JPH11347157A - Wood club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy-to-hit wood club head with which a deep centroid and a low centroid are attained by providing the golf club head with at least one projecting parts which project downward to an area in the second half part of a sole part in the state of addressing the ball while setting a loft angle and lie angle normal. SOLUTION: The head 1 of a wood club is provided with the three projecting parts 7 which project downward from the sole part 30 to a trailing edge 6 backward from about the mid-point C of the head width by setting the head width, which is the distance from the leading edge 4 of a clubface 2 to a back side end 5 at 80 mm in the normal addressing state of the head. The centroid (C, G) of the head 1 is brought to the height of 16 mm from the sole part 30 by the installation effect of the projecting parts 7. The height is extremely lower than a general centroid height of >=20 mm of a conventional type. In such a case, the centroid depth measured in a direction perpendicular to the clubface 2 from the centroid is 30 mm and may be set at a value sufficiently deeper than about 25 mm which is the value generally considered to be shallow in the centroid height.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood club head, and more particularly to an improvement of a wood club head, such as a driver, which is often hit by teeing up.

[0002]

2. Description of the Related Art It is known that the position of the center of gravity of a club head greatly affects the flight distance and directionality of a hit ball.
In a metal wood club head having a hollow shell structure, in general, the center of gravity is deepened, and the point where a line drawn perpendicularly from the center of gravity to the face surface intersects with the face surface, that is, the position of the center of gravity on the face surface is determined. Lowering has been done. By making the center of gravity deeper away from the face, the sweet area on the face (the maximum flight distance of 95
% Or more) and lowering the position of the center of gravity on the face surface so that the ball can be easily placed on a high trajectory.

[0003]

However, in the conventional club design, if the center of gravity of the head is set to be deep, the position of the center of gravity on the face is inevitably higher, and in many cases, the center of gravity of the face is higher than the center of the face. As the center of gravity is located above, there is a tendency that the ball tends to hit below the position of the center of gravity, the hitting of the hit ball is low, the backspin amount increases, and the flight distance is suppressed. Also, if you try to lower the center of gravity on the face, the center of gravity of the head becomes shallower, the sweet area decreases, and the professional ratio is high, such as a professional who has a high meat rate (the degree of hitting the ball at the target position on the face). A club that is difficult to hit (does not hit the core) for other players. On the other hand, even when trying to make the center of gravity of the head shallow as an advanced club,
When the head is viewed from above, the moment of inertia around the vertical axis passing through the center of gravity of the head becomes small, and there is a concern that the directionality of the hit ball may be deteriorated.

It is an object of the present invention to provide an easy-to-hit wood club head having a deep center of gravity and a low center of gravity.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention relates to a metal club head having a metal hollow shell, and a sole portion in a state where a loft angle and a lie angle are normally addressed. In the rear half area, at least one convex portion protruding downward is provided.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a face surface 2 when a driver wood club head 1 is normally addressed.
FIG. 3 is a cross-sectional view taken along the width direction of the head 1 at the center of FIG. FIG. 2 is a bottom view of the head 1 as viewed from the sole surface 3. In FIG. 1, the leading edge 4 of the face 2
The width of the head from the front side to the back side end 5 is 80 mm, and three convex portions 7 protruding below the sole portion 30 from substantially the middle point C of the head width to the trailing edge 6 rearward. Is provided.

As shown in FIG. 3, the convex portion 7 has a semicircular cross section, a size of 5 mm in width and 6 mm in height, and employs a beryllium copper having a specific gravity of 8.9. The convex portion 7 is formed by providing three grooves in a shell wall of a sole portion 30 having a thickness of 1.2 mm, and attaching the rod-shaped convex portion 7 to the groove by press fitting.

The thickness of the face 2 of the head 1 is 3
mm, the thickness of the shell of the head 1 excluding the face surface 2 is 1.2 over the crown 8, the backside 9, and the sole portion 30.
mm. The whole head has a hollow shell structure of titanium alloy, and its height, width and length are 55 m each.
m, 80 mm, and 110 mm.

In the head 1 of this embodiment, the center of gravity of the head 1 is shifted to the sole 30
(In this embodiment, the club is horizontal when the club is normally addressed.) The height becomes 16 mm, which is extremely lower than the height of the center of gravity of 20 mm or more which is generally used in conventional products. I have. Further, in the present embodiment, the face 2
The depth of the center of gravity measured in the vertical direction is 30 mm, which is set to a value sufficiently deeper than the value of the depth of the center of gravity of about 25 mm which is generally considered to be shallow.

It is preferable that the convex portion 7 protrudes 2 to 15 mm below a line connecting the leading edge 4 of the face surface 2 and the midpoint C of the head width on the surface of the sole portion 30. Most preferably, the amount of protrusion is 5-7.
mm. Although the inside of the convex portion 7 can be left hollow, the convex portion 7 is preferably made of a material having a specific gravity of 7 or more and not solid but solid.

[0012]

As described above, according to the present invention,
In a normal address state, at least one convex portion protruding downward is provided in the rear half area of the sole portion, so that the weight behind and below the head can be easily increased, and The center of gravity can be set rearward, that is, deep, and at the same time, the position of the center of gravity on the face surface can be set lower to lower the center of gravity. As a result, the position of the center of gravity on the face can be easily matched to the center of the face, and the center of gravity of the head is deep and the sweet area on the face is enlarged, so that it is easy to hit with a so-called core,
The energy of the head is efficiently consumed for hitting the ball, and the hit ball is easily lifted at a low center of gravity, so that the flight distance is increased. On the other hand, for advanced users, even when the weight of the shell is distributed to the front face side of the head and the center of gravity of the head is moved forward to set the center of gravity of the head shallower, the large weight before and after the head is large. As a result, the moment of inertia increases, and the directionality of the hit ball is stabilized. Further, in the golf club head according to the present invention, as described in claim 2, a material having a specific gravity greater than the specific gravity of the material of the shell forming the head inside the convex portion provided at the rear lower part of the sole portion. In addition to increasing the effect of the first aspect, the moment of inertia around the center of gravity of the head is further increased, and the directionality of the hit ball is further stabilized.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a bottom view.

FIG. 3 is a sectional view taken along line aa of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head 2 Face surface 3 Sole surface 4 Leading edge 5 Backside end 6 Trailing edge 7 Convex part 30 Sole part

Claims (2)

[Claims] 1. A wood club head having a hollow metal shell, wherein at least one convex shape protruding downward into a rear half area of a sole portion in a state where a loft angle and a lie angle are normally addressed. A wood club head, characterized in that a part is provided. 2. The wood club head according to claim 1, wherein a weight having a specific gravity greater than that of the shell is disposed in the convex portion.