TWI845297B - Table tennis racket with ribbed core material and manufacturing method thereof - Google Patents

Abstract

The present invention discloses a tennis racket with a ribbed core material, which includes a ball striking part and a grip part. The ball striking part includes a racket frame, a first surface layer, a second surface layer and an inner layer structure. The racket frame has an inner wall and a containing space. The inner layer structure is arranged in the containing space and includes an upper core material, a lower core material and a ribbed core material stacked between the upper core material and the lower core material. The first surface layer is laid on the top surface of the upper core material, and the second surface layer is laid on the bottom surface of the lower core material. The racket frame, the first surface layer, the second surface layer and the ribbed core material are all made of carbon fiber composite materials, and the first surface layer, the second surface layer and the ribbed core material are all integrally connected to the racket frame. By means of the structural design of the paddle tennis racket, the overall rigidity of the paddle tennis racket is improved.

Description

Table tennis racket with ribbed core material and manufacturing method thereof

The present invention relates to a paddle tennis racket, and more particularly to a paddle tennis racket having a rib core material, the overall structure of which has good rigidity.

Paddle tennis is a sport similar to tennis in which a ball is hit with a racket. Paddle tennis can be played as a single or doubles. The amount of activity and exercise involved is less than that of tennis, so it is suitable for people of all ages. In recent years, it has gradually become popular and is loved by the general public.

The core material inside the traditional paddle tennis racket is uniform and made of a single material. Due to the material and structure of the core material, the rigidity of the traditional paddle tennis racket is poor. Therefore, when the player hits the ball, the force of the ball rebounding through the racket will be weaker, which may weaken the player's attack and return performance during the game.

One of the objects of the present invention is to provide a novel structure design of a tennis racket, the overall structure of which has better rigidity.

In order to achieve the above purpose, this application provides the following technical solutions:

A tennis racket with a ribbed core material comprises a ball striking part and a grip part connected to the ball striking part. The ball striking part comprises a racket frame, a first surface layer, a second surface layer and an inner layer structure. The racket frame has an inner wall and a containing space formed by the inner wall. The inner layer structure is arranged in the containing space and comprises an upper core material, a lower core material and a ribbed core material stacked between the upper core material and the lower core material. The first surface layer is laid on the top surface of the upper core material, and the second surface layer is laid on the bottom surface of the lower core material. The racket frame, the first surface layer, the second surface layer and the rib core material are all made of carbon fiber composite materials, and the first surface layer, the second surface layer and the rib core material are integrally connected to the racket frame.

With the structural design of the paddle tennis racket, the high-strength first surface layer, the second surface layer and the rib core material made of carbon fiber composite are connected to the inner wall of the racket frame in a parallel manner. The first surface layer, the second surface layer and the rib core material are structurally connected in parallel. In the cross section, the integrally connected rib core material and the racket frame form a structure similar to the English letter "I", so that the overall rigidity of the paddle tennis racket becomes better, so that the force transmitted to the inside of the paddle tennis racket by the ball when hitting the ball can be better withstood and rebounded to the ball, so that the ball will have a stronger force when rebounding, which can help the player's attack and return performance during the game.

In one aspect, the thickness of the upper core material and the lower core material are the same.

In another aspect, the upper core material and the lower core material are made of the same material. In some cases, the upper core material and the lower core material may also be made of different materials.

The present application also provides a method for manufacturing a paddle tennis racket, which comprises the following steps: providing a plurality of rollable sheets coated with resin and an expandable material, wherein the rollable sheets are made of carbon cloth; winding the rollable sheets coated with resin on the outside of the expandable material to form a tubular structure, wherein the tubular structure has a first end and a second end disposed opposite to each other; bending the tubular structure to form a frame and a columnar body connected to each other, wherein the inner wall of the frame is surrounded to form a containing space, wherein the columnar body is provided with a first end and a second end; The frame is formed by a first end and a second end which are linearly supported; a lower composite sheet, a lower core material, a first middle composite sheet, a second middle composite sheet, an upper core material and an upper composite sheet are sequentially laid in the above-mentioned accommodation space from bottom to top, the outer edge of the first middle composite sheet is bent downward so that the outer edge of the first middle composite sheet is attached between the inner wall of the frame and the lower core material, the outer edge of the second middle composite sheet is bent upward so that the outer edge of the second middle composite sheet is attached between the inner wall of the frame and the upper core material, wherein the lower composite sheet The first middle composite sheet, the second middle composite sheet and the upper composite sheet are all made of carbon cloth, the bent tubular structure and the laid lower composite sheet, the lower core material, the first middle composite sheet, the second middle composite sheet, the upper core material and the upper composite sheet are collectively defined as a preform; the preform is pressurized and heated to expand the expandable material, so that the heat-cured columnar body is formed into a grip of the paddle tennis racket, the heat-cured frame is formed into a racket frame of the paddle tennis racket, and the heat-cured upper composite sheet integrally connected to the racket frame is formed into The first surface layer of the paddle tennis racket is formed into a second surface layer by the lower composite sheet which is integrally connected to the racket frame after heat curing, and the first middle composite sheet and the second middle composite sheet which are integrally connected to each other and the racket frame after heat curing are jointly formed into the rib core material of the paddle tennis racket, that is, the upper core material, the lower core material and the rib core material after forming are jointly defined as the inner layer structure, and the racket frame, the first surface layer, the second surface layer and the inner layer structure after forming are jointly defined as the hitting part, and the hitting part and the gripping part are jointly defined as the above-mentioned paddle tennis racket.

The following is a detailed description of the technical content and features of the present invention through several embodiments listed in conjunction with drawings. Directional descriptive terms such as "upper", "lower", "inner", "outer", "top", and "bottom" mentioned in this specification are only illustrative descriptive terms based on normal use directions and are not intended to limit the scope of the claims.

In order to explain the technical features of the present invention in detail, the following embodiments are provided with accompanying drawings, wherein:

As shown in FIGS. 1 to 4 , the present embodiment provides a paddle tennis racket 1, which includes a ball striking part 10 and a grip part 20 connected to the ball striking part 10. The ball striking part 10 is a part of the paddle tennis racket 1 used for striking the ball. Generally, the thickness of the ball striking part 10 is between 22 mm and 38 mm (mm) to meet the specifications of the paddle tennis racket 1. The ball striking part 10 includes a frame 11, a first surface layer 12, an inner layer structure 13 and a second surface layer 14 in structure. The frame 11 is formed by curing by applying pressure and heating to a carbon fiber composite material. In the present embodiment, the interior of the frame 11 is hollow, and the frame 11 has an inner wall 111, and the inner wall 111 surrounds a roughly diamond-shaped accommodation space. The inner structure 13 is disposed in the above-mentioned accommodation space. The first surface layer 12 and the second surface layer 14 are used for direct contact with the ball. The first surface layer 12 and the second surface layer 14 are also made of carbon fiber composite materials. The first surface layer 12 is integrally connected to the upper edge of the racket frame 11, and the second surface layer 14 is integrally connected to the lower edge of the racket frame 11.

The inner structure 13 is disposed between the first surface layer 12 and the second surface layer 14. The inner structure 13 includes an upper core material 131, a lower core material 133, and a rib core material 132 stacked between the upper core material 131 and the lower core material 133. The first surface layer 12 is laid on the top of the upper core material 131. The upper core material 131 is a foamed layer structure and is made of EVA material (ethylene/vinyl acetate copolymer, Ethylene-Vinyl Acetate) foamed. The Shore hardness of the EVA material is Shore A 10-25 degrees. The EVA material has good rigidity and is helpful for hitting feeling. The rib core material 132 is used to provide a supporting effect. The rib core material 132 is formed by stacking and curing multiple pieces of carbon cloth. The outer edge of the rib core material 132 is integrally connected to the racket frame 11. The second surface layer 14 is laid on the bottom surface of the lower core material 133. The lower core material 133 is also a foamed layer structure and is also made of EVA material. The thickness of the lower core material 133 is the same as the thickness of the upper core material 131. Since the frame 11, the first surface layer 12, the second surface layer 14 and the fin core material 132 are all made of carbon fiber composite materials, during the process of heating and pressurizing the carbon fiber composite materials using a mold and an expandable material (which will be described in detail in the following paragraphs), the carbon fiber composite materials will soften and produce a bridging reaction, thereby forming the appearance of the above-mentioned parts.

In addition, as shown in FIG. 1 and FIG. 4 , the ball striking portion 10 is further provided with a plurality of through holes 15 , each of which penetrates the first surface layer 12 , the inner structure 13 and the second surface layer 14 , so that airflow can smoothly pass through the ball striking portion 10 , thereby reducing wind resistance.

The grip portion 20 is used for the user to hold, and the grip portion 20 is integrally connected to the frame 11. In addition, the grip portion 20 is also covered with a grip belt 21 to prevent slipping and shock.

According to the structural design of the tennis racket 1, the first surface layer 12, the second surface layer 14 and the rib core material 132 made of carbon fiber composite material are connected to the inner wall 111 of the racket frame 11 in a parallel manner. The first surface layer 12, the second surface layer 14 and the rib core material 132 are structurally connected in parallel. In the cross section, The integrally connected rib core material 132 and the racket frame 11 form a structure similar to the English letter "I", which makes the overall rigidity of the paddle tennis racket 1 better, so that it can better withstand the force transmitted to the inside of the paddle tennis racket 1 by the ball when hitting the ball and rebound it to the ball, so that the ball will have a stronger force when rebounding, which can help the player's attack and return performance during the game.

This embodiment further provides a manufacturing method for manufacturing a tennis racket 1′. Please refer to FIG. 5 to FIG. 6J. The manufacturing method includes the following steps:

Step S1: Starting step: providing a plurality of rollable sheets S coated with resin and an expandable material F (as shown in FIG. 6A ), wherein the rollable sheets S are actually a plurality of layers of carbon cloth, and the expandable material F is an air bag in this embodiment, which can be inflated and expanded. Depending on different manufacturing processes, the air bag may also be filled with a foaming material.

Step S2: Winding the rollable sheets S coated with resin on the outside of the expandable material F to form a tubular structure T (as shown in FIG. 6B ), wherein the tubular structure T has a first end E1 and a second end E2 disposed opposite to each other. At this time, the expandable material F has not yet been inflated and expanded.

Step S3: Place the tubular structure T in a cavity C of a mold M, bend the tubular structure T to form a frame 30 and a columnar body 40 connected to each other (as shown in FIG. 6C ), wherein the inner wall of the frame 30 surrounds to form a receiving space R, and the columnar body 40 is formed by a first end E1 and a second end E2 which are linearly adjacent to each other.

To facilitate the description of the following steps, FIGS. 6D to 6H are drawn from the perspective of the L-L section line in FIG. 6C .

Step S4: In the mold cavity C and in the accommodating space R, a layer of lower composite sheet 16 is laid on the inner wall of the mold cavity C (as shown in FIG. 6D ), a lower core material 133 is laid on the lower composite sheet 16 (as shown in FIG. 6E ), a first middle composite sheet 17 and a second middle composite sheet 18 are laid on the lower core material 133, and the outer edge of the first middle composite sheet 17 is bent downward so that the outer edge of the first middle composite sheet 17 is attached between the inner wall of the frame 30 and the lower core material 133, and the outer edge of the second middle composite sheet 18 is bent upward (as shown in FIG. 6F ). Afterwards, an upper core material 131 is laid on the second middle composite sheet 18, and the outer edge of the second middle composite sheet 18 is attached between the inner wall of the frame 30 and the upper core material 131 (as shown in FIG. 6G), and finally an upper composite sheet 19 is laid on the upper core material 131 (as shown in FIG. 6H), and in some cases, a reinforcing rib 50 may be placed (see FIG. 6J). Among them, the lower composite sheet 16, the first middle composite sheet 17, the second middle composite sheet 18 and the upper composite sheet 19 are all made of carbon cloth, and the upper core material 131 and the lower core material 133 can be made of EVA foaming material, and the thickness of the upper core material 131 and the lower core material 133 are the same. The bent tubular structure T and the laid lower composite sheet 16, the lower core material 133, the first middle composite sheet 17, the second middle composite sheet 18, the upper core material 131 and the upper composite sheet 19 are collectively defined as a preform.

Step S5: The preform is pressurized and heated by the mold M, and the expandable material F is inflated to expand the expandable material F, so that the columnar body 40 is formed into the grip 20 after heat curing, the frame body 30 is formed into the frame 11 after heat curing, the upper composite sheet 19 which is integrally connected to the frame 11 after heat curing is formed into the first surface layer 12, the lower composite sheet 16 which is integrally connected to the frame 11 after heat curing is formed into the second surface layer 14, and the composite sheet 16 which is integrally connected to each other after heat curing is formed into the second surface layer 14. The first middle composite sheet 17 and the second middle composite sheet 18 connected to the racket frame 11 are jointly formed into a rib core material 132 (as shown in FIG6I ), that is, the upper core material 131, the lower core material 133 and the rib core material 132 after being formed jointly define an inner structure 13, and the racket frame 11, the first surface layer 12, the second surface layer 14 and the inner structure 13 after being formed jointly define a hitting part 10, and the hitting part 10 and the grip part 20 jointly define a tennis racket 1′ (as shown in FIG6J ).

Step S6: Ending step: Drill a plurality of through holes 15 on the hitting part 10 of the tennis racket 1′, and wrap the grip tape 21 around the grip part 20.

Finally, it must be reiterated that the methods and components disclosed in the aforementioned embodiments of the present invention are merely illustrative and are not intended to limit the patent scope of the present invention. Any simple structural modifications or changes that do not depart from the spirit of the present invention, or replacement with other equivalent components, should still fall within the scope of the patent application of the present invention.

1: Paddle tennis racket 1’: Paddle tennis racket 10: Hitting part 11: Racquet frame 111: Inner wall 12: First surface layer 13: Inner structure 131: Upper core material 132: Rib core material 133: Lower core material 14: Second surface layer 15: Through hole 16: Lower composite sheet 17: First middle composite sheet 18: Second middle composite sheet 19: Upper composite sheet 20: Grip part 21: Grip band 30: Frame 40: Column 50: Reinforcement rib C: Mold cavity E1: First end E2: Second end F: Expandable material M: Mold R: Accommodation space S: Rollable sheet T: Tubular structure

The detailed structure, features, and manufacturing steps of the paddle tennis racket will be described in the following embodiments. However, it should be understood that the embodiments and drawings described below are only for exemplary purposes and should not be used to limit the scope of the patent application of the present invention.

FIG. 1 is a three-dimensional diagram of a paddle tennis racket of an embodiment; FIG. 2 is a top view of FIG. 1; FIG. 3 is a cross-sectional view drawn along the 3-3 section line of FIG. 2; FIG. 4 is a cross-sectional view drawn along the 4-4 section line of FIG. 2; FIG. 5 is a flow chart of a method for making a paddle tennis racket of an embodiment; and FIG. 6A to FIG. 6J are schematic diagrams corresponding to each step in the manufacturing process flow chart.

11: Shooting frame

111: Inner wall

12: First surface layer

13: Inner structure

131: Upper core material

132: fin core material

133: Lower core material

14: Second surface layer

Claims (3)

A method for manufacturing a tennis racket comprises the following steps: providing a plurality of rollable sheets coated with resin and an expandable material, wherein the rollable sheets are made of carbon cloth; winding the rollable sheets coated with resin on the outside of the expandable material to form a tubular structure, wherein the tubular structure has a first end and a second end disposed opposite to each other; bending the tubular structure to form a frame and a columnar body connected to each other, wherein the inner wall of the frame surrounds to form an accommodation space, wherein the columnar body is formed by the first end and the second end being linearly supported against each other. The second end is formed; a lower composite sheet, a lower core material, a first middle composite sheet, a second middle composite sheet, an upper core material and an upper composite sheet are sequentially laid in the accommodating space from bottom to top, the outer edge of the first middle composite sheet is bent downward so that the outer edge of the first middle composite sheet is attached to the inner wall of the frame and the lower core material, and the outer edge of the second middle composite sheet is bent upward so that the outer edge of the second middle composite sheet is attached to the inner wall of the frame and the upper core material, wherein the lower composite sheet, the first middle composite sheet The first composite sheet, the second composite sheet and the upper composite sheet are all made of carbon cloth; the bent tubular structure and the laid lower composite sheet, the lower core material, the first composite sheet, the second composite sheet, the upper core material and the upper composite sheet are collectively defined as a preform; the preform is pressurized and heated to expand the expandable material, so that the columnar body after heat curing is formed into the gripping portion, the frame body after heat curing is formed into a racket frame, the upper composite sheet after heat curing and integrally connected to the racket frame is formed into a first surface layer, and the heat curing The lower composite sheet which is integrally connected to the racket frame after heat curing is formed into a second surface layer, and the first middle composite sheet and the second middle composite sheet which are integrally connected to each other and the racket frame after heat curing are jointly formed into a rib core material, that is, the upper core material, the lower core material and the rib core material after forming are jointly defined as an inner layer structure, and the racket frame, the first surface layer, the second surface layer and the inner layer structure after forming are jointly defined as a ball striking part, and the ball striking part and the gripping part are jointly defined as the board tennis racket. A method for manufacturing a tennis racket as described in claim 1, wherein the thickness of the upper core material and the lower core material are the same. A method for manufacturing a tennis racket as described in claim 1 or 2, wherein the upper core material and the lower core material are made of the same material.

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