JP2007117605A - Shaft of billiard cue - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shaft of a billiard cue, sharply and strongly repelling when the tip tolls a ball by making the connecting part to a bat harder. <P>SOLUTION: The connecting part to the bat is made harder, and the shaft 1a of the billiard cue formed by connecting the shaft and the bat is provided with a pipe-like intermediate material formed of hard synthetic resin in the central part of the circular section of the shaft extending in the longitudinal direction. An outer layer material is provided as an outermost layer on the outer layer of the intermediate material, a core material is provided as an inmost layer in a hollow cylindrical part of the pipe-like intermediate material of the connecting part to the bat, and a sound absorbing material formed of soft synthetic resin foam is provided in the hollow cylindrical part of the pipe-like intermediate material of the tip part of the shaft. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a billiard cue shaft formed by connecting a shaft and a bat.

  The billiard cue shaft is located on the tip side of the billiard cue and has a structure that can be detachably connected to the rear end bat, and acts to shoot billiard balls with leather or other material provided at the tip. Have.

  The shaft of a conventional billiard cue is a frustoconical rod-like body with a tapered outer surface that is tapered, and the material is mostly processed wood as a single material. In addition to single materials, cues with a hollow structure or a multilayer structure are also known, but they were mainly formed by processing different types of wooden materials into multiple layers.

  The applicant of the present application has proposed, in JP 2001-070499 A (Japanese Patent Application No. 11-251799: Prior Art 1), a billiard cue stick having a multilayer structure made of the same material of wood. A multilayer structure of different materials has been filed as Japanese Patent Application Laid-Open No. 2001-198256 (Japanese Patent Application No. 2000-10979: Prior Art 2). Furthermore, the present applicant has proposed a billiard cue stick having a hollow portion according to Japanese Patent Application Laid-Open No. 2001-346932 (Japanese Patent Application No. 2000-173898: Prior Art 3). Furthermore, the present applicant has proposed an improved multi-layer billiard cue stick according to Japanese Patent Application Laid-Open No. 2004-105658 (Japanese Patent Application No. 2002-276183: Prior Art 4).

  According to the prior art 1, the applicant of the present application is “a cue stick for billiards characterized in that the butt portion and / or the shaft portion of the cue is composed of an intermediate core material and a peripheral material provided around the intermediate core material”. Is disclosed.

  Further, in Prior Art 2, the billiard cue stick shaft and / or bat is composed of a rod-like body having a multilayer structure made of different materials from the center of the rod to the outer peripheral surface layer, and a through hole is formed at the center of the multilayer structure. A billiard cue stick provided "is disclosed.

Further, in prior art 4, “the shaft and the bat have a multilayer structure, the shaft is composed of a plurality of layers from the center to the peripheral direction, the center layer is made of a lightweight member such as a foamed plastic material, and the outer peripheral layer is made of a hard member. The rod-like body is provided with an adhesive elastic member having adhesiveness and elasticity between the center layer and the outer peripheral layer, and the bat has a plurality of layers from the center to the peripheral direction, and the center layer and the outer peripheral layer are hard. A billiard cue stick characterized by being a rod-like body made of a member and provided with an adhesive elastic member having adhesiveness and elasticity between the center layer and the outer peripheral layer. In addition, the multi-layer structure of the shaft and the multi-layer structure of the bat are different from each other, the shaft is composed of a plurality of layers from the center to the peripheral direction, and the center layer is made of a lightweight member such as a foamed plastic material. This is a rod-shaped body in which a reinforced cylindrical portion is provided on the outer peripheral side, an outer peripheral layer is made of a hard member, and an adhesive elastic member having adhesiveness and elasticity is provided and bonded between the reinforced cylindrical portion and the outer peripheral layer. In addition, the bat has a plurality of layers from the center to the peripheral direction, the center layer and the outer peripheral layer are made of a hard member, and a reinforcing cylindrical portion is provided on the outer peripheral surface of the central layer, and adhesion between the reinforcing cylindrical portion and the outer peripheral layer is improved. There is disclosed a billiard cue stick characterized in that it is a rod-like body formed by providing an adhesive elastic member having elasticity and bonding a reinforced cylindrical portion and an outer peripheral layer.
JP 2001-070499 A JP 2001-198256 A JP 2001-346932 A JP 2004-105658 A

  The cue stick for billiards having a single material, a multilayer structure made of a single material, a multilayer structure made of different materials, or a structure having a hollow has a problem. A single-material billiard cue stick made of only wood is easy to bend, and there is a problem that it is difficult to stabilize the shot due to the difference in rebound and repulsion between the grid direction and the plate direction.

  Also, with multi-layered cue sticks, generally for beginners, beginners, and intermediate players, when the cue hits even slightly away from the center of the ball, the change that is given to the ball increases, making it difficult to control the ball. was there. Therefore, it took a lot of time and effort to enjoy the game interestingly.

  In addition, the billiard cue stick having a hollow portion as in the prior art 3 has a high hitting sound when the ball is struck, and the vibration wave felt by the player's hand when struck is stiff and has a delicate feel. There was a problem that it was difficult to obtain. In particular, if the material of the pipe-like tube was metal, the weight increased and the hitting sound reverberated, and the vibration wave was transmitted strongly to the player's hand, making it difficult to obtain a delicate feel at hand.

In order to solve the above-mentioned problem, a billiard cue shaft structure comprising a shaft and a bat connected,
A pipe-shaped intermediate material made of a hard synthetic resin is provided in the center of the circular cross section of the shaft in the longitudinal direction, and an outer layer material is provided as an outermost layer on the outer layer of the intermediate material,
A core material is provided as the innermost layer in the hollow cylindrical portion of the pipe-shaped intermediate material on the connection side portion with the bat,
A billiard cue shaft is proposed in which a sound absorbing material is provided in a hollow cylindrical portion of a pipe-like intermediate member at the tip side portion of the shaft.

The shaft of the billiard cue according to the 0011 column, wherein the connecting side portion with the bat is about 1/2 to 1/4 of the length of the shaft, and the 0011 column wherein the core material is made of carbon fiber resin. We propose a billiard cue shaft as described or in this column.

Furthermore, it is the structure of the shaft of the billiard cue formed by connecting the shaft and the bat,
A pipe-shaped intermediate material made of hard synthetic resin is provided in the center of the circular cross section of the circular section of the connection side portion with the bat, and an outer layer material is provided as the outermost layer on the outer layer of this pipe-shaped intermediate material, and the pipe-shaped intermediate The core material is provided as the innermost layer in the hollow cylindrical portion of the material,
A pipe-shaped intermediate material made of a hard synthetic resin is provided in the longitudinal direction in the center of the circular cross section of the tip side portion of the shaft, and an outer layer material is provided as an outermost layer on the outer layer of the pipe-shaped intermediate material, and the pipe-shaped intermediate material A sound absorbing material is provided in the hollow cylindrical part of
In addition, a billiard cue shaft is proposed in which an intermediate part is provided between the connecting part of the bat and the tip end part of the shaft, and the intermediate part is composed of the same material as the outer layer material from the center to the outer layer. To do.

  Further, the billet cue shaft described in the column 0013 or the column described in this column is proposed in which the connection side portion with the bat is about 1/2 to 1/4 of the length of the shaft.

Furthermore, it is a shaft of a billiard cue formed by connecting a shaft and a bat,
A pipe-shaped intermediate material made of a hard synthetic resin is provided in the center of the circular cross section of the shaft in the longitudinal direction, and an outer layer material is provided as an outermost layer on the outer layer of the intermediate material,
A core material is provided as the innermost layer in the hollow cylindrical portion of the pipe-shaped intermediate material on the connection side portion with the bat,
While providing a sound absorbing material in the hollow cylindrical portion of the pipe-like intermediate material at the tip side portion of the shaft,
The pipe-like intermediate material has the same outer diameter in the longitudinal direction of the shaft, and the inner diameter of the tip side portion of the shaft is larger than the inner diameter of the connection side portion with the bat. Propose.

  A billiard cue shaft is proposed in which the inner diameter of the pipe-shaped intermediate member of the shaft of the billiard cue described in the column 0015 is divided into a plurality of inner diameter portions and becomes larger toward the tip end portion of the shaft.

  According to the present invention, since it is configured as described above, the base side of the shaft, that is, the connection side portion with the bat is a two-layered hard material consisting of a core material from the center of the circular cross section and a pipe-shaped intermediate material made of hard synthetic resin. Since there is a central material, it is formed with a triple layer together with the outer layer material, and the tip side portion of the shaft is provided with a sound absorbing material made of soft synthetic resin foam etc. in the hollow cylindrical portion of the pipe-like intermediate material, The shaft end portion is relatively more flexible than the butt connection side portion, and the bat connection side portion is harder. Therefore, compared with the shaft of the conventional billiard cue, the tip could repel sharply and strongly when hitting the ball.

  Since the tip end portion of the shaft is more flexible than the connection side portion with the bat, the billiard ball can be strongly rotated by making the tip sharp. Therefore, if the billiard ball is advanced, reverse, and left / right rotated as before, the same rotation will occur even if the billiard ball is hit with a small amount of force, making ball control much easier than before. Became.

  Further, since the sound absorbing material is provided in the hollow cylindrical portion of the pipe-shaped intermediate material made of hard synthetic resin at the tip side portion of the shaft, the hollow cylinder has a sound absorbing property without impairing flexibility and light weight. The ball striking sound resonates within the club, and the vibrations are transmitted to the player's hand, eliminating the drawback of lowering the feel. Furthermore, since the material of the pipe-like intermediate material is not a metal material, the hitting sound is reduced and the transmission of vibration waves is also reduced.

  Furthermore, as in the inventions of claims 7 to 8, the outer diameter of the pipe-like intermediate material is the same over the longitudinal direction of the shaft, but the inner diameter of the pipe-shaped intermediate member is larger at the tip side portion of the shaft than at the connection side portion with the bat. By making the inner diameter larger than the side, i.e., the thickness of the wall of the pipe-shaped intermediate material is relatively thinner at the tip end portion of the shaft than at the connection side portion with the bat, the tip is more It is possible to provide a billiard shaft that has the effect of being lighter and more flexible.

  Further, since the sound absorbing material in the pipe at the tip end portion of the shaft is lightweight, the weight balance of the shaft is not lost.

  FIG. 1 is a front view showing the appearance of a billiard cue shaft, FIG. 2 is a longitudinal sectional view of the billiard cue shaft showing the first embodiment, and FIG. 3, FIG. 4 is a BB cross-sectional view of FIG. 2, FIG. 5 is a partial cross-sectional explanatory view of a shaft of a billiard cue showing the second embodiment, FIG. 6 is a CC cross-sectional view of FIG. 7 is a cross-sectional view, FIG. 8 is an EE cross-sectional view of FIG. 5, and FIG. 9 is a longitudinal cross-sectional explanatory view of a shaft of a billiard cue showing the third embodiment, and FIG. 10 is an FF cross-sectional view of FIG. FIG. 11 is a GG sectional view of FIG. 9, FIG. 12 is a HH sectional view of FIG. 9, and FIG. 13 is a longitudinal sectional view of a pipe-like intermediate member of a shaft of a billiard cue showing a third embodiment. explain.

  As shown in FIGS. 1, 2, 5, and 9, the shaft 1 is a rod-like body that becomes thinner as it goes to the shaft front end portion 11a, and is connected to a bat (not shown) at the joint portion 10a at the rear end.

  A shaft 1a of a billiard cue according to a first embodiment which is an invention according to claims 1 to 3 will be described with reference to FIGS. The shaft 1a of the billiard cue is provided with a pipe-shaped intermediate material 2 made of hard synthetic resin in the longitudinal direction at the center of the circular cross section of the shaft 1a, and an outer layer material 3 made of wood is formed on the outer layer of the pipe-shaped intermediate material 2. Is provided as the outermost layer.

  In this first embodiment, the pipe-shaped intermediate material 2 is formed in a pipe shape having the same outer diameter and the same inner diameter, and is made of a hard synthetic resin material such as glass fiber resin.

  The outer layer material 3 is provided substantially over the entire length of the shaft 1a, and is formed by combining one or a plurality of wooden materials such as maple materials. In this embodiment, maple material and other wood 2 to 8 members of various varieties are made by combining the members divided in the circumferential direction. However, one piece of wood such as maple material is used for the pipe-shaped intermediate material 2. A hole may be formed in the longitudinal direction. A cylindrical hole having substantially the same diameter is provided at the center of the circular cross section of the outer layer material 3 over the longitudinal direction of the shaft. The inner diameter of this cylindrical hole is around 6 to 9 mm, and in this embodiment is about 8 mm. A hard synthetic resin having an outer peripheral surface coated with an adhesive in the cylindrical hole of the outer layer material 3, that is, a pipe-shaped intermediate material 2 made of glass fiber resin in this embodiment, is inserted and fixed to each other with an adhesive.

  As shown in FIG. 3, the pipe-shaped intermediate member 2 of the butt connection side portion 10 of the shaft 1a is provided with a core member 4 as the innermost layer in the hollow cylindrical portion. The length of the connection side portion 10 with the bat is about ½ to ¼ of the length of the shaft. In this embodiment, the core member 4 is made of a carbon fiber resin pipe or a pipe-like body such as a carbon nanotube. As another embodiment, a core material made of the same carbon fiber resin but having no hollow portion may be used. The joint portion 10a is provided with a female screw that is a connection portion with the bat.

  As shown in FIG. 4, the pipe-shaped intermediate member 2 at the tip end portion 11 of the shaft 1a is provided with a sound absorbing material 5 made of a soft synthetic resin foam or the like in the hollow cylindrical portion thereof. . In this embodiment, urethane foam, which is a soft synthetic resin, is used as the material of the sound absorbing material 5, but any material that is lightweight and has a sound absorbing action can be used.

  Next, a billiard cue shaft 1b according to a second embodiment, which is an invention according to claims 4 to 6, will be described with reference to FIGS. The billiard cue shaft 1b is provided with a butt connection side portion 10, a shaft tip side portion 11, and an intermediate portion 12 located in the middle in the longitudinal direction.

  A pipe-shaped intermediate material 2 having the same outer diameter made of hard synthetic resin is provided in the center of the circular cross section of the butt connection side portion 10 in the longitudinal direction, and an outer layer material made of wood is formed on the outer layer of the pipe-shaped intermediate material 2. 3 is provided as the outermost layer.

  The outer layer material 3 is provided substantially over the entire length of the shaft 1b, and is formed by combining one or a plurality of wooden materials such as maple materials. In this embodiment, maple material and other wood 2 to 8 members of various varieties are made by combining the members divided in the circumferential direction. However, one piece of wood such as maple material is used for the pipe-shaped intermediate material 2. A hole may be formed in the longitudinal direction. A cylindrical hole having substantially the same diameter is provided at the center of the circular cross section of the outer layer material 3 over the longitudinal direction of the shaft. The inner diameter of this cylindrical hole is around 6 to 9 mm, and in this embodiment is about 8 mm. A hard synthetic resin having an outer peripheral surface coated with an adhesive in the cylindrical hole of the outer layer material 3, in this embodiment, a pipe-shaped intermediate material 2 made of glass fiber resin is inserted and fixed to each other with an adhesive.

  As shown in FIG. 6, the pipe-shaped intermediate member 2 of the butt connection side portion 10 of the shaft 1b is provided with the core member 4 as the innermost layer in the hollow cylindrical portion. The length of the connection side portion 10 with the bat is about ½ to ¼ of the length of the shaft. In this embodiment, the core member 4 is made of a carbon fiber resin pipe or a pipe-like body such as a carbon nanotube. As another embodiment, a core material made of the same carbon fiber resin but having no hollow portion may be used.

  As shown in FIG. 7, the intermediate portion 12 of the shaft 1b is formed from the center to the outer layer by using one or a plurality of wooden materials such as the same material as the outer layer material 3 and maple material. No holes are formed.

  As shown in FIG. 8, the pipe-shaped intermediate member 2 at the tip end portion 11 of the shaft 1b is provided with a sound-absorbing material 5 made of a soft synthetic resin foam or the like in its hollow cylindrical portion. . Any material can be used as the material of the sound absorbing material 5 as long as it is lightweight and has a sound absorbing effect.

  Next, a billiard cue shaft 1c according to a third embodiment, which is an invention according to claims 7 and 8, will be described with reference to FIGS. The shaft 1c of the billiard cue is provided with a pipe-shaped intermediate material 2 made of hard synthetic resin in the longitudinal direction at the center of the circular cross section of the shaft 1c, and an outer layer material 3 made of wood is formed on the outer layer of the pipe-shaped intermediate material 2. Is provided as the outermost layer.

  In this third embodiment, the pipe-shaped intermediate material 2c is formed in a pipe shape having the same outer diameter and different inner diameters as shown in FIGS. 9 and 13, and is made of a hard synthetic resin material such as glass fiber resin. Consists of. That is, the pipe-shaped intermediate member 2c has the same outer diameter over the longitudinal direction of the shaft 1c, but the inner diameter of the end portion 11c of the shaft is larger than the inner diameter of the butt connecting portion 10c. .

  In this embodiment, the pipe-shaped intermediate material 2c is divided into three parts, the inner diameter Da of the shaft tip side part 11c is the largest, the inner diameter Db of the intermediate part 12c is the next largest, and the butt connection into which the core material 4 enters. The inner diameter Dc of the side portion 10c is configured to be the smallest step. Therefore, the cylindrical wall thickness of the pipe-shaped intermediate member 2c is such that the cylindrical wall of the shaft tip side portion 11c is the thinnest, the cylindrical wall of the intermediate portion 12c is thicker on the inner peripheral side, and the core material 4 is The cylindrical wall of the butt connection side portion 10c that enters is the thickest.

  The cylindrical interior 20a of the shaft tip side portion 11c of the pipe-shaped intermediate material 2c and the cylindrical interior 20b of the intermediate portion 12c are provided with a sound absorbing material 5 made of soft synthetic resin foam or the like filled in the cylinder. In this embodiment, urethane foam, which is a soft synthetic resin, is used as the material of the sound absorbing material 5, but any material that is lightweight and has a sound absorbing action can be used.

  In the pipe-shaped intermediate member 2c of the butt connection side portion 10c of the shaft 1c, the core member 4 is provided as the innermost layer in the hollow cylindrical portion 20c. The length of the butt connection side portion 10c is about ½ to ¼ of the length of the shaft 1c. In this embodiment, the core member 4 is made of a carbon fiber resin pipe or a pipe-like body such as a carbon nanotube. As another embodiment, a core material made of the same carbon fiber resin but having no hollow portion may be used. The joint portion 10a is provided with a female screw at the end of the butt connection side portion.

  The outer layer material 3 of the third embodiment is provided substantially over the entire length of the shaft 1c, and is formed by combining one or a plurality of wooden materials such as maple materials. In this embodiment, maple material and other wood 2 to 8 members of various varieties are made by combining the members divided in the circumferential direction. However, one piece of wood such as maple material is used for the pipe-shaped intermediate material 2. A hole may be formed in the longitudinal direction. A cylindrical hole having substantially the same diameter is provided at the center of the circular cross section of the outer layer material 3 over the longitudinal direction of the shaft. The inner diameter of this cylindrical hole is around 6 to 9 mm, and in this embodiment is about 8 mm. A hard synthetic resin having an outer peripheral surface coated with an adhesive in the cylindrical hole of the outer layer material 3, that is, a pipe-shaped intermediate material 2 made of glass fiber resin in this embodiment, is inserted and fixed to each other with an adhesive.

  According to the present invention, since it is configured as described above, the base side of the shaft, that is, the butt connection side portion 10 has two layers of the core material 4 and the pipe-shaped intermediate material 2 made of hard synthetic resin from the center side of the circular cross section. There is a hard center material, and it is formed with a triple layer together with the outer layer material 3. On the other hand, the shaft tip side portion 11 is provided with a sound absorbing material 5 made of a soft synthetic resin foam or the like in the hollow cylindrical portion of the pipe-shaped intermediate material 2. Therefore, the tip end portion 11 of the shaft is relatively more flexible than the connecting portion 10 with the bat, and the connecting portion with the bat has a harder structure. Compared with the shaft, the tip can repel sharply and strongly when hitting the ball.

  Since the tip end portion 11 of the shaft is more flexible than the connecting portion 10 with the bat, the billiard ball can be strongly rotated by sharpening the tip. Therefore, if the billiard ball is advanced, reverse, and left / right rotated as before, the same rotation will occur even if the billiard ball is hit with a small amount of force, making ball control much easier than before. Became.

  In particular, the outer diameter of the pipe-shaped intermediate material is the same in the longitudinal direction of the shaft, but the inner diameter is larger at the tip side portion of the shaft than at the connection side portion with the bat, that is, the pipe-shaped intermediate material. By making the wall thickness of the material relatively thin at the tip end portion of the shaft than at the connection side portion with the bat, it is possible to provide a billiard shaft with a lighter tip and flexibility. .

  Furthermore, since the sound-absorbing material 5 made of a soft synthetic resin foam or the like is provided in the hollow cylindrical portion of the pipe-shaped intermediate material made of hard synthetic resin, the tip end portion 11 of the shaft does not impair flexibility and lightness. Moreover, since it has sound absorbing properties, the ball hitting sound resonates within the hollow cylindrical portion, and the vibration is not transmitted to the player's hand and does not lower the sense.

  Since the sound-absorbing material 5 is made of a soft synthetic resin foam such as urethane foam, the weight balance of the shaft 1 is not lost because it is lightweight.

  As a billiard cue, it is expected to be used by beginners to advanced players.

Front view showing the appearance of billiard cue shaft The longitudinal cross-sectional explanatory drawing of the shaft of the billiard cue which shows 1st Embodiment of this invention AA sectional view of FIG. 2 BB sectional view of FIG. 2 Partial cross-sectional explanatory drawing of the shaft of the billiard cue showing the second embodiment of the present invention CC sectional view of FIG. 5 DD sectional view of FIG. 5 EE sectional view of FIG. 5 Vertical section explanatory drawing of the shaft of the billiard cue showing the third embodiment of the present invention FF sectional view of FIG. 9 GG sectional view of FIG. 9 HH sectional view of FIG. 9 The longitudinal cross-sectional view of the pipe-shaped intermediate material of the shaft of the billiard cue which shows 3rd Embodiment of this invention

1a Shaft (first embodiment)
1b Shaft (second embodiment)
1c Shaft (Third Embodiment)
DESCRIPTION OF SYMBOLS 10 Connection side part with shaft bat 10a Joint part 11 Tip side part 11a Tip 12 Intermediate part 2 Pipe-shaped intermediate material (glass fiber resin etc.)
2c Pipe-shaped intermediate material (third embodiment)
20a Shaft tip side portion of the pipe-shaped intermediate member of the third embodiment 20b Intermediate portion of the pipe-shaped intermediate member of the third embodiment 20c Bat connecting side portion of the pipe-shaped intermediate member of the third embodiment Da Pipe of the third embodiment Inner diameter of the intermediate portion of the shaft-shaped intermediate material Db Inner diameter of the intermediate portion of the pipe-shaped intermediate material of the third embodiment Dc Inner diameter of the butt connection side portion of the pipe-shaped intermediate material of the third embodiment 3 Outer layer material (maple material, etc. Multiple types of wood)
4 Core material (carbon fiber resin, carbon nanotube, etc.)
5 Sound absorbing material (urethane foam, etc.)

Claims (8)

It is a shaft of a billiard cue formed by connecting a shaft and a bat,
A pipe-shaped intermediate material made of a hard synthetic resin is provided in the center of the circular cross section of the shaft in the longitudinal direction, and an outer layer material is provided as an outermost layer on the outer layer of the intermediate material,
A core material is provided as the innermost layer in the hollow cylindrical portion of the pipe-shaped intermediate material on the connection side portion with the bat,
A billiard cue shaft comprising: a sound absorbing material provided in a hollow cylindrical portion of a pipe-like intermediate member at a tip side portion of the shaft.   2. The billiard cue shaft according to claim 1, wherein the connection side portion with the bat has a length of about 1/2 to 1/4 of the length of the shaft.   The billiard cue shaft according to claim 1, wherein the core material is made of carbon fiber resin or carbon nanotube. It is a shaft of a billiard cue formed by connecting a shaft and a bat,
A pipe-shaped intermediate material made of hard synthetic resin is provided in the center of the circular cross section of the circular section of the connection side portion with the bat, and an outer layer material is provided as the outermost layer on the outer layer of this pipe-shaped intermediate material, and the pipe-shaped intermediate The core material is provided as the innermost layer in the hollow cylindrical portion of the material,
A pipe-shaped intermediate material made of a hard synthetic resin is provided in the longitudinal direction in the center of the circular cross section of the tip side portion of the shaft, and an outer layer material is provided as an outermost layer on the outer layer of the pipe-shaped intermediate material, and the pipe-shaped intermediate material A sound absorbing material is provided in the hollow cylindrical part of
The billiard cue shaft is characterized in that an intermediate portion is provided between the connecting portion with the bat and the tip end portion of the shaft, and the intermediate portion is formed from the center to the outer layer by the same material as the outer layer material.   5. The billiard cue shaft according to claim 4, wherein the connection side portion with the bat is about 1/2 to 1/4 of the length of the shaft.   The billet cue shaft according to claim 4 or 5, wherein the core material is made of carbon fiber resin or carbon nanotube. It is a shaft of a billiard cue formed by connecting a shaft and a bat,
A pipe-shaped intermediate material made of a hard synthetic resin is provided in the center of the circular cross section of the shaft in the longitudinal direction, and an outer layer material is provided as an outermost layer on the outer layer of the intermediate material,
A core material is provided as the innermost layer in the hollow cylindrical portion of the pipe-shaped intermediate material on the connection side portion with the bat,
While providing a sound absorbing material in the hollow cylindrical portion of the pipe-like intermediate material at the tip side portion of the shaft,
The pipe-like intermediate material has the same outer diameter in the longitudinal direction of the shaft, and the inner diameter of the tip side portion of the shaft is larger than the inner diameter of the connection side portion with the bat. . 8. The billiard cue shaft according to claim 7, wherein an inner diameter of the pipe-shaped intermediate member is divided into a plurality of inner diameter portions, and the inner diameter portion becomes larger toward the tip side portion of the shaft.

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