Batting form training tool

Abstract

To provide an efficient batting form.SOLUTION: A batting form training tool includes: a first arm 10 guiding one of arms to a prescribed location; and a second arm 20 guiding the other arm to a prescribed location. The first arm 10 has a first connection part 12 that connects to a grip part 31 of the bat body 30 the first arm 10 extending in a first direction. The second arm 20 has a second connection part 22 that connects to the grip part 31 of the bat body 30 a second arm 20 extending in a second direction different from the first direction. The first arm 10 and the second arm 20 guide respective forearms to prescribed locations at locations where they contact the respective forearms.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a batting form training device. [Background technology]

[0002] Conventionally, some practice bats are heavier than those used in games, which increases the load during practice swings and strengthens the muscles of the arms and wrists. There are also bats that have a weight attached to them that slides toward the tip of the bat, and when the bat is swung, the weight slides by centrifugal force and hits the head of the bat, allowing the player to grasp the meeting point by the sound and feel when hitting the ball (Patent Documents 1 and 2). However, such practice bats have the problem that they do not properly guide or correct the position and posture of the arms and the movement of the body, and do not lead to the mastery of an efficient batting form. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 08-24386 [Patent Document 2] Japanese Patent Application Publication No. 08-33744 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure has been developed with the objective of eliminating the above-mentioned drawbacks, and one of the objectives of the present disclosure is to provide a batting form training device that allows the user to master an efficient batting form.

[0005] A batting form training device according to one embodiment of the present disclosure comprises a first arm that guides one arm to a predetermined position and a second arm that guides the other arm to a predetermined position, the first arm having a first connecting portion that connects the first arm extending in a first direction to a grip portion of the bat body, and the second arm having a second connecting portion that connects the second arm extending in a second direction different from the first direction to the grip portion of the bat body, and the first arm and second arm connected to the bat body come into contact with each forearm and guide each forearm to the predetermined position.

[0006] The above configuration has the advantage of allowing players to master an efficient batting form. [Brief description of the drawings]

[0007] [Figure 1] 1 is a schematic perspective view showing a batting form training device according to one embodiment of the present disclosure. FIG. [Diagram 2] FIG. 2 is an exploded perspective view of the batting form training device of FIG. 1. [Diagram 3] FIG. 1 is a schematic perspective view showing a batting form training device in a ready state as an example of its use. [Figure 4] FIG. 1 is a schematic horizontal cross-sectional view from above showing an example of use of a batting form training device. [Diagram 5] 1A to 1C are schematic sequential side views showing an example of how to use a batting form training device. [Figure 6] 1A to 1C are schematic sequential diagrams showing examples of poor swings as comparative examples. [Figure 7] 1A to 1C are schematic sequential diagrams showing an example of how to use a batting form training device, viewed from the front (pitcher's side). [Figure 8] FIG. 13 is a schematic diagram of a hitting zone from the side of an example of use of the batting form training tool. [Figure 9] FIG. 1 is a schematic diagram showing a meeting zone of an example of a bad swing as a comparative example. [Figure 10] 1 is a schematic diagram from above showing the trajectory of the core of the bat body when using a batting form training device. [Figure 11]FIG. 13 is a schematic diagram showing the trajectory of the core of the bat body in an example of a bad swing as a comparative example. [Figure 12] FIG. 11 is a schematic perspective view showing a batting form training device according to another embodiment of the present disclosure. [Figure 13] FIG. 11 is a schematic perspective view showing a batting form training device according to another embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The present disclosure will be described in detail below with reference to the drawings. In the following description, terms indicating specific directions or positions (for example, "upper", "lower", and other terms including these terms) are used as necessary, but the use of these terms is for the purpose of facilitating understanding of the invention with reference to the drawings, and the meaning of these terms does not limit the technical scope of the present invention. In addition, parts with the same reference numerals appearing in multiple drawings indicate the same or equivalent parts or members. Furthermore, the embodiments shown below are specific examples of the technical ideas of the present invention, and do not limit the present invention to the following. In addition, the dimensions, materials, shapes, relative positions, etc. of the components described below are intended to be illustrative, and not to limit the scope of the present invention thereto, unless otherwise specified. In addition, the contents described in one embodiment or example can be applied to other embodiments and examples. In addition, the sizes and positional relationships of the members shown in the drawings may be exaggerated to clarify the explanation.

[0009] The present disclosure may be specified by the following configuration. A batting form training device according to one embodiment of the present disclosure includes a first arm that guides one arm to a predetermined position and a second arm that guides the other arm to a predetermined position, the first arm has a first connecting part that connects the first arm extending in a first direction to a grip part of a bat body, the second arm has a second connecting part that connects the second arm extending in a second direction different from the first direction to the grip part of the bat body, and the first arm and the second arm connected to the bat body contact each forearm and guide each forearm to a predetermined position. The forearm refers to the part from the wrist to the elbow.

[0010] The above configuration has the characteristic of being able to master an efficient batting form. When the batter grips the grip of the bat body and takes a stance, and when he swings, the first arm extending in a first direction and the second arm extending in a second direction connected to the grip of the bat body come into contact with each forearm, are attached to each forearm, support each forearm, and can guide each forearm to a predetermined position, posture, and angle, and the angle of the wrist gripping the bat body is constant, allowing for an efficient batting stance and swing. In this disclosure, an efficient batting form refers to a batting form that allows for a swing that satisfies at least one of the following: a swing that allows smooth movement of any of the body parts such as the arms, wrists, chest, waist, and lower body, or any of the linkages; a swing that allows the power of the swing to be efficiently transmitted to the ball; a swing with a wide meet zone for hitting the ball; a swing with a wide power zone for applying force; and a swing that allows an inside-out swing trajectory.

[0011] In the above configuration, the first arm and the second arm, which are arranged and fixed in a relative position, maintain the relative position of each forearm and guide each forearm to a predetermined position, posture, and angle, so that the batter can acquire an efficient batting form by taking a stance and swinging. The above configuration can simplify the batting form formed by the complex movement and linkage of the body, including the arms. The above configuration allows the batter to take an efficient batting form by taking each forearm to a predetermined position, posture, and angle with one or a few fixed points and attention points. For example, by setting the position of the wrist, the grip end of the bat body, or the angle of the bat body to a predetermined position or angle, the first arm and the second arm that contact each forearm can lead each forearm to a predetermined position, posture, and angle, so that the batter can take an efficient batting form. By attaching the first arm and the second arm to each forearm, a natural stance without putting force on the shoulders can be achieved. When the batter swings from that stance, the batter can make an appropriate approach to the impact, the trajectory of the bat is determined, and the swing can be optimized and stabilized. By tracing and repeating the appropriate swing, an efficient batting form can be practiced and mastered. The batting form training tool with the above extremely simple configuration can be used by anyone from children to adults, beginners to advanced players, and allows swings according to each person's skill, muscles, etc., and allows swings at different speeds, or the swing can be stopped midway to check smooth arm and body movements. For example, by swinging slowly, the position and posture of the arms and the movement of the body can be grasped and understood while swinging, and inefficient movements, forms, bad habits, etc. can be corrected. The above configuration allows easy repeated practice and allows efficient batting forms to be traced, so that the position and posture of the arms, body movements, and swing trajectory can be stabilized, the linkage between both arms and the upper body, waist, and lower body can be smoothed, and unnecessary movements can be reduced, and as a result, the batter can master each person's stance and swing type (shape). The stance and swing type can shorten the period in which beginners master an efficient batting form, and contribute to the improvement of efficient batting. In addition, the stance and swing pattern are useful for improving, correcting, identifying problems, and dealing with slumps in batting according to each individual's level, regardless of the individual's level.After mastering the stance and swing style, by repeatedly making adjustments and trying them out, and gaining experience in a variety of areas such as good and bad form, actual hitting, and matches, you can further refine your batting form and further improve your batting, thereby expanding the range of your capabilities.

[0012] In another embodiment of the batting form training tool of the present disclosure, the first direction can be perpendicular to the bat body. The above configuration has a feature that the first arm extending in the first direction perpendicular to the bat body can be brought into contact with the forearm of one arm to guide the bat to a predetermined position and posture, and the angle of the wrist gripping the bat body is constant, so that the approach, swing, and bat trajectory from the stance to the impact are determined and stabilized, allowing the batter to master an efficient batting form. In the present disclosure, "perpendicular" includes approximately perpendicular, specifically indicating that the bat intersects with the bat at an angle of 85 degrees or more and 95 degrees or less. "The first direction is perpendicular to the bat body" indicates that the first arm has a portion extending in the first direction, including the case where the first arm has a portion extending partially in the first direction. The first arm is not limited to being linear. The same applies to the second direction and the second arm described below.

[0013] In a batting form training device according to another embodiment of the present disclosure, the second direction can be a direction perpendicular to the bat body. The above configuration has the feature that the second arm extending in the second direction perpendicular to the bat body can contact the forearm of the other arm to guide it to a predetermined position and posture, and the angle of the wrist gripping the bat body is constant, so that, for example, the approach from stance to impact, the swing, and the bat trajectory are determined and stabilized, allowing the player to master an efficient batting form.

[0014] A batting form training device according to another embodiment of the present disclosure can have a first direction parallel to the X-axis and a second direction parallel to the Y-axis with respect to a bat body extending in a third direction parallel to the Z-axis. The above configuration has the feature that the first arm extending in the X-axis direction and the second arm extending in the Y-axis direction contact, support and support each forearm with respect to the bat body extending in the Z-axis direction, and can guide the bat to a predetermined position, posture, angle and relative position, and also the angle of the wrist gripping the bat body is constant, so that, for example, the stance, approach to impact, swing and bat trajectory are determined and stabilized, allowing an efficient batting form to be mastered.

[0015] In a batting form training device according to another embodiment of the present disclosure, either or both of the first arm and the second arm can be rotatably connected to the bat body. The above configuration has the advantage that the position of the first arm or the second arm can be changed and adjusted according to the batter's individual body type, height, arm length, physical strength, level, condition, etc., allowing the batter to practice and master an efficient batting form suited to each individual. In addition, by changing the fixed position of either the first arm or the second arm, the device can be used by both left-handed and right-handed batters.

[0016] In a batting form training device according to another embodiment of the present disclosure, either or both of the first arm and the second arm can be detachably connected to the bat body. The above configuration has the advantage that the position of the first arm or the second arm can be changed and adjusted, allowing each person to master an efficient batting form. In addition, the first arm or the second arm can be replaced, and the first arm and the second arm can be attached to different bat bodies, allowing an efficient batting form to be mastered by selecting a bat body. In addition, the detachable first arm and second arm are also advantageous in that they can be conveniently used for storage, carrying, etc.

[0017] In the batting form training device according to another embodiment of the present disclosure, the first arm and the second arm can be arranged in an upper and lower position. The above configuration has the feature that the first arm and the second arm arranged in the upper and lower positions contact, support, and guide the forearm to a predetermined position and posture, for example, the stance and approach to the impact, the bat's trajectory, and the swing are determined and stabilized, and an efficient batting form can be acquired. For example, a right-handed batter can have the left hand on the pitcher side grip the lower side close to the grip end, and the right hand on the catcher side grip the upper side, and the lower first arm contacts the left forearm and the upper second arm contacts the right forearm, and can be guided to a predetermined position and posture. The above configuration can have one or both forearms arranged between the first arm and the second arm arranged in the upper and lower positions, and for example, one hand can grip the grip part between the first arm and the second arm arranged in the upper and lower positions.

[0018] In a batting form training device according to another embodiment of the present disclosure, the angle (θ) between the first arm and the second arm on the horizontal plane can be 60 degrees or more and 120 degrees or less. The "horizontal plane" is a plane perpendicular to the bat body extending vertically. The angle (θ) indicates the degree of opening assuming that the first arm and the second arm are on the same plane. The above configuration has the feature that the first arm and the second arm arranged at a constant horizontal opening angle (θ), for example 90 degrees, contact each forearm, and the relative position of each forearm is maintained and each forearm is guided to a predetermined position and posture, for example, by determining and stabilizing the stance, swing, especially the approach to impact, and the bat trajectory, and thus an efficient batting form can be mastered. The above configuration simplifies the many and complex combinations and interlocking elements of batting by guiding both arms to the proper posture and position with the first arm and the second arm fixed at a constant opening angle (θ), and realizes an efficient batting form by assisting, guiding, and encouraging the proper movement and interlocking of the body from the stance and the top to the impact. The above configuration also has the feature that it can be adapted to the preferences of each individual by changing and adjusting the angle (θ) of the first arm and the second arm according to the batter's individual body type, height, arm length, physical strength, level, condition, etc., and allows each individual to master an efficient batting form. The above configuration also allows the angle (θ) to be changed gradually and in stages when correcting, changing, adjusting, or checking the batting form, reducing discomfort, and avoiding problems such as losing one's condition due to a sudden change. The first arm 10 and the second arm 20 fixed to the bat body at a constant opening angle (θ) can clarify the checkpoints when each batter is taking the stance. Check points include, for example, the position of grip end 31a, the angle of bat body 30, the position and direction of the wrist, the position of the elbow, the position and posture of the forearm, the relative position, etc. By adjusting the angle (θ) between first arm 10 and second arm 20, the stance, swing, and form can be adjusted to suit the batter's preferences.

[0019] In a batting form training device according to another embodiment of the present disclosure, the first connecting part and the second connecting part can be connected. The above configuration has the advantage that by connecting the first connecting part and the second connecting part to the bat body in addition to connecting the first connecting part and the second connecting part to the bat body, the connection strength of the first arm and the second arm to the bat body can be improved, and the first arm and the second arm can be reliably held in a predetermined position and posture without misalignment, allowing an efficient batting form to be mastered.

[0020] In the batting form training device according to another embodiment of the present disclosure, the first arm and the second arm can be made of plastic. The above configuration has the advantage of being lightweight, easy to swing, and allowing the user to master an efficient batting form. It also has the advantage of being inexpensive to manufacture and easy to mold into a shape that matches the forearm that it contacts. It also has the advantage of being able to have elastic parts and different elasticities depending on the thickness, material, etc.

[0021] A batting form training device according to another embodiment of the present disclosure comprises a bat body, a first arm that guides one arm to a predetermined position, and a second arm that guides the other arm to a predetermined position, and comprises a first connecting portion that connects the first arm extending in a first direction to the grip portion of the bat body, and a second connecting portion that connects the second arm extending in a second direction different from the first direction to the grip portion of the bat body, and can guide each forearm to the predetermined position at a position where the first arm and the second arm contact each forearm.

[0022] The above configuration has the characteristic of being able to master an efficient batting form. When the batter grips the grip of the bat body and takes a stance, and when he swings, the first arm extending in a first direction and the second arm extending in a second direction connected to the grip of the bat body come into contact with each forearm, are attached to each forearm, support each forearm, and can guide each forearm to a predetermined position, posture, and angle, and the angle of the wrist gripping the bat body is constant, allowing for an efficient batting stance and swing. The above configuration allows the first arm and the second arm, which are arranged and fixed in relative positions, to maintain the relative positions of each forearm and guide each forearm to a predetermined position, posture, and angle, thereby allowing the batter to take a stance and swing efficiently. The above configuration can simplify the batting form that is formed by the complex movements and linkage of the body, including the arms. The above configuration allows each forearm to be set in a predetermined position, posture, and angle with one or fewer fixed points and attention points of the batter, allowing for an efficient batting stance. For example, by setting the position of the wrist, the grip end of the bat body, or the angle of the bat body to a predetermined position or angle, the first arm and the second arm that contact each forearm guide each forearm to a predetermined position, posture, and angle, allowing for an efficient batting form. By attaching the first arm and the second arm to each forearm in their respective positions, a natural posture without straining the shoulders can be achieved. When the batter swings from that posture, he or she can approach the ball appropriately until the impact, the trajectory of the bat is determined, and the swing can be optimized and stabilized. The above configuration allows the batter to easily and repeatedly practice an efficient batting form, stabilizing the position and posture of the arms, body movement, and swing trajectory, smoothing the linkage between both arms and the upper body, waist, and lower body, and reducing unnecessary movements. As a result, the batter can learn each person's posture and swing style (shape), and can practice and master an efficient batting form.The stance and swing form can shorten the time it takes for beginners to improve, and is useful for improving, improving, correcting, identifying problems, and dealing with slumps in batting at each level, regardless of level. It is also useful to think and understand while adjusting and changing the form, which leads to efficient practice and mastery of batting form. The above batting form training device with an extremely simple configuration can be used by children and adults, beginners and advanced players, and allows swings according to each person's skill, muscles, etc., and allows swings at different speeds, or the swing can be stopped halfway to check smooth arm and body movements. For example, by swinging slowly, the position and posture of the arms and the movement of the body can be grasped and understood while swinging, and inefficient movements, forms, bad habits, etc. can be corrected. (Embodiment 1)

[0023] 1 to 5A-5E, 7A-7C, 8, and 10 show a batting form training device 100 according to embodiment 1. The batting form training device 100 in the figures includes a bat body 30, a first arm 10 connected to the bat body 30 via a first connecting portion 12, and a second arm 20 connected to the bat body 30 via a second connecting portion 22.

[0024] Examples of using the batting form training tool are shown in Figs. 3, 4, 5A-5E, 7A-7C, 8, and 10. Fig. 3 shows an example of a right-handed batter taking a stance using the batting form training tool 100. In the batting form training tool 100 shown in Fig. 3, the first arm 10 contacts, supports, and guides the forearm on the pitcher's side (left forearm) and the second arm 20 contacts, supports, and guides the forearm on the catcher's side (right forearm) to a predetermined position and posture. The following explanation is based mainly on a right-handed batter, but the left-handed batter can also use it in the same way. In the case of a left-handed batter, the forearm on the pitcher's side is the right forearm, and the forearm on the catcher's side is the left forearm. By making either the first arm or the second arm or both rotatable, and by making the first arm and the second arm detachable, the tool can be used by either left-handed or right-handed batters. (Bat body 30)

[0025] Bat body 30 has a grip portion 31 that a batter holds with both hands, and a hitting portion 32 with which to hit the ball. Hitting portion 32 has a core 33 (sweet spot) where the ball is met between the head at the upper end and grip portion 32. Grip portion 32 may also have a grip end 31a at its lower end. The right-handed batter in FIG. 3 holds grip portion 31 with his left hand underneath and his right hand on top of it. The direction in which bat body 30 extends is defined as a third direction. In FIGS. 1 to 3, the third direction is defined as the Z-axis direction.

[0026] This disclosure does not specify the shape, size, length, outer diameter, material, etc. of the bat body 30, but for example, the bat body 30 in FIG. 1 is cylindrical with an outer diameter that narrows from the ball-hitting portion 32 toward the grip portion 31. The bat body 30 can be, for example, an actual bat, a bat for practice swings, or a dedicated bat for the batting form training device 100. When an actual bat is used for the bat body 30, it is possible to practice hitting a ball, such as tee batting. The bat for the batting form training device 100 can be, for example, the same or different shape, length, size, outer diameter, mass, etc. as an actual bat, and can be a bat that imitates an actual bat and has the same or similar shape, length, size, outer diameter, mass, etc. For example, the bat body 30 is lighter than an actual bat, making it easier to swing and allowing the batter to swing without worrying about the weight of the bat, and has the advantage of making it easier for the batter to swing while being conscious of the position of the arms, the movement of the body, the trajectory of the bat, etc. In addition, children and women who do not have sufficient muscle strength to swing the bat can also swing the bat without being swung around by its weight, which is advantageous in that they can practice their batting form and improve their technique. For example, a bat body 30 that is shorter than an actual bat can be made lighter, and it is easier to be aware of the position and movement of the wrist and grip part 31, which is advantageous in that it is easier to swing in a narrow space. In addition, for example, the bat body 30 can be made to have a structure that allows it to be stretched, extended, disassembled, etc., so that the length and weight can be adjusted, and it can be convenient to store. The bat body 30 can be made into a shape other than a cylindrical shape that becomes thinner toward the grip part side. For example, it can be provided with unevenness, lines, colors, marks, etc., and can be made into a shape or structure that produces wind noise during swinging, and can be made into a shape, structure, or aspect that makes it easy to grasp and recognize the trajectory of the bat body 30, the trajectory of the core 33 of the bat body 30, the impact, the wrist turn, and the rotation relative to the axial direction of the bat. (First arm 10)

[0027] The first arm 10 contacts or supports the forearm of one arm, thereby guiding the forearm to a predetermined position and posture. The first arm 10 has a contact portion 11 that contacts either the forearm, the hand, or the wrist, and a first connecting portion 12 that connects the first arm 10 extending in a first direction to the grip portion 31 of the bat body 30. The contact portion 11 contacts and supports at least a part of the forearm. In FIG. 3, the first arm 10 has the contact portion 11 on the upper side. The first arm 10 in FIG. 3 and FIG. 4 is disposed on the lower side of the forearm of the front arm on the pitcher side (left forearm), and the upper contact portion 11 of the first arm 10 contacts the left forearm from below, supports it, and guides the left forearm to a predetermined position and posture. The configuration in which the first arm 10 supports the forearm from the underside can stably support the forearm. The upper contact portion 11 of the first arm 10 can guide the left forearm to a parallel posture with the first arm 10. Furthermore, by fixing the first arm 10 to the grip portion 31 via the first connecting portion 12, the angle of the left wrist can be determined during the stance and swing, and the left forearm can be guided to a predetermined position, for example a vertical position, with respect to the bat body 30 without the left wrist shaking. The first arm 10 stably supports the left forearm, and limits and prevents the left forearm from deviating from a predetermined position or position within a certain range, guiding it to a predetermined position or position within an appropriate range, and also checking and correcting bad habits. The contact portion 11 in FIG. 3 is attached to the underside of the forearm, but it can also be attached to the side or top of the forearm.

[0028] First arm 10 has a portion that extends in a first direction. In Figs. 1 to 3, bat body 30 extends in a third direction (Z-axis direction), and the first direction is the X-axis direction. First arm 10 extending in the first direction can determine the angle between bat body 30 and the left forearm (90 degrees in Fig. 1), and the angle of the left wrist gripping grip portion 31. This angle between the left forearm and left wrist allows for a relaxed stance and grip that does not put strain on the shoulders, allowing for a smooth approach and the ability to push off strongly at impact without losing to the momentum of the ball.

[0029] This disclosure does not specify the shape, size, length, material, number, etc. of the first arm 10. The first arm 10 is within an appropriate range in which it can contact the forearm, be placed on the forearm, or support the forearm, and guide the forearm to a predetermined position and posture. For example, FIG. 1 shows the first arm 10 as a straight cylindrical shape. The cylindrical shape can reduce the weight of the first arm 10, and can be easily manufactured at low cost, reducing costs, and can ensure the strength to guide the forearm. However, the first arm 10 and the contact portion 11 can be entirely or partially linear, curved, cylindrical, rod-shaped, plate-shaped, curved, flat, or a combination of these. For example, the contact portion 11 of the first arm 10 can have a curved, concave, U-shaped, L-shaped, or other shape that matches the shape and area of ​​the part that contacts the forearm. The length of the first arm 10 is, for example, 5 cm to 40 cm, preferably 10 cm to 35 cm. By making the first arm 10 longer, it is possible to easily support the forearm from the wrist to the elbow, and if the first arm 10 is too short, there is little contact with the forearm and it is difficult to guide the forearm to a specified position and posture. Conversely, if the first arm 10 is too long, it becomes an obstacle or hindrance to the swing. In addition, it is preferable that the first arm 10 supports the forearm on one side and easily comes off the forearm on the other side. This is because, in an efficient batting form, the linear first arm 10 comes off the forearm during the swing toward the impact. By making it easier for the batter to recognize when the first arm 10 contacts and supports the forearm and when the first arm 10 does not support the forearm during the swing, it is possible to confirm the movement of the swing and the forearm. One or more first arms 10 or contact parts 11 can be provided. Each first arm 10 or contact part 11 can be attached to the forearm at a position that does not interfere with the swing, such as the lower surface, side surface, or upper surface of the forearm. In addition, the contact area, strength, condition, etc. can be determined according to the purpose, such as to only slightly contact the part that strongly supports and guides, or to restrict and check the movement of the arm. For example, the first arm 10 can be made of plastic to reduce weight, maintain strength, and reduce manufacturing costs. All or a part of the first arm 10 can be made elastic so that it can change shape or its position according to the movement of the arm. It can also be covered with an elastic material. It can also be covered with a material that adjusts the sliding, contact, and support of the first arm 10. (First connecting portion 12)

[0030] The first connecting part 12 connects the first arm 10 to a predetermined position of the bat body 30. The first connecting part 12 in FIG. 1 and FIG. 3 connects and fixes the first arm 10 to the grip part 31. This disclosure does not specify the connecting method, connecting structure, shape, size, material, etc. of the first connecting part 12, but for example, FIG. 1 and FIG. 2 show the first connecting part 12 as a cylindrical shape that is inserted into the grip part 31 and fixed. For example, the first connecting part 12 having a structure and shape that inserts a cylindrical shape or covers or sandwiches the grip part 31 makes it easy to connect the first arm 10 to the bat (bat body 30) owned by each person, and is also easy to remove and replace, making it convenient to use. The first connecting part 12 needs to have a connecting strength to the bat body 30 and the first arm 10 that can withstand a swing. The first connecting part 12 has a connection strength to the bat body 30 and the first arm 10 that can withstand the impact of a hitting ball, so that the first arm 10 can be connected to a bat (bat body 30) used for actual hitting, and can also be used for actual hitting practice such as tee batting. The first connecting part 12 and the second connecting part 22 described below can themselves be the grip part 31, which can be connected and fixed to the bat body 30. The first connecting part 12 can have a shape and structure that doubles as the grip part 31. When the first connecting part 12 doubles as the grip part 31, it is preferable that the outer diameter of the grip part 31, the gripping condition of the grip part 31, etc. do not cause an uncomfortable grip. The method of connecting and fixing the first connecting part 12 is not specified, and may be, for example, by fastening one or more screws, by fastening or loosening the first arm 10 while rotating it, by clamping, by a buckle, a wire, a dial, or by using Velcro (registered trademark), or by connecting the first connecting part 12 to the bat body 30 in a manner that also serves as the grip part 31, or by providing a core material in the bat body 30 and / or the first connecting part 12 to connect the bat body 30 and the first connecting part 12, thereby connecting the first connecting part 12 to the predetermined position. The first connecting part 12 may be made of the same or different material as the first arm 10, and may be made of, for example, plastic, ceramic, metal, or the like. The first connecting part 12 may be provided with a strong reinforcing material such as metal to improve the connection strength of the first arm 10. The first connecting part 12 may be any connector that can connect and fix the first arm 10 extending in the first direction to the predetermined position of the bat body 30.The first connecting part 12 and the bat body 30 can be positioned and fitted together by providing concaves and convexes, fitting parts, etc., and can also improve the strength of the connection and fixation. The first connecting part 12 can be an integral part or a separate part with the first arm 10 or the bat body 30 (grip part 31), or the second connecting part 22 described later. The first connecting part 12 holds the first arm 10 in a predetermined position. The first connecting part 12 in FIG. 1 connects the first arm 10 vertically to the bat body 30. The first arm 10 connected vertically to the bat body 30 comes into contact with the forearm of one arm (the forearm of the left arm) and is guided to a predetermined position and posture, and the angle of the left wrist gripping the bat body 30 is kept constant, allowing the player to take a stance (FIG. 3), and the forearm and left arm move while the upper body, waist, and lower body are linked, allowing the player to approach the impact (FIGS. 5A-5E). The first connecting part 12 can connect the first arm 10 to the bat body 30 in a detachable manner. In this case, the connection position can be adjusted and changed, making it possible to attach the first arm 10 to a different bat body 30, and allowing the first arm 10 to be replaced if damaged.

[0031] The first connecting part 12 determines the connecting position and connecting posture of the first arm 10. The first connecting part 12 connects the first arm 10 extending in a first direction to the bat body 30. For example, the first connecting part 12 in FIG. 1 and FIG. 3 connects the first arm 10 perpendicularly to the bat body 30, with the first direction (X-axis direction) being perpendicular to the third direction (Z-axis direction) of the bat body 30. The first arm 10 in FIG. 3 is disposed and connected to a lower position of the grip part 31 than the second arm 20, and contacts, supports, and guides the forearm of the left arm on the front side (pitcher side) to a predetermined position and posture. The first connecting part 12 can connect the first arm 10 to the grip part 31 rotatably around the Z-axis, and can adjust and change the connecting position and connecting posture of the first arm 10.

[0032] The first connecting part 12 can connect the first arm 10 movably. The first connecting part 12 can adjust and change the position of the first arm 10, and the first arm 10 can be set to a posture according to the movement of the body and arm, and the angle can be set according to the batter. For example, the first connecting part 12 can connect the first arm 10 to the bat body 30 (grip part 31) so that it can move up and down. The first connecting part 12 can also connect the first arm 10 so that it can tilt up and down, and can also connect the first arm 10 so that it can rotate around its axis. For example, the first connecting part 12 can connect the first arm 10 to the bat body 30 so that it can tilt downward (in the Z-axis direction) from a vertical posture. The first arm 10, which is in a vertical position at the beginning of a swing such as a stance, contacts the forearm to maintain the angle (approximately a right angle) between the position of the forearm and wrist and the bat body 30, and as the position of the forearm and wrist and the angle of the bat body 30 change during the swing, including before and after the action of pushing the bat body 30 toward the center, the first arm 10 moves downward from the vertical position, thereby responding to changes in the movement and angle of the forearm. Furthermore, for example, the tilt and range of motion of the first arm 10 can be limited, the strength of the movement can be varied to suppress movement in an inappropriate direction, and a recognition sound can be emitted when the first arm 10 has moved beyond a certain level, making it possible to check the appropriateness of the body movement and batting form. (Second arm 20)

[0033] The second arm 20 contacts or supports the forearm of the other arm different from the arm that the first arm 10 contacts, thereby guiding the forearm to a predetermined position or posture. The second arm 20 has a contact portion 21 that contacts either the forearm, the hand, or the wrist, and a second connecting portion 22 that connects the second arm 20, which extends in a second direction different from the first direction, to the grip portion 31 of the bat body 30. The contact portion 21 contacts and supports at least a part of the forearm. The second arm 20 contacts or supports the forearm of the rear arm on the catcher side (right forearm) to guide the forearm to a predetermined position and posture. The second arm 20 in FIG. 3 and FIG. 4 is disposed under the right forearm and supports the right forearm, so that the right forearm can be guided to a posture approximately parallel to the second arm 20 at a position above the second arm 20. In addition, the second arm 20 is fixed to the grip portion 31 via the second connecting portion 22, so that the angle of the right wrist can be determined and the right forearm can be guided to a predetermined position, for example, a vertical position, relative to the bat body 30. The second arm 20 restricts and prevents the right forearm from deviating from a predetermined position or position, and guides it to a predetermined position or position within an appropriate range, thereby enabling bad habits to be confirmed and corrected. The contact portion 21 in FIG. 3 is attached to the lower surface of the forearm, but it can also be attached to the side or upper surface of the forearm. The second arm 20 and the second connecting portion 22 are the same as the first arm 10 and the first connecting portion 12, unless there is any inconvenience or contradiction.

[0034] The second arm 20 has a portion that extends in a second direction. In Figs. 1 to 3, the bat body 30 extends in a third direction (Z-axis direction), and the second direction is the Y-axis direction. The second arm 20 that extends in the second direction can determine the angle between the bat body 30 and the right forearm (90 degrees in Fig. 1), and the angle of the wrist that grips the grip part 31. The angle of the right forearm and wrist, like the first arm 10 and the left forearm and wrist, allows for a relaxed stance and grip without straining the shoulders, allowing for a smooth approach and a strong push-out of the ball. For a right-handed batter, the left arm is the arm that leads the bat, and the right arm is the arm that supports and pushes the leading left arm from behind.

[0035] The present disclosure does not specify the shape, size, length, material, number, etc., of the second arm 20. The second arm 20, the contact portion 21, and the second connecting portion 22 are within an appropriate range in which they can contact the forearm or be attached to the forearm to guide the forearm to a predetermined position and posture, and may be the same or different in shape, size, length, material, number, structure, connecting method, fixing method, etc. as the first arm 10, the contact portion 11, and the first connecting portion 12 described above. For example, the second arm 20 is a straight cylindrical shape in FIG. 1, but it may be in another shape. The length of the second arm 20 is, for example, 5 cm or more and 40 cm or less, preferably 10 cm or more and 35 cm or less. This is because the second arm 20 is in proper contact with the forearm and does not interfere with the swing. For example, one second arm 20 or contact portion 21 (FIG. 3) or more may be provided. Each second arm 20 or contact portion 21 can be in contact with the forearm and attached at a position that does not interfere with the swing, such as the lower surface, side surface, or upper surface of the forearm. In addition, the contact area, strength, condition, etc. can be determined according to the purpose, such as to only slightly contact the part that strongly supports and guides, or to restrict and check the movement of the arm. For example, the second arm 20 can be made of plastic to reduce weight, maintain strength, and reduce manufacturing costs. The second arm 20 can be made of an elastic body or covered with an elastic material. The second arm 20 can be integrated with any of the first arm 10, the first connecting part 12, and the second connecting part 22 in terms of components or functions. For example, the first arm 10 and the second arm 10 can be integrated by rotating them, or can be integrated with the bat body 30 by folding them, or can be further detached and made compact for convenient storage and carrying. (Second connection part 22)

[0036] The second connecting part 22 connects the second arm 10 to a predetermined position on the bat body 30. The second connecting part 22 in FIG. 1 and FIG. 3 is disposed above the first connecting part 12 and connects and fixes the second arm 20 to the grip part 31. This disclosure does not specify the connecting method, structure, shape, size, material, etc. of the second connecting part 22, and any connecting device that can connect and fix the second arm 20 extending in the second direction to a predetermined position on the grip part 31 of the bat body 30 can be used. The second connecting part 22 can have the same or different shape, structure, connecting method, and fixing method as the first connecting part 12 described above. For example, the second connecting part 22 can connect the second arm 20 to the bat body 30 in a detachable manner. The second connecting part 22 determines the connecting position and connecting posture of the second arm 20. The second connecting part 22 can connect the second arm 20 to the grip part 31 so as to be rotatable about the Z-axis, and the connecting position and connecting posture of the second arm 20 can be adjusted and changed. The first connecting part 12 and the second connecting part 22 can connect the first arm 10 and the second arm 20 so as to be rotatable, foldable, movable, tiltable, and detachable. The first connecting part 12 and the second connecting part 22 are connected to each other and connected and fixed to the grip part 31, thereby improving the connecting strength and fixing strength. The first connecting part 12 and the second connecting part 22 in FIG. 1 are each arranged vertically as a cylinder and connected to each other, but in addition to this, for example, as shown in FIG. 12, the semi-cylindrical first connecting part 12 and the semi-cylindrical second connecting part 22 can be joined to form a cylinder.

[0037] The first connecting part 12 or the second connecting part 22 can rotatably connect the first arm 10 and / or the second arm 20 to the bat body 30. By connecting either or both of the first arm 10 and the second arm 20 to the central axis (Z-axis) of the bat body 30 so as to be rotatable, the respective positions and the relative positions of the first arm 10 and the second arm 20 can be changed and adjusted, and the positions can be set to correspond to either left-handed or right-handed batters. The first arm 10 and the second arm 20 can be positioned at an angle (θ) of, for example, 60 degrees or more and 120 degrees or less, preferably 70 degrees or more and 110 degrees or less, on the horizontal plane. This batting form training tool 100 can change and adjust the angle (θ) of the first arm and the second arm according to the body type, height, arm length, physical strength, level, condition, etc. of each batter, and can adjust the arm shape and position to suit each batter, allowing each person to master an efficient batting form. For example, you can start from 90 degrees and widen or narrow it to find a different angle (θ) that suits you. You can imitate the angles, swings, and forms of famous players. Also, by swinging at different angles (θ), you can grasp the difference, give yourself an opportunity to think about and trace your body movements, form, and swing, and make it easier to grasp, recognize, understand, and concretely imagine the advantages of an efficient batting form and body movements compared to when you cannot swing smoothly or favorably, which can contribute to improving your batting form.

[0038] The first connecting part 12 or the second connecting part 22 can arrange and connect the first arm 10 and the second arm 20 at the same or different heights and postures on the Z axis. FIG. 1 shows the basic form of a batting form training device 100. This batting form training device 100 arranges the first arm 10 extending in a first direction (X axis direction) and the second arm 20 extending in a second direction (Y axis direction) with respect to the bat body 30 extending in a third direction (Z axis direction). In FIG. 1, the first arm 10 is arranged at a lower position and the second arm 20 is arranged at an upper position, both of which are arranged in upper and lower positions, and the first arm 10 and the second arm 20 are arranged at different heights, extending in the first direction and the second direction, respectively, and are in a twisted positional relationship where the first direction and the second direction intersect. The first arm 10 and the second arm 20 in the figure extend linearly with the same interval and height difference, and the first arm 10 and the second arm 20 are arranged in a parallel posture on a plane at different heights. FIG. 3 shows an example in which the first arm 10 and the second arm 20, which are arranged at upper and lower positions, are positioned below each forearm and support each forearm from below. The first arm 10 and the second arm 20 can stably support each forearm by placing it on each arm. The first arm 10 and the second arm 20 can be attached to each forearm at a predetermined position depending on their arrangement, posture, and shape. For example, they can be attached to the lower and lower sides of the forearm and each forearm (FIG. 3), as well as the lower and upper sides, upper and upper sides, upper and side sides, lower and side sides, etc. The height difference between the first arm 10 and the second arm 20 is appropriately determined according to the position where each arm is attached to each forearm. For example, it can be set to 5 cm or more and 15 cm or less to accommodate the case where the first arm 10 is placed below the front forearm and the second arm 20 is placed below the rear forearm. Also, for example, within 30 cm, this can accommodate a case where the first arm 10 is disposed below the front forearm and the second arm 20 is disposed above the back forearm. In Fig. 3, the left forearm and wrist are positioned between the first arm 10 and the second arm 20, which are disposed in upper and lower positions.

[0039] The first connecting part 12 or the second connecting part 22 can arrange and connect the first arm 10 and the second arm 20 at the same height on the Z axis. For example, the first connecting part 12 and the second connecting part 22 in FIG. 12 arrange and connect the first arm 10 and the second arm 20 at the same height on the Z axis. The first connecting part 12 or the second connecting part 22 in FIG. 12 connects the first arm 10 and the second arm 20 so that they can rotate around the bat body 30 (Z axis), move up and down and left and right, and tilt up and down and left and right. In the figure, the second connecting part 22 that arranges and connects the second arm 20 is arranged on the opposite side to the position where the first connecting part 12 connects and arranges the first arm 10, and they are connected so that they can rotate and tilt up and down and left and right at each connecting position, making it possible to arrange the first arm 10 in a first direction and the second arm in a second direction. However, without being limited thereto, for example, the first arm 10 or the second arm 20 can be connected and arranged at a position different from that shown in the figure. In addition, the first connecting part 12 can connect the first arm 10 so that it can rotate around the first direction (X-axis) and tilt up, down, left and right, and the second connecting part 22 can connect the second arm 20 so that it can rotate around the second direction (Y-axis) and tilt up, down, left and right. The first arm 10 and the second arm 20 are arranged at the same height on the Z-axis, the first arm 10 is arranged above the front forearm and the second arm 20 is arranged below the rear forearm, and each of them contacts, supports, and supports the respective forearms. In the case of a left-handed batter, it can be used by flipping it upside down, or by rotating the first arm 10 or the second arm 20 to change its position. Furthermore, the first connecting portion 12 or the second connecting portion 22 allows the first arm 10 and the second arm 20 to be rotated and arranged in a vertically or horizontally stacked position, thereby making the storage space compact.

[0040] Batting form is not a simple movement of both arms. Batting form is a complex movement involving many elements such as both arms, forearms, wrists, chest, trunk axis, upper body, waist, and lower body, which are intricately combined and linked, and which further includes rotational movement in addition to forward and backward movement. Only when these elements are smoothly and appropriately linked can an efficient batting form be formed. The swing trajectory of the bat is also a complex trajectory in which three movements are linked: not only the rotational movement of the head at the tip of the bat body 30, which is centered on the grip end 31a, that draws an arc, but also the forward movement of the bat body 30 (grip end 31a) moving toward the pitcher, and the twisting rotational movement in the axial direction of the bat body 30 (rolling due to the return of the bat). Therefore, it is difficult to master an efficient batting form by simply repeating practice swings without a concrete image, goal, or indicator of the batting form and swing trajectory. The same is true even when actual batting practice is repeated, and getting used to hitting does not necessarily lead to mastering an efficient batting form. Also, strengthening the muscles used in swinging a heavier bat for practice swings does not lead to mastering an efficient batting form. The reality is that it takes a long time for a batter to improve his batting and master an efficient batting form that suits him. In real batting, the batter must also look at the ball thrown by the pitcher, judge the ball's speed, course, height, and type, and time it so that the ball hits the center of the bat, which requires instantaneous recognition and response.

[0041] When a coach teaches a batter a batting form, if the batter is in a stationary state such as a stance, it is possible to take the batter's hands and guide the batter's arms, wrists, elbows, etc. to the appropriate position and posture by taking the time to hold them, but it is not easy to master an efficient batting form by teaching only in a stationary state. This is because the form differs depending on the stage of the swing. Also, a swing is not a stationary state, but involves the movement of the whole body such as the arms and waist, and is not a simple movement of only the arms, but is a complex movement in which a rotational movement is combined with a forward movement and is linked, and when going from a stationary state to a moving state, the situation changes completely during the swing process, and it is not possible to swing while maintaining the form taught in a stationary state. In the batting form training device 100, the first arm 10 and the second arm 20 can guide each forearm to a predetermined position and posture. The position and posture of each forearm are determined simply by determining the position of the grip part 31 (wrist) and the direction of the bat body 30 (third direction). The angle of each wrist is also determined. The first arm 10 and the second arm 20 arranged at a predetermined relative position can be guided to a predetermined position and posture while maintaining the relative position of each forearm. A triangle can be formed between the grip part 31 (wrist) and each forearm. Even when the swing is started and the arms start to move, the relative positions of the first arm 10 and the second arm 20 are maintained as in the stationary state, and the approach swing from the stance to the impact can be easily performed while maintaining the triangle between the grip part 31 (wrist) and each forearm. The first arm 10 and the second arm 20 are auxiliary tools for guiding the position and posture of each forearm, and there is a reference for the support posture and relative position of each forearm, so that the movement of the arms including each forearm, the movement of the upper body, lower body, and waist can be easily linked. This is because the first arm 10 and the second arm 20 guide the position and posture of each forearm and maintain the relative position, thereby simplifying the complex elements of the batting form. The batting form training device 100 has a very simple structure with a first arm 10 and a second arm 20, and yet allows the batter to practice an efficient batting form stance and approach without spending a lot of time just by taking a stance. By tracing and repeating an efficient batting form, the batter can master it. This shortens the time required to master an efficient batting form.In addition, the batting form training device 100 can be used to correct bad habits and to check or adjust when a batter is not in good form. The batting form training device 100 can be used by individual batters for individual practice of swing and form, and can also be useful for instructors when providing instruction.

[0042] The stance is the starting position of the swing and is the premise of an efficient batting form. The stance determines and affects the movement and linkage of the arms and body, and affects the origin of the bat, the swing trajectory, and stability. For example, a cramped, unnatural stance, or a stance with shoulders tense can easily lead to the bat taking a long detour, being difficult to swing, a forced swing, a narrow meet zone and power zone, etc., which can result in difficulty in getting the timing right, a narrow batting range, etc., and it is difficult to swing with an efficient batting form. The batting form training device 100 can determine the position and posture of the wrist and each forearm by having the first arm 10 and the second arm 20 fixed at a certain opening angle (θ) come into contact with and affixed to each forearm. The triangle of each forearm (arm) can be maintained without changing depending on the position of the grip part 31, and each forearm (arm) can be urged to a predetermined position, posture, and relative position. For example, when the angle (θ) is 90 degrees, each forearm can form a right triangle in front of the chest. By arranging the grip portion 31 held by both hands in the stance position, the shape of the triangle is not changed according to the position of the grip portion 31 (wrist), and each forearm and both arms are moved to a predetermined position, posture, and relative position, and the stance is determined. For example, by using the batting form training tool 100 and arranging the position of the grip portion 31, for example, slightly behind the catcher side (FIG. 3), and determining the third direction of the bat body 30, it is possible to easily create a stance (FIG. 4) in which the wrist and each forearm (arm) form a triangle. The stance can also be fine-tuned up and down, left and right, front and back, etc. to a shape and position that suits the batter. The first arm 10 and the second arm 20 contact, support, and support each forearm, making it possible to create a stance in a relaxed, natural posture without putting force on the shoulders. The batting form training tool 100 makes it easy to create the following stances, specifically, by guiding each forearm to a predetermined position and posture and maintaining the relative position with the first arm 10 extending in a first direction and the second arm 20 extending in a second direction. For example, it becomes easy to take a stance with the grip end 31a at a high position. This stance can increase the swing speed by using potential energy from a high position to gain momentum. For example, it becomes easy to take a stance at a position close to the top.This stance allows the batter to approach the ball in the shortest distance, giving the batter more time to assess the ball and expanding his range of response.

[0043] For example, it becomes easy to assume a stance with both sides open (opening the sides of the rear arm, so-called flying elbow) (FIGS. 3, 5A, 7A). The angle (θ) between the first direction and the second direction of the batting form training device 100 is a predetermined angle (for example, 90 degrees), so that the opening degree of the first arm 10 and the second arm 20 is determined, and the position, posture, and relative position of each forearm are determined by being attached to and supported by the first arm 10 and the second arm 20. For example, a batter can easily assume a flying elbow stance by determining the position and posture of the front forearm, the position of the grip end 31a, etc. When the batter goes from the stance to swinging, the first arm 10 and the second arm guide each forearm to the predetermined position, posture, and relative position, so that the batter can enjoy the advantages of the flying elbow stance. For example, this stance allows for smooth movement by avoiding a cramped swing with the armpit (right armpit) of the catcher's back arm closed, and makes it easier to bring the elbow of the catcher's back arm (right elbow) closer to the body. The body is rotated with a swing motion toward impact, and the right arm accelerates and the swing speed is increased by closing the right armpit and sliding the right elbow in front of the abdomen at once. In addition, a certain amount of space is also created in the armpit (left armpit) of the pitcher's arm, which does not hinder the progress of the right arm and right elbow on the back side, making it easier to pull out the bat, to hit the ball with the center of the bat, and to deal with inside balls that are usually difficult to deal with. In addition, this stance with the first arm 10 and the second arm 20 allows the forearms to form a triangle in front of the chest without tension in the shoulders and arms, allowing for a smooth transition to an approach. The movement of the right arm from this stance is an inside-out swing. That is, by starting the swing from the top (Fig. 5A), sliding the right elbow in front of the abdomen close to the body while tightening the right side (Fig. 5B), passing while leading with the grip end 31a side, and extending the arm toward the center, rotating the hips and accelerating the bat to move forward (Fig. 5C), and pushing the ball with impact (Figs. 5D-5E), a strong hit ball can be hit. Creating a wall on the pitcher's side (left side) can also prevent the body from opening up too quickly, and can prevent the wrist from turning back through impact, making it easier to transmit the force of the bat to the ball.

[0044] The batting form training device 100, with the first arm 10 extending in a first direction and the second arm 20 extending in a second direction, guides each forearm to a predetermined position and posture even during the swing motion, and maintains the relative position, so that it is easy to form a batting form from the following stance to approach. The batting form training device 100 makes it possible to approach toward the impact without changing the shape of the arms from the stance (e.g., Figs. 5A and 7A) (e.g., Figs. 5B-5D, 7B-7C). The first arm 10 and the second arm 20 are fixed at a constant opening angle (θ) and are attached to each forearm while maintaining their relative positions, so that the position, posture, and relative position of the wrist and each forearm can be determined, and the approach can be made without changing the (approximate) triangle formed by the wrist and each forearm (arm). In addition, the first arm 10 and the second arm 20, which are fixed at a certain opening angle (θ), are attached to each forearm and guide them to a specified position and posture, which can correct bad habits, inefficient swings, and body movements. By starting the swing from a proper starting stance, the swing can be smoothly started and an efficient batting form can be achieved. Even if the height and course of the ball change, the first arm 10 and the second arm 20 guide each forearm to a specified position and posture, and the relative positions are maintained, so an equally efficient batting form can be achieved.

[0045] The batting form training tool 100 allows the first arm 10 and the second arm 20 to guide each forearm to a predetermined position and posture and maintain the relative position, specifically making it easier to swing as follows. For example, the bat can be swung in a form suitable for a level swing. For example, it can be made easier to swing inside-out. For example, it can be made easier to swing with a wider meet zone. It can be made easier to swing with the bat, which can easily transmit the swing force of the bat to the ball by widening the power zone where the force to push the ball at impact can be made wider. It can be made easier to swing with smooth body movement and linkage. It can be made easier to swing in a way that easily avoids the adverse effects of a down swing or an upper swing. It can also be made easier to swing with a deep heart, which can easily deal with the difference in speed and timing of the ball. These swings are interrelated, and an efficient batting form can realize these swings. In this disclosure, the level swing, down swing, and upper swing are all based on the line of both shoulders, not on the ground. A level swing is not a swing on a horizontal plane with respect to the ground, but a swing in which the bat's trajectory is parallel to the line of both shoulders. A downswing is a swing below the line of both shoulders, and an upper swing is a swing above the line of both shoulders.

[0046] FIG. 8 shows the trajectory of the ball. Even if it is a fastball, gravity causes it to drop to some extent when it passes through the home base. In the case of a down swing, the bat enters the trajectory of the ball from an upward diagonal angle, so the meeting point where the center of the bat catches the ball is the intersection point of the trajectory of the bat and the trajectory of the ball, and the meeting zone becomes narrow. In addition, this swing has the disadvantage that the bat is likely to enter under the ball, making it easy to get a pop fly. In the case of an upper swing, the bat enters the trajectory of the ball from an upward diagonal angle, so like the down swing, the meeting point is the intersection point of the trajectory of the bat and the trajectory of the ball, and is narrow. In contrast, the batting form training tool 100 allows the bat to be swung in a form suitable for a level swing. A level swing allows the trajectory of the bat to match the trajectory of the ball, making it possible to swing close to the trajectory of the ball and to swing with a wide range that passes through the trajectory of the ball, and the width of the meeting point becomes longer, and the meeting point becomes linear, making the meeting zone wider (FIG. 8). In addition, by getting the bat into the ball's trajectory, it becomes easier to hit the ball at a wide angle and also makes it easier to respond to differences in the speed of the ball.

[0047] Furthermore, by swinging from inside out as shown in Fig. 10, the center 33 of the bat body 30 is linearly inserted into the trajectory of the ball, i.e., the trajectory of the center 33 of the bat body 30 can be aligned with the trajectory of the ball, the front-rear width of the meeting point is longer, the meeting point is linear, the meeting zone can be widened, and the ball can be easily caught by the center 33 of the bat body 30. Then, by passing close to the body while tightening the armpit (right armpit) of the back arm, and pushing out while extending the right elbow toward the center while rotating the waist, the bat can be accelerated to make impact, the ball can be pushed in, and a strong hit can be hit at a wide angle, and it is also easy to respond to the difference in speed of the ball. In the case of Fig. 10, for example, if the impact is made at the originally planned meeting point (in front of the center), the ball can be pushed toward the center and a strong hit can be hit, and even if the timing is a little late and the impact is made on the front side (catcher side), the ball can be pushed toward the right, and even if the timing is a little early and the impact is made on the back side (pitcher side), the ball can be pushed toward the left and a strong hit can be hit. In the case of an upper swing (FIG. 9), a down swing, or an outside-in so-called door swing (FIG. 11), the bat enters the ball's trajectory at a point (only at the intersection), the meeting zone is narrow, and it is difficult to transmit the swing force to the ball at the time of impact. In contrast, in the case of a level swing or inside-out swing, the bat enters the ball's trajectory in a line, so the trajectory of the ball and the trajectory of the swing match, and the bat hits the ball head-on, so the force can be transmitted to the ball without loss, making it easier to transmit the force at the time of impact and increasing the impact force. In a level swing, the swing is almost parallel to the line of both shoulders, so the bat body 30 moves perpendicular to the axis of the trunk, making it easier to apply force at the time of impact and allowing the ball to be pushed in. In addition, in an inside-out swing, the grip part 31 of the bat body 30 precedes the tip part on the head side, and the right elbow passes near the body as if wrapped around the body, accelerating the bat body 30 toward the impact, and the process of pushing the bat body 30 toward the center (FIGS. 5C-5D) slows down the wrist turn, allowing the ball to be pushed in even after impact. It also helps prevent the bat from getting under the ball during the downswing, which can easily result in a pop fly.Furthermore, there is no need to set an unreasonable angle to the bat trajectory for the body rotation movement such as down swing and upper swing, and it is easy to smoothly link the arms and upper body with the waist and lower body, and the bat trajectory can be made approximately perpendicular to the trunk axis, which makes it easy to apply force. It is also possible to avoid the disadvantages of down swing and upper swing, where the bat trajectory is angled with respect to the upper body and tends to result in a hand-hitting swing where only the upper body is swung. In addition, the batting form training device 100 corrects the cramped movement and unnatural arm movement caused by excessively focusing on inside-out swing, which is caused by tightening the armpit of the back arm too much, to the specified position, posture, and relative position of the first arm 10 and the second arm 20, and can promote smooth movement and linkage with rotation.

[0048] Furthermore, the batting form training device 100 allows the forearms of both arms to move away from the first arm 10 and the second arm 20 in an appropriate position and range, and not to maintain the initial state of being in contact with each other, thereby enabling the user to hit a ball with greater strength. In Figs. 5A to 5E, the first direction of the first arm 10, the left forearm supported by the first arm 10, the second direction of the second arm 20, and the posture directions of the right forearm supported by the second arm 20 are shown by dashed lines. For example, at the stage where a swing starts from the stance toward the meet zone, the left forearm is supported by the first arm 10, and the right forearm is supported by the second arm 20 (Figs. 5A to 5B). Before and after entering the meet zone, the catcher's right forearm leaves the second arm 20 (FIGS. 5C-5E), and before and after the impact by pushing the bat body 10 toward the center, the pitcher's left forearm leaves the first arm 10 (FIGS. 5D-5E), which allows the bat body 30 to accelerate toward the impact, pushing the bat body 30 (core 33) to push out the impacted ball, and the swing speed and swing power can be transmitted to the ball more. In the comparative example shown in FIG. 6B and subsequent figures, the forearms leave the first arm 10 and the second arm 20 earlier than the appropriate range, resulting in an outside-in swing (so-called door swing) in which the tip of the bat body 30 rotates from the outside. In this swing, the tip of the bat makes a long detour, so the swing speed cannot be efficiently increased, the body opens up quickly, and it is difficult to link with the rotation of the hips, so it is easy to hit with the hand, and the ball cannot be caught in the shortest time. In addition, the center 33 of the bat body 30 enters the trajectory of the ball only at a point, and the contact zone is narrow (FIG. 11), making it difficult to hit a strong ball. (Embodiment 2)

[0049] 13 shows a batting form training tool 200 according to embodiment 2. Batting form training tool 200 includes a first arm 10 connected to bat body 30 via a first connecting part 11, and a second arm 20 connected to bat body 30 via a second connecting part 22.

[0050] The first arm 10 and the second arm 20 are the same as in the first embodiment. The batting form training tool 200 allows swing practice by connecting and fixing the first arm 10 and the second arm 20 to the bat body 30. The bat body 30 can also be the same as in the first embodiment, and the above description applies. The bat body 30 can be an actual bat, or it can be a bat dedicated to the batting form training tool 200. The first arm 10 and the second arm 20 can be freely detached from the bat body 30, or they can be made non-detachable to improve the connection strength. The first connecting part 11 and the second connecting part 22 can be connected. [Industrial Applicability]

[0051] The batting form training device of the present disclosure has a simple structure and can be suitably used as a training tool that allows players to master an efficient batting form. [Explanation of symbols]

[0052] 100, 200... Batting form training equipment 10…First arm 11...Contact part 12...1st connection part 20…Second arm 21…Contact part 22…Second connection part 30…Bat body 31…Grip section 31a…Grip end 32...Ball hitting club 33…Core

Claims

1. A first arm for guiding one arm to a predetermined position; A second arm that guides the other arm to a predetermined position; Equipped with the first arm has a first connecting portion that connects the first arm extending in a first direction to a grip portion of a bat body, the second arm has a second connecting portion that connects the second arm extending in a second direction different from the first direction to the grip portion of the bat body; The batting form training tool includes a first arm and a second arm connected to the bat body, which come into contact with each forearm and guide each forearm to a predetermined position.

2. The batting form training device according to claim 1, A batting form training tool, wherein the first direction is perpendicular to the bat body.

3. The batting form training device according to claim 1, A batting form training tool, wherein the second direction is perpendicular to the bat body.

4. The batting form training device according to claim 1, A batting form training tool, wherein the bat body extends in a third direction parallel to the Z-axis, the first direction is parallel to the X-axis, and the second direction is parallel to the Y-axis.

5. The batting form training device according to any one of claims 1 to 4, A batting form training device, wherein either the first arm or the second arm, or both, are rotatably connected to the bat body.

6. The batting form training device according to claim 1, A batting form training device in which either the first arm or the second arm, or both, are detachably connected to the bat body.

7. The batting form training device according to claim 1, A batting form training tool in which the first arm and the second arm are disposed in upper and lower positions relative to the bat body.

8. The batting form training device according to claim 1, A batting form training tool, wherein the angle (θ) between the first direction and the second direction in a horizontal plane is greater than or equal to 60 degrees and less than or equal to 120 degrees.

9. The batting form training device according to claim 1, A batting form training device, wherein the first connecting portion is connected to the second connecting portion.

10. The batting form training device according to claim 1, The batting form training tool, wherein the first arm and the second arm are made of plastic.

11. The bat body, A first arm for guiding one arm to a predetermined position; A second arm that guides the other arm to a predetermined position; Equipped with the first arm has a first connecting portion that connects the first arm extending in a first direction to a grip portion of the bat body, the second arm has a second connecting portion that connects the second arm extending in a second direction different from the first direction to the grip portion of the bat body; The batting form training tool includes a first arm and a second arm connected to the bat body, which come into contact with each forearm and guide each forearm to a predetermined position.

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