JPH05507227A - How to manufacture golf club handles - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] How to manufacture golf club handles The present invention relates to the manufacture of golf club handles, and more particularly to novel handles made of composite materials. Manufacturing method, and apparatus for carrying out this method, and products manufactured by this method It is related to the pattern that was created.

Plastic tubing, such as fishing rods or golf clubs, reinforced with carbon fiber or other materials The manufacturing method is described in British Patent No. 1.446.444 and United States Patent No. No. 4.555.113.

In this method, for example, a thin sheet (i.e. fiber cloth) pre-impregnated with epoxy resin is used as a matrix. wrapped around the ribbon, then wrapped with a polyester heat-shrinkable film. Never compact this laminate. Next, the mandrel coated in this way is , caused on the one hand by heating the composite coating and on the other hand by shrinkage of the film. The mandrel is placed in a furnace to compact the coating around the mandrel under pressure. most Later, after the resin has hardened, the mandrel is extracted and the ribbon is then peeled off, generally Surface irregularities left by the movement of the ribbon, called steps (i.e. The trace J) is removed by polishing during the finishing work of the handle.

A variant implementation of this method involves winding a thread pre-impregnated with resin. There are other ways to coat the mandrel.

These methods, which are very popular among manufacturers, still Since the reproduction of mechanical characteristics cannot be guaranteed, golf players, especially high-level golf players, It does not give players complete satisfaction.

The major differences in the performance of Nari Love, as revealed by professional golfers, are , especially from the removal of material during the operations necessary for finishing the handle.

European Patent Application No. 311400 produces a cylindrical tube made of composite material METHODS AND APPARATUS. This method involves a composite tube containing an inflatable inner sac in a cylindrical material. Because the materials are brought into close contact with each other, and all of this is inserted into a mold to form a single piece. Become. This sack is placed in contact with the wall of the mold during the casting process and crosslinking process. Pressure is applied to press the composite material.

U.S. Pat. No. 1,740.144 expands under internal fluid pressure and Nitrocell, such as biloxylin, from a cylindrical tube that matches the mold engraving. Concerning how to make a rose pattern.

These methods, for example, can This significantly limits the possibility of manufacturing cone-shaped handles, inverted cone-shaped handles, etc.).

The object of the present invention is to be able to produce patterns with multiple shapes made of continuous layers of fiber cloth, and to improve reproducibility. It is an object of the present invention to provide a manufacturing method that can be easily carried out.

Another object of the present invention is that the handle can be taken out in an accurate finished state by the casting operation. The purpose is to do so.

Other objects of the invention are those which cannot be produced with currently known technology or which It is difficult to manufacture complex shaped handles with uniform mechanical properties.

Therefore, the object of the present invention is to provide a method for manufacturing a golf club handle made of a composite material. The process includes the following consecutive steps:

i.e.: i) First, make a hard mandrel with at least the same length as the handle to be made. A tubular elastomer sack having elasticity and barrier properties is arranged around: if ) Next, the mandrel is covered with a composite structure containing fibers impregnated with an organic resin matrix. stomach: Hi) Inside the mold that has a cavity (engraved mold) that defines the final shape of the handle to be manufactured, Place the mandrel coated using the above method: iv) Finally, for the purpose of compacting the composite structure against the mold engraving, between the shaped sack and the mandrel by introducing a fluid into the interior of the sack. Casting is carried out by applying the internal pressure generated by the process.

A feature of this method is that the mandrel has a variable cross section over at least a large part of its length. On this mandrel, a A thin sack is provided and this sack is made in advance by dipping.

In a preferred embodiment of the invention, the tubular sack can be used by dipping. Made of elastomer.

The invention also relates to an apparatus for carrying out the method.

Finally, the present invention relates to a golf club handle manufactured by a one-piece method. Ru Other objects, advantages and features of the invention can be seen, by way of non-limiting example, with reference to the attached drawings. It will become clear from the following description of the embodiments of the present invention. FIG. 1 is a front view showing a golf club fitted with a handle manufactured according to the method of the present invention. figure.

FIG. 2 shows a golf club with an alternative handle manufactured according to the method of the present invention. Side view.

3 to 8 are diagrams showing various steps of the method for manufacturing a handle according to the present invention.

FIG. 9 is a partially detailed view of a casting apparatus for carrying out the method according to the invention.

FIG. 1O is a detailed vertical cross-sectional view of the same device as FIG. 9.

FIG. 11 is a cross-sectional view of the device shown in FIG. 10, taken along line B-B.

FIGS. 12 and 13 are diagrams showing examples of patterns produced by the method of the present invention.

Figure 14 depicts an embodiment of the handle of Figure 13 incorporating a handle and a filling ring. Figure.

As shown in the first @, a golf club usually consists of 1, a head 2, a handle 11s3, and a "grip". 4. And, if necessary, mainly connect the head and handle. The handle 3 (i.e. A "shaft") is not just a tube with a constant cross-section (more generally, a maximum It is a conical tube whose cross section lies at the level of the grip 4. However, Fig. 2 and especially for a club called "butter", as shown in , the handle 3 has an inverted conical narrow part 3b at a lower part than the main part 3a of the handle. The handle 3 according to the present invention may contain a composite material (in particular, a polymerized organic resin). manufactured by IIM) immersed in The longitudinal stress of deflection is basically while being received by fibers disposed longitudinally along the axis I-I of 3. , the torsional stress is absorbed by the fibers wound approximately along the circumference. Club's wishes Depending on the desired characteristics, the longitudinal fibers are wound (or formed against longitudinal stress). Select the ratio of fibers (with an angle that

Preferred embodiments of the method according to the invention are shown in FIGS. 3 to 8. The elastic material has a length that is preferably at least equal to the desired length of the handle. A first step of manufacturing a tubular sack 8 is included.

Preferably, the sack is made of an elastomer that can be used by dipping. This technique is especially useful for separating thin rubber gloves, sacks, and other items with complex shapes. The basic characteristics known and recognized by those skilled in the art include good aptitude for stretching. One device that can be utilized within the scope of the present invention is one that is completely resistant to heat and gases and liquids. Examples of elastomers include latex, neorene, or silicone elastomer. Tomah can be taken as an example. The use of latex sacks is preferred by the applicant. It is considered to be the best.

For this purpose, a coagulation bath of, for example, calcium nitrate is then applied, as shown in Figure 3. A member (ie, a mold rod) 6 is used which is immersed in a TEX bath 7. After solidification, sack 8 undergoes a heating step at 70°C to 80°C for about 10 minutes. With this technology, approximately 0 ．． It becomes possible to obtain thin sacks of 2 to 0.3 ml. After cooling, manufacture The support is placed on a hard casting mandrel 9 having at least the same length as the length of the handle. Place the rack.

The next step, shown in Figure S, is to cover the mandrel 9 with a fiber cloth impregnated with an organic resin. 1 Materials used within the scope of the invention comprising 1 e.g. HEXCEL-G Pre-impregnated with ENIN T6T-135 type or T6M-135 type epoxide carbon am. Of course, this method can also be applied to glass fibers, aramid fibers, etc. It can be applied to the casting of handles using other fibers.

The mandrel 9 is coated with a spread of fiber cloth oriented according to the desired properties. This is done by wrapping the In this way, the truncated cone of multiple layers of textile fabric A shaped composite structure 11 is obtained.

Of course, the mandrel can be coated with one or more threads pre-impregnated with resin. It can also be done by attaching a

Formed and 116+! The mandrel 9 shown in l is thus pre-impregnated. It is covered with a covering 11 composed of 12 to 15 layers of fibers stacked together.

As shown in FIGS. 7 and 8, the engraving section 13 then determines the final shape of the handle. A mandrel 9 is placed in a mold 12. FIG. 7 also shows a non-limiting example of the invention. In the figure, the carved part 13 has two areas 13a and 13b defined by a plane P, The conical shape faces in opposite directions on both sides of this plane. Generally, the mold The portion 13 has a contrasting shape of the area formed at the desired location of the handle during casting. for■e) may have a bulge or constriction area. 0 The method of the present invention uses a simple conical mantle to cast handles of different shapes. Enables use of drell. On the one hand, from a technical point of view this possibility On the other hand, it is difficult to produce mandrels with rough shapes, and on the other hand, it is not economical. Generally speaking, one type of mandrel can be used to fit many different mold shapes. This provides a large profit as only a small amount is required.

The end through which the part of the mandrel 9 which is not completely covered by the sack 8 passes through. A recess (i.e., a shoulder for centering) 12a is formed at the end of the mold 12 opposite to the You may also do so.

The casting operation involves heating the mold and inserting the composite structure 11 into the mold part 13 of the mold 12. By introducing gas into the inside of the elastic sack 8, the material is compacted. The casting cycle, which is carried out by applying the internal pressure created by the Depends on the nature and reactivity of the material. - For example, for epoxide pre-metal pickles. For contrast, the mold is heated to 150° C. and then cooled to ambient temperature. heating and Cooling times are 15 and 10 minutes, respectively. Pressure is 40℃ during heating stage to 50°C, and maintain it stably until the end of the casting cycle. Ru.

For this purpose, compressed air with a pressure of approximately 3 to 4 bar is used.

Figure 8 shows the mandrel after injecting a compressed fluid such as compressed air into the inside of the sack. After opening the mold, the mandrel 9 is caused by compaction and is surrounded by the composite structure 11. Just because there is a space that appears between Dorell 9, you can do it without any special tools. Can be taken out easily.

Figures 9-11 illustrate one particular embodiment of the mold shutoff system and fluid supply. The mandrel 9 is made up of two parts 91, 92, one partially fitting into the other. One of them is an auxiliary member 92 for supplying compressed fluid, which supports the composite structure 11. Attachment is added to the other conical main member 91 which is held. The secondary member 92 is the mold 12 Wedge-fixing the sack 8 against the rotating surface 12b having a complementary shape to the entrance of the This realizes blocking of the sack. For this purpose, the edge of sack 8 is attached to a mandrel. 9 extends beyond the conical main member 91 and the sac extends beyond the frustoconical main member 91 of the secondary member 92. to cover the front tubular portion 92a inserted into the mold 12, and the circle The edge 92d of the upper base of the frustum is pressed against the end of the lower base of the conical main member 91.

The wedge fixation of the sack is performed between the surface of the conical portion 92a of the secondary member 92 and the wall surface 12a of the mold 12. It is carried out between.

An additional secondary member 92 includes an axial bore connected to an external source of gas. 92b passes through it. To supply compressed fluid to the inside of the sack 8, as shown in FIG. It is preferable to provide this at the upper bottom edge 92d of the conical portion 92a of the sub member 92. This is preferably carried out through one or more supply holes 92c.

The main member 91 has an axial projection 91a for positioning that extends into the boring of the sub member 92. It is advantageous to make it extend out. This positioning protrusion 91a is preferably , one or more through the bore of the added secondary member 92 to allow passage of fluid. Finally, the integral connection of the main member 91 within the secondary member 92 includes a flat plate of This can be done by a button 93 or by other means.

Figure 12 right and Figure 13 show a slightly conical cylindrical model manufactured according to the present invention. This method shows transition areas such as a bulge area 31 or a constriction area 32. allows the formation of these transition zones while preserving the continuity of the textile layers in the This provides uniform mechanical properties from the top to the bottom of the handle, and therefore the handle assembly. gives a good reproduction of the characteristics of Accurate finishing with no rework required You can also get the status.

These areas may be used, in particular, for example to define special deformed cross-sectional contours or on the club for the purpose of transferring the club's moment of inertia without increasing the amount of Depending on the situation, it will be realized in different places.

Finally, these areas are where the constriction is created, for example as shown in Figure 5. The role of incorporating a grip (i.e. a “grip”) that is flush with the surface of the handle also. Also, a plastic or metal ring may be formed at the constriction. It is also possible to consider filling the space. Depending on the nature and characteristics of the materials used. As such, this ring may be involved in cushioning or balancing the club.

FIG. 14 shows the constriction area 32 covered by 1l 140 and the built-in area adjacent to this ring. ff140, which is an example of the handle 3 equipped with a grip 4, is a metal weight, for example. Alternatively, the buffer member may be made of a viscoelastic material.

The bulge can be used as a register element for marking, for example. Can be done.

Of course, the invention lies in some aspects of the embodiments which have been described and illustrated by way of example only. It is not limited either.

In particular, one invention is carried out in accordance with the spirit thereof and used within the scope of the following claims. insofar as possible, all means constituting technical equivalents of the means listed above and and combinations thereof.

international search report abstract The present invention relates to a method for manufacturing a golf club handle made of composite material. This method is especially , consists of the following consecutive steps.

In other words, - Use a hard mandrel that has the same length as the length of the handle you are trying to make. A tubular sack with elasticity and barrier properties is arranged around the knee. This mandrel is covered with a composite structure containing fibers impregnated with a synthetic resin matrix. - Introducing fluid into the inside of the knee sack in which the coated mandrel is placed inside the mold. The casting process is performed by applying internal pressure.

Drawing for summary document Figure 7 international search report

Claims (10)

[Claims] 1. i) First of all, it has at least the same length as the length of the pattern to be made. A tubular elastomer with elastic and barrier properties is placed around the hard mandrel (9). ii) then a fiber impregnated with an organic resin matrix; covering said mandrel (9) with a composite structure (11) comprising; iii) It has a carving mold (13, 13a, 13b) that defines the final shape of the handle to be produced. disposing the coated mandrel in a mold (12); iv) Finally, the composite structure (11) is placed in the mold (13, 1) of the mold (12). 3a, 13b) with said tubular sack and said mandrel ( 9) Applying internal pressure generated by introducing fluid into the inside of the sack The manufacturing process of composite golf club handles involves a continuous process in which casting and forming operations are carried out. In a manufacturing process, a mandrel whose cross section varies over at least a large part of its length (9), and on the mandrel have the same shape as the mandrel. A thin sack (8) may be provided and the sack may be prepared in advance by dipping. A method characterized by: 2. The tubular sack is made of latex or neorene. A manufacturing method according to claim 1. 3. The composite structure (11) is made of thermosetting resin around the mandrel (9). A claim characterized in that it is produced by wrapping a fiber cloth impregnated with A manufacturing method according to Range 1 of 4. The composite structure (11) is made of one or more fibers pre-impregnated with a thermosetting resin. Claim 1, characterized in that it is produced by winding a plurality of threads. manufacturing method. 5. Claim 3 or 4, characterized in that the resin used is an epoxide type. manufacturing method. 6. The composite structure (11) is made of glass fiber, carbon fiber, or aramid fiber. A manufacturing method according to claim 1, 3, 4 or 5, characterized in that: 7. First of all, around the hard mandrel (9), there is an elastic and barrier Arranging an elastomer sack (8); then covering said mandrel (9) with a composite structure (11); disposing the coated mandrel within a mold (12); Next, internal pressure generated by introducing fluid into the sack is applied to perform casting. A method of manufacturing a golf club handle made of composite materials, which consists of a continuous process in which shaping operations are carried out. In the device for carrying out the method, said mandrel (9) has at least its length. having a cross section that varies over a large part of the length and the thickness of said sack (8); 1. A device characterized in that the mandrel is thin and has the same shape as the mandrel. 8. The mandrel (9) has two members (91, 9) partially fitted into each other. 2), one of which has a conical shape for supporting the composite structure (11). a main member (91), the other is added to the main member (91), and a sub-section pierced by a boring section (92b) connected to an external source of fluid under pressure; 8. Device according to claim 7, characterized in that it is a material (92). 9. The added secondary member (92) is covered with the sack (8) and is placed inside the mold. a truncated conical front part (92a) inserted into the socket; The inlet part of said mold (12) has a complementary shape that achieves the barrier properties of said mold (12). Device according to claim 8, characterized in that it is supported on a rotating surface (12b). 10. A continuous layer of fibrous fabric has one or more bulge areas (31) and/or Any one of claims 1 to 6, characterized in that it comprises a fin area (32). A golf club handle manufactured by the method.