JP5024742B2 - Baseball bat and its manufacturing method - Google Patents

Description

  The present invention relates to a baseball bat and a manufacturing method thereof.

  Conventionally, the materials that are commonly used as baseball bats are wooden, metal, and FRP (made of reinforced plastic), but these have characteristics in terms of impact performance and have unavoidable drawbacks. ing. That is, the wooden bat has a good feel and a hitting ball effect, but it is easy to break, and there is a risk that the wood resources may be reduced or depleted. Metal bats have excellent durability, but it is inevitable that there is a hard intuition especially in the shaft portion. Further, in the FRP bat, the shaft portion has excellent anti-toughness, but the durability of the hit ball portion is lowered by repeated hits, and there is a drawback that it is easily damaged.

The present invention, for integrating the formation of baseball bat body forming a baseball bat, firmly can be performed efficiently, as baseball bat obtained thereby, have a durable, anti-repellent force The purpose is to obtain a product with excellent toughness.

The hitting ball portion (B) is made of a hollow aluminum alloy, and has an incision (s) having a depth and a width obliquely with respect to the central axis of the bat main body (2) on the end surface connected to the shaft portion (A). ), And a shaft part (A) is made in advance with a prepreg made of a base material such as carbon fiber and an epoxy resin in the shape and configuration, and the shaft part (A) and the hitting ball part (B) are both joined. Baseball characterized in that a bat body (2) that is completely integrated is obtained by winding this prepreg material around the outside of the part (a), placing it in a molding die and pressurizing and heating it. preparation of use bat hitting portion (B) consists of hollow shaped aluminum alloy, the end face of the side connected to the shaft portion (a), switching having a depth and width obliquely to the center shaft line of the bat body Insert the eyes (s), and as the shaft part (A), create a prepreg made of a base material such as carbon fiber and epoxy resin in the shape and configuration in advance, and further, the shaft part (A), hitting ball part (B) This prepreg material is wound around the outside of both joints (a), put into a mold for molding, and press-heated to form a completely integrated bat body (2). The baseball bat is configured.

In the baseball bat of the present invention, the shaft portion (A) is an FRP bat itself in the joint portion (a) of both the shaft portion (A) and the hit ball portion (B), and the hit ball portion (B) is an aluminum material. As it is, an aluminum material is held inside the joint (a), and FRP material layers are formed on both outer surfaces thereof. Configuration in which the striking portion (B), by is provided with a cut portion of the Switching Operation eye having a depth and width from the end surface of the aluminum material (s), the aluminum material in the joint (a) The FRP material layer (A ′) is formed over the front and back of the pipe to be formed, and the whole is integrated to form a very strong joint (a). The present invention can efficiently integrate the formation of the bat body forming the baseball bat, and the baseball bat obtained thereby can replace the conventional wooden bat, metal bat, FRP bat, and the like. Te, a baseball bat with excellent anti-repellent toughness with excellent durability.
For bats.

An embodiment of the baseball bat (1) of the present invention and its manufacturing method will be described. As shown in FIG. 1, the baseball bat (1) as a whole has a shaft portion (A) of the bat body (2) as a main component. And a hitting ball portion (B), to which a tip portion (3) and a grip end (4) are attached. As a feature of the present invention, the bat body (2) is composed of two parts, and they are firmly bonded and joined at the joint (a) to be integrated. The hitting ball portion (B) is made of a hollow aluminum alloy, and is formed by swaging an aluminum pipe. As shown in FIGS. 2 and 3, the small diameter portion side [shaft portion ( A) on the end surface (B ₁ ) on the side connected to A) is oblique to the central axis of the bat main body (2) at an angle of about 60 degrees and a depth of about 2 to 4 cm , and a width of about the ratio shown in FIG. cuts (s) the four places number of switching Operation eye (s) is optionally and good] having put on. Note the direction of applying the Switching Operation eye (s) may be in the opposite direction, i.e. downward where shown.

FIG. 4 shows a longitudinal section in a state where the shaft portion (A) and the hit ball portion (B) are joined and integrated. That is, the shaft portion (A) is firmly attached to the hitting ball portion (B), and it is made of a base material such as carbon fiber and glass fiber and an epoxy resin in advance as the shaft portion (A). Put the air bag inside, and wrap the prepreg material on the outside of the joint (a) in the same way, put it in the mold for molding, pressurize the air in the air bag under high pressure By heat molding, a completely integrated bat body (2) is obtained. That is, in the illustration of the joint portion (a), the left shaft portion (A) is an FRP bat itself, the hitting ball portion (B) is an aluminum material bat, and the joint portion (a) contains an aluminum material inside. And FRP material layers (A ′) are formed on both outer surfaces thereof. This aforementioned FIG 2, by is provided with a cut portion of the cut eye having a depth and width from the end surface of the aluminum material (B _{1) (s)} to the hitting portion (B) as shown in FIG. 3, As shown in FIG. 5, the FRP material layer (A ′) is formed on the front and back surfaces of the pipe made of aluminum material at the joint (a) and integrated. As a result, the inner and outer FRP material layers (A ′) are completely integrated to form a very strong joint (a).

The front view which shows the bat for baseballs of this invention. The front view which shows the hit | ball-shot part of the baseball bat of this invention. The end surface expansion perspective view of FIG. The longitudinal cross-sectional view of the junction part of the baseball bat of this invention. The cross-sectional view of the junction part of the baseball bat of this invention.

Explanation of symbols

(1) baseball bat (2) the bat body (A) a shaft portion (B) hitting portion (3) tip (4) grip end (a) the joint (s) Switching Operation eyes <br/> (A ') FRP material layer _(B 1) the end face

Claims (2)

The hitting ball part is made of a hollow aluminum alloy, and at the end face on the side connected to the shaft part, a notch having a depth and a width is formed obliquely with respect to the central axis of the bat body, and the shape of the shaft part in advance, the structure made of base material and an epoxy resin such as carbon fiber prepreg, put the air bag therein, these shaft portions, on the outside of the joint portion of the hitting portion both wound prepreg material, for molding it A baseball bat manufacturing method, characterized in that a fully integrated bat body is obtained by pressurizing and heat-molding an air bag with high pressure in a mold. The hitting ball part is made of a hollow aluminum alloy, and at the end face on the side connected to the shaft part, a notch having a depth and a width is formed obliquely with respect to the central axis of the bat body, and the shape of the shaft part in advance, the structure made of base material and an epoxy resin such as carbon fiber prepreg, put the air bag therein, these shaft portions, on the outside of the joint portion of the hitting portion both wound prepreg material, for molding it A baseball bat characterized in that a fully integrated bat main body is formed by pressurizing and heat-molding the air bag in a mold with high pressure .

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