JP2527046B2 - Wood club head for golf - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a golf wood club head including a head shell mainly composed of fiber reinforced plastics (hereinafter abbreviated as FRP).

[Prior Art] Conventionally, a golf club head for golf of this type has a homogeneous and continuous solid structure, such as a wood club made of wood made of persimmon or the like,
Like a metal or FRP wood club, it has an outer shell structure with a hollow or core filled with a soft material such as foam.

In such a conventional wood club head, the head body has a face surface (front surface facing the hitting direction: hitting surface), sole surface (bottom surface), back surface (rear surface facing the hitting direction), crown surface. (Upper surface), toe side surface (front surface facing orthogonally to the ball striking direction) and heel side surface (rear surface facing orthogonal to the ball striking direction) are integrally formed continuously, and in particular, the face surface is predetermined according to the count. In order to have a loft angle of 1 and to enhance the directionality due to the spin effect on the ball when hitting, a plurality of horizontal kerfs are usually provided.

Further, for the purpose of enhancing the repulsive force against the ball when hitting the ball, there is also a structure in which a hitting plate is attached separately to the sweet spot (hitting point) portion of the face surface.

[Problems to be Solved by the Invention] However, in the structure of the conventional wood club head described above, since the face surface is set to a unique loft angle according to the count, the larger the loft angle, the more the ball flies. While the favorable hitting angle is increased to extend the distance, the backspin on the ball is also increased and the run (rolling) is reduced, which has an adverse effect on the extension of the flight distance of the ball, and in particular, it receives a headwind. As a result, the ball tends to fly up greatly, which makes it impossible to expect a sufficient flight distance of the ball having a loft angle according to the count.

[Object of the Invention] An object of the present invention is to provide a golf wood club head capable of increasing the flight distance of a ball even if the loft angle of the face surface is fixed.

[Means for Achieving the Object] In order to achieve the above object, the present invention has an outer shell structure in which at least a face surface and a sole surface of a head body are made of FRP, and a crown surface thereof is made of a thin sheet metal. It is configured to be formed.

In this case, the forming position of the thin plate metal is basically the crown surface, but it is continuously extended to the side surface of the toe or integrally formed continuously with the hosel part to which the shaft is attached, or the toe side is formed. The effect of the present invention can also be obtained by continuously extending and integrally forming the side surface and the hosel portion.

[Configuration of the Invention] The configuration of the present invention will be described below with reference to the drawings.

As shown in FIG. 3, reference numeral 1 in the figure denotes a head main body of a golf wood club according to the present invention.

The head body 1 includes a face surface 2, a back surface 3, a sole surface 4, a crown surface 5, a toe side surface 6, a heel side surface 7 and a hosel portion 8 to which the shaft S is attached. Other surface except 3,5,
Reference numerals 6 and 7 have a curved surface with a large curvature, and the hosel portion 8 has a substantially cylindrical shape.

As shown in FIGS. 1 and 2, the head body 1 includes the face surface 2 other than the crown surface 5, the back surface 3, the sole surface 4, the toe side surface 6, the heel side surface 7, and the hosel portion 8. However, the core made of FRP 11 is hollow or has an outer shell structure filled with a soft material 12 such as foamed synthetic resin as shown in the figure, while the crown surface 5 is made of a thin sheet metal 13.

That is, the FRP 1 that constitutes the main body of the head body 1
1 has a relatively low specific gravity and high rigidity. For example, as the woven or knitted form of the reinforcing fibers, any one or more of roving, plain weave cloth, twill weave cloth, bias cloth, etc. may be used in combination. As the kind of the fiber material, fibers such as carbon, glass, silica, boron and aramid are used alone or in combination of two or more kinds, and further, these fibers are impregnated with a synthetic material for matrix. As the resin, an epoxy resin, an unsaturated polyester resin, an epoxy acrylate resin, or the like is preferably used, and the thickness thereof is different on each surface,
It is set in the range of ~ 12mm.

On the other hand, the thin plate metal 13 forming the crown surface 5 of the head body 1 is preferably made of a material such as stainless steel or brass, which has high pressure resistance, is easily bent and elastically deformed, and has fatigue resistance. The radius of curvature R is 90 mm ≧ R
The form is ≧ 60 mm and the thickness is in the range of 0.5 to 1.5 mm.

[Action] Next, the action due to the behavior of the golf club head of the present invention having the above-described configuration at the time of hitting a ball will be described in detail with reference to FIGS. 4 and 5.

When the ball B is hit with the golf club having the head structure according to the present invention, the initial hitting angle becomes large as shown by the solid line in FIG. 4, but an ideal large trajectory trajectory with less soaring is obtained. As a result, the flight distance of the ball B can be greatly extended, and after the ball B has dropped onto the ground G, the back spin of the ball B is small, so that a large run can be obtained. In addition,
The dotted line shown in FIG. 4 shows the trajectory of the trajectory of the head having the conventional structure.

Such behavior of the ball B is understood by the measurement result of how the backspin is applied to the ball B at the time of hitting, which will be described below.

That is, first, several lines as marks are drawn on the peripheral surface of the ball B like the longitude line of the globe so that the rotating state of the ball B can be identified.

Immediately after the ball B starts flying due to the impact of the club head, the ball B is photographed at the time of hitting, while illuminating the ball B with a strobe that continuously and instantaneously emits light at a time interval of 2 milliseconds. The rotational speed of the ball can be quantitatively measured.

According to such measurement results, the rotation angle of the ball B during the flight distance of 200 mm immediately after leaving the face surface 2 of the head body 1 is 29.0 ° in the conventional head made entirely of wood. However, in the head of the present invention, it was reduced to 21.5 °. The rotation direction of the ball B in this case is a state in which the moving speed of the lower surface of the ball B is higher than the moving speed of the upper surface of the ball B, which is so-called “backspin”. is there.

By the way, although the behavior of the golf club head according to the present invention at the time of hitting a ball has not been fully clarified, it is presumed that the behavior as shown in FIG. 5 occurs.

FIGS. 5 (a) and 5 (b) show the behavior at the time of impact. When the ball B is hit on the face surface 2, the crown surface 5 moves upward as shown by the two-dot broken line in FIG. 5 (a). The face surface 2 is bent and elastically deformed, and the face surface 2 is rotated about the bottom point a as a fulcrum so as to be tilted backward, and the original fixed loft angle θ ₀ is increased (θ + θ ₀ ), Elastic energy is stored.

In this state, when the ball B separates from the face surface 2 when it separates from the face surface 2, as shown in FIG. 5B, the face surface 2 moves forward with the bottom point a as a fulcrum due to the accumulated elastic energy. It elastically rotates so as to restore toward, and by the rotation of the elastic face surface 2 by the restoring force, the degree of backspin on the ball B is suppressed, and as a result,
It is assumed that an ideal trajectory trajectory as shown in FIG. 4 can be obtained.

[Examples] As another example of the present invention, the thin sheet metal 13 forming the crown surface 5 of the head body 1 is continuously extended to the toe side surface 6 continuously or integrally with the hosel portion 8. Even if it is integrally formed or continuously extended to the toe side face 6 and the hosel portion 8 integrally, the action and effect of the present invention can be sufficiently exhibited.

[Effects of the Invention] As is apparent from the above description, according to the present invention, the crown surface of the head main body mainly composed of the FRP outer shell structure is formed of thin sheet metal, and the face surface is rotated backward by the impact at the time of hitting the ball. Therefore, the elastic energy can be accumulated on the face surface, the loft angle of the face surface is increased, and the restoring force of the elastic energy of the face surface causes the face surface to move forward when the ball is separated. Since the ball can be turned to, it is possible to obtain an ideal large trajectory trajectory with a large initial hitting angle and a small amount of soaring, which can greatly extend the flight distance of the ball.

Also, because the backspin of the ball is small, you can get a big run after falling to the ground.
A wood club head for golf having excellent effects can be provided.

[Brief description of drawings]

1 is a sectional view showing an embodiment of a golf wood club head according to the present invention, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is an external perspective view of the same head body. FIG. 4 is an explanatory view showing the trajectory of the ball at the time of hitting the ball in comparison with a conventional ball, and FIGS. 5 (a) and (b) are explanatory views showing the behavior of the club head at the time of hitting the ball. 1 ... Head body, 2 ... Face surface, 3 ... Back surface, 4 ... Sole surface, 5 ... Crown surface, 6 ... Toe side surface, 7 ... Heel side surface, 8 ... Hosel part, 11 ... … FRP, 13… Sheet metal.

Claims (4)

(57) [Claims] 1. A wood club head for golf, characterized in that at least a face surface and a sole surface of a head main body have an outer shell structure made of FRP, and a crown surface thereof is formed of a thin sheet metal. 2. A wood club head for golf according to claim 1, wherein the thin sheet metal forming the crown surface is continuously and integrally extended to the toe side surface of the head body. 3. The golf club head for golf according to claim 1, wherein the thin sheet metal forming the crown surface is formed continuously and integrally with the hosel portion of the head body. 4. A thin sheet metal forming a crown surface is continuously and integrally extended to a toe side surface of a head main body, and is continuously and integrally formed with a hosel portion.
The described wood club head for golf.