JPH0572229B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method of manufacturing a grip for a golf club.

(Prior art) Some grips of this type are made of leather, but they are troublesome to wipe and clean after getting wet.
A rubber grip a as shown in FIG. 6 is often used.

Further, such a grip a is manufactured using a split mold consisting of an upper mold b and a lower mold c, and a core d, as shown in FIG.

(Problem to be solved by the invention) However, when the rubber grip a hits an object,
Since it is made of rubber and has low strength, the grip end e is easily deformed and deteriorates rapidly, and it also receives a direct local impact force from the base end g of the club shaft f, so there is a problem that the grip end e is easily damaged.

Furthermore, conventional rubber grips have problems with weather resistance, and due to natural deterioration, the carbon separates and stains the gloves black and leaves grip marks on the surface of the grip, making them unsightly. There is also the problem that the feeling of fit when gripping is inferior compared to other models.

In addition, in the conventional method for manufacturing rubber grips, the outer shape of the grip a is formed by a split mold consisting of an upper mold b and a lower mold c. There is a problem that a parting line h occurs and the appearance is poor.

Furthermore, in the conventional method for manufacturing rubber grips, as shown in FIG. , c, the cavity occupies a large area on the joint surfaces, so there is also the problem of poor production efficiency.

In view of the above-mentioned problems, the present invention provides a method for manufacturing a grip that can efficiently produce a grip for a golf club that is resistant to damage at the grip end, has excellent weather resistance and a good fit, and does not have parting lines on the outside. The purpose is to provide.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention includes a middle mold in which a core portion having an outer peripheral surface having approximately the same shape as the proximal end of a club shaft is erected, and a grip. An outer mold having an inner circumferential surface having approximately the same shape as the side circumferential surface, and a pot having an inner circumferential surface having approximately the same shape as the top surface of the grip, and a positioning pin protruding from the top surface of the core portion. At the same time, using a mold device having an engagement hole for engaging the positioning pin in the pot, the reinforcing plate having a hole for engaging the positioning pin is fitted into the core. After placing the mold on the upper end of the mold, the inner mold, outer mold, and pot are fitted together, and then silicone rubber material is injected into the cavity formed in the inner space of the inner mold, outer mold, and pot, and processed. The present invention provides a method for manufacturing a golf club grip, which is characterized by sulfur molding.

(Function) The golf club grip obtained by the present invention has a reinforcing plate embedded in the proximal end of the club shaft at the grip end, so that when the grip hits an object, the reinforcing plate moves the grip end against the object. It is possible to strengthen the club shaft from behind, and also to disperse the local impact force on the grip end of the club shaft, thereby preventing the grip end from being damaged.

In addition, since it is made of silicone rubber, it has excellent weather resistance, does not naturally deteriorate and leaves grip marks, and carbon does not separate and stain gloves etc., and the fit when gripping is similar to that of conventional rubber. Better than those made of or leather.

According to the method for manufacturing a grip for a golf club of the present invention, since the side circumferential shape of the grip is formed by one outer mold, a parting line along the joint surface of the mold is formed on the side circumferential surface of the grip. It is possible to obtain a grip with a smooth outer shape without causing any curling.

Further, the reinforcing plate can be easily attached to the positioning pin when fitting the reinforcing plate to the mold device, and the reinforcing plate can be positioned accurately, so that golf club grips can be manufactured efficiently.

(Example) An example of the present invention will be described based on FIGS. 1 to 5.

The mold apparatus used in this example includes a middle mold 3 in which a core part 2 having a small diameter cylindrical outer peripheral surface 1 is erected.
and an outer mold 5 having a cylindrical inner peripheral surface 4 having a larger diameter than the core portion 2. The inner circumferential surface 4 of the outer mold 5 is formed into a tapered shape whose diameter increases upward. Further, above the outer mold 5, a port 7 for accommodating the silicone rubber material A in the recess 6 and a piston 8 for pushing out the silicone rubber material A downward are provided.

A plurality of guide pins 9 are provided upright around the periphery of the inner mold 3, and guide holes 10 that engage with the guide pins 9 are provided in the lower surface of the outer mold 5. Also, a plurality of guide pins 11 are provided on the lower surface of the pot 7,
A guide hole 12 that engages with the guide pin 11 is provided on the upper surface of the outer mold 5.

A sprue 1 is placed at the center of the bottom of the pot 7 for injecting the silicone rubber material A in the recess 6 into the cavity.
3 are provided in the vertical direction. A runner 14 for guiding the silicone rubber material A into the cavity is provided at a portion of the outer mold 5 corresponding to the lower end of the sprue 13.

Reinforcement metal plate (reinforcement plate) 15 used in this example
As shown in FIG. 3, it is disk-shaped and has a slightly larger diameter than the outer diameter of the core part 2. Further, a hole 16 is provided in the center of the reinforcing metal plate 15. This reinforcing metal plate 1
A positioning pin 17 is provided upright at the upper end of the core portion 2 on which the core 5 is placed, and is inserted into the hole 16 of the reinforcing metal plate 15 for positioning.

On the other hand, an engagement hole 18 into which the tip of the positioning pin 17 engages is provided at the center of the lower surface of the pot 7 corresponding to the upper end. Further, a concave portion 19 is formed at the center of the lower surface. This concave surface portion 19 constitutes a cavity together with the outer circumferential surface 1 of the core portion 2 and the inner circumferential surface 4 of the outer mold 5.

Next, a method for manufacturing a golf club grip will be explained.

A reinforcing metal plate 1 is attached to the upper end of the core part 2 of the middle mold 3.
Place 5. At this time, the hole 16 of the reinforcing metal plate 15
is inserted into the positioning pin 17 of the core part 2, and the reinforcing metal plate 15 can be placed in a concentric position with the cylindrical core part 2.

The inner mold 3, outer mold 5, and pot 7 are fitted together as shown in FIG. At this time, the guide pins 9 of the middle mold 3 fit into the guide holes 10 on the bottom surface of the outer mold 5, and the guide pins 11 of the pots 7 fit into the guide holes 12 on the top surface of the outer mold 5, thereby determining the position. It can be performed. Also, the positioning pin 1 of the core part 2
7 engages in the engagement hole 19 of the pot 7.

The silicone rubber material A is accommodated in the recess 6 of the pot 7, and the piston 8 is moved downward. The silicone rubber material A passes through the sprue 13 of the inner mold 3, and then passes through the sprue 13 of the inner mold 3.
is guided to the runner 14 and injected into the cavity.

In the silicone rubber material A, the inner peripheral surface of the grip B is formed by the core portion 2 in the cavity,
The outer mold 5 forms a side peripheral surface. Grip B
Since the inner circumferential surface 4 of the outer mold 5 is continuous without a break, the side circumferential surface of the mold 5 is formed into a smooth curved surface without forming a parting line h as in the conventional example shown in FIG. .

The grip end C is formed by the concave surface portion 19 of the pot 7 and the upper end portion of the core portion 2. At this time, since the reinforcing metal plate 15 is placed on the upper end, the reinforcing metal plate 15 can be buried in the grip end C at the same time as the grip B is formed. Further, since the outer diameter of the reinforcing metal plate 15 is larger than the outer diameter of the core portion 2, its peripheral portion can be securely fixed to the grip B.

After the silicone rubber material A is vulcanized and molded, the pot 7, the outer mold 5 and the inner mold 3 are disassembled into upper and lower parts to obtain a grip B as shown in FIG. In this embodiment, the reinforcing metal plate 15 is placed on the upper end of the core portion 2 so that there is no gap between the reinforcing metal plate 15 and the grip B on the base end 21 of the club shaft 20. When fitted, the proximal end 2
It comes into contact with the end surface 22 of 1.

The grip B is fixed to the proximal end 21 of the club shaft 20 via double-sided adhesive tape and adhesive.

Since this grip B is made of silicone rubber, it is lightweight, and unlike conventional rubber grips, there is no need to mix cork in order to reduce the weight. Moreover, a colorful and brightly colored grip B can be easily obtained.

The present invention can be configured in various ways other than those shown in the above embodiments. For example, grips and reinforcing plates,
The shape of the cavity is not limited to that shown in the above embodiments.

(Effects of the Invention) According to the present invention, it is possible to strengthen the grip end from behind, and also to disperse local impact force on the grip end of the club shaft, thereby preventing the grip end from being damaged. It is a golf club that does not deteriorate and leave grip marks, the carbon does not separate and stick to gloves, etc., and the feel of the golf club is better than conventional rubber or leather ones. A grip can be manufactured.

Further, according to the present invention, it is possible to obtain a smooth outer shape of the grip without forming a parting line along the joint surface of the mold, and to provide an efficient golf club in which the reinforcing plate can be easily attached. The present invention provides a method for manufacturing a grip.

[Brief explanation of the drawing]

Fig. 1 is an exploded side view of a mold used in an embodiment of the present invention, Fig. 2 is a side view showing the state in which silicone rubber material is injected into the cavity, Fig. 3 is a perspective view of the reinforcing plate, Fig. 4 is a perspective view of the grip, Fig. 5 is an exploded perspective view of the mold explaining the direction in which the cavity is formed, Fig. 6 is a perspective view of a conventional rubber grip, and Fig. 7 shows the direction in which the cavity is formed. It is an exploded perspective view of a metal mold explaining the direction in which it is formed. 1... Outer peripheral surface, 2... Core part, 3... Middle mold,
4...Inner peripheral surface, 5...Outer mold, 7...Pot, 1
5... Reinforcement plate, 16... Hole, 17... Positioning pin, 18... Engagement hole, 20... Club shaft,
21...Proximal end, A...Silicone rubber material.

Claims (1)

[Scope of Claims] 1. A middle mold having an upright core portion having an outer peripheral surface having approximately the same shape as the base end of the club shaft, and an inner peripheral surface having approximately the same shape as the side peripheral surface of the grip. an outer mold;
A pot having an inner circumferential surface having approximately the same shape as the top surface of the grip, a positioning pin protruding from the top surface of the core portion, and an engagement hole for engaging the positioning pin in the pot. Using a mold device, a reinforcing plate having holes that fit into the positioning pins is placed on the upper end of the core part in a state where the positioning pins are fitted, and then the inner mold, the outer mold, and the pot are placed. 1. A method for manufacturing a grip for a golf club, which comprises: fitting the grips together, and then injecting a silicone rubber material into a cavity formed in the inner space of the inner mold, the outer mold and the pot, and vulcanizing the grip. 2. The method for manufacturing a grip for a golf club according to claim 1, wherein the reinforcing plate is a metal reinforcing plate.