JP2023120064A - Batting training apparatus - Google Patents

Abstract

To provide a batting training apparatus that enables efficient learning of correct motions of a lower half of body and a wrist in an inside-out swing.SOLUTION: A batting training apparatus 1 comprises a body 2 extending along a linear central axis from a base end part 2a to a tip 2b; a grip part 3 provided at the main body 2; and a batting part 4 provided at the main body 2. When viewed in a cross section taking the central axis as a normal line, an outer peripheral surface of the batting part 4 includes a winning region 41 and a failure region 42 that is a region differing from the winning region 41. A repulsion coefficient of the winning region 41 and a repulsion coefficient of the failure region 42 are different from each other.SELECTED DRAWING: Figure 1

Description

The present invention relates to a batting practice tool. More specifically, the present invention relates to a batting practice tool that enables efficient learning of an inside-out swing.

A so-called inside-out swing is known as one of the basic and ideal swings in baseball, tennis, and the like. An inside-out swing is a swing in which a hitting tool such as a bat or racket passes through the inside of the batter's body and goes around the outside.

When an inside-out swing is performed, the hitting tool flexes so that the head lags behind the grip at the start of the swing. The force causes the hitting tool to bend in such a way that the head moves forward from the grip (in the opposite direction to the one at the start of the swing). For this reason, the inside-out swing has the advantage that the elastic force and inertial force of the striking tool are applied to the ball, and the flight distance of the ball is increased. The inside-out swing also has the advantage of making it easier to catch the ball and improving the swing speed.

A conventional batting practice tool for learning inside-out is disclosed in, for example, Patent Document 1 below. Patent Document 1 below discloses a main body extending along a linear central axis from a proximal end to a distal end, the body including a grip provided near the proximal end, and a body that protrudes from the body and is used for hitting. A batting practice bat is disclosed that includes a hitting portion that includes a face. At least when the bat for batting practice hits the ball, the hitting surface extends linearly when viewed from a direction orthogonal to the central axis. The striking surface and the central axis on the base end side form an angle θ of 90 degrees or more and less than 180 degrees.

Japanese Patent Application Laid-Open No. 2020-5900

One of the key points for a correct inside-out swing is lower body and wrist movement. The correct lower body and wrist movement for the inside-out swing is to rotate the hips while keeping the elbows close to the body without turning the top hand wrists. If the lower body and wrists are correctly moved, the wrist of the top hand does not turn and the palm of the top hand faces upward until the ball hits the hitting implement. As a result, it is possible to prevent the head from protruding too far forward due to the quick turn of the wrist of the top hand, and it is possible to delay the timing at which the head reaches the ball.

However, conventionally, it has been difficult to efficiently learn the correct movements of the lower body and wrists in an inside-out swing. Even if a practicer understands the correct movement of the lower body and wrists in the inside-out swing, it is difficult to grasp whether or not the understanding is correctly reflected in the actual swing. Practitioners can also have their own swings seen by a coach and get advice from the coach. However, even in this case, it was difficult for the practicer to grasp whether or not the movements of the lower body and wrists in his/her own swing were correctly corrected by the instructor's advice.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and to provide a batting practice tool that enables efficient learning of the correct movements of the lower body and wrists in an inside-out swing.

A batting practice device according to one aspect of the present invention comprises a main body extending from a proximal end to a distal end along a linear central axis, a grip portion provided on the main body, and a hitting portion provided on the main body. and a hitting portion provided in a region closer to the tip side than the gripping portion along the central axis, and when viewed in a cross section normal to the central axis, the outer peripheral surface of the hitting portion is the first and a second region that is a region different from the first region, and the coefficient of restitution of the first region and the coefficient of restitution of the second region are different from each other.

In the above hitting practice tool, preferably, the material forming the first region and the material forming the second region are different from each other.

Preferably, the batting practice tool further comprises a mark provided on the main body, and the mark is provided at a point-symmetrical position with respect to the central position of the first region along the circumferential direction of the main body and the central axis.

In the above hitting practice tool, preferably, the circularity of the outer peripheral surface of the hitting portion is greater than 0 and equal to or less than 5 mm.

In the above hitting practice tool, preferably, the step at the boundary between the first region and the second region is greater than 0 and less than or equal to 1 mm.

In the hitting practice tool, preferably, when viewed in a cross section normal to the central axis, the ratio of the first region to the entire outer peripheral surface of the hitting portion is 1/5 or more and 1/2 or less.

According to the present invention, it is possible to provide a batting practice tool that enables efficient learning of correct movements of the lower body and wrists in an inside-out swing.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of the batting practice tool 1 in one embodiment of this invention. FIG. 1(a) is a cross-sectional view taken along line II-II in FIG. Fig. 1(a) is a cross-sectional view taken along line III-III in Fig. 1(a); FIG. 4 is a diagram schematically showing first, second, and third stages of movement when a practice person UR practices using the batting practice device 1 in one embodiment of the present invention. FIG. 10 is a diagram schematically showing a fourth stage of movement when a practice person UR practices using the batting practice device 1 in one embodiment of the present invention. It is a sectional view showing composition of batting training implement 1 in the 1st modification of the present invention. It is a sectional view showing composition of batting training implement 1 in the 2nd modification of the present invention. It is a figure which shows the structure of the batting practice tool 1 in the 3rd modification of this invention.

An embodiment of the present invention will be described below with reference to the drawings.

[Structure of batting practice tool]

FIG. 1 is a diagram showing the configuration of a batting practice tool 1 according to an embodiment of the present invention. FIG. 1A is a plan view (viewed from the contact area 41 side). FIG. 1(b) is a bottom view (viewed from the side of the missing region 42). FIG. 2 is a cross-sectional view taken along line II--II in FIG. 1(a). Although the mark 6 is not visible in the cross section of FIG. 2, the position of the mark 6 is shown in FIG. 2 for convenience of explanation.

1 and 2, a batting practice tool 1 (an example of a batting practice tool) according to the present embodiment includes a main body 2 (an example of the main body) and a grip 3 (an example of the grip). , a hitting portion 4 (an example of a hitting portion), a connecting portion 5, and a mark 6 (an example of a mark).

The main body 2 has a rod-like shape similar to a bat used in baseball. The main body 2 includes a base end portion 2a (an example of the base end portion) and a tip portion (head) 2b (an example of the tip portion). The main body 2 extends from the proximal end 2a to the distal end 2b along the linear central axis AX (FIG. 3).

The grip portion 3 is a portion that is gripped by the practitioner, and is provided near the base end portion 2 a of the main body 2 . A non-slip tape may be wound around the grip portion 3 . The outer peripheral surface of the grip portion 3 has a substantially circular shape when viewed in a cross section perpendicular to the central axis AX. The cross-sectional diameter of the gripping portion 3 is minimal at a predetermined position in the gripping portion 3 in the direction along the central axis AX. has increased to

The hitting part 4 is a part for hitting a ball. The hitting part 4 is provided near the tip part 2b of the main body 2. As shown in FIG. The hitting portion 4 is provided in a region closer to the tip portion 2b than the grip portion 3 along the central axis AX.

The outer peripheral surface 4a of the striking portion 4 has a substantially circular shape when viewed in a cross section (FIG. 2) orthogonal to the central axis AX. The circularity of the outer peripheral surface 4a of the striking portion 4 is preferably greater than 0 and equal to or less than 5 mm. As a result, the shape of the hitting part 4 becomes a shape close to that of a baseball bat. A practicer can hit a ball with a feeling similar to that of a baseball bat.

The roundness of the outer peripheral surface 4a of the hitting portion 4 is measured, for example, by the following method. Eight points are taken on the outer peripheral surface 4a of the striking portion 4 at equal intervals along the circumferential direction around the central axis AX. The eight points are divided into four sets of two points facing each other across the central axis AX. A micrometer is used to measure the distance between two points in each of the four sets. A value obtained by dividing the difference between the maximum value and the minimum value of the distance between two points obtained in each of the four sets by 2 is taken as the roundness.

The connecting portion 5 connects the grip portion 3 and the hitting portion 4 . The connecting portion 5 has a substantially circular shape when viewed in a cross section perpendicular to the central axis AX. The cross-sectional diameter of the connecting portion 5 increases with increasing distance from the proximal end portion 2a (toward the distal end portion 2b).

A mark 6 is provided on the main body 2 . The mark 6 is provided, for example, in a region closer to the tip portion 2b than the striking portion 4 is. The mark 6 serves as a mark for gripping the batting practice tool 1 in a correct state. The mark 6 may be any member attached to the main body 2, a symbol drawn in a color different from that of the outer peripheral surface of the main body 2, or a recess provided on the outer peripheral surface of the main body 2. Alternatively, it consists of a convex portion or the like.

Here, the outer peripheral surface 4a of the striking portion 4 will be described in detail. When viewed in a cross section (the cross section in FIG. 2) normal to the central axis AX, the outer peripheral surface 4a of the hitting portion 4 includes a hit region 41 (an example of a first region) and a miss region 42 (second region). example) and The hitting area 41 is an area where the ball hits when the practicer performs correct movements of the lower body and wrists in the swing. The lost area 42 is an area where the ball hits when the practitioner makes an incorrect movement of the lower body and wrist during the swing. The hit area 41 and the hit area 42 are different areas that do not overlap. It is preferable that the outer peripheral surface 4a of the hitting portion 4 does not include areas other than the hit area 41 and the hit area 42, and consists of the hit area 41 and the hit area 42 only.

When viewed in a cross section normal to the central axis AX (the cross section in FIG. 2), the ratio of the hit area 41 to the entire outer peripheral surface 4a of the striking part 4 is 1/5 or more and 1/2 or less. is preferred. When the hit area 41 has a ratio of 1/5 or more, it is possible to secure the hit area 41 having an appropriate size for hitting the ball. On the other hand, since the hit region 41 has a ratio of 1/2 or less, it is possible to avoid a situation in which the ball hits the hit region 41 even if the practicer makes an erroneous movement of the lower body and wrist during the swing. can.

The material forming the hit region 41 and the material forming the reject region 42 are different from each other. As a result, the coefficient of restitution of the hit area 41 and the coefficient of restitution of the failure area 42 are different from each other. It is preferable that each of the hit area 41 and the unsuccessful area 42 is visually distinguished by a method such as being colored with a different color from each other.

The coefficient of restitution of the outer peripheral surface 4a of the striking part 4 is measured by the following method using, for example, a microsphere repulsion tester "eNM3A10" (manufactured by Nakai Seiki Seisakusho). A single alumina ball indenter with a diameter of 3 mm is projected toward an arbitrary reflecting position on the outer peripheral surface 4a of the striking part 4 at an initial velocity Vi of 10 m/s. The rebound velocity Vr of the ball indenter from the reflection position is measured. The ratio (Vr/Vi) of the rebound velocity Vr to the initial velocity Vi is defined as the coefficient of restitution at the reflection position on the outer peripheral surface 4a of the striking portion 4. FIG.

The material forming the hit region 41 and the material forming the reject region 42 are different from each other. The hit region 41 is made of a material 91 such as wood such as white ash, rhododendron, ash, maple, bamboo, or yachida, an alloy containing aluminum, copper, zinc, or the like, plastic, or carbon fiber. Material 91 is a material with a relatively high coefficient of restitution. The lost area 42 is made of a material 92 such as rubber or resin. Material 92 is a material with a relatively low coefficient of restitution. The coefficient of restitution of material 92 is lower than that of material 91 . In this case, the gripping portion 3 and the connecting portion 5 may also consist of the material 91 .

A step 43 at the boundary between the hit region 41 and the hit region 42 is preferably greater than 0 and equal to or less than 1 mm. In FIG. 2 , the hit area 42 protrudes radially more than the hit area 41 , but the hit area 41 may protrude more radially than the hit area 42 . Since the step 43 is 1 mm or less, it is possible to prevent the ball from flying in an unexpected direction when the ball hits the step 43 .

The surface conditions of the hit region 41 and the peeling region 42 are made to be different from each other, and the material forming the base of the hit region 41 and the material forming the base of the peeling region 42 are made different from each other. For example, the coefficient of restitution of the hit region 41 and the coefficient of restitution of the loss region 42 may be made different from each other. As a method for making the surface states of the hit region 41 and the peeled region 42 different from each other, for example, only one of the hit region 41 and the peeled region 42 is provided with fine unevenness. At least the coefficient of restitution of the hit region 41 and the coefficient of restitution of the rejection region 42 should be different from each other, and the material forming the hit region 41 and the material forming the rejection region 42 may be the same.

The center position of the hit region 41 along the circumferential direction of the main body 2 when viewed in a cross section (the cross section in FIG. 2) normal to the central axis AX is defined as a center position CT. The mark 6 is provided at a position PO that is symmetrical with respect to the central position CT and the central axis AX. The mark 6 may be provided at the position PO, and the position of the mark 6 along the central axis AX is arbitrary. The mark 6 may be provided on the proximal end portion 2a, the distal end portion 2b, the grip portion 3, the striking portion 4, the connecting portion 5, or the like.

FIG. 3 is a cross-sectional view taken along line III--III in FIG. 1(a).

1-3, the body 2 is a hollow material and further includes a hole 21 and a hollow portion 22. As shown in FIG. The hole 21 is formed at a position corresponding to the missing region 42 and reaches the hollow portion 22 . A material 92 forming the missing region 42 is embedded in the hollow portion 22 through the hole 21 . The material 92 forming the missing region 42 is fixed to a portion of the material 91 forming the hit region 41 facing the hollow portion 22 by a method such as adhesion. The body 2 may be a solid material instead of a hollow material.

[How to use bat for batting practice]

FIG. 4 is a diagram schematically showing the first, second, and third stages of movement when the practice person UR practices using the batting practice device 1 in one embodiment of the present invention. 4(a) is the first stage, FIG. 4(b) is the second stage, and FIG. 4(c) is the third stage.

Referring to FIG. 4(a), first, the practice person UR holds the grip portion 3 of the batting practice tool 1 with both hands at the widthwise central portion of the body. A position PO in the circumferential direction of the main body 2 including the mark 6 is directed upward. Furthermore, the batting practice tool 1 is held so that the position PO is between the base of the thumb and the base of the index finger of the top hand of the practice person UR. This holding state is maintained until the swing ends.

Referring to FIG. 4(b), next, the practice person UR prepares the batting practice tool 1. As shown in FIG. The practicer UR opens his/her feet to about shoulder width, faces toward the ball (front side), and lifts both hands holding the batting training tool 1 to near the shoulders on the top hand side (rear side). The mark 6 faces the back side of the trainee UR.

Referring to FIG. 4(c), next, the practice person UR swings. After moving the grip part 3 to the top, the base end part 2a passes through the position of the center of the person's body in the shortest distance, and then the tip part 2b lags behind the grip part 3 and reaches the position of the person's body. The batting training tool 1 is moved so as to pass through the center position of , and the ball BL is hit.

The ball BL hit by the practicer UR may be thrown by a pitcher, lightly tossed by an assistant near the practicer UR, or placed on a tee. It may have been done.

FIG. 5 is a diagram schematically showing the fourth stage of movement when the practice person UR practices using the batting practice device 1 in one embodiment of the present invention. FIG. 5(a) shows the correct movement of the lower body and wrists in an inside-out swing. FIG. 5(b) shows a case in which the lower body and wrist are incorrectly moved in an inside-out swing.

Referring to FIG. 5( a ), when the practicer UR correctly moves the lower body and the wrist in the inside-out swing, the wrist of the top hand does not turn until just before the ball collides with the batting training equipment 1 . The palm of the top hand faces upwards. At this time, the top hand between the base of the thumb and the base of the forefinger faces backward. The mark 6 faces the rear side, and the contact area 41 faces the front side. As a result, the ball BL is hit in the hit area 41 . Since the coefficient of restitution of the hit region 41 is larger than the coefficient of restitution of the lost region 42, the flight distance of the ball BL hit by the hit region 41 is relatively large.

On the other hand, referring to FIG. 5(b), when the practice person UR makes a wrong movement of the lower body and the wrist, the wrist of the top hand returns sooner, so the ball hits the batting training tool 1 immediately before the ball hits. , the palm of the top hand faces forward. At this time, the top hand between the base of the thumb and the base of the index finger faces upward. The mark 6 faces upward, and the lost area 42 faces forward. As a result, the ball BL is hit in the lost area 42 . Since the coefficient of restitution of the lost region 42 is smaller than the coefficient of restitution of the hit region 41, the flight distance of the ball BL hit in the lost region 42 becomes relatively small.

[Effects of Embodiment]

According to the above-described embodiment, the practicer hits the ball using the batting training equipment, and determines whether he or she has performed the correct movements of the lower body and wrists in the inside-out swing based on the flight distance of the ball. can be confirmed. As a result, the correct movements of the lower body and wrists in the inside-out swing can be efficiently mastered.

In addition, when the materials that make up the hitting area and the materials that make up the losing area are different from each other, the practicer can determine the inside-out based on the feel of hitting the ball (hitting sound, impact received at the time of hitting, etc.). It is possible to sensuously confirm whether or not the lower body and wrists have moved correctly in the swing.

[Modification]

Next, a modification of the above-described embodiment will be described.

FIG. 6 is a cross-sectional view showing the configuration of a batting practice tool 1 according to a first modified example of the present invention. FIG. 7 is a cross-sectional view showing the configuration of a batting practice tool 1 according to a second modification of the present invention. FIG. 8 is a diagram showing the configuration of a batting practice tool 1 according to a third modified example of the present invention. FIG. 8A is a plan view (viewed from the contact area 41 side). FIG. 8(b) is a bottom view (viewed from the side of the lost region 42).

Referring to FIG. 6, in the first modified example, main body 2 further includes groove 23 formed at a position corresponding to non-existent region 42 . Inside the groove 23, a material 92 forming the missing region 42 is fixed by a method such as adhesion.

With reference to FIG. 7 , in a second modification, the body 2 includes a striking portion main body 24 provided in the striking portion 4 . The hitting portion main body 24 has a substantially circular shape when viewed in a cross section perpendicular to the central axis AX. The hitting portion main body 24 is made of the material 91 that forms the hit region 41 . The striking portion main body 24 is not provided with grooves or holes. A material 92 forming the non-removable region 42 is fixed by a method such as adhesion at a position corresponding to the non-removable region 42 on the outer peripheral surface of the hitting portion main body 24 . As a result, the area where the material 92 is fixed on the outer peripheral surface of the striking part main body 24 becomes the missing area 42 , and the area where the material 92 is not fixed on the outer peripheral surface of the striking part main body 24 becomes the hit area 41 .

Further, referring to FIG. 8, in the third modification, the hit region 41 is made of a material 92 having a low coefficient of restitution, and the lost region 42 is made of a material 91 having a high coefficient of restitution. In this case, the flight distance of the ball when the practicer UR makes correct movements of the lower body and wrists is smaller than the flight distance of the ball when the practicer UR makes incorrect movements of the lower body and wrists. Become.

In addition, the configuration of the hitting practice tool 1 other than that described in each of the modifications described above is the same as the configuration of the hitting practice tool in the above-described embodiment. For this reason, the same members are denoted by the same reference numerals, and the description thereof will not be repeated.

[others]

A portion of the main body 2 other than the striking portion 4 may be made of the same material as the material forming the bleed region 42, or may be made of the same material as the material forming the hit region 41. , may be made of a material different from the material forming the hit region 41 and the material forming the non-contact region 42 .

The batting practice tool 1 in the embodiment and modification described above may be used for batting practice in sports other than baseball (for example, tennis, badminton, or table tennis).

The above embodiments and modifications can be combined as appropriate.

The above-described embodiments and modifications should be considered illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the scope and meaning of equivalents of the scope of the claims.

1 batting practice equipment (an example of batting practice equipment)
2 Main body (an example of a main body)
2a Base end of main body (an example of base end)
2b Tip of body (example of tip)
3 gripping part (an example of a gripping part)
4 striking part (an example of striking part)
4a Outer peripheral surface of striking part 5 Connecting part 6 Mark (an example of mark)
21 hole of main body 22 hollow part of main body 23 groove of main body 24 hitting part main body of main body 41 contact area of hitting part (an example of the first area)
42 Missing area of hitting part (an example of second area)
43 Step between hit area and failure area 91 Material with relatively high coefficient of restitution 92 Material with relatively low coefficient of restitution AX Central axis BL Ball CT Center position of hit region along the circumferential direction of the main body PO Center position CT and Position symmetrical about the central axis

A batting practice tool according to one aspect of the present invention is a batting practice tool that allows an inside-out swing to be learned efficiently, and extends from a proximal end to a distal end along a linear central axis. a main body; a gripping portion provided in the main body; and a hitting portion provided in the main body, the hitting portion being provided in a region closer to the tip side than the gripping portion along the central axis. , when viewed in a cross section normal to the central axis, the outer peripheral surface of the hitting portion includes a first region and a second region that is different from the first region. The coefficient of restitution of the region and the coefficient of restitution of the second region are different from each other, further comprising a mark provided on the main body, the center position of the first region along the circumferential direction of the main body and the central axis The mark is provided at a position that is symmetrical with respect to the The hitting training device is held by both hands of the practitioner, and the position of the main body, including the mark, in the circumferential direction faces upward, and is between the base of the thumb and the base of the index finger of the top hand of the practitioner. A gripping state is established in which the position in the circumferential direction is reached, and the gripping state is maintained until the end of the swing .

Claims (6)

a body extending along a linear central axis from a proximal end to a distal end;
a grip provided on the main body;
a hitting portion provided in the main body, the hitting portion provided in a region closer to the distal end than the gripping portion along the central axis;
When viewed in a cross section normal to the central axis, the outer peripheral surface of the hitting portion includes a first region and a second region different from the first region,
A batting practice tool, wherein the coefficient of restitution of the first region and the coefficient of restitution of the second region are different from each other. 2. The hitting practice device according to claim 1, wherein a material forming said first region and a material forming said second region are different from each other. Further comprising a mark provided on the main body,
The hitting practice device according to claim 1 or 2, wherein the mark is provided at a point-symmetrical position with respect to the central position of the first region along the circumferential direction of the main body and the central axis. The hitting practice device according to any one of claims 1 to 3, wherein the roundness of the outer peripheral surface of the hitting portion is greater than 0 and equal to or less than 5 mm. The hitting practice device according to any one of claims 1 to 4, wherein the step at the boundary between the first area and the second area is greater than 0 and 1 mm or less. Claims 1 to 5, wherein when viewed in a cross section normal to the central axis, the first region accounts for 1/5 or more and 1/2 or less of the entire outer peripheral surface of the striking portion. The batting practice tool according to any one of .

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