JPH0788213A - Bat - Google Patents

Abstract

PURPOSE:To elongate the flying distance of a struck ball effectively by arranging so that the whole core is not likely to deform when the ball is struck, and suppressing increment of the weight of a bat. CONSTITUTION:In the body 1 of a bat structured hollow, a shafting member 4 is instaled along the bat axis P in the area of the bat body which is expected to strike a ball, while plate members 5 extending in the direction perpendiculaly intersecting the bat axis P are installed along the outside surface of the shafting member 4, and a core 2 of hard nature is formed through single piece molding of these shafting member 4 and plate members 5 and is fitted by pressure into the bat body 1 in the condition that the plate members 5 are compressed in the direction along the plate surfaces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bat for use in baseballs and softballs, in which a hard core material made of a hard resin or the like is fitted in a hollow bat body at a portion corresponding to a hitting ball portion, particularly , Regarding metal bats.

[0002]

2. Description of the Related Art A bat is intended to improve the strength and the flight distance of a hit ball by fitting a hard core material into a part corresponding to the hit ball in the bat body. However, it has been proposed that a plurality of cylindrical members made of hard resin are bundled and fitted into a portion of the bat body corresponding to a hitting ball portion (for example, see Japanese Utility Model Publication No. 1-40532).

[0003]

According to the above conventional bat, a plurality of cylindrical members are slid on each other when hitting a ball,
Since each of the cylindrical members individually tries to elastically deform, the amount of deformation of the entire core material at the time of hitting a ball is large, and there is a drawback that the flight distance of the ball cannot be effectively extended. In order to solve this point, for example, it is conceivable that a plurality of cylindrical members are integrally molded and inserted into the bat body, but in this case, they are in contact with the inner peripheral surface of the bat body at the time of hitting the ball. Since the cylindrical member is easily deformed in the radial direction, it is necessary to increase the bending rigidity by increasing the wall thickness of the cylindrical member that is in contact with the inner peripheral surface of the bat body. is there. The present invention has been made in view of the above circumstances, by devising the material and shape of the core material fitted into the hitting portion of the bat body, the hitting ball while suppressing an increase in the bat weight. The purpose is to be able to effectively increase the flight distance of.

[0004]

A characteristic structure of the present invention for achieving the above object is a bat in which a hard core material is fitted in a portion corresponding to a hitting portion in a hollow bat body,
The core member, a shaft member arranged along the bat shaft core,
The plate member is integrally formed with the plate member extending along the outer peripheral surface of the shaft member in a direction orthogonal or substantially orthogonal to the bat axis, and the plate member is formed along the plate surface. The point is that it is pressed into the bat body in a compressed state. The plate-shaped member may be integrally formed with a strip plate having a pressure contact surface that is in pressure contact with the inner peripheral surface of the bat body. A plurality of the plate-shaped members may extend in parallel or substantially parallel to the butt axis.

[0005]

A hard core material integrally formed with a plate-shaped member extending in a direction orthogonal or substantially orthogonal to the butt shaft core along the outer peripheral surface of the shaft member is provided on the plate surface. Since it is pressed into the bat body in a state of being compressed in the direction along which the pressure at the time of hitting is transmitted in the radial direction centered on the shaft member through the plate-shaped member, the entire core material is hit at the time of hitting. Hard to bend and deform. The bat in which the plate member is integrally formed with a strip plate having a pressure contact surface that is pressed against the inner peripheral surface of the bat body is because the bat body portion between the plate members is reinforced by the strip plate. The bat body is unlikely to deform in the thickness direction when hitting a ball. A bat having a plurality of plate-shaped members extending in parallel or substantially parallel to the bat shaft core, even if the core member is inserted into the bat body from the bat shaft core direction, the plate-shaped member is deformed in the thickness direction. Hateful.

[0006]

In the bat according to the first aspect of the present invention, the entire core material is unlikely to be deformed at the time of hitting the ball, so that the flight distance of the hit ball can be effectively extended while suppressing an increase in the weight of the bat. According to the bat of the second aspect, the entire bat is unlikely to be deformed at the time of hitting the ball, so that the flight distance of the hit ball can be further effectively extended. In the bat according to the second aspect, the core material can be easily inserted into the bat body from the axial direction of the bat.

[0007]

【Example】

[First Embodiment] FIG. 1 shows a metal bat in which a core material 2 made of a polycarbonate resin which is hard and has excellent impact resistance is fitted in a hitting portion A in a bat body 1 made of a hollow aluminum alloy. 3 is shown. As shown in FIGS. 2 and 3, the core member 2 extends in a direction orthogonal to the shaft member 4 disposed along the butt shaft core P at the center in the radial direction. The plate member 5 and the shaft member 4 are integrally formed with each other, and the shaft member 4 has a diameter around the butt shaft core P on the inner peripheral side of a cylindrical member 9 extending in parallel inside the bat shaft core P. A large number of through holes 7 are arranged in the circumferential direction by partition walls 8 formed radially in the direction, and the thickness t is about 2 mm and the width h is the core material on the outer peripheral surface side of the shaft member 4. Six plate-shaped members 5 of about 12 mm at the center of the bat axis P in the direction of 2 are extended in parallel and radially along the bat axis P in the same phase as the partition wall 8. Along the inner peripheral surface of the bat body 1 with the core material 2 fitted in the inner peripheral surface of the hitting ball equivalent portion A of the bat body 1 along the respective tip portions of And the strip 6 having a pressing surface 6a to be pressed against are integrally formed. still,
The strip plate 6 can disperse the pressure contact force from the plate-shaped member 5 to the inner peripheral surface of the bat body 1 over a wide range of the inner peripheral surface of the bat body 1. In addition, the thickness of the tubular member 9 and the partition wall 8
And the maximum thickness of the strip plate 6 are also formed to be substantially the same as the thickness t of the plate member 5.

As shown in FIG. 4, the tip portion of the bat body 1 is a cylinder having a substantially constant inner diameter L from the tip of the bat body 1 to a portion A corresponding to the hitting portion before the core material 2 is fitted. After the core material 2 is press-fitted into the hitting ball-corresponding portion A, the tip opening 1a is squeezed and closed by head spinning. In the state before the core material 2 is fitted into the bat body, the pressure contact surface 6a of the strip plate 6 is along the butt shaft core P direction, and the substantially central portion in the butt shaft core P direction is slightly outside in the radial direction of the core material 2. The maximum outer diameter of the core material 2, that is, the dimension L1 between the maximum protruding portions of the pressure contact surfaces 6a of the opposite strips 6, which is formed in an arcuate shape protruding from the butt body 1, It is formed to have a size about 1 mm larger than the inner diameter L. Both ends of the pressure contact surface 6a in the butt shaft core P direction are
A tapered surface 6b is formed so as to be easily press-fitted to the inner peripheral surface of the bat body 1, and the minimum outer diameter of the tapered surface 6b, that is, the maximum butt axis P direction between the tapered surfaces 6b of the strips 6 facing each other. The dimension L2 of the outer end is formed to be about 1 mm smaller than the inner diameter L between the tip of the bat body 1 and the portion A corresponding to the hitting portion. Then, the core material 2 is inserted into the opening 1a at the tip of the bat body 1 with the taper surface 6b portion of the strip plate 6, and is further pressed into the bat body 1 by a press-fitting machine such as a press machine. In a state in which the plate member 5 is compressed in the direction along the plate surface, the plate member 5 is press-fitted and fixed to the hitting ball equivalent portion A in the bat body 1.

The length H of the bat shaft P direction is 90 mm.
The core material 2 made of a polycarbonate resin (manufactured by Teijin Chemicals, Ltd., trade name: Panlite) that is formed on the base plate 2 has an inner diameter L of a hitting ball equivalent portion A of 59.5 mm and a thickness of 2 m.
Aluminum alloy (standard number JIS-H
-400, the bat body made of JIS No. 6061) is press-fitted into the bat body 1, and a portion corresponding to a length of 90 mm in the bat axis P direction in which the core material 2 is present is cut out to obtain a test piece 10. As a result of performing a compression test by applying a load F from the radial outer peripheral surface of the test piece 10 in the radial direction, as shown in FIG. 5A, the test piece 10 has a plate-shaped member 5 whose loading direction is the core material 2. When the compression test is performed by fixing it in the posture along the plate surface of No. 2, the core material 2 is damaged by the load F of about 1320 Kgf, and the plastic deformation of the test piece 10 starts, as shown in (b) of FIG. When the compression test is performed by fixing the test piece 10 in a posture in which the load direction passes through substantially the center between the adjacent plate-shaped members 5 of the core material 2, the core material 2 is damaged by the load F of about 1180 Kgf, The plastic deformation of the test piece 10 started. Further, in order to compare with the above test, an aluminum alloy in which the core material is not press-fit (standard number JIS-H-400, JIS designation 606
1) From the bat body made of 1), a portion corresponding to a hitting ball portion having a length of 90 mm in the bat axis P direction is cut out to form a test piece, and the test piece is subjected to a compression test by applying a load F from the outer peripheral surface in the radial direction to the test piece. As a result, the plastic deformation of the test piece started at a load F of about 300 Kgf, and the test piece was crushed when the load F exceeded about 520 Kgf.

Other Embodiments 1. The core material is a metal material such as an aluminum alloy or ABS if it is a material that is hard and has excellent impact resistance.
Resin, polyethylene, polypropylene, polyurethane,
It may be integrally molded with a resin material such as nylon. 2. The number of plate members and strips is not limited to six, and may be any number that can press the inner peripheral surface of the bat body substantially evenly. 3. The plate member may be spirally extended on the outer peripheral surface of the shaft member. 4. The band plate may be omitted, and the inner peripheral surface of the bat body corresponding to the hitting portion may be pressed against the radial tip end surface of the plate member. 5. The shaft member may be formed in a cylindrical shape, a polygonal tubular shape, or the like, and may further be formed to have a solid inside or a crossing portion where a plurality of plate-shaped members cross in the radial direction. 6. The core material may be press-fitted into the bat body formed such that the inner diameter of the bat body between the tip of the bat body and the portion corresponding to the hitting portion is smaller toward the portion corresponding to the hitting portion.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

1] Front view of a bat

FIG. 2 is a sectional view of a portion corresponding to a hitting portion.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view showing a method of loading a core material.

FIG. 5 is a schematic diagram showing a test method.

[Explanation of symbols]

 1 Bat Main Body 2 Core Material 4 Shaft Member 5 Plate Member 6 Strip Plate 6a Pressure Contact Surface A Hitting Ball Corresponding Part P Bat Shaft Core

Claims (3)

[Claims] 1. A bat in which a hard core material (2) is fitted in a hitting portion (A) in a hollow bat body (1), wherein the core material (2) is a bat shaft core. A shaft member (4) disposed along (P), and a plate extending along the outer peripheral surface of the shaft member (4) in a direction orthogonal or substantially orthogonal to the butt shaft core (P). A bat, which is formed by integrally molding the plate-shaped member (5) and is press-fitted into the bat body (1) in a state of compressing the plate-shaped member (5) in the direction along the plate surface. 2. A strip plate (6) having a pressure contact surface (6a) pressed against the inner peripheral surface of the bat body (1) is integrally formed on the plate member (5). The bat according to item 1. 3. The plurality of plate-shaped members (5) are extended in parallel or substantially parallel to the butt shaft core (P).
Or the bat according to 2.