JP6247339B2 - Ball hitting tool manufacturing method and measuring ball hitting tool used in the method - Google Patents

Description

  The present invention relates to a method for manufacturing a ball hitting tool such as a bat or a racket, and an invention of a ball hitting tool for measurement that can be used in the method.

  Ball hitting tools used in ball games such as bats and rackets are mostly off-the-shelf products that have been mass-produced. In order to hit the ball more strongly and farther using these off-the-shelf ball hitting tools, it is necessary to learn a swing adapted to the off-the-shelf product. For example, Patent Literature 1 discloses an exercise instrument for acquiring an optimum swing by attaching an acceleration sensor to a bat and measuring the maximum head speed when the bat is swung. Patent Document 2 discloses a practice instrument for learning an optimal swing by fixing a centrifugal force measuring device to a head part and converting the centrifugal force into a head speed.

JP 2001-129145 A Japanese Patent Laid-Open No. 2003-784

  However, the above-described practice device can acquire a swing suitable for a ready-made ball hitting tool for the purpose of increasing the strength and / or flying distance of the hit ball when using a ready-made ball hitting tool. It is a training instrument for the purpose. However, for a user, it is desirable to have a ball hitting tool that can obtain maximum strength and / or flight distance by a conventional swing based on the user's physical ability. There was no technology.

As a result of intensive studies to solve the above problems, the present inventor has found a method of manufacturing a ball hitting tool that provides the maximum strength and / or flight distance for the user. Moreover, the ball hitting tool for a measurement which can be used for this method was discovered.
That is, the present invention
[1] (1) A step of preparing a measuring ball striking tool having a function of changing a weight and a center of gravity and measuring a centrifugal force;
(2) a step of determining the weight and the center of gravity that provide the maximum centrifugal force by using the measurement ball hitting tool while the subject changes the weight and the center of gravity; and (3) based on the determined weight and center of gravity. Manufacturing the ball striking tool,
A method for manufacturing a ball striking tool,
[2] A ball striking instrument for measurement, which can be attached with a weight for changing the weight and the center of gravity, and has a strain sensor in a range of 20 to 50 cm from the grip end.
[3] A ball striking instrument for measurement according to [2], including a display unit for displaying a numerical value measured by a strain sensor,
[4] A ball striking instrument for measurement according to [2] or [3] selected from a bat, golf club, tennis racket, badminton racket, cricket bat and hockey stick, and [5] a spacer for adjusting the length A ball striking instrument for measurement according to any one of [2] to [4], which is a golf club that can be attached to a shaft.
About.

  According to the method of the present invention, it is possible to manufacture a ball hitting tool that provides the maximum strength and / or flight distance by an easy method by swinging according to the physical ability of the user. In addition, the measuring ball hitting tool of the present invention can determine the weight and the center of gravity of the ball hitting tool that are optimal for the user more accurately and easily. Therefore, by using the measuring ball hitting tool of the present invention, data necessary for manufacturing the ball hitting tool optimum for the user can be easily and accurately collected.

FIG. 1 shows a bat as an example of a ball striking instrument for measurement according to the present invention. (A) is an overall view, (b) is an overall view of a bat fitted with one weight, and (c) is a weight. Overall view of two bats fitted, (d) is a view of the weight from the side, (e) is a view of the weight from the front, (f) is a view showing variations of the weight 2A and 2B show a bat provided with a display unit, where FIG. 2A is an overall view and FIG. 2B is an enlarged view of the display unit. 3A and 3B show a bat different from FIG. 1 which is an example of the measuring ball striking tool of the present invention. FIG. 3A is an overall view, FIG. 3B is an overall view of a bat fitted with a weight, and FIG. Is the overall view of the bat with display FIG. 4 shows a golf club as an example of a measuring ball hitting tool according to the present invention. (A) is an overall view, (b) is an enlarged view of a ball hitting portion viewed from the side, and (c) is an upper view. (D) is an enlarged view of the ball striking portion with a weight, viewed from the side, (e) is a view of the weight from the side, and (f) is a view of the weight from the front. The figure which shows the aspect which changes the length of a golf club using a connection shaft, (g). FIG. 5 is a view showing a golf club provided with a display unit. FIG. 6 shows a racket as an example of a ball striking instrument for measurement according to the present invention. (A) is an overall view, (b) is an overall view of a weight rope, and (c) is a racket around which a weight rope is wound. Overall view FIG. 7 is a view showing a racket provided with a display unit. FIG. 8 shows a cricket bat as an example of a ball striking instrument for measurement according to the present invention, where (a) is an overall view, and (b) is an overall view of a cricket bat with a weight attached thereto. FIG. 9 shows a cricket bat provided with a display unit. FIG. 10 shows a hockey stick as an example of the measuring ball hitting tool of the present invention, where (a) is an overall view, and (b) is an overall view of a hockey stick with a weight attached thereto. FIG. 11 is an overall view of a hockey stick having a display unit.

DESCRIPTION OF SYMBOLS 1 Bat body 2 Ball hitting part 3 Grip part 31 Grip end 32 Screw 4 Strain sensor 5 Weight 51 Weight inner diameter 52 Weight thickness 53 Multiple weights 6 of different sizes Display part 61 Calculation part 62 Liquid crystal part 7 Connection part 8 Golf Club body 9 Shaft 91 Screw hole 10 Bolt 11 Cavity 12 Nut 13 Connection shaft 131 Screw hole 132 Screw 14 Racket body 15 Weight rope 16 Cricket bat body 17 Hockey stick body

Ball hitting tool manufacturing method The ball hitting tool manufacturing method of the present invention comprises:
(1) A step of preparing a measuring ball striking tool having a function of changing the weight and the center of gravity and measuring a centrifugal force (first step),
(2) a step in which the subject uses the measuring ball striking tool while changing the weight and the center of gravity to determine the weight and the center of gravity that provide the maximum centrifugal force (second step); and (3) the determined weight And a step of manufacturing a ball hitting tool based on the center of gravity (third step),
Consists of.

First Step The first step is a step of preparing a measuring ball striking tool having a function capable of changing the weight and the center of gravity and measuring the centrifugal force. Here, the “ball hitting tool” in the present invention means a tool used to hit a ball in a ball game. Specific examples of the ball hitting tool in the present invention include a bat, a golf club, a tennis racket, a badminton racket, a cricket bat and a hockey stick. As a specific example of the “ball hitting tool for measurement”, there is a ball hitting tool that can attach a weight to an arbitrary place and includes a sensor for measuring centrifugal force, such as a load cell. As a more specific “measuring ball hitting tool”, for example, a measuring ball hitting tool as described later can be used.

Second Step The second step is a step in which the subject determines the weight and the center of gravity that cause the maximum centrifugal force by using the measuring ball hitting tool while changing the weight and the center of gravity. In order to obtain a stronger hit ball, the impact force applied to the ball of the ball hitting tool must be strong. The impact force can be obtained by the formula of (ball hitting tool mass) × (swinging speed) ÷ (collision time with ball). The user uses the ball hitting tool by holding the ball hitting part with his hand. Since the centrifugal force of the ball hitting tool is supported by the weight of the user, the weight of the user supporting the centrifugal force is also added to the mass of the ball hitting tool. Thus, knowing the weight and center of gravity of the ball striking tool that can provide the user with the greatest centrifugal force is optimal for the user, in other words, the maximum strength and / or distance traveled by the user's normal swing. Can produce a ball hitting tool. The second step may be repeated until the weight and center of gravity that provide the maximum centrifugal force are known. Further, the number of repetitions may be determined (for example, 20 times), and the weight and the center of gravity that provide the highest centrifugal force among the specified number of times may be set as the weight and the center of gravity that provide the maximum centrifugal force.

Third Step The third step is a step of manufacturing a ball hitting tool based on the weight and the center of gravity at which the maximum centrifugal force can be measured. A ball hitting tool is manufactured based on the weight and center of gravity data obtained in the second step. Any method conventionally used to manufacture a ball hitting tool, provided that the ball hitting tool can be manufactured according to the weight and center of gravity data obtained in the second step. Is also available.

Measuring Ball Hitting Tool The measuring ball hitting tool of the present invention can be used as a measuring ball hitting tool in the first step and the second step of the method of the present invention. Embodiments of a ball striking instrument for measurement according to the present invention will be described below with reference to the drawings.

(Embodiment 1)
Fig.1 (a) is a figure explaining an example of a bat as one aspect | mode of the measurement ball | bowl hitting tool of this invention. The bat body 1 includes a ball hitting part 2 and a grip part 3. The diameter of the tip of the ball hitting part 2 is larger than the diameter on the grip part 3 side. In other words, the diameter of the ball hitting part 2 increases from the grip part 3 side toward the tip of the ball hitting part 2. The grip unit 3 is provided with a strain sensor 4. The mounting position of the strain sensor 4 is 20 to 50 cm, preferably 25 to 45 cm, more preferably 30 to 40 cm from the grip end 31. The mounting position of the strain sensor 4 may be either the grip part 3 or the ball hitting part 2 as long as it is within the above range. By setting the mounting position of the strain sensor 4 to the above-described location, the centrifugal force can be measured more easily and accurately as will be described later. The length of the grip part 3 is preferably standard to relatively long, for example, 30 to 40 cm so that the center of gravity can be changed by changing the location where the subject grips the grip part 3. Further, the grip portion 3 is preferably provided with a scale (not shown) so as to make it easy to understand the portion gripped by the subject.

  A subject grasps the grip part 3 and swings the bat body 1 to generate centrifugal force. Due to the generated centrifugal force, the bat body 1 is distorted. By attaching the strain sensor 4 to the position, the degree of distortion can be accurately measured as a numerical value. The numerical value of strain measured by the strain sensor 4 corresponds to the numerical value of centrifugal force. The numerical value of the centrifugal force measured by the strain sensor 4 may be transmitted to an external display device by wire or wirelessly, or may be displayed by the display unit 6 provided in the bat body 1 as described later. . Further, by using the strain sensor 4, not only the centrifugal force but also the swing time and swing speed of the bat body 1 by the subject can be measured.

  FIG. 1 (b) is a view showing an aspect when one weight 5 is attached to the bat body 1 of the present invention and the weight and the center of gravity of the bat body 1 are changed. The number of weights 5 attached to the bat body 1 is not limited to one, and a plurality of weights 5 may be attached, for example, two as shown in FIG. As described above, the diameter of the ball hitting portion 2 increases from the grip portion 3 side toward the tip of the ball hitting portion 2. As shown in FIGS. 1D and 1E, the weight 5 is a short cylindrical weight. The inner diameter 51 of the weight 5 is the same size as the outer diameter at an arbitrary position of the ball hitting portion 2, and the weight 5 stays at an arbitrary position of the ball hitting portion 2. When the weight 5 enters from the end of the grip portion 3 and stays at an arbitrary position, the weight and the center of gravity of the bat body 1 can be changed. The thickness 52 of the weight 5 is more preferably as thin as possible in order to prevent the ball from flying in an unintended direction, for example, when the subject hits the ball using the bat body 1. . Specifically, the thickness 52 is preferably in the range of 1 to 5 mm. Moreover, it is preferable that the weight 5 has the same inclination angle as the inclination angle of the ball hitting part 2 when viewed from the side. For the purpose of clearly grasping the position where the weight 5 is attached to the ball striking part 2, a scale can also be given to the ball striking part (not shown). It is preferable to prepare a plurality of weights 5 so as to be able to stay at various points of the ball hitting unit 2 with various weights. For example, as shown in FIG. 1 (f), a plurality of weights 53 obtained by cutting a tapered tube so as to have an arbitrary size and weight may be prepared.

(Embodiment 2)
FIG. 2 is a diagram illustrating an aspect in the case where the bat is provided with a display unit. In FIG. 2A, a display unit 6 is provided at the end of the grip unit 3. However, the place where the display unit 6 is provided is not limited to the end of the grip unit 3. When the subject uses the bat main body 1, specifically, the display unit 6 is provided at an arbitrary position as long as the grip unit 3 is gripped and the ball hitting unit 2 does not get in the way. Can do.
As shown in FIG. 2A, a calculation unit 61 connected to the strain sensor 4 may be provided inside the grip unit 3 as necessary. When the swing time and / or swing speed is measured using the strain sensor 4, the calculation unit 61 converts data collected by the strain sensor 4 into time and / or swing speed. The calculation unit 61 is connected to the display unit 6. As shown in FIG. 2B, the display unit 6 includes a liquid crystal unit 62 that displays numbers. The centrifugal force measured by the strain sensor 4, the swing time calculated by the calculation unit 61, and / or Or the swing speed is displayed.

(Embodiment 3)
Fig.3 (a) is a figure which shows another aspect of the bat which is a ball | bowl for measurement of this invention. The ball hitting part 2 in FIG. 1A has a diameter that decreases from the tip of the ball hitting part 2 toward the grip part 3. The diameter of the ball hitting part 2 in this embodiment is uniform throughout the ball hitting part. On the other hand, since the diameter of the ball striking part 2 is generally larger than the diameter of the grip part 3, a connecting part 7 for connecting the ball striking part 2 and the grip part 3 is provided.
The mounting position of the strain sensor 4 is 20 to 50 cm, preferably 25 to 45 cm, more preferably 30 to 40 cm from the grip end 31. The attachment position of the strain sensor 4 may be any of the grip part 3, the connection part 7, or the ball hitting part 2 as long as it is within the above range.
Since the ball hitting part 2 has a uniform diameter, the weight 5 can be attached to the ball hitting part 2 using, for example, a stretchable band or Velcro (registered trademark).
FIG. 3C shows a mode in which the attachment position of the display unit 6 is changed from that in the second embodiment.
Other than the above, the second embodiment is the same as the first and second embodiments.

(Embodiment 4)
FIG. 4 is a diagram for explaining an example of a golf club as one aspect of the measuring ball hitting tool of the present invention.
FIG. 4A shows an overall view of the golf club. The golf club body 8 includes a ball hitting part 2, a grip part 3, a strain sensor 4 provided in the grip part 3, and a shaft 9 that connects the ball hitting part 2 and the grip part 3. The mounting position of the strain sensor 4 is 20 to 50 cm, preferably 25 to 45 cm, more preferably 30 to 40 cm from the grip end 31. If the attachment position of the strain sensor 4 is the said range, either the grip part 3 or the shaft 9 may be sufficient.

As shown in FIGS. 4B to 4D, the ball hitting portion 2 in the golf club main body 8 is provided with a cavity 11 in which the weight 5 can be accommodated. The cavity 11 is provided with a bolt 10 for fitting a weight. As shown in FIG. 4 (f), the weight 5 in this embodiment has a hole 54 that substantially fits the bolt 10 at the center. When the weight of the golf club body 8 is changed, one or more of the weights 5 of arbitrary weight and size are fitted into the bolt 10 through the holes 54 and fixed by tightening with the nut 12 from above. To do.
Moreover, when changing the length of the golf club main body 8 and changing the gravity center of the golf club main body 8, it can be changed as follows, for example. The grip portion 3 and the shaft 9 are connected with screws as shown in FIG. When making the golf club body 8 longer, the grip portion 3 is once removed from the shaft 9 and a connection shaft 13 having an arbitrary length is sandwiched. The connection shaft 13 has a screw hole 131 that fits with the screw 32 of the grip portion 3 and a screw 132 that fits with the screw hole 91 of the shaft 9. The connecting shaft 13 connects the grip portion 3 and the shaft 9 through the screw hole 131 and the screw 132, and can make the overall length of the golf club main body 8 longer. By preparing a plurality of such connection shafts having an arbitrary length, the centrifugal force can be measured using the golf club body 8 at a length desired by the subject.

(Embodiment 5)
FIG. 5 is a diagram illustrating an aspect in which the golf club of the fourth embodiment includes a display unit. A display portion 6 is provided on the grip portion 3 of the golf club body 8. However, the location where the display unit 6 is provided is not limited to the illustrated location of the grip unit 3. When the subject uses the golf club main body 8, the display unit 6 is provided at an arbitrary position as long as it is a place that does not get in the way when the ball hitting unit 2 hits the grip unit 3. be able to.
When the display unit 6 has a liquid crystal unit 62 for displaying numbers, a calculation unit 61 may be provided inside the grip unit 3, and the centrifugal force measured by the strain sensor 4 and when measured The point that the swing time and / or the swing speed is displayed on the liquid crystal unit 62 is the same as in the second embodiment.

(Embodiment 6)
FIG. 6 is a diagram for explaining an example of a racket as one aspect of the measurement ball hitting tool of the present invention. The racket body 14 includes a ball hitting part 2, a connection part 7, a grip part 3, and a strain sensor 4 provided in the grip part 3. The mounting position of the strain sensor 4 is 20 to 50 cm, preferably 25 to 45 cm, more preferably 30 to 40 cm from the grip end 31. The attachment position of the strain sensor 4 may be any of the grip part 3, the connection part 7, or the ball hitting part 2 as long as it is within the above range.
When changing the weight and the center of gravity of the racket body 14, the weight can be changed by winding a weight rope 15 having an arbitrary weight around an arbitrary position in the frame of the ball hitting unit (see FIG. 6C). Here, the weight rope 15 is a string-like weight having a length of 10 to 30 cm and a weight of 5 to 50 g. The grip portion 3 preferably has a standard length to a comparatively long length, for example, 25 to 35 cm, so that the center of gravity can be changed by changing the location where the subject grips the grip portion 3. In addition, the point which can give a scale to the grip part 3 is the same as that of Embodiment 1. FIG.

(Embodiment 7)
FIG. 7 is a diagram illustrating a mode in which the display unit 6 is provided in the grip portion of the racket according to the sixth embodiment. It is the same as the case of each said embodiment that the installation location of the display part 6 is not limited to the location shown by FIG. In addition, the display unit 6 has a liquid crystal unit 62 for displaying numbers, the calculation unit 61 may be provided inside the grip unit 3, and the centrifugal force measured by the strain sensor 4 and the measurement The point that the swing time and / or the swing speed is displayed on the liquid crystal unit 62 is the same as in the second embodiment.

(Embodiment 8)
FIG. 8 is a diagram for explaining an example of a cricket bat as an embodiment of the measurement ball hitting tool of the present invention. The cricket bat main body 16 includes a ball hitting unit 2, a grip unit 3, and a strain sensor 4 provided in the grip unit 3. The mounting position of the strain sensor 4 is 20 to 50 cm, preferably 25 to 45 cm, more preferably 30 to 40 cm from the grip end 31. The mounting position of the strain sensor 4 may be either the grip part 3 or the ball hitting part 2 as long as it is within the above range.
When changing the weight and the center of gravity of the cricket bat main body 16, the weight 5 having an arbitrary weight is attached to an arbitrary portion of the ball hitting unit 2 using an elastic band or Velcro (registered trademark). It can be changed (see FIG. 8B). The grip portion 3 preferably has a standard length to a relatively long length, for example, 30 to 40 cm, so that the center of gravity can be changed by changing the location where the subject grips the grip portion 3. In addition, the point which can give a scale to the grip part 3 is the same as that of Embodiment 1. FIG.

(Embodiment 9)
FIG. 9 is a view illustrating an aspect in which the display unit 6 is provided in the grip portion of the eighth embodiment cricket bat. It is the same as the case of each said embodiment that the installation location of the display part 6 is not limited to the location shown by FIG. In addition, the display unit 6 has a liquid crystal unit 62 for displaying numbers, the calculation unit 61 may be provided inside the grip unit 3, and the centrifugal force measured by the strain sensor 4 and the measurement The point that the swing time and / or the swing speed is displayed on the liquid crystal unit 62 is the same as in the second embodiment.

(Embodiment 10)
FIG. 10 is a diagram for explaining an example of a hockey stick as one aspect of the measuring ball hitting tool of the present invention. The hockey stick main body 17 includes a ball hitting part 2, a connection part 7, a grip part 3, and a strain sensor 4 provided in the grip part 3. The mounting position of the strain sensor 4 is 20 to 50 cm, preferably 25 to 45 cm, more preferably 30 to 40 cm from the grip end 31. The attachment position of the strain sensor 4 may be either the grip part 3 or the connection part 7 as long as it is within the above range.
When changing the weight and center of gravity of the hockey stick main body 17, the weight 5 having an arbitrary weight is attached to an arbitrary portion of the ball hitting portion by using an elastic band or Velcro (registered trademark). It can be changed (see FIG. 10B). The grip portion 3 preferably has a standard length to a relatively long length, for example, 30 to 40 cm, so that the center of gravity can be changed by changing the location where the subject grips the grip portion 3. In addition, the point which can give a scale to the grip part 3 is the same as that of Embodiment 1. FIG.

(Embodiment 11)
FIG. 11 is a diagram illustrating an aspect in which the display unit 6 is provided in the hockey stick of the tenth embodiment. It is the same as the case of each said embodiment that the installation location of the display part 6 is not limited to the location shown by FIG. In addition, the display unit 6 has a liquid crystal unit 62 for displaying numbers, the calculation unit 61 may be provided inside the grip unit 3, and the centrifugal force measured by the strain sensor 4 and the measurement The point that the swing time and / or the swing speed is displayed on the liquid crystal unit 62 is the same as in the second embodiment.

Embodiment 12
The aspect which implements the manufacturing method of the ball hitting tool by the method of this invention using the bat of Embodiment 1 is demonstrated.
First Step In the first step, the bat of Embodiment 1 is prepared as “a measurement ball striking tool having a function of changing the weight and the center of gravity and measuring the centrifugal force”.

Second Step A subject grips the grip portion 3 in the bat body 1 of the second embodiment and swings the bat body 1. When the subject swings, the strain sensor 4 measures the numerical value of the strain, and the measured centrifugal force is displayed on the liquid crystal unit 62. The subject can grasp the grip part 3 and change the weight and attachment position of the weight 5 in various ways while swinging, so that the maximum centrifugal force can be measured, the weight of the weight 5, and the attachment of the weight 5 Determine the position. Thereby, the weight and the center of gravity of the bat that can measure the maximum centrifugal force for the subject can be known.

Third step A ball hitting tool is manufactured based on the weight and the center of gravity that can be measured for the maximum centrifugal force for the subject, which is found by the second step. Thereby, it is possible to obtain a bat that provides the maximum hitting ball strength and / or flight distance for the subject.

According to the method of the present invention, it is possible to provide an optimal ball hitting tool adapted to the physical ability of each user. Further, the above method can be carried out more easily and reliably by the ball hitting tool of the present invention.

Claims (4)

A weight for changing the weight and the center of gravity can be attached, and a strain sensor is provided in a range of 20 to 50 cm from the grip end. The strain sensor measures a strain value, and the strain value becomes a centrifugal force value. A ball hitting tool characterized by correspondingly . The ball hitting tool according to claim 1, further comprising a display unit for displaying a numerical value measured by the strain sensor. The ball hitting device according to claim 1 or 2, selected from a bat, a golf club, a tennis racket, a badminton racket, a cricket bat and a hockey stick. The ball hitting tool according to any one of claims 1 to 3 , wherein the ball hitting tool is a golf club capable of attaching a spacer for adjusting a length to a shaft.

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