 8, when the head a having a loft angle of 9 ° and the head b having a loft angle of 11 ° are compared, the position of the center of gravity g of the head is substantially the same, and the height h of the center of gravity on the face is h. The absolute value of the difference c between ₁ and h ₂ is about 1.4 mm,
As the loft angle increased by 1 °, the height of the center of gravity on the face only increased by about 0.7 mm. That is, the ratio of the increase in the height of the center of gravity on the face surface to the increase in the loft angle was small.

[0004] Therefore, even if the loft angle is increased by 1 ° to 2 °, the back spin of the hit ball does not increase so much. When a golfer with a slow head speed hits, the hit ball does not float up sufficiently and the flight distance is short. Was. Even if the loft angle was reduced by 1 ° to 2 °, the back spin did not decrease so much. When a golfer with a high head speed hit the ball, the hit ball was blown up and the flight distance was small.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a golf club head group capable of further increasing the flight distance in accordance with the golfer's head speed and technique. It is another object of the present invention to provide a golf club head group that can respond to various demands of golfers such as spin performance and trajectory.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, a golf club head group according to the present invention is a golf club head group comprising a plurality of wood type golf club heads of the same count having different loft angles. And the loft angle is 1 °
The position of the center of gravity of the head is set so that the height of the center of gravity on the face surface changes by 1 to 3 mm as it changes.

Further, in a golf club head group including a plurality of wood type golf club heads of the same number having different loft angles, as the loft angle increases by 1 °, the height of the center of gravity on the face surface becomes 1 to 1. The position of the center of gravity of the head is set so as to increase by 3 mm.

It is preferable that the height of the center of gravity of the head be increased with an increase in the loft angle. It is also desirable to increase the depth of the center of gravity of the head as the loft angle increases.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on the illustrated embodiments.

FIG. 1, FIG. 2 and FIG. 3 show an embodiment of a golf club head group according to the present invention. This golf club head group comprises a plurality of wood type golf clubs of the same count having different loft angles. The head 1 of the same model is provided with a so-called “loft variation”. 2 indicates a sole, 3 indicates a face surface, and 6 indicates a crown portion. Further, in FIG. 3, the golf club head 1a indicated by a solid line is a cross section taken along the line AA in FIG. 1, the loft angle is 9 °, and the golf club head 1b indicated by a dashed line.
Is a cross section taken along the line BB in FIG. 2 and has a loft angle of 11 °. Each of the heads 1a and 1b is a hollow head made of metal (metal head).

The face surfaces 3 of the heads 1a, 1b
Has a so-called "round", and is a curved surface slightly convex forward. Here, as shown in FIG. 4, when the head 1 is placed on a horizontal plane E, the loft angle is defined as an inclined surface D in contact with the center point P of the face surface 3 and the inclined surface D
Is defined as an angle θ formed with a vertical line F intersecting with.

The position of the center of gravity G of the head is set so that the height H of the center of gravity on the face surface changes by 1 to 3 mm as the loft angle changes by 1 °. Specifically, in FIGS. 1, 2 and 3, the position of the head center of gravity G is set such that the height H of the center of gravity on the face surface increases by 1 to 3 mm as the loft angle increases by 1 °. Here, the height H of the center of gravity on the face surface is defined as a height dimension of the leg 5 of the perpendicular line 4 lowered from the center G of the head to the face surface 3 from the sole 2.

Further, as the loft angle increases, the height N of the center of gravity of the head increases. The head 1 shown in FIG.
a, 1b, a head 1b having a loft angle of 11 °
Of the face surface on the center of gravity height H ₂ is, as the loft angle is 2~6mm increases than 9 ° head 1a face the center of gravity height H ₁ of the head height of center of gravity of N ₂ head 1b, head increasing by a predetermined distance J of the head height of the center of gravity N ₁ of 1a.

Specifically, as shown in FIG. 1 and FIG. 2, while the head shape in plan view is substantially the same, as shown in FIG. The height N of the center of gravity of the head is increased by increasing the height dimension of the region from the vicinity of the front end to the rear end. In other words, than the height K ₁ of the rear end of the crown portion 6 of the head 1a, the height K ₂ of the rear end of the crown portion 6 of the head 1b is increased. More specifically, the amount of increase in the height of the crown 6 and its surrounding wall is gradually increased from the vicinity of the front end to the rear end.

As a result, the ratio of the height H of the center of gravity on the face to the increase in the loft angle of the head 1 is increased as compared with the conventional golf club head group. That is, conventionally, as shown in FIG. 8, when the head a having a loft angle of 9 ° and the head b having a loft angle of 11 ° are compared, the position of the center of gravity g of the head is substantially the same. The difference c between the heights h ₂ and h ₁ was about 1.4 mm, and as the loft angle increased by 1 °, the height of the center of gravity on the face only increased by about 0.7 mm.

In contrast, according to the golf club head group of the present invention shown in FIGS. 1 to 3, as the loft angle increases by 1 °, the height H of the center of gravity on the face increases by 1 to 3 mm. Therefore, the amount of change in the backspin of the heads 1a and 1b having different loft angles increases. That is, the face surface 3
Considering the case where the golf ball is hit at the center point P of
The amount of increase in the backspin of the head 1b having the loft angle of 11 ° with respect to the backspin of the head 1a having the loft angle of 9 ° is larger than that of the conventional golf club head group. This is because the back spin increases in the head 1b because the loft angle is larger by 2 °, and in addition, the amount of increase in the height H of the center of gravity on the face of the head 1b 高 the height H of the center of gravity on the face H This is because the difference C─── between ₂ and H ₁ is as large as ₂ to 6 mm and the center of gravity is high, so that the backspin further increases due to the so-called “gear effect” or the like.

Therefore, according to the golf club head group, the ratio of the increase in the backspin to the increase in the loft angle increases. In other words, the ratio of the decrease in the backspin to the decrease in the loft angle increases. This allows
A head having an increased loft angle of 1 to 2 ° has a remarkably large backspin amount, which makes it easier for a hit ball to float, and is suitable for a golfer with a slow (low) head speed.
That is, if a golfer with a slow head speed is used, the hit ball is appropriately lifted and carry is increased, and as a result, the total flight distance including the carry and the run is increased.
Further, the head in which the loft angle is reduced by 1 to 2 ° has a small backspin amount, so that the head speed is high (high).
Suitable for golfers. That is, if a golfer with a high head speed is used, it is possible to prevent the hit ball from blowing up, so that the number of runs increases, and as a result, the total flight distance of the carry and the run increases. In addition, a hit ball which is strong against an attack (a head wind) can be obtained.

In this golf club head group,
The reason why the position of the center of gravity G of the head is set such that the height H of the center of gravity on the face surface increases by 1 to 3 mm as the loft angle increases by 1 ° is that the height H of the center of gravity on the face surface with respect to the increase of the loft angle by 1 °. When the increase of the loft angle is less than 1 mm, the backspin cannot be effectively increased or decreased to the extent that the loft angle is increased or decreased slightly (about 1 ° to 2 °) from the standard angle. This is because the total flight distance does not increase so much for both slow and fast golfers. When the height H of the center of gravity on the face surface with respect to the increase of the loft angle by 1 ° exceeds 3 mm, as a wood type golf club head of the same number,
This is because the structure and design cannot be unified.

In order to increase the height N of the center of gravity G of the head as the loft angle increases, the head 1
In addition to increasing the height of the region from the vicinity of the front end to the rear end of the crown portion 6 and its peripheral wall, for example,
It is also preferable to increase the height of the crown portion 6 and substantially the entire region of the surrounding wall. In that case, the height K of the rear end of the crown portion 6 of the head 1, the height L of the top portion, and the height M of the upper end of the face surface 3 increase.

Next, FIGS. 5, 6 and 7 show another embodiment, in which a head 1 forming a group of golf club heads is shown.
Comprises a head body 7 and a weight member 8 fixed to the sole 2 of the head body 7. Weight member 8
Is made of a material having a specific gravity greater than the specific gravity of the material of the head body 7. Specifically, the head body 7 is made of a titanium alloy having a specific gravity of 4.42, and the weight member 8 is made of tungsten having a specific gravity of 18.0.

Thus, as the loft angle increases, the depth T of the center of gravity of the head is increased, and as the loft angle increases by 1 °, the height H of the center of gravity on the face surface increases by 1 to 3 mm. The position of the center of gravity G of the head is set. That is, while the weight member 8 is fitted to the sole 2 of the head body 7,
The weight member 8 is moved rearward as the loft angle increases. Further, the height N of the center of gravity G of the head is made constant.

Specifically, as shown in FIG. 6, a recess is provided near the front end of the sole 2 of the head 1c having a small loft angle, and a weight member 8 is fitted and fixed in the recess.
Further, as shown in FIG. 7, a head 1d having a large loft angle
A recess is provided near the rear end of the sole 2, and a weight member 8 is fitted and fixed in the recess. Then, the sole 2 and the weight member 8 are flush with each other.

With the above configuration, the ratio of the height H of the center of gravity on the face to the increase in the loft angle can be increased without changing the size and shape of the head 1 at all. Therefore, the ratio of the increase in the backspin to the increase in the loft angle increases. In some cases, the head body 7 and the weight member 8 may be made of the same material.

The present invention can be modified in design other than the above-described embodiment. For example, it is preferable to increase both the height N of the center of gravity of the head and the depth T of the center of gravity of the head as the loft angle increases. . Further, the position of the center of gravity G of the head may be changed by changing the thickness distribution of the peripheral wall of the hollow head 1. Hollow (metal head) as head 1
However, the head may be a solid head such as a wooden head.

The type of the loft angle of the wood type golf club head 1 constituting the golf club head group of the present invention is preferably about 3 to 10 in addition to two. Further, the loft angle is not limited to an integer such as 9 °, 10 °, 11 °, and may include a decimal number such as 9.5 °, 10 °, 10.5 °.

Also, as the loft angle increases by 1 °,
In some cases, the position of the center of gravity G of the head may be set so that the height H of the center of gravity on the face decreases by 1 to 3 mm. In this case, even if the loft angle increases, the amount of increase in the backspin is smaller than that in the conventional golf club head group, so that a hit ball with a low trajectory and a small backspin (hardly affected by wind) can be obtained with a high trajectory. .

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a loft corresponding to a conventional golf club head group consisting of four types of first woods (metal heads) having loft angles (loft variations) of 9 °, 10 °, 11 °, and 12 °. The golf club head group of Example 1 was manufactured by increasing the height of the center of gravity of the head as the angle increased. The head shape corresponded to the head shown in FIGS.
Table 1 below shows the height of the center of gravity on the face of the head and the amount of increase in the height of the center of gravity on the face with respect to the head having a loft angle smaller by 1 °.

[0028]

[Table 1]

As is apparent from Table 1, in the first embodiment, the height of the center of gravity on the face surface increases by 1 mm or more as the loft angle increases by 1 ° over all the heads. On the other hand, in the conventional example, the amount of increase in the height of the center of gravity on the face surface is less than 1 mm over the entire head.

Next, apart from Example 1 and the conventional example, a metal head (loft angle) of No. 1 wood as a reference example for comparison was used.
12 °). The head having a loft angle of 10 ° in the first embodiment and the conventional example and the head of the reference example have a club length of 45.
A golf club was manufactured by mounting the same shaft so as to be inches, and an actual hitting test was performed with a swing robot. The actual hit was performed for each club by 5 hits. The results are shown in Table 2 below.

[0031]

[Table 2]

From the above Table 2, it can be seen that the height of the center of gravity on the face surface is 0.90 mm lower, the backspin is smaller by 616 rpm, the carry is 3.6 yards larger, and the total flight distance is 7.3 yards compared to the conventional example. large. In addition, the height of the center of gravity on the face surface in Example 1 is 2.19 mm lower than the reference example,
Back spin is 1682r.pm smaller, carry is 7.0 yards larger, and total flight distance is 12.4 yards larger. The head speed at the time of impact is 45.0 m / s, which is higher than the average head speed of general amateur golfers.
From this, it can be said that the head of the golf club head group of Example 1 having a loft angle of 10 ° is most suitable for a person having a relatively high head speed, and has higher flight distance performance than the conventional product.

Next, the depth of the center of gravity of the head was increased with an increase in the loft angle, and a golf club head group of Example 2 was manufactured. The loft angle of the head that forms the head group is 10 degrees
12 °, and the head shape and structure corresponded to the heads shown in FIGS. Table 3 below shows the depth of the center of gravity of the head, the height of the center of gravity of the head, and the height of the center of gravity on the face surface.

[0034]

[Table 3]

As apparent from Table 3, the loft angle is 10
The head with a loft angle of 12 ° increases the depth of the center of gravity of the head by 2.8 mm and the height of the center of gravity on the face by 2.7 mm is higher than the head with a loft angle of 12 °. The height of the center of gravity of the head is the same. From this, it can be said that the height of the center of gravity on the face surface can be effectively increased by increasing the depth of the center of gravity of the head.

[0036]

The present invention has the following remarkable effects by the above-mentioned structure.

According to the golf club head group of the first aspect, the ratio of the change in the backspin to the change in the loft angle can be significantly increased. Therefore, each golfer can select a head having more excellent flight distance performance in accordance with the difference in head speed between golfers. Also, in the case of fairway woods, golfers who want excellent backspin performance to ensure that the hit ball stops on the green, golfers who want a small backspin and a hit ball that is less likely to be affected by the wind, etc. Can respond to various requests.

According to the golf club head group of the second aspect, the head in which the loft angle is larger than the standard angle of the iron count has a large increase in the backspin, so that the head is suitable for a golfer with a slow head speed. The hit ball rises moderately and the flight distance increases. Also, a head having a loft angle smaller than the standard angle has a large amount of reduction in backspin, so that a hit ball can be prevented from blowing up in response to a golfer with a high head speed, and the flight distance increases. In addition, a hit ball that is strong against an attack (a head wind) can be obtained. Therefore, it is possible to select a head having more excellent flight distance performance by widely responding to the difference in head speed between golfers. Particularly, it is suitable for the first wood (driver).

According to the golf club head group of the third aspect, the height H of the center of gravity on the face surface can be increased as the loft angle increases without changing the depth T of the center of gravity of the head. Therefore, even if the loft angles are different, the directionality of the hit ball and the width of the sweet area can be made substantially the same.

According to the golf club head group of the fourth aspect, for example, the weight member 8 is fixed to the sole 2,
By adjusting the position of the weight member 8 back and forth, the head center-of-gravity depth T can be easily changed, so that a structure for increasing the height H of the center of gravity on the face surface with an increase in the loft angle is simplified. And even if the loft angle is different,
Since the head shape and size are hardly changed, it is possible to eliminate an unnatural appearance.

[Brief description of the drawings]

FIG. 1 is a plan view showing one head constituting a golf club head group according to the present invention.

FIG. 2 is a plan view showing another head constituting a golf club head group.

FIG. 3 is an explanatory diagram of two heads forming a golf club head group.

FIG. 4 is an explanatory diagram of a loft angle.

FIG. 5 is an explanatory diagram of another embodiment.

FIG. 6 is a bottom view of one head according to another embodiment.

FIG. 7 is a bottom view of another head according to another embodiment.

FIG. 8 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Wood type golf club head G Head center of gravity H Height of center of gravity on face N Head height of center of gravity T Head center of gravity depth

Continuation of the front page (56) References JP-A-58-41575 (JP, A) JP-A-8-24376 (JP, A) JP-A-61-82662 (JP, U) Japanese Translation of PCT Publication No. 6-500040 (JP) , A) (58) Field surveyed (Int. Cl. ⁷ , DB name) A63B 53/00-53/16

Claims (4)

(57) [Claims] 1. In a golf club head group consisting of a plurality of wood type golf club heads 1 having the same number and having different loft angles, the height H of the center of gravity on the face surface increases as the loft angle changes by 1 °. A golf club head group, wherein the position of the center of gravity G of the head is set so that the distance varies by 1 to 3 mm. 2. In a golf club head group consisting of a plurality of wood-type golf club heads 1 having the same number and having different loft angles, as the loft angle increases by 1 °, the height of the center of gravity H on the face surface increases. A golf club head group characterized in that the position of the center of gravity G of the head is set so that is increased by 1 to 3 mm. 3. The golf club head group according to claim 2, wherein the height N of the center of gravity of the head is increased with an increase in the loft angle. 4. The golf club head group according to claim 2, wherein the depth T of the center of gravity of the head is increased with an increase in the loft angle.