JP2842289B2 - Golf wood 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 wood club head having an outer shell structure of fiber reinforced plastics (hereinafter abbreviated as FRP), and more particularly, to the moment of inertia of the head body, which is determined by the thickness of the FRP outer shell. By increasing the size without changing the shape, the sweet spot can be enlarged, the flight distance and wear resistance can be improved by stabilizing the direction of the ball, and the position of the center of gravity of the head can be easily adjusted. It was made.

[0002]

2. Description of the Related Art Conventionally, in this type of wood club head made of FRP, as shown in FIGS. 3 and 4, the head body 1 is made of an outer shell structure of FRP 2 using carbon fiber or glass fiber as a reinforcing fiber. There is something.

The center of mass distribution of such a head body 1 is located at a center point O in the thickness direction of the thickness t of the FRP outer shell 2, and the moment of inertia is represented by the center of gravity G and the distribution of mass. It is well known that it is proportional to the square of the distance L connecting the center.

[0004]

However, in the above-described conventional wood club head, as shown in FIG. 3, the ball 10 is hit at the time of hitting, for example, on the toe 3a side of the face surface 3 of the head main body 1. When hit, the head main body 1 tends to be blurred so as to rotate clockwise N about the center of gravity G.

[0005] As a result, a spin in the counterclockwise direction S is applied to the ball 10 by a gear effect, so that the directionality of the ball 10 with respect to the hitting direction X becomes unstable, and the flight distance is reduced.

Therefore, in order to stabilize the direction of the ball 10 due to the movement of the head body 1 at the time of hitting the ball, it is conceivable to increase the thickness t of the FRP outer shell 2 itself and increase the moment of inertia. When the thickness t of the FRP outer shell 2 itself is increased, the total weight of the head increases, and there is a problem that the weight cannot be reduced.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to increase the moment of inertia of a head body composed of an FRP shell without changing the thickness and shape of the FRP shell, thereby enlarging the sweet spot and increasing the ball direction. It is an object of the present invention to provide a golf club head for golf which improves flight distance and abrasion resistance by stabilizing the golf ball and can easily adjust the center of gravity of the head.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention covers a metal film layer on the outer peripheral surface of a head body having an FRP shell structure, and reduces the thickness of the metal film layer. A portion corresponding to the back surface side of the head body and
Thickness of the part corresponding to the sole side is thicker than the part equivalent to the top side
Characterized in that, in this case, the metal
The film layer may be formed by plating, bonding, or thermal spraying.
Formed by

[0009]

In other words, the present invention adopts the above-described structure, and since the outer peripheral surface of the head body having the FRP shell structure is covered with the metal film layer, the FRP shell of the conventional head body is Compared to the same shape, the distance between the center of gravity and the center of distribution of the mass is longer, so that FR
The moment of inertia of the head main body can be increased without changing the thickness and shape of the P outer shell, and the sweet spot can be enlarged.

In addition, since the outer peripheral surface of the head main body is made of a metal film layer, the flight distance and wear resistance can be improved by stabilizing the directionality of the ball.

Further, by partially changing the thickness of the metal film layer, the distribution of the position of the center of gravity of the head can be easily adjusted.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings shown in FIGS. In the illustrated embodiment according to the present invention, portions having the same configuration as those of the conventional structure shown in FIGS. 3 and 4 will be described using the same reference numerals.

As shown in FIG. 1, the golf wood club head according to the present invention has an FR
The entire outer peripheral surface 2a of the P outer shell 2 is covered with a metal film layer 4, and the metal film layer 4 has a thickness d1 of the back surface side equivalent portion 4a and the sole surface side equivalent portion 4b of the head main body 1. and d2 is one having a formed by partially changed to be thicker than the thickness d of the upper surface side corresponding site 4c (d <d1, d2) configuration.

Therefore, according to the above configuration, the outer peripheral surface 2a of the FRP outer shell layer 2 of the head body 1 is covered with the metal film layer 4 having a specific gravity larger than that of the FRP.
When comparing the shape of the RP outer shell 2 with the same shape as the conventional one, as shown in FIG.
The RP outer shell 2 shifts outward from the center point O in the thickness direction of the thickness t, whereby the distance L1 connecting the center of gravity G and the distribution center O1 of the mass is longer than that of the conventional structure (L <L
1) It becomes possible.

As a result, the moment of inertia of the head main body 1 is increased, the sweet spot can be enlarged, and the metal film layer 4 is formed of the back surface side portion 4a and the sole surface side portion 4b of the head body 1. The thicknesses d1 and d2 are greater than the thickness d of the upper surface side equivalent portion 4c (d <d
d1, d2), the position of the center of gravity G shifts to the rear of the head, the depth of the center of gravity becomes deeper, and when the ball is hit, the backspin is easily applied to the ball, and the ball rises On the other hand, the position of the center of gravity G also shifts downward, so that the center of gravity can be reduced.

The FRP shell layer 2 of the head body 1
As the type of the metal film layer 4 coated on the outer peripheral surface 2a, for example, chrome or nickel is suitably used, and these are appropriately selected according to conditions such as hardness, weight, appearance, and adhesion. Things.

The means for coating the metal film layer 4 is, for example, plating, vapor deposition, bonding or thermal spraying.
The thickness is preferably 1 mm or less excluding a thick part such as a and the sole surface side equivalent part 4b.

In the above embodiment, the metal film layer 4 is coated on the entire outer peripheral surface of the head main body 1. However, for example, the outer peripheral surface of the head main body 1 excluding a part of a hosel portion surface where the shaft is inserted is inserted. May be applied partially.

[0019]

As is apparent from the above description, according to the present invention, since the outer peripheral surface of the head body having the FRP shell structure is coated with the metal film layer, the FRP shell of the conventional head body is The distance between the center of gravity and the center of mass distribution can be made longer than that of the same shape.

Thus, since the moment of inertia of the head body can be increased without changing the thickness and shape of the FRP outer shell, the sweet spot can be enlarged.

In addition, the increase in the moment of inertia reduces the movement of the head when hitting a ball, so that the directionality of the ball can be stabilized and the flight distance can be increased.

Further, since the outer peripheral surface of the head of the FRP shell is covered with the metal film layer, the wear resistance can be improved.

Furthermore, by partially changing the thickness of the metal film layer, the distribution of the center of gravity of the head can be easily adjusted, and the characteristics of the head itself can be controlled.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a golf wood club head according to the present invention.

FIG. 2 is an explanatory diagram showing the position of the center of gravity of the head body and the distribution center of the mass.

FIG. 3 is an explanatory view of a conventional wood club head for golf.

FIG. 4 is an explanatory view showing the position of the center of gravity of the head main body and the distribution center of mass in the cross-sectional shape taken along the line AA in FIG. 3;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Head body, 2 ... FRP outer shell, 2a ...
Outer peripheral surface, 3 ... face surface, 4 ... metal film layer, 4
a: Back surface side equivalent portion, 4b: Sole surface side equivalent portion, 4c: Upper surface side equivalent portion, d: Upper surface side phase
Thickness of this part, d1 ... thickness of part equivalent to the back surface side,
d2: thickness of a portion corresponding to the sole surface side, G: center of gravity,
O1: distribution center of mass, L1: distance connecting the center of gravity and the distribution center of mass.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A63B 53/04

Claims (2)

(57) [Claims] An outer peripheral surface of a head body having an FRP shell structure is coated with a metal film layer, and the metal film layer is covered with the metal film layer.
A portion corresponding to the back surface side of the head body and a side surface side phase
A golf club head for golf, wherein the thickness of the portion is thicker than the portion corresponding to the upper surface . 2. The metal film layer is formed by plating, bonding and spraying.
Characterized by being formed by any one of the following means:
The golf wood club head according to claim 1.