JP2023082639A - Billiard cue manufacturing method - Google Patents

Abstract

To manufacture a billiard cue capable of solving the problems of a shaft of the conventional billiard cue where vigorously hitting a cue ball in a predetermined direction and using the shaft for a long period of time are slightly difficult and strange sound is caused by use for a long time.SOLUTION: A billiard cue manufacturing method includes: providing a hollow hole on a shaft of a billiard cue; as a core material to be inserted thereto, manufacturing a pipe made from fiber-reinforced composite material having a structure having partially different rigidity in a longer direction and composed of glass fibers and carbon fibers whose rigidity difference is large, using integral molding for performing bonding and molding at the same time; manufacturing a core material having foam synthetic resin buffer material filled in a hollow of the pipe and inserting the core material into the hollow hole of the shaft; and fixing the wooden shaft and a wooden bat using a detachable device.SELECTED DRAWING: Figure 2

Description

The present invention relates to a method for manufacturing a billiard cue consisting of a shaft and a bat.
In particular, the billiard cue shaft has good controllability of the bending of the shaft when hitting a ball, and has a structure that does not break the internal structure even when used for a long time and does not emit abnormal noise to the outside. It relates to the manufacturing method of

A conventional billiard cue is one in which six pieces of columnar wood cut into a fan-shaped cross section (pie-shaped) are inserted in the longitudinal direction of the hollow part of the shaft (see Patent Document 1 below: JP-A-11-502428). .

However, with the shaft of the billiard cue disclosed in JP-A-11-502428, when the cue ball is struck with the tip of the shaft, it is somewhat difficult to bend the shaft and control the cue ball. There was a problem that it was difficult to strike strongly.

Japanese Patent Publication No. 11-502428

An object of the present invention is to solve the above-mentioned problems, and to provide a billiard cue manufacturing method that allows the cue ball to be hit in a predetermined direction with a predetermined force when the cue ball is hit with the tip of the shaft.
The invention also provides a method for manufacturing a billiard cue having a billiard cue shaft having a structure that does not break the internal structure even when used for a long period of time and does not emit abnormal noise to the outside.

In the present invention, a hollow hole is provided in the shaft of a billiard cue, and a core material is inserted. and carbon fiber, integrally molding these fiber-reinforced composite material pipes, using a core material filled with foamed synthetic resin cushioning material in the hollow of the pipe, and this wood shaft and the wooden bat are fixed by the detachable tool, the billiard cue having a structure that does not break the internal structure even if used for a long time and does not emit abnormal noise to the outside can be manufactured. It was possible.

The present invention is a method of manufacturing a billiard cue having the structure described in (A) to (C) below as a product.
(A) A cylindrical, tapered wooden shaft is provided with a hollow hole having a circular cross section penetrating from the front end to the rear end, and a short hole is inserted in the hollow hole of the shaft from the front end. The prepregs are arranged and laminated in the order of glass fiber reinforced plastic, long carbon fiber reinforced plastic, and long glass fiber reinforced plastic, and are integrally molded into a hollow fiber reinforced composite pipe. A billiard cue comprising a wooden shaft having a core material filled with a cushioning material made of foamed synthetic resin having a circular cross section and a wooden bat fixed by a detachable tool.
(B) A cylindrical, tapered wood shaft is provided with a hollow hole having a circular cross section penetrating from the front end to the rear end, and the hollow hole of the shaft is provided with an externally elongated body extending from the front end. The prepregs are arranged in order of glass fiber reinforced plastic, long carbon fiber reinforced plastic, and short glass fiber reinforced plastic. A billiard cue characterized by comprising a wooden shaft having a core material inserted therein filled with a cushioning material made of foamed synthetic resin having a circular cross section and a wooden bat fixed by a detachable tool.
(C) A cylindrical, tapered wood shaft is provided with a hollow hole with a circular cross section penetrating from the front end to the rear end, and a long carbon fiber is placed in the hollow hole of the shaft. A pipe made of fiber-reinforced composite material is integrally formed by arranging and laminating the prepregs in order of fiber-reinforced plastic and short glass-fiber-reinforced plastic at both ends. A billiard cue characterized in that a wooden shaft with a core material filled with a long foamed synthetic resin cushioning material inserted therein and a wooden bat are fastened with a detachable tool.
It should be noted that the above-mentioned "in appearance" means, as described in Claims 1 and 2 of the scope of claims of the present invention, when manufacturing a fiber-reinforced composite material pipe, the mandrel (shaft) ) is laminated by winding a glass fiber prepreg sheet with a long width on a carbon fiber prepreg sheet with a relatively short width. The plastic is transparent or translucent, which means that visually it appears to be juxtaposed with the carbon fiber reinforced plastic (black) underneath.

A method for manufacturing the above products (A) and (B) will be described.
Steps (1) to (5) below:
(1) A hollow hole with a circular cross section is provided in a cylindrical and tapered wood shaft through from the front end to the rear end,
(2) Separately, a carbon fiber prepreg sheet with a relatively short width and a length of width, in which carbon fiber and glass fiber, which are fibers with different rigidity, are impregnated with the same type of thermosetting resin A long glass fiber prepreg sheet is wound around a metal mandrel (mandrel) with a circular cross section in such a manner that the widths of the glass fiber prepreg sheet portions that protrude from both ends of the carbon fiber prepreg sheet have different lengths. After winding it so that it is laminated, a synthetic resin tape is further wrapped around the outside of the whole and pressurized to adhere and densify the whole while heating and curing the whole. The longitudinal rigidity is partially different by the process of pulling it out, peeling off the tape, and shaving the outside so that the outer diameter fits into the hollow hole of the wooden shaft manufactured in the above step (1). Manufactures fiber-reinforced resin composite material pipes with a structure and integrally molded circular cross-section,
(3) manufacturing a core material by filling a cushioning material made of foamed synthetic resin into the hollow of the pipe made of fiber-reinforced resin composite material;
(4) inserting the core material into the hollow hole of the wooden shaft produced in step (1);
(5) fixing the wooden shaft and the wooden bat with a detachable tool;
A method for manufacturing a billiard cue, characterized by comprising:
The product (A) is the above product (A) with the short side of the above "width of the glass fiber prepreg sheet portion" facing the tip of the shaft, and the longer side of the width facing the tip of the shaft. The resulting product (B) is obtained.
By using the same fiber-reinforced resin composite material pipe as the core material by turning the rear end upside down, it is convenient because the flexibility and usability of the shaft can be easily adjusted.

A method for producing the above (C) product will be described.
Steps (1) to (5) below:
(1) A hollow hole with a circular cross section is provided in a cylindrical and tapered wood shaft through from the front end to the rear end,
(2) Separately, a carbon fiber prepreg sheet with a relatively short width and a length of width, in which carbon fiber and glass fiber, which are fibers with different rigidity, are impregnated with the same type of thermosetting resin A long glass fiber prepreg sheet is wound around a metal mandrel (mandrel) with a circular cross section in such a manner that the width of the glass fiber prepreg sheet part protruding from both ends of the carbon fiber prepreg sheet is the same length. After winding it so that it is laminated, a synthetic resin tape is further wrapped around the outside of the whole and pressurized to adhere and densify the whole while heating and curing the whole. The longitudinal rigidity is partially different by the process of pulling it out, peeling off the tape, and shaving the outside so that the outer diameter fits into the hollow hole of the wooden shaft manufactured in the above step (1). Manufactures fiber-reinforced resin composite material pipes with a structure and integrally molded circular cross-section,
(3) manufacturing a core material by filling a cushioning material made of foamed synthetic resin into the hollow of the pipe made of fiber-reinforced resin composite material;
(4) inserting the core material into the hollow hole of the wooden shaft produced in step (1);
(5) fixing the wooden shaft and the wooden bat with a detachable tool;
A method for manufacturing a billiard cue, characterized by comprising:

The billiard cue manufactured by the manufacturing method of the present invention, which is the product described in the above (A) to (C), is a core material of a wooden shaft, which is "a hollow inside of a pipe made of an integrally molded fiber-reinforced composite material. One of the features is a wooden shaft with a core material filled with cushioning material made of foamed synthetic resin.
In this way, the core material of the wooden shaft is manufactured by filling a long cushioning material of foamed synthetic resin from the tip, so that the shock given to the wooden part of the shaft during use is softened, To prevent damage to wooden parts, to stably use the billiard cue for a long period of time, and to prevent abnormal noise from being generated outside even if the billiard cue is used for a long period of time.
Furthermore, in the present invention, the carbon fiber reinforced plastic as the core material and the glass fiber reinforced plastic at both ends thereof are laminated by winding them around a mandrel using prepreg impregnated with the same type of thermosetting resin. Because it is manufactured, in the next process, if the whole is wrapped with synthetic resin tape and pressurized and densified, the same type of resin will blend in and mix to some extent, so if you heat and harden the whole , the same kind of thermosetting resin also acts as an adhesive (without using any other adhesive), and can be manufactured as an integral molding in which adhesion and molding are performed at the same time.
Therefore, there is an effect that it is possible to manufacture a strongly integrated core material having a structure in which the rigidity in the longitudinal direction is partially different.
The present inventors previously used each molded reinforced plastic pipe (finished product) as the core material, and used a short carbon fiber reinforced plastic pipe inside the glass fiber reinforced plastic pipe with an adhesive. However, since the preformed pipes are attached later, it is difficult to place them in any position, and the billiard cue During use, the adhesive peeled off, causing abnormal noise and lack of quality stability such as flexibility.
The core material manufactured by the present invention is strong because it is integrally formed by simultaneous molding and bonding, rather than being bonded later, and positioning is easy because it is performed at the prepreg stage. have the effect of being

Here, taking the above product (A) as an example, the effect of actual use will be described. Although it is a fiber reinforced plastic, since the glass fiber reinforced plastic has less rigidity than the carbon fiber reinforced plastic, the impact given to the wooden shaft is small, and the billiard cue can be used stably for a long period of time. Then, billiard pros and advanced players can hit the cue ball with a slightly smaller force at first while the shaft is lightly stabilized for a short period of time.
In addition, professionals and advanced players use the characteristics of long carbon fiber reinforced plastics with high rigidity, and by hitting the cue ball with great force, the shaft bends greatly and tries to return to its original repulsive force, pushing out strongly. Since the force is applied to the cue ball, it is possible to hit the cue ball strongly with a large force combined with the force of pushing out with the arm when hitting the billiard cue (see Fig. 3).
Beginners of billiards cannot hit the cue ball in the desired direction at first, so they cannot use the bending of the shaft to curve the cue ball in the intended direction. Gradually, you will be able to hit the cue ball by bending it in a planned direction. At this time, since the core material of the shaft is filled with cushioning material made of foamed synthetic resin, it is possible to prevent beginners from damaging the wood shaft. Since it is absorbed, even if the billiard cue is used for a long time, there is also an effect that no abnormal noise is generated outside.

As described above, the billiard cue manufactured by the present invention can easily adjust the length of the core material made of glass fiber reinforced plastic by the manufacturing method of the present invention. , has the effect of being able to be controlled to match the experience, technique, and taste of each advanced user. Furthermore, according to the manufacturing method of the present invention, since the carbon fiber reinforced plastic and the glass fiber reinforced plastic, which are the core materials of the shaft, are integrally molded, it is possible to strengthen the shaft. The cushioning material of foamed synthetic resin is filled with a long length to soften the impact on the wooden part of the shaft during use and prevent damage to the wooden part of the shaft, so you can use the billiard cue stably for a long time. In addition, since the sound is absorbed by the cushioning material, even if the billiard cue is used for a long time, there is an effect that no abnormal noise is generated outside.

As mentioned above, the use of a high-strength core material produced by integral molding according to the present invention has the advantage of increasing the degree of freedom in terms of shaft hardness and taper fineness. rice field.
When each end face of each molded reinforced plastic (molded product) is glued later with an adhesive, there was a high frequency of cracks in the glued parts and defects occurred when the shaft was bent. Since the integrally molded product produced by the invention has improved strength, almost no problems occur.
Current users tend to prefer shafts with a narrower taper, but the new, integrally molded, high-strength material produced by the present invention enables the production of shafts with a thinner taper than ever before. Moreover, by making it thinner, it has the advantage that problems are less likely to occur even if more bending occurs.

As the wood for the shaft used in the present invention, any of the woods commonly used for shafts (eg, maple, ebony, rosewood, etc.) can be used.

As for the material of the mandrel (shaft) used in the present invention, materials such as metal, resin, and ceramic are known, but metal is preferable from the viewpoint of productivity.

As reinforcing fibers, organic fibers such as carbon fibers (carbon fibers), glass fibers (glass fibers), and aramid fibers, and inorganic fibers such as silicon carbide fibers are known. It is preferred to use a combination of carbon fiber and glass fiber.

The thermosetting resins used in the present invention include epoxy resins, polyester resins, vinyl ester resins, phenol resins, polyurethane resins and the like, with epoxy resins being particularly preferred. .

Materials for the synthetic resin tape include polypropylene, polyethylene, polyester, cellophane, polyimide, and the like. Polypropylene and polyester are preferably used because of their well-balanced tape shape.
As the pressurizing means, not only the tape shape but also a tube shape such as a heat-shrinkable tube or a rubber tube can be used.

Examples of foamed synthetic resins used as cushioning materials in the present invention include foamed polyethylene, foamed polystyrene, foamed polypropylene, foamed polyurethane and the like, with foamed polyethylene and foamed polyurethane being particularly preferred.

To explain the "bending" when using a shaft, "bending" occurs when a ball is hit with a billiard cue. As the shaft bends, the rotation speed of the ball increases.
Comparing how the "glass fiber reinforced plastic" and "carbon fiber reinforced plastic" bend in the present invention, the glass fiber reinforced plastic is softer (lower in rigidity) and easier to bend.
However, for the shaft as a whole, various combinations of factors such as the length and position of the glass fiber reinforced plastic, the length and position of the carbon fiber reinforced plastic, and the fineness of the shaft taper result in a variety of bending performance. become.
As for the shaft as a whole, the longer the carbon fiber reinforced plastic, the harder it becomes, and the less flexible the shaft becomes.
Here, an example of "cue ball bending" using bending will be described with reference to FIG.
For example, in order to bend the cue ball 31 to the left of its centerline 32, the properties of the glass fiber reinforced plastic shaft and the long carbon fiber reinforced plastic shaft, which is slightly stronger than that, are utilized to form the cue ball 31 as shown in FIG. Hitting the cue ball with the shaft at a position (hitting point 34A) on the right side of the center line 32 passing through the center 33 of the cue ball 31 with a slightly greater force, the tip of the shaft bends to the right while bending the cue ball to the left. can. In this case, as shown in FIG. 7, the shaft bends greatly (35) and generates a force that pushes the cue ball diagonally to the left. Combined with the power of his time arms, he is able to bend the cue ball and hit it with great force.
It should be noted that FIG. 3 is an explanatory diagram of the force vector due to bending when the shaft is in use, and the relative sizes of the cue ball and the shaft in the diagram are different from the actual case.

1 is a plan view of a billiard cue made in accordance with the present invention; FIG. 1A and 1B are enlarged cross-sectional views of various parts of a shaft manufactured according to the present invention; FIG. 4 is an explanatory view of the shaft manufactured according to the present invention when in use;

EXAMPLES The present invention will be described in more detail with reference to examples below, but the technical scope of the present invention is not construed to be limited by the content of the examples.

(1) As shown in FIG. 1, a billiard cue 6 is composed of a wooden shaft 1 and a wooden bat 5. The cylindrical and tapered wooden shaft 1 has a hollow hole 1A with a circular cross section at the tip. Provided through from the part to the rear end.
(2) Separately, a carbon fiber prepreg sheet with a relatively short width and a glass fiber with a relatively long width are impregnated with the same epoxy resin in carbon fiber and glass fiber, which are fibers with different rigidity. A prepreg sheet is first wound around a thin cylindrical metal mandrel (mandrel) with a circular cross section, and then a glass fiber prepreg sheet is wound on the carbon fiber prepreg sheet, and then from the carbon fiber prepreg sheet. One side of the protruding glass fiber prepreg sheet has a short width and the other side has a long width. After winding 1 to 3 sheets in order to form a layer, a polypropylene resin tape is wrapped around the outside of the whole while applying tension. The whole was cured by heating at 130° C. to 140° C. for about 2 hours while being pressurized to adhere and densify. After the temperature is lowered, the mandrel is pulled out, the tape is peeled off, and the outer side is shaved so that the outer diameter is processed to a size that fits into the hollow hole of the wooden shaft manufactured in the above step (1). A fiber-reinforced resin composite material pipe having a structure with partially different directional rigidity and having a circular cross-section was manufactured.
(3) manufacturing a core material by filling the hollow of the fiber-reinforced resin composite pipe with a cushioning material made of foamed polyethylene;
(4) inserting the core material into the hollow hole of the wooden shaft produced in step (1);
(5) fixing the wooden shaft and the wooden bat with a detachable tool;
A structure that has good controllability of the bending of the shaft when hitting the ball, does not break the internal structure even if it is used for a long time, and does not emit abnormal noise to the outside. A billiard cue having a billiard cue shaft having

The present invention focuses on two materials having different strength and bending effects, i.e., glass fiber and carbon fiber, which are fibers with a large difference in rigidity, as a core material to be inserted into a hollow hole provided in the shaft of a billiard cue. Then, using them, a fiber-reinforced composite material pipe having a structure with partially different rigidity in the longitudinal direction is manufactured by integral molding in which bonding and molding are performed at the same time, and a cushioning foam synthetic resin is inserted in the hollow of the pipe. By manufacturing a core material filled with material, inserting it into the hollow hole of the shaft, and fixing the wooden shaft and the wooden bat with a detachable tool, the bending controllability is excellent. The present invention can be industrially applied because it is possible to manufacture and provide a billiard cue having a structure that does not break the internal structure even when used for a long period of time and does not emit abnormal noise to the outside. is big.

1 wood shaft 5 wood bat 6 billiard cue (whole)
1A Hollow hole in wooden shaft 2A, 2B Hollow glass fiber reinforced plastic 3 Hollow carbon fiber reinforced plastic 4 Cushioning material of foamed synthetic resin with circular cross section 31 Cue ball 32 Line passing through the center of the cue ball 33 Center of the cue ball 34A Hit the cue ball Conflict point 35 Shaft bending (image)
36 Force vector when hitting a cue ball

The present invention is a method for manufacturing billiard cues having structures described in (A) to (C) below as products .
(A) A cylindrical, tapered wood shaft is provided with a hollow hole having a circular cross section penetrating from the tip to the rear end. Fiber reinforced plastic, long carbon fiber reinforced plastic, and long glass fiber reinforced plastic are arranged in this order, and the prepregs are laminated and integrally formed into a pipe made of fiber reinforced composite material. 1. A billiard cue comprising a wooden shaft having a core material filled with a long cushioning material made of foamed synthetic resin, and a wooden bat fixed by a detachable tool.
(B) A cylindrical, tapered wood shaft is provided with a hollow hole having a circular cross section penetrating from the front end to the rear end, and the hollow hole of the shaft is visibly filled with a long glass from the front end. Fiber-reinforced plastic, long carbon-fiber-reinforced plastic, and short glass-fiber-reinforced plastic are arranged in this order. One long pipe with a circular cross section is placed in the hollow of a pipe made of fiber-reinforced composite material that is integrally molded by laminating the prepregs. 1. A billiard cue comprising a wooden shaft having a core material filled with foamed synthetic resin cushioning material inserted therein, and a wooden bat, which are fastened with a detachable tool.
(C) A cylindrical, tapered wooden shaft is provided with a hollow hole having a circular cross section penetrating from the front end to the rear end, and the hollow hole of the shaft is filled with a carbon fiber that is long in the center. The prepregs are arranged in the order of reinforced plastic and short glass fiber reinforced plastic at each end. One long foamed synthetic resin with a circular cross section is placed in the hollow of a pipe made of fiber reinforced composite material integrally molded by lamination. 1. A billiard cue characterized in that a wooden shaft into which a core material is inserted and a wooden bat are fixed by a detachable tool.
In addition, the meaning of the above-mentioned "appearance" is, as described in claims 1 and 2 of the scope of claims of the present invention, when manufacturing a fiber-reinforced composite material pipe, the mandrel (shaft) A glass fiber prepreg sheet with a relatively long width is wrapped around a carbon fiber prepreg sheet with a relatively short width, and the glass fiber prepreg sheet and glass fiber reinforced plastic are laminated. Being transparent or translucent means that the carbon fiber reinforced plastic (black) underneath appears to be juxtaposed visually.

A method for manufacturing the above products (A) and (B) will be described.
Steps (1) to (5) below:
(1) A hollow hole with a circular cross section is provided in a cylindrical and tapered wood shaft through from the front end to the rear end,
(2) Separately, a carbon fiber prepreg sheet with a relatively short width and a length of width, in which carbon fiber and glass fiber, which are fibers with different rigidity, are impregnated with the same type of thermosetting resin A long glass fiber prepreg sheet is wound around a metal mandrel (mandrel) with a circular cross section in such a manner that the widths of the glass fiber prepreg sheet portions that protrude from both ends of the carbon fiber prepreg sheet have different lengths. After winding it so that it is laminated, a synthetic resin tape is further wrapped around the outside of the whole and pressurized to adhere and densify the whole while heating and curing the whole. The longitudinal rigidity is partially different by the process of pulling it out, peeling off the tape, and shaving the outside so that the outer diameter fits into the hollow hole of the wooden shaft manufactured in the above step (1). Manufactures fiber-reinforced resin composite material pipes with a structure and integrally molded circular cross-section,
(3) manufacturing a core material by filling a cushioning material made of foamed synthetic resin into the hollow of the pipe made of fiber-reinforced resin composite material;
(4) inserting the core material into the hollow hole of the wooden shaft produced in step (1);
(5) fixing the wooden shaft and the wooden bat with a detachable tool;
A method for manufacturing a billiard cue, characterized by comprising:
The above product (A) is the above "width of the glass fiber prepreg sheet portion" with the shorter side facing the tip of the shaft, and the longer side facing the tip of the shaft. The product (B) is the above product.
By using the same fiber-reinforced resin composite material pipe as the core material by turning the rear end upside down, it is convenient because the flexibility and usability of the shaft can be easily adjusted.

A method for manufacturing the above product (C) will be described.
Steps (1) to (5) below:
(1) A hollow hole with a circular cross section is provided in a cylindrical and tapered wood shaft through from the front end to the rear end,
(2) Separately, a carbon fiber prepreg sheet with a relatively short width and a length of width, in which carbon fiber and glass fiber, which are fibers with different rigidity, are impregnated with the same type of thermosetting resin A long glass fiber prepreg sheet is wound around a metal mandrel (mandrel) with a circular cross section in such a manner that the width of the glass fiber prepreg sheet part protruding from both ends of the carbon fiber prepreg sheet is the same length. After winding it so that it is laminated, a synthetic resin tape is further wrapped around the outside of the whole and pressurized to adhere and densify the whole while heating and curing the whole. The longitudinal rigidity is partially different by the process of pulling it out, peeling off the tape, and shaving the outside so that the outer diameter fits into the hollow hole of the wooden shaft manufactured in the above step (1). Manufactures fiber-reinforced resin composite material pipes with a structure and integrally molded circular cross-section,
(3) manufacturing a core material by filling a cushioning material made of foamed synthetic resin into the hollow of the pipe made of fiber-reinforced resin composite material;
(4) inserting the core material into the hollow hole of the wooden shaft produced in step (1);
(5) fixing the wooden shaft and the wooden bat with a detachable tool;
A method for manufacturing a billiard cue, characterized by comprising:

The thermosetting resins used in the present invention include epoxy resins, polyester resins, vinyl ester resins, phenol resins, polyurethane resins and the like, with epoxy resins being particularly preferred . The temperature and time for heat curing vary depending on the type of resin. For example, when epoxy resin is used, it is preferable to heat and cure for about 2 hours at 130 to 140° C. (° C.).

1 wood shaft 5 wood bat 6 billiard cue (whole)
1A Hollow hole in wood shaft
2.Glass fiber reinforced plastic 3.Carbon fiber reinforced plastic 4.Foam synthetic resin cushioning material 31.Cue ball 32.Line passing through the center of the cue ball 33.Cue ball center 34A.Bending point when hitting the cue ball 35.Shaft bending ( image)
36 Force vector when hitting a cue ball

Claims (5)

Steps (1) to (5) below:
(1) A hollow hole with a circular cross section is provided in a cylindrical and tapered wood shaft through from the front end to the rear end,
(2) Separately, a carbon fiber prepreg sheet with a relatively short width and a length of width, in which carbon fiber and glass fiber, which are fibers with different rigidity, are impregnated with the same type of thermosetting resin A long glass fiber prepreg sheet is wound around a metal mandrel (mandrel) with a circular cross section in such a manner that the widths of the glass fiber prepreg sheet portions that protrude from both ends of the carbon fiber prepreg sheet have different lengths. After winding it so that it is laminated, a synthetic resin tape is further wrapped around the outside of the whole and pressurized to adhere and densify the whole while heating and curing the whole. The longitudinal rigidity is partially different by the process of pulling it out, peeling off the tape, and shaving the outside so that the outer diameter fits into the hollow hole of the wooden shaft manufactured in the above step (1). Manufactures fiber-reinforced resin composite material pipes with a structure and integrally molded circular cross-section,
(3) manufacturing a core material by filling a cushioning material made of foamed synthetic resin into the hollow of the pipe made of fiber-reinforced resin composite material;
(4) inserting the core material into the hollow hole of the wooden shaft produced in step (1);
(5) fixing the wooden shaft and the wooden bat with a detachable tool;
A method for manufacturing a billiard cue, characterized by comprising: Steps (1) to (5) below:
(1) A hollow hole with a circular cross section is provided in a cylindrical and tapered wood shaft through from the front end to the rear end,
(2) Separately, a carbon fiber prepreg sheet with a relatively short width and a length of width, in which carbon fiber and glass fiber, which are fibers with different rigidity, are impregnated with the same type of thermosetting resin A long glass fiber prepreg sheet is wound around a metal mandrel (mandrel) with a circular cross section in such a manner that the width of the glass fiber prepreg sheet part protruding from both ends of the carbon fiber prepreg sheet is the same length. After winding it so that it is laminated, a synthetic resin tape is further wrapped around the outside of the whole and pressurized to adhere and densify the whole while heating and curing the whole. The longitudinal rigidity is partially different by the process of pulling it out, peeling off the tape, and shaving the outside so that the outer diameter fits into the hollow hole of the wooden shaft manufactured in the above step (1). Manufactures fiber-reinforced resin composite material pipes with a structure and integrally molded circular cross-section,
(3) manufacturing a core material by filling a cushioning material made of foamed synthetic resin into the hollow of the pipe made of fiber-reinforced resin composite material;
(4) inserting the core material into the hollow hole of the wooden shaft produced in step (1);
(5) fixing the wooden shaft and the wooden bat with a detachable tool;
A method for manufacturing a billiard cue, characterized by comprising: 3. The method for manufacturing a billiard cue according to claim 1, wherein the thermosetting resin is one selected from epoxy resin, polyester resin, vinyl ester resin, phenol resin, and polyurethane resin. Winding each so as to form a laminate is first winding the carbon fiber prepreg sheet around the mandrel and then winding one or more glass fiber prepreg sheets on top of it, or first wrapping the glass fiber prepreg sheet around the mandrel. 3. The method for manufacturing a billiard cue according to claim 1 or 2, wherein a carbon fiber prepreg sheet is wound thereon, and one to a plurality of glass fiber prepreg sheets are wound thereon. 3. The method for manufacturing a billiard cue according to claim 1, wherein the foamed synthetic resin is one selected from foamed polyethylene, foamed polystyrene, foamed polypropylene, and foamed polyurethane.

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