JP2020081853A - Training bat - Google Patents

Abstract

To provide a training bat which can be used in batting training where a ball is actually hit.SOLUTION: A training bat 100 includes a core bar 170 placed within a space formed in a bat body 120; a weight 130 movable within the space; and biasing means for applying a biasing force to the weight 130. The biasing means includes a coiled first compression spring 150, and a coiled second compression spring 160. The core bar 170 is configured to pass through the coil of the first compression spring 150, through a through hole of the weight 130, and through the coil of the second compression spring 160. The weight 130 is movable between an initial position and a tip position. The biasing means is configured to apply the biasing force to the weight 130 in a direction of returning from the tip position to the initial position when the weight 130 is at the tip position.SELECTED DRAWING: Figure 1B

Description

The present invention relates to a training bat, and more particularly to a training bat that can be used in batting training such as toss batting, tea batting, and free batting (that is, batting training for actually hitting a ball).

Conventionally, a bat (so-called mascot bat) that is heavier than a normal bat has been known as a practice bat. It is known that swinging with a mascot bat helps improve swing speed.

In addition, a product called "Power Slugger" sold by Uchida Sales System Co., Ltd. is conventionally known as a training bat (see Non-Patent Document 1). By practicing to move the weight and make a sound at the impact timing when swinging with this product, you can get a swing that can transmit force to the ball at the moment of impact. It is supposed to be attached.

Uchida Sales System Co., Ltd., "PRODUCT-BASEBALL baseball training equipment", [online], [May 12, 2018 search], Internet <URL:http://www. uchida-power. jp/product/baseball/#power>

However, conventional practice bats have been limited to those used for "punching". That is, it has not been possible to perform batting practice for hitting a ball using a conventional practice bat. Therefore, even if you can get a desired swing using the conventional practice bat, you need to hit the ball with a bat different from the conventional practice bat when you hit the ball in the actual batting practice. was there. Therefore, in the actual batting practice, there is a problem in that it is difficult to realize whether or not the player is hitting with a desirable swing that he or she has acquired, and whether or not there is a change in the hit ball.

The present invention has been made to solve this problem, and a practice bat that can be used in batting practice such as toss batting, tea batting, and free batting (that is, batting practice for actually hitting a ball). The purpose is to provide.

The practice bat of the present invention is a grip part, a bat body, and a space is formed inside at least a part of the bat body, a bat body, and a core rod arranged in the space. , A weight movable in the space, and an urging means for applying an urging force to the weight, which includes a coil-shaped first compression spring and a coil-shaped second compression spring. Urging means, the through hole is provided in the weight so that the core rod can pass through the weight, and the core rod has the first compression spring In the coil of the first compression spring so that the second compression spring is also located closer to the tip of the practice bat than the weight is. And a through hole of the weight and a coil of the second compression spring, the weight is movable between an initial position and a tip position, and the tip position is A position closer to the tip of the practice bat than the initial position along the longitudinal axis direction of the practice bat, and the urging means includes the tip position when the weight is at the tip position. The biasing force from the direction to the initial position acts on the weight. Thereby, the above-mentioned object is achieved.

In one embodiment of the present invention, when the weight is in the initial position, the first compression spring is in a compressed state and the second compression spring is in a compressed state. Or it is in a neutral state.

In one embodiment of the present invention, both ends of the first compression spring are free ends, and both ends of the second compression spring are free ends.

In one embodiment of the invention, the number of turns per unit length of the second compression spring is equal to the number of turns per unit length of the first compression spring.

In one embodiment of the invention, the number of turns per unit length of the second compression spring is less than the number of turns per unit length of the first compression spring.

In one embodiment of the present invention, the second compression spring is a conical coil-shaped compression spring, and the second compression spring has the second compression spring as the tip of the training bat approaches. The spring coil radius is configured to increase monotonically.

In one embodiment of the present invention, the practice bat further comprises a guide portion for guiding the core rod so that a longitudinal axis direction of the core rod coincides with a longitudinal axis direction of the practice bat. There is.

In one embodiment of the present invention, a tip of the practice bat is configured to be openable and closable, and the practice bat has the first bat while the tip of the practice bat is open. At least one of the compression spring, the weight, and the second compression spring is replaceable.

In one embodiment of the invention, the practice bat is a metal bat.

According to the present invention, it is possible to provide a practice bat that can be used in batting practice such as toss batting, tea batting, and free batting (that is, batting practice for actually hitting a ball).

The figure which shows an example of the internal structure of the practice bat 100 when the weight 130 exists in an initial position. The figure which shows an example of the internal structure of the practice bat 100 when the weight 130 exists in a front-end position. The figure which shows another example of the internal structure of the practice bat 100 when the weight 130 is in an initial position. The figure which shows another example of the internal structure of the practice bat 100 when the weight 130 exists in a front-end position. The figure which shows another example of the internal structure of the practice bat 100 when the weight 130 is in an initial position. The figure which shows another example of the internal structure of the practice bat 100 when the weight 130 exists in a front-end position. The figure which shows a state when the batter holds the practice bat 100 and makes the position of the top. Diagram showing the state at the moment when the batter swings out the practice bat 100 Diagram showing the state of the batter hitting the ball with the practice bat 100 at the moment

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

1. Practice bat of the present invention will be described below practice bat 100 as an example of a practice bat of the present invention. The practice bat 100 is a hardball practice bat, but the present invention is not limited thereto. INDUSTRIAL APPLICABILITY The present invention can be applied to a practice bat for semi-rigid baseball and a practice bat for softball baseball. Further, the present invention can also be applied to a softball practice bat.

The practice bat 100 includes a grip portion 110 and a bat body 120. The grip portion 110 is a base portion of the practice bat 100 and is a portion to be gripped by a hand (usually, a cloth or rubber is wound to prevent slippage). The bat body 120 is a portion of the practice bat 100 other than the grip portion 110. A space is formed inside at least a part of the bat body 120. The present invention utilizes such a space formed inside the bat body 120.

The practice bat 100 further includes a weight 130. The weight 130 is arranged in a space formed inside the bat body 120. The weight 130 is movable in a space formed inside the bat body 120 between an initial position and a tip position. Here, the initial position is defined as a position where the weight 130 is located when the practice bat 100 is upright with the grip portion 110 facing downward. The tip position is defined as a position closer to the tip 140 of the practice bat 100 than the initial position along the longitudinal axis direction of the practice bat 100.

The weight 130 does not matter how it is molded. For example, the weight 130 may be a processed metal lump. Alternatively, the weight 130 may be a tubular member made of polyvinyl chloride in which metal powder is enclosed.

The practice bat 100 further includes a biasing means for exerting a biasing force on the weight 130. When the weight 130 is at the tip position, the biasing means is configured so that the biasing force in the direction of returning from the tip position to the initial position acts on the weight 130.

An example of the internal structure of the practice bat 100 when the coil-shaped compression spring 150 and the coil-shaped compression spring 160 function as the biasing means will be described below with reference to FIGS. 1A and 1B.

The practice bat 100 further includes a core rod 170 arranged in a space formed inside the bat body 120. The weight 130 is provided with a through hole so that the core rod 170 can pass through the weight 130. The core rod 170 is arranged such that the compression spring 150 is located closer to the grip portion 110 than the weight 130, and the compression spring 160 is located closer to the tip 140 of the practice bat 100 than the weight 130. It is configured to pass through the coil of the compression spring 150, the through hole of the weight 130, and the coil of the compression spring 160. Thereby, the weight 130 is movable between the initial position and the tip position along the longitudinal axis direction of the core rod 170.

In the example shown in FIGS. 1A and 1B, one end of the compression spring 150 is a free end, and the other end of the compression spring 150 is also a free end. That is, both ends of the compression spring 150 need not be connected or fixed to anything. Because the movement of the compression spring 150 is restricted by the core rod 170, it is not necessary that one end of the compression spring 150 is connected to the weight 130, and the other end of the compression spring 150 is the core rod 170 or the grip portion 110 or the butt. This is because it need not be fixed to the main body 120.

In the example shown in FIGS. 1A and 1B, one end of the compression spring 160 is a free end, and the other end of the compression spring 160 is also a free end. That is, both ends of the compression spring 160 need not be connected or fixed to anything. Because the movement of the compression spring 160 is restricted by the core rod 170, one end of the compression spring 160 does not need to be connected to the weight 130, and the other end of the compression spring 160 is the core rod 170 or the practice bat 100. This is because it is not necessary to be connected to the tip 140 or the bat body 120.

In the example shown in FIGS. 1A and 1B, a tapered portion 180 protruding from the core rod 170 in the outer peripheral direction is formed at one end of the core rod 170. For example, the tapered portion 180 and the core rod 170 may be integrated by inserting one end of the core rod 170 into a hole formed in the center of the tapered portion 180. The tapered portion 180 is preferably formed of an elastic body such as rubber, but the material of the tapered portion 180 is not limited to this. The core rod 170 is required to have a certain degree of strength, and therefore it is preferable that the core rod 170 is formed of a strong material such as duralumin, but the material of the core rod 170 is not limited to this. The tapered portion 180 can be inserted into the grip portion 110 or the butt body 120 such that the outer wall of the tapered portion 180 contacts the inner wall of the grip portion 110 or the inner wall of the bat body 120. Thereby, the tapered portion 180 functions as a guide portion for guiding the core rod 170 so that the longitudinal axis direction of the core rod 170 matches the longitudinal axis direction of the practice bat 100. Further, a recess for receiving the other end of the core rod 170 may be provided on the back side of the tip 140 of the practice bat 100. For example, the recess and the core rod 170 may be integrated by inserting the other end of the core rod 170 into the recess formed in the center portion on the back side of the tip 140 of the practice bat 100. As a result, this recess also functions as a guide portion for guiding the core rod 170 so that the longitudinal axis direction of the core rod 170 matches the longitudinal axis direction of the practice bat 100. Alternatively, both the tapered portion 180 and the recess formed in the central portion on the back side of the tip 140 of the practice bat 100 are cored so that the longitudinal axis direction of the core rod 170 coincides with the longitudinal axis direction of the practice bat 100. You may make it function as a guide part for guiding the rod 170. The weight 130 is configured to be movable between an initial position and a tip position along the longitudinal axis direction of the core rod 170. Therefore, the weight 130 can move between the initial position and the tip position along the longitudinal axis direction of the practice bat 100.

The core rod 170 may be integrally formed with the tip 140 of the practice bat using the same material as the tip 140 of the practice bat, but the material is not limited to this. For example, the core rod 170 is a member separate from the tip 140 of the training bat, and the core rod 170 and the tip 140 of the training bat may be adhered to each other.

When the weight 130 is in the initial position, the compression spring 150 is in a compressed state and the compression spring 160 is in a compressed state. In this case, when the weight 130 moves from the initial position toward the tip position, the compression spring 150 transitions from the compressed state to the neutral state, and the compression spring 16 further moves from the compressed state. A transition is made toward the compressed state (ie, the weight 130 further compresses the compression spring 160). When the weight 130 further moves toward the tip position after the compression spring 150 reaches the neutral state, the weight 130 is separated from one end of the compression spring 150, and the weight 130 further compresses the compression spring 160. When the weight 130 is at the tip position, the biasing force in the direction of returning from the tip position to the initial position acts on the weight 130. Here, the biasing force in the direction of returning from the tip position to the initial position is the biasing force of the compression spring 160 (that is, the force in the direction from the tip position to the initial position, and is proportional to the magnitude of compression of the compression spring 160. Power). This is because the biasing force of the compression spring 150 does not act on the weight 130 at the tip position.

Alternatively, when the weight 130 is in the initial position, even if the compression spring 150 is in the compressed state and the compression spring 160 is in the neutral state (that is, the expansion/contraction amount of the spring is zero). Good. In this case, when the weight 130 moves from the initial position toward the tip position, the compression spring 150 makes a transition from the compressed state to the neutral state, and the compression spring 160 is compressed from the neutral state. The compression spring 160 is compressed (the compression spring 160 is compressed by the weight 130). When the weight 130 further moves toward the tip position after the compression spring 150 reaches the neutral state, the weight 130 is separated from one end of the compression spring 150, and the weight 130 further compresses the compression spring 160. When the weight 130 is at the tip position, the biasing force in the direction of returning from the tip position to the initial position acts on the weight 130. Here, the biasing force in the direction of returning from the tip position to the initial position is the biasing force of the compression spring 160 (that is, the force in the direction from the tip position to the initial position, and is proportional to the magnitude of compression of the compression spring 160. Power). This is because the biasing force of the compression spring 150 does not act on the weight 130 at the tip position.

It should be noted that each of the compression spring 150 and the compression spring 160 may be a single spring or may be a combination of a plurality of springs.

FIG. 1A shows an example of the internal structure of the practice bat 100 when the weight 130 is in the initial position.

When the weight 130 is in the initial position, the compression spring 150 and the compression spring 160 are in a state in which the compression spring 150 is compressed and the compression spring 160 is compressed (or a neutral state). It is configured as in. For example, when the practice bat 100 is erected with the grip portion 110 facing downward, between the compression spring 150 in a compressed state and the compression spring 160 in a compressed state (or a neutral state). By arranging the weight 130, the weight 130 may be arranged at the initial position.

FIG. 1B shows an example of the internal structure of the practice bat 100 when the weight 130 is at the tip position.

The compression spring 160 is configured such that, when the weight 130 is at the tip position, an urging force in the direction of returning from the tip position to the initial position acts on the weight 130. As will be described later, when the practice bat 100 swings, centrifugal force acts on the weight 130. The spring coefficient of the compression spring 150 or the spring coefficient of the compression spring 160 is designed in advance so that the centrifugal force acting on the weight 130 and the biasing force acting on the weight 130 are balanced.

According to the embodiment shown in FIGS. 1A and 1B, both ends of the compression springs 150 and 160 can be free ends, as described above. This eliminates the need to connect or fix both ends of the compression springs 150 and 160 to something. Thereby, the manufacturing process of the practice bat 100 can be significantly simplified. That is, the compression spring 150, the weight, and the compression spring 160 are passed through the mandrel 170 in this order, and the mandrel 170 is placed in the space formed inside the practice bat 100, so that the compression spring The practice bat 100 can be easily manufactured without requiring a step of connecting or fixing both ends of the 150 and 160 to something.

Note that in the example shown in FIGS. 1A and 1B, the number of turns per unit length of the compression spring 160 is equal to the number of turns per unit length of the compression spring 150, but the number of turns per unit length of the compression spring 160 is It may be smaller than the number of turns per unit length of the compression spring 150. A configuration in which the number of turns of the compression spring 160 per unit length is smaller than the number of turns of the compression spring 150 per unit length is also within the scope of the present invention. With such a configuration, it is possible to further reduce the volume of the compression spring 160 when the compression spring 160 is compressed. Therefore, it can be said that it is advantageous in that the tip position of the weight 130 can be brought closer to the tip 140 of the practice bat 100.

2A and 2B show an example of the internal structure of the practice bat 100 when the compression spring 160 shown in FIGS. 1A and 1B is replaced with a compression spring 160′. The number of turns per unit length of the compression spring 160′ is smaller than the number of turns per unit length of the compression spring 160′. According to the configuration shown in FIG. 2B, it is possible to satisfy (L ₂ shown in FIG. 2B)<(L ₁ shown in FIG. 1B). Because the number of turns per unit length of the compression spring 160 ′ is smaller than the number of turns per unit length of the compression spring 160, the tip position of the weight 130 can be brought closer to the tip 140 of the practice bat 100. is there. At least in this respect, it can be said that the configurations shown in FIGS. 2A and 2B are advantageous as compared with the configurations shown in FIGS. 1A and 1B. Here, L ₂ represents the distance between the weight 130 and the tip 140 of the practice bat 100 when the weight 130 is at the tip position in the configuration shown in FIG. 2B, and L ₁ is the configuration shown in FIG. 1B. In, the distance between the weight 130 and the tip 140 of the practice bat 100 when the weight 130 is at the tip position is shown.

In the examples shown in FIGS. 1A, 1B, 2A, and 2B, the radius of the coil of the compression spring 160 is constant, but the radius of the coil of the compression spring 160 becomes closer to the tip 140 of the practice bat 100. The compression spring 160 may be configured to monotonically increase (ie, the radii of the coils are equal or increasing). It is also within the scope of the present invention that the radius of the coil of the compression spring 160 monotonically increases as it approaches the tip 140 of the practice bat 100. With such a configuration, the weight 130 can be moved slowly toward the tip 140 of the practice bat 100, as compared with the configuration in which the radius of the compression spring 160 is constant, and the weight 130 can be practiced. It is possible to gradually reduce the moving speed of the weight 130 as it approaches the tip 140 of the bat 100.

3A and 3B show an example of the internal structure of the practice bat 100 when the compression spring 160′ shown in FIGS. 2A and 2B is replaced with a compression spring 160″. The compression spring 160″ has a conical shape. It is a coiled compression spring. The radius of the coil of the compression spring 160″ increases as it approaches the tip 140 of the practice bat 100. According to the configurations shown in FIGS. 3A and 3B, the configurations shown in FIGS. 1A and 1B and FIGS. 2A and 2B. It is possible to move the weight 130 slowly toward the tip 140 of the practice bat 100 as compared to the configuration shown in 2B, and the weight 130 moves as the weight 130 approaches the tip 140 of the practice bat 100. At least in this respect, the configuration shown in FIGS. 3A, 3B may be compared to the configurations shown in FIGS. 1A, 1B and 2A, 2B. Can be said to be advantageous.

In the example shown in FIGS. 1A, 1B, 2A, 2B, 3A, and 3B, the grip portion 110 is solid and the bat body 120 is partially hollow. However, the internal structures of the grip portion 110 and the bat body 120 are not limited to this. The bat body 120 has any internal structure as long as a space is formed inside at least a part of the bat body 120 and the weight 130 can move between the initial position and the tip position in the space. It is possible.

Further, in the example shown in FIGS. 1A, 1B, 2A, 2B, 3A, and 3B, the compression spring 150 and the compression spring 160 are described as an example of the biasing means for generating the biasing force. Is not limited to this. Instead of the compression spring 150 and/or the compression spring 160, any biasing means for generating a biasing force can be used.

Further, in the practice bat 100 shown in FIGS. 1A, 1B, 2A, 2B, 3A, and 3B, the tip 140 of the practice bat 100 may be configured to be openable and closable. In this case, the practice bat 100 may be configured such that the weight 130 can be replaced while the tip 140 of the practice bat 100 is open. For example, by preparing weights of various weights (for example, 500 g, 250 g, and 100 g) as the weight 130 and making them replaceable, one practice bat 100 having a plurality of weights different in weight is prepared. It becomes possible to use it as if it were a training bat. Alternatively, the practice bat 100 may be configured such that at least one of the compression spring 150 and the compression spring 160 can be replaced while the tip 140 of the practice bat 100 is open. It should be noted that the configuration is such that the tip 140 of the practice bat 100 can be opened and closed. For example, the tip 140 of the practice bat 100 is made detachable so that the thread (or thread) formed on the tip 140 and the thread (or thread) formed on the bat body 120 are engaged. Alternatively, the convex portion formed at the tip 140 may be pushed into the concave portion formed in the bat body 120.

Further, the practice bat 100 is typically a metal bat. Since both the grip portion and the bat body are originally hollow, the metal bat does not require a step of forming a space inside the bat body. Therefore, it can be said that the metal bat is suitable for manufacturing the practice bat of the present invention. However, the practice bat of the present invention is not limited to the metal bat. The practice bat of the present invention may be a bat formed of any material as long as a space is formed inside at least a part of the bat body. For example, the practice bat of the present invention may be a wooden bat having a space formed therein by hollowing out at least a part of the bat body.

2. Batting practice using the practice bat of the present invention The practice bat 100 having the internal structure shown in FIGS. 1A and 1B is externally the same as a normal bat. Therefore, as with a normal bat, it is possible to use the practice bat 100 to perform batting practice such as toss batting, tea batting, and free batting (that is, batting practice for actually hitting a ball). The same applies to the practice bat 100 having the internal structure shown in FIGS. 2A and 2B. The same applies to the practice bat 100 having the internal structure shown in FIGS. 3A and 3B.

4A to 4C show how a batter holds, swings, and swings the practice bat 100.

FIG. 4A shows a state in which the batter holds the practice bat 100 and creates the position of the top. At this time, the weight 130 is in the initial position inside the practice bat 100. Immediately before the bat is swung from the top position shown in FIG. 4A, the batter momentarily shakes the practice bat 100 in the longitudinal axis direction of the practice bat 100 (the direction of arrow A shown in FIG. 4A). .. By this operation, the weight 130 inside the practice bat 100 moves from the initial position toward the tip position. At this time, an urging force acts on the weight 130 in a direction of returning from the tip position to the initial position. At the same time, a centrifugal force acts on the weight 130 when the batter swings out the practice bat 100. In this way, the biasing force acting on the weight 130 and the centrifugal force acting on the weight 130 are balanced with each other, and the weight 130 remains near the tip position. Thereby, the batter swings the practice bat 100 while feeling the weight near the tip 140 of the practice bat 100 from the time when the practice bat 100 is struck to the time when the ball is hit and the follow-through is finished. Is possible.

4B shows a state at the moment when the batter swings out the practice bat 100, and FIG. 4C shows a state at the moment when the batter hits the ball with the practice bat 100 at the moment of impact.

According to the batting practice using the practice bat 100, the batter can acquire a "feeling of weight near the tip of the bat just before swinging the bat and swinging the bat while feeling the weight". It is possible. This feeling is important. This is because by learning this sensation, the trajectory of the bat swinging out and the bat swing can be improved.

According to the practice bat 100 having the internal structure shown in FIGS. 1A, 1B, 2A, 2B, 3A, and 3B, the compression springs 150 and 160 (or the compression springs 150 and 160′, or the compression springs) are compressed. The presence of the springs 150, 160″) allows the batter to feel a “float” of the weight 130 as the weight 130 moves from the initial position toward the tip position. As a result, the batter can feel the movement of the weight with a natural feeling, and can swing while feeling the weight near the tip of the bat. Furthermore, by using a compression spring instead of a tension spring, both ends of the compression spring can be made free without fixing. Thereby, the manufacturing process of the practice bat 100 can be significantly simplified.

In particular, according to the practice bat 100 having the internal structure shown in FIGS. 3A and 3B, the presence of the conical coiled compression spring 160″ is shown in FIGS. 1A, 1B, 2A and 2B. It is possible to move the weight 130 slowly toward the tip 140 of the practice bat 100, as compared to the practice bat 100 having an internal structure, and the weight 130 approaches the tip 140 of the practice bat 100. It is possible to gradually reduce the moving speed of 130. According to the practice bat 100 having the internal structure shown in FIGS. 3A and 3B, the batter can move the practice bat 100 from the top position. It is still possible to continue to feel the weight near the tip of the bat, even after swinging it out, so the practice bat 100 having the internal structure shown in Figures 3A and 3B provides the bats of Figures 1A and 1B. Compared to the practice bat 100 having the internal structure shown in FIG. 1B, FIG. 2A, and FIG. 2B, while feeling the weight near the tip of the bat for a longer period of time, wear the feeling of swinging the bat while feeling the weight. In this way, it is important that the weight is felt for a long time near the tip of the bat during the process of swinging the bat from swinging. This is because the trajectory of the swing can be further improved.

The inventor, for many years, served as the director of the All Hirakata Boys Elementary School and taught batting from the 1st grade to the 6th grade. Since there is a clear difference in power between children in the upper grades of elementary school and children in the lower grades of elementary school, how to teach batting for children in the lower grades of elementary school has been a long-standing concern. The present invention is based on the results of seeing that batting of children in the lower grades of elementary school tends to be pushed by the momentum of the ball, and continuing to think about how to teach batting to solve it. It is a thing.

By repeating batting practice using the practice bat 100, even a weak elementary school child can hit back the ball thrown by the elementary school high school child. This is a swing that conveys power to the ball without wasting by learning "a feeling of weight near the tip of the bat just before swinging the bat, and feeling that the bat swings the bat while feeling that weight". Believed to be from. Of course, the batting practice using the practice bat 100 is not only useful for elementary school students, but also useful for all baseball players such as middle school students, high school students, college students, and working adults. This is because a swing that transmits power to the ball without waste is useful for all baseball players, whether or not they have power.

Although the swing completed in this way seems to come out in a detour, unlike the swing where it is good to put out the bat at the shortest distance to impact with the inside out which was the conventional example It can be said that it is a good swing to run the tip of the bat to reach an impact. Such a swing is far from the conventional common sense of baseball, and should be called a "swing revolution" following the "fly ball revolution". By repeating the batting practice using the practice bat 100, the completed swing based on the new swing theory can be obtained.

Although the present invention has been illustrated by using the preferred embodiment of the present invention as described above, the present invention should not be construed as being limited to this embodiment. It is understood that the scope of the present invention should be construed only by the scope of the claims. It is understood that those skilled in the art can implement equivalent ranges based on the description of the present invention and common general knowledge from the description of the specific preferred embodiments of the present invention.

INDUSTRIAL APPLICABILITY The present invention is useful as a training bat or the like that can be used in batting practice such as toss batting, tea batting, and free batting (that is, batting practice for actually hitting a ball).

100 practice bat 110 grip portion 120 bat body 130 weight 140 tip of bat for practice 150 compression spring 160 compression spring 160' compression spring 160" compression spring 170 core rod 180 taper member (guide part)

Claims (1)

A practice bat as described in the specification.