JP2006141442A - Wooden bat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wooden bat excellent in the durability and impact-resistance, etc., capable of inhibiting the deformation wear such as forming of dents, even though the bat is made of wood, so that the wooden bat itself hardly breaks or cracks, and allowing a user to stably bat with a long carry in an arbitrary direction for a long period of time. <P>SOLUTION: The wooden bat is characterized by the press-fit coating of a polycarbonate resin tube at least on the surface layer of a batting part. The press-fit coating of the polycarbonate resin tube means that the outer diameter of the batting part of the wooden bat is manufactured smaller than the outer diameter of the final product to be the base part of the batting part and the polycarbonate resin tube is set in and fixed so that the compressive stress is applied to the base part when the polycarbonate resin tube is press-fitted and coated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wooden bat for baseball or the like, and more particularly, to a wooden bat excellent in durability, impact resistance, etc., in which wear of a hitting portion of the wooden bat is suppressed.

Wooden bats used for ball games such as baseball and softball are generally formed of turquoise or cypress, and there are differences in durability and impact due to differences in materials, but metal bats such as aluminum alloys, The durability was poor compared to a fiber reinforced plastic vat obtained by impregnating and curing a matrix resin in a glass fiber.
Due to the poor durability of the wooden bat, repeated striking balls over a long period of time will cause the wooden bat to be deformed and wear hard such as dents, making it possible to provide a long-term hit in any direction with a stable flight distance. There wasn't.
Also, the wooden bat has poor impact, and if the impact force of the ball to be hit is too great, the compression deformed part at the time of hitting can not be restored and the wooden bat itself will be cracked or broken in the worst case and used for a long time I couldn't do it.
In particular, the wooden bat for knock batting is soft and has a problem of severe local deformation and wear.

Therefore, as an example of improving the durability of the wooden bat, Japanese Patent Application Laid-Open No. 2001-157725 discloses a technique in which a concave portion is formed in a hitting ball portion by a blast device and this concave portion is filled with a synthetic resin or the like.
However, the manufacturing process is complicated and the impact resistance is insufficiently improved.

JP 2001-157725 A

  Although the present invention is a wooden bat, it suppresses deformation wear such as dents, hardly cracks or breaks the wooden bat itself, has excellent durability, impact resistance, etc., and hits in any direction with a stable flight distance The purpose is to provide a wooden bat that can be provided for a long time.

The technical gist of the wooden bat according to the present invention is characterized in that at least the surface layer portion of the hit ball portion is press-fitted and covered with a polycarbonate resin cylinder.
Here, the polycarbonate resin cylinder is press-fitted and coated when the outer diameter of the hitting part of the wooden bat is made smaller than the outer diameter of the final product and is used as the base part of the hitting part. This means that the base portion is fitted and fixed so that a compressive stress is applied to the base portion.

  As a manufacturing means, a method in which the outer diameter of the base portion of the hitting ball portion is made slightly larger than the inner diameter of the polycarbonate resin cylinder, and the polycarbonate resin cylinder is mechanically press-fitted or inserted, or the polycarbonate resin cylinder As an example, there is a method in which the outer periphery is mechanically squeezed after being fitted and covered on the base portion of the hit ball portion, and the polycarbonate cylinder is pressure-bonded to the base portion of the hit ball portion.

In addition, for the purpose of making the polycarbonate resin cylinder more pressure-bonded to the hitting ball part or for the purpose of ease of production, in the wooden bat provided with the head part, the hitting ball part, the tapered part and the grip part, The surface layer portion is press-fitted with a polycarbonate resin cylinder, has an insertion hole along the core of the hitting ball portion, and the insertion portion provided in the head portion is press-fitted into the insertion hole on the hitting ball portion side. And
In this way, the insertion portion is provided along the core portion of the hitting ball portion, and the insertion portion provided in the head portion is press-fitted into the insertion hole on the hitting ball portion side, that is, so as to hit the wedge, so Not only is securely fixed, but also when the head portion is inserted and fixed, a compressive stress is applied to the base portion of the hit ball portion from the core portion toward the outer peripheral side, and the base portion of the hit ball portion and the polycarbonate resin cylinder are more closely attached. Acts like (crimping).

In the present invention, since the polycarbonate resin cylinder is press-fitted and coated (press-fitted) on the hitting portion of the wooden bat, the repulsive force is generated between the inner peripheral surface of the polycarbonate resin cylinder and the outer peripheral surface of the base portion of the hitting portion. Stubbornly stuck to the working state.
Therefore, the impact energy generated when hitting the ball with the hitting portion of the wooden bat propagates to the entire polycarbonate resin cylinder subjected to compressive stress, and not only reacts as a large restoring force but also the inner circumference of this cylinder. Prevents rubbing from occurring between the surface and the outer peripheral surface of the base of the hitting ball part, and suppresses wear and deformation of the wood part.
Thereby, the impact property of the hit ball part is improved, and the service life of the wooden bat is extended by the wear resistance of the polycarbonate.

FIG. 1 (a) shows a front view of a wooden bat 10 as an embodiment according to the present invention, and FIG. 1 (b) shows a cross-sectional view thereof.
FIG. 2 is an exploded perspective view.
The wooden bat 10 includes a head portion 11, a hit ball portion 12, a taper portion 13, and a grip portion 14.
As shown in FIG. 2, the hitting portion 12 of the wooden bat 10 is a base portion 12 a of the hitting portion 12 in which the thickness equivalent to the thickness of the polycarbonate resin cylinder 15 is reduced.
Here, the inner diameter 15a of the polycarbonate resin cylinder 15 (hereinafter referred to as the cylinder 15) is made smaller than the outer diameter 12b of the base portion of the hitting ball portion 12, and the base portion is formed by press-fitting the cylinder 15 into the base portion. A compressive stress is generated on the outer periphery of 12a.
As a result, the cylindrical body is press-fitted onto the hitting portion of the bat.
Further, the outer diameter 15b of the cylindrical body 15 is manufactured so as to have a final product shape after assembly, and a locking peripheral wall 13a for restricting the insertion allowance of the cylindrical body 15 is formed on the tapered portion 13 side.

Next, the substantially cylindrical insertion portion 11 a formed in the head portion 11 is press-fitted into the insertion hole 12 c formed along the core portion of the hit ball portion 12.
The inner diameter of the insertion hole 12c is slightly smaller than the outer diameter of the insertion part 11a on the head part 12 side, and the outer diameter of the insertion part 11a is gradually changed toward the grip side.
The head portion 11 may be pressed into the hitting ball portion 12 after the cylinder 15 is pressed into the hitting ball portion 12. However, the cylinder 15 may be press-fitted simultaneously with the press-fitting of the head portion 11.

  When the cylindrical body 15 is press-fitted into the base portion 12a of the hit ball portion 12 and adjusted to the final product shape, if the outer periphery of the cylindrical body 15 is squeezed, the inner peripheral surface of the cylindrical body 15 is further applied to the base portion 12a of the hit ball portion 12 Is in close contact.

FIG. 3 shows a cross-sectional view of a head batted ball unit integrated wooden bat 20 (hereinafter referred to as a wooden bat 20) having a form different from the above form, and FIG.
The wooden bat 20 includes a head portion 21, a hit ball portion 22, a taper portion 23, and a grip portion 24.
As shown in FIG. 4, the hitting portion 22 of the wooden bat 20 is a base portion 22 a in which the thickness corresponding to the thickness of the polycarbonate resin tubular body 25 extends from the head portion 21 to the hitting portion 22.
Here, the inner diameter 25a of the polycarbonate resin cylinder 25 (hereinafter referred to as the cylinder 25) is made smaller than the outer diameter 22b of the base portion of the hitting ball portion 22, and the cylinder 25 is press-fitted (press-fitted). As a result, a compressive stress is generated on the outer periphery of the base portion 22a.
The outer diameter 25b of the cylindrical body 25 is manufactured so as to have a final product shape after assembly, and a locking peripheral wall 23a for restricting the insertion allowance of the cylindrical body 25 is formed on the tapered portion 23 side.
And if the cylinder 25 is press-fitted and inserted into the base portion 22, and the cylinder 25 is press-fitted until it is locked by the locking peripheral wall, the wooden bat 20 is completed. As with the wooden bat 10, the cylinder 25 is press-fitted into the base portion 22a of the hitting ball portion 22 and then adjusted to the final product shape. The inner peripheral surface of the body 25 is in close contact.

  The wooden bats 10 and 20 of these examples are excellent in durability, and even when hitting 10,000 balls, deformation hits such as dents did not occur in the hitting ball portions 13 and 23, and also excellent in impact properties. Even if the balls thrown at a speed of 150 km / s are hit in succession by 20 balls, the wooden bats 10 and 20 themselves are not broken without causing a crack. For this reason, these wooden bats 10 and 20 are classified into ball types such as baseball and softball, types of use such as knocking and full swing at the time of hitting, and types of balls such as soft balls and hardened balls with strong impact force. Regardless of its durability, the ball striking parts 13 and 23 are resistant to deformation and wear such as dents and can maintain their restoring force, so they can provide long-term hits in any direction with a stable flight distance and excellent impact. The wooden bats 10 and 20 themselves can be used for a long time without causing cracks or breaking.

The wooden bat which concerns on this invention is shown, (a) is a front view, (b) is a sectional view. The disassembled perspective view of the wooden bat which concerns on this invention is shown. Sectional drawing of the head part hitting | ball-hit part integrated wooden bat 20 of the wooden bat which concerns on this invention is shown. The isolation | separation perspective view of the head part hitting ball part integrated wooden bat 20 is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Wooden bat 11 Head part 11a Insertion part 12 Hitting ball part 12a Base part 12b Base part outer diameter 12c Insertion hole 13 Taper part 13a Locking peripheral wall 13b Insertion hole 14 Grid part 15 Polycarbonate resin cylinder 15a Inner diameter 15b of cylinder The outer diameter 20 of the head part hitting part integrated wooden bat 21 The head part 22 The hitting part 22a The base part 22b The base part outer diameter 23 The taper part 23a The locking peripheral wall 24 The grip part 25 The polycarbonate resin cylinder 25a The inner diameter 25b of the cylinder Outside diameter

Claims (2)

  A wooden bat, wherein at least a surface layer portion of a hitting ball portion is press-fitted with a polycarbonate resin cylinder.   In a wooden bat provided with a head part, a hitting part, a tapered part, and a grip part, a polycarbonate resin cylinder is press-fitted on the surface layer part of the hitting part, and an insertion hole is provided along the core part of the hitting part. A wooden bat, wherein the provided insertion portion is press-fitted into an insertion hole on the hitting ball portion side.

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