JP3310733B2 - bat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bat used for baseball or softball, in which a hard core material formed of a hard resin or the like is fitted into a hollow bat body at a location corresponding to a hitting ball portion, , About metal bats.

[0002]

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

[0003]

According to the conventional bat described above, a plurality of cylindrical members slide on each other when hitting a ball,
Since each of the cylindrical members tends to be elastically deformed individually, there is a disadvantage that the amount of deformation of the entire core material at the time of hitting the ball is large, and the flight distance of the hit ball cannot be effectively extended. In order to solve this point, for example, it is conceivable that a plurality of cylindrical members are integrally formed and inserted into the bat main body. In this case, at the time of hitting the ball, the cylindrical member is in contact with the inner peripheral surface of the bat main body. Since the cylindrical member is easily deformed in the radial direction, it is necessary to increase the thickness of the cylindrical member in contact with the inner peripheral surface of the bat body to increase its bending rigidity. is there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and its main problem is to increase the weight of a bat by devising a shape of a core material to be fitted into a portion corresponding to a hitting portion of a bat body. While effectively increasing the flight distance of the hit ball , and at the same time,
A bar that facilitates the press-fitting of the core material at the same time.
The point is to provide

[0005]

According to a first aspect of the present invention, there is provided a bat in which a hard core material is fitted at a location corresponding to a hitting portion in a hollow bat body. A shaft member disposed along the bat shaft center, and a plurality of circumferential portions on an outer peripheral surface of the shaft member.
And a plate-like member extending in a direction orthogonal or substantially orthogonal to the bat axis , and an inner peripheral surface of the bat body.
And Pressed belt with a pressing surface which plate is configured by integrally molding a hard resins, further, each of the strip is either tip of the shaft member
Extend along the inner peripheral surface of the bat body
And the core material is pressed into the bat body in a state of compressing the plate-like member in a direction along the plate surface.

[0006]

[Action] Radially from a plurality of circumferential positions on the outer peripheral surface of the shaft member.
A strip is integrally formed at the tip of the plate member to be extended.
That the rigid resin core member, and pressed into the bat body in a state where the plate-like member is compressed in the direction along the plate surface, the impact of hitting
Force is transmitted to the radial direction centering on the shaft member through the plate member.
Since the seeds are sowed, the entire core material is unlikely to be bent and deformed when hit.

In addition, a bat book is provided at the tip of the plate member.
A strip with a pressure contact surface pressed against the inner peripheral surface of the body,
Extends circumferentially in a cantilevered state along the inner peripheral surface of the bat body
Bat book located between adjacent plate members
The body part can be reinforced, and
The end side elastically deformed inward in the radial direction due to the impact force at the time of hitting the ball
At that time, the elastic restoring force at each free end at that time
Will work.

Further, the butt is pressed against the inner peripheral surface of the bat body.
The press-contact surface of the strip is interrupted in the circumferential direction, and
Does it extend in the circumferential direction in a cantilevered state with respect to the tip
When pressing the core material into the bat body,
Each band plate is compared with the case where
Follows radially in response to changes in the shape of the inner peripheral surface of the bat body
Easy to deform.

[0009]

Accordingly, it is difficult for the entire core material to be deformed at the time of hitting the ball.
And the elastic restoring force at the free end side of each strip
Bat weight increase.
While, the flight distance of the hit ball can be effectively extended,
Moreover, the work of press-fitting the core material into the bat body has been simplified.
Can also be achieved .

[0010] The characteristic structure of the bat according to claim 2 of the present invention.
Is a cylindrical member in which the shaft member is disposed along the butt shaft center.
The inside of the member is divided into a plurality of through holes in the circumferential direction.
Formed by forming a plurality of partition walls along the radial direction.
There are points.

[0011]

According to the above construction, when an impact force produced when hitting the ball is propagated in the tubular member of the shaft member via the plate-like member, further,
The inside of the cylindrical member is divided into a plurality of through holes in the circumferential direction.
Propagation to the butt shaft side through multiple radial partition walls
can do.

[0012]

[Effect of the Invention] Does it therefore, suppress an increase in batt weight
In addition, it can extend the distance of the hit ball more effectively
You.

[0013] The characteristic structure of the bat according to claim 3 of the present invention.
Is located at an approximate center position of the core material in the bat axis direction.
The diameter is between the tip of the bat body and
Slightly larger than the inner diameter, and both ends of the core material in the butt axis direction
The outer diameter of the ball is equivalent to the ball hitting part from the tip of the bat body.
So that it is slightly smaller than the inside diameter
The point that the pressure contact surface is formed in an arcuate surface in the
is there.

[0014]

[Action] Pressing a hard resin core into the bat body
At any time, any one end of the core material is easily inserted into the opening of the bat body.
As well as the orientation of the core
Need not be considered, and on the inner peripheral surface of the bat body
The pressure contact surface of the strip that is pressed against
And extend in the circumferential direction in a cantilevered state with respect to the tip
Press the core into the bat body
When a plurality of strips are integrally formed in a cylindrical shape.
Each band plate corresponds to the shape change of the inner peripheral surface of the bat body.
Easy to follow and deform in the radial direction, reducing sliding contact resistance during press-fitting
Can be

[0015]

Accordingly, the press-fit into the bat body is
Press-fitting work of the core material to reinforce the hitting part of the main body
Can be performed efficiently and easily.

[0016]

First Embodiment FIG. 1 shows a core member 2 made of a polycarbonate resin that is hard and excellent in impact resistance is fitted into a place A corresponding to a hitting portion in a hollow aluminum alloy bat body 1. 1 shows a metal bat 3 which is open. As shown in FIGS. 2 and 3, the core member 2 extends in a direction perpendicular to the butt shaft core P and a shaft member 4 disposed along the butt shaft core P at the radial center. The plate-shaped member 5 is integrally formed, and the shaft member 4 has an inner peripheral side of a cylindrical member 9 extending in parallel along the bat axis P inside the shaft member 4. Partition wall 8 formed radially in the direction
And a large number of through holes 7 are arranged in the circumferential direction, and the thickness t is about 2 mm on the outer peripheral surface side of the shaft member 4.
Six plate-like members 5 having a width h of about 12 mm at the center of the core material 2 in the direction of the bat axis P are extended parallel to the bat axis P in the same phase as the partition wall 8 and radially. The core member 2 is pressed against the inner peripheral surface of the bat main body 1 in a state where the core material 2 is fitted to the inner peripheral surface of the location A corresponding to the hitting portion of the bat main body 1 along the tip end of each of the plate members 5. The strips 6 each having a pressure contact surface 6a are integrally formed.
Along the inner peripheral surface of the bat body 1 from the tip of the member 4
And cantilevered in both directions . The strip 6
Can distribute the pressing force from the plate member 5 to the inner peripheral surface of the bat main body 1 over a wide range of the inner peripheral surface of the bat main body 1. The thickness of the tubular member 9, the thickness of the partition wall 8, and the maximum thickness of the strip 6 are also formed to be substantially the same as the thickness t of the plate member 5.

As shown in FIG. 4, the front end of the bat main body 1 has a substantially constant inner diameter L from the front end of the bat main body 1 to a location A corresponding to the hitting portion before the core material 2 is fitted. After the core material 2 is press-fitted into a location A corresponding to the hitting portion, the tip opening 1a is squeezed and closed by head spinning. Before the core material 2 is fitted into the bat body, the press-contact surface 6a of the band plate 6 extends along the butt axis P direction, and a substantially central portion in the butt axis P direction is slightly outside the core material 2 in the radial direction. The maximum outer diameter of the core material 2, that is, the dimension L 1 between the maximum curved portions of the opposing pressure contact surfaces 6 a of the strips 6 is the same as the hitting portion A of the bat body 1. The size is formed to be about 1 mm larger than the inner diameter L. Both ends of the pressure contact surface 6a in the butt axis P direction are:
A tapered surface 6b is formed so as to be easily press-fitted into the inner peripheral surface of the bat main body 1, and the minimum outer diameter of the tapered surface 6b, that is, the maximum in the 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 main body 1 and the location A corresponding to the hitting portion. Then, the core 2 is inserted into the opening 1a at the tip of the bat main body 1 by inserting the tapered surface 6b of the strip 6 into the opening 1a, and further pressed into the bat main body 1 by a press-fitting machine such as a press machine. In a state where the plate-shaped member 5 is compressed in the direction along the plate surface, the plate-shaped member 5 is press-fitted and fixed to a location A corresponding to a hitting portion in the bat main body 1.

The length H in the butt axis P direction is 90 mm.
The core material 2 made of a polycarbonate resin (manufactured by Teijin Chemicals Ltd., trade name: Panlite) is formed with a diameter A of 59.5 mm and a thickness of 2 m at a location A corresponding to a hitting portion.
aluminum alloy (standard number JIS-H
-400, a part corresponding to a length of 90 mm in the bat axis P direction in which the core material 2 is present is cut out of the bat 3 press-fitted into the bat body 1 made of JIS 6061) to obtain a test piece 10. As a result of performing a compression test by applying a load F from the radial direction to the radially outer peripheral surface of the test piece 10, as shown in FIG. When the compression test is performed with the core 2 fixed in the posture along the plate surface, the core 2 is damaged by a load F of about 1320 Kgf, and the plastic deformation of the test piece 10 starts, as shown in 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-like members 5 of the core material 2, the core material 2 is damaged by a load F of about 1180 kgf, The plastic deformation of the test piece 10 started. In addition, in order to compare with the above test, an aluminum alloy having no core material pressed therein (standard number JIS-H-400, JIS designation 606).
1) A part corresponding to a ball hitting portion, which is 90 mm in length in the direction of the bat axis P, is cut out from the bat body made as a test piece, and a compression test is performed by applying a load F from the radial direction to the outer peripheral surface in the radial direction. As a result, the plastic deformation of the test piece started at a load F of about 300 Kgf, and when the load F exceeded about 520 Kgf, the test piece was crushed.

[Other Embodiments] The core material is a metal material such as an aluminum alloy, or an ABS material, if the material is hard and has excellent impact resistance.
Resin, polyethylene, polypropylene, polyurethane,
It may be integrally formed of a resin material such as nylon. 2. The number of plate members and band plates is not limited to six, but may be any number that can press the inner peripheral surface of the bat body substantially evenly. 3. The plate-shaped member may be spirally provided on the outer peripheral surface of the shaft member. 4. The shaft member may be formed in a cylindrical shape, a polygonal cylindrical shape, or the like. Further, the shaft member may be formed solid or may be formed of a crossing portion where a plurality of plate-like members cross in the radial direction. 5. The core material may be press-fitted into the bat body having an inner diameter smaller from the tip of the bat body to the location corresponding to the hitting portion, the inner diameter of which is smaller toward the location corresponding to the hitting portion.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a front view of a bat.

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

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

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

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Bat main body 2 Core material 4 Shaft member 5 Plate member 6 Strip plate 6a Pressure contact surface 7 Through hole 8 Partition wall 9 Cylindrical member A Location equivalent to hitting portion P Bat core

Claims (3)

(57) [Claims] 1. A bat in which a hard core material (2) is fitted in a location (A) corresponding to a hitting portion in a hollow bat body (1), wherein the core material (2) is a bat shaft core. (P) and a shaft member (4) arranged along (P) and the outside of the shaft member (4).
A plate-like member (5) extending in a direction perpendicular or substantially perpendicular to the bat axis (P) at a plurality of positions in the circumferential direction of the peripheral surface and the inner peripheral surface of the bat body (1); Pressed
And a band plate (6) having a pressure contact surface (6a) formed by hard molding with a hard resin.
Along the inner peripheral surface of the bat body (1) from the tip of the material (4)
While extending in a cantilevered state in the circumferential direction,
A bat in which a core material (2) is pressed into the bat body (1) while compressing the plate-like member (5) in a direction along a plate surface. 2. The shaft member (4) is provided with a butt shaft core (P).
Inside the tubular member (9) arranged along
In a plurality of radial directions partitioned into a plurality of through holes (7) in the circumferential direction
2. The bat according to claim 1, wherein the bat is formed by forming a partition wall along the same . 3. The butt shaft (P) direction of said core material (2).
The outer diameter at the approximate center position of the tip of the bat body (1)
Than the inner diameter (L) between the ball and the hitting part (A)
Slightly larger, and both sides of the core material (2) in the butt axis (P) direction
The outer diameter at the end is hit from the tip of the bat body (1).
A little smaller than the inner diameter (L) over the part (A)
So that the pressure contact surface (6a) of each band plate (6) is
The bat according to claim 1 , wherein the bat is formed in an arcuate surface in the direction of the core (P) .