JPH0443244Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to the improvement of the club head of a wood golf club, which is mainly made of fiber-reinforced plastic.
This invention relates to a golf club made of a composite material of syntactic foam and wood.

[Prior art]

The head of a golf club called a wood club has traditionally been manufactured using persimmon wood as its main material, but club heads made mainly of fiber-reinforced plastic have recently been developed and are becoming popular.
Since wood heads made of fiber-reinforced plastic are molded into the same size as club heads made of persimmon wood, which has a long history, the core material has to be made to match the weight of persimmon wood. A foamable synthetic resin with a light specific gravity was used as the material, and most of them were made of hard urethane foam. However, these foamable synthetic resins with low specific gravity, such as hard urethane foam, have low compressive strength and impact breaking strength, are easily destroyed under the harsh conditions of use as a wet golf club, and cannot withstand long-term use as a core material. It was hot.

Moreover, the hard urethane foam has poor strength and rebound resilience, and has problems with ball flight distance and feel when hit.

To improve this, low specific gravity and
A wood club head using a syntactic foam with high compressive strength as a core material has already been proposed by the applicant of the present application (Japanese Patent Laid-Open No. 68873/1983).

In addition, a sole plate made of metal or the like is attached to the sole part of the club head to prevent scratches and damage caused by hits, but wood club heads, which are mainly made of fiber-reinforced plastic, do not have a sole plate. When fixing to the head body, it is generally done by integral molding when the head is molded, or by using adhesive or wood screws. However, attaching and detaching the sole plate after forming the head is difficult compared to wood club heads made mainly of persimmon wood. It was difficult to adjust the weight by drilling a hole in the sole, embedding the desired weight, and then reattaching the sole plate.

The reason for this is that unlike wood, fiber-reinforced plastic is difficult to repeatedly tighten the wood screws that secure the sole plate. In addition, in the case of wooden club heads that are used under severe conditions, the fixation stability of the weights such as lead embedded in the wooden head body may also be affected.
Club heads made mainly of fiber-reinforced plastics are significantly inferior to those made of wood such as persimmon.

Therefore, a wood club head using wood as the core material has also been proposed (Japanese Patent Laid-Open No. 59-62068,
80269, 80270). However, in the case of this wood golf club as well, due to the high specific gravity of the wood, the club
The total weight of the head was high and therefore could not be a practical solution unless the head size was reduced or a lower specific gravity wood was used. However, in this case, the former approach would make the head smaller, giving the golfer a sense of discomfort and anxiety about hitting a ball incorrectly, while the latter approach would worsen the club's flight distance and feel at impact, and furthermore, the head would become smaller. It also caused a decrease in strength.

Furthermore, the above also applies to the case where a face insert made of a different material is attached for use with a thread-wound ball or for the purpose of improving bite into the head of a golf ball.

[Purpose of invention]

This invention was devised by focusing on the conventional problems, and its purpose is to make it easier to attach and detach sole plates, face inserts, and weights, and to improve product quality. The present invention provides a golf club that can be used for various purposes.

[Structure of the idea]

In order to achieve the above object, this invention integrates the core of the club head into a layered composite structure of syntactic foam and wood, and inserts the core made of this layered composite structure from the face side of the club head. The gist is that the sole plate is disposed in an area extending to the back side, and a sole plate is fixed to the wood portion of the core body.

[Example of idea]

Embodiments of this invention will be described below based on the accompanying drawings.

Figure 1 shows the first example of this invention applied to a wood club head 1 without face insert X.
This club head 1 is mainly composed of an outer shell 2 formed by compression molding or injection molding, and a core body 3 embedded in the outer shell 2. There is.

As shown in FIGS. 2 and 3, the core 3 is interposed between the main material, the syntactic foam 4, and its central portion, from the face 1a side to the back side 1b of the club head 1. It has a composite structure with a hard wood 5 such as persimmon wood, and the syntactic foam 4 and the wood 5 are firmly bonded together through an adhesive (not shown) such as an epoxy resin. It is joined.

The club head 1 is then produced by covering the core body 3 having the above-described structure with the outer shell 2 made of the fiber-reinforced plastic described above.

Further, the sole plate 6 attached to the bottom of the club head 1 is fixed to the wood portion 5 of the core body 3 with wood screws 7 or adhesive, as shown in FIG.

5 and 6 show another embodiment of the core body 3, in which the portion of the wood 5a that is bonded to the syntactic foam 4a is enlarged toward the heel side to form a composite structure.

Note that the other configurations are the same as those of the above embodiment, so explanations will be omitted.

Next, FIGS. 7 and 8 show a second embodiment in which a face insert X is attached to the club head 1. In the case of this second embodiment, the face insert A face insert X made of a different material is adhered to the outer shell 2 using an adhesive (not shown), or is fixed to the wood 5 of the core body 3 using wood screws (not shown).

In addition, when burying a weight W made of lead ingot or the like in the club head 1 for the purpose of adjusting the swing weight, etc., the sole plate 6 is removed and the wood 5 of the core 3 is buried as shown in FIG. After drilling a hole 8 with a drill or the like, embedding and fixing the weight W, the sole plate 6 is attached and fixed.

[Effect of idea]

This idea consists of integrally constructing the core of the club head into a layered composite structure of syntactic foam and wood, as described above, and moving the core made of this layered composite structure from the face side to the back side of the club head. Since the sole plate is fixed to the wooden part of the core body, the sole plate can be easily attached and detached, and the position of the weights and the weight balance can be freely and easily adjusted. Furthermore, when using the club head, the movement of the weight inside the club head and the occurrence of rattling are reduced compared to conventional wood club heads that are mainly made of fiber-reinforced plastic, which greatly improves the stability of the weight position and noise. This had the effect of allowing players to improve their feel at bat and the flight distance of the ball.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a club head showing a first embodiment of this invention, Fig. 2 is a front view of the core shown in Fig. 1,
Figure 3 is a plan view of Figure 2, Figure 4 is a - of Figure 1.
5 is a front view showing another embodiment of the core, FIG. 6 is a plan view of FIG. 5, and FIG. 7 is a second embodiment of this invention in which a face insert is attached to the club head. A perspective view showing an example, FIG.
FIG. 9 is a cross-sectional view taken along the - line in the figure, and FIG. 9 is a cross-sectional view showing another embodiment in which a weight is attached to the club head. 1...Club head, 1a...Face side, 1
b... Back side, 3... Core body, 4... Syntactic foam, 5... Wood.

Claims (1)

[Claims for Utility Model Registration] (1) In a golf club having a club head mainly made of fiber-reinforced plastic, the core of the club head is integrally formed into a layered composite structure of syntactic foam and wood. A golf club characterized in that a core made of this layered composite structure is disposed in a region from the face side to the back side of the club head, and a sole plate is fixed to the wood portion of the core. (2) A golf golf ball according to claim 1, wherein a hole is bored in the wood portion of the core made of the layered composite structure, and a weight is fixed to the hole.
club.