JP4017429B2 - Baseball or softball bat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a baseball bat or a softball bat (hereinafter abbreviated as a bat), and more specifically, by using a waste wood material and forming a bat using FRP, and thus durability. It is related with the bat which improved.
[0002]
[Prior art]
Conventionally, blue duck, ash, Yachidamo, etc. have been used as wooden bats. In general, the above-mentioned blue duck and ash can be used as white wood, but recently, these wood resources are depleted, making it difficult to obtain them, resulting in an imbalance between supply and demand. On the other hand, Yachidamo wood is abundant in resources, but due to the nature of Yachidamo wood itself, the diameter of the conduit within the wood pores is large, and the conduit is made up of several layers. If used, repeated hitting has the disadvantage of splitting or peeling at the conduit.
Conventionally, various attempts have been made to protect resources by improving durability without losing the feeling of use of the wooden bat.
For example, as disclosed in Japanese Patent Laid-Open No. 50-133028, a wooden strip is wound around the hitting portion of a wooden bat core with an adhesive, or Japanese Patent Laid-Open No. 53-59546. As disclosed, a laminated body in which a wood layer and a carbon fiber reinforced plastic are joined is formed, a square is made from the laminated body, and then the square is formed by cutting out the square like a conventional wooden bat. Bats are known.
Japanese Utility Model Publication No. 60-187775 discloses a conventional baseball wooden bat in which a central shaft core portion is cut out and light alloy bars of various shapes and materials are inserted therein to increase the strength. Has been.
[0003]
[Problems to be solved by the invention]
The conventional bat made of a composite material made of wood and other materials has the following problems.
That is, in the butt which is formed by winding wearing stripping plate of wood adhesive hitting portion of the wooden bats core, greater than a predetermined weight by using a large wood specific gravity to improve the durability It is difficult to reduce the weight. Further, since a natural material such as wood is used for the core material, there are problems that the core material is easy to break and the core material has a large variation, so that a core material of a certain quality cannot be provided.
[0004]
The bat a laminate obtained by bonding a layer of carbon fiber reinforced plastic wood, intended and laminating the wood and carbon fiber reinforced plastics, the final batt shape after forming a laminated body of rectangular or substantially bat shape For this reason, since the carbon fiber reinforced plastic is exposed on the surface of the bat, the carbon fiber polishing powder adheres to the entire bat and becomes black when polishing is finished.
The length of the layer of wood, because of the length (830~860mm) min necessary part of the bat at a minimum, and that not always save timber, when molding, a layer of wood many layers For this reason, there are problems that the number of bonding steps is increased and a large amount of adhesive is required.
[0005]
In addition, in a bat that has been strengthened by hollowing out the central axis of the wooden bat and inserting light alloy bars of various shapes and materials into it, the amount of wood used forms a normal wooden bat. Is required, and the accuracy of the outer diameter of the hole made in the wooden bat and the light alloy rod is considerable, which is troublesome.
Therefore, in view of the above problems, an object of the present invention is to provide a bat having improved durability without reducing the amount of wood used and losing the feeling of use of the wooden bat.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a bat according to claim 1 of the present invention is a bat comprising a hitting ball portion, a grip portion, and a tapered portion connecting them, and is a cylindrical hitting ball outer shell made of wood. When it formed in FRP, a FRP bat body made of the hitting core in the inside is adhered to the inner wall of the ball striking outer shell of the ball outer shell and the tapered portion and the grip portion, the hitting portion An annular body made of an elastic body is disposed at a joint portion in the bat length direction of the outer shell body and the bat main body, and these are formed by joining and integrating the FRP bat main body at the same time as curing and molding. Softball bat.
[0007]
A second aspect of the present invention, in a baseball or softball bat according to claim 1, wherein the hitting portion outer shell is a bat for baseball or softball, characterized in that formed by bonding a plurality of wood pieces.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on preferred embodiments of the present invention shown in FIGS. That is, FIG. 1 is a schematic view of the bat of this embodiment, and FIG. 2 is a cross-sectional explanatory view of the bat 1 shown in FIG. The bat 1 of the present embodiment has a hitting ball portion 2, a tapered portion 3, and a grip portion 4, and the hitting ball portion 2 is a waste material of wood such as blue damo, ash, yachidamo, white ash, and maple. A hitting ball outer shell 5 formed in a cylindrical shape from a wooden material in a state in which a normal wooden bat cannot be formed), and a hitting ball core 6a and a taper 3 which are bonded to the inner wall of the hitting ball outer shell 5 The bat body composed of the grip part 4 is a baseball or softball bat made of FRP and made of a composite material.
[0012]
Moreover, as a joining structure of the hitting ball outer shell 5 made of wood constituting the hitting ball part 2 and the bat main body made of FRP constituting the other part, wood corresponds to the hitting ball part 2 of the bat. A ball-hitting portion outer shell body 5 that is cut into an outer shape that is hollow and has a hollow inside, a ball-hitting core portion 6 a that matches the hollow portion 5 b of the ball-hitting portion outer shell body 5, and a taper The part 3 and the grip part 4 are integrally formed with the FRP bat main body 6 made of FRP material, and the hitting core part 6a of the FRP bat main body 6 is fitted into the hollow part 5b of the hitting part outer shell 5. Are joined together.
[0013]
Furthermore, in the joining, the FRP bat main body 6 and the hitting ball outer shell 5 may be joined with an elastic layer interposed therebetween. Specifically, a layer of viscoelastic material such as thermoplastic elastomer or synthetic rubber is provided between the hitting core portion 6a of the bat main body 6 and the inner wall 5a of the hollow portion 5b of the hitting portion outer shell 5. By joining in a wet state, there is an advantage that the coefficient of restitution upon hitting can be improved and numbness transmitted to the hand can be alleviated.
[0014]
Also, the length of the bat when the hitting core portion 6a is inserted into the hollow portion 5b of the hitting ball outer shell 5 and the inner wall 5a of the hitting ball outer shell 5 and the hitting ball core 6a are joined. By disposing an annular body 7 made of an elastic body between the lower end surface 5c of the hitting ball outer shell 5 and the tapered upper end surface 6c of the FRP bat main body 6, which is a joint surface in the direction, The shell 5 and the tapered portion of the bat body can be smoothly joined.
[0015]
In other words, there is a possibility that the bat will be broken at that point in the FRP bat body hitting the core part 6a of 6 and the FRP butt stress concentration when get large step at the boundary of the tapered portion 6b of the main body 6, FRP It is necessary to form the bat body 6 in a smooth shape so that there is no step near the boundary. Therefore, when the annular body 7 is not provided, a large chamfer must be chamfered using a lathe or the like on the tapered portion side of the hollow portion of the hit ball portion outer shell body 5. However, if the hollow portion is formed in a smooth shape in advance when the annular body 7 is formed, it is not necessary to perform this operation and the production efficiency is increased.
The elastic body forming the annular body 7 has relatively elasticity such as ABS resin, nylon resin, urethane resin, EVA resin, polyethylene resin, polypropylene resin, polycarbonate resin, etc., and adhesiveness to the FRP bat body 6 A good synthetic resin material can be used.
[0016]
A method for manufacturing the bat 1 made of the composite material of the present invention will be described.
(Formation of the hit ball outer shell 5)
As shown in FIG. 3, a wood 8 that is 100 mm square and about 360 mm long is prepared. The wood 8 may be a single wood or a plurality of wood pieces may be bonded together. Then, the wood 8 is cut so that the outer shape becomes a shape corresponding to the hitting ball portion 2 of the bat, and then a hole of φ25 mm is formed in the central portion of the hitting ball portion 2 to form a hollow portion 5b. The body 5 is molded. The hollow portion 5b may have a cylindrical shape penetrating to the hitting ball tip end surface 5d, or may have a cylindrical shape that does not penetrate the hitting ball tip end surface 5d.
[0017]
(Formation of FRP bat body 6)
First, as shown in FIGS. 4 and 5, a mandrel 10 a for forming a hitting ball core portion 6 a substantially corresponding to the hollow portion 5 b of the hit ball portion outer shell 5, and the tapered portion 3 and the grip portion 4 of the bat 1 are provided. A predetermined amount of the prepreg 9 is wound around the mandrel 10b having a substantially corresponding shape, and then each mandrel is extracted and connected to form the FRP molded body 60. Then, a stretchable elastomer tube 11 is inserted into the FRP molded body 60.
[0018]
(But forming)
As shown in FIG. 5, the hitting core portion 6 a of the FRP molded body 60 is inserted into the hollow portion 5 b of the hitting portion outer shell 5. At this time, an annular body 7 is arranged on the lower end surface 5c of the hitting ball outer shell 5, and the hitting core 6a is first inserted through the annular body 7 and then into the hollow portion.
Thereafter, assembled in this manner, the said ball striking outer shell 5 and the annular body 7 FRP bat shaped body 60, as shown in FIG. 7, placed in a mold 12 of the bat forming, illustrated after clamping the upper mold which are not, by injecting compressed air or the like into the elastomer tube 11 flares the elastomer tube 11, adhered to the prepreg 9 of the FRP molded body 60 on the inner wall of the molding die 12 By heating in such a state, the hit ball portion outer shell 5 and the FRP molded body 60 are integrated to obtain the bat 1.
[0019]
As shown in FIG. 6, the annular body 7 smoothly connects the lower end surface 5 c and the tapered upper end surface 6 c of the hitting ball outer shell 5 made of wood. In the case where no member is interposed, it is preferable that the thickness of the lower end portion of the hit ball portion outer shell 5 is tapered so as to become thinner toward the lower end and smoothly connected to the tapered portion upper end surface 6c.
Further, even when the hitting portion outer shell 5 and the FRP molded body 60 are integrated and molded and then the surface is polished and finished, the FRP portion also has a role of preventing the abrasive powder from sticking to wood.
[0020]
In the above-described manufacturing method, when the FRP bat main body 6 is molded and joined to the wooden hitting ball outer shell 5 at the same time as the molding of the FRP bat main body 6, the wooden hitting ball outer shell 5 is used. Is formed in advance to be larger than the diameter of the hit ball portion 2 of the finished bat 1, and the bat in which the hit ball portion 2 is compressed can be formed by the same method as described above. Further, if the wooden hitting ball outer shell 5 formed beforehand larger than the diameter of the hitting ball portion 2 of the finished bat 1 is impregnated with a synthetic resin and molded by the same method as described above, the resin Since the impregnated compression hitting portion can be formed, a bat with improved durability can be formed.
[0021]
【The invention's effect】
As described above, in the bat of the present invention, the bat main body including the hitting ball core portion, the taper portion, and the grip portion is formed of FRP, and an annular body including the wooden hitting ball portion and the elastic body is disposed on the surface of the hitting ball core portion. Thus, by forming the FRP bat main body at the same time as the hard molding , the hitting portion outer shell 5 and the taper portion of the bat main body can be smoothly joined without impairing the hitting feeling of the wooden bat. It becomes a bat with excellent durability. In addition to using less wood than conventional wooden bats, the ball striking core portion by FRP is fitted inside the ball striking portion, so that it is possible to use a collection of wood pieces. The use of wood can be minimized and the environment can be protected. Further, since the bat body is an FRP having a large degree of design freedom, the FRP portion can be designed to be light, and a wood having a heavy specific gravity can be used for the hitting ball portion.
[Brief description of the drawings]
FIG. 1 is a schematic view of a bat according to an embodiment.
FIG. 2 is a cross-sectional explanatory view of the bat of the embodiment.
FIG. 3 is a view for explaining a manufacturing method of a hitting portion outer shell of a bat according to an embodiment.
FIG. 4 is a view for explaining a method for manufacturing an FRP molded body of a bat according to an embodiment.
FIG. 5 is a view for explaining a manufacturing method of the bat of the embodiment.
FIG. 6 is a cross-sectional explanatory view of a joining portion of the bat of the embodiment.
FIG. 7 is a view for explaining a manufacturing method of the bat of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bat 2 Hitting part 3 Tapered part 4 Grip part 5 Hitting part outer shell 5a Inner wall 5b Hollow part 5c Lower end surface
5d Hitting ball front end surface 6 FRP bat main body 6a Hitting ball core
6b Taper part
6c Taper upper end surface 7 Annular body 8 Wood 9 Prepreg 10a Mandrel 10b Mandrel 60 FRP molded body 11 Elastomer tube 12 Mold

Claims (2)

A hitting part, a grip part, and a bat comprising a taper part connecting them, formed of a cylindrical hitting part outer shell made of wood, and FRP, inside the hitting part outer shell, and a FRP bat body made of hitting the core part and the tapered portion and a grip portion to be bonded with the inner wall of the ball outer shell, made of an elastic material the butt joint in the longitudinal direction of the hit ball outer shell and bat body A baseball or softball bat characterized in that an annular body is arranged, and these are joined and integrated simultaneously with the hardening molding of the FRP bat main body . The hitting portion envelop baseball or softball bat according to claim 1, characterized by being formed by bonding a plurality of wood pieces.

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