JPH0566829B2 - - Google Patents

Description

[Detailed description of the invention]

[Object of the Invention] (Industrial Application Field) The present invention relates to a golf club head using beryllium copper alloy. (Prior Art) As for the performance of a golf club, it is desired that the golf club has greater flight distance and excellent directional stability. However, it has been found that if the club head is made of a material with higher hardness, it is possible to increase the flight distance. Club heads made of various materials are known for this purpose. For example, Utsukai Showa 59-
In JP-A No. 161851, an aluminum alloy containing 1% Ag and 4% Cu was used as the molding material for the club head, and in JP-A-60-782, the face part was made of zinc.
Zn, Aluminum Al, Nickel Ni, Silicon Si,
Tin Sn, manganese Mn, silver Ag, magnesium Mg
A β-brass type alloy containing one or more elements selected from the group including It is composed of an alloy. However, with conventional materials, when hardness is increased in order to increase flight distance, other mechanical properties such as elastic modulus and tensile strength deteriorate, and this strength problem makes it difficult to significantly increase flight distance. I couldn't do it. As a means of solving these problems, the same applicant proposed a golf club head using beryllium copper alloy, which has excellent not only strength but also elasticity, in Japanese Patent Application No. 60567/1982. (Problem to be solved by the invention) Beryllium copper alloy has superior elastic modulus and tensile strength compared to steel, but its performance cannot be effectively utilized with the same shape and structure as conventional heads. There was a problem. The present invention has been made based on the above-mentioned problems, and an object of the present invention is to provide a golf club head that effectively utilizes the performance of beryllium copper alloy. [Structure of the Invention] (Means for Solving the Problems) The first invention forms a head having a neck 5 obliquely provided on the heel 4 side of the face 3 from a beryllium copper alloy, and also forms a head with a beryllium copper alloy on the heel 4 side of the neck 5. is formed to have a smaller diameter than the center portion 5B of the neck 5. In the second invention, a balance weight 15 is fixed to the back surface of a head body 11 made of a beryllium copper alloy, in which a neck 14 is obliquely provided on a heel 13 of a face member 12 having a thinner wall. (Function) In the first invention, strong elasticity can be exerted by the lower end 5A of the neck 5 having a small diameter at the time of shot, and the flight distance can be extended. In the second invention, strong elasticity can be exerted by the thinned face member 12 at the time of shot, and flight distance can be extended. (Embodiment) Figures 1 to 3 show a first embodiment of the first invention, in which 1 is a head body, and this head body 1 contains 3% or less of beryllium as a solid solution in copper. A beryllium-copper alloy, which is a precipitation-hardening alloy made by adding small amounts of elements such as cobalt, nickel, and silver, is repeatedly forged within the elongation rate described below, and then heat-treated for hardening. A neck 5 is provided obliquely on one side of the face 3 on which the grooves 2 are formed, that is, on the heel 4, with an appropriate lie angle. The diameter A of the heel 4 side of the neck 5, that is, the lower end 5A of the neck 5 is the center part 5B of the neck 5.
A shaft 6 is connected to the neck 5. The following table shows the chemical composition of typical beryllium copper alloys.

[Table] 〓Unit %〓
The beryllium copper alloy is, for example, 2% at 800°C.
After the beryllium dissolves into the copper...at room temperature...
Only about 0.2% melts...If rapidly cooled from a high temperature, an α-phase structure containing supersaturated beryllium as a solid solution can be obtained by solution treatment. When naturally cooled after heating, supersaturated beryllium precipitates as a γ phase, an intermetallic compound of copper and beryllium, and becomes extremely hard due to the heat treatment. The following table shows the processing temperatures for solution treatment and hardening treatment.

【table】

[Table] The following table shows the mechanical properties of beryllium copper alloys and comparisons with other alloys.

[Table] Next, the operation of the above structure will be explained. During a shot, when a golf ball (not shown) hits the face 3 and an impact force is applied, the impact concentrates on the lower end 5A of the neck 5, causing distortion. When the golf ball leaves the golf ball, a strong repulsive force is generated by the restoring force of the lower end 5A, and the flight distance can be increased. As described above, by molding the entire head body 1 from beryllium copper alloy and hardening the face 3, the hitting surface of the golf ball can be made highly hard and the flight distance can be increased. Furthermore, by molding the head body 1 from a beryllium copper alloy, it can have high strength and an appropriate modulus of longitudinal elasticity, that is, excellent spring characteristics. As a result, a high contact pressure can be applied to the golf ball, and the initial velocity of the golf ball at the time of shot can be increased, making it possible to further extend the flight distance. Further, as the number of shots increases, the face 3 is subjected to repeated impacts, but since it has high fatigue resistance, it can maintain its original performance for a long period of time. In particular, since the lower end 5A of the net 5 is formed to have a smaller diameter than the central portion 5B, the impact force when the face 3 hits the golf ball is concentrated on the lower end 5A, causing distortion.
The restoring force of the lower end 5A, that is, the repulsive force due to the elasticity, allows the golf ball to be hit and the flight distance to be extended. At this time, the lower end 5 of the net 5
A exhibits high strength due to the characteristics of beryllium copper alloy and has no risk of bending. 4 and 5 show a second embodiment of the second invention, in which reference numeral 11 denotes a head body in which a neck 14 is provided obliquely at a predetermined lie angle on the heel 13 side of a plate-shaped face member 12. And this head body 11
consists of a beryllium-copper alloy. A balance weight 15 is fixed to the back surface of the face member 12 through a hollow part 16 having an open top, and is made of a metal with relatively high specific gravity such as beryllium copper alloy, lead, copper, etc. In order to adjust this, the sole 15A is formed into a predetermined shape, such as by making the part closer to the sole 15A larger. Face member 1 made of the beryllium copper alloy
2 is set to have a thickness T which is thinner than a conventional hollow iron head, for example, 2 to 4 mm, preferably approximately 3 mm. Next, the operation of the above structure will be explained. When a golf ball (not shown) hits the face 12A during a shot and an impact force is applied, the face member 12 is depressed by the impact force. Next, the recessed portion of the face member 12 is restored by the elasticity of the beryllium copper alloy, and when the golf ball is released, the strong restoring elasticity allows the golf ball to be shot. As described above, by using beryllium copper alloy for the face member 12, high hardness and strong tensile strength can be achieved, and the flight distance of the golf ball can be extended. Especially the face member 12
By reducing the thickness T to 2 to 4 mm, preferably approximately 3 mm, it is possible to increase the depression during shot, which means that the amount of elastic energy stored can be increased, and when the golf ball is released, it has a strong restoring force. You can demonstrate this and increase your flying distance. FIG. 6 shows another embodiment, and the same parts as in the second embodiment will be described with the same reference numerals. A balance weight 15 is fixed to the back surface of the thinned face member 12 via a sealed hollow part 16. It should be noted that the present invention is not limited to the above embodiments; for example, the first embodiment may have a hollow structure similar to the second embodiment, and the second embodiment may have a hollow structure filled with foamed resin. Various modifications are possible, such as filling. [Effects of the Invention] In the first invention, the face and the neck are molded from a beryllium copper alloy, and the lower end of the neck is formed to have a small diameter, so that the lower end of the neck can exhibit strong spring properties and increase flight distance. It can be stretched. In the second aspect of the invention, by thinning the face member made of beryllium copper alloy, the face member can exhibit strong springiness during shot, thereby increasing flight distance.

[Brief explanation of drawings]

Figures 1 to 3 show the first embodiment, where Figure 1 is a front view, Figure 2 is a perspective view, and Figure 3A is a perspective view.
1 is a sectional view taken along the - line in FIG. 1, FIG. 3B is a sectional view taken along the - line in FIG. 1, FIGS. 4 and 5 show the second embodiment, and FIG. Figure, 5th
The figure is a front view, and FIG. 6 is a partially cutaway perspective view of another embodiment. 1, 11...Head body, 3...Face,
5, 14...Net, 5A...Lower end, 5B...Hollow part, 12...Face member, 15...Balance weight, 16...Hollow part, T...Thickness.

Claims (1)

[Scope of Claims] 1. A golf club characterized in that a head body having a neck obliquely provided on one side of the face is formed of a beryllium copper alloy, and the lower end of the neck is formed to have a smaller diameter than the center of the neck. Head. 2. A head body with a diagonal neck on one side of a plate-shaped face member is formed of beryllium copper alloy,
A golf club head characterized in that a balance weight is fixed to the back surface of the face member via a hollow part, and the face member is formed thin. 3. The golf club head according to claim 1, wherein the face has a thickness of 2 to 4 mm.