JP2001340501A - Golf club head, and golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club head of a low center of gravity which is less likely to receive resistance of the grass in spite of a loft angle of 27 deg. or less. SOLUTION: This is a golf club head of metal suitable for an iron or a utility club comprising a first sole part S1 positioned on the face side of the golf club head to get in contact with the ground, and a second sole part S2 positioned on the back side of it for deepening the center of gravity in which a sole width W1 of the first sole part S1 is larger than a sole width W2 of the second sole part S2. A golf club provided with this head is also provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal golf club head having an improved sole shape, and a golf club provided with the head.

[0002]

2. Description of the Related Art In conventional metal golf club heads, the width of a sole is often determined according to the size of the head. For example, in an iron club,
Since the length becomes shorter as the count becomes larger, the sole width is designed so as to increase the weight of the golf club head as the count becomes larger in order to make the swing balance uniform.

[0003]

Generally, in a golf club head having a small loft angle called a long iron, the volume of the head is reduced in order to set the same swing balance as a short iron, and the sole width is also small. . For this reason, there has been a problem that the center of gravity of the head is increased and the ball is difficult to lift.

In view of this problem, in recent years, by attaching a metal golf club head having a hollow portion, which is a golf club head intermediate between wood and iron, a so-called utility club head, the sole width is increased as compared with iron. Utility clubs with a low center of gravity have been developed.

However, in the above-mentioned utility club, since the sole width of the head is large, when hitting a rough golf ball with a long turf, the wide sole portion is greatly affected by the resistance of the turf, making it difficult to hit. There is.

The present invention solves such problems of the conventional long irons and utility clubs. Even if the golf club head has a loft angle of 27 ° or less, the golf club has a low center of gravity and is not easily affected by turf resistance. Head and
It is an object to provide a golf club having such a head.

[0007]

SUMMARY OF THE INVENTION A golf club head according to the present invention is a metal golf club head having a first sole having a surface in contact with the ground located on the face side as a sole portion on the bottom surface of the golf club head. and part _{S 1,}
Located on the back side, the first has a second and a sole portion S ₂ formed on the upper than the sole part, the sole width W ₁ of the first sole portion S ₁ in the face center is the second sole part it is characterized in that greater than width sole W ₂ of S _2.

[0008] By providing such a second sole portion S _2, expanding the sole width, it is possible to deepen the centroid,
Even if you hit the ball out of the sweet spot, the flight distance and direction of the ball will be stable. Also, this second
Since the sole portion S ₂ is located in the first upper-level than the sole portion S _1, less subject to resistance of the turf.

According to the present invention, particularly in a so-called long iron having a loft angle of 27 ° or less or a utility club having a head body and a hollow portion, the center of gravity is lowered without increasing the resistance of the turf, and a good hitting function is achieved. Can be obtained.

[0010] A golf club of the present invention is provided with such a golf club head of the present invention.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the golf club head of the present invention will be described below in detail with reference to the drawings.

1 to 4 show an iron head according to an embodiment of the present invention. FIG. 1 is a front view, and FIG.
3 is a sectional view taken along the line II-II (face center position), FIG. 3 is a bottom view, and FIG. 4 is an enlarged view of the sole portion of FIG. FIG. 5 is a cross-sectional view (cross-sectional view along the face center position) showing the utility club head according to the embodiment of the present invention.

As shown in FIGS. 1 to 5, the sole portions S of the golf club heads 1 and 2 are located on the face portion F side, and the ground lines G. First and sole portion S ₁ in contact L, and located in the first back-side of the sole portion S _1, a ground line G. A second sole portion S ₂ which are not in contact L, and is composed of a chamfer M, first sole portion S ₁ of the sole width (hereinafter sometimes referred to as "first sole width".) W ₁ second sole Part S ₂
(Sometimes hereinafter referred to as "the second width sole.") Of the sole width greater than W _2.

[0014] The first sole portion _{S 1} is a ground line G. L
In a sole surface in contact, the second sole portion S ₂ is a sole surface of the first rear sole portion S _1. The second sole portion S ₂ also includes stepped slope of the first immediately behind the sole portion S _1.

In this embodiment, the face portion F
A chamfered portion M is provided at a leading edge portion where the edge portion and the sole portion S intersect. This is to prevent the ball from being damaged when topped. First sole width W ₁ is the width excluding the chamfered portion M.

[0016] In the present invention, the sole width of the golf club head, as shown in FIG. 1, is measured with reference to the position of the face center in the lateral direction when set golf club 1 normal lie angle theta _2. In the case of an iron head or a utility club head, the center of the width in the left-right direction of the corrugation (groove) C formed on the hitting portion of the face surface is generally defined as the face center L. In the case of a wood head, the G.R. The ground point with L (ground line) is the face center.

[0017] When the first sole width W ₁ is smaller than the second sole width W _2, the center of gravity of the golf club head is excessively becomes the rear, the golf club head is likely to fall to the rear. That is, when the player addresses the ball to hit the ball and touches the golf club head to the ground, a sense of strangeness such as a slight retreat is sensed by the head. Accordingly, the present invention has a first width sole W ₁ larger than the second width sole W _2.

[0018] It should be noted that, when the first sole width W ₁ is too wide, turf of resistance is increased when the hit the rough of the ball extending the turf. Further, in a large short irons loft angle, it is possible to swing to drive the golf club head from above, when the first sole width W ₁ is too wide, the sole portion is repelled on the ground, it is easy to top Become.

[0019] From the above, the preferably first sole width _{W 1} is 13～40Mm, preferably 15~25mm especially for normal iron head 1, the utility club head having a hollow portion 2A 2
2-3 mm is preferred. This range is almost the same as the sole width of a normal iron head, and is a range in which a swing can be performed without discomfort.

The total width of the sole S, i.e., the first sole width W _1, the second sole width W ₂ and the width of the chamfered portion M (hereinafter sometimes referred to as "chamfer width".) Of the sum of W ₃ The width W is 1
8 to 80 mm is preferable, and in the case of the iron head 1, 20 mm
~ 35mm, 30 for utility club head
~ 60 mm is preferred.

[0021] It should be noted that the chamfer width _{W 3} is usually 0.5 to 2.0
mm is preferable.

As described above, the loft angle is 27 ° or less,
If the golf club head is 22 ° or less, lower the center of gravity.
In the case of an iron head, the second sole
Width W ₂Is preferably 3 mm or more and 6 mm or less.
In the case of a utility club head, the second
Rule width W₂10 mm or more, especially 15 to 20 mm
Is preferred.

[0023] In the present invention, as shown in FIGS. 1 to 5 is preferably provided with a level difference D between the first and sole portion _{S 1} and the second sole portion _{S 2,} the step D is 0.5 mm Or more, particularly preferably 0.8 mm or more, and
It is preferably 5 mm or less, particularly preferably 3 mm or less.

[0024] The step D is too small, also the second sole portion S ₂ will be grounded, a second order to deepen the centroid
The effect of the present invention for making the sole portion less susceptible to turf resistance is not sufficiently obtained. If this step D is too large, the appearance will deteriorate and the position of the center of gravity of the head will increase,
Not preferred. Therefore, the step D is preferably 0.5 to 5 mm, particularly preferably 0.8 to 3 mm.

[0025] Note that the step-like inclined surface of the first sole portion _{S 1} toward the second sole portion _{S 2,} first its subsequent 2
If the boundary between the flat surface of the sole portion S ₂ is clear as shown in FIG. 4 (b), and step D the height difference between the boundary and the first sole portion S _1. Figure 4 consists slopes stepped surface is curved as (a), the and if the boundary between the inclined surface and a flat sole surface is unclear, the second sole portion from the first sole portion S ₁ S ₂
A point 1 mm before and after the inflection point P on the slope of the slope is taken, and the difference in height is defined as a step D. Further, when the inflection point is difficult to understand, a portion having the largest difference in height with a width of 2 mm is defined as a step D.

[0026] In accordance with a second sole portion _{S 2} is, go to the back side, G. It is preferable to have an inclined surface away from the upper side because it is less likely to be caught on the back portion at the time of swinging and can smoothly swing.

The sole part on the heel side is the first sole part S _1.
May also be more recessed, as shown in FIG. 3, may be formed sole portion S ₃ of the heel side to the second sole portion S ₂ in the same plane. In this way, particularly when hitting a rough ball, the grass is hardly caught, and the swing can be performed extremely smoothly.

In the present invention, the place that is most likely to come into contact with the ground during the swing is slightly above the heel H from the sole center, so that the overall width W of the sole is smaller on the heel H side than on the toe T side. This is preferable because the resistance at the time of contact is small. In particular, for the first sole shape of the sole unit S _1, better width of the heel H side is narrower than the toe T side.

[0029] In the iron head, by which is extended a second sole portion S _2, the weight of the head is increased, the recess (cavity portion) to the back of the face portion F 1A
It is preferable to reduce the weight as a so-called cavity iron head having the above.

In the case of a golf club set such as an iron set, usually, there are included a third iron to a ninth iron, a pitching wedge, and a sand wedge. Since the present invention is applied to a club that hits a ball from a fairway, only an iron set from a third iron to a pitching wedge is used as an iron set.

In the case of the utility club, there are various combinations and the loft angle is wide. In the present invention, the loft angle theta ₁ is a utility golf club set a set of configured utility clubs in the range of 15 ° to 48 °.

In this golf club set, each golf club
The first sole width W of the club head ₁2mm or less
Bottom, especially 1.5mm or less, as a set
You can get a sense of unity.

[0033]

EXAMPLES The effects of the present invention will be described more specifically with reference to the results of actual hit tests performed on a golf club of the present invention and a golf club according to a comparative example.

[Actual hitting test 1: Cavity iron set] <Example 1> Golf club head from a 3 iron to a pitching wedge (PW) having a structure shown in FIGS. Was manufactured using stainless steel SUS630. A cavity having a depth of 4 mm was provided on the rear surface of the head. A step of 0.8 mm was provided between the first sole portion and the second sole portion, and the heel side of the sole portion was formed so as to be flush with the second sole portion. Table 1 below shows the specification of each part of the iron head of the first embodiment.

An iron was obtained by attaching a carbon shaft to each head. The length of each golf club is as follows. 3 irons; 99 cm (39 ") 4 irons; 97.8 cm (38.5") 5 irons; 96.5 cm (38 ") 6 irons; 95.3 cm (37.5") 7 irons; 94.0 cm (37 ") 8 iron; 92.7 cm (36.5") 9 iron; 91.5 cm (36 ") PW; 90.2 cm (35.5")

[0036]

[Table 1]

<Comparative Example 1> As Comparative Example 1, an iron head having only the first sole portion was manufactured according to the specifications shown in Table 2 below, and the same shaft as in Example 1 was attached to form an iron club.

[0038]

[Table 2]

The actual hitting results of the club of Example 1 of the present invention and the club of Comparative Example 1 will be described. In particular, the evaluation was high for a long iron head, which was a 3 iron (I #) with the iron head of the first embodiment of the present invention attached.
In 3), the ball is easily lifted. In addition, even if the ball was rough, it was difficult for the sole to receive the great resistance of the turf, and it was possible to swing smoothly and hit the ball. On the other hand, in the club of Comparative Example 1, the ball was slightly hard to rise, and the ball that entered the rough was not able to successfully hit the ball from the rough due to the resistance of the turf.

In the first embodiment, the short iron (PW) has a narrow sole width in the first sole portion, so that it can be easily hit and can be hit in various ways. Then, the second sole works,
It was evaluated that it was easy to handle because it slid on the sand well. On the other hand, the club of Comparative Example 1 was evaluated to be slightly difficult to work.

In the first embodiment, since the sole width (the width of the first sole) is constant in the entire club set, the feel when the ball is hit from the rough is unified.

[Actual Hit Test 2: Utility Club Set] <Example 2> A utility club head of the present invention was manufactured using stainless steel SUS630. This utility iron head has a hollow portion as shown in FIG. In the case of the utility club head, by providing a hollow portion, the volume of the golf club head having a small number is increased, and efforts are made to expand the sweet area. 1.5 mm from the first sole part to the second sole part
The second sole portion is inclined upward toward the back side.

The utility club is generally positioned as an intermediate club between iron and wood.
It is used as a substitute for long irons by general golfers with slow head speeds. Therefore, in Example 2, a set of the second to fourth utility iron heads was created.

Table 3 below shows the specifications of the head of the second embodiment.

A carbon club having the following length was attached to each head to form a utility club.

No. 2; 104 cm (41 inches) No. 3; 101.5 cm (40 inches) No. 4; 99 cm (39 inches)

[0047]

[Table 3]

<Comparative Example 2> A utility club head having a second sole width wider than the first sole width was manufactured according to the specifications shown in Table 4 below, and the same shaft as that in Example 2 was attached to obtain a utility club head.

[0049]

[Table 4]

<Comparative Example 3> The first sole was provided without the second sole part.
A utility club head consisting solely of a sole portion was manufactured according to the specifications shown in Table 5 below, and the same shaft as in Example 2 was attached to the utility club head.

[0051]

[Table 5]

As a result of performing a test hit comparison between the utility club of Example 2 and the utility club of Comparative Example 2, the head of the utility club of Comparative Example 2 was likely to fall rearward when addressed, and it was difficult to stabilize the head. In Example 2, the sole portion sat firmly on the ground and was stable.

Next, a test hit comparison was made between the utility club shown in Example 2 and the utility club of Comparative Example 3. As a result, when a semi-rough ball with the turf slightly extended from the fairway was actually hit, Example 2 was used.
In comparison with Comparative Example 3, the resistance from the turf to the sole portion was smaller than that of Comparative Example 3, and it was easier to hit as if hitting a middle iron. Further, since the sole has a constant width, the resistance received by the sole is almost the same in each club, and the hit feeling is unified.

[0054]

As described above in detail, according to the present invention, even if the golf club head has a loft angle of 27 ° or less, the golf club head has a low center of gravity and is hardly affected by turf resistance. A golf club is provided which has a constant resistance received from the turf during a swing and provides a uniform hit feeling as a set. According to this club, the flight distance can be extended as compared with the conventional product, and the ball can be accurately hit in various ways from various situations.

[Brief description of the drawings]

FIG. 1 is a front view showing a golf club head according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a bottom view of the golf club head of FIG. 1;

FIG. 4 is an enlarged view of a bottom portion of the head of FIG. 2;

FIG. 5 is a cross-sectional view showing another embodiment of the golf club head of the present invention.

[Explanation of symbols]

1, 2 golf club head 1A concave portion 2A hollow portion F face portion M chamfered portion S sole portion S ₁ first sole portion S ₂ second sole portion

Claims (7)

[Claims] 1. A golf club head made of metal, wherein a sole portion on a bottom surface of the golf club head has a face portion.
1st sole part S for contacting the ground located on the
₁And located on the back side, higher than the first sole portion
The formed second sole portion S₂And the first sole portion S at the face center.₁Sole width
W₁Is the second sole part S ₂Sole width W₂Greater than
And a golf club head. 2. The golf club head according to claim 1, wherein the loft angle is 27 ° or less. 3. The method of claim 1 or 2, a head of an iron club, _{W 1} is 15 to 25 mm, the golf club head the entire width of the sole portion is characterized in that it is a 20 to 35 mm. 4. The method of claim 1 or 2, a head of the utility club having a hollow portion in the head body, _{W 1} is 22～35Mm, and wherein the entire width of the sole portion is 30~60mm Golf club head. 5. In any one of claims 1 to 4, the first sole in the face center portion S ₁ and the second
The golf club head, wherein the step of 0.5~5mm is provided between the sole portion S _2. 6. A any one of claims 1 to 5, the whole of the sole of the heel side of the golf club head, characterized in that it is formed by the second sole portion S ₂ in the same plane Golf Club head. 7. A golf club comprising the golf club head according to any one of claims 1 to 6.