Impact instrument such as a racket or a bat

Abstract

To solve the problem that a position for gripping a hitting implement corresponding to a sweet spot is not clear in the hitting implement in which only one sweet spot is marked and it is necessary to clarify the position for gripping the hitting implement corresponding to the position marked as the sweet spot.SOLUTION: To enable anyone to accurately hit a ball at a sweet spot by displaying the accurate sweet spot and a position for gripping a hitting tool corresponding to the sweet spot only by simply putting a mark.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a tool (racket or bat) used to hit a ball in tennis, baseball, or other ball-hitting sports. [Background technology]

[0002] It has long been known that there is a sweet spot when hitting a ball.

[0003] Research has been conducted into devices that are designed to allow the ball to be hit at the sweet spot.

[0004] Conventionally, there have been invented devices that indicate the position of the sweet spot with a protrusion or the like (Patent Document 1), and a structure that records that the ball has been hit on the sweet spot (Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Utility Model Registration No. 3240113 [Patent Document 2] Japanese Utility Model Application Publication No. 6-75542 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the structures proposed in both Patent Documents 1 and 2, only one sweet spot is marked, and the position for gripping the hitting implement that corresponds to that sweet spot is unclear. With such conventional technology, even if the ball can be hit at the position marked as the sweet spot, if the position in which the hitting implement is gripped is different, the hitting position is not necessarily the sweet spot.

[0007] The present invention has been made to solve the above-mentioned problems, and one of the features of the present invention is The purpose of this is to create a hitting tool that allows anyone to hit the ball accurately at the sweet spot by simply marking it to show the exact sweet spot and the corresponding position to hold the hitting tool. [Means for solving the problem]

[0008] In one aspect of this invention, as shown in Figure 1, the marking is made by clearly marking the sweet spot D and the gripping position H of the implement, where the distance A calculated by the formula I / (m·B) is the sweet spot D from the center of gravity G of the implement, the moment of inertia I around the center of gravity G of the implement, and the mass m of the implement, at the gripping position H, as shown in Figure 2. In this case, the gripping position H of the implement is called the center of impact force (abbreviated as the impact center).

[0009] With the equipment according to the above situation, for example, as shown in Figure 3, if you hold the equipment with both hands so that they straddle the grip position line 1 (5) marked in red on the grip, and you can hit the ball at the position of the sweet spot line 1 (4) marked in red on the sweet spot D at that time, the flight distance will be maximum.

[0010] For example, if the gripping position of the equipment is moved to H2 as shown in Figure 4, this is called a short grip. In this case, the sweet spot corresponding to gripping position H2 moves to D2. Grip position H2 becomes the center of impact force.

[0011] In the case of the implement in the above situation, if the gripping position H of the implement is different, the sweet spot position D will also move as expressed in the above-mentioned relational equation in order for the gripping position H to become the center of impact force. [Brief explanation of the drawings]

[0012] [Figure 1] A diagram showing the relationship between the sweet spot of the bat and grip position. [Figure 2] A diagram showing the sweet spot of the bat and the corresponding grip position and center of impact force. [Figure 3] A diagram showing the grip position of the bat and the center of impact force. [Figure 4] This is a diagram showing the relationship between the sweet spot, grip position, and center of impact force on a bat, which is different from that shown in Figure 2. [Figure 5] This diagram shows a different sweet spot on the bat from that shown in Figure 2, as well as the corresponding grip position and center of impact force. [Figure 6] A diagram showing multiple sweet spots on a bat and the corresponding multiple grip positions and centers of impact. [Figure 7] A diagram showing the sweet spot of the racket and the corresponding grip position and center of impact. [Figure 8] A diagram showing a different sweet spot on the racket from that shown in Figure 7 and the corresponding grip position and center of impact. [Figure 9] A diagram showing multiple sweet spots on a racket and the corresponding multiple grip and impact center positions. DETAILED DESCRIPTION OF THE INVENTION

[0013] In Figure 3, a right-handed batter will grip the bat with their right arm (6) and left arm (7) centered on grip position line 1 (4), which is drawn at position H, which corresponds to the sweet spot D.

[0014] In this situation, hitting the ball (2) at the position of the sweet spot line 1 (4) drawn on the sweet spot D can maximize the flight distance.

[0015] Furthermore, in the case of a baseball bat, the grip position and impact force center H2 as shown in Figure 4 can be depicted by using a grip position line 2 (9) in blue, for example, as shown in Figure 5. The sweet spot position D2 shown in Figure 4, which corresponds to the grip position H2 and is also the impact force center, can be depicted by using a sweet spot line 2 (8) in blue, for example, as shown in Figure 5, to understand the sweet spot position when hitting.

[0016] In a baseball bat, as shown in Figure 6, the different sweet spots D1 and D2 and the gripping positions H1 and H2 that are the center of impact are paired with sweet spot line 1 (4) and gripping position line 1 (5) and the paired sweet spot line 2 (8) and gripping position line 2 (9) in different colors or line styles. This eliminates confusion about the sweet spot even when the gripping position of the tool is changed, allowing the player to hit at a more accurate sweet spot position and maximize the distance traveled when hitting.

[0017] 7, 8 and 9 show examples of a tennis racket.

[0018] As shown in Figure 7, when the center of gravity G of the equipment, the moment of inertia I around the center of gravity G, and the mass m of the equipment are taken, and the racket is held at position H, the distance A calculated by the formula I / (m·B) is the sweet spot D from the center of gravity G, and the sweet spot D and the gripping position H of the equipment are clearly marked as shown in Figure 7. In this case, the gripping position H of the racket is called the center of impact force (abbreviated as the center of impact), just like with a bat.

[0019] With the racket in the above position, for example, as shown in Figure 7, if you hold the racket with one or both hands based on the red grip position / striking center H3 written on the grip, and hit the ball at the center of the red sweet spot line 3 (11) written on the sweet spot D3 at that time, the rebound speed of the ball will be at its maximum.

[0020] In the racket in the above situation, for example, when the player moves to grip position H4 as shown in FIG. 8, the player moves to sweet spot position D4 corresponding to grip position H4.

[0021] In the racket in the above situation, as shown in Figure 9, the different sweet spots D3 and D4 and the racket gripping positions H3 and H4, which are the centers of impact, can be depicted as pairs using different colors or line styles. This eliminates confusion about the sweet spot even when the racket gripping position is changed, allowing the player to strike from a more accurate sweet spot position and maximize the rebound speed of the ball when struck.

[0022] In the embodiment, the grip marks and sweet spot marks are described as grip position line 1 (5), sweet spot line 1 (4), grip position line 2 (9), and sweet spot line 2 (8). Alternatively, any markings (e.g., triangular marks, square marks, circle marks, various concave and convex shapes, etc.) may be used as long as the corresponding grip marks and the corresponding sweet spot marks are the same color, the same thickness, or the same shape. [Explanation of symbols]

[0023] 1...Bat 2. Ball 3...Grip end 4...Sweet Spot Line 1 5...Grip position line 1 6...Arms 7...Arms 8...Sweet Spot Line 2 9...Grip position line 2 10...Racket 11...Sweet Spot Line 3 12...Grip position line 3 13...Sweet Spot Line 4 14...Grip position line 4 15...Rotation direction of moment of inertia G: Center of gravity of the equipment D…Sweet spot I...Moment of inertia of the tool m...mass of the tool H...Grip position / center of force A…Distance between the center of gravity and the sweet spot B: Distance between the center of gravity and the grip position

Claims

1. In hitting equipment for hitting tennis, baseball, and other balls, Grip markings marked at the grip position, A hitting implement having a sweet spot mark marked at the sweet spot position determined by the grip position.

2. 2. The striking implement of claim 1, A hitting implement in which the sweet spot position is determined by the following formula: A=I / (m・B) Formula-1 A: Distance from the center of gravity of the hitting implement to the sweet spot position B: Distance from the center of gravity to the grip position m: Mass of the striking tool I: moment of inertia around the center of gravity

3. 3. A striking implement according to claim 1 or 2, a plurality of said grip indicia marked at a plurality of grip positions; A plurality of sweet spot marks are provided at sweet spots corresponding to the respective grip positions, A striking implement in which the corresponding grip markings and the corresponding sweet spot markings are configured to be the same color, the same thickness, or the same shape.

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