JP3194502U - Bat structure for improved impact efficiency - Google Patents

Abstract

A bat structure capable of obtaining the maximum impact effect is provided. In a baseball bat comprising a bat head H, a bat body B, a bat throat part T, a bat grip part G, and a grip end, the bat body is determined by an additional weight ΔM (10 to 100 g) to the bat head H. The center of gravity of the bat in the part B is moved by Δa from the original position toward the bat hitting center, and the hand (bottom side) opposite to the dominant arm is determined by the inclination angle of the flare inclined part formed from the grip end to the grip part G with respect to the bat center line. It is characterized in that the gripped upper of the hand) is locked and the forearm of the bottom hand is guided to strike the impact while maintaining a right angle to the bat axis. [Selection] Figure 1

Description

Field to which the device belongs

  The present invention relates to a bat structure that facilitates obtaining the maximum hitting efficiency (the maximum kinetic energy of the hitting ball).

  Baseball is the most popular sport in Japan. However, physical and mechanical guidance is often not provided for striking, and the guidance is often the sensory guidance of the leader. In addition, as an improvement of many bat structures, there is an attempt to provide a bat that is light in weight and excellent in balance and striking properties (Patent Document 1), but there is no improvement in the structure that provides an excellent batting technique. .

  Then, once again, let us consider the dynamics of batting. As shown in FIG. 5, the bat has a body portion B having the thickest uniform diameter from the head H at the tip, and a grip in a range where the bat is gripped through a throat portion T whose diameter gradually decreases from the body portion B. There is a part G, and the bat generally ends at the grip end E (Non-patent Document 1). Then, considering that the bat hit is an elastic collision, the bat is gripped by the grip part G, swings out, swings at the maximum angular velocity ω, and the moment of inertia I and the angular velocity are moved to the center of gravity G away from the center Q of the grip. Batting means that kinetic energy F = Iω expressed by the product of ω is given, and the kinetic energy F given at the maximum angular velocity is hit at a sweet point near the hitting center P of the bat and transmitted to the ball. It can be said that it is a proposition. At the above sweet points, the maximum coefficient of restitution is V2 (speed of the bat swung to repel)-V0 (speed of the ball immediately after hitting) / V1 (speed of the ball thrown by Pichard)-V2 ( The rebound coefficient indicated by the speed of the bat swung to rebound is obtained. However, it is very difficult to acquire the feeling of striking.

JP 2005-27020 A

Bat Science (http://www.mitsuwa-tiger.com/batmuseum)

task to solve

Therefore, the present invention is based on the above-mentioned hitting proposition, and it is easy to perform bat swinging with the maximum angular velocity ω that the player can have, and a bat that can be hit at the sweet point of the bat while giving the maximum moment of inertia I to the bat center of gravity C. We worked hard to provide a structure.
First, in order to realize the bat swing of ω at the maximum angular velocity, an attempt is made to achieve by sensual guidance “shake the bat to hit the grip”. However, there is no theoretical explanation of why it is necessary to obtain the maximum angular velocity. Therefore, as a result of rigorous analysis of the sensory guidance of `` waving the bat as if it hits the grip '', the present inventor, as a result of swinging, swings the grip with the grip with the left back facing upward when swinging Accordingly, it was necessary to push the bat (FIG. 3B), and it was found that this was achieved by “shaking the bat to hit the grip”. Second, the bat swing with the maximum angular velocity gives an inertia moment around the center of gravity, and the product of the inertia moment I and the bat swing angular velocity ω is given to the ball as kinetic energy F, However, it is necessary to make an elastic collision with the ball at the sweet spot. Here, the sweet spot is a point between the node of the primary mode of the natural vibration of the bat and the hitting center, and a large coefficient of restitution is obtained (FIG. 5). The hitting center is the ball hitting the bat. This is a point where the translational motion of the center of gravity of the bat and the rotational motion around the center of gravity cancel each other out, and it means that it does not move. As a result of obtaining the most effective striking energy for striking at the sweet spot, it was found that the maximum striking effect was obtained.

Means to solve the problem

The present invention has been made on the basis of the above knowledge. In a baseball bat comprising a bat head H, a bat trunk B, a butt throat T, a butt grip G, and a grip end E,
The butt center of gravity C in the bat body B is moved from the original position toward the bat hitting center P by the additional weight ΔM to the butt head H, and the flare inclined portion formed from the grip end E to the grip portion G with respect to the bat center line. The bat structure is characterized by locking the back of the gripped hand of the hand (bottom hand) opposite to the dominant arm with an inclination angle α, and guiding it to hit impact.

  According to the present invention, the movement given to the hit ball at the sweet spot near the hitting center by moving the bat center of gravity C in the butt trunk B from the original position toward the bat hitting center P by the additional weight ΔM to the bat head H. The energy F can be maximized. Further, the flare inclined portion F formed from the grip end E to the grip G is guided by the inclination angle α with respect to the bat center line so that the gripped back of the hand opposite to the dominant arm faces upward and the impact is made. "Swing the bat to hit the grip" Realizes a swing that gives the bat swing the maximum angular velocity. The maximum hitting efficiency can be obtained by the above synergistic effect.

  In the present invention, it is easy to obtain a preferable butt swing by increasing the inclination angle α with respect to the center line of the flare portion by Δα according to the increased weight ΔM of the bat head.

The additional weight ΔM to the butted head is preferably in the range of 10 to 100 g although it depends on the total weight of the bat.

The perspective view of the bat structure concerning this invention. FIG. 2 is a cross-sectional view along the longitudinal axis of FIG. 1. The perspective view which shows the holding state of the grip part of FIG. FIG. 3B is a sectional view taken along line BB in FIG. 3A. FIG. 3A shows the body angle and the state of the left hand grip at the time of impact at the inner angle (1), middle (2), and outer angle (3) of the right batter by the grip of FIG. 3A. Explanatory drawing which shows the gravity center movement by the additional weight of the bat head in this invention. Conventional bat function explanatory drawing.

Preferred embodiment

Hereinafter, description will be given based on the accompanying drawings.
FIG. 1 is a side view of the entire bat, which includes a butt head H, a butt body B, a butt throat part T, a butt grip part G, and a grip end E.
The bat as a whole is made of wood, and the bat head H is attached with a cap-type head M having approximately 10 kinds of adjustment weights with an additional weight ranging from 10 to 100 g to a standard weight head. The end face of the bat head is circular, but the end face of the grip end has an oval or oval non-circular cross section.

  A predetermined weight ΔM is added to the butt head H. As a result, the center of gravity C of the bat in the bat body B moves from the original position in the direction of the bat hitting center P by Δa (see FIG. 4). On the other hand, since the hitting center P hardly moves, the sweet spot located near the hitting center from the center of gravity C hardly moves. Therefore, the kinetic energy F imparted to the center of gravity C increases by the distance Δa from the center Q of the grip by the amount of the center of gravity movement I (moment of inertia), so even if the angular velocity ω does not change, the kinetic energy is Δa × ω. Will increase. Moreover, as a result of the centroid C approaching the hitting center P, the kinetic energy acting on the centroid C is more likely to be affected by the sweet spot, and it is mechanically proved that the kinetic energy imparted to the ball at the sweet spot reliably increases.

  On the other hand, the body part B reaches the grip part G through the throat part T and has a non-circular cross-section, for example, an ellipse, extending toward the grip end E. α is formed. This non-circular flared portion F tilts the left hand grip of the right batter from the little finger side to the thumb side as shown in FIG. 3C. As a result, the left wrist is pressed and locked clockwise, and the left back is returned during the bat swing. As well as bending of the left elbow during impact. This induces the action of “shaking the bat so as to hit the grip”, resulting in an increase in the angular velocity of the bat swing. The inclination angle α with respect to the center line of the flare portion F is preferably increased by Δα according to the increased weight ΔM of the bat head. This is because as the center of gravity moves to the tip of the bat, an inertial force that makes the left back of the bat swing easier to return works.

In this way, the bat swings as the body rotates without returning the back of the right batter's left hand (bottom hand), and the left hand elbow is firmly stretched to maintain the bottom arm's forearm at right angles to the bat axis. When the impact occurs, an operation of “waving the bat to hit the grip” can be realized, and the maximum angular velocity of the batter in the swing can be obtained. Conventionally, it is suggested that the swing starts at an early stage to hit the in-course, hits the ball closer to the pitcher, delays the swing start and hits the ball to hit the out-course. Difficult because they are not the same. Using the bat of the structure of the present invention, the action of “swinging the bat so as to hit the grip” can be realized. As a result, the impact points are arranged in a line at any of the inner angle, the middle, and the outer angle (see FIG. 3C). Can be.

As described above, according to the present invention, the kinetic energy F at the sweet spot in the bat swing can be improved. Since the swing can be corrected so as to give the maximum angular velocity to the bat swing, the maximum impact efficiency can be achieved by the synergistic effect.

Claims (4)

In a baseball bat composed of a bat head H, a bat trunk B, a bat throat T, a bat grip G, and a grip end E,
The bat center of gravity C in the bat barrel B is moved by Δa in the direction of the bat hitting center P from the original position by the added weight ΔM to the butt head H, and the kinetic energy F applied to the center of gravity C is I (moment of inertia). The bat structure is characterized in that the kinetic energy is increased by Δa × ω, and the kinetic energy is increased by Δa × ω. 2. The bat structure according to claim 1, wherein the weight added to the bat top is in the range of 10 to 100 g. The cross section perpendicular to the bat axis formed from the grip end E to the center of the grip portion G has a flare inclined portion that gradually deforms from a non-circular shape to a circular shape, and the inclination angle of the outline of the flare inclined portion with respect to the bat center line 2. The second joint of the bottom hand is pressed in the thumb direction by α, the back of the hand is locked, and the forearm of the bottom hand is maintained at a right angle with respect to the bat axis to guide the impact to hit. The described bat structure. The bat structure according to claim 3, wherein the inclination angle α with respect to the center line of the flare portion F is increased by Δα according to the increased weight ΔM of the butt head H.

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