JPH11178955A - Wood club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a long distance for a hit golf ball with directional stability by integrally assembling a hollow head main body with a cut-off at a prescribed range and a weight which is formed into a shape with the prescribed range and has weight heavier than that of the prescribed range so that the head main body and the weight are in a continuous outer shape. SOLUTION: This head 1 is divided by a joint faces 2, 3 of a vertical section a prescribed distance away in the swing direction from the rear end of the back face to make the front half a head main body 4 and the rear half a weight 5. Because almost symmetrical dents 6, 6 are formed in the outer shape to reduce the air resistance in a swing and disperse the weight to toe and heel parts, the outer shapes of both 4, 5 are made continuous. The head main body is usually hollow and adjusted so that the weight as the head 1 added by the weight 5 is to be around 200 g. Thus the weight 5 is positioned on the most rear part away from the head center to make the moment of inertia and the depth of center of gravity larger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structural improvement for increasing the moment of inertia and the depth of the center of gravity of a wood head of a golf club.

[0002]

2. Description of the Related Art Wood heads (hereinafter abbreviated as "heads") of golf clubs are required to sharpen the direction of a hit ball and extend the flight distance. Techniques for increasing the depth of the center of gravity are widely known. In recent years, metal heads that have become common have become hollow due to weight restrictions, and cannot simply be processed to attach a weight. In particular, for a titanium (Ti) head which is difficult to machine, a heavy object (for example, copper or brass) is attached to the back face of the substantially flat sole which is easy to machine as much as possible.

[0003]

In order to increase the rotational moment and the depth of the center of gravity of the head, it is necessary to attach a heavy object as far as possible from the center of the head. But,
As can be seen from the above, with metal heads that are frequently used in recent years, there is no choice but to attach heavy objects to the sole and to keep the heavy objects away from the center of the head due to processing problems. Therefore, an attempt was made to develop a head having a new structure, mainly aiming at increasing the moment of inertia and the distance of the center of gravity of the metal head.

[0004]

SUMMARY OF THE INVENTION What has been developed is a hollow head body having a structure in which a predetermined range including a back face is cut out, and a hollow head body having the same shape as the predetermined range and being heavier than the weight of the predetermined range. And a wood head in which the head body and the weight are integrally assembled so that their outer shapes are continuous. The weight being heavier than the notched predetermined range means that the weight is heavier than a predetermined range of virtual weight that can be configured by extending the head main body, and is determined from the apparent density in the predetermined range having the same configuration as the head main body. It is equivalent to the apparent density of the weight having the same shape as the range being large. It does not necessarily mean that the specific gravity of the material forming the weight is heavier than the specific gravity of the material of the head body.For example, a solid weight even at a low specific gravity is heavier than a hollow predetermined range made of a material having a high specific gravity. In some cases.

The present invention relates to a head composed of two members, a head body and a weight. The head can be moved most from the center of the head without performing complicated processing (excluding formation of screw holes for assembling) on the head body. Allows weight to be attached to a distant back face. As a result, the moment of inertia and the depth of the center of gravity can be further increased than when a heavy object is attached to the sole. As a specific example, a combination of attaching a solid or hollow weight made of copper, brass or tungsten to a head body having a hollow structure made of titanium (including a titanium alloy) or carbon can be cited.

[0006] The head body and the weight are integrated with the joint surface interposed therebetween. This joint surface is a vertical section (plane) assumed at a fixed distance in the swing direction from the rear edge of the back face
And may be a three-dimensional curved surface. The front body is the head body and the rear body is the weight from the joint surface. It is preferable that the head body and the weight are assembled together with a screw and an adhesive for preventing the screws from loosening.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a wood head according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the head 1 of the present invention as viewed from the back face side, and FIG. 2 is a side view of the assembling relationship of the head 1 as viewed from the heel side. As shown in FIG. 1, the head 1 of this example is divided at the joining surfaces 2 and 3 which are vertical cross sections at a certain distance in the swing direction from the rear edge of the back face, and the front body is a head body 4 and the rear body is a The weight is set to 5. In order to reduce the air resistance of the swing and to disperse the weight to the toe and heel sides on the outer shape, the substantially symmetrical recesses 6, 6 provided on the crown are formed from the head body 4 to the weight 5, It can be seen that the outer shapes of the two 4 and 5 are continuous.

[0008] As shown in FIG.
It is usually hollow and adjusted so that the weight of the head 1 including the weight 5 is about 200 g. For this reason, if the weight is directly attached to the head main body as in the related art, a sole that is easy to process and has excellent attachment stability must be selected as the attachment position. In the present invention, the head body 4 has an appearance in which the back face is cut out in a predetermined range.
Then, by attaching the weight 5 similar to the cut shape, the addition of a heavy object to the head 1 was facilitated. The weight 5 attached to the stroke including the back face in this manner is naturally located at the rearmost position from the center of the head, and it can be seen that the moment of inertia and the depth of the center of gravity increase from the structural point of view.

[0009] Screw holes 7 are formed in the joint surface 2 of the head main body 4, and the weights 5 are tightened by screws 8, so that the weights 5 can be assembled to the head main body 4. The number and size of the screws are free, but for the purpose of preventing the screws 8 from loosening over time and stabilizing the assembling relationship, an adhesive is applied to the joint surfaces 2 and 3 so that the screws 8 Assembly by combined use is preferred. Also, the head body 4 and the weight 5 only need to be assembled so that their outer shapes are continuous.
The joining surfaces 2 and 3 may be three-dimensional curved surfaces. For example, as shown in FIG. 3, even when the head body 4 having the joint surfaces 2, 3 having the convex curved surfaces and the weight 5 are assembled, as shown in FIG. 4, the joint surfaces 2, 3 having the concave curved surfaces are formed. The head main body 4 and the weight 5 may be assembled.

In addition, an assembling method other than screwing may be used so that the assembling means cannot be seen from the external appearance. FIG. 5 is a side view of the assembling relationship of the head 1 assembled by fitting the concave portion 9 and the convex portion 10 as viewed from the heel side. In advance, the head body 4 is formed with a thick crown or sole to form a concave portion 9 in the joint surface 2, and the concave portion 9 is formed in the joint surface 3 of the weight 5.
Are formed in advance. And the joining surface 2,
The protrusions 10 are fitted into the recesses 9 so that the heads 3 are in close contact with each other, and the head body 4 is combined with the weights 5 to strike and extend the crown or the sole. We will achieve close assembly and realize a stable assembly relationship. In this assembling method, since the assembling means (the concave portion 9 and the convex portion 10) are not visually recognized from the outside, the appearance is neat.

[0011]

EXAMPLE Next, for the purpose of confirming the improvement of the performance of the wood head of the present invention, a head equivalent to FIG. Select the No. 1 wood (280 Ti, face thickness 3.00 mm) as the test piece, and use a head with a 170 g titanium head body and a 20 g brass weight attached as an example based on the test piece, and leave the test piece as it is. It was used as a conventional example. Table 1 shows specifications of the embodiment and the conventional example.

[0012]

[Table 1]

In Table 1, the embodiment has a moment of inertia Ig (moment of inertia around the center of gravity of the head) left and right, Ig up and down, and Is (moment of inertia around the shaft axis) in comparison with the conventional example.
Has improved by more than 10%, and the depth of the center of gravity has receded by more than 10%.
In particular, the upper and lower Igs are remarkably improved to 25% or more.
From these facts, it is expected that the ball is less shaken at the time of impact and the flight distance at the time of a test hit is improved, that is, the BS (initial speed of the ball immediately after the impact) and the impact loft (the actual loft angle at the moment of impact) are improved.
Next, Table 2 shows the average values of the test hits obtained by swinging five times for each of the examples and the conventional example. In addition, impact loft and BE in each embodiment are real loft
(See Table 1) taking into account the difference between the conventional examples.

[0014]

[Table 2]

In the embodiment, the BS (ball speed) and the meat ratio (BS / HS) are not so different from the conventional example, but the impact troft shows an improvement of 15% or more.
(Ball angle) is also nearly 20% higher. This means that the ball flies higher, and it is expected that the flight distance will be increased accordingly. Thus, the degree of improvement shown numerically can be remarkable. In other words, it was confirmed that if the head shape and the weight were the same, the increase in the flight distance was such that it could be clearly felt. Since the improvement in the flight distance and the directionality of the hit ball can be applied irrespective of the material or shape of the head, the present invention has the effects of increasing the flight distance of the conventional head and stabilizing the directionality of the hit ball. I can say.

[0016]

The present invention increases the moment of inertia and the depth of the center of gravity of a wood head. A large moment of inertia reduces head shake during impact, and a large depth of center of gravity increases the sweet spot, increasing the impact loft and increasing the launch angle of the ball.
As a result, a long-distance hit ball having stable directionality can be obtained. Thus, the present invention has achieved the provision of a woodhead that "flyes accurately to a distance."

[Brief description of the drawings]

FIG. 1 is a perspective view of a wood head of the present invention as viewed from a back face side.

FIG. 2 is a side view of the assembling relationship of the wood head as viewed from a heel side.

FIG. 3 is a side view of the assembling relationship of another example wood head as viewed from the heel side.

FIG. 4 is a side view of the assembling relationship of another example wood head as viewed from the heel side.

FIG. 5 is a side view of the assembling relationship of the wood head assembled by fitting the concave portion and the convex portion as viewed from the heel side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wood head 2 Head side joining surface 3 Weight side joining surface 4 Metal head body 5 Brass weight 6 Depression 7 Screw hole 8 Screw 9 Depression 10 Convex part

Claims (1)

[Claims] 1. A hollow head main body having a structure in which a predetermined area including a back face is cut out, and a weight formed to have the same shape as the predetermined area and to be heavier than the predetermined area. A wood head in which weights are integrally assembled so that the outer shape is continuous.