JPH0691026A - Bat and forming method therefor - Google Patents

Abstract

PURPOSE:To improve the qualities of vibration damping and durability by covering at least the outer surface of the ball batting portion of a bat main body an excellent electroconductive material by means of an electromagnetic processing method. CONSTITUTION:A bat main body 2 is formed by esing, for example, a glass fiber and a carbon fiber as a reinforcement fiber and an epoxy formation polyamino amide resin as a matrix resin, and a recessed portion 8 having the length range of about 10-15cm upward and downward with a sweet spot as a center is formed at the circumferential part of a ball batting portion. Next, a large diameter pipe body 3a made of an aluminum alloy which has thickness and length coincidented with the recessed portion 8 of the bat main body 2 and having a diameter into which the bat main body 2 can be inserted freely, is inserted into a processing device 6 in a state in which the pipe body 3a is idly put on the bat main body 2. Strong ragnetic fields B are formed at the processing device 6 by running momentarily an electric current accumulated at a capacitor 5, and by adding pressurizing force to the pipe body 3a by making magnetic fields B repulse against magnetic fields caused by a secondary electric current induced at the pipe body 3a made of the aluminum alloy, and conducting contraction and close adhesion to the bat main body 2 is realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a baseball or softball bat, and more particularly to a composite bat and a method of forming the same.

[0002]

2. Description of the Related Art A bat for baseballs and softballs is a bat made of metal mainly composed of aluminum or made of FRP having reinforcing fibers such as long and short fibers and a thermoplastic or thermosetting synthetic resin as a matrix. Is the mainstream. Further, in the case of a metal bat, there are drawbacks such as the difficulty of forming the metal bat and the fact that the sound at the time of hitting is a metallic sound, which is not preferable.
In the P-made bat, in order to compensate for the drawbacks such as the possibility of delamination due to repeated hitting, the lack of surface resin due to impact or contact with the ground, and the problem of durability and wear resistance such as cracks, It can be seen that the entire length of the bat-made bat is covered with an FRP layer having carbon fiber or glass fiber as a reinforcing fiber, or that the metal bat is provided with an FRP layer of carbon fiber or glass fiber on the inner peripheral surface. . Since these bats take a lot of time to combine FRP and metal, and the effect of the combination is not seen so much, F
There is seen a bat made of a composite material, which is made of a material different from the constituent material of the main body, such as an aluminum alloy, for the hitting portion of the RP bat to improve vibration damping and durability.

[0003]

However, in the case of the composite material bat having the structure in which the surface of the conventional metal bat is covered with the FRP layer, it is a method of compounding a usual metal bat into a molded product. The aluminum alloy for forming the metal bat has poor workability, and it is costly to combine the FRP layer. Also, these bats are FR
Since the P layer is only thin and covers the whole, there is a drawback that the composite effect cannot be expected so much.

Further, in a bat in which a base tube made of a metal such as an aluminum alloy is built in the hitting portion of an FRP bat, the metal is a part of the bat, and the method of incorporating the metal by bonding is very useful for bonding the FRP and the metal. In addition to having to be careful, there was a problem that it was difficult to put metal on the surface of the hit ball. Therefore, the present invention is to provide a bat and a molding method thereof, in which at least the outer surface of the hitting portion of the bat body is coated with a good electric conductor material by an electromagnetic machining method to improve vibration damping and durability. is there.

[0005]

The bat of the present invention is a bat having a structure in which at least the outer surface of the hitting portion of the bat body is coated with a material having a good electric conductor by an electromagnetic machining method. The portion of the bat body covered with the good electric conductor material may be in the vicinity of the sweet spot of the hitting portion, the entire hitting portion, or the entire bat from the hitting portion to the grip portion. The material to be coated must be a good conductor material because it is coated by an electromagnetic machining method, and for example, metals such as aluminum, magnesium, copper, platinum, brass, gold, silver, steel and alloys thereof can be used. . The thickness of the good conductor material can be arbitrarily selected, but is 0.5 to 3.
It is preferable to use it with a thickness of 0 mm. If it is 0.5 mm or less, the characteristics of the material cannot be exhibited, which is not preferable, and if it is 3.0 mm or more, processing cannot be performed, which is not preferable. The material for forming the bat body may be any material commonly used for bats, such as wood or FR.
Examples include P, metals, and composites thereof.

An electromagnetic processing method is used as a method for forming the bat of the present invention. That is, in a cylindrical processing device capable of taking in and out a bat made of a conductor, a tube body made of a good electric conductor material is loosely inserted and inserted into the bat body, and the current passed through the cylindrical processing device. The magnetic field generated by and the magnetic field due to the secondary current induced in the good electric conductor by the current repel each other, and many tons of strong pressing force acts on the good electric conductor, and this force deforms the good electric conductor. This is a method of obtaining a bat by closely contacting with the bat body.

[0007]

The bat of the present invention has a structure in which at least the hitting portion of the bat is coated with a good electric conductor material by an electromagnetic machining method. The material covered by the impact of does not peel off. Further, according to the molding method of the present invention, the process is simpler than the adhesive molding, the processing time is short, and mass production is easy. Further, since the material forming the bat body is not particularly limited, bats having various characteristics can be formed. In addition, since it is a non-contact processing method that does not use a mold or jig when molding, the bat surface is not scratched.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external view of a bat 1 formed by the method of the present invention, in which an aluminum alloy cylinder 3 is annularly mounted in a range that covers a sweet spot portion of a hitting portion 4 of a FRP bat body 2. ing. As shown in FIG. 2, the butt body 2 made of FRP is formed with a recess 8 having a depth at which the cylinder 3 can be mounted in the hitting portion, and the cylinder 3 made of an aluminum alloy is formed therein. Are adhered and fixed by electromagnetic processing. Therefore, the tubular body 3 made of aluminum and fixedly attached to the circumstance is flush with the portion of the bat body 2 not covered with the tubular body 3.

As a device for molding the bat of the present invention, as shown in FIG. 3, a capacitor 5 for storing electric energy, a switch device 7 for instantaneously discharging the stored electric energy, and a bat body 2 are provided. It is composed of a processing device 6 for inserting a large-diameter cylindrical body 3a which is loosely fitted in.
To mold the bat 1 of this example, first, the bat body 2 was formed by using glass fibers and carbon fibers as reinforcing fibers and using epoxy-modified polyaminoamide resin as a matrix resin. At this time, a concave portion 8 having a length of 10 to 15 cm is formed vertically around the sweet spot on the circumference of the hitting portion 4.

Next, the recess 8 formed in the circumferential portion of the bat body 2 having the above-described structure is formed to have a thickness and a length that match the recess 8 and a diameter that allows the bat body 2 to be freely inserted. The large diameter cylindrical body 3a made of aluminum alloy is inserted into the processing device 6 in a loosely fitted state, and the processing device 6
Then, the electric current stored in the capacitor 5 is instantaneously flowed to form a strong magnetic field B in the processing device 6, which repels the magnetic field due to the secondary current induced in the aluminum alloy cylinder 3a. A ton of strong pressing force is applied to the large-diameter cylindrical body 3a, and the large-diameter cylindrical body 3a is contracted to be brought into close contact with the bat body 2 to form the bat 1.

As another embodiment, as shown in FIG. 4, the bat body 2 is formed of FRP as in the first embodiment,
The bat has a cylindrical body 3 mounted so as to cover the entire hitting portion 4. At this time, the upper and lower end portions A, A of the large-diameter cylindrical body 3a are
The one-sided tapered shape and the large-diameter cylindrical body 3a were mounted on the bat body 2 in the same manner as in Example 1. By making the upper and lower end portions A, A of the large-diameter cylindrical body 3a one side tapered, the end portions A, A of the cylindrical body 3 coincided with the smooth curve of the bat, and the post-process could be omitted. .

Further, as shown in FIG. 5, the length of the cylindrical body 3 is set so as to cover the entire length of the bat from the grip portion 9 to the tip end 11 of the hitting portion, so that, for example, the bat body 2 is FR.
In the case of forming with P, the cylindrical body may be attached to the surface of the FRP raw pipe as it is by an electromagnetic machining method, and the finishing process can be simplified. Further, as shown in FIG. 6, it is possible to form the cylindrical body 3 and the cylindrical body 3 in a plurality of layers between the cylinder body and the bat body, and to interpose an elastic member for absorbing vibration between the layers. In the present invention, the thickness of the cylindrical body 3 is 0.5 mm to 3.
Since it can be formed in a range of up to 0 mm, it is possible to adjust the balance and the weight by changing the thickness depending on the portion mounted on the bat. In the embodiment, the bat body 2 is FR
Although made of P, it is not limited to FRP, and any material suitable for a bat may be used.

[0013]

As described above, the bat of the present invention is a bat in which at least the sweet area of the hitting portion is provided with a material of high resilience by the electromagnetic machining method, so that the bat is attached to the outermost layer. Further, the bat does not peel off by repeated hitting, can prevent chipping, cracking, etc. due to impact at the time of hitting, and is a bat that is resistant to impact and excellent in durability.
Also, since the cylindrical body and the bat body have different natural frequencies,
Propagation of vibration due to impact at the time of impact is blocked at the boundary with the bat body, so that vibration absorption is improved.

As a method of forming the bat having the constitution of the present invention, the electromagnetic processing method is used, and the method is a method of shrinking the cylinder body without using an adhesive so as to completely adhere to the bat body. Since there is nothing that comes into contact with the cylinder during processing and molding, there is no risk of scratching the mold due to contact with the mold, such as when molding with a mold, so the finish is good. Is. In addition, the durability of the bat is improved without the risk of peeling even after repeated hits. Furthermore, since the thickness of the cylinder can be set in a wide range of 0.5 mm to 3.0 mm, the weight adjustment and balance adjustment of the bat can be performed at the same time.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the internal structure of FIG.

FIG. 3 is a schematic explanatory view of a bat molding method of the present invention.

FIG. 4 is an explanatory cross-sectional view showing another embodiment of the present invention.

FIG. 5 is an explanatory sectional view showing another embodiment of the present invention.

FIG. 6 is an explanatory sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Bat 2 Bat Main Body 3 Cylindrical Body 3a Large Diameter Cylindrical Body 4 Hitting Part 5 Capacitor 6 Processing Device 7 Switch Device 8 Recess 9 Grip Part 10 Tip Part 11 Elastic Member A End B Magnetic Field

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[Procedure amendment]

[Submission date] October 26, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[Explanation of reference symbols] 1 bat 2 bat main body 3 tubular body 3a large diameter tubular body 4 hitting portion 5 capacitor 6 processing device 7 switch device 8 recessed portion 9 grip portion 10 tip portion 11 elastic member A end portion B magnetic field

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Teruyuki Sugita 3877-8 Takada, Yoro-cho, Yoro-gun, Gifu Mitsuno Co., Ltd.

Claims (4)

[Claims] 1. A bat characterized in that at least the outer surface of the hitting portion of the bat body is coated with a good electric conductor material by an electromagnetic machining method. 2. The bat according to claim 1, wherein the good conductor material is coated over the entire length of the bat body. 3. The bat according to claim 1, wherein the bat body is made of FRP, metal, wood, or a composite material thereof. 4. A cylindrical processing device which is formed of an electric conductor and into which a bat can be taken in and out, and a cylindrical body made of a good electric conductor material is loosely fitted and inserted into the bat body, and the cylindrical processing is performed. The magnetic field generated by the current applied to the device and the magnetic field generated by the secondary current induced in the good electric conductor material by the current repel each other, thereby deforming the good electric conductor material and bringing it into close contact with the bat body. And a method of forming a bat.