Bat and hitting part

Abstract

To provide a bat capable of improving repulsive force to be generated by reducing energy loss at an elastic member.SOLUTION: A ball hitting part 13 includes a first elastic body 15 coming into contact with a ball B when hitting a ball, and a second elastic body 17 being covered by the first elastic body 15 and having an elastic hysteresis smaller than that of the first elastic body 15. This configuration of combining the second elastic body 17 having the small elastic hysteresis with the first elastic body 15, can improve repulsive force by reducing energy loss of the whole ball hitting part 13, even when suppressing deformation of the ball B by deformation of the first elastic body 15 when hitting the ball.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a bat for ball games having an elastic member in a hitting portion thereof, and to the hitting portion thereof. [Background technology]

[0002] Conventional bats of this type include one that is provided with a ball-hitting portion in which a cylindrical elastic body is integrated with a columnar base member, as described in Patent Document 1, for example.

[0003] In this conventional bat, the elastic body deforms when the ball is hit, suppressing deformation of the ball, and when the elastic body returns to its original shape, it imparts a repulsive force to the ball, thereby improving the flight distance of the ball.

[0004] However, with conventional bats, restricting the deformation of the ball increases the energy loss in the elastic body, limiting the generation of rebound force. As a result, there is a limit to how far the ball can travel with conventional bats. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2003-19236 A Summary of the Invention [Problem to be solved by the invention]

[0006] The problem to be solved was the large energy loss at the ball-hitting area, which limited the generation of rebound force. [Means for solving the problem]

[0007] The present invention relates to The elastic member is attached to the radially outer side of the core material. A bat having a ball-hitting portion, The elastic member is The golf club has a first elastic body that contacts a ball when the ball is hit, and a second elastic body that is covered by the first elastic body and has smaller elastic hysteresis than the first elastic body. The second elastic body is spaced apart from the core material in the radial direction. The bat is its most distinctive feature. Effect of the Invention

[0008] By combining a first elastic body with a second elastic body with small elastic hysteresis, the present invention can reduce energy loss in the entire hitting area and improve repulsion force while suppressing deformation of the ball when hit. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing a bat (Example 1). [Diagram 2] FIG. 2 is a vertical cross-sectional view showing the bat of FIG. 1 (Example 1). [Diagram 3] 3A is a perspective cross-sectional view taken along line III-III in FIG. 2, and FIG. 3B is a transverse cross-sectional view taken along line III-III in FIG. 2 (Example 1). [Figure 4] FIG. 2 is a perspective view of a main part showing a core material of the bat in FIG. 1 (Example 1). [Diagram 5] FIG. 2 is a cross-sectional view of a main part of a bat when hitting a ball (Example 1). [Figure 6] 2 is a graph showing an example of load-deflection characteristics of an elastic member used in the bat of FIG. 1 (Example 1). [Figure 7] 13 is a graph showing another example of the load-deflection characteristics of the elastic member used in the bat of FIG. 1 (Example 1). [Figure 8] FIG. 1 is a perspective view showing a bat (Example 2). [Figure 9] FIG. 9 is a longitudinal sectional view of a main part of the bat shown in FIG. 8 (Example 2). [Figure 10] 9(A) to 9(C) are cross-sectional views taken along line IX-IX in FIG. 9 at the time of hitting a ball (Example 2). [Figure 11] FIG. 11 is a perspective view showing a bat according to a modified example (Example 2). [Figure 12] FIG. 11 is a perspective view showing a bat according to another modified example (Example 2). [Figure 13]FIG. 11 is a perspective view showing a bat according to still another modified example (Example 2). [Figure 14] FIG. 14 is a perspective view showing a second elastic body of the bat of FIG. 13 (Example 2). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The objective of reducing energy loss in the elastic member and improving the generated repulsion force is achieved by a ball-hitting part that combines a first elastic body and a second elastic body that has smaller elastic hysteresis than the first elastic body.

[0011] That is, the ball-hitting portion (13) includes a first elastic body (15) that comes into contact with the ball when hitting the ball, and a second elastic body (17) that is covered by the first elastic body (15) and has smaller elastic hysteresis than the first elastic body (15).

[0012] The second elastic body (17) may be provided only on a portion of the circumference of the ball-hitting portion (13) or may be provided over the entire circumference.

[0013] When the second elastic body (17) is provided over the entire circumferential direction, the second elastic body (17) may be in the form of a ring that is continuous or discontinuous in the circumferential direction.

[0014] Furthermore, when the second elastic body (17) is formed in an annular shape that is discontinuous in the circumferential direction, the second elastic body (17) may include a plurality of elastic pieces (17a) that are discontinuous in the circumferential direction.

[0015] In this case, the multiple elastic pieces (17a) may be cantilevered with one axial end connected to the core material (3) and arranged in a ring shape with slits (17b) between adjacent pieces in the circumferential direction.

[0016] In addition, when the second elastic body (17) is formed in a circumferentially continuous ring shape, it may be cylindrical. However, the second elastic body (17) may also be cylindrical with a polygonal or elliptical cross section.

[0017] The second elastic body (17) may have a corrugated outer surface. The second elastic body (17) may have a flat outer surface.

[0018] A space (21) may be formed on the inner periphery of the second elastic body (17). However, the second elastic body (17) may be embedded in the first elastic body (15). In this case, the space (21) is omitted. EXAMPLES

[0019] [Bat structure] Fig. 1 is a perspective view of a bat according to a first embodiment of the present invention. Fig. 2 is a longitudinal sectional view of the same bat. Fig. 3(A) is a perspective sectional view taken along line III-III in Fig. 2, and Fig. 3(B) is a transverse sectional view taken along line III-III in Fig. 2. Fig. 4 is a perspective view of a main part showing a core material of the bat in Fig. 1.

[0020] Bat 1 of the present embodiment is used for ball games such as baseball and softball, and includes a grip portion 7 and a ball-hitting portion 13.

[0021] The grip portion 7 is a portion that is gripped by a batter, and is made up of a part of the core material 3 .

[0022] The core material 3 is a hollow rod-like body having a circular cross-sectional shape. The cross-sectional shape of the core material 3 is constant from the tip side to the base end side, but it is possible to make it have a different shape by partially changing the diameter, etc. The cross-sectional shape of the core material 3 is not limited to a circle, and other shapes such as an ellipse can be adopted. The material of the core material 3 is fiber reinforced plastic (FRP), and in this embodiment, carbon fiber reinforced plastic (CFRP). The material of the core material 3 is not limited to FRP, and metal, wood, etc. can be used. The core material 3 may be a solid rod.

[0023] The thickness of the core material 3 can be partially thinned or thickened.

[0024] Core material 3 integrally comprises grip portion 7, ball hitting area 9, and head portion 11 from the base end to the tip end in the axial direction. However, any one, two, or all of grip portion 7, ball hitting area 9, and head portion 11 may be configured as separate members, and these separate members may be integrally joined to form core material 3. It is also possible to omit ball hitting area 9 and head portion 11. The axial direction is the direction along the central axis of bat 1.

[0025] The grip portion 7 of this embodiment is formed into a hollow rod shape with a circular cross section in accordance with the shape of the core material 3. A grip tape 7a is wound around the grip portion 7. A grip end 7b that protrudes in the radial direction is integrally provided at the base end of the grip portion 7. However, the grip end 7b may be configured as a separate member from the grip portion 7 and integrally connected to the grip portion 7. A ball-hitting area 9 is integrally provided at the tip of the grip portion 7.

[0026] The ball-hitting area 9 is a part of the core material 3 located on the inner circumference of the ball-hitting portion 13, and is formed into a hollow rod shape having a circular cross section. The cross section of the ball-hitting area 9 is not limited to a circular shape, and other shapes are also possible. For example, the cross section of the ball-hitting area 9 may be an elliptical shape or an asymmetric shape between one radial side and the other radial side with respect to the center of the ball-hitting area 13. A head portion 11 is provided integrally with the tip side of the ball-hitting area 9.

[0027] Head portion 11 is formed in a hollow disk shape. However, head portion 11 does not have to be hollow. Head portion 11 bulges in the radial direction relative to ball-hitting area 9. The outer diameter of head portion 11 is approximately the same as the outer diameter of ball-hitting portion 13.

[0028] The ball hitting portion 13 is configured by attaching an elastic member 5 to the ball hitting portion region 9 of the core material 3. The ball hitting portion 13 of this embodiment can also be applied to a bat that does not have a ball hitting portion region 9. In this case, the ball hitting portion 13 can be configured by axially joining the elastic member 5 to the grip portion 7 of the core material 3. The ball hitting portion 13 can also be applied to a bat in which a portion of the ball hitting portion region 9 is omitted. For example, a portion of the ball hitting portion region 9 located on the tip side of the portion to which the second elastic body 17 described below is joined is omitted from the core material 3.

[0029] The elastic member 5 is capable of suppressing deformation of the ball B (see FIG. 6) by its own deformation when hitting the ball, and of applying a repulsive force to the ball B. The elastic member 5 of this embodiment is more easily deformed than the core material 3 when hitting the ball, and includes a first elastic body 15 and a second elastic body 17.

[0030] The first elastic body 15 is a portion that comes into contact with the ball B when hitting the ball. In this embodiment, the first elastic body 15 is a hollow cylinder, and covers the entire ball hitting area 9 of the core material 3. The first elastic body may cover only a portion of the ball hitting area 9. For example, it is also possible to provide the first elastic body 15 only on one radial side of the ball hitting area 9 in the cross section. In this case, the first elastic body 15 does not need to be cylindrical.

[0031] The tip of the first elastic body 15 abuts against the head portion 11 of the core material 3, and the base end is prevented from coming off by a collar 19. In this state, the first elastic body 15 is fixed to the core material 3 by an appropriate fixing means such as an adhesive.

[0032] The first elastic body 15 deforms when hit, thereby suppressing deformation of the ball B and generating a repulsive force against the ball B. The first elastic body 15 of this embodiment is made of foamed polyurethane resin, which is a thermoplastic elastomer, and suppresses deformation of the ball B by compressive deformation and bending when hit. The first elastic body 15 generates a repulsive force against the ball B when it is restored after deformation. The material of the first elastic body 15 may be any material that can suppress deformation of the ball B, and may be appropriately set in relation to the ball B, etc. For example, the material of the first elastic body 15 may be FRP, metal, etc.

[0033] In this embodiment, the first elastic body 15 has an outer diameter that gradually increases from the base end toward the tip end, and the outer diameter becomes almost constant at the tip end. The part of the first elastic body 15 where the outer diameter is almost constant is the sweet region 13a of the ball-hitting portion 13, and the second elastic body 17 is located inside. Alternatively, a recess may be provided in part of the ball-hitting portion region 9 of the core material 3, and the first elastic body 15 may be provided only within the recess.

[0034] The surface of the first elastic body 15 is covered with a surface layer (not shown). The surface layer is formed in a cylindrical film shape made of a thermoplastic resin such as a polyurethane film. The surface layer may be omitted.

[0035] Second elastic body 17 is covered by first elastic body 15 in sweet region 13a of ball-hitting portion 13. The configuration in which second elastic body 17 is covered by first elastic body 15 may be such that second elastic body 17 is not exposed to the outside, or may be such that second elastic body 17 is partially exposed to the outside in the circumferential direction. In this embodiment, second elastic body 17 is configured so as not to be exposed to the outside, and is positioned so as not to form an outer surface of bat 1 that is exposed to the outside.

[0036] The second elastic body 17 is made of an elastic body having smaller elastic hysteresis than the first elastic body 15. The second elastic body 17 deforms when hitting the ball, generating a repulsive force with little energy loss. The elastic hysteresis of the second elastic body 17 can be appropriately set by changing the material, shape, etc.

[0037] In this embodiment, the second elastic body 17 is integrally formed with the core material 3 and made of FRP, which is the same material. The second elastic body 17 can also be made of other resins, metals, wood, etc., depending on the material of the first elastic body 15. If the second elastic body 17 is made of a different material than the core material 3, it can be fixed to the core material 3 by an appropriate fixing means, such as adhesive. If part or all of the ball-hitting area 9 of the core material 3 is omitted, the second elastic body 17 may be made of the same material as the core material 3, but it is easier to make the second elastic body 17 of a different material than the core material 3.

[0038] The second elastic body 17 of this embodiment is configured in a ring shape that is discontinuous in the circumferential direction. Specifically, the second elastic body 17 includes a plurality of elastic pieces 17a that are discontinuous in the circumferential direction. Each of the plurality of elastic pieces 17a is cantilevered with a base end side, which is one side in the axial direction, connected to the core material 3, and is arranged in a ring shape with slits 17b between adjacent pieces in the circumferential direction.

[0039] Therefore, when the second elastic body 17 hits the ball, the elastic piece 17a bends with the base end side as a fulcrum, generating a repulsive force against the ball B. The elastic pieces 17a may be cantilevered with the tip side integrally connected to the core material 3 as one of the axial sides. The elastic piece 17a may also be shaped such that both sides in the axial direction are connected to the core material 3. Furthermore, the elastic piece 17a may be shaped such that both sides in the axial direction are separated from the core material 3. In this case, the elastic piece 17a may be attached to the first elastic body 15. The elastic piece 17a does not need to be arranged in a ring shape, and may be provided only in a part of the circumferential direction. In this case, the number of elastic pieces 17a may be one.

[0040] The elastic pieces 17a of this embodiment are formed in an arc shape with the same center of curvature so that the elastic pieces 17a are located on a circle as a whole in cross section. The elastic pieces 17a may have a larger or smaller radius of curvature or a curvature in the opposite direction so as to have different centers of curvature. The elastic pieces 17a may also be flat plate-like rather than arc-like. Furthermore, the width of the elastic pieces 17a can be changed regardless of whether they are arc-like or not. In this case, the elastic pieces 17a may be linear, for example.

[0041] In addition, the shape of the elastic piece 17a can be changed in the longitudinal direction. For example, the elastic piece 17a may not only have a constant shape in the longitudinal direction, but may also be wavy, gradually curved toward the base end or the tip end, or gradually enlarged or reduced in longitudinal or transverse cross section toward the base end or the tip end, or may be configured by a combination of these.

[0042] The elastic piece 17a is radially separated from the core material 3 by a tapered portion 17c on the base end side in the axial direction. As a result, the outer surface of the elastic piece 17a is in radial contact with the inner surface of the first elastic body 15. Also, a space 21 is formed on the inner periphery of the elastic piece 17a in the radial direction. The space 21 allows the elastic piece 17a to bend when hitting a ball.

[0043] [Bat Action] FIG. 5 is a cross-sectional view of a main part of the bat when hitting a ball.

[0044] In bat 1 of the present embodiment, when hitting a ball with hitting portion 13, deformation of elastic member 5 suppresses deformation of ball B and generates a repulsive force against ball B.

[0045] That is, in the elastic member 5, the first elastic body 15 is pressed in the radial direction by the ball B, and the pressed portion of the first elastic body 15 is compressed and curved along the ball B. This bending of the first elastic body 15 presses the second elastic body 17 (elastic piece 17a) in the radial direction. The pressed second elastic body 17 curves so as to enter the space portion 21 with the base end side as a fulcrum.

[0046] Therefore, the elastic member 5 suppresses deformation of the ball B at the time of hitting due to the deformation of the first elastic body 15 and the second elastic body 17. In addition, the elastic member 5 generates a repulsive force against the ball B when the deformed first elastic body 15 and second elastic body 17 are restored to their original state.

[0047] This repulsive force is a resultant force of the repulsive force of the first elastic body 15 and the repulsive force of the second elastic body 17, which has smaller elastic hysteresis (less energy loss). Therefore, in this embodiment, the energy loss of the elastic member 5 (ball-hitting portion 13) as a whole can be reduced, and the repulsive force can be improved. As a result, in this embodiment, it is possible to improve the flight distance of the ball.

[0048] [Load-deflection characteristics] FIG. 6 is a graph showing an example of the load-deflection characteristics of the elastic member used in the bat of FIG.

[0049] Example 1, Comparative Example, and the first and second elastic bodies in Figure 6 show the load-deflection characteristics of the increase and decrease in the amount of deflection when the applied load is increased and decreased, respectively. In Figure 6, Example 1 shows the characteristics of elastic member 5 of bat 1. The Comparative Example in Figure 6 shows the characteristics of an elastic member in which the elastic body from the outer surface of the ball-hitting portion to the core material is made of the same material as first elastic body 15. Furthermore, the first elastic body and second elastic body in Figure 6 show the characteristics of first elastic body 15 alone and second elastic body 17 alone in Example 1, respectively.

[0050] 6, the area of ​​the region surrounded by the load-deflection curve when the load is increased and decreased is smaller in Example 1 than in the Comparative Example. That is, Example 1 has smaller elastic hysteresis than the Comparative Example, and the energy loss when elastic member 5 of ball-hitting portion 13 deforms and restores is smaller.

[0051] This is because the second elastic body 17, which has small elastic hysteresis (in this embodiment, it has linear characteristics with almost no elastic hysteresis), is combined with the first elastic body 15 to reduce the overall elastic hysteresis, and further, the proportion of the first elastic body 15 that accounts for the elastic member 5 (ball-hitting portion 13) is reduced, so that the elastic hysteresis of the first elastic body 15 alone is also smaller than in the comparative example.

[0052] Fig. 7 is a graph showing another example of the load-deflection characteristics of the elastic member used in the bat of Fig. 1. Example 1, Comparative Example, first elastic body, and second elastic body of Fig. 7 are the same as those of Fig. 6.

[0053] In the example of Fig. 7, the load value at the maximum deflection of the second elastic body 17 of Example 1 is made smaller than that in the example of Fig. 6. As a result, in the example of Fig. 7, the elastic hysteresis is reduced while the characteristics similar to those of the first elastic body 15 are obtained up to about half of the maximum deflection.

[0054] In the initial stage of the collision of the ball B with the bat 1, it is preferable that the amount of deflection relative to the load is large in order to suppress deformation of the ball. Also, in order to increase the repulsive force, it is preferable that the load relative to the maximum amount of deflection is large and the elastic hysteresis is small. In this case, when the load increases as the ball B collides with the bat 1, the characteristics of the first elastic body 15 are suitable, but when the load decreases as the ball B leaves the bat 1, the characteristics of the first elastic body 15 with large elastic hysteresis are not suitable.

[0055] Therefore, in this embodiment, the first elastic body 15 and the second elastic body 17 are combined, and as described above, the characteristics of the first elastic body 15 are obtained while the elastic hysteresis is reduced.

[0056] The load-deflection characteristics of the elastic member 5 are such that the load value is high for a bat for a strong hitter and the load value is low for a bat for a weaker hitter. The load value of the elastic member 5 can be set by either or both of the load values ​​of the first elastic body 15 and the second elastic body 17.

[0057] [Effects of Example 1] As described above, the bat 1 of this embodiment has a hitting portion 13 which includes a first elastic body 15 that contacts the ball B when hitting the ball, and a second elastic body 17 which is covered by the first elastic body 15 and has smaller elastic hysteresis than the first elastic body 15.

[0058] Therefore, in this embodiment, by combining the first elastic body 15 with the second elastic body 17 having small elastic hysteresis, it is possible to reduce the energy loss of the entire ball-hitting portion 13 and improve the repulsive force even if the deformation of the ball B at the time of hitting is suppressed. As a result, in this embodiment, the flight distance of the ball is improved.

[0059] Furthermore, in this embodiment, since second elastic body 17 has a discontinuous annular shape in the circumferential direction, the flight distance of the hit ball can be improved over the entire circumference of bat 1.

[0060] The second elastic body 17 has a plurality of elastic pieces 17a that are discontinuous in the circumferential direction. The elastic pieces 17a in this embodiment are cantilevered with their axial base ends connected to the core material 3, and are arranged in a ring shape with slits 17b between adjacent pieces in the circumferential direction.

[0061] Therefore, in this embodiment, the second elastic body 17 having smaller elastic hysteresis than the first elastic body 15 can be easily realized by the elastic piece 17a that curves with the base end side as a fulcrum.

[0062] In addition, in this embodiment, since the space 21 is formed on the inner periphery of the second elastic body 17, the elastic piece 17a is allowed to bend, and the second elastic body 17 can be smoothly deformed and restored. As a result, in this embodiment, the flight distance of the ball can be more reliably improved. EXAMPLES

[0063] Fig. 8 is a perspective view showing a bat according to a second embodiment of the present invention, and Fig. 9 is a longitudinal sectional view showing a main part of the bat shown in Fig. 8. In the second embodiment, the same reference numerals are used to designate components corresponding to those in the first embodiment, and duplicated explanations will be omitted.

[0064] Bat 1 of this embodiment has second elastic body 17 of ball hitting portion 13 in a circumferentially continuous ring shape. Note that, like in Example 1, ball hitting portion 13 is applicable not only to core material 3 having ball hitting portion region 9, but also to core material 3 in which part or all of ball hitting portion region 9 is omitted.

[0065] The second elastic body 17 is made of a metal such as stainless steel and is formed into a cylindrical shape. The second elastic body 17 may be made of FRP as in the first embodiment. The second elastic body 17 is embedded in the first elastic body 15. As a result, the second elastic body 17 is inserted through the core material 3 and is arranged concentrically.

[0066] However, the second elastic body 17 may be disposed eccentrically with respect to the core material 3. In this case, it is also possible to dispose the annular second elastic body 17 only on one side of the cross section of the core material 3, and not to insert the core material 3 through the second elastic body 17.

[0067] In this embodiment, first elastic body 15 is provided from the outer surface of hitting portion 13 in the radial direction to core material 3. Therefore, first elastic body 15 is also located between second elastic body 17 and core material 3, and a configuration is provided in which there is no space. However, a space may be formed between second elastic body 17 and core material 3, similar to that of embodiment 1.

[0068] The axial length, thickness, and diameter of second elastic body 17 can be set appropriately depending on the characteristics required of bat 1. Second elastic body 17 in this embodiment has a constant inner and outer diameter, but the diameter may be gradually smaller or larger from the base end side to the tip end side, for example.

[0069] The rest is the same as in Example 1. However, in this example, an inclined portion 23 is provided between the ball-hitting region 9 and the head portion 11 of the core material 3. The outer diameter of the inclined portion 23 gradually increases from the ball-hitting region 9 toward the head portion 11. The inclined portion 23 may be applied to the core material 3 of Example 1.

[0070] 10(A) to 10(C) are cross-sectional views taken along line XX in FIG. 9 at the time of hitting the ball.

[0071] In bat 1 of the present embodiment, when a ball is hit, first elastic body 15 is compressed radially inward and outward of second elastic body 17, and second elastic body 17 is deflected to assume an elliptical cross section.

[0072] Therefore, the elastic member 5 suppresses the deformation of the ball B at the time of hitting due to the deformation of the first elastic body 15 and the second elastic body 17. Furthermore, when the deformed first elastic body 15 and second elastic body 17 are restored, the elastic member 5 can generate a repulsive force against the ball B while reducing energy loss, similar to the first embodiment.

[0073] This embodiment can also achieve the same effects as those of embodiment 1. In addition, in this embodiment, since second elastic body 17 has a cylindrical shape that is continuous in the circumferential direction, the flight distance of the ball can be improved more reliably around the entire circumference of bat 1.

[0074] In addition, in this embodiment, since the second elastic body 17 is embedded in the first elastic body 15, the first elastic body 15 and the second elastic body 17 can be handled as a single unit.

[0075] Fig. 11 is a perspective view of a bat according to a modified example, Fig. 12 is a perspective view of a bat according to another modified example, Fig. 13 is a perspective view of a main part of a bat according to still another modified example, and Fig. 14 is a perspective view of a second elastic body of the bat in Fig. 13.

[0076] In the modified example of Fig. 11, the axial dimension of the second elastic body 17 is made longer than that of Fig. 8. In the modified example of Fig. 12, a plurality of second elastic bodies 17 are provided in the axial direction. Note that, although the axial dimension of the plurality of second elastic bodies 17 is the same in Fig. 12, the axial dimension of the plurality of second elastic bodies 17 may be made different.

[0077] 13 and 14, the second elastic body 17 is formed to have a corrugated cross section. The second elastic body 17 has peaks 25 and valleys 27 alternating in the circumferential direction. This gives the second elastic body 17 a corrugated outer surface.

[0078] With respect to the peaks 25 and valleys 27 of the second elastic body 17, the peaks 25 are deformed so as to be crushed when the ball is hit, and the valleys 27 are deformed so as to be expanded when the ball is hit.

[0079] A plurality of second elastic bodies 17 are provided in the axial direction of core material 3. When a plurality of second elastic bodies 17 are provided, it is preferable to arrange all of second elastic bodies 17 within sweet region 13a of ball-hitting portion 13. However, it is also possible to configure bat 1 so that second elastic bodies 17 are arranged outside sweet region 13a and the flight distance can be ensured even when the second elastic bodies 17 are outside sweet region 13a. [Explanation of symbols]

[0080] 1 Bat 3 Core material 5 Elastic member 13 Batting Club 15 First Elastic Body 17 Second Elastic Body 17a Elastic piece 17b Slit 21 Space section

Claims

1. A bat having a ball-hitting portion including a core material and an elastic member attached to the radially outer side of the core material, The elastic member is a first elastic body that contacts the ball when hit; a second elastic body that is covered with the first elastic body and has an elastic hysteresis smaller than that of the first elastic body; Equipped with The second elastic body is spaced apart from the core material in the radial direction. bat.

2. 2. The bat of claim 1, The second elastic body is annular and continuous or discontinuous in the circumferential direction. bat.

3. 3. The bat of claim 2, The second elastic body includes a plurality of elastic pieces that are discontinuous in the circumferential direction. bat.

4. A bat having a ball-hitting portion, The hitting portion is a first elastic body that contacts the ball when hit; a second elastic body that is covered with the first elastic body and has an elastic hysteresis smaller than that of the first elastic body; Equipped with The second elastic body includes a plurality of elastic pieces that are discontinuous in a circumferential direction, The plurality of elastic pieces are each cantilevered with one axial side connected to the core material, and are arranged in a ring shape with slits between adjacent elastic pieces in the circumferential direction. bat.

5. 3. The bat of claim 2, The second elastic body has a cylindrical shape that is continuous in the circumferential direction. bat.

6. The bat according to any one of claims 2 to 5, The second elastic body has a corrugated outer surface. bat.

7. The bat according to any one of claims 1 to 3 and 5, a space formed between the second elastic body and the core material in the radial direction, bat.

8. The bat according to any one of claims 1 to 3 and 5, The second elastic body is embedded in the first elastic body, the first elastic body covers the second elastic body and is located between the second elastic body and the core material in the radial direction; bat.

9. A ball-hitting portion of a bat having a core and an elastic member attached to a radially outer side of the core, The elastic member is a first elastic body that contacts the ball when hit; a second elastic body that is covered with the first elastic body and has an elastic hysteresis smaller than that of the first elastic body; Equipped with The second elastic body is spaced apart from the core material in the radial direction. Hitting club.

10. The ball-hitting portion according to claim 9, The second elastic body is annular and continuous or discontinuous in the circumferential direction. Hitting club.

11. The ball striking portion according to claim 10, The second elastic body includes a plurality of elastic pieces that are discontinuous in the circumferential direction. Hitting club.

12. A ball-hitting portion for a bat, a first elastic body that contacts the ball when hit; a second elastic body that is covered with the first elastic body and has an elastic hysteresis smaller than that of the first elastic body; Equipped with The second elastic body includes a plurality of elastic pieces that are discontinuous in a circumferential direction, The plurality of elastic pieces are each cantilevered with one axial side connected to a core material of the bat, and are arranged in a ring shape with slits between adjacent elastic pieces in the circumferential direction. Hitting club.

13. The ball striking portion according to claim 10, The second elastic body has a cylindrical shape that is continuous in the circumferential direction. Hitting club.

14. The ball-hitting portion according to any one of claims 10 to 13, The second elastic body has a corrugated outer surface. Hitting club.

15. The ball-hitting portion according to any one of claims 9 to 11 and 13, a space formed between the second elastic body and the core material in the radial direction, Hitting club.

16. The ball-hitting portion according to any one of claims 9 to 11 and 13, The second elastic body is embedded in the first elastic body, the first elastic body covers the second elastic body and is located between the second elastic body and the core material in the radial direction; Hitting club.

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