JP2020005900A - Strike training bat - Google Patents

Abstract

A bat for batting practice with which an inside-out swing can be efficiently learned. A batting practice bat (1) is a main body extending along a linear central axis (CL) from a base end (2a) to a tip end (2b), and has a grip portion (21) provided near the base end (2a). and a hitting part 3 protruding from the main body 2 and including a hitting surface 31. - 特許庁At least when the bat for batting practice 1 hits a ball, the hitting surface 31 extends linearly when viewed from a direction perpendicular to the central axis CL. The striking surface 31 and the central axis CL on the base end portion 2a side form an angle θ of 90 degrees or more and less than 180 degrees. At least when the bat for batting practice hits a ball, the tip portion 2b is further away from the base end portion 2a than the starting point position R on the side of the base end portion 2a of the region RG of the main body 2 to which the hitting portion 3 is adjacent. [Selection drawing] Fig. 2

Description

  The present invention relates to a bat for hitting practice. More particularly, the present invention relates to a bat for hitting practice that can efficiently learn an inside-out swing.

  As one of the basic and ideal batting swings in baseball, a so-called inside-out swing is known. The inside-out swing is a swing in which the bat goes around the inside of the batter's body and goes outside.

  When an inside-out swing is performed, the pad deflects so that the head lags behind the grip at the start of the swing, and then, when the ball collides with the bat, the ball is gripped by the elasticity and inertia of the bat. The bud bends in such a way that the head comes forward more (in the opposite direction from the start of the swing). For this reason, the inside-out swing has an advantage that the ball's elastic force and inertia force are applied to the ball, and the ball's flight distance is increased. In addition, the inside-out swing has an advantage that the ball is easy to catch and an advantage that the swing speed is improved.

  A conventional batting practice bat is disclosed, for example, in Patent Document 1 below. Patent Document 1 below discloses a shaft, a grip provided at a base end portion of the shaft, a striking member provided movably in the axial direction of the shaft, and a hitting member provided at a distal end portion of the shaft. A swing exerciser having a hitting member that generates a hitting sound and an impact force by the impact member moving toward the distal end portion along the shaft due to centrifugal force and inertia due to the impact, is disclosed.

JP 2012-5806 A

  However, it has conventionally been difficult to efficiently learn the inside-out swing. Even if the batter understands the inside-out swing method, it is difficult to grasp whether or not the understanding is correctly reflected in the actual swing. The batter can also have his leader look at his swing and get advice from the leader. However, also in this case, it is difficult for the batter to grasp whether or not his or her own swing is correctly corrected to an inside-out swing by the advice of the instructor.

  An object of the present invention is to solve the above-described problem, and an object of the present invention is to provide a bat for hitting practice that can efficiently learn an inside-out swing.

  The batting practice bat according to one aspect of the present invention is a main body that extends along a linear central axis from a base end to a front end, and includes a main body including a grip portion provided near the base end. A striking portion including a striking surface, projecting from the main body, and at least when striking the ball with the striking bat, the striking surface extends linearly when viewed from a direction perpendicular to the center axis. The angle between the hitting surface and the central axis on the base end side is not less than 90 degrees and less than 180 degrees, and at least when the ball is hit with the hitting practice bat, the tip end is located at the base of the area of the main body adjacent to the hitting portion. It is farther from the base end than the start point on the end side.

  In the above-mentioned batting practice bat, preferably, the region of the main body adjacent to the hitting portion is located at a distance from the base end along the central axis that is 40% of the entire length of the main body along the central axis. Present on the tip side.

  In the above-mentioned batting practice bat, the distance from the main body to the end of the hitting surface, which is the end of the hitting surface remote from the main body, is preferably 30% or more and 45% or less of the entire length of the main body along the central axis. is there.

  Preferably, in the above-mentioned batting practice bat, the striking portion has a trapezoidal or triangular shape when viewed from a direction orthogonal to the central axis.

  Preferably, in the above-mentioned batting practice bat, the striking surface has an arc shape when the striking portion is viewed in a cross section orthogonal to the extending direction of the striking surface.

  The hitting practice bat preferably further includes an opening / closing member that holds the hitting portion in each of a state where the hitting portion is opened with respect to the main body and a state where the hitting portion is closed with respect to the main body.

  Preferably, the hitting practice bat further includes a fixing portion extending from the distal end portion in a direction orthogonal to the center axis and fixed to the main body and the hitting portion.

  Preferably, in the above-mentioned batting practice bat, the main body is adjacent to the grip portion on the distal end side, has a circular shape when viewed in a cross section orthogonal to the central axis, and has a portion whose diameter increases as the distance from the proximal end increases And a rectangular portion provided near the distal end and having a rectangular shape when viewed in a cross section orthogonal to the central axis, and a cross section provided between the tapered portion and the rectangular portion and orthogonal to the central axis. And a transition portion whose shape changes from a circular shape to a rectangular shape when viewed from the above.

  ADVANTAGE OF THE INVENTION According to this invention, the bat for hitting practice which can learn an inside-out swing efficiently can be provided.

FIG. 1 is a perspective view illustrating a configuration of a hitting practice bat 1 according to an embodiment of the present invention. It is a figure explaining position and size of each member of bat 1 for hitting practice. FIG. 3 is a cross-sectional view along the line III-III in FIG. 2. It is a figure which shows typically the movement of the hit training bat 1 when the batter performs the correct swing using the hit training bat 1 in one Embodiment of this invention. It is a figure which shows typically the movement of the batting practice bat 1 when the batter makes an incorrect swing using the batting practice bat 1 in one Embodiment of this invention. It is a figure showing the composition of bat 1 for hitting practice in the 1st modification of the present invention. It is a top view which shows the structure of the bat for hitting practice 1 in the 2nd modification of this invention. It is a top view showing composition of bat 1 for hitting practice in the 3rd modification of the present invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  [Structure of bat for hitting practice]

  FIG. 1 is a perspective view showing a configuration of a hitting practice bat 1 according to an embodiment of the present invention. FIG. 2 is a view for explaining the position and size of each member of the batting practice bat 1. FIG. 2A is a plan view when viewed from a predetermined direction (hereinafter, sometimes referred to as an upward direction) orthogonal to the center axis CL of the main body 2 and the projecting direction of the striking portion 3. FIG. 2B is a diagram showing a positional relationship of some members of the batting practice bat 1 along the central axis CL.

  With reference to FIG. 1 and FIG. 2, a batting practice bat 1 in the present embodiment includes a main body 2 and a batting unit 3. The main body 2 and the hitting portion 3 are made of wood such as white ash, blue duck, ash, or yachidamo, an alloy containing aluminum, copper, zinc, or the like, or carbon fiber. The main body 2 and the hitting portion 3 may be made of different materials, or may be made of the same material.

  The main body 2 extends along a linear center axis CL from the base end 2a to the tip 2b. The main body 2 includes a grip portion 21, a tapered portion 22, a transition portion 23, and a rectangular portion 24.

  The grip portion 21 is a portion that is gripped by the batter, and is provided near the base end 2a. A non-slip tape is wound around the grip portion 21. The grip portion 21 has a circular shape when viewed in a cross section orthogonal to the central axis CL. The cross-sectional diameter of the grip portion 21 is extremely small at a predetermined position in the direction of the central axis CL in the grip portion 21 and slightly increases from the predetermined position toward each of the tapered portion 22 and the base end portion 2a. ing.

  The tapered portion 22 is adjacent to the grip portion 21 on the tip 2b side. The tapered portion 22 has a circular shape when viewed in a cross section orthogonal to the central axis CL. The diameter of the cross section of the tapered portion 22 increases as the distance from the proximal end 2a increases (toward the distal end 2b).

  The transition portion 23 is adjacent to the tapered portion 22 on the side of the distal end portion 2b, and is provided between the tapered portion 22 and the rectangular portion 24. The transition portion 23 changes from a circular shape to a rectangular shape when viewed in a cross section orthogonal to the central axis CL.

  The rectangular portion 24 is provided near the tip 2b. The rectangular portion 24 has a rectangular shape when viewed in a cross section orthogonal to the central axis CL. The striking portion 3 is provided in a region of the rectangular portion 24 on the side of the tip 2b. In the present embodiment, the hitting portion 3 is fixed to the main body 2. The surface of the tip portion 2b of the rectangular portion 24 is flat.

  The hitting portion 3 protrudes from the main body 2. The impact portion 3 has a trapezoidal shape when viewed from above, and the width W (the length in the direction along the central axis CL) decreases at a constant rate as the distance from the main body 2 increases. . The striking portion 3 includes a striking surface 31, a back surface 32, a fixed surface 33, and a projecting surface 34. The hitting surface 31 faces the base end portion 2a, and extends linearly when viewed from above at least when the ball is hit with the hitting practice bat 1. Further, at least when the ball is hit by the hitting practice bat 1, when viewed from above, the angle θ formed by the hitting surface 31 and the central axis CL on the base end 2a side is 90 degrees or more and less than 180 degrees. Yes, and preferably between 110 ° and 130 °.

  The back surface 32 is provided on the side opposite to the hitting surface 31. The back surface 32 is a flat surface and extends perpendicularly to the center axis CL when viewed from above. The back surface 32 and the surface of the tip 2b are on the same plane.

  The fixing surface 33 and the protruding surface 34 are both flat, and are parallel to each other when viewed from above. The hitting portion 3 is fixed to the main body 2 on the fixing surface 33. The hitting portion 3 is fixed to the main body 2 by a method such as bonding. The protruding surface 34 is provided at a position farthest from the center axis CL in the hitting portion 3.

  Referring particularly to FIG. 2, a region of the main body 2 to which the striking portion 3 is adjacent (a region of the main body 2 with which the fixed surface 33 contacts) is defined as a region RG, and an end of the striking surface 31 on a side farther from the main body 2 is a striking surface The position along the center axis CL of the impact surface end 31a is referred to as a position P. At least when the ball is hit with the bat 1 for hitting practice, the tip 2b is farther from the base 2a than the starting point R on the base 2a side of the region RG. Preferably, distal end 2b is farther from base end 2a than position P. As a result, the shape of the batting practice bat 1 approaches a linearly extended shape like a general bat, so that the batter who swings the batting practice bat 1 feels a sense of swinging the general bat. Can give a feeling close to.

  Here, the entire length of the main body 2 along the central axis CL is defined as a length L1, the distance (shortest distance) from the main body 2 to the striking surface end 31a is defined as a distance L2, and the fixing surface 33 along the central axis CL. The distance from the base end 2a along the center axis CL of the end on the base end 2a side is referred to as a distance L3.

  The distance L2 is preferably 30% or more and 45% or less of the length L1. By setting the distance L2 to 30% or more of the length L1, it is possible to secure a necessary area as the hitting surface 31. By setting the distance L2 to be equal to or less than 45% of the length L1, it is possible to reduce an uncomfortable feeling that a batter can feel due to a centrifugal force applied to the hitting portion 3 during a swing.

  The region RG is located at a position Q1 where the distance from the base 2a along the center axis CL is 40% of the length L1 (more preferably, the distance from the base 2a along the center axis CL is longer. It is preferable that it exists on the tip 2b side with respect to the position Q2) where 70% of the height L1 is obtained. Thereby, the distance between the grip part 21 and the striking surface 31 can be secured, and the safety at the time of using the striking practice bat 1 can be improved.

  The length L1, the distance L2, the distance L3, and the mass can be appropriately set according to the age or the physique of the batter to be used, the method of using the bat 1 for hitting practice, and the like. For example, when the batter is generally a junior high school student or more, the length L1 is set to 55 cm to 65 cm, the distance L2 is set to 19 cm to 23 cm, the distance L3 is set to 40 cm to 50 cm, and the mass is set to 820 g to 920 g. Good. When the batter is generally less than or equal to an elementary school student, the length L1 may be set to 45 cm to 55 cm, the distance L2 may be set to 14 cm to 18 cm, the distance L3 may be set to 30 cm to 40 cm, and the mass may be set to 650 g to 750 g. Furthermore, when the bat 1 for hitting practice is used as a bat dedicated to single-handed use when learning the inside-out swing one hand at a time, the length L1 is 35 cm or more and 40 cm or less, the distance L2 is 13 cm or more and 17 cm or less, and the distance L2 is 13 cm or more and 17 cm or less. L3 may be set to 15 cm or more and 25 cm or less, and the mass may be set to 400 g or more and 500 g or less.

  FIG. 3 is a sectional view taken along the line III-III in FIG. The cross-sectional view of FIG. 3 is a cross-sectional view orthogonal to the direction in which the striking surface 31 extends. FIG. 3A is an example of a cross-sectional shape of the striking surface 31, and FIG. 3B is another example of a cross-sectional shape of the striking surface 31.

  Referring to FIG. 3, when viewed in a cross section orthogonal to the extending direction of striking surface 31, striking surface 31 may be formed as a flat surface as shown in FIG. It may have an arc shape as shown in FIG. In particular, when the striking surface 31 has an arc shape as shown in FIG. 3B, the striking surface 31 has a shape close to the striking surface of a general bat. Can be given a feeling close to the feeling of hitting a ball with a general bat.

  [How to use the batting practice bat]

  FIG. 4 is a diagram schematically illustrating the movement of the batting practice bat 1 when the batter makes a correct swing using the batting practice bat 1 according to one embodiment of the present invention. FIG. 5 is a diagram schematically illustrating the movement of the batting practice bat 1 when the batter makes an erroneous swing using the batting practice bat 1 according to the embodiment of the present invention.

  Referring to FIG. 4, ball BL is placed on tee TA. The batter adjusts the standing position when hitting the ball BL by bringing the hitting surface 31 into contact with the ball BL once, and then holds the hitting practice bat 1. When the batter performs a correct inside-out swing, the batter moves the grip portion 21 to the top from a state in which the batting practice bat 1 is held (FIG. 4A), and then the base end portion 2 a of the batter moves to the top. The batting practice bat 1 is moved so that it passes through the center of the body at the shortest distance, and then the tip 2b passes through the center of the body of the batter with a delay from the gripper 21 (FIG. 4B). ), And hits the ball BL placed on the tee TA with the hitting surface 31 (FIG. 4C).

  When the batter makes a correct inside-out swing using the batting practice bat 1, the tip 2b passes the center position of the batter's body with a delay from the gripper 21, so as shown in FIG. In addition, the hitting surface 31 at the moment of hitting the ball BL faces the front direction (center direction) CR, or the flow side (right side in the case of right strike, left side in the case of left strike) than the front direction CR. Turn around. As a result, the ball BL flies in the front direction CR, or flies to a region DR1 on the flowing side (right side region in the case of right-handing and left side region in the case of left-handing) than the front direction CR.

  On the other hand, when the batter makes an erroneous swing such as an outside-in swing or a swing in which the wrist is turned back (the back of the top hand is turned upward), the batter holds the batting practice bat 1 (FIG. 5). From (a)), after moving the grip 21 to the top, the batting practice bat 1 is moved so that the tip 2b passes the center of the batter's body almost simultaneously with the grip 21 (FIG. 5). (B)) The ball BL placed on the tee TA is hit with the hitting surface 31 (FIG. 5 (c)).

  When the batter makes an erroneous swing using the batting practice bat 1, the timing at which the tip portion 2b passes through the center of the batter's body is early, and therefore, as shown in FIG. The striking surface 31 at the moment of striking faces the pulling side (left side in the case of right-handing, right side in the case of left-handing) than the front direction (center direction) CR. As a result, the ball BL flies to a region DR2 on the pulling side (the left side region in the case of right-handing and the right side region in the case of left-handing) than the front direction CR. In addition, the swing that returns the wrist is not preferable because the struck ball is driven to rotate and the flight distance of the ball is reduced.

  [Effects of Embodiment]

  According to the above-described embodiment, the batter performs tee batting with the bat 1 for hitting practice, and checks whether or not his or her own swing is a correct inside-out swing based on the direction in which the ball flew. be able to. As a result, it is possible to efficiently learn the inside-out swing.

  The following effects can be further obtained by learning the inside-out swing. It is possible to wear a swing (a swing that makes an exquisite interval) that takes a sufficient takeback (movement of holding the bat from the state where the bat is held to the top). The swing that returns the wrist can be corrected. The hit point of the ball can be brought closer to the body, and a swing that pushes the ball with the back hand can be worn. You can wear a swing that hits the inside of the ball or a swing that catches the ball in a plane. The bat speed at the time of full swing (at the time of hitting) can be increased.

  [Modification]

  Subsequently, a modified example of the above-described embodiment will be described. In each modification, the configuration of the batting practice bat 1 other than that described is the same as the configuration of the batting practice bat in the above-described embodiment. The description will not be repeated.

  FIG. 6 is a view showing the configuration of the batting practice bat 1 according to the first modification of the present invention. FIG. 6A is a plan view showing a state where the hitting portion 3 is opened with respect to the main body 2. FIG. 6B is an enlarged view of the vicinity of the opening / closing member 4 in a state where the hitting portion 3 is opened with respect to the main body 2. FIG. 6C is a plan view showing a state in which the hitting portion 3 is closed with respect to the main body 2.

  Referring to FIG. 6, the hitting practice bat 1 of the first modified example further includes an opening / closing member 4. The opening / closing member 4 includes a state in which the hitting portion 3 is opened with respect to the main body 2 (FIG. 6A) and a state in which the hitting portion 3 is closed with respect to the main body 2 (FIG. 6C). The striking unit 3 is held.

  The opening / closing member 4 includes a fixed-side member 41 and a swing-side member 42. The fixed side member 41 includes a main body 41a having a U-shape and two shaft holes 41b. The main body 41a is engaged with the rectangular part 24, and is fixed to the rectangular part 24 by screws or bolts. The vicinity of both ends of the U-shaped portion of the main body portion 41a protrudes from the rectangular portion 24 toward the hitting portion 3 side. The two shaft fixing holes 41b are provided near both ends of the U-shape of the main body 41a.

  The swing side member 42 includes a shaft 42a and a main body 42b. Both ends of the shaft 42a are inserted into two shaft holes 41b, and the shaft 42a is swingably supported by the fixed member 41. The main body 42b is fixed to the shaft 42a. The main body 42b has a plate shape and is fixed to the striking surface 31 of the striking portion 3 with screws or bolts.

  In the case where the opening / closing member 4 is provided on the bat 1 for hitting practice, the back surface 32 is cut so that the striking surface 31 and the back surface 32 are parallel to each other in order to suppress an increase in mass due to the opening / closing member 4. Thus, the volume of the hitting portion 3 may be reduced. Also. The length of the main body 2 may be reduced to such an extent that the tip 2b is located between the position P along the center axis CL of the striking surface end 31a and the start point R.

  When using the batting practice bat 1, the batter keeps the batting unit 3 open with respect to the main body 2. When the hitting portion 3 is opened with respect to the main body 2, the configuration of the hitting practice bat 1 is substantially the same as that of the above-described embodiment. That is, the hitting portion 3 is fixed to the main body 2 in a state of protruding from the main body 2. The angle θ between the striking surface 31 and the central axis CL on the base end 2a side is 90 degrees or more and less than 180 degrees.

  On the other hand, when the batting practice bat 1 is not used (for example, when the batting practice bat 1 is transported), the batter closes the batting unit 3 with respect to the main body 2. When the striking portion 3 is closed with respect to the main body 2, the striking portion 3 is fixed to the main body 2 in a state of being folded toward the main body 2. The angle θ formed between the striking surface 31 and the central axis CL on the base end 2a side is substantially 0 degrees.

  Further, when using the batting practice bat 1, the batting practice bat 1 may be used in the following manner. The batter holds the batting practice bat 1 with the batting unit 3 closed with respect to the main body 2 and performs a full swing. When the batter performs a proper full swing at an appropriate interval, a sufficiently large centrifugal force is applied to the striking portion 3, and the striking portion 3 swings. As a result, when the ball is hit with the hitting practice bat 1, the hitting portion 3 is open with respect to the main body 2. On the other hand, when the batter makes an erroneous full swing without an appropriate interval, the centrifugal force applied to the hitting unit 3 is small, and the hitting unit 3 remains closed with respect to the main body 2.

  According to the first modification, the batting section 3 can be folded when the batting practice bat 1 is not used, so that the batting practice bat 1 can be easily transported. Also, when the batter performs a full swing with the batting unit 3 closed, the batter himself can easily confirm whether or not the correct full swing has been performed with an appropriate interval.

  FIG. 7 is a plan view showing a configuration of a hitting practice bat 1 according to a second modification of the present invention.

  Referring to FIG. 7, in the batting practice bat 1 of the second modified example, the batting section 3 includes a hollow portion 35. When viewed from above, the hollow portion 35 has, for example, a trapezoidal planar shape. The planar shape of the hollow portion 35 is arbitrary.

  When viewed from above, the hitting portion 3 may have an arbitrary planar shape, and may have a triangular planar shape instead of a trapezoidal planar shape. In other words, the hitting portion 3 does not include the protruding surface 34 and may have a sharp protruding portion K as shown by a dotted line.

  According to the second modified example, by providing the hollow portion 35, the mass of the hitting portion 3 can be reduced. Thereby, the position of the center of gravity of the batting practice bat 1 approaches the position of the center of gravity of a general bat, and the total weight of the batting practice bat 1 can be reduced. It can give a feeling close to the feeling when swinging a typical bat.

  FIG. 8 is a plan view showing a configuration of a hitting practice bat 1 according to a third modification of the present invention.

  Referring to FIG. 8, the hitting practice bat 1 of the third modified example further includes a fixing portion 5. The fixing portion 5 is fixed to the distal end portion 2b of the main body 2 and the back surface 32 of the hitting portion 3 by a method such as bonding. The fixing portion 5 has a plate shape and extends from the distal end portion 2b of the main body 2 in a direction orthogonal to the center axis CL. The fixing portion 5 may be made of the same material as the main body 2 or the hitting portion 3, or may be made of a material different from the main body 2 and the hitting portion 3.

  According to the third modification, the hitting portion 3 can be firmly fixed to the main body 2 and the hitting portion 3 can be reinforced.

  [Others]

  The above-described embodiments and modified examples can be appropriately combined.

  The above-described embodiments and modified examples should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Batting practice bat 2 Main body 2a Base end of main body 2b Tip of main body 3 Hitting part 4 Opening / closing member 5 Fixed part 21 Holding part 22 Taper part 23 Transition part 24 Rectangular part 31 Hitting face of hitting part 31a Hitting face end 32 Back surface of the hitting portion 33 Fixed surface of the hitting portion 34 Projection surface of the hitting portion 35 Hollow portion of the hitting portion 41 Fixed side member of the opening / closing member 41a Main body portion of the fixed side member 41b Shaft hole of the fixed side member 42 Swinging of the opening / closing member Side member 42a Oscillation side member shaft 42b Oscillation side member main body BL Ball CL Center axis CR Front direction DR1 Flowing side area DR2 Pulling side area K Projection L1 Overall length of main body along center axis L2 Distance from the main body to the impact surface end L3 Distance from the base end along the central axis P Position of the impact surface end along the central axis Q1 Distance from the proximal end along the central axis to the main body A position where the distance from the base end along the central axis is 70% of the entire length of the main body. RG A region of the main body where the hitting portion is adjacent. R A main body where the hitting portion is adjacent. Starting point position on the base end side of the region of TA TA W

Claims (8)

A bat for hitting practice,
A main body extending along a linear central axis from a base end to a front end, the main body including a grip portion provided near the base end,
A striking portion including a striking surface, projecting from the main body,
At least when the ball is hit by the hitting practice bat, when viewed from a direction orthogonal to the center axis, the hitting surface extends linearly, and the hitting surface and the base end side Make an angle of 90 degrees or more and less than 180 degrees with the central axis,
At least when hitting the ball with the hitting practice bat, the tip end is farther from the base end than a starting point on the base end side of an area of the main body adjacent to the hitting portion. For bat.   The region of the main body adjacent to the hitting portion is closer to the distal end than the position where the distance from the base end along the central axis is 40% of the entire length of the main body along the central axis. The bat for hitting practice according to claim 1, which is present on a side.   The distance from the main body to a striking surface end that is an end of the striking surface farther from the main body is 30% or more and 45% or less of the entire length of the main body along the central axis. The hitting practice bat according to 1 or 2.   The bat for hitting training according to any one of claims 1 to 3, wherein the hitting portion has a trapezoidal or triangular shape when viewed from a direction orthogonal to the central axis.   The bat for hitting practice according to any one of claims 1 to 4, wherein the hitting surface has an arc shape when the hitting portion is viewed in a cross section orthogonal to the extending direction of the hitting surface.   The opening / closing member which holds the hitting part in each of a state where the hitting part is opened with respect to the main body and a state where the hitting part is closed with respect to the main body, further comprising an opening and closing member. The bat for hitting practice described in Crab.   The bat for hitting practice according to any one of claims 1 to 6, further comprising: a fixing portion extending from the tip end portion in a direction orthogonal to the central axis and fixed to the main body and the hitting portion. . The body is
A tapered portion that is adjacent to the grip portion on the distal end side, has a circular shape when viewed in a cross section orthogonal to the central axis, and has a diameter that increases as the distance from the proximal end increases.
A rectangular portion provided near the distal end portion and having a rectangular shape when viewed in a cross section orthogonal to the central axis,
8. The method according to claim 1, further comprising: a transition portion provided between the tapered portion and the rectangular portion, wherein the transition portion changes from a circular shape to a rectangular shape when viewed in a cross section orthogonal to the central axis. 9. The bat for hitting practice described in Crab.

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