JP2002011131A - Bat for baseball or softball - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a bat that does not show reduction in rebound performance even whan a ball is hit at a point off the sweet spot, has a wide sweet area, and can possibly reduce the number of foul balls. SOLUTION: The diameter of the position of a sweet spot 3 of a batting part 2 is smaller than that of another side of the batting ball 2, and the shape in the longitudinal direction of the batting part 2 becomes a recessed one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved baseball or softball bat (hereinafter referred to as "bat"). The present invention provides an excellent performance with a wide sweet area, in which the ball is able to fly far even when hit at a portion other than the sweet spot by forming the outer shape in the length direction of the bat hitting portion into a concave shape. Can be given.

[0002]

2. Description of the Related Art A bat tends to have a lower flat rigidity and a greater ball resilience performance as the diameter of a ball hitting portion is larger. Therefore, it is generally known that when designing a bat having excellent resilience performance, it is effective to increase the diameter of the hitting portion as much as possible.

[0003] On the other hand, if the diameter of the hitting portion of the bat is increased, the mass of the bat becomes heavy, making it difficult for the batter to swing,
When trying to increase the diameter and reduce the diameter, there is a problem that the strength is reduced.

Therefore, in the conventional bat, in order to improve the resilience performance, the length of the hitting portion has to be shortened in order to reduce the weight while increasing the diameter of the hitting portion. For this reason, there was a disadvantage that the sweet area became narrow.

As shown in FIG. 4, in the conventional bat, the external shape in the length direction of the hitting portion is formed to be a straight line or a gentle convex shape. Therefore, when the right batter hits the ball near the outer corner at the tip side of the hitting portion, the ball may become a first base side foul ball.

Contrary to the above, when the right batter hits the ball thrown toward the inner corner at the hand of the hitting portion, the ball sometimes becomes a third base side foul ball.

[0007]

Therefore, according to the present invention, even if a shot is made at a position slightly deviated from the sweet spot,
An object of the present invention is to realize a bat having a large sweet area, in which rebound performance does not decrease so much, and which can be expected to reduce foul balls.

[0008]

According to a first aspect of the present invention, the diameter of the sweet spot at the hitting portion is smaller than the diameter of the other portion of the hitting portion, and the outer shape of the hitting portion in the longitudinal direction is concave. A bat for baseball or softball, characterized in that it has a shape.

According to a second aspect of the present invention, there is provided a bat for a baseball or softball, wherein the concave outer shape of the hitting portion is a part of an arc or an ellipse.

[0010]

Embodiments of the present invention will be described below. The bat 1 of the present invention, as shown in FIG.
The diameter of the position of the sweet spot 3 of the hitting portion 2 where the hitting ball rebounds most is smaller than the diameter of the other portion of the hitting portion 2,
The external shape in the length direction of the hitting portion 2 is concave.

The concave outer shape has a minimum diameter at the position of the sweet spot 3 of the hitting portion 2, and the diameter gradually increases toward the tip 4 and the grip end 5 of the bat 1. Therefore, even when the ball is hit at a position other than the sweet spot 3, since the diameter of the hitting ball portion 2 is large, the bat 1 with a small reduction in resilience performance and a wide sweet area can be obtained.

The concave outline is desirably a part of a curve, in particular, an arc or an ellipse having a radius of curvature of 200 cm to 1000 cm, but may be formed as a straight line as shown in FIG.

The bat 1 is made of various materials such as wood, metal, and fiber reinforced plastic (FRP). However, the bat 1 of the present invention can be made of any material.

In the case of a wooden bat 1, it can be formed by forming the whole by turning and then reinforcing it with resin injection or the like.

In the case of a metal bat 1, it can be formed by first forming the bat 1 by a conventional manufacturing method and then using a metal roller or the like to make the hitting portion 2 concave.

In the case of the bat 1 made of FRP, for example, in the method of molding using a mold, the bat 1 can be formed by making the hitting portion 2 concave.

The whole bat 1 can be formed not only by the same material but also by combining different materials. For example, a combination of a hitting portion 2 of a metal bat 1 body and a concave FRP tubular member, a combination of a hitting portion 2 of a FRP bat 1 main body and a concave metal tubular member, or the like. is there.

[0018]

EXAMPLES Table 1 and FIG. 3 show the results of a comparative test of the resilience performance of the baseball bat 1 according to the present invention shown in FIG. 1 and the conventional baseball bat 1 shown in FIG. .

[0019]

[Table 1]

As is clear from the above results, the coefficient of restitution at the sweet spot 3 (around 680 mm from the grip end end) is the largest, and the further away from the sweet spot 3, the lower the coefficient of restitution. In the bat 1 of the conventional product, the decrease in the coefficient of restitution increases as the distance from the sweet spot 3 increases, but in the bat 1 of the present invention, the decrease in the coefficient of restitution decreases due to the increase in the diameter of the hitting portion. The area is large.

[0021]

According to the present invention, the diameter at the position of the sweet spot of the hitting ball portion is minimized, and the diameter is gradually increased from there toward the butt tip and the grip end.
Therefore, even when the ball is hit at a position other than the sweet spot, since the diameter of the hitting ball portion is large, the rebound performance is less reduced and a bat having a wide sweet area can be obtained.

Further, since the outer shape of the hitting portion in the length direction is concave, the ball hit at the end of the hitting portion can easily fly into the fair zone. The effect of shortening the time can also be expected.

[Brief description of the drawings]

FIG. 1 is a plan view of a bat according to the present invention.

FIG. 2 is a plan view of a bat according to another embodiment of the present invention.

FIG. 3 is a comparison test result of rebound performance between the bat according to the present invention and a conventional bat.

FIG. 4 is a plan view of a conventional bat.

[Explanation of symbols]

 1 Bat 2 Hitting part 3 Sweet spot 4 Tip 5 Grip end

Claims (3)

[Claims] 1. A sweet spot (3) of a hitting part (2)
A baseball or softball, characterized in that the diameter at the position is smaller than the diameter of the other part of the hitting part (2), and the outer shape in the longitudinal direction of the hitting part (2) is concave. Bat (1). 2. A concave outline of the hitting portion (2)
Baseball or softball bat (1) according to claim 1, characterized in that it is a curve. 3. The concave outline of the hitting portion (2) is as follows:
Baseball or softball bat (1) according to claim 2, characterized in that it is part of an arc or an ellipse.