racket

Abstract

We offer a racket that allows for fine-tuning of the racket's balance using weight parts. [Solution] The racket comprises a handle portion, a main body portion 2 to which the handle portion is connected, and a weight part 3 that is movable along the periphery of the main body portion. The weight part is configured to move continuously along the periphery of the main body portion. The main body portion includes a rail portion 21 provided on its periphery. The rail portion includes a pair of flange portions 21a and a wall portion 21c. The wall portion includes a pair of side walls 21c1, a bottom portion 21c2, and an opening 21c3. The weight part includes an upper portion 31 and a screw portion 32. The screw portion includes a head portion 32a and a shaft portion 32b. When the screw portion is tightened, the upper portion is fixed to the pair of flange portions, and when the screw portion is loosened, the upper portion becomes movable relative to the pair of flange portions.

Description

Technical Field

[0001] The present invention relates to a racket.

Background Art

[0002] Conventionally, there is a racket for hitting a ball. For example, U.S. Patent Application Publication No. 2023 / 249042 describes a racket used for a pickle ball. The racket described in this publication is configured to be able to adjust the weight by adding or reducing weight components.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the racket described in the above publication, the attachment positions of the weight components are intermittently arranged on the peripheral edge of the main body of the racket. Therefore, since the attachment positions of the weight components are divided, it is difficult to finely adjust the balance of the racket by the weight components.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a racket capable of finely adjusting the balance of the racket by weight parts.

Means for Solving the Problems

[0006] The racket of the present invention comprises a handle portion, a main body portion to which the handle portion is connected, and a weight part that is movable along the periphery of the main body portion. The weight part is configured to be continuously movable along the periphery of the main body portion. The main body portion includes a rail portion provided on its periphery. The weight part is configured to be movable along the rail portion and to be fixed to the main body portion when it is moved along the rail portion. The rail portion includes a pair of flange portions and a wall portion. The wall portion includes a pair of side walls, a bottom portion, and an opening. Each of the pair of flange portions is positioned between the bottom portion and the opening, protruding from each of the pair of side walls in directions opposite to each other, spaced apart from each other, and positioned at the ends of the pair of side walls. The weight part includes an upper portion and a screw portion. The corners of the upper portion facing each of the pair of flange portions and each of the pair of side walls are configured to be right angles. The screw portion includes a head portion and a shaft portion. The tip of the shaft portion is capable of contacting the bottom portion. When the screw is tightened, the upper part is fixed to the pair of flanges, and when the screw is loosened, the upper part becomes movable relative to the pair of flanges. [Effects of the Invention]

[0007] The present invention provides a racket that allows for fine adjustment of the racket's balance using weight parts.

[0008] The above and other objects, features, embodiments and advantages of the present invention will become more apparent from the following detailed description of the invention in conjunction with the accompanying drawings. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic front view showing the configuration of the racket according to Embodiment 1. [Figure 2] This is a perspective view showing a schematic configuration of the racket according to Embodiment 1. [Figure 3] This is a left side view schematicly showing the configuration of the racket according to Embodiment 1. [Figure 4] This is a schematic cross-sectional view showing the configuration of the main body and weight parts of the racket according to Embodiment 1. [Figure 5] This is a perspective view schematically showing the configuration of the weight parts of the racket according to Embodiment 1. [Figure 6] This is a cross-sectional view along the line VI-VI in Figure 5. [Figure 7] This is a schematic cross-sectional view showing the configuration of the main body and weight parts in a modified example of the racket according to Embodiment 1. [Figure 8] This is a perspective view showing a schematic configuration of the racket according to Embodiment 2. [Figure 9] This is a left side view schematicly showing the configuration of the racket according to Embodiment 2. [Figure 10] This is a perspective view showing a schematic configuration of the racket according to Embodiment 3. [Figure 11] This is a left side view schematicly showing the configuration of the racket according to Embodiment 3. [Figure 12] This is a perspective view showing a schematic configuration of the racket according to Embodiment 4. [Figure 13] This is a left side view schematicly showing the configuration of the racket according to Embodiment 4. [Figure 14] This is a perspective view showing a schematic configuration of the racket according to Embodiment 5. [Figure 15] This is a left side view schematicly showing the configuration of the racket according to Embodiment 5. [Figure 16] This is a left side view schematicly showing the configuration of the racket according to Embodiment 6. [Figure 17] This is a left side view schematicly showing the configuration of the racket according to Embodiment 7. [Figure 18] This is a schematic cross-sectional view showing the configuration of the main body and weight parts of the racket according to Embodiment 8. [Modes for carrying out the invention]

[0010] Hereinafter, embodiments of the present invention will be described based on the drawings. Unless otherwise specified, the same or corresponding parts in the following drawings are denoted by the same reference numerals, and their descriptions will not be repeated.

[0011] (Embodiment 1) Referring to FIGS. 1 to 7, the configuration of the racket 100 according to Embodiment 1 will be described. The racket according to Embodiment 1 is a pickleball racket (pickleball paddle).

[0012] As shown in FIGS. 1 and 2, the racket 100 according to Embodiment 1 includes a handle portion 1, a main body portion 2, and a weight part 3. The handle portion 1 is the part that the user grips. The handle portion 1 extends in the longitudinal direction of the racket 100.

[0013] The main body portion 2 is connected to the handle portion 1. The handle portion 1 and the main body portion 2 are arranged side by side in the longitudinal direction of the racket 100. The longitudinal direction of the racket 100 coincides with the length direction of the main body portion 2. The short direction of the racket 100 coincides with the width direction of the main body portion 2.

[0014] The main body portion 2 is configured in a flat plate shape. The main body portion 2 has a hitting surface S for hitting the ball. The front and back surfaces of the main body portion 2 constitute the hitting surface S. The inside of the main body portion 2 has, for example, a honeycomb structure or a foam. The material of the hitting surface S of the main body portion 2 is, for example, carbon fiber reinforced plastic (CFRP). The material inside the main body portion 2 is, for example, polypropylene (PP).

[0015] The main body portion 2 includes a pair of straight portions arranged at both ends in the width direction, a base portion connected to the handle portion 1, a pair of base-side inclined portions connecting each of the pair of straight portions and the base portion, a ceiling portion arranged on the side opposite to the base portion, and a pair of tip-side inclined portions connecting the pair of straight portions and the ceiling portion.

[0016] The weight part 3 is configured to move continuously along the periphery of the main body 2. The material of the weight part 3 is, for example, stainless steel (SUS304, SUS630), nickel-tungsten alloy (Ni-W), etc. The material of the weight part 3 may be a metal or resin with a different specific gravity. The weight part 3 may be placed on one side of the main body 2, or on multiple sides. Multiple weight parts 3 may be placed on one side of the main body 2. There may be only one weight part 3.

[0017] In this embodiment, the racket 100 is equipped with two weight parts 3. Each of the two weight parts 3 is positioned at both ends of the main body 2 in the width direction. Each of the two weight parts 3 is configured to be continuously movable along the peripheral edge of the main body 2 at both ends of the main body 2 in the width direction.

[0018] As shown in Figures 2 and 3, each of the two weight parts 3 is configured to be linearly movable toward the tip and base of the main body 2 at both ends in the width direction of the main body 2.

[0019] The main body 2 includes a rail section 21. The rail section 21 is provided on the periphery of the main body 2. The rail section 21 is configured to allow the weight part 3 to move continuously by sliding it. The material of the rail section 21 is, for example, resin. Examples of resins include thermoplastic polyurethane (TPU), polycarbonate (PC), polypropylene (PP), acrylonitrile butadiene styrene copolymer synthetic resin (ABS), and fiber-reinforced plastic (FRP).

[0020] In this embodiment, the rail section 21 is provided along the side surface of the main body section 2. The rail section 21 is located at both ends of the main body section 2 in the width direction. The rail section 21 extends linearly from the tip side to the base side of the main body section 2 at both ends of the main body section 2 in the width direction. The rail section 21 is located on a pair of straight sections of the main body section 2.

[0021] The weight part 3 is configured to be movable along the rail section 21. The weight part 3 is configured to slide along the rail section 21. In this embodiment, the weight part 3 is configured to be movable by sliding linearly along the rail section 21 from the tip side to the base side of the main body section 2 at both ends in the width direction of the main body section 2.

[0022] The weight part 3 is configured to be fixed to the main body 2 while it is moving along the rail section 21. The weight part 3 is configured to be fixed to the main body 2 while it is moving to any position along the rail section 21. In this embodiment, the weight part 3 is configured to be fixed to the main body 2 while it is moving by sliding linearly along the rail section 21 from the front end to the base end of the main body 2 at both ends of the main body 2 in the width direction.

[0023] The main body 2 includes a sealing portion 22. The sealing portion 22 seals both ends of the rail portion 21 along the periphery of the main body 2. Therefore, the weight parts 3 cannot be removed from both ends of the rail portion 21. In this embodiment, the weight parts 3 are attached to the rail portion 21 before the rail portion 21 is bonded to the main body 2. Since the rail portion 21 is embedded in the main body of the main body 2, the weight parts 3 cannot be removed from the rail portion 21.

[0024] As shown in Figures 3 and 4, the rail section 21 includes a flange section 21a, a claw section 21b, and a wall section 21c. The wall section 21c is configured in a substantially U-shape. The wall section 21c includes a pair of side walls 21c1, a bottom section 21c2, and an opening 21c3. In this embodiment, the rail section 21 includes a pair of flange sections 21a. Each of the pair of flange sections 21a is positioned between the bottom section 21c2 and the opening 21c3. Each of the pair of flange sections 21a protrudes from each of the pair of side walls 21c1 in directions opposite to each other. Each of the pair of flange sections 21a is spaced apart from each other. The pair of flange sections 21a are provided continuously across both ends of the rail section 21. The weight part 3 is positioned on the rail section 21. The weight part 3 is held by the flange section 21a.

[0025] In this embodiment, the rail portion 21 includes a pair of claw portions 21b. The pair of claw portions 21b are configured to sandwich the front and back surfaces of the main body portion 2. The pair of claw portions 21b are configured to engage with the front and back surfaces of the main body portion 2.

[0026] As shown in Figures 4 and 5, the weight part 3 includes an upper portion 31, a screw portion 32, and a bottom portion 33. The weight part 3 is configured to be fixed to the rail portion 21 by tightening the screw portion 32 with the upper portion 31 and the bottom portion 33 sandwiching a pair of flange portions 21a.

[0027] The upper portion 31 includes an upper base portion 31a and a through hole 31b provided in the upper base portion 31a. The screw portion 32 includes a head portion 32a and a shaft portion 32b. The diameter of the head portion 32a is larger than the diameter of the shaft portion 32b. The diameter of the head portion 32a is larger than the diameter of the through hole 31b. The shaft portion 32b is provided with screw threads. The bottom portion 33 includes a bottom base portion 33a and a through hole 33b provided in the bottom base portion 33a. The through hole 33b is provided with a screw groove that can be screwed into the screw threads of the shaft portion 32b.

[0028] The screw portion 32 connects the upper portion 31 and the bottom portion 33. The upper portion 31 and the bottom portion 33 are sandwiched between a pair of flange portions 21a. The screw portion 32 is configured to change the distance between the upper portion 31 and the bottom portion 33. Specifically, when the screw portion 32 is tightened, the distance between the upper portion 31 and the bottom portion 33 in the axial direction of the shaft portion 32b of the screw portion 32 is narrowed. As a result, the upper portion 31 and the bottom portion 33 are fixed to the pair of flange portions 21a while the upper portion 31 and the bottom portion 33 are tightened against the pair of flange portions 21a.

[0029] On the other hand, when the screw portion 32 is loosened, the gap between the upper portion 31 and the bottom portion 33 in the axial direction of the shaft portion 32b of the screw portion 32 widens. As a result, the upper portion 31 and the bottom portion 33 can move relative to the pair of flange portions 21a without tightening them. The weight part 3 is then moved along the pair of rail portions 21 to any desired position, and the screw portion 32 is tightened again to fix the weight part 3 in that position. In this way, the weight part 3 can be adjusted to any desired position relative to the rail portion 21.

[0030] As shown in Figures 5 and 6, the upper portion 31 includes a protrusion 31c. The protrusion 31c is located at one end of the upper base portion 31a. The protrusion 31c extends toward the bottom portion 33. The bottom portion 33 includes a recess 33c. The recess 33c is located at one end of the bottom portion 33. The recess 33c is recessed on the side opposite to the upper portion 31. The recess 33c is configured to receive the protrusion 31c. The engagement of the protrusion 31c and the recess 33c suppresses misalignment between the upper portion 31 and the bottom portion 33.

[0031] Next, a modified example of the racket 100 according to Embodiment 1 will be described. As shown in Figure 7, the rail portion 21 in the modified version of the racket 100 according to Embodiment 1 does not include a pair of claw portions 21b. Therefore, the narrowing of the hitting surface S by the pair of claw portions 21b of the rail portion 21 is suppressed. Consequently, the hitting surface S can be widened.

[0032] Next, the effects and advantages of the racket 100 according to Embodiment 1 will be described. According to the racket 100 of Embodiment 1, the weight part 3 is configured to be continuously movable along the periphery of the main body 2. Therefore, by continuously moving the weight part 3 along the periphery of the main body 2, the weight part 3 can be moved to any position. In other words, the weight part 3 can be moved to a precise position. Thus, the balance of the racket 100 can be finely adjusted by the weight part 3.

[0033] Furthermore, the weight part 3 can be just one piece. This allows the weight part 3 to be concentrated on one side of the racket 100. As a result, the performance when hitting the ball can be changed depending on whether the front or back of the main body 2 is used.

[0034] Furthermore, the material of weight part 3 may be a metal or resin with a different specific gravity. This allows for a change in the adjustable balance range.

[0035] Furthermore, multiple weight parts 3 may be arranged on one side of the main body 2. This allows for a wider range of balance adjustment. It also enables settings with the same balance but different moments of inertia. Conversely, it enables settings with the same moment of inertia but different balances.

[0036] According to the racket 100 of Embodiment 1, the weight part 3 is configured to be movable along the rail portion 21. Therefore, the weight part 3 can be moved along the rail portion 21. Consequently, by moving the weight part 3 along the rail portion 21, the weight part 3 can be moved to any position.

[0037] Furthermore, the material of the rail section 21 may be fiber-reinforced plastic (FRP). This makes it possible to increase the strength of the rail section 21.

[0038] In the racket 100 according to Embodiment 1, the weight part 3 is configured to be fixed to the main body 2 while moving along the rail portion 21. Therefore, by fixing the weight part 3 to the main body 2 while it is moving along the rail portion 21, the weight part 3 can be fixed at any position. Consequently, the weight part 3 does not move even when the user swings the racket 100.

[0039] According to the racket 100 of Embodiment 1, the sealing portion 22 seals both ends of the rail portion 21 along the periphery of the main body portion 2. This prevents the weight parts 3 from coming off both ends of the rail portion 21.

[0040] (Embodiment 2) Unless otherwise specified, the racket 100 according to Embodiment 2 has the same structure and effects as the racket 100 according to Embodiment 1.

[0041] Referring to Figures 8 and 9, the configuration of the racket 100 according to Embodiment 2 will be described. In the racket 100 according to Embodiment 2, the rail portion 21 is arranged along the entire periphery of the main body portion 2. Therefore, the weight part 3 is configured to be movable along the rail portion 21 to all positions on the periphery of the main body portion 2. In this embodiment, both ends of the rail portion 21 are not sealed. In other words, both ends of the rail portion 21 are open.

[0042] Next, the effects and advantages of the racket 100 according to Embodiment 2 will be described. According to the racket 100 of Embodiment 2, the weight part 3 is configured to be movable along the rail portion 21 to the entire peripheral edge of the main body portion 2. Therefore, the weight part 3 can be moved to all positions on the peripheral edge of the main body portion 2 along the rail portion 21. Consequently, the weight part 3 can be moved to any position on the entire peripheral edge of the main body portion 2.

[0043] Furthermore, since both ends of the rail section 21 are not sealed, the weight parts 3 can be removed from both ends of the rail section 21. Therefore, the weight of the weight parts 3 can be changed by adding, removing, or replacing the weight parts 3 from both ends of the rail section 21.

[0044] (Embodiment 3) Unless otherwise specified, the racket 100 according to Embodiment 3 has the same structure and effects as the racket 100 according to Embodiment 2.

[0045] Referring to Figures 10 and 11, the configuration of the racket 100 according to Embodiment 3 will be described. In the racket 100 according to Embodiment 3, sealing portions 22 are provided at both ends of the rail portion 21 which is arranged around the entire periphery of the main body portion 2. The sealing portions 22 seal both ends of the rail portion 21 at the base end of the main body portion 2.

[0046] Next, the effects and advantages of the racket 100 according to Embodiment 3 will be described. In the racket 100 according to Embodiment 3, the sealing portion 22 seals both ends of the rail portion 21 which is arranged around the entire periphery of the main body portion 2. Therefore, it is possible to prevent the weight parts 3 from coming off from both ends of the rail portion 21.

[0047] (Embodiment 4) Unless otherwise specified, the racket 100 according to Embodiment 4 has the same structure and effects as the racket 100 according to Embodiment 1.

[0048] Referring to Figures 12 and 13, the configuration of the racket 100 according to Embodiment 4 will be described. In the racket 100 according to Embodiment 4, the rail portion 21 is arranged on each of the pair of tip-side inclined portions and the pair of root-side inclined portions of the main body portion 2. In this embodiment, the racket 100 is equipped with four weight parts 3. The weight parts 3 are configured to be movable along the rail portion 21 on each of the pair of tip-side inclined portions and the pair of root-side inclined portions of the main body portion 2.

[0049] Next, the effects and advantages of the racket 100 according to Embodiment 4 will be described. In the racket 100 according to Embodiment 4, the weight part 3 is configured to be movable along the rail part 21 at each of the pair of tip-side inclined parts and the pair of root-side inclined parts of the main body 2. Therefore, the weight part 3 can be moved along the rail part 21 at each of the pair of tip-side inclined parts and the pair of root-side inclined parts of the main body 2. Thus, the balance of the racket 100 can be finely adjusted in the width direction and length direction of the main body 2 at the tip side and root side of the main body 2 by the weight part 3. Thus, in addition to the moment of inertia of the racket 100 around its minor axis, the moment of inertia of the racket 100 around its major axis can also be changed. The minor axis of the racket 100 extends in the width direction of the main body 2, is located at the center of gravity in the length direction of the main body 2, and is located in the center in the thickness direction of the main body 2. The major axis of the racket 100 extends in the length direction of the main body 2, is located in the center in the width direction of the main body 2, and is located in the center in the thickness direction of the main body 2.

[0050] (Embodiment 5) Unless otherwise specified, the racket 100 according to Embodiment 5 has the same structure and effects as the racket 100 according to Embodiment 1.

[0051] Referring to Figures 14 and 15, the configuration of the racket 100 according to Embodiment 5 will be described. In the racket 100 according to Embodiment 5, the rail portion 21 is arranged on each of the pair of root-side inclined portions of the main body portion 2. In this embodiment, the racket 100 is equipped with two weight parts 3. The weight parts 3 are configured to be movable along the rail portion 21 on each of the pair of root-side inclined portions of the main body portion 2.

[0052] Next, the effects and advantages of the racket 100 according to Embodiment 5 will be described. According to the racket 100 of Embodiment 5, the weight part 3 is configured to be movable along the rail part 21 at each of the pair of root-side inclined portions of the main body 2. Therefore, the weight part 3 can be moved along the rail part 21 at each of the pair of root-side inclined portions of the main body 2. Consequently, the balance of the racket 100 can be finely adjusted in the width direction and length direction of the main body 2 at the root side of the main body 2 by the weight part 3. Thus, in addition to the moment of inertia of the racket 100 around its minor axis, the moment of inertia of the racket 100 around its major axis can also be changed.

[0053] (Embodiment 6) Unless otherwise specified, the racket 100 according to Embodiment 6 has the same structure and effects as the racket 100 according to Embodiment 1.

[0054] Referring to Figure 16, the configuration of the racket 100 according to Embodiment 6 will be described. In the racket 100 according to Embodiment 6, the rail portion 21 is inclined in the thickness direction of the main body portion 2. The thickness direction of the main body portion 2 is the direction in which the front and back surfaces of the main body portion 2 face each other. The weight part 3 is configured to be movable along the rail portion 21 towards the front and base sides of the main body portion 2, and is configured to be movable linearly in the thickness direction of the main body portion 2.

[0055] Next, the effects and advantages of the racket 100 according to Embodiment 6 will be described. According to the racket 100 of Embodiment 6, the weight part 3 is configured to be movable to the front and rear ends of the main body 2, and to be movable linearly in the thickness direction of the main body 2. Therefore, the weight part 3 can be moved to the front and rear ends of the main body 2, and can be moved linearly in the thickness direction of the main body 2. Thus, the balance of the racket 100 can be finely adjusted in the length and thickness directions of the main body 2 by the weight part 3. Thus, in addition to the moment of inertia of the racket 100 around its minor axis, the moment of inertia of the racket 100 around its major axis can also be changed. Furthermore, the performance when hitting the ball with either side of the main body 2 can be changed.

[0056] (Embodiment 7) Unless otherwise specified, the racket 100 according to Embodiment 7 has the same structure and effects as the racket 100 according to Embodiment 1.

[0057] Referring to Figure 17, the configuration of the racket 100 according to Embodiment 7 will be described. In the racket 100 according to Embodiment 7, the rail portion 21 is curved in the thickness direction of the main body portion 2. In this embodiment, the rail portion 21 is curved so as to protrude toward the surface side. The weight part 3 is configured to be movable along the rail portion 21 toward the tip side and the base side of the main body portion 2, and is configured to be movable curvilinearly in the thickness direction of the main body portion 2.

[0058] Next, the effects and advantages of the racket 100 according to Embodiment 7 will be described. According to the racket 100 of Embodiment 7, the weight part 3 is configured to be movable to the front and rear ends of the main body 2, and is configured to be movable curvilinearly in the thickness direction of the main body 2. Therefore, the weight part 3 can be moved to the front and rear ends of the main body 2, and can be moved curvilinearly in the thickness direction of the main body 2. Thus, the balance of the racket can be finely adjusted in the length direction and thickness direction of the main body 2 by the weight part 3. Thus, in addition to the moment of inertia of the racket 100 around its minor axis, the moment of inertia of the racket 100 around its major axis can also be changed. Furthermore, the performance when hitting the ball with the front and back sides of the main body 2 can be changed.

[0059] (Embodiment 8) Unless otherwise specified, the racket 100 according to Embodiment 8 has the same structure and effects as the racket 100 according to Embodiment 1.

[0060] Referring to Figure 18, the configuration of the racket 100 according to Embodiment 8 will be described. In the racket 100 according to Embodiment 8, the flange portion 21a of the rail portion 21 of the main body portion 2 is positioned at the tip of a pair of side walls 21c1. The weight part 3 includes an upper portion 31 and a screw portion 32. The tip of the shaft portion 32b of the screw portion 32 is in contact with the bottom portion 21c2 of the wall portion 21c of the rail portion 21.

[0061] When the screw portion 32 is tightened, the weight part 3 moves toward the pair of flange portions 21a and is pressed against them. This fixes the upper portion 31 to the pair of flange portions 21a. On the other hand, when the screw portion 32 is loosened, the weight part 3 moves toward the bottom portion 21c2 and moves away from the pair of flange portions 21a. This makes the upper portion 31 movable relative to the pair of flange portions 21a. The weight part 3 is then moved along the rail portion 21 to any desired position, and when the screw portion 32 is tightened again, the weight part 3 is fixed in that position. In this way, the weight part 3 can be adjusted to any desired position relative to the rail portion 21.

[0062] Next, the effects and advantages of the racket 100 according to Embodiment 8 will be described. According to the racket 100 of Embodiment 8, the flange portion 21a of the rail portion 21 is not sandwiched by the weight part 3, making the flange portion 21a less likely to break. Therefore, the durability of the rail portion 21 can be improved.

[0063] Although the present invention has been described and illustrated in detail, it is clear that this is for illustrative purposes only and should not be construed as limiting, and the scope of the present invention shall be interpreted by the terms of the claims.

Claims

1. The handle section, The main body connected to the handle portion, The main body portion comprises a weight part that is movable along the peripheral edge of the main body portion, The weight part is configured to be continuously movable along the peripheral edge of the main body, The main body includes a rail portion provided on the peripheral edge, The weight part is configured to be movable along the rail section and to be fixed to the main body while it is moved along the rail section. The rail portion includes a pair of flange portions and a wall portion. The wall portion includes a pair of side walls, a bottom portion, and an opening. Each of the pair of flange portions is positioned between the bottom and the opening, protrudes from each of the pair of side walls in a direction opposite to each other, is spaced apart from each other, and is positioned at the ends of the pair of side walls. The aforementioned weight part includes an upper part and a screw part. The corners of the upper portion facing each of the pair of flange portions and each of the pair of side walls are configured to be right angles. The screw portion includes a head and a shaft portion. The tip of the shaft portion is capable of contacting the bottom portion. As the screw portion is tightened, the upper portion is fixed to the pair of flange portions. A racket in which the upper part becomes movable relative to the pair of flange parts when the screw part is loosened.

2. The racket according to claim 1, wherein the material of the rail portion is one of thermoplastic polyurethane (TPU), polycarbonate (PC), polypropylene (PP), acrylonitrile butadiene styrene copolymer synthetic resin (ABS), or fiber-reinforced plastic (FRP).

3. The racket according to claim 1, wherein the minimum width of the head is greater than the diameter of the shaft portion.

4. The aforementioned shaft portion is provided with a groove, The racket according to claim 1, wherein the groove is located on the opposite side of the head from the screw threads provided on the shaft.

5. The racket according to claim 1, wherein the upper portion is arranged at a distance from the bottom portion.

6. The bottom surface of the rail portion is formed flat, as described in claim 1.

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