JP4154506B2 - Wood club head - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a wood club head having a metal hollow shell structure.
[0002]
[Prior art]
With wood type golf club heads, it is important to expand the so-called sweet area, which is the area close to the center of the ball striking face, because the shaft tends to be long to increase the flight distance. Large heads are the mainstream. Also, in order to enlarge the sweet area on the face surface that becomes the ball striking surface, it is better to move the position of the center of gravity of the head to the rear of the head, and the ball striking surface is made of a hard material to increase its repulsive force. Is good.
[0003]
[Problems to be solved by the invention]
However, the wood club head is usually formed by casting or forging the individual parts of the head such as the crown, face, sole, and neck individually or in combination of 2 to 3 at most. Are assembled and manufactured. In addition, since welding is generally difficult if the metals are not homogeneous, it is difficult to press and bond a part of the head to a dissimilar metal with a high specific gravity in order to move the center of gravity of the head without using simple welding. It will be limited to special methods, such as these.
[0004]
In addition, in order to suppress the increase in the head weight when the head is enlarged, the head is made of a thin shell body having a low specific gravity and a high strength such as a titanium alloy, and a high-hardness material that further increases the repulsive force of the striking surface is adopted. Therefore, when a different specific metal having a high specific gravity is press-fitted into a part of the head in an attempt to move the center of gravity of the head, there is a problem that the thin shell is likely to be deformed around the press-fitted part.
[0005]
In view of such circumstances, an object of the present invention is to provide a metal-made wood club head having a large hollow thin shell that allows easy movement of the center of gravity of the head.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is a hollow thin shelled wood club head having a volume of 230 cc or more, and a head rear portion corresponding to 20 to 40% of the head volume is used as the remaining head front portion. In comparison, it is made of a soft and high specific gravity material, and is formed thicker than the crown and sole portions of the front portion. A hollow thin-walled shell structure with a crown part and a sole part coupled to the lower part and an opening at the rear part. The head rear part has a front part as an opening part at the upper part and a crown part at the lower part and a back side part at the lower part. It has a structure in which a continuous sole part is formed, and the front part is made of high-strength hard titanium alloy, and the rear part is soft and excellent in workability. Any of pure titanium, KS100 titanium, and KS120 titanium And at least one plate-like weight is fitted in the back side of the head rear portion or the portion extending from the back side to the sole portion, and a beryllium copper, tungsten alloy is formed in the opening. 20 to 40 g weight made of any one of nickel alloy, copper alloy, and stainless steel is press-fitted and fitted.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the drawings.
[0008]
FIG. 1 shows a rear view of a driver wood club head of the present embodiment. In FIG. 1, the head is divided into a head front portion 1A on the hosel portion 2 side and a head rear portion 1B indicated by spots in the figure, and a hosel portion 2 to which a shaft 3 is inserted. It is composed of The weight of the head is 200 g, and the volume of the head body 1 is 270 cc. The head front portion 1A has a hollow thin shell structure that includes a face surface 4 serving as a ball striking surface on the front surface, a crown portion 5 on the top, a sole portion 6 on the bottom, and an opening on the back. The material is a high-strength hard β-titanium alloy (6-4 titanium alloy). Further, the wall thickness is 3 mm on the face surface 4 to be a hitting surface, 1 mm on the crown portion 5, and 1.2 mm on the sole portion 6. Note that a hosel portion 2 to which the shaft 3 is inserted is provided at one end of the crown portion 5.
[0009]
Further, the head rear portion 1B has a front portion as an opening, and a crown portion 5 at an upper portion and a back side portion 7 at a lower portion and a sole portion 6 connected thereto. The material of the rear portion 1B is pure titanium, KS100 titanium, or KS120 titanium (specific gravity 4.5) that is high in strength but soft and excellent in workability, and has a thickness of 2 mm throughout. As shown in the plan view of FIG. 2, the two openings are abutted and welded to form a head.
[0010]
The volume of the rear portion 1B is preferably selected in the range of 20% to 40% of the volume of the head body 1, but is 22% in this embodiment. Therefore, in the present embodiment, the volume of the front portion 1A is 78%. The material of the rear portion 1B is the same as that of the front portion 1A that can be welded to the front portion 1A. However, the thickness is set to be thicker than that of the front portion 1A in order to increase the weight.
[0011]
Further, as shown in FIG. 3 in which the head is a cross section, a beryllium having a width of 40 mm, a length of 50 mm, a thickness of 2.5 mm, and a weight of about 40 g from the back side portion 7 to the sole portion 6 of the rear portion 1B. A weight 8 made of copper (specific gravity 8.3) is fitted by press-fitting. In the drawing, Ix indicates the inertia moment in the vertical direction of the head, and this Ix is increased by increasing the weight of the head rear portion 1B, and the launch angle is stabilized at the time of impact, and a stable flight distance can be obtained. .
[0012]
The weight 8 is made of a material having a specific gravity larger than that of the rear portion 1B, but the weight is preferably selected within the range of 20 to 40 g in view of the head weight, which is normally 200 g. . In order to effectively move the center of gravity to the lower back of the head, it is preferable that the specific gravity of the weight 8 is 1.5 times larger than that of the head rear portion 1B.
[0013]
The form of the weight 8 can be a single object as in this embodiment, or a plurality of weights can be arranged in a balanced manner on the toe 9 side and the heel 10 side. In addition to beryllium copper, materials having heavy specific gravity such as tungsten alloy, nickel alloy, copper alloy, and stainless steel are used.
[0014]
The size of the rear portion 1B of the head is set so that the volume of this portion is in the range of 20 to 40% of the head volume. The volume of the rear portion 1B is less than 20%. This is because the movement of the center of gravity of the head cannot be sufficiently performed. On the other hand, if it exceeds 40%, there is a concern about an excessive head weight and the movement of the center of gravity of the head to the rear and low parts becomes ineffective. In the present invention, the head main body 1 is a head portion excluding the hosel portion 2 to which the shaft 3 is inserted.
[0015]
【The invention's effect】
As described above, according to the present invention, a hollow thin shelled wood club head having a volume of 230 cc or more, the head rear portion corresponding to 20 to 40% of the head volume is used as the remaining head front portion. In comparison, it is made of a soft and high specific gravity material, and is formed thicker than the crown and sole portions of the front portion. A hollow thin-walled shell structure with a crown part and a sole part coupled to the lower part and an opening at the rear part. The head rear part has a front part as an opening part at the upper part and a crown part at the lower part and a back side part at the lower part. It has a structure in which a continuous sole portion is formed, and the front portion is made of high-strength hard titanium alloy, and the rear portion is soft and excellent in workability, either pure titanium, KS100 titanium, or KS120 titanium Forming an opening in which at least one plate-like weight is fitted to the back side of the head rear part or a portion extending from the back side to the sole part, and a beryllium copper, a tungsten alloy, Since 20 to 40 g of weight made of nickel alloy, copper alloy, or stainless steel is press-fitted and fitted, it is easy to move the center of gravity of the head to the rear and the lower part of the head. As a result, the sweet area on the face surface is expanded to reduce the impact of removing the core even with a long shaft, and a high trajectory can be obtained with a low center of gravity, so that an increase in flight distance can be expected.
[0016]
Further, when the plate-like weight having a very large specific gravity different from that of the head body is press-fitted into the rear part of the head for the movement of the center of gravity of the head, the rear part is made of a soft material. The peripheral edge of the opening provided in the rear part where the weight is fitted is easily crushed by press-fitting, and this reduces the force during press-fitting, and the rear part of the head is thickened, so the periphery of the press-fitted part Deformation of the head main body is effectively prevented.
[0017]
Furthermore, when the material thickness of the plate-like weight is set, the head center of gravity can be moved further rearward and to a lower part.
[Brief description of the drawings]
FIG. 1 is a rear view.
FIG. 2 is a plan view.
FIG. 3 is an end view taken along line AA in FIG. 2;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Head main body 1A Head front part 1B Head rear part 6 Sole part 7 Back side part 8 Weight

Claims (3)

A hollow thin-walled wood club head having a volume of 230 cc or more,
The head rear part corresponding to 20 to 40% of the head volume is made of a softer and higher specific gravity material than the remaining head front part, and thicker than the crown part and sole part of the front part. And
The head front portion has a face surface that is a ball striking surface on the front surface, a crown portion on the top, a sole portion on the bottom, and a hollow thin shell structure with an opening on the back.
The head rear part has a structure in which a front side is an opening, a crown part is formed at the upper part, a back side part is formed at the lower part, and a sole part connected to this is formed.
The front part is made of high-strength hard titanium alloy and the rear part is made of pure titanium, KS100 titanium, KS120 titanium, which is soft and excellent in workability,
Forming an opening in which at least one plate-like weight is fitted to the back side of the head rear portion or a portion extending from the back side to the sole portion;
A wood club head characterized in that a 20 to 40 g weight made of any one of beryllium copper, tungsten alloy, nickel alloy, copper alloy, and stainless steel is press-fitted into the opening.   2. The wood club head according to claim 1, wherein the weight is a plate-like member having a high specific gravity and a thickness of 1.5 times or more than a rear portion of the head.   The wood club head according to claim 1 or 2, wherein the openings of the front part and the rear part are butted and welded together.

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