JPH0639058A - Coupling method for golf club head and shaft - Google Patents

Abstract

PURPOSE:To provide the method for coupling efficiently and firmly a golf club head and a shaft in a short time. CONSTITUTION:To the tip part 7 of a shaft 2, a metallic sheet 6 which is heated by electric conduction, and also, melted by its heat is wound round, and subsequently, this shaft tip part 7 is inserted into a shaft fitting hole 5 of a golf club head 1, a current is allowed to flow to the metallic sheet 6 by a power source 8, and by heating and melting it, the golf head 1 and the shaft 2 are fixed integrally.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting a golf club head and a shaft by inserting the tip of the shaft into a shaft fitting hole of the golf club head and fixing them together.

[0002]

2. Description of the Related Art When a golf club is manufactured, when a shaft and a golf club head are joined together, an adhesive is conventionally injected into a shaft fitting hole of the golf club head, and then the tip of the shaft is injected with the adhesive. The golf club head and the shaft were integrally connected by being inserted into the shaft fitting hole. An epoxy resin is generally used as such an adhesive.

However, in order to spontaneously cure the epoxy resin to such an extent that it does not affect the processing in the next step, it is usually 2
Since it takes about 0 to 30 minutes, it takes a great amount of time to complete the work of connecting the golf club head and the shaft, which inevitably deteriorates the work efficiency.

When the tip of the shaft is inserted into the shaft fitting hole of the golf club head into which the epoxy resin has been injected, the epoxy resin may slightly overflow from the fitting hole. After curing, this may remain as “burr”, which may deteriorate the quality of the golf club.

Further, the epoxy resin as an adhesive is a two-liquid mixing type, and the two liquids are mixed into the shaft fitting hole and then injected in the factory production line. When the nozzle for injecting into the nozzle was clogged, the work had to be interrupted, and the production line itself had to be stopped in some cases.

Further, unless the work is advanced while periodically checking the mixed state of the two liquids of the epoxy resin to be injected into the shaft fitting hole, the adhesive force may be reduced, resulting in a problem that the work efficiency is reduced. I could not escape.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of connecting a golf club head and a shaft, which has higher work efficiency than ever before.

[0008]

In order to achieve the above object, the present invention provides a method for connecting a golf club head and a shaft, wherein a tip end portion of the shaft is inserted into a shaft fitting hole of the golf club head and the two are fixed. , A metal that is melted by heat is interposed between the shaft fitting hole and the tip of the shaft, the two are fitted together, the metal is heated to melt it, and then the metal is cooled and hardened to cool the golf club. We propose a method for connecting a golf club head and a shaft, in which the head and the shaft are integrally fixed.

Further, according to the present invention, there is provided a method for connecting a golf club head and a shaft, wherein the tip of the shaft is inserted into the shaft fitting hole of the golf club head so as to fix them together. A sheet-shaped metal that melts with heat is wrapped around the outer peripheral surface of the tip, and in that state the tip of the shaft is inserted into the shaft fitting hole of the golf club head, and then the sheet-shaped metal is heated to melt it. Then, a method of connecting the golf club head and the shaft is proposed in which the golf club head and the shaft are integrally fixed by cooling and hardening the same.

The present invention also provides a method for connecting a golf club head and a shaft, wherein the tip of the shaft is inserted into the shaft fitting hole of the golf club head and the two are fixed together.
A sheet-shaped metal that is melted by heat is fixed to at least one of the inner peripheral surface of the shaft fitting hole and the outer peripheral surface of the shaft tip portion before they are fitted to each other. A method for connecting a golf club head and a shaft is proposed in which the sheet-shaped metal is inserted into a fitting hole, and then the sheet-shaped metal is heated to melt the metal, and then the metal is cooled and hardened to integrally fix the golf club head and the shaft. .

Further, according to the present invention, in a method of connecting a golf club head and a shaft, wherein a tip portion of a shaft is inserted into a shaft fitting hole of a golf club head so as to fix the both, a shaft fitting hole before being fitted to each other. At least one of the inner peripheral surface and the outer peripheral surface of the shaft tip portion was adhered with heat-melting particulate metal, and in that state, the shaft tip portion was inserted into the shaft fitting hole of the golf club head, and then adhered. A method of joining a golf club head and a shaft is proposed, in which a particulate metal is heated to melt it, and then this is cooled and hardened to fix the golf club head and the shaft together.

Further, according to the present invention, in a method of connecting a golf club head and a shaft, wherein the tip of the shaft is inserted into the shaft fitting hole of the golf club head to fix the two together, the shaft fitting hole before being fitted to each other. At least one of the inner peripheral surface and the outer peripheral surface of the shaft tip portion is coated with a heat-melting metal in a hardened state, and in that state, the shaft tip portion is inserted into the shaft fitting hole of the golf club head. A method of joining a golf club head and a shaft is proposed, in which the coated metal is heated to melt it, and then this is cooled and hardened to fix the golf club head and the shaft together.

At this time, a sheet-shaped metal which is melted by heat is attached to at least one of the inner peripheral surface of the shaft fitting hole and the outer peripheral surface of the shaft tip portion before they are fitted to each other, and then this is heated and melted. Then, by cooling and hardening the same again, at least one of the inner peripheral surface of the shaft fitting hole and the outer peripheral surface of the shaft tip portion before fitting with each other can be coated with a metal that melts by heat.

Further, heat-melting particulate metal is adhered to at least one of the inner peripheral surface of the shaft fitting hole and the outer peripheral surface of the shaft tip portion before they are fitted to each other, and then heated to melt. Then, by cooling and hardening the same again, at least one of the inner peripheral surface of the shaft fitting hole and the outer peripheral surface of the shaft tip portion before fitting with each other can be coated with a metal melted by heat.

Further, at least one of the inner peripheral surface of the shaft fitting hole and the outer peripheral surface of the shaft tip portion before fitting with each other may be coated with a metal that melts by heat by plating.

Further, according to the present invention, in a method of connecting a golf club head and a shaft, wherein the tip of the shaft is inserted into the shaft fitting hole of the golf club head to fix them together, the shaft fitting hole before being fitted to each other is provided. Metal layers are integrally fixed to the inner peripheral surface and the outer peripheral surface of the tip of the shaft, and at least one of these metal layers is coated with a heat-melting metal in a cured state, and in that state the shaft A golf club head in which a tip portion is inserted into a shaft fitting hole of a golf club head, the coated metal is heated to melt the metal, and the metal is subsequently cooled and hardened to integrally fix the golf club head and the shaft. A method of connecting shafts is proposed.

At this time, at least one surface of each of the metal layers is adhered to at least one surface of the both metal layers by melting, and then melted and then cooled and hardened again so that at least both of the metal layers are melted. One surface can be coated with a heat-melting metal.

It is also possible to coat at least one surface of both metal layers with a metal that is melted by heat by plating.

The present invention also provides a method of connecting a golf club head and a shaft, wherein the tip of the shaft is inserted into a shaft fitting hole of the golf club head and the two are fixed together.
Metal layers are integrally fixed to the inner peripheral surface of the shaft fitting hole and the outer peripheral surface of the shaft tip before they are fitted to each other, and the outer peripheral surface of the metal layer fixed to the shaft tip is melted by heat. Wrap a sheet metal, insert the shaft tip into the shaft fitting hole of the golf club head in that state,
Next, the sheet metal is heated to melt it,
Then, a method of connecting the golf club head and the shaft is proposed in which the golf club head and the shaft are integrally fixed by cooling and hardening the same.

The present invention also provides a method for connecting a golf club head and a shaft, wherein the tip of the shaft is inserted into the shaft fitting hole of the golf club head to fix the two together.
Metal layers are integrally fixed to the inner peripheral surface of the shaft fitting hole and the outer peripheral surface of the shaft tip portion before they are fitted to each other, and at least one surface of these metal layers is melted by heat into a sheet shape. A metal is fixed, and in this state, the tip of the shaft is inserted into the shaft fitting hole of the golf club head. Then, the sheet metal is heated to melt it, and then it is cooled and hardened to form a golf club head. A method of connecting a golf club head and a shaft, which fixes the shaft integrally, is proposed.

Further, according to the present invention, in a method of connecting a golf club head and a shaft, wherein a tip portion of a shaft is inserted into a shaft fitting hole of a golf club head so as to fix the both, a shaft fitting hole before being fitted to each other. Metal layers are integrally fixed to the inner peripheral surface and the outer peripheral surface of the shaft tip, respectively, and particulate metal that is melted by heat is attached to at least one surface of both metal layers. A golf club head that is inserted into a shaft fitting hole of a golf club head, and then heats the adhered particulate metal to melt it, and subsequently cools and hardens it to integrally fix the golf club head and the shaft. A method of connecting shafts is proposed.

The present invention also provides a method for connecting a golf club head and a shaft, wherein the tip of the shaft is inserted into the shaft fitting hole of the golf club head to fix the two together.
Metal layers are integrally fixed to the inner peripheral surface of the shaft fitting hole and the outer peripheral surface of the shaft tip portion before they are fitted to each other, and at least one of these metal layers is made of a metal melted by heat. In this state, insert the tip of the shaft into the shaft fitting hole of the golf club head, then heat the metal that is melted by heat to melt it, and then cool and harden it to fix the golf club head and the shaft together. A golf club head and shaft coupling method is proposed.

Further, it is advantageous to use, as the heat-melting metal, a metal that generates heat when energized and is melted by the heat, and supply an electric current to the metal to melt it.

As the heat-melting metal, a metal that generates heat when energized and is melted by the heat is used. In addition to the heat-melting metal between the shaft fitting hole and the shaft tip, To allow local current flow between the golf club head and the shaft through the metal,
It is also possible to melt the metal by interposing a partially cut insulating layer and passing a current between the golf club head and the shaft through the cut portion of the insulating layer and the heat-meltable metal.

At this time, it is advantageous to fill the cut portion of the insulating layer with a conductive material.

It is also possible to heat a metal which is melted by heat with a heater to melt the metal.

Furthermore, it is particularly advantageous if the heat-melting metal is a metal that melts at a temperature of 150 ° C. to 600 ° C.

Further, the tip of the shaft is formed in a taper shape which is tapered toward the most distal end thereof, and the shaft fitting hole is formed in a taper shape corresponding to the taper shape of the tip of the shaft. Is desirable.

Further, it is advantageous that at least one of the inner peripheral surface of the shaft fitting hole and the outer peripheral surface of the shaft tip portion inserted into the shaft fitting hole is subjected to storm processing.

Further, it is preferable that at least one surface of both metal layers fixed to the inner peripheral surface of the shaft fitting hole and the outer peripheral surface of the shaft tip portion is subjected to storm processing.

[0031]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing a golf club head 1 and a shaft 2 before being coupled, and a neck portion 3 of the head 1 is fitted with a shaft extending toward a sole portion 4 as shown in FIG. The hole 5 is formed. In this example, both the golf club head 1 and the shaft 2 are made of a conductive material such as stainless steel or aluminum.

In order to connect the golf club head 1 and the shaft 2, first, as shown in FIG. 1, a flexible sheet-shaped metal 6 is prepared which generates heat when energized and is melted by the heat. Hereinafter, the sheet-shaped metal 6 will be referred to as a metal sheet. Next, the metal sheet 6 is wound around the outer peripheral surface of the shaft tip portion 7 before being inserted into the shaft fitting hole 5. The metal sheet 6 has both sides 106
Adhesive flux is applied to a and 106b in advance.

In FIG. 2, the metal sheet 6 is attached to the tip portion 7 of the shaft.
The state when the metal sheet 6 is wound around the shaft 2 is lightly temporarily fixed to the shaft 2 by the adhesive flux applied to the metal sheet 6, and the metal sheet 6 is prevented from being separated from the shaft 2.

After the metal sheet 6 is wound around the shaft tip portion 7 in this manner, the shaft tip portion 7 is inserted into the shaft fitting hole 5 of the golf club head 1 as indicated by an arrow A in this state. FIG. 3 shows a state after the shaft is inserted.

Next, with respect to the conductive shaft 2 and the golf club head 1 which is also conductive, as shown in FIG.
The positive side and the negative side of the power source 8 are connected to each other to supply a current to the metal sheet 6. By passing an electric current through the metal sheet 6 in this manner, the metal sheet 6 generates heat due to its own electric resistance and is melted by the heat. The molten metal spreads so as to penetrate into the clearance between the outer peripheral surface of the shaft tip portion 7 and the inner peripheral surface of the shaft fitting hole 5. Then, when the power supply to the metal sheet 6 is cut off, the molten metal is rapidly cooled and hardened, and the golf club head 1 and the shaft 2 are integrally fixed.

It is a matter of course that the heating temperature is set so that the golf club head 1 and the shaft 2 are not melted when the metal which is melted by heat, in this example, the metal sheet 6 is melted by heating. The same applies to each of the examples described below.

Since the metal sheet 6 is previously coated with a flux, when the metal sheet 6 is melted, the flux prevents generation of oxides, and the golf club head 1 and the shaft 2 are firmly integrated. You can After the joining work is completed, for example, the flux attached to the portion around the shaft 2 on the upper end surface of the neck portion 3 may be washed by, for example, washing with water.

According to the method of coupling the golf club head 1 and the shaft 2 described above, the golf club head 1 and the shaft 2 are fixed to each other by melting the metal sheet 6 and then hardening the metal sheet 6. It is not necessary to inject the epoxy resin into the fitting hole 5, and there is no room for such a problem that these nozzles become clogged and work is interrupted.

Further, it is not necessary to perform a complicated work such as periodically checking the mixed state of the two liquids, and it takes an extremely short time to melt the metal sheet 6 and then to cool and harden it. Therefore, the golf club head 1 and the shaft 2 can be coupled very efficiently.

Further, when the golf club head 1 and the shaft 2 are connected by an epoxy resin as in the conventional case, after the connection, for example, only the golf club head 1 or the shaft 2 is replaced with another new epoxy resin. When the golf club head 1 and the shaft 2 are separated by heating the
It was necessary to remove the epoxy resin adhering to this and wash it, and the work had to be very complicated. However, according to the above-described method of the present invention, after the golf club head 1 and the shaft 2 are coupled to each other, an electric current is again passed through the metal to melt the metal, the golf club head 1 and the shaft 2 are separated, and then the head is directly used. The golf club head and the shaft can be fixed again by simply refitting the shaft and the shaft to melt the metal and then cooling and hardening the metal. No work such as cleaning is required.

As the metal sheet 6, silver solder, gold solder,
Various brazing materials made of a metal such as special nickel braze or solder, especially solder for aluminum, or an alloy thereof can be appropriately used.

Further, in order to enhance the bonding force between the golf club head 1 and the shaft 2 which are bonded together, the metal sheet 6 to be used is used.
It is desirable to make the thickness of the film as thin as possible within the range allowed by the manufacturing technology. According to experiments, when the thickness of the metal sheet 6 is set to 0.2 mm or less, particularly 0.05 to 0.03 mm, which is possible with the current manufacturing technology, the coupling force between the golf club head 1 and the shaft 2 is effective. I was able to raise it. For the same reason, the number of times the metal sheet 6 is wound around the shaft tip portion 7 is preferably small, and it is desirable that the metal sheet 6 be wound once. Such a thin metal sheet 6
By using, the molten metal does not overflow to the outside of the shaft fitting hole 5 even when it melts, and it is possible to reliably prevent the problem that burrs remain on the completed golf club.

Further, as shown in FIG. 3, the shaft fitting hole 5
The metal sheet 6 may be wound around the entire length of the shaft tip portion 7 inserted into the shaft 7, but may be wound around only a part of the shaft tip portion 7 in the length direction.

By the way, in the above-mentioned embodiment, as the metal which is melted by heat, the metal sheet 6 which generates heat when energized and is melted by the heat is used, and an electric current is supplied to the metal sheet 6 to melt it. However, the metal sheet 6 may be heated by a heater to be melted. This method can be applied even when the golf club head 1 and the shaft 2 are not made of a conductive material, an example of which is shown in FIG.

Also in this embodiment, the shaft fitting hole 5
The metal sheet 6 to which the flux is applied and which is melted by heat is wound around the outer peripheral surface of the shaft tip portion 7 before being inserted into the shaft, and the tip portion 7 is inserted into the shaft fitting hole 5 of the golf club head 1. .

On the other hand, a rod-shaped heater 15 is inserted into the hollow inside of the shaft 2 as shown by an arrow C.
The heater 15 has a heat generating portion at the tip end thereof, which is double-hatched in FIG.

After the above preparatory work is performed, the heater 15 is operated to generate heat in its heat generating portion, which heats the metal sheet 6 and melts it. Subsequently, the heater 15 is turned off, or the heater 15 is pulled out from the shaft 2 to cool the molten metal and harden it, whereby the golf club head 1 and the shaft 2 are integrally fixed.

As the rod-shaped heater 15, a heater whose diameter is substantially equal to the inner diameter of the shaft 2 is used, and when the metal sheet 6 is heated, there is no clearance between the inner peripheral surface of the shaft 2 and the heater 15. In this case, the efficiency of heat conduction to the metal sheet 6 can be increased, and the work of connecting the golf club head 1 and the shaft 2 can be performed particularly in a short time.

In each of the above-described embodiments, the metal sheet 6 as a metal that is melted by heat is wound around the shaft tip portion 7 before being fitted into the shaft fitting hole 5 and temporarily fixed, but instead of this, they are fitted together. Shaft fitting hole 5 before mating
At least one of the inner peripheral surface of the metal sheet and the outer peripheral surface of the shaft tip portion 7 is melted by the same heat as in the previous embodiment.
And the shaft tip portion 7 is inserted into the shaft fitting hole 5 of the golf club head 1 in this state, and then the sheet 6 is heated by the above-mentioned energization or the heater 15 to melt it, and this is continued. The golf club head 1 and the shaft 2 may be integrally fixed by cooling and hardening.

To fix the metal sheet 6 to the outer peripheral surface of the shaft tip, for example, after winding the metal sheet 6 to which the flux has adhered around the outer peripheral surface of the shaft tip 7 in exactly the same manner as in FIG. A plurality of portions of the metal sheet 6 are heated, for example, in a dot shape by an appropriate heating device to melt the respective portions, which are then cooled and hardened to fix the metal sheet 6 to the shaft tip portion 7. be able to. A similar method can be adopted when fixing the metal sheet 6 to the inner peripheral surface of the shaft fitting hole 5.

According to this embodiment, since the metal sheet 6 does not shift when the shaft tip portion 7 is inserted into the shaft fitting hole 5, the work can be performed more efficiently.

As the heat-melting metal, a particulate metal, that is, a powdery metal can be used instead of the metal sheet 6. In this case, heat-melting particulate metal is adhered to at least one of the inner peripheral surface of the shaft fitting hole 5 and the outer peripheral surface of the shaft tip portion 7 before they are fitted to each other, and in that state, the shaft tip The portion 7 is inserted into the shaft fitting hole of the golf club head 1, and then the adhered particulate metal is heated by the aforementioned energization or the heater 15 to melt it, and then it is cooled and hardened to cool and harden the golf club head 1 The shaft 2 and the shaft 2 may be integrally fixed. To attach the particulate metal to the inner peripheral surface of the shaft fitting hole 5 or the outer peripheral surface of the shaft tip portion 7, for example, a powdery metal that is melted by heat is dispersed in a cream-like flux,
This may be applied to the inner peripheral surface or the outer peripheral surface. Of course, other attachment methods can be appropriately adopted.

Also in this embodiment, since the metal sheet 6 is not used, it is possible to prevent the workability from being deteriorated due to the displacement of the metal sheet when the shaft tip portion 7 is inserted into the shaft fitting hole 5.

Further, instead of using the metal sheet 6 or the particulate metal as the heat-melting metal, the heat-melting metal is hardened on the inner peripheral surface of the shaft fitting hole 5 and the outer peripheral surface of the shaft tip portion 7. Coating in the above state, and then fitting the shaft fitting hole 5 and the shaft tip portion 7 together, melting the metal, and subsequently cooling and hardening the metal to integrally fix the golf club head 1 and the shaft 2. You can also
5 to 7 show an embodiment of such a method.

First, as shown in FIG. 5, the molten metal 6a is housed in the container 16, and the neck portion 3 of the golf club head 1 and the tip portion 7 of the shaft 2 are immersed in the molten metal 6a. Next, when these are pulled up from the molten metal 6a and cooled by the outside air, as shown in FIG. 6, the inner peripheral surface of the shaft fitting hole 5 and the shaft tip portion 7 before they are fitted to each other.
The outer peripheral surface of the is coated with the metal 6b that is melted by heat in a cured state.

As shown in FIG. 5, a ventilation hole 1a for communicating the shaft fitting hole 5 with the outside air is formed at an appropriate position of the golf club head 1, whereby the head 1 is immersed in the molten metal 6a. At this time, the molten metal 6a is surely allowed to enter the inside of the shaft fitting hole 5.

When the golf club head 1 and the shaft 2 are immersed in the molten metal, the masking tape 17 is applied to the tip 9 of the shaft 2 and the outer peripheral surface of the neck portion 3 of the golf club head 1 as shown in FIG. , 18 are attached or a masking agent is applied to prevent the metal from being coated on the portions other than the outer peripheral surface of the shaft tip portion 7 and the inner peripheral surface of the shaft fitting hole 5. After pulling up the golf club head 1 and the shaft 2 from the molten metal 6a, the masking sheets 17 and 18 are peeled off or the masking agent is removed.

Further, liquid flux is applied to the outer peripheral surface of the shaft tip portion 7 and the inner peripheral surface of the shaft fitting hole 5 before dipping them in the molten metal 6a, and these portions are securely attached. The molten metal 6a is adhered to the metal so that the metal 6b can be coated.

After the hardened metal 6a is coated on the inner peripheral surface of the shaft fitting hole 5 and the outer peripheral surface of the shaft tip portion 7 as described above, in that state, as shown by an arrow D in FIG. The portion 7 is inserted into the shaft fitting hole 5 of the golf club head 1. The state when the insertion is completed is shown in FIG.

Next, the coated metal 6b is heated to melt it again, and then it is cooled and hardened to fix the golf club head 1 and the shaft 2 integrally. The heating of the metal 6b in this case may also be carried out by supplying an electric current to the coated metal 6b in the same manner as in the embodiment shown in FIG. 3 to generate heat, but the embodiment shown in FIG. Then, just as in the case of FIG. 4, the heater 15 is inserted into the shaft 2 to heat the metal 6b.

As described above, the method of immersing the inner peripheral surface of the shaft fitting hole 5 and the outer peripheral surface of the shaft tip portion 7 in the molten metal 6a and coating the metal 6b which is melted by heat is generally performed by dobbing plating. Alternatively, instead of such a method, the inner peripheral surface of the shaft fitting hole 5 and the outer peripheral surface of the shaft tip portion 7 are coated with heat-melting metal 6b by electrolytic plating or electroless plating. , Then Fig. 6
And in the same manner as described above with reference to FIG.
Heat the coated metal by the heater 15 or energization,
Alternatively, the golf club head 1 and the shaft 2 may be fixed integrally by melting and then cooling and hardening.
The metal 6b is formed by the electrolytic plating or the electroless plating method.
5 is also used, a masking tape (or masking agent) is used as shown in FIG. 5, and only the outer peripheral surface of the shaft tip portion 7 and the inner peripheral surface of the shaft fitting hole 5 are coated with the metal 6b.

As described above, the metal 6b can be coated on the inner peripheral surface of the shaft fitting hole 5 and the outer peripheral surface of the shaft tip portion 7 by various plating methods. At that time, the metal of the shaft tip portion 7 or the shaft fitting hole 5 can be coated. The metal 6b may be coated over the entire longitudinal direction, or the metal 6b may be coated only on a part of each longitudinal direction.
b may be coated. This is the same when the above-mentioned particulate metal is used and when the metal sheet 6 is fixed to the outer peripheral surface of the shaft tip portion 7 and / or the inner peripheral surface of the shaft fitting hole 5.

Shaft fitting hole 5 before fitting each other
6b on both the inner peripheral surface of the shaft and the outer peripheral surface of the shaft tip 7
Instead of coating either one of them with the metal 6b by each of the methods described above, and then heat-melting the metal 6b in the cured state according to the procedure described above, the golf club head 1 and the shaft 2 are It can also be fixed integrally. At least one of the inner peripheral surface of the shaft fitting hole 5 and the outer peripheral surface of the shaft tip portion 7 may be coated with the heat-melting metal 6b.

According to the embodiment shown in FIGS. 5 to 7,
In addition to the same effect as in the case of the embodiment described above with reference to FIGS. 1 to 4, when the shaft tip portion 7 is inserted into the shaft fitting hole 5, it is necessary to apply flux to the coated metal 6b. This makes it possible to omit the flux cleaning work.

When the inner peripheral surface of the shaft fitting hole 5 and the outer peripheral surface of the shaft tip portion 7 are coated with metal 6b, the thickness can be made particularly thin. In the dip plating method using the molten metal 6a, the thickness of the metal 6b can be reduced. About 0.01 to 0.05 mm, or metal 6 when using electrolytic or electroless plating
The thickness of b can be about 0.003 to 0.008 mm. When the golf club head 1 and the shaft 2 are fixed to each other by forming such an extremely thin layer of the metal 6b, and melting and hardening the layer, the bonding strength can be further increased. In addition, the time required for energizing or melting the metal 6b by the heater 15 and then hardening it can be greatly shortened, and the work of connecting the golf club head 1 and the shaft 2 can be completed in an extremely short time. In addition, it is possible to more reliably prevent the problem of burr on the completed golf club.

As described above, instead of coating the metal 6b with various kinds of plating, heat is applied to at least one of the inner peripheral surface of the shaft fitting hole 5 and the outer peripheral surface of the shaft tip portion 7 before fitting with each other. A metal sheet to be melted (sheet-shaped metal) is attached, then this is heated by an appropriate heating means to be melted, and then this is cooled and hardened again, so that the inside of the shaft fitting hole 5 before fitting to each other At least one of the peripheral surface and the outer peripheral surface of the shaft tip portion 7 may be coated with a metal 6b that is melted by heat. This metal sheet is also the same as that shown in FIG. 1, and the metal sheet 6 coated with flux is wound around the inner peripheral surface of the shaft fitting hole 5 or the outer peripheral surface of the shaft tip portion 7, or as described above. By fixing, the metal sheet may be attached to at least one of the inner peripheral surface of the shaft fitting hole 5 and the outer peripheral surface of the shaft tip portion 7.

Further, instead of coating the metal 6b with a metal sheet or plating as described above, heat is applied to at least one of the inner peripheral surface of the shaft fitting hole 5 and the outer peripheral surface of the shaft tip portion 7 before fitting with each other. By adhering a particulate metal to be melted, then heating it by an appropriate heating means to melt it, and subsequently cooling and hardening it again, the inner peripheral surface of the shaft fitting hole 5 before fitting to each other At least one of the outer peripheral surfaces of the shaft tip portion 7 can be coated with a metal that is melted by heat in a hardened state. Also in this case, in order to attach the particulate metal that is melted by heat to the inner peripheral surface of the shaft fitting hole 5 and the outer peripheral surface of the shaft tip portion 7, for example, as in the case of the previous embodiment, powder The metal particles may be dispersed in the cream flux and applied to the inner and outer peripheral surfaces.

Even when the metal sheet or the particulate metal is used to coat the metal 6b as described above, the subsequent processing is the same as that described above with reference to FIGS. 6 and 7. .

By the way, in each of the above-mentioned methods of coating the surfaces of the golf club head 1 and the shaft 2 with metal,
At least the surface to be coated with metal must be made of metal. In other words, it is difficult to directly coat the metal 6b on the golf club head or shaft made of a synthetic resin such as an epoxy resin or a material in which reinforcing fibers such as carbon fibers and glass fibers are mixed in the resin.

Therefore, in the embodiment shown in FIG. 8, a thin metal layer 1 made of metal is first formed on the outer peripheral surface of the shaft tip portion 7 and the inner peripheral surface of the shaft fitting hole 5 before they are fitted to each other.
9 and 20 are integrally fixed to each other, and these metal layers 1
At least one of the surfaces 9 and 20 is immersed in the molten metal 6a in exactly the same manner as in the embodiment shown in FIG. 5, and the metal layer is coated with the heat-melting metal 6b (FIG. 8). In the above example, both the metal layers 19 and 20 are coated with the metal 6b). Instead of forming the metal 6b coat layer by dip plating as described above, both metal layers 1
It is also possible to coat at least one of the surfaces 9 and 20 with a metal 6b that is melted by heat in a cured state by electrolytic or electroless plating.

After the coating layer made of the metal 6b in the cured state is formed in this manner, the shaft tip portion 7 is attached to the shaft fitting hole of the golf club head 1 in the same manner as shown in FIGS. 5, the coated metal 6b is heated by a rod-shaped heater 15 inserted in the shaft 2 as shown in FIG. 8 to melt it, and subsequently it is cooled and hardened to cool the golf club head 1 and the shaft 2. To be fixed together.

In the above-described specific example, at least one surface of both metal layers 19 and 20 is coated with a metal that is melted by heat by plating, but at least one surface of both metal layers 19 and 20 is coated with heat. A particulate metal to be melted is attached and then heated by an appropriate heating means to melt,
Then, by cooling and hardening the same again, at least one surface of both metal layers 19 and 20 can be coated with the heat-melting metal 6b in a hardened state.
Also in this case, for example, a powdery metal that melts by heat is dispersed in a cream-like flux, and
By coating at least one of 9 and 20, particulate metal can be attached to the metal layer.

Further, a heat-melting metal sheet is wound around or fixed on at least one surface of both metal layers 19 and 20 in the same manner as shown in FIG. 1, and then this is heated by an appropriate heating means. It is also possible to coat at least one surface of both metal layers 19 and 20 with a metal that can be melted by heat, by melting and melting and then hardening by cooling.

As shown in the above examples, the metal layers 19,
20 are integrally fixed to the outer peripheral surface of the shaft tip portion 7 and the inner peripheral surface of the shaft fitting hole 5, respectively, and then the metal layer 19,
Instead of forming a metal coat 6b on the shaft 20, the shaft 2
And the metal layers 19 and 2 before being attached to the golf club head 1.
As described above, the surface of No. 0 is coated with metal 6b by plating, particulate metal or a metal sheet, and then these metal layers 19 and 20 are integrally fixed to the shaft tip portion 7 and the shaft fitting hole 5. You may do it.

According to the respective methods of providing the metal layers 19 and 20 as described above, the golf club head 1 and the shaft 2 which use a synthetic resin such as an epoxy resin as a base material are surely integrated by the coated metal 6b. be able to. Further, in a state where the shaft tip portion 7 and the shaft fitting hole 5 are fitted, a part of the metal layers 19 and 20 is partially covered with the golf club head 1.
These metal layers 19 and 20 are fixed to the golf club head 1 and the shaft 2 so as to protrude to the outside, and the protruding metal layer portions are connected to the positive and negative sides of the power source in the same manner as in FIG. Alternatively, an electric current may be applied to the metal layers 19 and 20 and the coated metal 6b to heat the metal 6b to melt it. Even when the metal layers 19 and 20 are provided in this manner, the metal 6 is supplied by energization regardless of the heater 15.
It is possible to melt b.

Even when the metal sheet 6 is used as the metal for connecting the golf club head 1 and the shaft 2 as in the embodiment shown in FIGS. 1 to 4, the golf club head 1 and the shaft 2 are made of epoxy resin. When it is made of such a synthetic resin-based material, it is difficult to melt and cure the metal sheet 6 to fix the golf club head 1 and the shaft 2 to each other. Therefore, also in this case, the metal layers 19 and 20 are integrally fixed to the outer peripheral surface of the shaft tip portion 7 and the inner peripheral surface of the shaft fitting hole 5 before they are fitted to each other in exactly the same manner as in FIG. Next, the heat-melting metal sheet 6 is wrapped around the outer peripheral surface of the metal layer 19 fixed to the shaft tip portion 7, and in that state, the shaft tip portion 7 is inserted into the shaft fitting hole 5 of the golf club head 1, Next, the metal sheet 6 can be heated by the above-mentioned energization or the heater 15 to melt it, and then it can be cooled and hardened to fix the golf club head 1 and the shaft 2 integrally.

In order to achieve the same purpose as described above, metal layers 19 and 20 are integrally formed on the inner peripheral surface of the shaft fitting hole 5 and the outer peripheral surface of the shaft tip portion 7 before they are fitted to each other. A metal sheet 6 that is melted by heat is fixed to at least one surface of these metal layers 19 and 20, and in this state, the tip of the shaft is inserted into the shaft fitting hole 5 of the golf club head. It is also possible to heat the metal sheet 6 by energizing or heating it with a heater to melt it, and subsequently cool and cure it to fix the golf club head and the shaft integrally. Metal layer 1 in this case
The fixing of the metal sheet 6 to the sheets 9 and 20 is also carried out, for example, by winding the metal sheet 6 to which the flux is attached around the metal layers 19 and 20, then heating and melting a plurality of portions of the sheet 6 and then cooling and curing the sheet again. This can be done by

Further, in order to achieve the same purpose as described above, the metal layers 19 and 20 are integrally formed on the inner peripheral surface of the shaft fitting hole 5 and the outer peripheral surface of the shaft tip portion 7 before they are fitted to each other. Particle particles that are fixed and melted by heat are attached to at least one surface of both metal layers, and in that state, the shaft tip portion 7 is inserted into the shaft fitting hole 5 of the golf club head 1 and then attached. It is also possible to heat the particulate metal by energizing or heating it with a heater to melt it, and subsequently cool and cure it to fix the golf club head and the shaft integrally. Also in this case, for example, a powdery metal that is melted by heat is dispersed in a cream-like flux and applied to the metal layers 19 and 20, whereby the particulate metal can be attached to the metal layer.

Metal layer 1 shown in each of the above embodiments
9 and 20 can be fixed to the outer peripheral surface of the shaft tip portion 7 and the inner peripheral surface of the shaft fitting hole 5 by adhesion or welding, respectively, but when manufacturing the golf club head 1 and the shaft 2, When molding the metal layer 19,
When the shaft 20 and the golf club head 1 are integrally formed with the shaft 20, the metal layers 19 and 20 can be easily formed.
And can be fixed to the head 1. Further, as the material of the metal layers 19 and 20 used at this time, a thin film sheet such as stainless steel or aluminum can be used, and powder metal can also be used, and these can be used as the golf club head 1 or the shaft 2. On the other hand, they are integrally fixed at the time of molding.

If the metal layers 19 and 20 are made of stainless steel, aluminum or the like as exemplified above, when the metal which is melted by heat is heated by the energization or the heater 15 as described above, the metal layers 19 and 20 are heated. No. 20 does not melt. On the other hand, as the metal layers 19 and 20, a metal that is melted by the energization or the heater 15 may be used. In this case, as described above, the metal layer 1
On the surface of 9, 20, the metal (metal sheet 6,
The particulate metal or the coated metal 6b) may not be provided. That is, the metal layers 19 and 20 are respectively fixed to the inner peripheral surface of the shaft fitting hole 5 and the outer peripheral surface of the shaft tip portion 7 before they are fitted to each other.
At least one of 20 is made of heat-melting metal, and in that state, the shaft tip 7 is inserted into the shaft fitting hole 5 of the golf club head, and then the heat-melting metal is heated to melt it. Then, the golf club head 1 and the shaft 2 may be integrally fixed by cooling and hardening them.

Further, as the heat-melting metal used in FIGS. 5 to 8 and each of the embodiments described in connection therewith, for example, silver solder, ordinary solder such as an alloy of tin and lead (SN63, etc.) is used. ) Or an appropriate brazing material such as aluminum solder, but the use of aluminum solder provides the following advantages.

Aluminum solder having various properties is commercially available from Nippon Aluminum Co., Ltd. under the trade name of "aluminum". Such aluminum solder has a bonding strength of 10 to 20 kg / mm ^{2, which} is a normal value. It is higher than the solder, and by using such solder, the golf club head 1 and the shaft 2 can be fixed particularly firmly. Further, if the bonding strength is high as described above, the amount of aluminum solder used can be reduced, and the cost of the golf club can be reduced. The same advantages can be obtained by using the solder for aluminum as the metal sheet 6 used in FIGS. 1 to 4 and the embodiments described in connection therewith.

If a metal having a relatively low melting point that melts at a temperature of 150 ° C. to 600 ° C. is used as each metal that is melted by heat used in each of the above-mentioned embodiments, such a metal is heated by the heater 15 or energization. When this is melted, the golf club head 1 and the shaft 2 do not have to be exposed to a high temperature to the left, and the golf club head 1 and the shaft 2 which are weak against heat can be fixed without any trouble. For example, in the golf club head 1 and the shaft 2 having a synthetic resin such as an epoxy resin as a base material, the base material is weak to heat, but if the metal having a low melting point as described above is used as the metal that is melted by heat,
The head 1 and the shaft 2 as described above can also be joined without deteriorating the base material. This is the same when the metal sheet 6 shown in FIGS. 1 to 4 or a particulate metal is used instead of the metal 6b formed of the coat layer.

The above-mentioned solder for aluminum has a melting temperature of 200 to 500 ° C. which is within the above-mentioned range of 150 to 600 ° C. Therefore, the solder for aluminum is used for the metal 6 b, the metal sheet 6 and the particulate metal. When used as a “heat-melting metal” such as the heat-melting metal layers 19 and 20, not only can the bonding strength between the golf club head 1 and the shaft 2 be increased, but also the golf club head 1 and the shaft 2 can be strengthened. Even when the base material is a synthetic resin such as an epoxy resin, there is an advantage that the thermal deterioration can be surely prevented.

As can be understood from the above-described embodiments, the form of the "heat-melting metal" used in the present invention may be a sheet form or a coated form, or It may be in the form of particles or a metal layer. The gist of the present invention is to interpose a metal that melts by heat between the shaft fitting hole and the tip of the shaft so that they are fitted together, heat the metal to melt it, and then cool it. The point is that the golf club head and the shaft are integrally fixed by curing.

By the way, in each of the above-mentioned embodiments, various forms of "metals that are melted by heat" interposed between the shaft fitting hole 5 and the shaft tip portion 7 are heated by energization to melt them. At this time, as can be understood from FIG. 3, the energization area for the metal melted by heat, for example, the metal sheet 6 or the coated metal 6b becomes very large,
To melt such a metal by heating it by energizing,
It is necessary to pass a very large current here. For example, in FIG.
Considering the example shown in (1), the total area where the metal sheet 6 contacts the inner peripheral surface of the shaft fitting hole 5 is the current-carrying area. Here, this area is A, the total resistance of the metal sheet 6 is R, the thickness of the sheet 6 is L, the current flowing through the metal sheet 6 is I,
When the electrical resistivity is φ, these have a relation of R = φ × L / A, and the calorific value W is represented by W = I × R ² , but since the energized area A is very large, the resistance is In order to reduce R and obtain the heat generation amount W for melting the metal sheet 6, it is necessary to make the value of the current I very large. For example, a current value of about 2000 to 5000 amperes is required. However, manufacturing a golf club head on a manufacturing line while applying such a high current causes a safety problem for workers.

The embodiment shown in FIG. 9 eliminates the above-mentioned problems. In FIG. 9, on the outer peripheral surface of the shaft tip portion 7 before being fitted into the shaft fitting hole, a metal which is heated by energization and is melted by the heat by the method described in detail above, here the metal 6b. Is coated. Then, the outer peripheral surface of the metal 6b is coated with an electrically insulating layer 21 made of, for example, enamel, silicon, gallium, or an appropriate synthetic resin. And
A large number of linear scratches 22 are made on the insulating layer 21 by a sharp tool, the insulating layer 21 is cut off at the scratches 22 and the metal 6 is formed at the scratches 22.
b is exposed. When the portion of the scratch 22 is referred to as a cut portion, the insulating layer 21 having the cut portion 22 is laminated on the outer peripheral surface of the metal 6b.

The tip portion 7 of such a shaft is inserted into the shaft fitting hole 5 of the golf club head 1 as shown by a chain line in FIG. 9, and the shaft 2 and the golf club head 1 are also connected as shown by a chain line. The positive side and the negative side of the power source 8 are connected and a current is passed between them. At this time, metal 6
There is an insulating layer 21 around b, in which the cutout 22
Therefore, the electric current will flow through the cutout portion 22 and the portion of the metal 6b corresponding thereto. For this reason,
The current-carrying area A of the metal 6b is drastically reduced, the value of its resistance R is increased, and a large amount of heat generation W can be obtained even if the value of the current I is decreased, and this heat can melt the metal 6b.

At this time, the molten metal overflows from the cutout portion 22 to the inner peripheral surface side of the shaft fitting hole 5, and the insulating layer 21 is destroyed by heat, so that the molten metal is blown to the outer periphery of the shaft tip portion 7. The shaft 2 and the golf club head 1 can be firmly fixed to each other by extending the entire surface and the inner peripheral surface of the shaft fitting hole 5. Once the metal 6b is melted, the energization is cut off, so that even if the insulating layer 21 is destroyed as described above, it is possible to prevent the problem that an excessive current flows in the melted metal.

The current-carrying area A, that is, the value of the current I can be freely controlled depending on how much the cutout 22 is formed.
For example, even if the value of the current I is reduced to several hundred amperes, the metal 6b can be melted without any trouble. In this way, safety on the production line can be secured.

In the example of FIG. 9, the insulating layer 21 is provided on the shaft tip 7 side, but as shown in FIG. 10, the metal 6b coated on the inner peripheral surface of the shaft fitting hole 5 of the golf club head 1 is coated. The surface of the golf ball is coated with an insulating layer 21 which is partially cut to form a cut portion 22, and a shaft tip portion 7 is inserted inside thereof as shown by a chain line, and a current is applied between the shaft 2 and the golf club head 1. The same effect as in the case of FIG.

Alternatively, the above-mentioned insulating layer 21 may be formed on both the shaft tip portion 7 and the shaft fitting hole 5, and the two may be fitted to each other to conduct electricity. That is, the shaft tip portion 7 shown in FIG. 9 is fitted into the shaft fitting hole 5 shown in FIG. In this case, the cut portion 22 on the shaft 2 side and the cut portion 22 on the golf club head side are
Each resection 2 so as to face each other in whole or in part.
Set the formation position of 2. For example, when the cutout 22 on the shaft tip 7 side shown in FIG. 9 is formed along the longitudinal direction of the shaft 2, the cutout 22 on the shaft fitting hole 5 side is formed in the circumferential direction, Alternatively, when the shaft tip portion 7 and the shaft fitting hole 5 are formed in a spiral shape, when the shaft tip portion 7 and the shaft fitting hole 5 are fitted to each other, both cutout portions 22 are made to partially cross each other so that the cutout portions 22 face each other. Make sure that the effect is obtained.

In the embodiment shown in FIG. 11, the insulating layer 21 having the cutout portion 22 is laminated on the outer peripheral surface of the shaft tip portion 7, and the metal 6b made of a coat layer is laminated on the surface thereof.

Similarly, in the embodiment shown in FIG. 12, the insulating layer 21 having the cutout portion 22 is laminated on the inner peripheral surface of the shaft fitting hole 5, and the metal 6b is laminated on the surface thereof.

The shaft 2 and the golf club head 1 shown in FIGS. 11 and 12 can achieve the same effect as the embodiment shown in FIGS. 9 and 10.

In particular, in the structure shown in FIGS. 9 and 10, when a current is caused to flow between the golf club head 1 and the shaft 2 which are fitted to each other, a current is caused to flow at the cutout 22 due to discharge. It is conceivable that if these cutouts 22 are filled with a conductive substance, an electric current can flow through the conductive substance without depending on the discharge.

To fill the excision portion 22 with a conductive substance,
For example, a metal may be coated by plating or the like, or a conductive liquid such as water or a cream-like conductor may be applied on the insulating layer 21 having the cutout portion 22 formed thereon.

It is possible to control the energization amount and the heat generation amount by appropriately selecting the amount of the above-mentioned conductive substance or the material thereof.

The structure provided with the above-mentioned insulating layer 21 can be applied to all the embodiments described above. That is, even when the heat-melting metal is the metal sheet 6, the particulate metal, or the metal layers 19 and 20, it can be applied without any trouble. In short, in each of the above-described embodiments, as the metal that melts by heat, a metal that generates heat when energized and that melts by the heat is used, and the metal that melts between the shaft fitting hole 5 and the shaft tip portion 7 is melted by heat. In addition to the metal, a partially cut insulating layer 21 is interposed so as to allow a local current flow between the golf club head 1 and the shaft 2 through the metal. 1 between the shaft 1 and the shaft 2, an electric current is caused to flow through the cutout portion 22 of the insulating layer 21 and a heat-melting metal to melt the metal, which is subsequently cooled and hardened to separate the golf club head 1 and the shaft 2. It sticks together.

Further, the metal sheet 6 is used as the metal to be melted, and the metal sheet 6 is wound around the shaft tip portion 7 or fixed to the tip portion 7 or the shaft fitting hole 5, or the metal sheets 19 and 20 are used. Against the above-mentioned insulating layer 21
When the configuration of 1 is applied, the metal sheet 6 and the metal layers 19 and 2 before being attached to the shaft tip portion 7 and the shaft fitting hole 5 are used.
0 is coated with the insulating layer 21 in advance, and then the metal sheet 6
Alternatively, the metal layers 19 and 20 may be attached to the shaft tip portion 7 and the shaft fitting hole 5 as described above. The cutout portion 22 can be formed at a proper time during the series of steps.

By the way, in each of the embodiments described above, FIG.
As shown in FIGS. 8A to 8C, the shaft tip portion 7 is formed in a tapered shape that tapers toward the tip 9. Similarly, the shaft fitting hole 5 is also formed in a tapered shape corresponding to the taper shape of the shaft tip portion 7 such that the inner side of the fitting hole 5 is thin.

When the shaft tip portion 7 and the shaft fitting hole 5 are formed in a taper shape in this manner, heat-melting metal, that is, the metal sheet 6, the coated metal 6b, the particulate metal, or the heat-melting metal. When the layers 19 and 20 and the like are heated by the heater 15 or energized to melt the layers, the shaft 2 and the golf club head 1 are, for example, shown in FIG.
By pressing in the directions approaching each other as indicated by arrow B, the outer peripheral surface of the shaft tip portion 7 and the inner peripheral surface of the shaft fitting hole 5 can be closely adhered through the molten metal. Thereby, the molten metal can be evenly distributed in the extremely narrow clearance between the outer peripheral surface of the shaft tip portion 7 and the inner peripheral surface of the shaft fitting hole 5, and the golf club head 1 and the shaft 2 The binding force of can be further increased.

As described above, according to the present invention, when the shaft tip portion 7 and the shaft fitting hole are formed in a tapered shape,
Although it can be applied particularly advantageously, it can be applied without any problems even when they are not tapered and have a straight straight cylindrical shape or other shapes.

Further, in each of the above-mentioned embodiments, the inner peripheral surface of the shaft fitting hole 5 and the shaft tip portion 7 inserted therein.
Although the outer peripheral surface may be formed to be smooth, at least one of the inner peripheral surface and the outer peripheral surface, preferably both, is subjected to a storm treatment, for example, by sandblasting, and innumerable minute irregularities are formed in advance. In other words, in each of the examples except for the examples in which the metal layers 19 and 20 that are not melted by heat are provided, the melted metal penetrates into these irregularities, and therefore the golf club head 1 and the shaft 2 when they are cured.
It is possible to further increase the binding force of At that time, if the amount of metal is set to such an extent that the molten metal fills the minute irregularities, the head 1 and the shaft 2 can be particularly firmly coupled.

Also in the embodiment in which the metal layers 19 and 20 are provided, the inner peripheral surface of the shaft fitting hole 5 and the outer peripheral surface of the shaft tip portion 7 inserted into the shaft fitting hole 5 are subjected to the blasting treatment so that It is possible to increase the bonding strength between the metal surface and the metal layers 20 and 19.

Further, in the structure using the metal layers 19 and 20, at least one surface of both metal layers 19 and 20 fixed to the outer peripheral surface of the shaft tip portion 7 and the inner peripheral surface of the shaft fitting hole 5 is subjected to a shaving process. It is preferable that the metal be heated or melted by the electric current or the heater 15 to penetrate into the unevenness so as to enhance the bonding force between the golf club head 1 and the shaft 2 when the metal is hardened.

Further, as shown in FIG. 13, the portion 11 of the shaft fitting hole 5 close to the shaft insertion opening 10 is the shaft 2.
There is also known a golf club in which the inner peripheral surface of the portion 11 is curved so as to be separated from the outer peripheral surface. The diameter of the shaft fitting hole portion 11 near the shaft insertion opening is gradually increased from the inner side of the hole 5 toward the shaft insertion opening 10, and the inner peripheral surface of the portion 11 is curved with a predetermined radius of curvature R. . As a result, a wedge-shaped gap G is formed between the inner peripheral surface of the shaft fitting hole portion 11 and the outer peripheral surface of the shaft.

In such a golf club, when the shaft 2 is elastically bent and deformed during the swing, the gap G is generated.
Therefore, the deformed shaft 2 does not hit the golf club head 1 strongly, and it is possible to prevent the shaft 2 from being damaged.

However, when manufacturing such a golf club, when the epoxy resin is injected into the shaft fitting hole 5 as in the conventional case and the shaft tip portion 7 is inserted therein, the epoxy injected into the fitting hole 5 is inserted. The resin overflows toward the gap G,
The gap G may be filled with the resin.
In this case, the gap G cannot be formed, and the above advantages cannot be obtained.

On the other hand, according to each of the above-mentioned methods of melting and hardening a metal to bond the golf club head 1 and the shaft 2, since the metal may be extremely thin, it is melted by electricity or the heater 15. At that time, there is no possibility that the molten metal will enter the gap G. Therefore, the gap G can be surely formed in the completed golf club, and the above-described advantages can be obtained without any trouble.

Although a wood type golf club head is shown in the drawings, the present invention is also applicable to a method of coupling a golf club head of another type and a shaft.

The present invention can also be configured by appropriately combining the above-described embodiments. For example, the metal sheet 6 and the particulate metal may be used together, or the metal sheet 6b coated with the metal sheet 6 may be used in an appropriate combination.

[0114]

According to the method described in claims 1 to 7,
The shaft and the golf club head are fixed by melting the metal that is present between the shaft tip and the shaft fitting hole, and then hardening the metal, so that the both can be efficiently and firmly joined in a short time. You can In addition, it is possible to prevent the problem that the finished golf club is burred. Further, by reheating the metal, the shaft and the golf club head, which are once joined together, can be easily separated, and the shaft and the golf club head can be easily fixed again integrally.

According to the method of the eighth aspect, the thickness of the metal melted by heat can be made particularly thin, whereby the coupling force between the golf club head and the shaft can be further enhanced. In addition, when the golf club head and the shaft are joined, the flux can be eliminated, so that the washing operation is not required and the work efficiency can be further improved.

According to the methods of claims 9 and 10,
The coated metal allows the golf club head and the shaft, which are made of synthetic resin as a base material, to be joined together without any trouble.

According to the method of the eleventh aspect, in addition to the above effects, the thickness of the metal melted by heat can be made particularly thin, so that the coupling force between the golf club head and the shaft can be further increased. When the golf club head and the shaft are joined, the flux can be eliminated, which eliminates the need for cleaning and further enhances the work efficiency.

According to the method of the twelfth to fifteenth aspects, the golf club head and the shaft, which are made of synthetic resin as a base material, can be joined together without any trouble.

According to the method of claim 16 or 19, the metal can be melted by a simple operation in a short time.

According to the seventeenth and eighteenth methods, the value of the electric current flowing through the metal melted by heat can be lowered, and the safety of work can be secured.

According to the method of claim 20, since the metal having a low melting point is used as the metal that is melted by heat, it is possible to prevent the trouble of exposing the golf club head and the shaft to high temperature, and use the synthetic resin as the base material. The golf club head and shaft can be joined together without any trouble.

According to the method of the twenty-first aspect, since the outer peripheral surface of the shaft tip portion and the inner peripheral surface of the shaft fitting hole can be closely adhered via the molten metal,
The coupling force between the shaft and the golf club head can be further enhanced.

According to the method of the twenty-second and twenty-third aspects, the molten metal can penetrate into the fine irregularities formed by the storm process, so that the shaft and the golf club head can be more firmly coupled. it can.

[Brief description of drawings]

FIG. 1 is a perspective view showing a golf club head and a shaft before coupling.

FIG. 2 is a partial cross-sectional view showing a state before a shaft tip portion around which a metal sheet is wound is inserted into a shaft fitting hole.

FIG. 3 is a cross-sectional view showing a state where a tip portion of a shaft is inserted into a shaft fitting hole and an electric current is applied to a metal sheet.

FIG. 4 is a cross-sectional view showing an example in which a metal sheet is melted by a heater.

FIG. 5 is a cross-sectional view showing a state where a shaft and a golf club head are immersed in molten metal.

FIG. 6 is a cross-sectional view showing a state of inserting a metal-coated shaft tip into a shaft fitting hole.

FIG. 7 is a cross-sectional view showing a state where the tip of the shaft is inserted into the shaft fitting hole to melt the coated metal.

FIG. 8 is a cross-sectional view showing an embodiment in which a metal layer is fixed to the outer peripheral surface of the shaft tip and the inner peripheral surface of the shaft fitting hole.

FIG. 9 is a transverse cross-sectional view of the shaft tip portion, showing an example of coating an insulating layer.

FIG. 10 is a cross-sectional view of a neck portion of a golf club head showing an example of coating an insulating layer.

FIG. 11 is a cross-sectional view of the tip of the shaft, showing an example of coating an insulating layer.

FIG. 12 is a cross-sectional view of a neck portion of a golf club head showing an example of coating an insulating layer.

FIG. 13 is a cross-sectional view showing a state where a shaft tip portion is inserted into a shaft fitting hole of a golf club head according to another embodiment.

[Explanation of symbols]

 1 Golf Club Head 2 Shaft 5 Shaft Fitting Hole 6 Sheet Metal 6a Molten Metal 6b Metal 7 Tip 7 Cutting Edge 15 Heater 19 Metal Layer 20 Metal Layer 21 Insulating Layer 22 Cutout

Claims (23)

[Claims] 1. A method of connecting a golf club head and a shaft, wherein a tip end portion of a shaft is inserted into a shaft fitting hole of a golf club head and fixedly secured to each other. A golf club characterized in that a metal melted by heat is fitted to each other, the metal is heated to melt the metal, and then the metal is cooled and hardened to integrally fix the golf club head and the shaft. How to connect the head and shaft. 2. A method for connecting a golf club head and a shaft, wherein a tip end portion of a shaft is inserted into a shaft fitting hole of a golf club head and fixed to each other, the outer periphery of the shaft tip end portion before being inserted into the shaft fitting hole. A sheet-shaped metal that is melted by heat is wrapped around the surface, and in that state, the tip of the shaft is inserted into the shaft fitting hole of the golf club head, and then the sheet-shaped metal is heated to melt it. A method for connecting a golf club head and a shaft, wherein the golf club head and the shaft are integrally fixed by cooling and hardening. 3. A method for connecting a golf club head and a shaft, wherein a tip end portion of a shaft is inserted into a shaft fitting hole of a golf club head and fixed to each other, the inner peripheral surface of the shaft fitting hole before being fitted to each other. A sheet-shaped metal that melts by heat is fixed to at least one of the outer peripheral surface of the shaft and the tip of the shaft, and in that state, the tip of the shaft is inserted into the shaft fitting hole of the golf club head. A method for connecting a golf club head and a shaft, which comprises heating and melting the same, followed by cooling and hardening the same to integrally fix the golf club head and the shaft. 4. A method for connecting a golf club head and a shaft, wherein a tip portion of a shaft is inserted into a shaft fitting hole of a golf club head so as to fix the both, and an inner peripheral surface of the shaft fitting hole before being fitted to each other. At least one of the outer peripheral surface of the shaft and the tip of the shaft is adhered with a heat-melting particulate metal, and in that state, the shaft tip is inserted into the shaft fitting hole of the golf club head, and then the adhered particulate metal is attached. A method for coupling a golf club head and a shaft, characterized in that the metal is heated to melt it, and then this is cooled and hardened to integrally fix the golf club head and the shaft. 5. A method for connecting a golf club head and a shaft, wherein a tip portion of a shaft is inserted into a shaft fitting hole of a golf club head so as to fix the both, and an inner peripheral surface of the shaft fitting hole before being fitted to each other. And at least one of the outer peripheral surfaces of the shaft tip portion is coated with a metal that is melted by heat in a hardened state, and the tip portion of the shaft is inserted into the shaft fitting hole of the golf club head in that state, and then the metal is coated. A method for connecting a golf club head and a shaft, characterized in that the golf club head and the shaft are integrally fixed by heating the golf club to melt it and subsequently cooling and hardening it. 6. A sheet-shaped metal that is melted by heat is attached to at least one of the inner peripheral surface of the shaft fitting hole and the outer peripheral surface of the shaft tip portion before they are fitted to each other, and then this is heated and melted. The heat-melting metal is coated on at least one of the inner peripheral surface of the shaft fitting hole and the outer peripheral surface of the shaft tip portion before they are fitted to each other by subsequently cooling and hardening the same again. How to connect the golf club head and shaft. 7. A particulate metal that is melted by heat is adhered to at least one of the inner peripheral surface of the shaft fitting hole and the outer peripheral surface of the shaft tip portion before fitting with each other, and then this is heated and melted. The heat-melting metal is coated on at least one of the inner peripheral surface of the shaft fitting hole and the outer peripheral surface of the shaft tip portion before they are fitted to each other by cooling and hardening the same again. A method for connecting a golf club head and a shaft as described. 8. A metal that melts by heat is coated by plating on at least one of the inner peripheral surface of the shaft fitting hole and the outer peripheral surface of the shaft tip before fitting with each other.
A method for connecting a golf club head and a shaft according to [4]. 9. A method for connecting a golf club head and a shaft, wherein a tip portion of a shaft is inserted into a shaft fitting hole of a golf club head so as to fix the both, and an inner peripheral surface of the shaft fitting hole before being fitted to each other. A metal layer integrally fixed to the outer peripheral surface of the shaft and the tip of the shaft, and at least one surface of these metal layers is coated with a heat-melting metal in a cured state. A golf club characterized in that it is inserted into a shaft fitting hole of a golf club head, and then the coated metal is heated to melt it, followed by cooling and hardening to fix the golf club head and the shaft together. How to connect the head and shaft. 10. At least one of both metal layers is formed by depositing a heat-melting particulate metal on at least one surface of the both metal layers, then melting the metal, and then cooling and hardening the metal again. The golf club head and shaft coupling method according to claim 9, wherein the surface of the golf ball is coated with a heat-meltable metal. 11. The method for coupling a golf club head and a shaft according to claim 9, wherein the surface of at least one of the both metal layers is coated with a metal that melts by heat by plating. 12. A method for connecting a golf club head and a shaft, wherein a tip portion of a shaft is inserted into a shaft fitting hole of a golf club head so as to fix the both, and an inner peripheral surface of the shaft fitting hole before being fitted to each other. And an outer peripheral surface of the shaft tip portion are integrally fixed to each other, and a sheet-shaped metal that is melted by heat is wound around the outer peripheral surface of the metal layer fixed to the shaft tip portion, and the shaft tip portion is fixed in that state. Insert into the shaft fitting hole of the golf club head,
Next, the sheet metal is heated to melt it,
Then, the golf club head and the shaft are integrally fixed by cooling and hardening the golf club head and the shaft. 13. A method for connecting a golf club head and a shaft, wherein a tip end portion of a shaft is inserted into a shaft fitting hole of a golf club head so as to fix the both, and an inner peripheral surface of the shaft fitting hole before being fitted to each other. A metal layer is integrally fixed to the outer peripheral surface of the shaft and the tip of the shaft, and a sheet-shaped metal that is melted by heat is fixed to at least one surface of these metal layers. A golf club head, characterized in that the golf club head is inserted into a shaft fitting hole of a head, the sheet metal is heated to melt the metal, and then the metal is cooled and hardened to integrally fix the golf club head and the shaft. And how to connect the shaft. 14. A method for connecting a golf club head and a shaft, wherein a tip end portion of a shaft is inserted into a shaft fitting hole of a golf club head to be fixed to each other, the inner peripheral surface of the shaft fitting hole before being fitted to each other. A metal layer integrally fixed to the outer peripheral surface of the shaft and the tip of the shaft, and a particulate metal that is melted by heat is attached to at least one surface of both metal layers. A golf club head inserted into the shaft fitting hole of the golf club, and then heating the adhered particulate metal to melt it, followed by cooling and hardening to solidify the golf club head and the shaft. How to connect the head and shaft. 15. A method for connecting a golf club head and a shaft, wherein a tip end portion of a shaft is inserted into a shaft fitting hole of a golf club head to be fixed to each other, the inner peripheral surface of the shaft fitting hole before being fitted to each other. A metal layer integrally fixed to the outer peripheral surface of the shaft and the tip of the shaft, and at least one of these metal layers is made of a metal that is melted by heat. The method of coupling a golf club head and a shaft, wherein the golf club head and the shaft are integrally fixed to each other by heating the metal that is melted by heat to melt the metal, and subsequently cooling and hardening the metal. . 16. The heat-melting metal used is a metal that generates heat when energized and is melted by the heat, and an electric current is supplied to the metal to melt the metal. A method for connecting a golf club head and a shaft as described. 17. The heat-melting metal is a metal that generates heat when energized and is melted by the heat. In addition to the heat-melting metal between the shaft fitting hole and the shaft tip, The insulating layer is interposed between the golf club head and the shaft so as to allow a local current flow between the golf club head and the shaft through the metal, and the insulating layer is interposed between the golf club head and the shaft. 17. The method for coupling a golf club head and a shaft according to claim 1, wherein an electric current is passed through the cut portion of the layer and the heat-melting metal to melt the metal. 18. The method of coupling a golf club head and a shaft according to claim 17, wherein the cutout portion of the insulating layer is filled with a conductive material. 19. The heat-melting metal is heated by a heater to melt the metal.
A method for connecting a golf club head and a shaft according to item 6. 20. The heat melting metal is 150 ° C. to 6 ° C.
The golf club head and shaft coupling method according to any one of claims 1 to 19, wherein the metal is a metal that melts at a temperature of 00 ° C. 21. A tip portion of a shaft is formed in a taper shape which is tapered toward the tip thereof, and a shaft fitting hole is formed in a taper shape corresponding to the taper shape of the tip portion of the shaft. 21. A method for connecting a golf club head and a shaft according to any one of Items 1 to 20. 22. At least one of an inner peripheral surface of a shaft fitting hole and an outer peripheral surface of a shaft tip portion inserted therein,
22. The method for coupling a golf club head and a shaft according to claim 1, wherein the golf club head and the shaft are subjected to storm treatment. 23. The blast process is applied to at least one surface of both metal layers fixed to the inner peripheral surface of the shaft fitting hole and the outer peripheral surface of the shaft tip end portion. A method for connecting a golf club head and a shaft according to item 6.