WO2016035782A1

WO2016035782A1 - Bat gripping structure and bat structure provided with same

Info

Publication number: WO2016035782A1
Application number: PCT/JP2015/074827
Authority: WO
Inventors: 豊治深江
Original assignee: 豊治深江
Priority date: 2014-09-02
Filing date: 2015-09-01
Publication date: 2016-03-10
Also published as: WO2016035815A1; US20170296891A1; US20170282031A1

Abstract

[Problem] To provide a bat gripping structure that guides a batter to a proper grip. [Solution] In order to achieve a grip that can achieve a swing "that stays inside the ball" along the bottom hand line at the top of a back swing during batting, the present invention provides a grip structure that is provided with a locking structure allowing the lower region (bottom grip) of a grip portion of a bat to gripped with the palm of the bottom hand and locks the grip of the palm of the bottom hand, thereby achieving a proper swing "that stays inside the ball" and improving the angular velocity of the bat swing. Moreover, provided is a bat structure for a bat with this grip structure such that an additional weight ΔM (10-100 g) is added to the bat head H of the bat so that the center of gravity C of the bat barrel B is moved by Δa from its original position toward the center of percussion P of the bat, thereby improving the hitting energy at the sweet spot and allowing an impact having the maximum hitting effect to be achieved.

Description

Bat grip structure and bat structure including the same

The present invention relates to a grip structure that induces an ideal grip for obtaining a maximum hitting effect on a batter, and a bat structure using the grip structure.

“The grip of a bat in baseball is an important grip that guides the correct bat swing. Usually, in the case of a right-handed player, the right joint of the finger of the right hand is held between the second joint of the finger of the left hand (bottom band) and the base of the finger. This is the most orthodox way of gripping, and the back of both hands is the correct way of gripping. With this grip, in the “top” of the takeback, a swing that matches the line from the shoulder of the bottom hand to the arm and the bat to the swing plane toward the ball, that is, three perpendicular relations between the arms and the bat. It is preferable that a swing that “creates a bat from the inside” is realized along the bottom hand line (Non-patent Document 1). In order to give both strength and control performance to the grip of such a bat, the bottom area of the grip part is gripped by the palm grip with the bottom hand, while the second joint of the finger is the second joint of the finger of the bottom hand It is recommended that the top hand be gripped with a finger grip so that it is between the fingers and the base of the finger.

Therefore, in the Giant patent (Patent Document 1), an inclination angle is provided between the grip portion having a substantially circular cross section and the knob-like grip end, and the short palm and the little finger abductor of the bottom grip are formed on the lower edge of the grip end. There is proposed a grip structure that forms a gently curved support surface that supports the wing and improves the grip strength during swing. On the other hand, in the Bruse patent (Patent Document 2), the grip part of the bottom hand has a non-circular cross section, and an asymmetric flare-shaped part is formed on the grip part at the upper part of the grip part of the non-circular cross section. It is intended to make a grip.

U.S. Patent No. 7744497 US Patent No. 7878930

However, in the former case, the grip part has a substantially circular cross section, and gently supports the short palm and the little finger abductor of the bottom grip on the slope between the grip part and the knob-shaped grip end and the lower edge of the grip end. Although it is intended to hold the bottom hand with a palm grip with a curved support surface, it is difficult to maintain it. On the other hand, the grip part of the bottom hand has a non-circular cross section like the latter, and the bottom area of the bottom hand is inclined in a flared shape from the end to the front of the bat. In addition to the circular shape, in order to incline the cross-sectional shape into a flare shape, the vertical distance with respect to the longitudinal center line of the bat becomes asymmetrical, and the method of manufacturing a bat by rotating a single log, There is a problem that manufacturing is extremely difficult.

Therefore, a first object of the present invention is to provide a grip structure that teaches and guides the downswing to the batter in a method that is relatively easy to manufacture. Furthermore, the second object of the present invention is to provide the above-mentioned grip structure, to realize a swing with high angular velocity along the bottom hand line, and to bring the center of gravity of the bat closer to the hitting center, An object of the present invention is to provide a bat structure in which the maximum striking effect can be obtained with a synergistic effect.

In the “top” of the takeback at the time of batting, the bat grip is placed between both arms and between each arm and the bat so that the line from the shoulder of the bottom hand to the arm and bat matches the swing plane toward the ball. In order to create a three right angle relationship and to swing out the bat from the inside along the bottom hand line by the three right angle relationship, first hold the palm grip on the bottom hand. It is necessary to provide a grip structure that maintains the forearm of the bottom hand and the bat axis in a right angle relationship, but in order to easily implement this grip structure, at least the grip end to the grip center in the bat grip. The cross section of the bottom grip perpendicular to the bat axis is approximately elliptical, and the elliptical grip is To manufacture a lock structure in which the bottom hand is pressed and swung toward the thumb centered on the wrist when gripped by the palm grip with the bottom hand, with the grip end tilted with respect to the axis of the bat grip, and to maintain the lock function Further, at least one side surface of the bottom end of the bottom grip and / or the palm end below the third joint of the little finger bulges outward, preferably both side surfaces bulge outward, so that the palm end does not come off from the grip end. We have found that it is preferable to use the Tafuku shape.

According to the present invention, the palm grip of the bottom hand is realized by the elliptical cross-sectional shape of the grip portion, and in the case of a right batter, the back of the hand of the bottom hand can be pressed clockwise by the lock structure and locked. In addition, the side of the grip end locking mechanism bulges outward to form a multi-fledged shape so that the bottom hand lock does not come off during swing, and the palm tip below the third finger joint of the palm grip hand The grip of the bottom hand is maintained at a right angle between the forearm and the axis of the bat. “As a result of realizing the correct swing, an operation of“ waving the bat so as to hit the grip ”is induced, resulting in an increase in the angular velocity of the bat swing.

US Pat. No. 7744497 Giant patent has an inclined angle between the grip part of the substantially circular cross section and the knob-shaped grip end, and supports the short palmar and little finger abductors of the bottom grip on the lower edge of the grip end A gently curved support surface is formed to improve the grip strength when swinging. In the present invention, the bottom hand grip portion has an elliptical cross section even without such a support surface, The slanted grip end provides a different and superior function in maintaining the palm grip when swinging. On the other hand, U.S. Pat. No. 7,787,930 uses a palm grip on the bottom hand by forming an asymmetric flare-shaped part on the upper part of the grip part having a non-circular cross section. The bat is difficult to manufacture because the distance from the center axis to the top and bottom is asymmetrical, but in the present invention, the axis of the grip part is aligned with the bat axis, and the bottom hand is locked by the locking mechanism of the inclined end surface of the grip end. To do. Moreover, the bottom hand can be easily detached from the grip end only by inclining the grip end in a flared shape only at the contact portion with the second joint of the little finger, but in the present invention, the non-circular cross section is manufactured. Select a relatively easy oval cross section, and eliminate the grip end by making the grip end and the side slightly bulge outward, so the bottom hand lock function is expanded and reinforced so that it does not come off during swing be able to.

In the present invention, not only the portion from the grip end to the grip center, but also the cross-section perpendicular to the bat axis with the grip portion of at least three fingers from the middle finger to the little finger of the top grip from the grip center to the bat head direction. By forming a generally oval shape, the palm of the top hand at least the middle finger, ring finger, and little finger area can be made a semi-palm grip with excellent controllability, and strong hitting can be achieved. The hitting of the ball gives a feeling similar to that of a baseball downswing.
Furthermore, when a palm grip is desired, the half circumference of the grip portion wrapped in the palm not only forms the lock mechanism at the top, but also forms a region that increases the friction coefficient of the grip at least in the center and the vicinity thereof. It is good. On the other hand, in the upper region of the grip part from the grip center to the throat part, a grip friction coefficient increasing part is formed so that the bottom hand grips the grip lower part with the palm grip and the grip upper part with the palm grip that can be controlled by the top hand It is good to make it easy to hold.

When this operation is considered mechanically with respect to batting, as shown in FIG. 10, the bat has a body portion B having the thickest uniform diameter from the head H at the tip, and a throat portion where the diameter gradually decreases from the body portion B. There is a grip portion G that is a range for gripping the bat via T, and the bat generally ends at the grip end E. 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 Gc of the grip. Batting is given by giving kinetic energy F = Iω expressed by the product of ω and hitting the kinetic energy F given by this maximum angular velocity at the sweet point near the hitting center P of the bat and transmitting it to the ball. It is a proposition. Therefore, the second of the present invention uses the grip structure described above, and based on the striking proposition, it is easy to perform bat swinging with the maximum angular velocity ω that the player can have, and while applying the maximum moment of inertia I to the bat center of gravity C, It also provides a bat structure that can be struck with sweet points.

That is, in order to realize bat swing of ω at the maximum angular velocity first, to form three right angles “take out the bat from the inside”, by using a grip structure that realizes at least the palm grip of the bottom hand , "Swing the bat to hit the grip" to achieve a swing. In order to sway the bat so that it hits the grip, a right batter needs a grip structure that locks the palm grip by gripping the grip with the left back facing upward when swinging. The operation is completed by pushing out the bat as the waist rotates (FIG. 13B). 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, The impact energy of the ball is elastically collided with the ball at the sweet spot. Here, the sweet spot is a point where a large coefficient of restitution is obtained (FIG. 10), and the hitting center is the translational motion of the bat's center of gravity when the ball hits the bat and the rotational motion around the center of gravity. A point that cancels and does not move, but when the center of gravity that gives impact energy to the ball is close to the center of impact, the result is that the most effective impact energy for hitting a sweet spot that gives a large coefficient of restitution As a result of hitting with the second maximum hit energy at the first maximum angular velocity, the maximum hitting effect is obtained.
Accordingly, a second aspect of the present invention is based on the above knowledge, and is 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. 4) A center-of-gravity position changing structure for moving the bat center of gravity C in the butt trunk B from the original position in the direction of the bat hitting center Pc by the additional weight ΔM to the butt head H and from the grip end to the butt throat T. The grip part G has a substantially oval shape suitable for a palm grip where the grip part is perpendicular to the bat axis and the palm is gripped. When the grip center Gc is moved to Gc1, the palm grip of the bottom hand is secured while hitting. The center Pc can be adjusted to Pc1, and 2) the grip end is perpendicular to the longitudinal axis of the bat It has a lock structure that tilts 20 to 30 degrees forward with respect to the surface and pivots by pressing the bottom hand toward the thumb centering on the wrist, and the grip end exceeds the generally elliptical cross section of the grip part G. Is widened to the side of the end inclined surface, and the outer bulge portion having a multi-shaped shape that engages with the tip of the little finger of the bottom hand and / or the palm part near the third joint of the little finger is formed, and the maximum obtained by the grip structure The bat structure has a function of transmitting the maximum moment Iω applied to the center of gravity obtained at the angular velocity ω to the hitting centers Pc to Pc1.

According to the present invention, the movement imparted 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. In addition to maximizing energy F, lock structure R formed from grip end E to grip G locks the gripped back of the hand on the opposite side of the dominant arm, and induces it to hit impact upward , "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. The additional weight ΔM to the bat head is preferably in the range of 10 to 100 g, although it depends on the total weight of the bat. Regardless of the grip position, at least the bottom hand is gripped with the palm grip, and the grip structure to obtain the maximum angular velocity and the center positions Gc and Gc1 at the grip that obtains the maximum angular velocity are changed, and the hit center A batting method suitable for each batter by changing the Pc and Pc1 and changing the center of gravity position to move the bat center of gravity C in the bat body B from the original position in the direction of the bat hitting center Pc by the additional weight ΔM to the bat head H The bat structure which can select is provided.

The grip structure of the present invention is preferably formed on a wooden bat, but can also be a general material that is not metal or any wood.

The portion that increases the friction coefficient of the bottom hand preferably surrounds the entire circumference of the lower half of the grip portion, but it is preferable to form at least the center portion of the grip portion and its vicinity from the grip center to the grip end. The length of the portion that increases the friction coefficient of the grip portion is made to match the rule regarding the length that can be applied to the pine sprout described in the rule book of the US Major League Baseball Committee.

The butt grip part G is 1) When the palm of the bottom hand is brought into contact with the grip end to the grip part G from the grip end to the butt throat part T, the grip part from the palm of the bottom hand to the middle finger of the upper hand is the bat. The cross section orthogonal to the axis forms a generally oval shape suitable for a palm grip that grips with a palm, and at least the grip part, above the bat, exceeds the middle finger of the upper grip, and at least the inclined part that changes from the non-circular cross section of the grip part to the circular cross section of the bat throat part A half-palm grip and finger grip that opens the little finger and thumb while maintaining the palm grip on the bottom hand even if the grip center Gc is moved to Gc1. And the center-of-gravity movement Δa and the hit center Pc to P It is possible batching adjustment commensurate with the batter in accordance with the movement of the 1 (see FIG. 14).

In the perspective view of the grip structure of the bat according to the present invention, the grip end having an elliptical cross section has a friction increasing portion at a portion in contact with the palm surface of the bottom hand, and the grip end end surface is a surface orthogonal to the longitudinal axis of the bat. It has an inclination of 20 to 30 degrees, and forms a lock structure at the boundary between the grip part and the grip end part. FIG. 2 is a perspective view showing a gripping state of the grip portion of FIG. 1, in which the lock structure includes a tip of a little finger and a third joint of the little finger that form a bulging portion that spreads outward along a grip end inclined surface and a palm tip below the tip. Shows a multi-shaped grip end that prevents it from coming off. The figure which shows the basic form with three right angles in the top from diagonally behind. The figure which shows the basic form with three right angles in the top from the back. FIG. 4 is a continuous explanatory view showing that the bat is pulled out without changing the distance between the bat and the shoulder and the right angle relationship between the bottom hand and the bat from the state of FIG. 3. In the first modification of the grip structure of the present invention, the boundary between the grip end having an elliptical section and the grip end of the bottom hand and the grip end of the inclined multifaceted shape contacting the tip of the little finger and the second joint of the little finger, and the grip end. Has a lock structure for locking the bottom hand. In a second modification of the grip structure of the present invention, the grip end having an elliptical cross section, the tip of the little finger, the little finger second joint, and the palm end below the little finger third joint are in contact with the slanted polymorphic grip end, the grip portion, and the grip end. It has a lock structure that locks the bottom hand at the boundary. In the third modification of the grip structure of the present invention, (A) shows the entire bat, and an inclined multi-shaped grip end contacting the tip of the little finger, the second joint of the little finger, and the palm end below the third joint of the little finger, and its end. A lock mechanism is formed at the boundary with the grip part, and the lower three-quarters of the grip part forms an elliptical cross section to form a grip for the palm grip, and from there to the slope part, a vertically long elliptical section The state which is changing into a circle is shown. (B) is a longitudinal sectional view thereof. FIG. 7 is an enlarged view (A) of the grip portion of the bat shown in FIG. 7, (B) is an end view thereof, and (C) is a sectional view taken along line AA, BB, CC, and DD of (A). . In the perspective view showing the grip state of the bottom hand and the top hand of the grip part of the third modification of the present invention, the bottom hand becomes a palm grip, but the top hand opens the thumb and forefinger, becomes a semi-palm grip, It shows the realization of strong grip for downswing and women's softball. In the perspective view of only the grip portion of the third modified example of the present invention, the grip end is inclined at 20, 25 and 30 degrees with respect to a perpendicular perpendicular to the butt axis, with the lower end portion substantially matching the grip outer shape. The upper end and the left and right ends show a state in which the grip end slightly bulges outward from the outer periphery of the elliptical grip section along the inclined surface. As a result, the grip upper end forms a bottom hand lock structure, and the left and right ends of the grip end form a structure that prevents the tip of the little finger and the palm end below the third joint of the little finger from slipping out of the grip end and keeps the bottom hand locked. To do. It is a conventional bat function explanatory drawing. It is the perspective view (A) of a bat structure concerning the present invention, and a longitudinal direction sectional view (B). It is a perspective view which shows the holding state of a grip part. FIG. 13B is a sectional view taken along line BB in FIG. 13A. The body angle and the state of the left hand grip at the time of impact of the inner angle (1), middle (2), and outer angle (3) of the right batter by the grip of FIG. 13A are shown. Explanatory drawing which shows the impact center movement accompanying the movement of the gravity center by the additional weight of the bat head and the movement of the grip center in the present invention.

(Preferred embodiment 1)
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 entire bat is made of wood and the end surface of the bat head is circular, but the end surface of the grip end has an oval bulging shape on both sides, followed by an elliptical cross section that passes the center of the grip and the throat It is formed so as to gradually change into a perfect circle.

When a predetermined weight ΔM is added to the butt head H, the bat center of gravity C in the bat barrel B moves by Δa from the original position in the direction of the bat hitting center P, so that the kinetic energy F applied to the center of gravity is Will increase.

On the other hand, the body part B reaches the grip part G through the throat part T, has a substantially oval cross section extending to the grip end E, and a bending angle α is formed on the outer grip surface with respect to the central axis extending in the longitudinal direction. A lock structure R is formed. This lock part R causes the left hand grip (bottom hand) of the right batter to cock from the little finger side to the thumb side, so that the left hand wrist is pressed clockwise as shown by the arrow in FIG. The right-angle relationship is maintained, and the return of the left back is prevented during bat swing, and the bending of the left elbow during impact is suppressed. In addition, the grip friction coefficient is increased at the half circumference of the grip portion wrapped in the palm of the bottom hand. On the other hand, in the upper region of the grip portion from the grip center to the throat portion, the friction coefficient of that region is set so that the second joint of the finger of the top hand comes between the second joint of the finger of the bottom hand and the base of the finger. If increased, the butt grip portion is gripped by the finger grip with the top hand (see FIG. 13A) and guided so that the back of the bottom hand and the back of the top hand are parallel. This is the “top” of the takeback when batting, so that the right angle relationship between the forearm of the second bottom hand and the forearm of the top hand matches the swing plane from the shoulder to the arm and the bat to the swing plane toward the ball. Creates three right-angle relationships between both arms and between each arm and the bat, and the three right-angle relationships provide a swing out the bat from within along the bottom hand line. Is.

Here, the three right angles are a right angle between the forearm of the bottom hand and the bat (FIG. 3A), and a second right angle between the forearm of the bottom hand and the forearm of the top hand (see FIG. 3A), the third is the right angle between the forearm of the top hand and the bat (FIG. 3B). In particular, the fact that the angle between the forearm of the bottom hand and the bat at the time of the top is almost a right angle has a very important meaning in the swing. As shown in FIGS. 4A to 4D, the bat is placed on the shoulder of the top hand. This is because the distance from the shoulder to the shoulder peak is not changed at all, and the almost right-angled grip is maintained, and it is pulled out only by the rotation operation in almost the state. This realizes that the “bat is taken out from inside”. On the other hand, if the angle between the bottom hand and the bat at the “top” becomes obtuse, that is, if the forearm and the bat of the bottom hand are at an obtuse angle at the “top”, the swing time from swing to impact is short. However, since the head is open to the catcher side from the beginning, the acceleration distance to the impact is not sufficient, the head speed at the time of impact does not increase, and the head is open from the beginning, so the head is fast in the outer sphere Return and cause a swing swing. Therefore, in order to maintain the relationship that the angle between the forearm of the bottom hand and the bat at the time of the top is almost a right angle, it is important to first grasp the grip lower area with the palm grip in the bottom hand.

Next, the right angle between the forearm of the bottom hand and the forearm of the top hand dominates the movement of both arms linked to the rotation of the upper body in the batting movement. Both arms do not move with the arms, but the movement of the scapula It moves by rotating the upper body. Therefore, if the forearms move from side to side at right angles from start to finish, the upper body moves when the swing starts to pull out the bat along the bottom hand line with the rotational movement without changing the close distance from the acetabulum to the acetabulum. (FIGS. 4B and C), creating a “pick bat from within” action. The right angle between the forearm of the bottom hand and the forearm of the top hand is a palm grip on the bottom hand, and the second joint of the finger of the top hand is between the second joint of the bottom hand and the base of the finger. If you grip the butt grip with the palm grip or finger grip with the top hand like a top hand, the back of the hand of the bottom hand and the back of the top hand will be parallel, swinging the line from the shoulder of the bottom hand to the arm and the bat toward the ball This will create a “pick bat from inside” action that matches the plane.

The grip structure of the bat is gradually deformed from an elliptical shape to a circular shape from the grip end toward the grip. In the case of the elliptical shape, the upper peripheral edge forms an inclined part, but the upper part of the grip end. Since it is flat from the periphery to the lower part, the little finger side and palm side of the bottom hand are slippery because the ends are not raised. Therefore, in the first modified example, the curved portion along the little finger is bulged in the middle part of the grip end to expand the lock mechanism, and the palm of the bottom hand is difficult to come off from the grip end. FIG. 5 shows this grip structure. FIG. 5A is an end view of the grip end. From the upper peripheral edge of the bottom hand side half to the middle abdomen, the peripheral edge bulges from the grip end toward the grip part to form a lock structure. The state is shown from the end view of FIG. 5A and the cross-sectional view taken along the line AA of FIG. 5C. In other words, the end view of FIG. 5A shows a state close to a multi-shaped oval cross-section, and the first curved portion is formed at the upper peripheral edge where the second joint portion of the bottom hand is clearly seen from comparison with the cross-sectional view of the following AA line. Then lock the wrist slightly clockwise. From the upper periphery to the middle abdominal periphery, an incline is formed from the end toward the grip, and the back of the bottom hand is locked clockwise from the little finger side to the thumb side. As a result, the little finger side of the bottom hand can be firmly gripped with the power grip without falling off from the grip end, and the forearm of the bottom hand is maintained at a right angle to the axis of the bat.

FIG. 6 is an improvement of the modified example shown in FIG. 5, and aims to prevent the power grip of the bottom hand from slipping out or coming off from the palm side grip end and to maintain the power grip of the bottom hand firmly. To do. That is, in the second modification, not only the upper part in the vicinity of the grip end, but also the palm end of the bottom hand is bulged along the edge of the middle abdomen along the curved edge along the little finger tip contact part and the third finger lower joint contact part. Not only is it difficult to come off the grip end, but it also prevents the little finger from coming out of the grip end and further improves the grip. FIG. 6 shows this grip structure. FIG. 6A is an end view of the grip end, and the upper peripheral edge to the middle abdomen peripheral edge on the bottom hand side half are curved from the end toward the grip to form a lock structure. The state is shown from an end view of FIG. 6A and a cross-sectional view taken along line AA of FIG. 6C. That is, the end view of FIG. 6A shows a state close to an elliptical cross section of a multi-shaped shape, and a first curved portion is formed at the upper peripheral edge where the second joint portion of the bottom hand is apparently compared with the cross-sectional view of the following AA line. Then lock the wrist slightly clockwise. In FIG. 6, not only the tip of the little finger from the upper edge but also the middle abdominal edge of the palm end below the third joint of the little finger, an inclined part is formed from the grip end toward the grip, and the back of the hand of the bottom hand turns clockwise from the little finger side to the thumb side. It is slightly lifted and locked. As a result, the palm side of the bottom hand can be firmly gripped with the power grip without falling off from the grip end, and the forearm of the bottom hand is maintained at a right angle to the axis of the bat.

As can be understood from the above description with reference to FIGS. 3A and 3B and FIGS. 4A to 4D, the bottom grip is gripped with the palm grip so that the angle between the forearm of the bottom hand and the bat at the top is almost perpendicular. This is the first necessary task, and second, the top hand between the second joint of the finger and the base of the finger against the palm grip of the bottom hand so that the forearm of the bottom hand and the forearm of the top hand are at right angles It can be seen that it is important to grip the butt grip portion with the palm grip or the finger grip with the top hand so that the second joint of the finger is placed. One of the present invention provides a grip structure that realizes such a grip. The first is a region that increases the coefficient of friction that realizes the palm grip of the bottom grip, and the second is a bottom grip and a bat. Is a grip structure that locks and grips at a right angle.

The grip structure shown in FIG. 7 to FIG. 9 is a bat grip in which at least the bottom grip extending from the grip end to the grip center is substantially elliptical in cross section perpendicular to the bat axis, and from the grip center of the top grip to above the bat. At least the grip part with three fingers from the middle finger to the little finger has a cross section orthogonal to the bat axis being substantially elliptical, and the region transitioning from the elliptical cross section to the circular cross section of the throat section is inclined. Has a region. First, the palm of the bottom hand is brought into contact with the grip end and the palm grip is gripped from the middle finger to the little finger of the top hand, giving a controllable palm grip, while the bottom hand is shifted toward the bat head. It has a butt grip structure that allows the palm grip to be gripped and the top hand to be shifted from the inclined part. By gripping the bottom hand and top hand with palm grip, it is easy to realize downswing, and it is possible to realize a grip suitable for girls' softball, while gripping the bottom grip with palm grip and finger on top hand It is also possible to select to grip, and the grip center can be moved from Gc to Gc1, and the strike center can be changed from Pc to Pc1 (FIG. 14).

The lock structure in this embodiment forms a lock structure by bending the upper end of the grip end along the finger pad so that the left and right ends from the upper end of the grip end and the tip of the little finger of the bottom hand are applied to the grip end. The little finger tip side of the end is slightly bulged, or the little finger tip side of the grip end and the palm peripheral end below the little finger are slightly bulged so that the little finger tip of the bottom hand and the palm tip below the little finger are on the grip end. For this reason, the grip end has a multi-faceted shape, each corner is inclined inward from the grip end, and the tip of the little finger and the palm end are reinforced so that they do not come off the grip end around the second joint of the bottom hand. . Note that the lower end of the grip end flows along the outer shape of the bat and does not need to bulge, but the end grip has an angle of 20 degrees, 25 degrees, and 30 degrees with respect to the vertical line (FIG. 10). The lock strength of the grip can be improved.

In addition, an area for increasing the friction coefficient of the grip is formed at least in the central part and the vicinity of the half circumference of the bottom grip part wrapped by the palm of the bottom hand, and the grip lower area (bottom) is formed by the palm grip on the bottom hand. Make it easier to grasp. For the top hand, an area that increases the friction coefficient of the grip is formed at least in the middle of and around the half circumference of the grip that is wrapped with the palm corresponding to the middle finger, ring finger, and little finger. (Bottom) can be made easier to grip.

(Preferred embodiment 2)
Hereinafter, description will be given based on the accompanying drawings.
FIG. 11 is a side view of the entire bat, which includes a butt head H, a butt trunk B, a butt throat T, a butt grip G, and a grip end E.
The bat as a whole is made of wood, and the bat head H is provided with a cap-type head M having approximately 10 kinds of adjustment weights with an additional weight varying 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 butt body B moves from the original position in the direction of the bat hitting center P by Δa (see FIG. 14). On the other hand, since the hit center P hardly moves, the sweet spot located near the hit 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 surely 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. Is formed. As shown in FIG. 3C, the lock portion R having an elliptical cross section tilts the left hand grip of the right batter from the little finger side to the thumb side. As a result, the left wrist is pressed clockwise to lock, and the left back is returned during 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 the more the center of gravity moves to the tip of the bat, the more the inertial force that makes the left back of the bat swing easier to return.

In this way, if you perform bat swing as the body rotates without returning the left batter of the right batter and impact by extending the left elbow firmly, you can realize the action of `` shaking the bat to hit the grip '', 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. When the bat having the structure of the present invention is used, the action of “waving the bat 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. 13C). Can be.

The grip part of the bat is gradually deformed into an elliptical shape and a circular shape from the grip end toward the grip center. In the case of an elliptical shape, the upper periphery forms an inclined part, but the grip end If the side of the upper hand is flat without any step on the side, the little finger side of the bottom hand is slippery because the end is not raised. Therefore, in the preferred embodiment 2, various grip structures shown in the preferred embodiment 1 may be employed. In particular, when the butt grip part G is 1) 'the grip part G from the grip end to the butt throat part T and the palm of the bottom hand is brought into contact with the grip end, the grip part from the palm of the bottom hand to the middle finger of the upper hand is The cross section perpendicular to the bat axis is substantially oval suitable for a palm grip gripped with a palm, and is changed from the elliptical cross section of the grip portion to the circular cross section of the bat throat portion in the upward direction of the bat beyond the middle finger of the upper grip. A two-stage grip formed by forming an inclined part,
The grip center Gc is moved to Gc1, the palm grip of the bottom hand can be secured, and the half palm grip and finger grip that release the little finger and thumb can be selected for the top hand grip, and the strike center Pc is adjusted to Pc1 It is preferable that it is possible, and 3) an area for increasing the friction coefficient of the grip is formed in at least the central part and the vicinity of the half circumference of the grip part wrapped by the palm of the hand of the bottom hand and the upper hand, and the palm It is preferable to enhance the grip.

As described above, according to the present invention, the kinetic energy F at the sweet spot in the bat swing is improved, and the swing is corrected so as to give the maximum angular velocity to the bat swing. The hitting efficiency can be achieved.

Claims

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,
1) When the grip part G from the grip end to the butt throat part T has a generally oval shape suitable for a palm grip in which the grip part grips with a palm in a cross section perpendicular to the butt axis line, and the grip center Gc is moved to Gc1, While securing the palm grip of the bottom hand, the hitting center Pc can be adjusted to Pc1, and 2) the grip end is inclined forward by 20 to 30 degrees with respect to the plane perpendicular to the longitudinal axis of the bat. It has a lock structure that pivots by pressing toward the thumb around the wrist, and the grip end extends to the side of the end inclined surface beyond the generally elliptical cross section of the grip G, and the tip of the little finger of the bottom hand And / or a butt grip structure characterized in that a multi-shaped outward bulging portion is formed which engages with a palm portion near the third finger joint. Made.
The butt grip part G is 1) 'When the palm of the bottom hand is brought into contact with the grip end of the grip part G from the grip end to the butt throat part T, the grip part from the bottom hand palm to the middle finger of the upper hand is the bat axis An inclined part that is substantially oval suitable for a palm grip in which the cross section perpendicular to the palm is gripped by a palm and changes from the elliptical cross section of the grip part to the circular cross section of the bat throat part at least in the upward direction of the bat beyond the middle finger of the upper grip A two-stage grip formed by forming
The grip center Gc is moved to Gc1, the palm grip of the bottom hand can be secured, and the half palm grip and finger grip that release the little finger and thumb can be selected for the top hand grip, and the strike center Pc is adjusted to Pc1 2. The bat grip structure according to claim 1, which is possible.
3. The palm grip is strengthened by forming an area for increasing the friction coefficient of the grip 3) at least in the central portion and in the vicinity of the half periphery of the grip portion wrapped by the palm of the hand of the bottom hand and the upper hand. The butt grip structure as described in.
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,
4) A grip portion extending from the grip end to the butt throat portion T is provided with a center of gravity position changing structure for moving the bat center of gravity C in the bat barrel portion B from the original position toward the bat hitting center Pc by the additional weight ΔM to the bat head H If the cross section perpendicular to the butt axis of G has a substantially oval shape suitable for a palm grip in which the grip is gripped with a palm, and the grip center Gc is moved to Gc1, the hitting center Pc is secured while securing the palm grip of the bottom hand. 2) The grip end is tilted forward by 20 to 30 degrees with respect to the plane perpendicular to the longitudinal axis of the bat, and the bottom hand is pivoted by pressing the bottom hand toward the thumb around the wrist. It has a lock structure, and the grip end extends beyond the generally elliptical cross section of the grip portion G, and the end of the end inclined surface And a bulge-shaped outward bulge that engages with the tip of the little finger of the bottom hand and / or the palm near the third joint of the little finger is formed, and the center of gravity obtained at the maximum angular velocity ω obtained by the grip structure is formed. A bat structure having a function of transmitting the maximum moment Iω to the hitting centers Pc to Pc1.
The butt grip part G is 1) 'When the palm of the bottom hand is brought into contact with the grip end of the grip part G from the grip end to the butt throat part T, the grip part from the bottom hand palm to the middle finger of the upper hand is the bat axis An inclined part that is substantially oval suitable for a palm grip in which the cross section perpendicular to the palm is gripped by a palm and changes from the elliptical cross section of the grip part to the circular cross section of the bat throat part at least in the upward direction of the bat beyond the middle finger of the upper grip A two-stage grip formed by forming
The grip center Gc is moved to Gc1, the palm grip of the bottom hand can be secured, and the half palm grip and finger grip that release the little finger and thumb can be selected for the top hand grip, and the strike center Pc is adjusted to Pc1 2. The bat grip structure according to claim 1, which is possible.
6. The palm grip is strengthened by forming an area for increasing the friction coefficient of the grip 3) at least in the central portion and in the vicinity of the half periphery of the grip portion wrapped by the palm of the hand of the bottom hand and the upper hand. The bat structure as described in.