JP6734779B2 - Bat grip structure and bat structure including the same - Google Patents

Description

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

The bat grip in baseball is an important grip that guides the correct bat swing. Normally, in the case of a right-handed athlete, the second 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 backs of both hands are parallel. With this grip, at the "back" of the takeback, the swing that matches the line from the shoulder of the bottom hand to the arm and the bat with the swing plane toward the ball, that is, the three right angle relationships between the arms and the bat. It is better to create and swing along the line of the bottom hand to “put out the bat from inside” (Non-Patent Document 1). In order to have both strength and control performance for gripping such a bat, the lower part of the grip part is grasped by the palm grip with the bottom hand, while the second joint of the top hand is the second joint of the bottom hand. It is recommended that the top hand be held with a finger grip so that it is between the base of the finger 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-shaped grip end, and the palm of the bottom grip and the little finger abductor muscle are provided at the lower edge of the grip end. There is proposed a grip structure that forms a gently curved support surface for supporting a vehicle and improves 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 the asymmetrical flare shape part is formed on the grip part of the non-circular cross section to form a palm on the bottom hand. It tries to make a grip.

U.S. Pat.No. 7744497 U.S. Pat.No. 7788930

"Batting Mechanism Book" by Ken Maeda, published by Baseball Magazine (Theory)

However, in the former case, the grip portion has a substantially circular cross section, and the inclination between the grip portion and the knob-shaped grip end and the lower edge of the grip end gently support the short palm muscle and little finger abductor muscle of the bottom grip. Although it is intended to allow the palm hand to grip the bottom hand with the curved support surface, it is difficult to maintain it. On the other hand, like the latter, the grip part of the bottom hand has a non-circular cross section, and by flaring the lower region of the bottom hand from the end to the front of the bat in a flare shape, it is suitable for a palm grip, but the grip part has a non-cross section shape. Not only in the circular shape, the vertical distance is asymmetric with respect to the longitudinal centerline of the bat in order to incline the cross-sectional shape into a flare shape, and in the method of manufacturing a bat by rotating a single log, The problem is that it is extremely difficult to manufacture.

Therefore, it is a first object of the present invention to provide a grip structure that teaches and guides a downswing to a batter in a method that is relatively easy to manufacture. Further, a second object of the present invention is to provide the above-mentioned grip structure, realize a swing with a high angular velocity of "putting out the bat from the inside" along the line of the bottom hand, and bring the center of gravity of the bat closer to the center of impact, The object of the present invention is to provide a bat structure in which the maximum impact effect is obtained by the synergistic effect of.

At the "top" of the takeback at the time of batting, the butt grip is used between the arms and between the arms and the bat so that the line from the shoulder to the arm to the bat of the bottom hand matches the swing plane toward the ball. In order to realize the swing of "putting the bat out from the inside" along the line of the bottom hand by making the three right-angled relations with each other, first, the palm grip is held on the bottom hand. Therefore, it is necessary to provide a grip structure that maintains the forearm of the bottom hand and the butt axis at a right angle relationship.However, in order to easily implement this grip structure, in the butt grip, at least from the grip end to the grip center. A cross-section of the bottom grip orthogonal to the bat axis is roughly elliptical, and when the elliptical grip part is gripped by a palm grip with a bottom hand, a lock structure is provided that pushes and swivels the bottom hand around the wrist part toward the thumb side. The grip end is manufactured by inclining with respect to the axis of the butt grip, and in order to maintain its locking function, the tip of the little finger of the bottom grip and/or the palm end below the third joint of the little finger should not come off from the grip end. It has been found that it is preferable that the grip end has an Otafuku shape in which at least one side surface bulges outward, and preferably both side surfaces bulge outward.

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-handed batter, the back structure of the bottom hand can be pressed clockwise to be locked by the lock structure. In addition, the side surface near the grip mechanism of the grip end is bulged outward so that the bottom hand does not come out of lock even during swinging, making it a polymorphic shape, the tip of the little finger of the palm grip or the palm end below the third joint of the little finger. The grip of the bottom part is eliminated and the palm grip of the bottom hand is maintained while swinging, so the grip of the bottom hand is maintained at a right angle relationship between the forearm and the bat axis, and ``put out the bat from inside'' As a result of realizing the correct swing, the action of “shaking the bat so as to hit the grip” is induced, and the result is that the angular velocity of the bat swing is improved.

U.S. Pat.No. 7744497 Giant patent has a tilt angle between a grip part with a substantially circular cross section and a knob-shaped grip end, and supports the short palmar muscles and little finger abductor muscles of the bottom grip at the lower edge of the grip end. The grip portion of the bottom hand has an elliptical cross-section even if such a supporting surface is not provided in the present invention. It has a different function in maintaining the palm grip when swinging at the inclined grip end of. On the other hand, U.S. Pat.No. 7,788,930, the Bruse patent, intends to allow the bottom hand to perform a palm grip by forming an asymmetric flare shape portion on the grip portion having a non-circular cross section. It is difficult to manufacture the bat because the vertical distance from the central axis of the butt is asymmetric, but in the present invention, the bottom hand is locked by the locking mechanism of the inclined end surface of the grip end by aligning the axis of the grip part with the butt axis. To do. Moreover, the bottom hand is likely to come off from the grip end only by inclining the grip end forward in a flare 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 elliptical cross section, and eliminate it by making the grip end a voluminous shape and slightly bulging the side outward, so that the locking function of the bottom hand expands and it is reinforced so that it does not come off during swing. be able to.

Further, in the present invention, not only the part from the grip end to the center of the grip, but also the grip part with three fingers of at least the middle finger to the little finger of the top grip in the bat head direction from the grip center is a cross section orthogonal to the bat axis. Since it has an almost elliptical shape, not only the bottom hand but also the palm of at least the middle finger, ring finger and little finger of the top hand can be made into a semi-palm grip with excellent controllability, and it is possible to hit strongly, so it is particularly soft. Hitting the ball gives a pleasant, baseball down-swing-like feel.
Further, when a palm grip is desired, the half-periphery of the grip portion to be wrapped in the palm not only forms the above locking mechanism, but also forms an area portion that increases the friction coefficient of the grip at least in the central portion and in the vicinity thereof. It's good. On the other hand, in the upper part of the grip part from the grip center to the throat part, a grip friction coefficient increasing part is formed to allow the bottom hand to grip the lower part of the grip with the palm hand and the top hand to control the upper part of the grip. It is better to make it easier to grasp.

When this operation is considered mechanically in terms of 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 the throat portion whose 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. Considering that the bat impact is an elastic collision, the bat is grasped by the grip portion G, swung out, and swung with the maximum angular velocity ω, and the inertial moment I and the angular velocity are applied to the center of gravity G at a distance a from the center Gc of the grasp. Batting is that kinetic energy F=Iω represented by the product of ω is given, and the kinetic energy F given at the maximum angular velocity is struck at a sweet point near the hitting center P of the bat and transmitted to the ball. It is a proposition. Therefore, the second aspect of the present invention is to use the above-mentioned grip structure, to easily perform bat swing with the maximum angular velocity ω that the player can hold based on the above-mentioned batting proposition, and to give the maximum inertia moment I to the center of gravity C of the bat while It also provides a bat structure that can be hit at the sweet point.

That is, firstly, in order to achieve the ω swing at ω at the maximum angular velocity, three right angles are formed to “take out the bat from the inside”. Therefore, by using the grip structure that realizes at least the palm grip of the bottom hand, Achieve the "swing the bat like a grip" swing. In order to "swing the bat like hitting a grip", a right batter needs a grip structure that grips the palm with the left instep facing upwards and swings the palm grip when swinging. This is completed by performing an operation of pushing out the bat as the hip rotates below (FIG. 13B). Secondly, the bat swing having the maximum angular velocity gives a moment of inertia about the center of gravity, and the product of this moment of inertia I and the bat swing angular velocity ω is given to the ball as kinetic energy F, However, the ball hits the ball with an elastic collision at the sweet spot. Here, the sweet spot is a point at which a large coefficient of restitution is obtained (Fig. 10), and the batting center is defined by the translational movement of the center of gravity of the bat when the ball hits the bat and the rotational movement around the center of gravity. It is a point that they do not move because they cancel each other, but when the center of gravity that gives the hitting energy to the ball and the hit center are brought close to each other, the most effective hitting energy is obtained for hitting at the sweet spot where a large coefficient of restitution is obtained As a result of striking with the first maximum angular velocity and the second maximum striking energy, the maximum striking effect is obtained.
Therefore, the second aspect of the present invention is based on the above knowledge, and is a baseball bat including a bat head H, a bat body B, a bat throat part T, a butt grip part G, and a grip end E. In 4), a structure for changing the position of the center of gravity for moving the center of gravity C of the bat on the bat body B from the original position to the center of the bat striking Pc by the added weight ΔM to the bat head H is provided, and from the grip end to the butt throat part T The grip portion G has a cross section of the grip portion orthogonal to the bat axis line and has a substantially elliptical shape suitable for a palm grip which is gripped by the palm. When the grip center Gc is moved to Gc1, the palm grip of the bottom hand is secured while striking. The 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 orthogonal to the longitudinal axis of the bat, and the bottom hand is pressed toward the thumb side around the wrist. It has a lock structure that turns, and the grip end spreads laterally beyond the generally elliptical cross section of the grip part G, and the palm near the tip of the little finger of the bottom hand and/or the third joint of the little finger. An outwardly bulging portion having an oval shape that is engaged with the portion is formed and has a function of transmitting the maximum moment Iω applied to the center of gravity obtained at the maximum angular velocity ω obtained by the grip structure to the striking centers Pc to Pc1. It has a characteristic bat structure.

According to the present invention, the weight given to the bat head H ΔM moves the bat center of gravity C on the bat body B from the original position in the direction of the bat striking center P, thereby giving a motion to the striking ball at the sweet spot near the striking center. While maximizing the energy F, the locking structure R formed from the grip end E to the grip G locks the gripped instep of the hand on the side opposite to the dominant arm, and guides the hitting impact upwards. , "Shake the bat to hit the grip" Realize the swing that gives the bat swing maximum angular velocity. The maximum impact efficiency can be obtained by the synergistic effect. The added weight ΔM to the bat head depends on the total weight of the bat, but is preferably in the range of 10 to 100 g. Also, regardless of the grip position, at least the bottom hand is gripped with a palm grip to obtain the maximum angular velocity, and the center position Gc and Gc1 of the grip that obtains the maximum angular velocity are changed to change the center of impact. While changing between Pc and Pc1, the batting method suitable for each batter by changing the position of the center of gravity that moves the bat center of gravity C on the bat body B from the original position to the bat striking center Pc direction by the added weight ΔM to the bat head H. It provides a bat structure that can be selected.

The grip structure of the present invention is preferably formed into a wooden bat, but can also be metal or any non-wooden common material.

The portion for increasing the friction coefficient of the bottom hand preferably surrounds a half circumference of the entire lower half of the grip portion, but at least the central portion of the grip portion and its vicinity are preferably formed from the grip center to the grip end. The length of the part that increases the coefficient of friction of the grip part matches the rule regarding the length to which pine tar can be applied, which is described in the rule book of the United States Major League Baseball Committee.

Also, when the palm of the bottom hand is brought into contact with the grip end from the grip end G from 1) 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 grip part G. A cross section orthogonal to the axis is of a substantially elliptical shape suitable for a palm grip that grips with the palm, and an inclined portion that changes above the bat beyond the middle finger of the upper grip to at least the non-circular cross section of the grip section to a circular cross section of the bat throat section. With a two-step grip formed by forming a semi-palm grip and a finger grip, the top hand grip opens the little finger and thumb while securing the palm grip on the bottom hand even if the grip center Gc is moved to Gc1. Can be selected, and with the movement of the center of gravity Δa and the movement of the batting center from Pc to Pc1, batching adjustment suitable for each batter can be performed (see FIG. 14).

FIG. 3 is a perspective view of a grip structure of a bat according to the present invention, which has a friction increasing portion at a portion of the grip portion having an elliptical cross section 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 portion and the grip end portion. FIG. 2 is a perspective view showing a gripping state of the grip portion of FIG. 1, and the lock structure is formed on the tip end of the little finger and the third joint of the little finger that form a bulge portion that spreads outward along the inclined surface of the grip end, and the palm end below the joint. It shows a gripped end with a fortune shape that prevents it from coming off. The figure which shows the basic form with three right angles in the top from diagonally behind. Back view of the basic shape with three right angles at the top. FIG. 4 is a continuous explanatory view showing that the bat is pulled out from the state of FIG. 3 without changing the distance between the bat and the shoulder and the perpendicular relationship between the bottom hand and the bat. In the first modified example of the grip structure of the present invention, the grip end having an elliptical cross section and the grip end of the bottom hand that contacts the tip of the little finger and the second little finger joint, and the boundary between the grip end and the grip portion and the grip end. It has a lock structure that locks the bottom hand. In a second modified example of the grip structure of the present invention, a grip end having an elliptical cross section, a little finger tip, a second little finger joint, and a palm end below the third little finger joint are formed in a tilted shape, a grip end, a grip portion, and a grip end. It has a lock structure that locks the bottom hand at the boundary with. In the third modified example of the grip structure of the present invention, (A) shows the entire bat, and a grip end having a slanting Otafuku shape 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-fourths of the grip part forms an elliptical cross section, forming a grip for a palm grip, and from there to a sloped elliptical cross section. It shows a state of being transformed into a circle. (B) is a longitudinal sectional view thereof. 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 part and the top hand of the grip portion of the third modified example of the present invention, the bottom hand is a palm grip, but the top hand is a half palm grip with the thumb and forefinger open. It shows that a strong grip for down swing and women's softball is realized. In a perspective view of only the grip portion of the third modified example of the present invention, the lower end portion of the grip end substantially conforms to the outer shape of the grip, and is inclined by 20, 25, and 30 degrees with respect to a perpendicular line perpendicular to the butt axis line, The upper end and the left and right ends show a state in which the grip end is slightly bulged outward from the outer circumference of the grip part having an elliptical cross section along the inclined surface. As a result, the upper end of the grip forms a lock structure for the bottom hand, and the left and right ends of the grip end prevent the tip of the little finger and palm end below the third joint of the little finger from slipping out of the grip end, and maintain the lock of the bottom hand. To do. It is a conventional bat function explanatory drawing. It is a perspective view (A) and a longitudinal direction sectional view (B) of a bat structure concerning the present invention. It is a perspective view showing a grasping state of a grip part. 13B is a sectional view taken along line BB of FIG. 13A. FIG. 13A shows the body angle and the left hand grip state of the right batter at the time of impact of the inside angle (1), the middle (2), and the outside angle (3) by the grip of FIG. 13A. FIG. 5 is an explanatory view showing the movement of the center of gravity due to the additional weight of the bat head and the movement of the hitting center accompanying the movement of the grip center in the present invention.

(Preferred Embodiment 1)
Hereinafter, description will be given with reference to the accompanying drawings.
FIG. 1 is a side view of the entire bat, which includes a bat head H, a bat body portion B, a bat throat portion T, a butt grip portion G, and a grip end E.
The entire bat is made of wood, and the end face of the bat head is circular, but the grip end end face has an elliptical shape that bulges out on both sides, and then the grip part has an elliptical cross section that passes past the grip center and the throat part. It is formed so as to gradually change into a perfect circle.

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

On the other hand, the body portion B reaches the grip portion G through the throat portion T, has a substantially elliptical cross section toward the grip end E, and a bending angle α is formed on the grip surface outside the central axis extending in the longitudinal direction. A lock structure R is formed. As a result of the right hand batter's left hand grip (bottom hand) being cocked from the little finger side to the thumb side, this lock part R pushes and locks the left wrist in the clockwise direction as shown by the arrow in FIG. Maintains the right-angle relationship between the two and suppresses the return of the back of the left hand during bat swing, and suppresses the flexion of the left elbow during impact. In addition, the grip friction coefficient is increased at the half circumference of the grip portion that is wrapped by the palm of the bottom hand. On the other hand, in the upper region of the grip portion from the center of the grip to the throat portion, the friction coefficient of the region is adjusted 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 it increases, the butt grip is gripped by the top hand with the finger grip (see FIG. 13A), and the back hand of the bottom hand and the back of the top hand are guided so as to be parallel to each other. This is because in the "top" of the takeback during batting, the right-angled relationship between the second forearm of the bottom hand and the forearm of the top hand matches the line from the shoulder to the arm to the bat with the swing plane toward the ball. Creates three right-angled relationships between both arms, and between each arm and the bat, and the three right-angled relationships achieve the "out of the bat" swing along the bottom hand line. It is a thing.

Here, the three right angles are the right angle between the forearm of the bottom hand and the bat (Fig. 3A), and the second right angle between the forearm of the bottom hand and the forearm of the top hand (Fig. 3A). 3A), the third is the right angle between the forearm and bat of the top hand (Fig. 3B). In particular, the fact that the angle between the forearm of the bottom hand and the bat at the time of top is almost right is very important in the swing, and as shown in FIGS. 4A to 4D, the bat is placed on the shoulder (acromial) of the top hand. This is because the distance from the acromion does not change at all from a close distance, and the grip can be pulled out only by rotating in almost any state while maintaining the grip at a right angle. This realizes "putting out the bat from the inside". On the other hand, if the angle between the bottom hand and the bat becomes obtuse at "Top", that is, if the forearm and bat of the bottom hand at "Top" are obtuse, the swing time from swing-out to impact becomes short. However, since the head is open to the catcher side from the beginning, the acceleration distance to the impact cannot be taken sufficiently, the head speed at the time of impact can not be increased, and the head is open from the beginning, so the head is fast in the outer sphere. It will return and cause hooking 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 substantially right, it is important to first grasp the grip lower region with the palm grip with the bottom hand.

Next, the right angle between the forearm of the bottom hand and the forearm of the top hand governs the movement of both arms that interlocks with the rotation of the upper body in the batting motion, and both arms do not move with the arms, but the movement of the scapula. It is the one that moves with the rotation of the upper body. Therefore, if the forearms move from right to left at right angles, the upper body moves at the start of swing when the swing starts, pulling out the bat along the line of the bottom hand in a state where the distance from the acromion to the acromion does not change. Neighbors (FIGS. 4B and C), creating an “out of bat” action. This right angle between the forearm of the bottom hand and the forearm of the top hand realizes palm grip in the bottom hand, and the second joint of the top hand finger is placed between the second joint of the bottom hand and the base of the finger. If you grip the butt grip part with a palm grip or finger grip with the top hand as if you were hitting, the back of the bottom hand will be parallel to the back of the top hand, and the line from the shoulder of the bottom hand to the arm and bat will swing toward the ball. It will create a "bat out" action that matches the plane.

The grip structure of the bat is designed to gradually deform from an elliptical shape to a circular shape from the grip end toward the grip. In the case of an elliptical shape, the upper peripheral edge forms an inclined portion, 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 abdomen of the grip end, the lock mechanism is enlarged, and the palm of the bottom hand is unlikely to fall out of the grip end. FIG. 5 shows this grip structure. FIG. 5A is an end view of the grip end, and the lock structure is formed by bulging from the grip end to the grip part from the upper peripheral edge to the middle abdominal peripheral edge of the half circumference on the bottom hand side. The state is shown from the end view of FIG. 5A and the sectional view along the line AA of FIG. 5C. That is, in the end view of FIG. 5A, a state close to the elliptical cross section of the Otofuku shape is shown, and it is clear from a comparison with the following cross-sectional view taken along the line AA that the first curved portion is formed on the upper peripheral edge where the second joint of the bottom hand is applied. Then, the wrist is slightly rotated clockwise and locked. The upper peripheral edge and the middle abdominal peripheral edge are exposed outward, and an inclined portion 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 by 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 line of the bat.

FIG. 6 is an improvement of the modified example shown in FIG. 5, and is intended to prevent the power gripped bottom hand from slipping out or coming off from the palm-side grip end, and to firmly maintain the power grip of the bottom hand. To do. That is, in the second modified example, not only the upper part near the grip end, but also the palm end of the bottom hand is expanded by bulging the curved part along the tip of the little finger and the third palm of the little finger at the periphery of the middle abdomen. Not only does it become hard to slip off from the grip end, but it also prevents the little finger from slipping off from the grip end, further improving grip power. FIG. 6 shows this grip structure. FIG. 6A is an end view of the grip end, and a lock structure portion is formed by curving from the upper end to the middle abdomen periphery of the half circumference on the bottom hand side toward the grip. The state is shown from the end view of FIG. 6A and the sectional view along the line AA of FIG. 6C. That is, in the end view of FIG. 6A, a state close to the elliptical cross section of the Otofuku shape is shown, and it is clear from a comparison with the following cross-sectional view taken along the line AA that the first curved portion is formed on the upper peripheral edge where the second joint of the bottom hand is applied. Then, the wrist is slightly rotated clockwise and locked. In Fig. 6, not only the tip of the upper finger but also the tip of the little finger as well as the middle abdominal edge of the palm end below the third joint of the little finger is formed with an inclined portion from the grip end to the grip, and the back 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 by 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 bat axis.

As described above with reference to FIGS. 3A and 3B and FIGS. 4A to 4D, the bottom grip is gripped by the palm grip so that the angle between the forearm and the bat of the bottom hand at the time of top is substantially right angle. The first issue is that, secondly, the top hand is placed 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 a right angle. It is important to grasp the butt grip with the palm grip or finger grip with the top hand so that the second joint of the finger comes. One of the present inventions provides a grip structure that realizes such a grip, the first is an area portion that increases the coefficient of friction that realizes a palm grip of a bottom grip, and secondly, a bottom grip and a bat. It is a grip structure that locks and grips at a right angle.

In the butt grip, the grip structure shown in FIGS. 7 to 9 is such that at least the bottom grip from the grip end to the grip center has a substantially elliptical cross section orthogonal to the bat axis, and the top grip is located above the bat. The cross section of at least the three fingers from the middle finger to the little finger, which is orthogonal to the bat axis, has a substantially elliptical shape, and the region from which there is a transition to the throat section is an inclination from the elliptical section to a circular section of the throat section. Has an area. This is because first of all, the palm of the bottom hand is brought into contact with the grip end to hold the palm grip, while on the other hand, the middle hand to the little finger of the top hand is gripped for a controllable palm grip, while the bottom hand is displaced toward the bat head. It has a butt grip structure that makes the palm grip and shifts the top hand from the inclined part. By gripping the bottom hand and top hand with palm grip, down swing can be easily realized, and a grip suitable for women's softball can be realized, and the bottom grip is gripped with palm grip, and the top hand has fingers. It is also possible to select gripping, move the grip center from Gc to Gc1, and change the striking center from Pc to Pc1 (FIG. 14).

In the lock structure in this embodiment, the upper end of the grip end is curved so as to follow the finger pad to form a lock structure, and the left and right ends from the upper end of the grip end are gripped so that the tip of the little finger of the bottom hand touches the grip end. The little finger tip side of the end is slightly swollen, or the little finger tip side of the grip end and the palm peripheral edge below the little finger are slightly swollen so that the little finger tip of the bottom hand and the palm end below the little finger touch the grip end. Therefore, the grip end has an oval shape, each corner is inclined inward from the grip end, and the little finger tip side and palm end side are reinforced so as not to come off from the grip end centering on the second joint of the bottom hand. .. The bottom end of the grip end does not have to bulge and flow along the contour of the bat, but the end grip has an angle of 20 degrees, 25 degrees, or 30 degrees with respect to the vertical line (Fig. 10). The lock strength of the grip can be improved.

Further, an area portion for increasing the friction coefficient of the grip is formed at least in the central portion of the semicircular portion of the bottom grip portion wrapped in the palm of the bottom hand and in the vicinity thereof, and the palm grip lower area (bottom) is formed on the bottom hand with the palm grip. Make it easier to hold. About the top hand An area that increases the friction coefficient of the grip is formed at least in the center of the half circumference of the grip that is wrapped by the palms equivalent to the middle finger, the ring finger, and the little finger, and in the vicinity of the grip. It is also possible to make it easier to hold (bottom).

(Preferred Embodiment 2)
Hereinafter, description will be given with reference to the accompanying drawings.
FIG. 11 is a side view of the entire bat, which includes a bat head H, a bat body portion B, a bat throat portion T, a butt grip portion G, and a grip end E.
The entire bat is made of wood, and the bat head H is provided with cap-type heads M of about 10 kinds of adjustable weights whose standard weight heads and added weights vary in the range of 10 to 100 g. The end surface of the butt head is circular, but the end surface of the grip end has an elliptical or oval non-circular cross section.

A predetermined weight ΔM is added to the bat head H. As a result, the center of gravity C of the bat on the bat body B moves from the original position in the direction of the bat striking center P by Δa (see FIG. 14). On the other hand, the batting center P hardly moves, so that the sweet spot located near the batting center from the center of gravity C hardly moves. Therefore, the kinetic energy F given to the center of gravity C increases by the distance Δa from the center Q of the grip by the amount of movement of the center of gravity I (inertia moment), so even if the angular velocity ω does not change, the kinetic energy is Δa×ω min. Will increase. Moreover, as a result of the center of gravity C approaching the hitting center P, the kinetic energy acting on the center of gravity C is more likely to be influenced 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 portion B reaches the grip portion G via the throat portion T, has a non-circular cross section toward the grip end E, for example, an elliptical shape, and has an inclination angle α on the grip surface outside the central axis extending in the longitudinal direction. Is formed. As shown in FIG. 3C, the lock portion R of this elliptical cross section tilts the left-hand grip of the right-handed batter from the little finger side to the thumb side, and as a result, the left wrist is pressed clockwise to lock, and the back of the left hand is returned when the bat swing is performed. It also suppresses the flexion of the left elbow at the time of impact. This induces the action of "shaking the bat like hitting a grip", resulting in an increase in the angular velocity of the bat swing. It is preferable that the inclination angle α of the flare portion F with respect to the center line be increased by Δα according to the increased weight ΔM of the bat head. This is because, as the center of gravity moves toward the tip of the bat, an inertial force that makes it easier for the left back of the bat swing to return is exerted.

In this way, when the bat swing is performed along with the rotation of the body without returning the left batter of the right batter, and the left hand elbow is firmly extended and impacted, the action of "shaking the bat to hit the grip" can be realized, It is possible to obtain the maximum angular velocity of the batter in the swing. In the past, it is recommended to start swinging at an early stage to hit the in-course, hit the ball near the pitcher, delay the swing start to hit the out-course and bring in the ball, but the batting start timing Is not the same, so it is difficult. By using the bat of the structure of the present invention, the operation of “shaking 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 corner, the middle corner, and the outer corner (see FIG. 13C), and the swing is simple. Can be

The grip portion of the butt is gradually deformed from the grip end toward the center of the grip into an elliptical shape and then into a circular shape. In the case of an elliptical shape, the upper peripheral edge forms an inclined portion, but the grip end If there is no step on the side surface from the upper peripheral edge to the lower part, the little finger side of the bottom hand is slippery because the end is not raised. Therefore, in the second preferred embodiment, it is preferable to employ the various grip structures shown in the first preferred embodiment. Especially, when the palm of the bottom hand is brought into contact with the grip end from the grip end G from 1)' 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 A cross section orthogonal to the bat axis is of a substantially elliptical shape suitable for a palm grip that is gripped by the palm, and changes from at least the elliptical cross section of the grip portion to a 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-step grip formed by forming an inclined part,
The grip center Gc can be moved to Gc1, and the palm grip of the bottom hand can be secured, while the top hand grip can be selected from a half palm grip and a finger grip that open the little finger and thumb, and the hit center Pc is adjusted to Pc1. It is preferable that it is possible, and further, 3) at least a central portion of the semi-circumferential portion of the grip portion that is wrapped by the palm of the bottom hand and the upper hand and in the vicinity thereof, 3) form an area portion that increases the friction coefficient of the grip, and form a palm. It is preferable to enhance 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 (3)

In a baseball bat including a bat head H, a bat body B, a bat throat part T, a butt grip part B, and a grip end E, 1) the grip part B is perpendicular to a central axis extending in the bat longitudinal direction. In cross-sectional shape, from the grip end E to the bat throat section T, a non-circular roughly vertical elliptical shape changes to a circular shape of the bat throat section. The bottom hand and the upper hand (excluding the thumb and forefinger) have a length that allows palm grip, and 2) the grip end E is 20 to 30 with respect to the plane orthogonal to the central axis extending in the bat longitudinal direction. When the player holds the butt grip B with the bottom hand and has a sloping end surface, the bulging knob formed parallel to the end surface of the grip end B is larger than the grip section cross section at the boundary with the grip B. The butt length is increased so as to form a stepped portion having a cross-sectional area, and at least a portion from the tip of the little finger of the bottom hand to the second indirect portion abuts, while substantially not abutting the palm end portion below the little finger. With respect to the central axis extending in the direction, the shape is such that it bulges in the radial direction near the center of the knob side and contracts at the upper and lower ends, and controls the bottom hand that grips grip part B in the follow-through after downswing. Bat grip structure characterized by that. A bulging knob formed parallel to the end surface of the grip end B is bulged in the radial direction not only on the little finger tip side of the bottom hand but also on the little finger second indirect part to the third indirect part, and is formed on both sides. 1. The butt grip structure described in 1. 2. The butt grip according to claim 1, wherein the two-step grip having a cross-sectional shape that changes from a non-circular vertically elongated elliptical shape to a circular shape of the bat throat portion has a substantially elliptical shape which is substantially parallel to the butt throat portion T from the grip end E up and down.

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