Practice bat

Abstract

To provide a practice bat enabling a user to acquire an optimal posture and how to maintain the center of gravity during swing while confirming them in a baseball batting practice.SOLUTION: The current invention includes: a bat body 20; a hollow part 30 provided on a head side of the bat body 20 and having an opening on an end 23 side of the bat body 20; a lid body 31 closing the opening; a hollow part 30; and sand S housed in the hollow part 30. An internal diameter of the hollow part 30 is constant, and the volume of the sand S amounts to 30 to 80% of a volume of the hollow part 30.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a practice bat used for practicing baseball and the like. [Background technology]

[0002] Various practice bats have been proposed for baseball batting practice. Known practice bats for swinging practice swings have a hollow interior that allows for adjustment of weight and allows sand or liquid to be added or removed from the hollow interior (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 56-109774 [Patent Document 2] Japanese Utility Model Application Publication No. 59-133272 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-mentioned practice bats have the following problems: While simply adding or removing sand or liquid from the hollow portion allows a player to get a feel for the weight, it does not allow the player to confirm or master the optimal posture or center of gravity during a swing during batting practice, etc.

[0005] On the other hand, counter swings are known as a training tool that can be used to check the optimal posture and center of gravity when swinging. However, counter swings have a unique method of use, and require practice to get the hang of it. Also, because counter swings are not shaped like hitting a ball, it is not possible to experience the difference in sensation between practice swings and hitting.

[0006] The present invention was made in consideration of these problems, and its purpose is to provide a practice bat that helps players naturally confirm and acquire the optimal posture and center of gravity during swing practice, such as during baseball batting practice. [Means for solving the problem]

[0007] In order to solve the above problem, one embodiment of the practice bat of the present invention comprises a bat body, a hollow portion provided on the head side of the bat body and having an opening on the tip side of the bat body, a lid body that closes the opening, and sand contained within the hollow portion. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a technology that assists in confirming and acquiring the optimal posture, center of gravity, etc. during baseball batting practice. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a side view of a practice bat according to an embodiment of the present invention. [Figure 2] FIG. 2 is a vertical cross-sectional view of the practice bat. [Figure 3] FIG. 3 is an explanatory diagram showing how to use the practice bat. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0011] Fig. 1 is a side view of a practice bat 10 according to an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of the practice bat 10, and Fig. 3 is an explanatory diagram showing how to use the practice bat 10. In the drawings, X indicates the axial direction, and H indicates the user.

[0012] As shown in Fig. 1, practice bat 10 has a bat body 20 with a total length of, for example, about 60 to 90 cm. Bat body 20 has a grip end 21 at its lower part and a head 22 at its upper part.

[0013] As shown in Figure 2, a hollow portion 30 with a constant inner diameter is formed on the head 22 side of bat body 20, opening toward tip 23 of bat body 20. The opening of hollow portion 30 is closed by lid 31. Sand S is contained inside hollow portion 30. That is, when practice bat 10 is swung, centrifugal force causes sand S to move within hollow portion 30 toward the tip. At this time, user H can feel the center of gravity of bat body 20 moving toward the tip.

[0014] The dimensional ratio between bat body 20 and hollow portion 30 in practice bat 10 is as follows. That is, if L1 is the axial length of bat body 20 and L2 is the axial length of hollow portion 30, then it is preferable that L2 / L1 = 0.2 to 0.5. If L2 / L1 is less than 0.2, the distance traveled by sand S is short, and the player will not feel the sand S moving during the swing. Conversely, if it exceeds 0.5, the distance traveled by sand S is long, and not all of the sand S will move toward tip 23 even after the swing is complete. Furthermore, if R1 is the outer diameter of bat body 20 and R2 is the inner diameter of hollow portion 30, then it is preferable that R2 / R1 = 0.4 to 0.8. If R2 / R1 is less than 0.4, the sand S will not move easily, and not all of the sand S will move toward tip 23 even after the swing is complete. If R2 / R1 exceeds 0.8, the sand S moves in a dispersed manner within the hollow portion 30, making it difficult to sense the movement of the sand S.

[0015] Additionally, the ratio of the volume of hollow portion 30 to the volume of bat body 20 is preferably 0.1 to 0.5. If the ratio is less than 0.1, the hollow portion becomes too small, making it difficult to ensure space for sand S to move, and the intended effect of moving sand S is not achieved. If the ratio is 0.5 or more, the rigidity of bat body 20 cannot be ensured, the durability is weakened, and actual hitting becomes impossible.

[0016] Furthermore, the volume of sand S placed in the hollow portion 30 is preferably 30 to 80% of the volume of the hollow portion 30. If the volume is less than 30% of the volume of the hollow portion 30, there is too much space and the sand S cannot move completely. If the volume is more than 80% of the volume of the hollow portion 30, there is too little space and the sand S moves too quickly.

[0017] Practice bat 10 is manufactured as follows: Bamboo plates about 0.5 to 10 mm thick are stacked and bonded together with adhesive to form bat body 20. A hole is then drilled from tip 23 of bat body 20 to form hollow portion 30. Finally, the bat is closed with bamboo lid 31.

[0018] Such a practice bat 10 is used as follows. That is, as shown in FIG. 3, user H, who is practicing hitting a baseball, holds practice bat 10 with both hands and performs a swing motion. At this time, if axial direction X of bat body 20 is perpendicular to the swing axis of user H (correct swing), sand S inside hollow portion 30 naturally moves toward tip 23, and user H feels comfortable with the swing. On the other hand, if axial direction X of bat body 20 is not perpendicular to the swing axis of user H (incorrect swing), sand S inside hollow portion 30 moves toward tip 23 along the inner wall surface of hollow portion 30, and user H feels uncomfortable with the swing. This allows user H to sense for himself whether or not he is swinging correctly.

[0019] With practice bat 10 according to this embodiment, you can feel whether you are swinging correctly just by swinging it, so you can practice swinging correctly without having to get used to using it. Also, because it looks like a regular bat, you can actually practice hitting balls.

[0020] As explained above, according to the embodiment of the present invention, when a player makes a correct swing, he or she can experience the sensation of sand S naturally moving toward the tip 23 within the hollow portion 30, which allows the player to naturally confirm and master the optimal posture and center of gravity during the swing. Furthermore, the player can actually hit a ball and compare practice swings with actual hitting. Another advantage is that the simple structure allows for low-cost manufacturing.

[0021] While the present invention has been described above as an embodiment, it is understood that the present invention is not limited to this embodiment and that various improvements and modifications can be made without departing from the spirit and scope of the invention. For example, the bat body 20 is not limited to being made by stacking bamboo plates, and ordinary wood or resin materials can also be used. [Explanation of symbols]

[0022] 10...Practice bat, 20...Bat body, 21...Grip end, 22...Head, 30...Hollow portion, 31...Cover body, S...Sand.

Claims

1. The bat body, a hollow portion provided on the head side of the bat body and having an opening on the tip side of the bat body; a lid that closes the opening; A practice bat having sand contained within the hollow portion.

2. 2. The practice bat of claim 1, wherein the inner diameter of the hollow portion is constant.

3. 2. The practice bat according to claim 1, wherein the volume of the sand is 30 to 80% of the volume of the hollow portion.

4. 2. The practice bat according to claim 1, wherein the axial length of the hollow portion is 20 to 50% of the axial length of the bat body.

5. 2. The practice bat according to claim 1, wherein the inner diameter of the hollow portion is 40 to 80% of the outer diameter of the bat body.

6. 2. The practice bat according to claim 1, wherein the ratio of the volume of the hollow portion to the volume of the bat body is 0.1 to 0.5.

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