JP2524265B2 - Metal bat and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal bat used in baseball and a method for manufacturing the same.

[0002]

2. Description of the Related Art When a metal bat is made of an aluminum material, it is made of a hollow aluminum material as shown in FIG.
It is often the case that the grip end 2 made of an aluminum material is attached to this by welding. The main body 1
Has its tip closed as a head portion 3, and a hitting portion 4 having substantially the same diameter is formed in the vicinity thereof, and a small-diameter grip portion 6 is provided via a taper portion 5.

In such a conventional metal bat, since the whole is a hollow body, the deformation of the ball upon hitting is large, and it is difficult for the ball to travel a long distance. Therefore, as shown in FIG. 12, a filling 7 such as a urethane foam or a urethane chip is filled in a portion of the main body 1 that is ahead of the hitting portion 4, or as shown in FIG. 13, for reinforcing the inner wall surface of the main body 1. The ribs 8 may be formed to increase the strength.

[0004]

However, the one in FIG. 12 is effective in reducing the amount of deformation at the time of hitting, but is not useful for increasing the recovery speed against deformation, and the one in FIG. 13 is also effective at hitting. Since the entire bat is elastically deformed and the recovery speed of the deformation is slow, the flight distance is not increased.

An object of the present invention is to eliminate the disadvantages of the conventional example, and to provide a metal bat which increases the repulsive force of the bat upon hitting and allows the ball to fly more, and a method of manufacturing the same.

[0006]

In order to achieve the above object, the present invention connects an inner tube concentric with the bat body, an outer peripheral surface of the inner tube, and an inner wall surface of the hitting section in a hitting section of a hollow bat body. Radial ribs are provided, and the ball striking portion, the inner pipe, and the radial rib are integrally formed as a member that is integrally continuous with each other, or a multiple pipe of an outer pipe and an inner pipe is used to form an outer pipe and an inner pipe. A hollow tube having ribs integrally provided radially between the outer tube, the inner tube, and the radial rib is integrally formed with a stamped material of an aluminum alloy as a member integrally continuous with each other. Cut the hollow tube to an appropriate length, perform boring from the openings at both ends, remove the inner tube and ribs except for the portion corresponding to the hitting portion, and the step rearward from this hitting portion and Formed on butt taper and grip by swaging It is an gist of Rukoto.

[0007]

According to the present invention as set forth in claim 1, since the outer pipe, the radial ribs and the inner pipe are integrally formed and integrally formed as members that are integrally continuous with each other, the materials are unified,
The outer pipe, the inner pipe, and the rib are firmly bonded to each other to obtain a product. The core portion of the ball striking portion in the bat body, which is lined with a small space partitioned by the inner tube and ribs, is firmly formed by integral molding, so the presence of this core portion prevents the bat from elastically deforming when hit. By reducing the amount, the recovery speed of the elastic deformation can be increased. As a result, it becomes possible to increase the speed of hitting.

According to the present invention of claim 2, claim 1
In order to obtain the metal bat described, the outer tube, the inner tube, and the rib are integrally formed as mutually continuous members, so there is no troublesome work such as separately connecting each member, and a short number of steps Can be easily manufactured, and a strong hitting part can be obtained as an integrally molded product. Easy to manufacture with few steps.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a partially cutaway side view showing a first embodiment of an aluminum metal bat of the present invention. The bat has a main body 1 formed of a hollow aluminum material as described in FIG. The grip end 2 made of a material is welded, and the body 1 has the tip closed as a head portion 3, and a hitting portion 4 having substantially the same diameter is formed in the vicinity thereof, and a small diameter grip portion 6 is provided via a taper portion 5. .

The bat of the present invention has a double tube structure having an inner tube 9 concentric with the bat body 1 in the hitting section 4 of the hollow bat body 1, and the outer peripheral surface of the inner tube 9 and the hitting section. Four
Ribs 10 that connect to the inner wall surface of (1) are provided radially in the circumferential direction of the main body 1.

The rib 10, the main body 1 and the inner pipe 9 are integrally formed as members which are integrally continuous with each other.
The main body 1 and the inner pipe 9 are present at equal intervals so as to divide the body 1 and the inner pipe 9 at equal intervals, and in the main body 1, a core portion 11 is formed which is partitioned by the inner pipe 9 and the ribs 10 to form a small space.

FIGS. 3 to 6 show the second to fifth embodiments of the present invention, and thus the sectional shape of the inner tube 9 and the number of ribs 10 can be variously selected.

Next, a method of manufacturing the metal bat will be described. 7 to 10 show each step in the manufacturing method.

As shown in FIG. 7, the outer pipe 12 and the inner pipe 9 are multiple pipes, and ribs 10 are integrally provided radially between the outer pipe 12 and the inner pipe 9. The rib 9 and the rib 9 are integrally formed as a hollow tube 13 made of an aluminum alloy stamped material. Then, the hollow tube 13 is cut into an appropriate length.

Then, as shown in FIG. 8, the hollow pipe 13 is bored at both ends to remove the inner pipe 9 and the rib 10 except the portion corresponding to the hitting portion 4. By doing so, the inner pipe 9 is provided only inside the hitting portion 4 as described above.
The core portion 11 partitioned by the ribs 10 can be formed.

After this, as shown in FIG. 9, the area behind the hitting portion 4 is stepped by a drawing machine, and further swaging is performed as shown in FIG. Form part 6. Thereafter, although not shown in the drawing, the tip end is used as a head part to integrally close by spinning, and a grip end formed by drawing from a plate material is attached to the tip of the grip part 6 by welding, and then heat treatment is performed to obtain a required strength. It is the same as the conventional method to obtain a finished bat product by applying it and subjecting it to buffing and alumite treatment.

[0017]

As described above, in the metal bat and the method for manufacturing the same according to the present invention, the outer tube, the radial ribs, and the inner tube are integrally formed as a continuous member. The outer tube, the inner tube and the rib are obtained as a solid and continuous product. The core portion of the ball striking portion in the bat body, which is lined with a small space partitioned by the inner tube and ribs, is firmly formed by integral molding, so the presence of this core portion prevents the bat from elastically deforming when hit. By reducing the amount, the recovery speed of the elastic deformation can be increased. As a result, it is possible to increase the speed of hitting the ball.

Further, in the method for manufacturing a metal bat of the present invention, the outer tube, the inner tube and the rib are integrally formed as a continuous member to obtain such a metal bat,
It is possible to obtain a hitting portion having high strength as an integrally-molded product, which does not require complicated work such as connecting each member separately and can be easily manufactured in a shorter time and with fewer steps as compared with the related art.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a first embodiment of a metal bat according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a vertical cross-sectional front view of a main part showing a second embodiment.

FIG. 4 is a vertical sectional front view of an essential part showing a third embodiment.

FIG. 5 is a vertical cross-sectional front view of a main part showing a fourth embodiment.

FIG. 6 is a vertical cross-sectional front view of essential parts showing a fifth embodiment.

FIG. 7 is a perspective view showing a first step of the method for manufacturing a metal bat of the present invention.

FIG. 8 is a side view showing a second step of the method for manufacturing a metal bat of the present invention.

FIG. 9 is a side view showing a third step of the method for manufacturing a metal bat of the present invention.

FIG. 10 is a side view showing a fourth step of the method for manufacturing a metal bat of the present invention.

FIG. 11 is a partially cutaway side view showing a conventional example.

FIG. 12 is a partially cutaway side view showing another conventional example.

FIG. 13 is a vertical sectional front view showing still another conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main body 2 ... Grip end 3 ... Head part 4 ... Hitting part 5 ... Tapered part 6 ... Grip part 7 ... Filling material 8 ... Rib 9 ... Inner tube 10 ... Rib 11 ... Core part 12 ... Outer tube 13 ... Hollow tube

Claims (2)

(57) [Claims] 1. A hollow bat body is provided with an inner pipe concentric with the bat body, and radial ribs connecting the outer peripheral surface of the inner pipe and the inner wall surface of the hitting portion in the hitting portion of the bat body. Is a metal bat that is integrally molded to be a member that is integrally continuous with each other. 2. A hollow tube comprising an outer tube and an inner tube, wherein the outer tube and the inner tube are integrally provided with ribs radially. It is formed by integrally molding a stamped material of aluminum alloy as an integrally continuous member, cuts the hollow tube to an appropriate length, and boring is performed from the openings at both ends to remove the portion corresponding to the hitting portion. The inner tube and the ribs are removed, and a portion behind the hitting portion is formed into a taper portion and a grip portion of the bat by step processing and swaging, and a method for manufacturing a metal bat.