JPH0436844Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an iron golf club head, and more specifically, it provides a soft hitting feeling and better control of the ball when shooting a ball, and improves the accumulation of repulsion energy. This invention relates to an iron golf club head.

[Conventional technology]

Generally, iron club heads are integrally molded from metals such as brass or stainless steel, but although these types of club heads have shapes and weights tailored to each club club, they are made of a lump of metal, so they do not have elasticity. If the elasticity of the ball hitting surface, which is the most important for hitting the ball, is low, the coefficient of restitution will be small, and it will not be possible to obtain the soft hitting feel of a wood club, nor will the ball flight distance be obtained.

[The problem that the idea attempts to solve]

Therefore, conventional iron golf clubs have been proposed in which a reinforcing synthetic resin layer mixed with carbon fiber or glass fiber is formed on the surface of the head body, including the ball-striking surface, thereby improving the repulsive force of the ball-striking surface. , the first of its kind was published in 1983.
It is disclosed in Publication No. 16670.

The iron golf club head of this type is
In order to securely hold the reinforced synthetic resin layer formed on the head body, a large number of holes are formed in the metal core material that penetrate from the face side to the back side. The formed reinforced synthetic resin layers are connected to each other by the same synthetic resin material inserted into the hole.

However, if a large number of through holes are formed in the metal core material, the impact stress in the reinforced synthetic resin layer caused by the impact force when the ball is hit on the ball hitting surface of the head body is absorbed by the connections filled in the through holes. It propagates through the synthetic resin material and is absorbed into the reinforced synthetic resin layer on the back side. In other words, the repulsive energy caused by the impact force is attenuated and no longer accumulates on the face, and as a result, the repulsive force against the ball decreases, making it impossible to improve the flight distance of the ball, and as the number of times the ball is hit increases. There was a problem that a crack occurred.

This invention was developed to solve the above-mentioned conventional problems, and it ensures strong adhesion of the reinforced synthetic resin layer to the head body, prevents cracks, and improves the repulsive force of the head face surface. let me,
To provide an iron golf club head designed to increase flying distance.

[Means to solve the problem]

In order to achieve the above object, the iron golf club head of the present invention includes a metal head having a core, a sole integrally formed at the lower part of the core, and a hosel integrally formed at the heel side of the core. A plurality of uneven portions are formed on the face surface of the metal head body, and at least the face surface of the metal head body is provided with a synthetic resin layer reinforced with non-directional short fibers on the inside and reinforced with woven fabric on the outside. A face portion serving as a synthetic resin layer is formed, and the non-directional short fiber synthetic resin layer is bonded to the recessed portion of the face surface of the metal head body.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

1 and 2 show an example of an iron golf club head according to the present invention. In the figure, reference numeral 1 denotes a head body integrally formed from a metal material such as stainless steel or brass, which includes a core 2 that is inclined rearward at a desired angle with respect to the vertical line, and a head body integrally formed at the center of the lower end of this core 2. It consists of a sole part 3 formed and a hosel 4 integrally formed diagonally upward on the heel part 2a of the core part 2, and a large number of circular recesses 5 are formed in the face surface 2b of the core part 2. has been done.

The metal surfaces of the head body 1 other than the lower surface of the sole portion 3, that is, the outer surfaces of the core portion 2 and the hosel 4, are covered with non-directional short fibers mixed with reinforcing short fibers such as carbon fibers and glass fibers at a predetermined ratio. The fiber-reinforced synthetic resin layer 6 is formed to a desired thickness according to each part, and the outer surface of the non-directional short fiber-reinforced synthetic resin layer 6 is coated with a synthetic resin material on a woven fabric made of carbon fiber, glass fiber, etc. A woven fabric reinforced synthetic resin layer 7 formed by impregnating and solidifying is covered and formed to a predetermined thickness.

The reinforcing short fibers have a length of about 10 mm to 30 mm, the synthetic resin material used is vinyl ester, epoxy, polycarbonate, etc., and each synthetic resin layer is molded using a head mold. It is something that

In the iron golf club head constructed as described above, the non-directional short fiber reinforced synthetic resin layer 6a of the head face portion A corresponding to the ball hitting surface enters into the face surface 2b of the core portion 2 and the recess 5. Since the bonding area is expanded by the recess 5, the bonding strength of the non-directional short fiber reinforced synthetic resin layer 6a increases, and the non-directional short fiber reinforced synthetic resin layer 6a peels off from the face surface 2b. There's nothing to do. Furthermore, the non-directional short fiber-reinforced synthetic resin and the woven fabric-reinforced synthetic resin can be firmly bonded, and the entire non-directional short fiber-reinforced synthetic resin layer 6 is covered with the woven fabric-reinforced synthetic resin layer 7. The entire head body 1 except for the part is made of an integrated woven fabric reinforced synthetic resin layer 7.
, the adhesion of the non-directional short fiber reinforced synthetic resin layer 6 becomes even more reliable.

Further, the head face part A is composed of two layers, a non-directional short fiber reinforced synthetic resin layer 6a and a woven fabric reinforced synthetic resin layer 7, and the core part 2 facing the head face part A has a structure without through holes. Because there are
The impact force at the time of hitting the ball does not propagate to the back side and dissipate, and the non-directional short fiber reinforced synthetic resin layer 6a of the ball hitting portion
is partially compressed between the woven fabric reinforced synthetic resin layer 7 and the core 2, that is, the impact stress is partially accumulated and becomes repulsive energy to the ball. Tensile stress is generated not only in the ball-hitting part but also in the entire head face part A like a gut, and the repulsion force due to this tensile stress and the accumulated repulsion energy of the non-directional short fiber reinforced synthetic resin layer 6a hit the ball with a delay from the time of ball-hitting. act. In other words, the impact energy when hitting a ball is 2
Due to the combination of layers and the core, this energy is synergistically accumulated in the head face section A, and this energy is imparted to the ball the moment the ball leaves the ball hitting surface, thereby increasing the flight distance of the ball and at the same time creating a soft hitting ball. To give a feeling to a golfer and make it easier to control the ball.

Further, by covering the outer surface with the woven fabric reinforced synthetic resin layer 7, the color design of the golf club head can be expanded, and the design effect of the golf club head can be improved.

In addition, in the above embodiment, the face surface 2b of the core portion 2
Although the recess 5 formed in the recess 5 is circular, it may be rectangular, triangular, honeycomb-shaped, or the like, and it goes without saying that the recess 5 may be replaced by a dovetail groove 8 as shown in FIG. Further, in the above embodiment, a method was described in which the front surface of the head body 1 except the sole portion 3 is covered with the non-directional short fiber reinforced synthetic resin layer 6 and the woven fabric reinforced synthetic resin layer 7. Alternatively, only the non-directional short fiber reinforced synthetic resin layer 6 and the woven fabric reinforced synthetic resin layer 7 may be formed.

[Effect of idea]

As explained above, according to the present invention, the face surface of the metal head body is formed into an uneven shape, and at least the face surface of the metal head body has a non-directional short fiber reinforced synthetic resin layer on the inside and a woven fabric reinforced synthetic resin layer on the outside. It forms a resin layer. Therefore, since the ball hitting surface is formed of a woven fabric reinforced synthetic resin layer, damage such as cracks can be prevented. Furthermore, when attaching this woven fabric reinforced synthetic resin layer to the face surface of the metal head body, a non-directional short fiber reinforced synthetic resin layer was interposed between the two, so that this non-directional short fiber reinforced synthetic resin layer was attached to the face surface of the metal head body. It can fully penetrate between the uneven parts of the metal head and bond with it, and it can also be bonded well with the woven fabric reinforced synthetic resin, so it plays the role of holding the woven fabric reinforced synthetic resin layer on the metal head body. Even if a woven fabric reinforced synthetic resin layer is attached to it, it will not peel off.

In addition, since the face surface of the core part has irregularities in order to attach the above-mentioned face part, the impact when the ball is hit bounces back without passing through to the back side and dissipating. Sufficient repulsion energy can be expected from the resin layer. In addition, in the woven fabric reinforced synthetic resin layer, tensile stress is generated not only in the ball hitting area but also in the entire face area, so the repulsive energy from the entire non-directional short fiber reinforced synthetic resin layer can be efficiently transmitted to the ball. The flight distance and directionality of the ball can be improved.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing an example of an iron golf club head according to the present invention. FIG. 2 is a sectional view taken along the - line in FIG. 1. FIG. 3 is a sectional view of a head body showing another embodiment of the present invention. 1... Head body, 2... Core, 2b... Face, 3... Sole, 4... Hosel, 5...
...Concave portion, 6...Non-directional short fiber reinforced synthetic resin layer, 7
...Woven fabric reinforced synthetic resin layer.

Claims (1)

[Scope of utility model registration request] The metal head body has a core portion, a sole portion integrally formed at the lower part of the core portion, and a hosel integrally formed on the heel side of the core portion, and a plurality of uneven portions on the face surface of the metal head body. At the same time, a face portion is formed on at least the face surface of the metal head main body, the face part having a non-directional short fiber reinforced synthetic resin layer on the inside and a woven fabric reinforced synthetic resin layer on the outside, An iron golf club head characterized in that the resin layer is bonded to a concave portion of the face surface of the metal head body.