JP3509724B2 - Golf club head - 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, and more particularly to a golf club head having a large head width from the club face toward the back side.

[0002]

2. Description of the Related Art Generally, it is required for a golf club to swing well, that is, to have a low resistance between the sole of the golf club head and the ground.
Since the wood club has a large head width structure in which the head is largely protruded from the club face in the bag side direction, it has a large sole area and is particularly suitable for so-called fairway woods for hitting a ball placed on the ground. This request is strong.

Usually, such fairway woods are
Form the sole in a flat shape, or provide multiple rail-shaped projections extending from the face side to the back side on the sole to prevent the head from changing direction when the sole touches the ground, that is, "head shake" There are many things to do.

However, in the case of a golf club head in which the entire surface of the sole is formed flat, if the golf club head comes into contact with the ground during impact, the entire head is repelled from the ground, making it difficult to accurately grasp the ball. Is. Further, in the case of a golf club head having rail-shaped protrusions provided on the sole, the head speed is lowered because these protrusions bite into the ground at the time of hitting, and therefore the flight distance of the ball is not extended.

On the other hand, Japanese Patent Publication No. 5-14594 discloses that
A golf club head is disclosed in which the sole surface is projected downward, and the dimension between the toe and the heel of the sole surface is gradually narrowed toward the back side. This golf club head has a small sole surface, so even if it is possible to reduce bounce on the ground, this sole surface is aligned at the same height as the peripheral portion on the face side,
The length of the lower edge of the face is long, and therefore, when the ball is hit, a large amount of resistance is generated by the rough.

Further, Japanese Utility Model Publication No. 1-82070 discloses that
A recess is formed inside the outer edge of the sole, and in this recess,
A golf club head in which a sole plate thicker than this is fixed and a step portion is formed along the entire circumference of the sole plate is described. In addition to the leading edge along the boundary between the face and the sole, this golf club head also has sharp corners on the face side edge of the sole plate, which increases the resistance when contacting the ground or rough surface. Therefore, the swing is bad.

The present invention has been made under such circumstances, and an object of the present invention is to provide a golf club head which can accurately catch a ball and swings easily.

[0008]

In a golf club head of the present invention that achieves the above object, a first sole that contacts a club face via a leading edge formed of a smooth curved surface, and the first sole is surrounded. A second sole, and the first sole is arranged so as to protrude from the club face more than the second sole, and extends from the leading edge toward the back side to the vicinity of the central portion of the first sole. with the toe-heel direction dimension is formed between the side edges and the heel-side edge portion is gradually expanded, between these first sole and the second sole, circle diameter on the second sole side
It is characterized in that a conical inclined surface is formed.

[0009]

1 to 5 show a head 10 which is a golf club head according to a preferred embodiment of the present invention.
Indicates. The head 10 of this embodiment is a club face having a high elasticity and a high strength for hitting a ball, that is, the face 1.
2 has a large head width structure in which the back 14 is largely protruded, and is formed as a metal head having a hollow outer shell structure made of a suitable metal material such as titanium, titanium alloy, or stainless. This head 1
0 is commonly called a fairway wood for hitting a ball placed on the ground, or a utility club head formed with a head width between the face and the back of, for example, 40 mm or more. It is preferably applied to hollow irons. Of course, the head 10 may be formed in a solid structure.

Further, the head 10 has a structure in which a hosel 20 is projected from a top 18 on the heel 16 side. The hosel 20 is formed at the top of a tubular portion 22 extending from the top 18 to the sole portion 26 in a state of being slightly inclined in the direction of the toe 24.
The shaft can be fixed to the head 10 by inserting and adhering the tip of a shaft (not shown) into the shaft fixing hole 30 formed by penetrating the shaft. This tubular part 2
The length of the hosel 20 that protrudes from the top 18 of the second hosel 20 can be adjusted as appropriate, and when the end of the tubular portion 22 is arranged in the same plane as the top 12, the hosel 20
Can be formed on the head 10 having no.

In this embodiment, the cylindrical portion 22 forming the shaft insertion hole 30 is integrally formed of the same material as the head 10. Of course, the tubular portion 22 can be formed separately from the head 10 and using a different material. In this case, the lower end of the tubular portion 22 is attached to the sole portion 26.
It is desirable to weld them so that they are flush with. The shaft inserted into the shaft insertion hole 30 is made of a suitable composite material such as a fiber reinforced resin, which is preferably a carbon fiber reinforced resin, and has a large adhesion range to the head 10. It is inserted over the entire shaft insertion hole 6 so as to penetrate the portion 26. Since the tip end opening of the shaft is exposed on the side of the sole portion 26, the tip end opening of the shaft is closed by a suitable plug preferably made of synthetic resin. in this case,
The tip of the shaft and the end surface of the plug are formed on the same surface as the sole portion 26. In addition, the shaft insertion hole 30 on the top 18 side
A cover member (not shown) can be provided at a portion of the shaft projecting from the shaft.

Further, the head 10 in this embodiment is
A side 32 extends from the peripheral portion excluding the face 12, that is, from the toe 24 to the heel 16 via the back 14. The side 32 is formed by a cylindrical, conical, or spherical curved surface that intersects the top 18 and the sole portion 26, and is formed widest on the toe 24 side close to the face 12, and the back 14 and the heel 16 are formed. The width is gradually narrowed toward. It should be noted that such a side 32 is for the purpose of explanation, and it is not always necessary to clearly specify the part thereof, and for example, the top 1
It may be one that smoothly transitions from 8 to the sole portion 26.

Further, as shown in FIGS. 4 and 5, a weight 34 having an appropriate weight for lowering the center of gravity of the head 10 is located at a position substantially at the center in the toe-heel direction and offset from the back 14 toward the face 12 side. It is fixed inside the sole portion 26. The number of weights 34 is not limited to one, and the number and mounting position of the weights can be appropriately selected in consideration of the overall weight and balance of the club. Further, it may be formed integrally with the sole portion 26.
In the present embodiment, the weight 34 is arranged at a position corresponding to the top portion 60 of the sole portion 26 described later.

As best shown in FIG. 3, the sole portion 26
Is the first sole 3 that contacts the lower edge of the face 12 via the leading edge 36 formed of a smooth curved surface.
8 and the outer periphery of the first sole 38 is the side 3
2 has a second sole 40 in contact with the second sole 40, and between the first sole 38 and the second sole 40, a narrow inclined surface 42 whose diameter increases on the second sole 40 side is formed. The inclined surface 42 has a leading edge 36 on the face 12 side.
Therefore, as shown clearly in FIGS. 1 and 2, the peripheral wall of the first conical surface of the first sole 38, which is arranged so as to project outward from the club face 12 more than the second sole 40, is formed. Form. In the leading edge 36, the portion corresponding to the first sole 38 on the center side is the second sole 40.
It projects more outward than the part corresponding to. The protrusion amount of the first sole 38 with respect to the second sole 40, that is, the height of the inclined surface 42 is, for example, the toe of the first sole 38 in order to improve the swing-out while maintaining the low center of gravity of the head 10.
It is almost 2 in the part where the width in the heel direction is the largest.
It is preferably formed in a range of about 10 mm. It is needless to say that such inclined surfaces 42 do not have to be formed at the same height over the entire circumference, and a height difference may be provided if necessary. Further, the inclined surface 42 is formed by a spherical curved surface,
You may make it move smoothly to each of the 1st sole 38 and the 2nd sole 40.

Further, in this embodiment, the first sole 38
Has two face side guide surfaces 44, 46 arranged on the face 12 side and two back side guide surfaces 48, 50 adjacent to the face side guide surfaces 44, 46.
6 continues to the leading edge 36 of the curved structure. A ridge line portion 52 that smoothly transitions from the leading edge 36 and extends toward the back 14 side is formed between the face-side guide surfaces 44 and 46, and these face-side guide surfaces 44 and 46 form the ridge line portion. It is formed as an inclined surface which inclines in the opposite direction with 52 interposed therebetween. Similarly,
The back side guide surfaces 48, 50 are also formed as inclined surfaces that are inclined in opposite directions with the ridge line portion 54 formed therebetween interposed therebetween.

Further, between the face side guide surfaces 44 and 46 and the back side guide surfaces 48 and 50, there are toe
Ridges 56, 58 extending in the heel direction are formed, and these four ridges 52, 54, 56, 58 are
The most protruding top portion 60 is formed at approximately the center of the first sole 38. In addition, these ridge line parts 52, 54, 56, 5
Although the reference numeral 8 and the top portion 60 are clearly shown in the drawing for the sake of explanation, it is preferable that both the ridge portion and the top portion are actually formed into a curved surface having a large radius of curvature. Further, each of the guide surfaces 44, 46, 48, 50 may not be a flat surface, but may be a convex or concave smooth curved surface.

In the sole portion 26 of this embodiment, the size of the first sole 38 in the toe / heel direction is the leading edge 36.
Is smaller than the width of the face 12, the ridge line portion 56,
The largest part is formed near 58, and back 1
It becomes gradually smaller as it goes to the 4th side. Therefore, a toe formed between the toe side edge of the face side guide surface 44 and the heel side edge of the face side guide surface 46.
The dimension in the heel direction gradually increases from the leading edge 36 toward the back 14 side up to the vicinity of the ridges 56 and 58. Further, the ridge line portion 52 between the face side guide surfaces 44 and 46 gradually protrudes from the leading edge 36 side to the top portion 60.

Next, the operation of the head 10 of this embodiment will be described with reference to FIGS. 6 and 7. The figure shows a state in which the ball B is supported by the rough R. When the ball is hit in this state, the rough R hitting the leading edge 36 located at the lower edge of the face 12 becomes
While moving forward along the curved surface of 6, the downwardly projecting portion corresponding to the first sole on the center side thereof is tilted in the toe / heel direction corresponding to the second sole 40. And
Toe side and the heel side edge portion of the face-side guide surface 44, 46 of the first sole 38, and, along the inclined surface 42 towards the toe-heel direction toward the back 14 side, tow 2
It is divided into 4 directions and 16 heel directions. Next, the rough R separated by the first sole 38 is
The second sole 40 arranged in the peripheral portion presses down in the ground direction. The head 10 passes in this state. The head 10 does not receive much resistance from the rough R.

When the head 10 hits the ground, the first sole 38 hitting the ground is inclined from the face-side guide surfaces 44 and 46 and the back-side guide surfaces 48 and 50 with the ridges 52 and 54 interposed therebetween. Since it is formed, the contact area with the ground is small, and therefore the head 10 is not repelled largely. Further, only the first sole 38 projects from the lower edge of the face 12, and the first sole moves from the face 12 along the smooth curved surface of the leading edge 36, so that it does not receive a large resistance from the ground. .

[0020]

As is apparent from the above, according to the present invention,
The resistance received from the ground or the rough is small, so that the ball can be accurately caught, and a golf club head with good swing-out is provided.

[Brief description of drawings]

FIG. 1 is a front view of a golf club head as seen from the face side, according to a preferred embodiment of the present invention.

2 is a side view of the golf club head of FIG. 1 viewed from the toe side.

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

4 is a cross-sectional view taken along the line IV-IV of FIG.

5 is a cross-sectional view taken along the line VV of FIG.

FIG. 6 is an explanatory diagram of a state where a ball is hit on a rough.

FIG. 7 is an explanatory diagram of a hit ball shown together with a ball on a rough.

[Explanation of symbols]

10 ... Head, 12 ... Face, 14 ... Bag, 16 ...
Heel, 24 ... Toe, 36 ... Leading edge, 38
... 1st sole, 40 ... 2nd sole, 44, 46 ... Face side guide surface, 52, 54, 56, 58 ... Ridge line part.

Claims (2)

(57) [Claims] 1. A club face has a first sole that contacts with a leading edge formed of a smooth curved surface and a second sole that surrounds the first sole, and the first sole extends from the club face. , A toe that is arranged so as to project more than the second sole and that is formed between the toe side edge and the heel side edge from the leading edge toward the back side to the vicinity of the center of the first sole. A golf club characterized in that the dimension in the heel direction gradually increases and a conical inclined surface whose diameter increases on the second sole side is formed between the first sole and the second sole. head. 2. The first sole has two inclined surfaces extending from the leading edge toward the back side, and these inclined surfaces smoothly transition from the curved surface of the leading edge to the back side. The golf club head according to claim 1, wherein a ridge line portion extending toward the ridge is formed.