KR102242695B1 - Sporting goods for Changing and adjusting Center of Mass of Swing Equipment Very Easily and Safely - Google Patents

Abstract

The present invention relates to a technical idea of finely adjusting a swing weight by safely and simply moving the center of gravity of swing exercise equipment such as a baseball bat. The equipment according to an embodiment includes an equipment main body in which the center of gravity formed in a striking portion on the side facing a handle portion rotates about a position gripped in the handle portion as an axis, and a weight fixed in a form of being mounted on the handle portion.

Description

Sporting goods for Changing and Adjusting Center of Mass of Swing Equipment Very Easily and Safely

The present invention relates to a technical idea of fine-tuning the balance of the device by safely and simply moving the center of gravity of a swinging device such as a baseball bat.

With the popularity of baseball, technology for baseball-related equipment is also developing.

In particular, the bat is a device for striking a baseball ball, and is divided into abstract expressions such as a top, a middle top, and a middle according to the position of the center of gravity. The reality is that it is very difficult for the batter to select the most appropriate bat for him due to this unstandardized abstract expression.

In addition, the center of mass of the bat is sold in a fixed form according to the type of model or brand characteristics at the time of manufacture.

Accordingly, in recent years, there is an increasing interest in technology that allows the center of gravity of the bat to be safely and easily moved at any time. In particular, the batter needs to move the center of gravity of the bat equipped with this technology very easily and safely in the baseball stadium to properly adjust the balance of the bat according to the condition of the day.

The batter has a need to very easily adjust the center of gravity of the bat to the desired level according to the pitcher's ball speed or his condition in a baseball stadium.

Nevertheless, there are very limited technologies related to this to date. The related technologies have limitations such as a sharp increase in production cost, increased risk for baseball players, difficulty in mass production methods, and lack of convenience in use, despite the advantage of being able to control the center of gravity of the bat.

As a related technology, Korean Application No. 10-2011-0003331 discloses a baseball bat that can be used by various age groups by adjusting the center of gravity. Korean Application No. 10-2011-0003331 extends to a diameter larger than the diameter of the handle part, and a groove is formed in the longitudinal direction in the groove, and the groove is inserted into the groove of the striking part and the striking part. , It has a bar in which fastening grooves are formed on both ends. Through this, Korean Application No. 10-2011-0003331 allows users to feel a variety of weights by adjusting the position of the weight, and accordingly, the effect that various age groups can use with one baseball bat, and the body shape of the batter. And since the center of gravity can be adjusted according to the hitting posture, the effect of stably hitting is disclosed. However, Korean Application No. 10-2011-0003331 has a problem that is difficult to commercialize because the production process is very complex, production cost is increased, and mass production is limited. In addition, there is a risk that the contents inside the bat may come off when swinging.

On the other hand, Korean Patent Registration No. 10-1098668 is a swing exerciser capable of practicing swing at a desired speed by operating only at a speed higher than the value of the movement and additional manipulation built into the body to generate a hitting sound. Korean Patent Registration No. 10-1098668 discloses a tubular body, a first cover and a second cover installed at both ends of the body, a moving weight built into the body and sliding in the longitudinal direction, and a moving weight in the direction of the first cover. A spring that is in close contact, a shaft that is supported by the first cover and the second cover so as to slide in the axial direction through the moving weight, and one end is exposed to the outside of the second cover, and a magnet integrated with the shaft between the first cover and the moving weight And a magnet adjuster that is integrally fixed to the exposed shaft through the second cover and is helically coupled to the second cover to move the magnet by transporting the shaft as it rotates.

According to Korean Patent No. 10-1098668, if the display part is matched to the scale, the distance between the magnet and the moving weight is adjusted, and the sound is generated only when the target head speed comes out during swing. The effects that can be acquired by the body are being disclosed.

However, the purpose of Korean Patent Registration No. 10-1098668 is a practice bat that makes a hitting sound when a desired speed comes out during practice, and cannot be used in an actual baseball game.

Therefore, it is necessary to develop a bat that can freely adjust the balance of the bat by moving the center of mass of the bat very simply and safely.

Korean Patent Application No. 10-2011-0003331 "Baseball bat using weight center" Korean Patent Registration No. 10-1098668 "Swing Exercise Machine"

An object of the present invention is to allow the center of gravity of the bat to be safely and conveniently moved at any time.

An object of the present invention is to adjust the center of gravity of the bat at a desired level very quickly and easily during a match according to the pitcher's ball speed or his condition.

An object of the present invention is to make a bat fitting suitable for a batter through precise movement of the center of gravity when selecting a bat to purchase.

The mechanism according to an embodiment is a mechanism body in which a center of gravity formed at a striking portion facing the handle portion rotates with a position gripped at the handle portion as an axis, and while maintaining the shape of the handle portion as it is, It may include a weight inserted from the outside into the inside of the handle portion, or mounted in a form surrounding the handle portion and then fixed.

The instrument body according to an embodiment includes a nut groove in which a thread having a predetermined depth is engraved in a knob positioned at the handle portion, and the weight is screwed to the nut groove in the form of a bolt. I can.

The weight according to an embodiment may be mounted in at least one of a material elasticity, a snapping method, a magnet, an adhesive method, a taping method, and a Velcro method in a knob positioned at the handle part.

The weight according to an embodiment is in the form of a hemisphere surrounding a knob positioned at the handle portion, and is attached to the handle portion, and applies an external force of a predetermined amount or more in a direction opposite to the direction from the handle portion toward the center of gravity. When applied, it can be detached from the handle portion.

The weight according to an embodiment has a mass according to a predetermined criterion so that the center of gravity moves 0.7mm per gram in a specific area on a virtual straight line formed between the handle portion and the hitting portion. It is done.

In the bat according to an embodiment, the center of gravity formed at the striking portion facing the handle portion rotates with the gripped position at the handle portion as an axis, but without a separate tool at the knob side of the handle portion While maintaining the shape of the knob as it is, the center of gravity may be changed according to a weight that is inserted into the knob from the outside or mounted in a form surrounding the knob.

The weight according to an embodiment may be mounted in a nut groove formed at the end of the handle in a screw manner.

According to one embodiment, the center of gravity of the bat can be safely and conveniently moved at any time.

According to an embodiment, the center of gravity of the bat can be adjusted very quickly and easily during a match to a desired level depending on the pitcher's ball speed or his condition.

According to an embodiment, a bat fitting suitable for a batter may be performed through precise movement of the center of gravity when selecting a bat to purchase.

1 is a view for explaining the center of gravity located at the striking portion of the bat.
2A to 2C are views for explaining an embodiment in which a weight center of a bat is finely adjusted by attaching and detaching a weight to a knob of a handle portion.
3A and 3B are diagrams for explaining fine adjustment of the center of gravity of the bat through another embodiment of a weight that is attached to and detached from a knob.
4A and 4B are diagrams illustrating a change in the center of gravity according to the additional weight of the knob.
5 illustrates an experiment result for confirming a change in a sweet spot by referring to the position of the vibration nodes of the natural vibration frequency when the weight is changed on the knob of the bat.

Specific structural or functional descriptions of embodiments according to the concept of the present invention disclosed in the present specification are exemplified only for the purpose of describing embodiments according to the concept of the present invention, and embodiments according to the concept of the present invention They may be implemented in various forms and are not limited to the embodiments described herein.

Since the embodiments according to the concept of the present invention can apply various changes and have various forms, the embodiments will be illustrated in the drawings and described in detail in the present specification. However, this is not intended to limit the embodiments according to the concept of the present invention to specific disclosed forms, and includes changes, equivalents, or substitutes included in the spirit and scope of the present invention.

Terms such as first or second may be used to describe various elements, but the elements should not be limited by the terms. The terms are only for the purpose of distinguishing one component from other components, for example, without departing from the scope of the rights according to the concept of the present invention, the first component may be referred to as the second component, Similarly, the second component may also be referred to as a first component.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. It should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle. Expressions describing the relationship between components, for example, "between" and "just between" or "directly adjacent to" should be interpreted as well.

The terms used in the present specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present specification, terms such as "comprise" or "have" are intended to designate that the specified features, numbers, steps, actions, components, parts, or combinations thereof exist, but one or more other features or numbers, It is to be understood that the presence or addition of steps, actions, components, parts or combinations thereof does not preclude the possibility of preliminary exclusion.

Unless otherwise defined, all terms used herein including technical or scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms as defined in a commonly used dictionary should be construed as having a meaning consistent with the meaning of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in the present specification. Does not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, the scope of the patent application is not limited or limited by these embodiments. The same reference numerals shown in each drawing indicate the same members.

In the present specification, the device to be entitled is a device for hitting a specific object by performing a circular or swing motion, and various types of devices in which the opposite strike part performs circular or swing motion with the handle part gripped by the user as an axis. Can be interpreted as.

For example, the equipment includes bats (baseball bats, softball bats, etc.), rackets (tennis rackets, badminton rackets, batting rackets, etc.), sticks (hockey sticks, climbing sticks, etc.), golf clubs, hammers, axes, fishing rods, etc. Can be interpreted.

Hereinafter, in the present specification, for convenience of description, the present invention will be described through a baseball bat as a representative example of an apparatus.

1 is an embodiment for explaining the center of gravity located on the striking portion of the bat.

The batter wants to select the bat 110 that can maximize his striking form and muscle strength at bat during a game, but this is not an easy task. The criteria for selecting the bat 110 include length (31 inches, 32 inches), weight (27 ounces, 28 ounces), balance (Top, Middle Top, Middle), and elasticity (wood, aluminum, carbon). .

Among them, the length, weight, and elasticity are standardized, but the center of gravity that can determine balance is not standardized and is described in abstract expressions such as Top, Middle Top, and Middle.

Looking at the bat 110, the center of gravity 130 is located, and includes a barrel 111 corresponding to the hitting portion, a connection part 112 with the handle 113, and a knob 114 for preventing separation during swing.

The swing-weight of the bat 110 represents the weight felt by the batter during a swing. That is, if the total mass of the bat 110 is heavier, the swing weight feels heavier, and even with the same total mass, the swing weight of the bat 110 whose center of gravity is closer to the knob 114 may be felt lighter. For example, if you hold the same bat upside down and swing it, it feels much lighter.

The swing weight can be adjusted by adjusting the balance of the bat 110.

According to the present invention, a point of the center of gravity for the bat 110 may be defined through the following process as shown by reference numeral 120.

First, the entire length (L) of the bat 110 is divided into 5 equal parts using the change width of the center of gravity, and each divided section can be named A, B, C, D, E from the direction of the handle part. have. In addition, each section (A to E) is divided into 5 equal parts using the change width of the center of gravity, and each is named 1, 2, 3, 4, 5 from the direction of the handle. At this time, each sub-section can be divided into about 1 inch.

In addition, each sub-section is named A1, A2, A3 ... E3, E4, E5, etc., so that the length (L) of the entire bat 110 can be divided into 25 equal parts according to the change width of the center of gravity.

When the center of gravity of the bat 110 is located in such a subdivided position, the point of the center of gravity of the bat 110 can be specified.

For example, since the center of gravity 130 is located in the second sub-section of section D, it can be expressed as a bat 110 having a center of gravity of'D2'.

In addition, the bat 110 according to the present invention can freely move the center of gravity 130 in the form of attaching and attaching a weight to the knob 114 of the handle 113. In addition, the balance of the bat 110 may be changed through the free movement of the center of gravity 130.

That is, in the present invention, rather than a change in the total mass of the device, that is, the bat 110, by attaching and detaching the weight to the knob 114, the center of gravity 130 is directed toward the knob 114, or on the barrel 111 By pointing it in the opposite direction of the knob 114, the balance can be adjusted quickly and freely.

During a match, there is a need to properly adjust the balance of the bat according to the batter's condition on the day or the pitcher's ball speed and pitch. At this time, the only thing the batter can do in the baseball field is to change to another bat or to shorten the bat. If the bat is held short, the swing speed will increase, but the momentum of force will decrease, making it relatively difficult to hit long distances.

By adjusting the swing weight of the bat 110, it is possible to adjust the balance.

On the other hand, according to the present invention, by freely adjusting the center of gravity of the bat 110, bat fitting (Bat Fitting) is possible.

When selecting a bat to purchase, it is possible to make a bat fitting suitable for the batter through precise movement of the center of gravity.

Golf clubs have already been popularized when selecting a purchase, but in the case of the bat 110, fitting was difficult because the swing weight was not finely adjusted. However, the bat 110 according to the present invention precisely adjusts the center of gravity 130 of the bat 110 as shown in reference numeral 120, so that fine adjustment of the swing weight is possible, so that the bat fitting is possible.

In addition, when the bat 110 according to the present invention is used, field bat fitting, which is a fitting in a situation in actual use, is possible. That is, in the field, the center of gravity 130 can be finely adjusted so that the optimal swing can be performed according to the condition of the pitcher and the condition of the pitcher in addition to the stadium.

When purchasing the bat 110, it is possible to make the most suitable bat fitting for the batter and also fine fitting in the stadium, so that the optimal swing weight can be generated by double fitting.

A specific embodiment of finely adjusting the center of gravity of the bat 110 in order to adjust the swing weight will be described in detail with reference to FIGS. 2 and 3 below.

According to the present invention, the weight is a method of replacing the knob itself, a method of being inserted in a state in which free attachment and detachment is not possible within the knob and being replaced with a separate tool, a method of attaching and detaching the weight to a part other than the barrel or the knob, and Is distinguished.

In the present invention, the weight used to change the overall balance by adjusting the center of gravity of the bat maintains the appearance of the bat as it is, such as a handle portion or a knob. In addition, while maintaining the shape as it is, it may be inserted into the knob of the handle portion using only tools that are readily available from the periphery such as a hand or coin, or may be fixed after being mounted in a form surrounding the knob.

The weight described in the present invention may have a mass according to a predetermined criterion so that the center of gravity moves 0.7mm per gram in a specific area on a virtual straight line formed between the handle portion and the hitting portion.

2A to 2C are views for explaining an embodiment in which a weight center of a bat is finely adjusted by attaching and detaching a weight to a knob of a handle portion.

In Figures 2a to 2c, as an example of a weight, it is possible to attach and detach using a screw method, and the present invention will be described through a bolt having a specific mass.

Referring to FIG. 2A, a nut groove 202 may be located in the knob 201 among the handles of the bat. The nut groove 202 is formed in a concave shape of a screw thread capable of binding a bolt, and may be formed directly on the bat, or may be implemented in a form in which a component such as metal having a nut groove shape is embedded in the bat.

The knob 201 of the bat may also be referred to as a bat knob, and a nut groove 202 may be formed in the circular plane of the knob 201.

2B shows the bolts 203 and 204 for fastening to the nut groove 202. Reference numeral 203 is a side view of the bolt, and reference numeral 204 is a front view of the bolt.

According to one embodiment, it is possible to change the swing weight in one step or several steps by adjusting the material and length of the bolts 203 and 204, and bolts of various weights (eg, 1 gram, 2 grams, 3 grams, etc.) You can finely adjust the swing weight through.

The weight of the bolt will be described in more detail with experimental data through FIG. 4 below.

2C shows a form in which the bolt 203 is bound to the knob 201 of the bat.

The outer surface of the bolt 203 according to an embodiment may form a groove that can be turned into a +-shaped driver, a 1-shaped driver, or a 500-won coin, and it can be easily and quickly attached and detached through the groove formed in this way. . If the batter is in need of fine adjustment of the swing weight, it can be quickly replaced with another bolt in any environment. This enables quick and easy fine adjustment of the swing weight.

For example, in order to change the swing weight D2 to C5, you can simply and conveniently adjust the swing weight by fastening a bolt heavier than the currently attached weight and moving the center of gravity of the bat to the handle.

According to the present invention, since the detachable bolt is located in the knob portion, there is no fear of being separated during bat swing and collision with the ball. If the weight is attached to the bat's striking part or the head cap part, there will be a risk of a major safety accident that is dislodged during the game. In the present invention, no matter how fast a swing or a large collision occurs during a swing, there is no risk of an accident in which the bolt is separated.

3A is a view illustrating fine adjustment of the center of gravity of the bat through another embodiment 310 of a weight that is attached to and detached from a knob.

The weight described in the embodiment of FIG. 3A is in the form of a rubber knob having a specific mass, and may be implemented in the form of a hemisphere surrounding a knob positioned on a handle portion. In addition, the rubber knob is attached to the handle portion and can be detached from the handle portion when an external force of a certain amount or more is applied in a direction opposite to the direction from the handle portion toward the center of gravity.

According to the embodiment of Fig. 3A, the diameter of the groove of the handle portion of the bat is shorter than the diameter of the groove of the knob end portion of the bat, so that it is not easily detached and fixed without being easily detached unless it is deliberately detached once it is mounted on the bat. This corresponds to an example.

For example, the rubber knob may have a mass divided in stages, such as 10g, 20g, 30g, and the like.

Reference numeral 311 denotes a shape as viewed from above, and reference numeral 312 denotes a shape as viewed from the inside of the rubber knob 311. In addition, reference numeral 313 denotes a form in which the rubber knob is bound to the knob of the bat.

According to the present invention, since the rubber knobs 311 and 312 are also located in the knob portion, like the bolts that are attached and detached by the screw method, there is no fear of being separated when the bat swing or collides with the ball. If the rubber knob is attached to the bat's striking part, there will be a risk of a major safety accident that is dislodged during the game. In the present invention, no matter how fast a swing or a large collision occurs during a swing, there is no risk of an accident in which the bolt is separated.

The weight according to an embodiment may be variously implemented in a form in which at least one of a material elasticity, a snapping, a magnet, an adhesive method, a taping method, and a Velcro method is attached to and detached from a knob located at the handle part. .

3B is a diagram illustrating fine adjustment of the center of gravity of the bat through another embodiment 300 of a weight that is attached to and detached from a knob.

In the form similar to the rubber knob of FIG. 3A of FIG. 3B, the diameter of the groove of the handle portion of the bat is longer than the diameter of the groove of the knob end portion of the bat. The weight described in the embodiment is in the form of a rubber knob having a specific mass, and may be implemented in the form of a hemisphere surrounding a knob positioned on a handle portion. In addition, the rubber knob is attached to the handle portion and can be detached from the handle portion when an external force of a certain amount or more is applied in a direction opposite to the direction from the handle portion toward the center of gravity.

For example, the rubber knob may have a mass divided in stages, such as 10g, 20g, 30g, and the like.

Reference numeral 321 denotes a shape as viewed from the top of the rubber knob, and reference numeral 322 denotes a shape as viewed from the inner surface of the rubber knob 321. In addition, reference numeral 323 denotes a form in which the rubber knob is bound to the knob of the bat.

According to the present invention, since the rubber knobs 321 and 322 are also located in the knob portion, like the bolts that are attached and detached using a screw method, there is no fear of being separated when a bat swing or a collision with a ball is performed. If the rubber knob is attached to the bat's striking part, there will be a risk of a major safety accident that is dislodged during the game. In the present invention, no matter how fast a swing or a large collision occurs during a swing, there is no risk of an accident in which the bolt is separated.

The weight according to an embodiment may be variously implemented in a form in which a knob located at a handle portion is detached and attached in at least one of a material elasticity, a snapping, a magnet, an adhesive method, a taping method, and a Velcro method. .

4A and 4B are diagrams illustrating a change in the center of gravity according to the additional weight of the knob.

First, FIG. 4A is a diagram illustrating a change in the center of gravity according to an additional weight of a knob for a maximum length bat.

^{Ash wood with a density of 0.00066799 g/mm 3} was used as the maximum length bat used in the experiment, the modulus of elasticity was 11.99688 GPa, and the Poisson's ratio was 0.4.

The total length of the bat is 1060mm, and the total volume is 1547989.019mm ³ .

The specific specifications of the bat are the maximum length bat, as shown in [Table 1] below.

[Table 1]

As shown in [Table 1], in the case of the maximum length bat, it can be assumed that the diameter of the knob is 50mm and the length is 20mm, and the volume of the bat accordingly can be calculated as 39269.9mm. Like the knob, specific specifications for the handle, connection, and barrel constituting the bat are assumed in [Table 1].

_{In addition, P cm} in [Table 1] represents the distance from the tip of the knob to the center of gravity for each part. For example, in the case of a knob with a uniform diameter, the center of gravity is exactly the middle part. _{Since the P cm} for the handle is calculated from the end of the knob, it corresponds to the length of the knob plus 2 equal parts of the length of the knob. In addition, P _cm for the connection portion may be calculated by adding the length of the central portion of the connection portion to the length from the end of the knob to the end of the handle, but taking into account the change in the diameter of the connection portion. Similarly, the P _cm for the barrel is equal to the length to the joint plus two equal parts of the length of the barrel.

In [Table 1], I _cm is the moment of inertia with respect to the center of mass calculated using mass, length, etc. In [Table 1], it corresponds to the value obtained by dividing the square of mass and length by 12, respectively. , It can be calculated by substituting the mass and length for the connection part and the barrel.

In addition, in the case of the maximum length bat, the effect on the additional weight of the knob is calculated as shown in [Table 2] below.

Specifically, each time the weight increases by 10g, the change in the position of the center of gravity can be calculated as shown in [Table 2]. Even when the additional weight increases, such as 40g, 50g, etc., the center of gravity changes proportionally.

[Table 2]

As shown in [Table 2], the change in the position of the center of gravity has a large change as the weight by the weight is added. Specifically, the weight is added to the knob of the maximum length bat from 0g to 30g in units of 10g, and the change in the center of gravity accordingly can be observed.

As shown in Fig. 4a, when the weight is not added (0g), the center of gravity is formed at a position of 739.4mm from the end of the knob, and when 10g is added to the knob (total of 10g), the position of the center of gravity is- As it approaches the 6.99mm knob, the center of gravity is formed at 732.4mm from the end of the knob. In addition, when 10g more weight is added (20g), the center of gravity is formed at 725.6mm from the tip of the knob, and when 10g more weight is added (30g), the center of gravity is formed at 718.9mm from the tip of the knob. do. In the case of the maximum length bat, when the weight is added to the knob from 0g to 30g, it can be seen that the center of gravity moves as much as -20.57mm overall.As shown in the graph of reference numeral 410, the rate of change of the center of gravity is -0.6855mm It can be calculated as /g.

Therefore, in the case of the maximum length bat, it can be confirmed by experiment that the position of the center of gravity can be adjusted according to the weight attached to the knob.

On the other hand, the 33-inch bat will be described through [Table 3] and [Table 4] below.

[Table 3]

As shown in [Table 3], in the case of a 33-inch bat, the diameter of the knob can be assumed to be 60mm and the length is 20mm, and the volume of the bat can be calculated as 56548.7mm. Like the knob, specific specifications for the handle, connection, and barrel constituting the bat are assumed in [Table 3].

In addition, as in [Table 1], in [Table 3], P _cm assumes the distance from the tip of the knob to the center of gravity of each part, and I _cm is for the center of mass calculated using mass, length, etc. It represents the moment of inertia.

[Table 4]

As shown in [Table 4], the position of the center of gravity of the 33-inch bat also changes greatly as the weight is added. Specifically, in the case of a 33-inch bat, weight is added to the knob in units of 10g from 0g to 30g, and the change in the position of the center of gravity accordingly can be observed.

As shown in Fig. 4b, when the weight is not added (0g), the center of gravity is formed at a position of 580.1mm from the end of the knob, and when 10g is added to the knob (total of 10g), the position of the center of gravity is- It gets closer to the 7.62mm knob, and the center of gravity is formed at 572.5mm from the end of the knob. In addition, when 10g more weight is added (20g), the center of gravity is formed at 565.1mm from the end of the knob, and when 10g more weight is added (30g), the center of gravity is formed at 557.8mm from the end of the knob. do. In the case of a 33-inch long bat, when the weight is added to the knob from 0g to 30g, it can be seen that the center of gravity moves as much as -20.57mm overall.As shown in the graph of reference numeral 420, the rate of change of the center of gravity is- It can be calculated as 0.7424mm/g. Even when the additional weight increases, such as 40g, 50g, etc., the center of gravity changes proportionally.

Therefore, it can be confirmed by experiment that the center of gravity can be adjusted according to the weight attached to the knob even for the 33-inch long bat.

5 illustrates an experiment result for confirming a change in a sweet spot by referring to the position of the vibration nodes of the natural vibration frequency when the weight is changed on the knob of the bat.

As a result, as a result of comparing the positions of the vibration nodes of the natural vibration frequency, there is no difference in the positions of the vibration nodes according to the knob mass, indicating that the sweet spot of the bat does not change according to the additional mass of the knob.

Specifically, FIG. 5 is a diagram showing a result of measuring a free vibration node for a basic bat by classifying a natural vibration mode for each natural frequency band without adding a weight.

5 illustrates an experiment result for confirming a change in a sweet spot when a weight on a knob of the bat is changed.

First, reference numeral 510 is set to the first natural vibration mode, and compares the results of measuring the free vibration node when the knob is not equipped with a weight (512), and when a 30g weight is mounted on the knob (513). I'm doing it.

Reference numeral 511 corresponds to a portion in which the transition to the free vibration node is 0 in the situation of the first natural vibration mode, and corresponds to a sweet spot.

In the case of reference numeral 510, it can be seen that the sweet spot is maintained without significant change even though an additional weight of 30g is added to the knob.

Next, reference numeral 520 is set to the second natural vibration mode, and the result for the free vibration node is compared in the case where the weight is not mounted on the knob (522) and the 30g weight is mounted on the knob (523). I'm doing it.

Similarly, reference numeral 521 corresponds to a portion in which the transition to the free vibration node is 0 in the situation of the second natural vibration mode, and corresponds to a sweet spot.

In the embodiment of reference numeral 520 as well, it can be seen that the sweet spot is maintained without a large change even though an additional weight of 30 g is additionally mounted on the knob.

Reference numeral 530 prepares the results for the free vibration node in the case of setting to the third natural vibration mode and not mounting a weight on the knob (532), and mounting a 30g weight on the knob (533).

Similarly, reference numeral 531 corresponds to a portion in which the transition to the free vibration node is 0 in the context of the third natural vibration mode, and corresponds to a sweet spot.

In the embodiment of reference numeral 530 as well, it can be seen that the sweet spot is maintained without a large change even though an additional weight of 30g is additionally mounted on the knob.

As confirmed in the previous embodiment, when an additional weight is mounted on the knob, the overall balance is changed due to the change in the center of gravity, but the sweet spot is maintained as it is. Therefore, by changing the weight on the knob side, quick and accurate fitting is possible. In addition, unlike weights mounted on handles or barrels, the risk of separation during swing can be significantly reduced.

After all, if the present invention is used, the center of gravity of the bat can be safely and conveniently moved at any time. In addition, the bat's center of gravity can be adjusted very quickly and easily during a match to the desired level according to the pitcher's ball speed or his condition, and the bat fitting suitable for batters through precise movement of the center of gravity when selecting a bat. can do.

As described above, although the embodiments have been described by the limited drawings, various modifications and variations can be made from the above description to those of ordinary skill in the art. For example, the described techniques are performed in a different order from the described method, and/or components such as systems, structures, devices, circuits, etc. described are combined or combined in a form different from the described method, or other components Alternatively, even if substituted or substituted by an equivalent, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and those equivalent to the claims also fall within the scope of the claims to be described later.

Claims (7)

A mechanism body in which a center of gravity formed at a striking portion opposed to the handle portion rotates with a position gripped at the handle portion as an axis; And
While maintaining the shape of the handle portion including the knob as it is, including a weight that is inserted into the handle portion from the outside, or mounted in a form surrounding the handle portion and then fixed,
The instrument body,
And a nut groove in which a thread having a predetermined depth is engraved in the knob integrally fixed to the handle portion,
The weight is mounted in a screw manner in the nut groove without a separate tool in the form of a bolt without additional protrusion while maintaining the shape of the knob, or in the form of a hemisphere surrounding the knob, the knob ), it is mounted in at least one of the elasticity, snapping, magnet, adhesive method, taping method, and Velcro method, and considers the variation of the center of gravity in a specific area on a virtual straight line formed in the handle part and the striking part. Thus, there is no difference in the position of the part where the variation of the vibration node is 0, so that the sweet spot is maintained, the center of gravity is formed to move toward the handle part by 0.7mm per gram, so that the proportional fine adjustment is possible It has a mass according to the standard, and it is not separated when it collides with the bat swing and the ball because it is in the knob, and the overall balance is changed due to the change of the center of gravity, but the sweet spot is maintained. Mechanism characterized by. delete delete The method of claim 1,
The weight is attached to the handle portion, characterized in that when an external force of a certain amount or more is applied in a direction opposite to a direction from the handle portion toward the center of gravity, the device is detached from the handle portion. delete The center of gravity formed at the striking portion facing the handle portion rotates with the gripped position at the handle portion as an axis, but the knob is integrally fixed to the handle portion without a separate tool. While maintaining the shape as it is, the center of gravity is variable according to a weight that is inserted from the outside into the inside of the knob or mounted in a form surrounding the knob,
Above weight
In the form of a hemisphere surrounding the knob or mounted in a screw manner of a bolt without an additional protruding part in a nut groove in which a thread of a predetermined depth is engraved on the knob, the elasticity of the material in the knob, snapping, magnet, It is mounted in at least one of an adhesive method, a taping method, and a Velcro method, and in a specific area on a virtual straight line formed between the handle part and the striking part, the variation of the vibration node is zero in consideration of the variation of the center of gravity. As there is no position difference, the sweet spot is maintained, and the center of gravity has a mass according to a predetermined standard so that the center of gravity is formed to move toward the handle portion by 0.7mm per gram so that a proportional fine adjustment is possible, The bat, characterized in that it is not separated when the bat swings and collides with the ball because it is located in the knob, and the overall balance is changed due to the change in the center of gravity, but the sweet spot is maintained. delete

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