Table tennis bat with two bottom plates

Abstract

A table tennis bat with two bottom plates comprises the bottom plates and a bat handle, and is characterized in that the bottom plates comprise a bottom plate A and a bottom plate B, and the bat handle is provided with an end A and an end B; the bottom plate A is directly or indirectly connected with the racket handle or the racket handle main body into a whole, and the bottom plate B is directly or indirectly connected with the racket handle or the racket handle main body into a whole; the distance from the gravity center of the bottom plate A to the end face of the end A of the racket handle is smaller than the distance from the gravity center of the bottom plate A to the end face of the end B of the racket handle, and the distance from the gravity center of the bottom plate B to the end face of the end B of the racket handle is smaller than the distance from the gravity center of the bottom plate B to the end face of the end A of the racket handle. A hand holding the racket handle of an athlete is close to the bottom plate A; when the distance between the table tennis hit by the opposite side and the sportsman is close, the sportsman uses the bottom plate A and adopts a pen-hold racket holding method to hit the table tennis; when the distance between the table tennis hit by the opposite side and the sportsman is far, the sportsman hit the table tennis by using the bottom plate B and adopting a transverse bat holding method; and an athlete can quickly switch between the two gripping methods.

Description

Technical Field

[0001] The invention relates to a table tennis racket, in particular to a table tennis racket with two bottom plates. Background Art

[0002] The most popular table tennis rackets at present are the table tennis rackets with a penhold grip and the table tennis rackets with a horizontal grip; their components each include two handle bars and a bottom plate; the bottom plate includes a hitting part and a handle base; the handle includes the handle base of the bottom plate and two handle bars; an anti-skid surface can be provided on any of the handle bars; the ideal state of the anti-skid surface is a plane, which intersects with the inner end surface of the handle bar and forms an angle of 20°-75° with the center line of the handle, and can be called a flat and oblique anti-skid surface. However, a flat and oblique anti-skid surface is not necessary, because the inner end surface of each handle bar can be used as an anti-skid surface; there are also many table tennis rackets whose handles are not provided with a flat and oblique anti-skid surface; some patent applications for table tennis rackets specifically emphasize the use of the inner end surface of the handle without a flat and oblique anti-skid surface as an anti-skid surface. Athlete A uses a table tennis racket with a pen-grip grip to participate in the competition. When the table tennis ball hit by the opponent falls on the middle right side of the player A's table, the player A can easily deal with it; when the table tennis ball hit by the opponent is on the left edge of the table, the player A is relatively passive. Athlete A uses a table tennis racket with a horizontal grip to participate in the competition. When the table tennis ball hit by the opponent falls on the middle right side of the player A's table, the player A is relatively passive; when the table tennis ball hit by the opponent falls on the left edge of the table, the player A can easily deal with it. Therefore, the pen-grip grip and the horizontal grip each have advantages and disadvantages, but the player cannot change the grip of the table tennis racket in a very short time during the competition. And these two grips also have common disadvantages: the distance of extending the table tennis racket is not far enough when the player's position and posture remain unchanged; when the landing point of the table tennis ball hit by the opponent always rotates between the left corner and the right corner of the player A's table, the player A is very passive.

[0003] Note 1: The part of the bottom plate that contacts any handle bar is the handle base of the bottom plate, and the part of the bottom plate other than the handle base is the ball striking part of the bottom plate; the handle base and ball striking part of the bottom plate A and bottom plate B described in this application are similar. Each handle bar has two end faces, the end face close to the center of gravity of the bottom plate is the inner end face of the handle bar, and the other end face is the outer end face. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing table tennis racket that the table tennis racket cannot be quickly switched between the upright grip and the horizontal grip and cannot be extended far enough without changing the position and posture of the player, and to provide a table tennis racket with two bottom plates. The technical solution adopted by the present invention is:

[0005] 1. A table tennis racket with two bottom plates, comprising a bottom plate and a handle, characterized in that: the bottom plate comprises a bottom plate A and a bottom plate B, the handle has an A end and a B end; the bottom plate A is directly or indirectly connected to the handle or the handle body as a whole, and the bottom plate B is directly or indirectly connected to the handle or the handle body as a whole; the distance from the center of gravity of the bottom plate A to the end surface of the A end of the handle is smaller than the distance from the center of gravity of the bottom plate A to the end surface of the B end of the handle, and the distance from the center of gravity of the bottom plate B to the end surface of the B end of the handle is smaller than the distance from the center of gravity of the bottom plate B to the end surface of the A end of the handle.

[0006] Note 2: The table tennis racket described in this application has two bottom plates. Regardless of the relative position relationship between the racket handle and the two bottom plates, the two ends of the racket handle are named end A and end B respectively. There are three interpretations of "end face" on the Internet: one is "the surface at both ends of an object", the second is "referring to the plane at both ends of a cylindrical workpiece", and the third is "the plane at both ends of a cylindrical workpiece". With reference to the above three explanations, the explanations for the "A end", "end surface of the A end of the handle", "B end" and "end surface of the B end of the handle" of the handle are as follows: establish a spatial rectangular coordinate system (the X-axis is horizontal and the arrow points to the right, the Y-axis is horizontal and the arrow points forward, the Z-axis is vertical and the arrow points upward, and the spatial rectangular coordinates described in this application all have these characteristics), place the handle in the spatial rectangular coordinate system, the center line of the handle coincides with the X-axis, and the size of the handle in the X-axis direction is the largest, then the left end of the handle is its "A end", the right end of the handle is its "B end", the surface of the left end of the handle that intersects with the X-axis is the "end surface of the A end of the handle", and the surface of the right end of the handle that intersects with the X-axis is the "end surface of the B end of the handle". When the handle is solid, the surface between the end surface at the A end and the end surface at the B end of the handle is the side surface of the handle; when the handle is hollow, the outer surface between the end surface at the A end and the end surface at the B end of the handle is the outer side surface of the handle, and the inner surface between the end surface at the A end and the end surface at the B end of the handle is the inner side surface of the handle.

[0007] For example, Figures 10 to 12 In the second structure of a table tennis racket with two bottom plates, the end surface of the first integral handle at the A end and the end surface of the B end are planes that are not perpendicular to the center line of the first integral handle, and the end surface of the A end is the surface connected to the second bottom plate A, and the end surface of the B end is the surface connected to the second bottom plate B. For another example, Figure 29 to Figure 31 When the fourth integral handle body is used for a table tennis racket, the B end of the handle of the table tennis racket is Fig.31 The right end of the handle of the racket, the end face of the B end is Fig.31The end face of the right end of the handle body in the racket, the end face of the right end is perpendicular to the paper surface in an ideal state. When the racket handle includes handle bar A, handle bar B, the handle base of bottom plate A and the handle base of bottom plate B, the end face of the A end of the racket handle includes the end face of the A end of handle bar A and the end face of the A end of handle bar B, and also includes an invisible face on bottom plate A between the end faces of the A ends of the two handle bars, which is a part of the interface between the ball hitting part and the handle base; the end face of the B end of the racket handle includes the end face of the B end of handle bar A and the end face of the B end of handle bar B, and also includes an invisible face on bottom plate B between the end faces of the B ends of the two handle bars, which is a part of the interface between the ball hitting part and the handle base of bottom plate B; if the ball hitting parts of bottom plate A and bottom plate B of the table tennis racket are completely cut off and only the racket handle is retained, the two invisible faces are displayed.

[0008] set up Figures 1 to 3 and Figures 7 to 9The first handle bar B in the ideal state shown is located in a spatial rectangular coordinate system (the center line of the first handle bar B coincides with the X-axis, and the largest plane of the first handle bar B is perpendicular to the Z-axis); the size of the first handle bar B in the X-axis direction is the largest, and its size in the Z-axis direction is the smallest; the left end of the first handle bar B is its A end, and the plane of its left end is the end face of its A end, and the right end is its B end, and the plane of its right end is the end face of its B end, and the end face of its A end and the end face of its B end are each part of an ellipse, the two end faces are parallel to each other, the two end faces are perpendicular to the X-axis, and the projections of the two end faces on the projection plane parallel to the end face of the A end coincide. The surface between the end surface of the A end and the end surface of the B end of the first handle bar B is its side surface. There are two side surfaces (in the definition of a cylinder, the surface between the two bottom surfaces of a cylinder is called a side surface; referring to this definition, this application refers to the surface between the two end surfaces of an elliptical cylinder as a side surface): one is a large side surface, which is a part of the side surface of the elliptical cylinder; the other is a small side surface, which is a plane, and is used to connect with the handle base of the bottom plate A and the handle base of the bottom plate B. The small side surface is the connection surface of the first handle bar A. The large side surface of the first handle bar B can also be designed as a part of the side surface of a cylinder, or designed as other curved surfaces, or designed as a combination of curved surfaces and planes, or designed as a combination of planes and planes. The first handle bar B actually produced has a certain gap with its ideal state, but the definition of each surface of the first handle bar B actually produced is still determined according to the definition of its ideal state. The first handle bar A has the same characteristics as the first handle bar B, but the directions are opposite. The present application also provides a variety of handle bars B and handle bars A, and the methods for determining the end face of the A end, the end face of the B end, the large side face and the small side face thereof are similar. When the handle base of a certain bottom plate A of a certain table tennis racket is installed in the connection groove A of the A end region of a certain handle body, the handle of the table tennis racket includes the handle body and the handle base of the bottom plate A, and the "end face of the A end of the handle" includes the two end faces of the A end of the handle body and the invisible surface on the bottom plate A located between the two end faces of the A end of the handle body, which is a part of the interface between the ball hitting part of the bottom plate A and the handle base. When the handle base of a certain bottom plate B of a certain table tennis racket is installed in the connection groove B of the B end region of a certain handle body, the handle of the table tennis racket includes the handle body and the handle base of the bottom plate B, and the "end surface of the B end of the handle" includes the two end surfaces of the B end of the handle body and the invisible surface on the bottom plate B located between the two end surfaces of the B end of the handle body, which is a part of the interface between the ball hitting part of the bottom plate B and the handle base. For example, Fig.54In the tenth structure of the table tennis racket with two bottom plates, the two end surfaces of the left end of the first connecting device perpendicular to the center line of the handle are the end surfaces of the A end of the sixth combined hollow handle body, and the invisible surface between the two end surfaces on the fifth bottom plate A is a part of the interface between the ball hitting part and the handle base of the bottom plate A. The A end of the handle of this table tennis racket is the left end of the first connecting device, and the end surface of the A end of the handle includes the two end surfaces of the left end of the first connecting device perpendicular to the center line of the handle and the invisible surface between the two end surfaces on the fifth bottom plate A. The invisible surface between the two end surfaces; the two end surfaces of the right end of the second connecting device perpendicular to the center line of the handle are the end surfaces of the B end of the sixth combined hollow handle body, and the invisible surface on the sixth bottom plate B located between the two end surfaces is a part of the interface between the hitting part of the bottom plate B and the base of the handle. The B end of the handle of this table tennis racket is the right end of the second connecting device, and the end surface of the B end of the handle includes the two end surfaces of the right end of the second connecting device perpendicular to the center line of the handle and the invisible surface on the sixth bottom plate B located between the two end surfaces.

[0009] Explanation of the center line of the handle: take the first cross section, which can cut the handle into a larger section A and a smaller section B; take the second cross section, which can cut section A of the handle into two sections; the center or centroid of the first cross section is point K, and the center or centroid of the second cross section is point H. The length of line segment KH is greater than or equal to "85% of the length of the handle", then the straight line passing through points K and H is taken as the center line of the handle.

[0010] Note 3: Since the flat and oblique anti-slip surface is not necessary, and the technical solution 1 does not explain that "the handle is provided with a flat and oblique anti-slip surface" or "the handle has a flat and oblique anti-slip surface", the handle in the technical solution 1 is not provided with a flat and oblique anti-slip surface (or the handle does not have a flat and oblique anti-slip surface). Therefore, the handle in the claim corresponding to the technical solution 1 is not provided with a flat and oblique anti-slip surface (or the handle does not have a flat and oblique anti-slip surface). Note 4: The handle body refers to the main component of the handle. "The bottom plate A is directly or indirectly connected to the handle or the handle body as a whole" means: the bottom plate A is directly connected to the handle as a whole, or the bottom plate A is directly connected to the handle body as a whole, or the bottom plate A is indirectly connected to the handle as a whole, or the bottom plate A is indirectly connected to the handle body as a whole. The connection between the bottom plate A and the handle or the handle body is a direct connection; the connection between the bottom plate A and the connecting member, and the connecting member and the handle or the handle body is an indirect connection. The meaning of "the bottom plate B is directly or indirectly connected to the handle or the handle body to form an integral whole" is similar. The methods of direct and indirect connection include: bonding with glue, connecting with screws, rivets and other connecting parts, and tight-fit connection; but the best method is to use glue, or a combination of glue and tight-fit connection; all technical solutions and embodiments of this application are connected by these methods. "Connected to form an integral whole" means that after the relevant parts are connected to form an integral whole, normal use will not damage the connection of the relevant parts. If Fig.104 The seventh base plate B is installed in the connection groove B of the tenth connection piece, and the left end face of the tenth connection piece is glued to Fig.10 The right end surface of the first integral handle is an example of indirect connection between the bottom plate and the handle. Explanation 5: The A end area of ​​the handle body is an area extending from the A end of the handle body to the B end of the handle body for a distance; the B end area of ​​the handle body is an area extending from the A end of the handle body to the B end of the handle body for a distance; the left end area of ​​an object is an area extending from the left end of the object to the right end of the object for a distance; the right end area of ​​an object is an area extending from the right end of the object to the left end of the object for a distance; the "distance" is determined according to actual conditions; the meaning of the A end area of ​​an object, the meaning of the B end area of ​​an object, the meaning of the A end area of ​​the outer surface of an object, the meaning of the A end area of ​​the inner surface of an object, the meaning of the B end area of ​​the outer surface of an object, the meaning of the B end area of ​​the inner surface of an object, and so on, and the meaning of a certain end area of ​​a certain surface (inner or outer surface) of an object is so on.

[0011] Additional technical features are proposed for technical solution 1:

[0012] 1. The bottom plate A and bottom plate B each have a ball striking portion and a handle base; the handle comprises a handle bar A and a handle bar B; the handle bar A, the handle bar B, the handle base of the bottom plate A and the handle base of the bottom plate B are connected to form a handle, and the handle base of the bottom plate A and the handle base of the bottom plate B are located between the handle bar A and the handle bar B.

[0013] 2. The bottom plate A and bottom plate B each have a ball striking portion and a handle base; the handle comprises a handle bar A and a handle bar B, and the handle bar A and the handle bar B are connected to form a handle body; the handle body has a connecting groove A or a connecting hole A, and the handle body also has a connecting groove B or a connecting hole B, the handle base of the bottom plate A is installed in the connecting groove A or the connecting hole A, and the handle base of the bottom plate B is installed in the connecting groove B or the connecting hole B.

[0014] Note 6: In the "Additional Technical Feature 2", since the handle includes the handle base of the bottom plate A and the handle base of the bottom plate B, the product of the connection of the handle strip A and the handle strip B is only the handle body; the A end of the handle strip A and the A end of the handle strip B together constitute the A end of the handle body, and the B end of the handle strip A and the B end of the handle strip B together constitute the B end of the handle body. Regardless of whether the handle body is an integral shape or a combined shape, the connection groove A extends a distance from the end face of the A end of the handle body to the end face direction of the B end of the handle body, and the length of this distance is L. Then the length of the connection groove A is L, which is determined according to the specific structure and material of the table tennis racket, and L is less than the length of the handle. The connection groove B extends a distance from the end face of the B end of the handle body to the end face direction of the A end of the handle body, and the length of this distance is L. Then the length of the connection groove B is L, which is determined according to the specific structure and material of the table tennis racket, and L is less than the length of the handle. The longer the connection groove is, the longer the handle base of the related bottom plate is, and the more labor, materials and energy are wasted in producing the related bottom plate. There is no need to limit the length of the connection groove A and the connection groove B, as long as the table tennis racket can be used normally after the bottom plate A and the handle body are connected as a whole, and the bottom plate B and the handle body are connected as a whole; the length of the connection groove is generally 15 mm to 120 mm, and the optimal value is 18 mm to 25 mm. Since at least three surfaces of the handle base of the related bottom plate are bonded to the related surfaces of the connection groove as a whole, the bonding strength is guaranteed. Reference Figure 39 to Figure 45There are many ways to set the connection groove A on the handle body, because there are many choices for the position, direction, shape and size of the connection groove A, so as long as the handle base of the bottom plate A can be installed in the set connection groove A and meet the strength requirements; similarly, there are many ways to set the connection groove B on the handle body, as long as the handle base of the bottom plate B can be installed in the set connection groove B and meet the strength requirements; and there is no restriction on the relative position relationship between the bottom plate A and the bottom plate B, for example, it is not required that the plane where any hitting surface of the bottom plate A is located is parallel, coincident or perpendicular to the plane where a hitting surface of the bottom plate B is located; of course, it is an ideal state that the plane where any hitting surface of the bottom plate A is located is parallel, coincident or perpendicular to the plane where a hitting surface of the bottom plate B is located. Examples of methods for setting the connection groove A in the A-end region of the handle body include: first, setting a connection notch in the A-end region of the handle bar A, and the connection notch and the connection surface in the A-end region of the handle bar B together form the connection groove A; second, setting a connection notch in the A-end region of the handle bar B, and the connection notch and the connection surface in the A-end region of the handle bar A together form the connection groove A; third, setting a connection notch in the A-end region of the handle bar A and the A-end region of the handle bar B respectively, and the two connection notches together form the connection groove A, refer to Figure 42 to Figure 45 and related text description; fourth, the A end region of the handle bar A and the A end region of the handle bar B are each provided with a shallow connection groove, and the two shallow connection grooves together constitute a connection groove A, such as Fig.49 The connection groove A in Figure 46 to Figure 48 The connection slot A is set by using the connection slot B in the racket handle. The method for setting the connection slot B is the same as the method for setting the connection slot A. Examples of methods for setting the connection hole are: one is to start from one end of the racket handle body and extend a distance toward the other end of the racket handle body, referring to the above four methods for setting the connection slot to set the connection hole; the second is to start from a certain point on the side of the racket handle body and extend toward another point on the side of the racket handle body; refer to Figure 29 to Figure 31 For related text descriptions, see Figure 50 to Figure 53 The method for setting the connection groove A, the connection hole A, the connection groove B and the connection hole B described below is similar.

[0015] Additional technical features are proposed for additional technical features 1 and additional technical features 2:

[0016] 1.1, 2.1, the handle bar A is provided with a weight-reducing groove, which starts from the middle area of ​​the connecting surface of the handle bar A and extends to the large side of the handle bar A; the handle bar B is provided with a weight-reducing groove, which starts from the middle area of ​​the connecting surface of the handle bar B and extends to the large side of the handle bar B.

[0017] 1.2, 2.2 The handle base of the bottom plate A and the handle base of the bottom plate B are each provided with a weight-reducing notch.

[0018] Note 7: The weight-reducing groove starts from the middle area of ​​the connection surface of the handle bar A and extends to the large side of the handle bar A. The extension size is related to the material of the handle bar A and the overall size of the handle bar A. When the material of the handle bar A is the same, the larger the overall size of the handle bar A, the larger the extension size; when the overall size of the handle bar A is the same, the higher the strength of the material of the handle bar A, the larger the extension size, so the technical solution does not need to limit the extension size but only the extension direction. The "middle area of ​​the connection surface of the handle bar A" is located between the connection groove A and the connection groove B of the handle. Generally, the distance between the weight-reducing groove and the connection groove A is greater than zero, and the distance between the weight-reducing groove and the connection groove B is greater than zero, so as to ensure that the strength of the handle meets the requirements; if the material of the handle bar A and the handle bar B is very good, the distance between the weight-reducing groove and the connection groove A is equal to zero, and the distance between the weight-reducing groove and the connection groove B is equal to zero. After the weight-reducing groove is provided in the middle area of ​​the handle bar A, the shape of the middle area is similar to the tile shape. The same applies to the description of “the handle bar B is provided with a weight-reducing groove, which starts from the middle area of ​​the connecting surface of the handle bar B and extends toward the side of the handle bar B”.

[0019] 3. The handle body includes a handle rod, the handle rod has a connecting groove A or a connecting hole A, and the handle rod also has a connecting groove B or a connecting hole B; the bottom plate A and the bottom plate B each have a hitting part and a handle base, the handle base of the bottom plate A is installed in the connecting groove A or the connecting hole A, and the handle base of the bottom plate B is installed in the connecting groove B or the connecting hole B.

[0020] Note 8: The main section of the handle has many shapes, including regular flat bodies, irregular flat bodies, and cylinders; the ideal shape of the handle is a regular flat cylinder, including an elliptical cylinder; but the actual products produced have shape errors and position errors. The "main section of the handle" is the part of the handle where the connection groove A, connection hole A, connection groove B, and connection hole B are not set, and the length of the "main section of the handle" is greater than half the length of the handle body. For example, when the connection groove A and the connection groove B are set on the handle, the starting position of the "main section of the handle" is the end position of the connection groove A, and the end position of the "main section of the handle" is the end position of the connection groove B.

[0021] Note 9: Explanation of flat bodies: The thickness of an object is smaller than its length and width; a flat body has two end faces and a side face, and the side face is a combination of curved surfaces, or a combination of curved surfaces and planes, or a combination of planes and planes. Flat bodies include regular flat bodies and irregular flat bodies. Flat bodies other than regular flat bodies are irregular flat bodies. A regular flat body has the following characteristics: 1. Use any cutting plane perpendicular to the center line of the regular flat body to cut the regular flat body. The intersection of the cutting plane and the surface of the regular flat body is a closed intersection without head or tail. The intersection is the cross-sectional contour line of the regular flat body. Find points A, B, C and D on the cross-sectional contour line, so that the length of line segment AB is equal to the length of the figure, and the length of line segment CD is equal to the width of the figure. Then line segment AB and line segment CD are perpendicular to each other. The cross-sectional contour line is symmetrical with line segment AB as the axis of symmetry and line segment CD as the axis of symmetry. The length of line segment AB is greater than the length of line segment CD. The cross-sectional contour line is a combination of curves tangent to curves or curves tangent to line segments. Make any tangent to the cross-sectional contour line. The tangent has only one tangent point and no intersection with the cross-sectional contour line. 2. It has two end faces and one side face. The face between the two end faces is the side face. Cutting a regular flat body with any cutting plane passing through the center line of the regular flat body generates four intersection lines, and the four intersection lines form a rectangle or an isosceles trapezoid. The cutting plane and two end faces generate two intersection lines, and the cutting plane and one side face generate two intersection lines. When the four intersection lines form a rectangle, the regular flat body is a regular flat cylinder. When the four intersection lines form an isosceles trapezoid, the regular flat body is a regular flat cone. Objects with the above characteristics are regular flat bodies. An ellipsoid is a type of regular flat body. Cutting a regular flat body with any cutting plane perpendicular to the center line of the regular flat body, the intersection line between the cutting plane and the side face of the regular flat body is an ellipse, and the regular flat body is an ellipsoid. Cutting an ellipsoid with any cutting plane passing through the center line of the ellipsoid generates four intersection lines. The four intersection lines form a rectangle, and the ellipsoid is an elliptical cylinder. Or the four intersection lines form an isosceles trapezoid, and the ellipsoid is an elliptical cone.

[0022] 4. The handle body comprises a connecting piece at the left part, a tubular object at the middle part and a connecting piece at the right part, wherein the connecting piece at the left part is connected to the tubular object at the middle part as a whole, and the tubular object at the middle part is connected to the connecting piece at the right part as a whole; the connecting piece at the left part has a connecting groove A or a connecting hole A, or the connecting piece at the left part can form a connecting groove A or a connecting hole A; the connecting piece at the right part has a connecting groove B or a connecting hole B, or the connecting piece at the right part can form a connecting groove B or a connecting hole B; the bottom plate A and the bottom plate B each have a ball hitting part and a handle base, the handle base of the bottom plate A is installed in the connecting groove A or the connecting hole A, and the handle base of the bottom plate B is installed in the connecting groove B or the connecting hole B.

[0023] Note 10: When the connecting piece located on the left has a connecting groove A, the connecting groove A starts from the end face of the left end of the connecting piece located on the left and extends to the end face of the right end thereof for a distance that is smaller than the dimension of the connecting piece located on the left in the direction of the center line of the handle. When the connecting piece located on the left can form a connecting groove A, there are two connecting pieces located on the left, and the space between the two connecting pieces is the connecting groove A; two or more small connecting pieces can be used to replace any one of the connecting pieces, or four or more small connecting pieces can be used to replace the two connecting pieces, but this does not make economic sense. The connecting piece located on the right has the same structural features as the connecting piece located on the left, but the directions are opposite.

[0024] Use a perpendicular Fig.31 The cutting plane of the center line of the fourth integral handle body in the embodiment cuts the fourth integral handle body into section A and section B. The two anti-slip rings of the fourth integral handle body are in section B. Section A can be installed as a connecting piece in a tubular object with a shape and size suitable for the fourth integral handle body, which has a connecting hole A or a connecting hole B. Fig.52 The cutting plane of the center line of the sixth handle bar B in the figure cuts the sixth handle bar B into segments C and D, and the weight-reducing groove is located in segment D; the sixth handle bar A has the same structural features as the sixth handle bar B, and a cutting plane perpendicular to the center line of the sixth handle bar A cuts the sixth handle bar A into segments E and F, and the weight-reducing groove is located in segment F; then segments C and E can be used as connecting parts, and they are connected according to Fig.53 The connecting holes of the connecting parts can be installed in a tubular object with a shape and size suitable for them. The connecting shallow grooves of the C section and the E section together form a connecting hole A. The method of setting the connecting hole on the connecting part can also refer to Figure 29 to Figure 31 Method for setting connecting hole B in .

[0025] Note 11: The tube in the middle can be a whole tube or a tube composed of several parts. For example, in an ideal state, Fig.54 The tubular object in the middle is an elliptical cylinder. For another example, in an ideal state, Fig.90 The tubular object in the middle is composed of three parts: one is a section of elliptical tube on the left part of the first hollow racket handle; the second is a section of elliptical tube on the right part of the first hollow racket handle; and the third is a connecting tube, which is also an elliptical tube. The ideal shape of the tubular object is an elliptical tube; but the actual product has shape errors and position errors. Note 12: "The connecting piece located on the right is connected to the tubular object in the middle as a whole" can be done in many ways: 1. The connecting piece located on the right is produced as a whole with the tubular object, for example Fig.96The first type of hollow racket handle right part. 2. After the connecting piece located on the right part and the tubular object are produced separately, the two are connected into a whole. There are two ways of connection: one is to first connect the connecting piece located on the right part with the tubular object, and then install the handle base of the bottom plate B into the connection groove B; the other is to first install the handle base of the bottom plate B into the connection groove B of the connecting piece located on the right part, and then connect the connecting piece located on the right part with the tubular object. 3. The way of "the tubular object located in the middle part and the connecting piece located on the left part are connected into a whole" is similar.

[0026] Note 13: Explanation of regular flat tubes: Take a regular flat body as the substrate, and evenly apply a layer of material on the side of the substrate. The thickness of the layer of material is equal at all places. The end face of the A end of the layer of material is in the same plane as the end face of the A end of the regular flat body, and the end face of the B end of the layer of material is in the same plane as the end face of the B end of the regular flat body. Then the object formed by the layer of material is a regular flat tube; when the substrate is a regular flat cylinder, the object formed by the layer of material is a regular flat cylinder tube; when the substrate is a regular flat table, the object formed by the layer of material is a regular flat table tube. There are two side surfaces between the end face of the A end and the end face of the B end of the regular flat tube, and the area of ​​one side surface is larger than the area of ​​the other side surface. The former is the outer side surface of the regular flat tube, and the latter is the inner side surface of the regular flat tube. Elliptical cylinder tube is a type of regular flat tube. Explanation of elliptical cylinder tube: take an ellipsoid as the base, and evenly apply a layer of material on the side of the base, the thickness of the layer of material is equal at all places, the A end face of the layer of material is in the same plane with the A end face of the base, and the B end face of the layer of material is in the same plane with the B end face of the base, then the object formed by the layer of material is an elliptical cylinder tube; when the base is an elliptical cylinder, the object formed by the layer of material is an elliptical cylinder tube; when the base is an elliptical cone, the object formed by the layer of material is an elliptical cone tube.

[0027] Explanation of tubular objects: Tubular objects include regular flat tubes, irregular flat tubes and round tubes, and also include products that are deformed on the basis of regular flat tubes and round tubes; the shape of the product is irregular; the product has an A end, a B end, an A end face, and a B end face, and the product has an outer side face and an inner side face between the A end face and the B end face, and the area of ​​the outer side face is greater than the area of ​​the inner side face; the space enclosed by the inner side face of the product is connected to the outside world through its A end and through its B end. Flat tubes other than regular flat tubes are irregular flat tubes. One of the explanations of "tube" in the "Modern Chinese Dictionary": tube. The dictionary's explanation of "tube": something round and slender with a hollow space in the middle: a tap water pipe. The above-mentioned "tube" is actually a round tube.

[0028] 5. The handle comprises a hollow handle left part and a hollow handle right part; the left section of the hollow handle left part is provided with a coupling groove A or a coupling hole A, and the right section of the hollow handle left part is a tubular object; the right section of the hollow handle right part is provided with a coupling groove B or a coupling hole B, and the left section of the hollow handle right part is a tubular object; the right section of the hollow handle left part is connected to the left section of the hollow handle right part as a whole; or a coupling tube is provided, and the coupling tube is a tubular object; the left section of the coupling tube is connected to the right section of the hollow handle left part as a whole, and the right section of the coupling tube is connected to the left section of the hollow handle right part as a whole; the tubular object is a regular flat tube, or the tubular object has a shape error within 30% compared with the regular flat tube; the bottom plate A and the bottom plate B each have a hitting part and a handle base, the handle base of the bottom plate A is installed in the coupling groove A or the coupling hole A, and the handle base of the bottom plate B is installed in the coupling groove B or the coupling hole B.

[0029] Additional technical features are proposed for all the above technical solutions. Technical features A, B, C, D, and E can each define all the technical solutions:

[0030] A. The handle or the handle body is provided with a sub-handle, one end of the sub-handle is integrally connected to the handle or the handle body, the angle between the center line of the sub-handle and the center line of the handle is 25°-90°, or the angle between the center line of the sub-handle and the center line of the handle body is 25°-90°.

[0031] B. One or more annular anti-skid surfaces are arranged on the handle; any one of the annular anti-skid surfaces is formed by an anti-skid ring, or an annular anti-skid belt, or an annular anti-skid groove, or an anti-skid ring and an annular anti-skid groove, or an annular anti-skid belt and an annular anti-skid groove, or an anti-skid ring, an annular anti-skid belt and annular anti-skid groove; when a user holds the handle, the user's hand can contact any one of the annular anti-skid surfaces; any one of the annular anti-skid surfaces on the handle is cut with any one of the cutting planes passing through the center line of the handle to generate two intersection lines, and the length of the projection of any one of the intersection lines on the plane perpendicular to the center line of the handle is 0.5 mm-25 mm.

[0032] C. One or more annular anti-skid surfaces are arranged on the auxiliary grip; any one of the annular anti-skid surfaces is formed by an anti-skid ring, or an annular anti-skid belt, or an annular anti-skid groove, or an anti-skid ring and an annular anti-skid groove, or an annular anti-skid belt and an annular anti-skid groove, or an anti-skid ring, an annular anti-skid belt and annular anti-skid groove; when a user holds the auxiliary grip, the user's hand can contact any one of the annular anti-skid surfaces; any one of the annular anti-skid surfaces on the grip is cut by any cutting plane passing through the center line of the auxiliary grip to generate two intersection lines, and the length of the projection of any one of the intersection lines on the plane perpendicular to the center line of the auxiliary grip is 0.5 mm-25 mm.

[0033] D. An anti-slip cover is arranged on the handle or the auxiliary handle; the anti-slip cover comprises a cover base, which is a tubular object; one or more annular anti-slip surfaces are arranged on the outer side surface of the cover base, and any one of the annular anti-slip surfaces is formed by an anti-slip ring, or by an annular anti-slip groove, or by both the anti-slip ring and the annular anti-slip groove; any one of the annular anti-slip surfaces is cut by any cutting plane passing through the center line of the anti-slip cover to generate two intersection lines; the length of the projection of any one of the intersection lines on the plane perpendicular to the center line of the anti-slip cover is 0.5 mm-25 mm.

[0034] E. The A end region of the handle is provided with a flat and oblique anti-skid surface intersecting with the end surface of the A end of the handle, and the B end region of the handle is provided with a flat and oblique anti-skid surface intersecting with the end surface of the B end of the handle, and the angle between any one of the flat and oblique anti-skid surfaces and the center line of the handle is 25°-75°.

[0035] Note 14: The method for determining the center line of the secondary grip, the center line of the grip body and the center line of the anti-slip cover is the same as the method for determining the center line of the grip. The center lines described in this application are all straight lines. The intersection of two straight lines generates four angles, and the angle that is not greater than a right angle is called the angle between the two straight lines; when two straight lines are skew lines, one of the straight lines is moved parallel to the other straight line until it intersects with the other straight line, and then their angle is determined according to the above method.

[0036] Note 15: An anti-skid ring, an annular anti-skid belt and an annular anti-skid groove generally have two annular anti-skid surfaces, and both of the annular anti-skid surfaces have functions. For example, when hitting the ball with base plate A, one annular anti-skid surface of the anti-skid ring is used; when hitting the ball with base plate B, the other anti-skid surface of the anti-skid ring is used. Explanation of "annular anti-skid surface": The projection of the anti-skid surface on the handle on a plane perpendicular to the center line of the handle is annular. The present application considers that the ideal shape of the handle with an annular anti-skid surface is an elliptical cylindrical tube, so the ideal state of the annular anti-skid surface is that its projection on a plane perpendicular to the center line of the handle is an elliptical ring. Explanation of "elliptical ring": A large ellipse on a plane coincides with the center of a small ellipse and their major axes coincide, and the length of the major axis of the large ellipse minus the length of the major axis of the ellipse is equal to the length of the minor axis of the large ellipse minus the length of the minor axis of the ellipse, then the area between the two ellipses is an elliptical ring. "Elliptical ring" is derived by analogy from "circular ring". The center of a large circle coincides with that of a small circle, and the area between the two circles is a circular ring. When the sleeve base is installed on the handle, the inner side of the sleeve base contacts the side of the solid handle, or the inner surface of the sleeve base contacts the outer side of the hollow handle. Anti-skid sleeves made of materials such as rubber, latex or polyurethane are more practical. Flexible anti-skid sleeves are used to be installed on the handle or auxiliary handle of a table tennis racket. The rigid anti-skid sleeve is essentially a hollow handle body with an annular anti-skid surface, or it is directly connected to the handle or the handle body as a secondary handle to form a whole. When the rigid anti-skid sleeve is used as a hollow handle body, it can be produced as a single part with the connecting parts, or it can be produced separately and then installed together. A covering is installed on at least one hitting surface of the bottom plate A and the bottom plate B.

[0037] Beneficial effect: A table tennis racket with two bottom plates can be used to play table tennis with both a straight grip and a horizontal grip, and can quickly switch between the two grips when in use; thus, the advantages of the two grips can be brought into play and the disadvantages of the two grips can be avoided. The hand of the athlete A holding the racket handle is close to the bottom plate A. When the table tennis ball hit by the opponent is relatively close to the athlete A, the athlete A uses the bottom plate A and uses the straight grip to hit the table tennis ball; when the table tennis ball hit by the opponent is relatively far from the athlete A, the athlete A uses the bottom plate B and uses the horizontal grip to hit the table tennis ball. At this time, because the hand of the athlete A is close to the bottom plate A, the bottom plate B can be extended farther; therefore, no matter whether the table tennis ball hit by the opponent is far or near from the athlete A, the athlete A can quickly switch between the two grips to facilitate counterattack, and there is no blind spot in defense and counterattack, so the athlete A is in a very active position during the game. When the handle is provided with an anti-slip ring, the hand of athlete A holding the handle can be slightly away from the bottom plate A, and the handle can be rotated in the hand of athlete A to quickly adjust its direction. When the ping-pong ball hit by the opponent is relatively high, to the left of athlete A and close to athlete A, athlete A can quickly hit the ball with the front of bottom plate A, at which time the racket is in front and athlete A's arm is behind, the direction of the hit can be chosen arbitrarily, and the hitting speed is fast; if athlete A hits the ball with the back of bottom plate A, bottom plate A is behind and athlete A's arm is in front, the direction of the hit is limited, and the interval from the opponent's hit to the athlete A's hit is long, and the opponent has more time to prepare, which is disadvantageous to athlete A. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Most of the drawings in this application are not drawn strictly in proportion to the actual objects, because the sizes of the covering, base plate, etc. are very small, and drawing them strictly in proportion will make the graphics of some parts unclear. Figure 1 It is a front view of a first structure of a table tennis racket having two bottom plates; Figure 2 yes Figure 1 a top view of the structure shown; Figure 3 yes Figure 1 a left side view of the structure shown; Figure 4 yes Figures 1 to 3 A front view of the first base plate B; Figure 5 yes Figures 1 to 3 The left side view of the first base plate B in FIG. Figure 6 yes Figures 1 to 3 A top view of the first base plate B in FIG. Figure 7 yes Figures 1 to 3 A front view of the first handle bar B; Figure 8 yes Figures 1 to 3 A left view of the first handle bar B in FIG. Fig. 9 yes Figures 1 to 3 A top view of the first handle bar B in FIG. Fig.10is a front view of a second structure of a table tennis racket having two bottom plates; Fig.11 yes Fig.10 A partial A-direction view of the structure shown; Fig.12 yes Figure 10 to Figure 11 A top view of the third covering; Fig.13 is a front view of a third structure of a table tennis racket having two bottom plates; Fig.14 yes Fig.13 A top view of the third base plate B in FIG. Fig.15 is a front view of a fourth structure of a table tennis racket having two bottom plates; Fig.16 is a front view of a fifth structure of a table tennis racket having two bottom plates; Fig.17 is a front view of a sixth structure of a table tennis racket having two bottom plates; Fig.18 yes Fig.17 a top view of the structure shown; Fig.19 yes Fig.17 a left side view of the structure shown; Fig. 20 yes Figures 17 to 19 A top view of the fifth base plate A; Fig.21 yes Figures 17 to 19 A top view of the fourth base plate B in FIG. Fig. 22 yes Figures 17 to 19 A front view of the first overall handle body; Fig.23 yes Figures 17 to 19 A left side view of the first overall handle body; Fig.24 yes Figures 17 to 19 A top view of the first integral handle body; Fig.25 It is the front view of the second overall handle body; Fig.26 It is a left side view of the second overall racket handle body; Fig. 27 is a top view of the second overall handle body; Fig.28 is a schematic diagram of providing a second type of connection groove A on a third type of integral handle body; Fig.29 It is the front view of the fourth overall handle body; Fig.30 It is a left view of the fourth overall racket handle body; Fig.31 is a top view of the fourth overall racket handle body;

[0039] Fig.32 is a front view of a seventh structure of a table tennis racket having two bottom plates; Fig.33 yes Fig.32 The left side view of the anti-slip ring in FIG. Fig.34 yes Fig.32 A left side view of the annular anti-slip belt in FIG. Fig.35 is a front view of an eighth structure of a table tennis racket having two bottom plates; Fig.36 yes Fig.35 a top view of the structure shown; Fig.37 yes Fig.35 a left side view of the structure shown; Fig.38 yes Figure 35 to Figure 37 A front view of the sixth base plate A; Fig.39 is a front view of a ninth structure of a table tennis racket having two bottom plates; Fig.40 yes Fig.39 a left side view of the structure shown; Fig.41 yes Fig.39 a top view of the structure shown; Fig.42 yes Figure 39 to Figure 41 A front view of the B portion of the second combined hollow racket handle body; Fig.43 yes Figure 39 to Figure 41 A left side view of the B portion of the second combined hollow racket handle body; Fig.44 yes Figure 39 to Figure 41 A top view of the B portion of the second combined hollow racket handle body; Fig.45 yes Figure 39 to Figure 41 A left side view of the second combined hollow handle body; Fig.46 It is a front view of the main body of the third combined hollow racket handle; Fig.47 yes Fig.36 a left side view of the structure shown; Fig.48 yes Fig.36 a top view of the structure shown; Fig.49 It is a left view of the fourth type of combined hollow racket handle body; Fig.50 It is the front view of the sixth handle bar B; Fig.51 It is the left view of the sixth handle bar B; Fig.52 is a top view of the sixth handle bar B; Fig.53 It is a left view of the fifth combined hollow racket handle body; Fig.54 is a front view of a tenth structure of a table tennis racket having two bottom plates; Fig.55 yes Fig.54 a top view of the structure shown; Fig.56 It is a left side view of the structure shown in 54; Fig.57 yes Figure 54 to Figure 56 A front view of the first type of connecting member in; Fig.58 yes Figure 54 to Figure 56 A left side view of the first type of connecting member in FIG. Fig.59 yes Figure 53 to Figure 55 A top view of the first coupling member; Fig.60 yes Figure 54 to Figure 56 A front view of the second connecting member in FIG. Fig.61 yes Figure 54 to Figure 56 A left side view of the second connecting member in FIG. Fig.62 yes Figure 54 to Figure 56 A top view of the second coupling member; Fig.63 is a front view of the third type of connecting member; Fig.64It is a left side view of the third type of connecting piece; Fig.65 is a top view of a third type of coupling; Fig.66 It is a left view of the sixth combined hollow racket handle body; Fig.67 A front view of a fourth type of connecting member; Fig.68 is a left side view of the fourth type of connecting member; Fig.69 is a top view of a fourth coupling member;

[0040] Fig.70 It is a left side view of the seventh combined hollow racket handle body; Fig.71 is a front view of the fifth type of coupling; Fig.72 is a left side view of the fifth type of connecting member; Fig.73 is a top view of a fifth coupling member; Fig.74 It is a left view of the eighth combined hollow racket handle body; Fig.75 is a front view of a sixth type of coupling; Fig.76 is a left side view of the sixth type of connecting member; Fig.77 is a top view of a sixth coupling member; Fig.78 It is a left view of the ninth combined hollow racket handle body; Fig.79 is a front view of the seventh connection member; Fig.80 is a left side view of the seventh connecting member; Fig.81 is a top view of a seventh coupling member; Fig.82 It is a left side view of the main body of the tenth combined hollow racket handle; Fig.83 It is a front view of the first elliptical cylindrical tube with anti-slip ring; Fig.84 It is a left view of the first elliptical cylindrical tube with anti-slip ring; Fig.85 is a front view of a second type of elliptical cylindrical tube with an anti-slip ring; Fig.86 is a front view of the main body of the eleventh combined hollow racket handle; Fig.87 yes Fig.86 The main view of the main assembly in; Fig.88 yes Fig.86 A left view of the main assembly in FIG. Fig.89 yes Fig.86 A top view of the main assembly in FIG. Fig.90 It is a front view of the main body of the twelfth combined hollow racket handle; Fig.91 yes Fig.90 A left side view of the left part of the hollow racket handle; Fig.92 yes Fig.90 A top view of the left part of the hollow handle in FIG. Fig.93 yes Fig.90 A left side view of the first type of connecting pipe in FIG. Fig.94 yes Fig.90 A left view of the right part of the hollow handle in FIG. Fig.95 yes Fig.90 A top view of the right part of the hollow handle in FIG. Fig.96 This is a front view of the thirteenth combined hollow racket handle body; Fig.97 yes Fig.96 A left side view of the anti-slip cover; Fig.98 yes Fig.96 A top view of the anti-slip cover; Fig.99 yes Fig.96 A front view of an eighth connecting member; Fig.100 yes Fig.96 A left side view of an eighth connecting member in FIG. Fig.101 yes Fig.96 A top view of an eighth connecting member;

[0041] Fig.102 It is a front view of the main body of the fourteenth combined hollow racket handle; Fig.103 yes Fig.102 a left side view of the structure shown; Fig.104 The present invention is a front view of an eleventh structure of a table tennis racket having two bottom plates; Fig.105 yes Fig.104 a top view of the structure shown; Fig.106 yes Fig.104 a left side view of the structure shown; Fig.107 yes Figures 104 to 106 The front view of the seventh base plate; Fig.108 yes Figure 104 to Figure 106 A front view of a ninth connecting member; Fig.109 yes Figure 104 to Figure 106 A left side view of a ninth connecting member; Fig.110 yes Figures 104 to 106 A top view of a ninth connecting member; Fig.111 yes Figure 104 to Figure 106 A front view of a tenth type of connecting member; Fig.112 yes Figure 104 to Figure 106 A left side view of the tenth connecting member in FIG. Fig.113 yes Figures 104 to 106 A top view of a tenth connecting member in ; Fig.114 is a front view of a twelfth structure of a table tennis racket having two bottom plates; Fig.115 yes Fig.114 a left side view of the structure shown; Fig.116 yes Fig.114 a top view of the structure shown; Fig.117 yes Fig.114 A reduced schematic diagram of the sixth covering; Fig.118 It is a front view of a thirteenth structure of a table tennis racket with two bottom plates using a pen-hold grip (hereinafter referred to as the thirteenth structure); Fig.119 This is the left view of the thirteenth structure using the pen-hold grip; Fig.120 This is the front view of the thirteenth structure using the first horizontal grip; Fig.121It is the main view of the thirteenth structure using the second horizontal grip.

[0042] The markings in the figure are: 1. the first covering; 2. the first bottom plate A; 3. the first handle bar B; 4. the first bottom plate B; 4-1. the hitting part of the first bottom plate B; 4-2. the handle base of the first bottom plate B; 5. the first handle bar A; 6. the second bottom plate A; 7. the second covering; 8. the first overall handle; 9. the second bottom plate B; 10. the third covering; 11. the third bottom plate B; 12. the fourth covering; 13. the third bottom plate A; 14. the fourth bottom plate A; 15. the fifth covering; 16. the first overall handle body; 17. the fourth bottom plate B; 17-1. The hitting part of the fourth bottom plate B; 17-2, the handle base of the fourth bottom plate B; 18, the fifth bottom plate A; 18-1, the hitting part of the fifth bottom plate A; 18-2, the handle base of the fifth bottom plate A; 19, the anti-slip belt; 20, the anti-slip ring; 21, the sixth bottom plate A; 22, the fifth bottom plate B; 23, the second handle bar A; 24, the second handle bar B; 25, the third handle bar B; 26, the third handle bar A; 27, the sixth bottom plate B; 28, the fourth handle bar A; 29, the fourth handle bar B; 30, the fifth handle bar A; 31, the fifth handle bar B; 32, the sixth handle bar A; 33, the sixth 1. the first handle bar B; 34. the first connecting piece; 35. the elliptical tube; 36. the second connecting piece; 37. the third connecting piece; 38. the fourth connecting piece; 39. the fifth connecting piece; 40. the sixth connecting piece; 41. the seventh connecting piece; 42. the main assembly; 43. the first connecting tube; 44. the second connecting tube; 45. the first hollow handle right part; 46. the first hollow handle left part; 47. the eighth connecting piece; 48. the anti-slip cover; 49. the first auxiliary handle; 50. the main branch tube; 51. the ninth connecting piece; 52. the elliptical tube barrel; 53. the seventh bottom plate A; 54. the tenth connecting piece Components; 55, seventh base plate B; 56, eighth base plate A; 57, second auxiliary handle; 58, sixth covering; 59, integral hollow handle body; 60, fifth integral handle body; 01, A end face or B end face of first handle bar A or first handle bar B; 02, A end face or B end face of first integral handle body; 03, connecting groove B; 04, connecting groove A; 05, annular groove; 06, annular anti-slip surface; 07, flat and oblique anti-slip surface; 08, connecting hole A; 09, connecting hole B; 010 weight reduction notch; 011, connecting notch; 012, weight reduction groove; 013, connecting shallow groove. DETAILED DESCRIPTION

[0043] Combine the following Figure 1 to Figure 121The embodiments describe the ideal state of each table tennis racket, and the table tennis rackets produced according to these descriptions will inevitably have a certain error from the ideal state.

[0044] Figures 1 to 9 The first structure of a table tennis racket with two bottom plates includes a first bottom plate A, a first bottom plate B, a first handle bar A and a first handle bar B, which are connected into a whole by glue; the first bottom plate A and the first bottom plate B have the same structural features, both of which have a ball striking part and a handle base; Figure 4 In the embodiment, the handle base of the first bottom plate B is a rectangle surrounded by three dotted lines and three thick solid lines, and the rest is its hitting part; the first handle bar A and the first handle bar B have the same structural features; the handle base of the first bottom plate A and the handle base of the first bottom plate B are located between the first handle bar A and the first handle bar B, and the handle base of the first bottom plate A, the handle base of the first bottom plate B, the first handle bar A and the first handle bar B are combined into a racket handle; the ideal state of the racket handle is an elliptical cylinder, that is, Figures 1 to 3 The ideal state of the remaining part after the first bottom plate A and the first bottom plate B of the table tennis racket are completely cut off is an elliptical cylinder. The first bottom plate A and the first bottom plate B each have two hitting surfaces, and each hitting surface is a plane in an ideal state, and each hitting surface is provided with a first covering. In an ideal state, any hitting surface of the first bottom plate A is parallel to any hitting surface of the first bottom plate B. Figure 1 In the figure, the first handle bar B should have two transverse contour lines (ideally, the two transverse contour lines of the first handle bar A and the first handle bar B overlap), wherein the distance between the middle part of the upper transverse contour line and one transverse contour line of the handle base of the first bottom plate A and the handle base of the first bottom plate B is only 0.26 mm, and the distance between the middle part of the lower transverse contour line and the other transverse contour line of the handle base of the first bottom plate A and the handle base of the first bottom plate B is only 0.26 mm. In order to avoid blurring the figure, the middle part of the two transverse contour lines of the first handle bar B is omitted. The contour line of the right end face of the handle base of the first bottom plate A consists of a dotted line segment and two solid line segments, the upper end of the dotted line segment is connected to a solid line segment, and the lower end of the dotted line segment is connected to a solid line segment. Ideally, the three line segments are located on a straight line; but since the two solid line segments are very short, only one dotted line segment is used to replace the above three line segments. The contour line of the left end surface of the handle base of the first base plate B coincides with the contour line of the right end surface of the handle base of the first base plate A, so the contour line of the left end surface of the handle base of the first base plate B and the contour line of the right end surface of the handle base of the first base plate A are combined to form only a dotted line segment. Fig.35This situation also exists in the table tennis racket. Since this table tennis racket is about twice as heavy as the commonly used table tennis racket, it is necessary to find a way to reduce its weight. The methods are: first, reduce the wood thickness of the bottom plate A and the bottom plate B, and increase the thickness of the carbon fiber composite material on the bottom plate A and the bottom plate B; second, use carbon fiber composite materials to produce the handle bar A and the handle bar B; third, use carbon fiber composite materials to produce various hollow racket handle bodies and connecting parts, which greatly reduces their weight; plastic or wood plastic or wood can also be used to produce the above parts, which are slightly heavier and have a relatively low cost. Other shapes of bottom plates can also be used to replace the first bottom plate A or the first bottom plate B to make the two bottom plates different. Figure 4 The rectangular area enclosed by the midpoint dash line and the thick solid line is the handle base of the first bottom plate B, but the rectangular area can be adjusted according to the length of the first handle strip A and the first handle strip B. When in use: the hand of athlete A holding the handle is close to the first bottom plate A. When the ping-pong ball hit by the opponent is close to athlete A, athlete A uses the first bottom plate A and adopts the straight grip to hit the ping-pong ball; when the ping-pong ball hit by the opponent is far away from athlete A, athlete A uses the first bottom plate B and adopts the horizontal grip to hit the ping-pong ball. When switching from the straight grip to the horizontal grip, it is only necessary to adjust the position of the middle finger so that the grip of the middle finger is the same as that of the index finger, then the thumb, index finger, middle finger and palm hold the handle, that is, the front of these three fingers and the palm are in contact with the handle; the other two fingers are in a curled state, and their backs are in contact with or not in contact with the handle. Or when changing from pen-hold grip to horizontal grip, the front of the thumb, the front of the index finger, the side of the middle finger and the palm hold the handle. Therefore, the switching speed between pen-hold grip and horizontal grip is very fast. When switching grip, if the relative position relationship between the middle finger and the handle is changed, the hand holding the handle should shake backwards, and the relative position of the relevant fingers and the handle should be changed while shaking. When using bottom plate A for pen-hold grip, the middle finger can be held in the same way as the index finger; when switching to horizontal grip using bottom plate B, the relative position of the middle finger and the handle does not need to be changed. Other grips and switching methods are not excluded. When using the first base plate A to hit the ball using the pen-hold grip, the index finger can contact the A-end end surface of the handle A or the A-end end surface of the handle B, so the A-end end surface of the handle A and the handle B can each be used as an anti-slip surface; similarly, when using the first base plate B to hit the ball using the pen-hold grip, the B-end end surface of the handle A and the handle B can each be used as an anti-slip surface.

[0045] Figures 10 to 12The second structure of a table tennis racket with two bottom plates includes a second bottom plate A, a second bottom plate B and a handle; the handle can be regarded as being processed from an elliptical cylinder as the basic material; the left end face of the handle is not perpendicular to the center line of the elliptical cylinder before processing, and the second bottom plate A is bonded to the end face with a high-strength adhesive; the right end face of the handle is not perpendicular to the center line of the elliptical cylinder before processing, and the second bottom plate B is bonded to the end face with a high-strength adhesive; nails can also be used to increase the strength of the connection between the second bottom plate A and the second bottom plate B and the handle. The second bottom plate A and the second bottom plate B each have two hitting surfaces, and each of the four hitting surfaces is provided with a covering adapted to the shape of the hitting surface. The second bottom plate A and the second bottom plate B are both elliptical thin plates, and the third covering is also an elliptical thin object. Figure 13 to Figure 14 The third structure of a table tennis racket with two bottom plates is shown in FIG. Figures 1 to 9 The difference of the first structure shown is that the third bottom plate B is used to replace the first bottom plate B. The center line of the hitting part of the third bottom plate B and the center line of the first handle A are skew lines, and the angle between them is 1°-90°; Fig.13 As shown in the figure, one of the hitting surfaces of the third bottom plate B is in a vertical state and the center line of the handle is in a horizontal state, then the center of gravity of the third bottom plate B is located above the center line of the handle; in an ideal state, the center of gravity of the first bottom plate A is on the center line of the handle. A fourth covering is provided on each of the two hitting surfaces of the third bottom plate B. Fig.15 The fourth structure of a table tennis racket with two bottom plates is shown in FIG. Figure 13 to Figure 14 The difference of the third structure shown is that the third bottom plate A is used to replace the first bottom plate A. The angle between the center line of the hitting part of the third bottom plate A and the center line of the first handle A is 1°-90°; one hitting surface of the third bottom plate A is in a vertical state and the center line of the handle is in a horizontal state, then the center of gravity of the third bottom plate A is located above the center line of the handle. A fourth covering is provided on each of the two hitting surfaces of the third bottom plate A. The characteristics of the third bottom plate A are similar to those of the fourth covering. Fig.14 The bottom plates shown have the same features but in a different orientation. Fig.16 The fifth structure of a table tennis racket with two bottom plates is shown in FIG. Fig.13 and Fig.14 The difference of the third structure shown is that the fourth base plate A replaces the second base plate A. Fig.16 As shown in FIG. 1 , the center of gravity of the fourth bottom plate A is located below the center line of the handle, and the center of gravity of the third bottom plate B is located above the center line of the handle. Fig.14 The bottom plates shown have the same features but in a different orientation. Figures 17 to 24The sixth structure of a table tennis racket with two bottom plates shown in the figure comprises a fifth bottom plate A, a fourth bottom plate B and a first integral handle body. The fifth bottom plate A and the fourth bottom plate B each have a ball striking portion and a handle base, and the fifth bottom plate A and the fourth bottom plate B each have two ball striking surfaces; the A end region of the first integral handle body is provided with a coupling groove A, and the B end region of the first integral handle body is provided with a coupling groove B; the handle base of the fifth bottom plate A is installed in the coupling groove A, and the handle base of the fourth bottom plate B is installed in the coupling groove B. Ideally, the cross section of the middle part of the first integral handle body is an ellipse. The plane where any one of the ball striking surfaces of the fifth bottom plate A is located is perpendicular to the plane where any one of the ball striking surfaces of the fourth bottom plate B is located, and the plane where any one of the ball striking surfaces of the fifth bottom plate A is located is parallel to the major axis of the ellipse. A fifth covering is provided on each of the two ball striking surfaces of the fifth bottom plate A, and a first covering is provided on each of the two ball striking surfaces of the fourth bottom plate B. Figure 25 to Figure 27 The second overall handle body shown is Figures 17 to 24 There are two differences compared with the first type of integral handle body shown: First, the connection groove A and the connection groove B of the second type of integral handle body are in the same direction. If the fifth type of bottom plate A and the fourth type of bottom plate B are installed on the second type of integral handle body, in an ideal state, the plane where any hitting surface of the fifth type of bottom plate A is located is parallel to the plane where any hitting surface of the fourth type of bottom plate B is located. Second, the side of the second type of integral handle body is provided with an annular groove, and the annular groove forms two annular anti-skid surfaces, namely the left side and the right side of the annular groove. When the fifth type of bottom plate A and the fourth type of bottom plate B are installed on the second type of integral handle body, when the fifth type of bottom plate A is used to hit the ball, the right side of the annular groove is used as the annular anti-skid surface; when the fourth type of bottom plate B is used to hit the ball, the left side of the annular groove is used as the annular anti-skid surface. Fig.28 The difference between the third integral handle body and the first integral handle body is that the direction of the connecting groove is different ( Fig.28 The directions of the connection grooves A and B are the same); if Fig.28 If the connection groove A in the Fig.23 The direction of the connecting groove A in is the same. Figure 29 to Figure 31 The fourth overall racket handle body shown Figure 25 to Figure 27The difference between the second type of integral handle body shown in the figure is as follows: the fourth type of integral handle body is not provided with an annular groove but is provided with two anti-slip rings and four flat and inclined anti-slip surfaces, and the fourth type of integral handle body and the two anti-slip rings are produced as one part; the fourth type of integral handle body is not provided with a connecting groove A and a connecting groove B but is provided with a connecting hole A and a connecting hole B; the connecting hole A is used to connect with the handle base of the bottom plate A, and the connecting hole B is used to connect with the handle base of the bottom plate B; for example, the first type of bottom plate A can be installed in the connecting hole A, but the shape and size of the matching parts of the two should be adapted; the third type of bottom plate B can be installed in the connecting hole B, but the shape and size of the matching parts of the two should be adapted. Figure 32 to Figure 34 The structure shown is Figures 17 to 24 The differences in the structures shown are: Figure 32 to Figure 34 The structure shown has an anti-skid ring and an annular anti-skid belt installed on the side of the handle (i.e., the side that the athlete holds with his hand during the game). Both of them have two annular anti-skid surfaces. Both can be made of materials with suitable elasticity, strength and flexibility such as rubber, latex or polyurethane, and then glued to the appropriate position on the side of the handle.

[0046] Figures 35 to 38 The structure shown is Figures 1 to 9 The differences of the structures shown are: first, the sixth base plate A replaces the first base plate A, and the fifth base plate B replaces the first base plate B; second, the second handle bar A replaces the first handle bar A, and the second handle bar B replaces the first handle bar B. The sixth base plate A has a ball striking part and a handle base, and the handle base extends from the right end to the left to the dotted line on the base plate, and the handle base has a weight-reducing notch. The fifth base plate B has the same features as the sixth base plate A, but in opposite directions. The difference between the second handle bar A and the first handle bar A is that the A end area and the B end area of ​​the second handle bar A are each provided with a flat and inclined anti-slip surface. The second handle bar B has the same features as the second handle bar A, but in opposite directions. The handle of the table tennis racket is a first type of combined hollow handle, which is composed of a second type of handle bar A, a second type of handle bar B, a handle base of a sixth type of bottom plate A and a handle base of a fifth type of bottom plate B; the second type of handle bar A and the second type of handle bar B constitute the first type of combined hollow handle body of this application. Figure 39 to Figure 45 The table tennis racket shown includes a third handle bar A, a third handle bar B, a fifth bottom plate A, four fifth covers, a sixth bottom plate B and two anti-slip rings. A third handle bar A and a third handle bar B form a second type of combined hollow racket handle body; a third handle bar A and a third handle bar B have their A end regions each provided with a connection notch, and the two connection notches together form a connection groove A; a third handle bar A and a third handle bar B have their B end regions each provided with a connection notch, and the two connection notches together form a connection groove B. Figure 42 to Figure 44The third handle bar B is shown to be located in a spatial rectangular coordinate system (the X-axis coincides with the center line of the third handle bar B), the notch in the A-end region of the third handle bar B extends rightwards with its A-end end surface as the starting position in the X-axis direction, and the notch extends downwards with its connecting surface as the starting position in the Z-axis direction; the notch in its B-end region is similar; Fig.42 The weight-reducing groove of the third handle bar B extends downward from its connection surface, and the size of the weight-reducing groove in the Y-axis direction is smaller than the size of the third handle bar B in the Y-axis direction. The third handle bar A has the same characteristics as the characteristic third handle bar B. The shapes and sizes of the connection notches and weight-reducing grooves are determined according to the materials of the third handle bar A, the third handle bar B, the fifth bottom plate A and the sixth bottom plate B, and are based on the standard that they can be used normally after being connected into a table tennis racket. When the table tennis ball hit by the opponent is relatively close to the athlete A, the athlete A uses the fifth bottom plate A to hit the ball and adopts the straight grip, with the index finger in contact with the left side surface of the left anti-slip ring, the thumb in contact with the left side surface of the right anti-slip ring (or the index finger and thumb in contact with the left side surface of the same anti-slip ring), and the side surface of the middle finger in contact with the rear side surface of the handle (or the front surface of the middle finger and the side back surface of the ring finger are in contact with the rear side surface of the handle); when the table tennis ball hit by the opponent is relatively far from the athlete A, the athlete A uses the sixth bottom plate B to hit the ball and adopts the horizontal grip, holding the handle with the front of the thumb, the front of the index finger, the front of the middle finger and the palm, or holding the handle with the front of the thumb, the front of the index finger, the side of the middle finger and the palm, or holding the handle with the front of the five fingers and the palm. When the pen-hold grip is changed to the horizontal grip and the handle is held with the front of the thumb, the front of the index finger, the front of the middle finger and the palm, the relative position of the middle finger and the handle changes, and the middle finger should change its position flexibly; when changing the grip, the hand holding the handle shakes backwards, and the middle finger changes its relative position with the handle. When the pen-hold grip is changed to the horizontal grip and the handle is held with the front of the five fingers and the palm, the relative position of the middle finger, ring finger and little finger with the handle changes, and when changing the grip, the hand holding the handle shakes backwards, and the middle finger, ring finger and little finger change their relative positions with the handle. When the horizontal grip is adopted, any finger can be in contact with the right side of any anti-slip ring to prevent slipping; even if no finger is in contact with the right side of any anti-slip ring, when the handle slides to a certain extent, the hand holding the handle will contact the relevant bottom plate, and the table tennis racket will not fly out. The first type handle bar A, the second type handle bar A, the first type handle bar B and the second type handle bar B can all be provided with weight-reducing grooves.

[0047] Explanation 16: Divide the side surface of the racket handle into four tile-shaped curved surfaces. One of the tile-shaped curved surfaces contacts the palm or the thumb web, and this part is the rear side surface. The two tile-shaped curved surfaces adjacent to the rear side surface are its left side surface and right side surface respectively, and the other tile-shaped curved surface is its front side surface; the surface on the finger that can contact the palm is its front surface, the two surfaces adjacent to the front surface are its side surfaces, and the other surface is its back surface; the side-back surface of a certain finger refers to the part where the side surface and the back surface of the finger meet.

[0048] Figure 46 to Figure 48 The third type of combined hollow racket handle body shown is composed of the fourth type of handle bar A and the fourth type of handle bar B. The difference between it and the second type of combined hollow racket handle body is: the direction of the connection groove B is different: if the fifth type of bottom plate A is installed in the connection groove A of the third type of combined hollow racket handle body and the sixth type of bottom plate B is installed in its connection groove B, then in an ideal state, one hitting surface of the fifth type of bottom plate A is perpendicular to one hitting surface of the sixth type of bottom plate B. Fig.49 The fourth type of combined hollow racket handle body shown is composed of the fifth type of handle bar A and the fifth type of handle bar B. The difference between it and the second type of combined hollow racket handle body is: the directions of the connection grooves are different ( Fig.49 the directions of the connection groove A and the connection groove B in Fig.49 are the same); if Fig.47 the connection groove A in Figure 50 to Figure 52 is rotated clockwise by 45°, then its direction is the same as that of the connection groove A in Figure 50 to Figure 52 The weight-reducing grooves of the sixth type of handle bar B shown have the same characteristics as those of the fifth type of handle bar B. Suppose Fig.53 Figure 50 to Figure 52 the sixth type of handle bar B shown is located in a three-dimensional rectangular coordinate system (the X-axis coincides with the center line of the sixth type of handle bar B). The dimension of the connection shallow groove in the X-axis direction in the A-end area of the sixth type of handle bar B is the length of the connection shallow groove, the dimension of the connection shallow groove in the Y-axis direction is the width of the connection shallow groove and this width is less than the dimension of the sixth type of handle bar B in the Y-axis direction, and the dimension of the connection shallow groove in the Z-axis direction is the depth of the connection shallow groove; the left view of the connection shallow groove in the A-end area of the sixth type of handle bar B is in the shape of a U or approximately U or the shape of a "匚" rotated counterclockwise by 90°; the characteristics of the connection shallow groove in the B-end area of the sixth type of handle bar B are the same as those of the connection shallow groove in its A-end area. Fig.53The fifth combined hollow racket handle body shown is composed of a sixth handle bar A and a sixth handle bar B; the sixth handle bar A and the sixth handle bar B have the same structural features, but are in opposite directions, that is, the connecting surface of the sixth handle bar A faces downward, and the connecting surface of the sixth handle bar B faces upward, and the two connecting surfaces are bonded into a whole with glue; the connecting shallow grooves in the A end area of ​​the sixth handle bar A and the sixth handle bar B are combined into a connecting hole A, and the connecting shallow grooves in the B end area of ​​the two are combined into a connecting hole B; if the shape and size of the hitting part of a certain bottom plate are compatible with the connecting hole A, then the hitting part of the bottom plate can be installed in the connecting hole A; if the shape and size of the hitting part of another bottom plate are compatible with the connecting hole B, then the hitting part of the bottom plate can be installed in the connecting hole B.

[0049] Figures 54 to 62 The tenth structure of a table tennis racket with two bottom plates shown in the figure includes a sixth combined hollow racket handle body composed of an elliptical tube, a first connecting piece and a second connecting piece. The ideal state of the second connecting piece can be regarded as a product of machining a connecting groove on the elliptical cylinder, the connecting groove takes the right end face of the elliptical cylinder as the starting position and extends toward the left end face of the elliptical cylinder; in the center line direction of the elliptical cylinder, the size of the connecting groove is smaller than the size of the elliptical cylinder. The ideal state of the first connecting piece can be regarded as a product of machining two flat and oblique anti-slip surfaces on the second connecting piece. The first type of connecting piece is installed in the A end area of ​​the inner surface of the elliptical tube (bonded with glue, the same below), and the second type of connecting piece is installed in the B end area of ​​the inner surface of the elliptical tube; the first type of connecting piece has a connecting groove A, and the second type of connecting piece has a connecting groove B; the fifth type of bottom plate A (an embodiment of a bottom plate A directly connected to a racket handle body) is installed in the connecting groove A, and the sixth type of bottom plate B (an embodiment of a bottom plate B directly connected to a racket handle body) is installed in the connecting groove B; the sixth type of bottom plate B has the same shape characteristics as the fifth type of bottom plate A, but the direction is opposite. The fifth type of bottom plate A and the sixth type of bottom plate B each have two hitting surfaces, and each of the four hitting surfaces is glued with a fifth type of covering. An elliptical tube can also be connected with two first type of connecting pieces to form a hollow racket handle body, and an elliptical tube can also be connected with two second type of connecting pieces to form a hollow racket handle body. Figure 54 to Figure 56 In the embodiment, if the elliptical cylinder tube is regarded as a racket handle body, the fifth base plate A is indirectly connected to the elliptical cylinder tube (ie, connected via the first connecting piece), and the sixth base plate B is indirectly connected to the elliptical cylinder tube (ie, connected via the second connecting piece). Figure 63 to Figure 65The difference between the third type of connecting member and the first type of connecting member is that the directions of the connecting grooves are different. If the first type of connecting member is installed in the A end region of the elliptical cylinder tube, and the third type of connecting member is installed in the B end region of the elliptical cylinder tube, the connecting groove of the first type of connecting member is the connecting groove A, and the connecting groove of the third type of connecting member is the connecting groove B, the fifth type of bottom plate A is installed in the connecting groove A, and the sixth type of bottom plate B is installed in the connecting groove B; then in an ideal state, one hitting surface of the fifth type of bottom plate A is perpendicular to one hitting surface of the sixth type of bottom plate B.

[0050] Fig.66 The third connecting member is installed in the A-end region of the elliptical tube of the sixth combined hollow racket handle body, and the B-end region of the elliptical tube can be installed with the first to seventh connecting members or other connecting members shown in the present application. Figure 67 to Figure 69 The fourth type of coupling member shown is different from the first type of coupling member in that the direction of the coupling groove is different. Fig.68 If the coupling groove in the coupling member is rotated counterclockwise by 32°, the direction of the coupling groove is the same as the direction of the coupling groove of the first coupling member.

[0051] Fig.70 The fourth connecting member is installed in the A-end region of the elliptical tube of the seventh combined hollow racket handle body, and the B-end region of the elliptical tube can be installed with the first to seventh connecting members or other connecting members shown in this application.

[0052] Figure 71 to Figure 73 The difference between the fifth connecting member shown and the third connecting member is that no flat and inclined anti-slip surface is provided. Fig.74 The fifth connecting member is installed in the A end area of ​​the elliptical tube of the eighth combined hollow racket handle body, and the first to seventh connecting members or other connecting members can be installed in the B end area of ​​the elliptical tube. Figures 75 to 77 The sixth connecting piece shown is a part of an elliptical cylinder; the elliptical cylinder is cut into a large piece and a small piece by a plane parallel to the center line of the elliptical cylinder, and the shape of the small piece is the shape of the sixth connecting piece. Fig.78 The A end region of the elliptical tube of the ninth combined hollow racket handle body is equipped with two sixth connecting pieces, and the two sixth connecting pieces form a connecting groove A; the B end region of the elliptical tube can be equipped with the first to seventh connecting pieces or other connecting pieces. Figures 79 to 81 The difference between the seventh connecting member and the sixth connecting member is that a flat and inclined anti-slip surface is provided on the seventh connecting member. Fig.82 The A end region of the elliptical tube of the tenth combined hollow racket handle body is equipped with two seventh connecting pieces, and the two seventh connecting pieces form a connecting groove A; the B end region of the elliptical tube can be equipped with the first to seventh connecting pieces or other connecting pieces. Figure 83 to Figure 84 The first type of elliptical tube with anti-slip ring is shown in Figure 54 to Figure 56An anti-skid ring is added to the elliptical tube in the embodiment, and the anti-skid ring has a left side and a right side, and both the left side and the right side are annular anti-skid surfaces. A first to fifth connecting piece is installed on the A end area and the B end area of ​​the inner surface of the first elliptical tube with an anti-skid ring, respectively, to form a combined hollow racket handle body; and two sixth connecting pieces or two seventh connecting pieces or a combination of a sixth connecting piece and a seventh connecting piece can also be used to replace one of the first to fifth connecting pieces, to form another combined hollow racket handle body. The body can be used to produce table tennis rackets.

[0053] Fig.85 The second type of elliptical tube with anti-slip ring shown in Figure 83 to Figure 84 The first type of elliptical tube with anti-slip ring has two anti-slip rings added to it. Fig.85 The three anti-slip rings and Figure 83 to Figure 84 The second type of elliptical tube with an anti-slip ring has the same features as the left side view. Fig.84 The second type of elliptical tube with anti-slip ring can be combined with the first to seventh types of connecting pieces to form a variety of combined hollow handle bodies for producing table tennis rackets, refer to the above paragraph Figure 83 to Figure 84 Description of the combination. Figure 86 to Figure 89 The eleventh combined hollow racket handle body is composed of a main assembly and a first connecting member; the first connecting member has a connecting groove B when used in this structure; the main assembly is connected into a whole by a connecting head located on the left, a connecting section located on the right and an elliptical cylinder tube with two anti-slip rings located in the middle; the characteristics of the connecting head are the same as those of the first connecting member. Figure 57 to Figure 59 The first type of connecting member shown has the same features; the first type of connecting member is installed on the inner surface of the connecting section; the connecting section has two small connecting grooves, and the two small connecting grooves and the connecting groove of the first type of connecting member together form a connecting groove B. Fig.86 The part where the middle main assembly contacts the first type of connecting piece is the connecting section; the connecting section can be regarded as a product of cutting four pieces of material from a section of elliptical cylindrical tube to produce two pressing grooves and two flat and inclined anti-slip surfaces (this description can only be regarded as a description of its structure rather than a description of its processing process); Fig.86 In the figure, the projection of the two pressing grooves on the main assembly coincides with the projection of the connecting groove B of the first connecting piece, the flat and inclined anti-slip surface on the upper right of the main assembly and the flat and inclined anti-slip surface on the upper right of the first connecting piece are located in the same plane, and the flat and inclined anti-slip surface on the lower left of the main assembly and the flat and inclined anti-slip surface on the lower left of the first connecting piece are located in the same plane. Figure 90 to Figure 95The twelfth combined hollow handle body shown includes the left part of the first hollow handle, the first connecting tube, the second connecting tube and the right part of the first hollow handle; the left part of the first hollow handle is connected as a whole by a connecting head of the left section and an elliptical tube with an anti-slip ring of the right section, and the characteristics of the connecting head are the same as those of the first connecting piece; the first connecting tube and the second connecting tube are both elliptical tubes; the right part of the first hollow handle is connected as a whole by a connecting head of the right section and an elliptical tube with a left section, and the characteristics of the connecting head are the same as those of the first connecting piece; the left half of the inner side surface of the first connecting tube is connected as a whole with the right end area of ​​the outer side surface of the elliptical tube with an anti-slip ring of the left part of the first hollow handle, and the right half of the inner side surface of the first connecting tube is connected as a whole with the left end area of ​​the outer side surface of the elliptical tube of the right part of the first hollow handle. The left half of the outer side surface of the second connecting tube is integrally connected to the right end area of ​​the inner side surface of the elliptical tube with an anti-slip ring of the left part of the first hollow handle, and the right half of the outer side surface of the second connecting tube is integrally connected to the left end area of ​​the inner side surface of the elliptical tube of the right part of the first hollow handle. In this embodiment, the first connecting tube or the second connecting tube can be eliminated, and the first connecting tube or the second connecting tube can be produced as a whole with the left part of the first hollow handle or the right part of the first hollow handle, so that many embodiments can be added. Figures 96 to 101 The thirteenth combined hollow handle body shown includes the eighth connecting piece, the first hollow handle right part and the anti-skid cover. The eighth connecting piece is connected into a whole by a connecting head of the left section and a thin elliptical tube of the right section. The characteristics of the connecting head are the same as those of the first connecting piece, and the thin elliptical tube can be replaced by a thin elliptical cylinder. The left end area of ​​the inner side surface of the elliptical tube of the first hollow handle right part is connected into a whole with the outer side surface of the thin elliptical tube of the eighth connecting piece, and the anti-skid cover is sleeved on the curved surface of the connecting head of the eighth connecting piece and the right end area of ​​the outer side surface of the elliptical tube of the first hollow handle right part. The anti-skid cover is connected into a whole by an elliptical tube and two anti-skid rings, each of which has a left side and a right side, and the left side and the right side are both annular anti-skid surfaces. The number of anti-skid rings on the anti-skid cover can be one or more, and the size of the anti-skid cover in the center line direction of the handle can be reduced or increased. The anti-slip cover made of rubber, polyurethane or latex has suitable elasticity and a very comfortable feel; the anti-slip cover can also be made of plastic or carbon fiber composite material or wood or wood plastic or aluminum alloy. Figure 102 to Figure 103In the fourteenth combined hollow racket handle body shown, the thin elliptical cylindrical tube of an eighth connecting member (with connecting groove A) on the left is installed in the A-end area of the inner surface of the main branch pipe of a three-way elliptical cylindrical tube (composed of a main branch pipe and a first sub-racket handle), and the thin elliptical cylindrical tube of an eighth connecting member (with connecting groove B) on the right is installed in the B-end area of the inner surface of the main branch pipe of the three-way elliptical cylindrical tube; one end of the first sub-racket handle is integrally connected to the left-middle part of the main branch pipe, and an anti-slip ring is provided on the first sub-racket handle; the eighth connecting member on the right has the same characteristics as the eighth connecting member on the left, only in the opposite direction. After connecting a bottom plate A and a bottom plate B to this combined hollow racket handle body to form a racket, when the five fingers or four fingers or three fingers of the athlete's hand hold the first sub-racket handle (in the way of making a fist), and one finger touches the inner side surface (the upper side surface in the figure) of the anti-slip ring, then it is possible to hit the ball with the bottom plate A and also hit the ball with the bottom plate B.

[0054] Figures 104 to 113 In the eleventh structure of a table tennis racket with two bottom plates shown, the first anti-slip sleeve is adhesively bonded to the outer side surface of the elliptical cylindrical barrel; the elliptical cylindrical barrel is a product obtained by adding an elliptical cylindrical plate to the right end of the elliptical cylindrical tube and producing the elliptical cylindrical tube and the elliptical cylindrical plate as a whole, and the elliptical cylindrical barrel is a hollow racket handle body; the ninth connecting member has a "匚"-shaped part and a regular flat columnar part, the "匚"-shaped part has a connecting groove A, and the regular flat columnar part is a section of elliptical cylinder, and the side surface of this section of elliptical cylinder is connected to the inner surface of the left-end area of the elliptical cylindrical barrel; the seventh bottom plate A is indirectly connected to the elliptical cylindrical barrel (that is, the handle base of the seventh bottom plate A is installed in the connecting groove A of the eighth connecting member); the tenth connecting member is "匚"-shaped, it has a connecting groove B, and its left end face is adhesively bonded to the end face of the B end of the elliptical cylindrical barrel; the seventh bottom plate B is indirectly connected to the elliptical cylindrical barrel (that is, the handle base of the seventh bottom plate B is installed in the connecting groove B of the ninth connecting member). The first anti-slip sleeve, the elliptical cylindrical barrel and the regular flat columnar part of the eighth connecting member together form the racket handle. Fig.107 Among them, the area enclosed by three dotted lines and one thick solid line is the handle base of the seventh bottom plate A. The seventh bottom plate B has the same characteristics as the seventh bottom plate A. Figures 114 to 117The eighth bottom plate A and the fourth bottom plate B of the table tennis racket shown are installed on one side of the integral hollow handle body (adhesive bonding, or connected with countersunk screws and then adhesive bonding); the second auxiliary handle is installed on the other side of the integral hollow handle body (the two are preferably produced as a whole, such as injection molding); the integral hollow handle body is a rectangular tube (ideal state), that is, the space inside the rectangular tube is a rectangular parallelepiped; the second auxiliary handle is an elliptical tube; a sixth covering is glued to the surface where one of the hitting surfaces of the eighth bottom plate A and the fourth bottom plate B is located, and a first covering is glued to each of the other hitting surfaces of the two; the eighth bottom plate A has the same features as the fourth bottom plate B but in opposite directions, and the two can be arranged according to Fig.117 As a whole production, but waste of material. Figures 118 to 121 The table tennis racket shown comprises a fifth integral handle body, an eighth bottom plate A, a fourth bottom plate B, two anti-skid rings and four first covers; when using the eighth bottom plate A for pen-hold grip, the thumb and index finger hold the handle and are in contact with the anti-skid surface of an anti-skid ring respectively, and the middle finger is in contact with the handle and the anti-skid surface of an anti-skid ring; when using the fourth bottom plate B for horizontal grip, the thumb, index finger and middle finger hold the handle (or the thumb and index finger hold the handle, and the side back or back of the middle finger, ring finger and little finger are in contact with the handle), and the thumb and index finger are in contact with the anti-skid surface of an anti-skid ring. In this way, the athlete can quickly switch between the pen-hold grip and the horizontal grip.

Claims

1. A table tennis racket with two bottom plates, comprising a bottom plate and a handle, characterized in that: The bottom plate includes bottom plate A and bottom plate B, and the handle has end A and end B; the bottom plate A is directly or indirectly connected to the handle or the handle body as a whole, and the bottom plate B is directly or indirectly connected to the handle or the handle body as a whole; the distance from the center of gravity of the bottom plate A to the end surface of the A end of the handle is smaller than the distance from the center of gravity of the bottom plate A to the end surface of the B end of the handle, and the distance from the center of gravity of the bottom plate B to the end surface of the B end of the handle is smaller than the distance from the center of gravity of the bottom plate B to the end surface of the A end of the handle.

2. A table tennis racket with two bottom plates according to claim 1, characterized in that: The bottom plate A and bottom plate B each have a hitting part and a handle base; the racket handle includes a handle bar A and a handle bar B; the handle bar A, the handle bar B, the handle base of the bottom plate A and the handle base of the bottom plate B are connected to form a racket handle, and the handle base of the bottom plate A and the handle base of the bottom plate B are located between the handle bar A and the handle bar B.

3. A table tennis racket with two bottom plates according to claim 1, characterized in that: The bottom plate A and the bottom plate B each have a ball striking portion and a handle base; the handle includes a handle bar A and a handle bar B, and the handle bar A and the handle bar B are connected to form a handle body; the handle body has a connecting groove A or a connecting hole A, and the handle body also has a connecting groove B or a connecting hole B, the handle base of the bottom plate A is installed in the connecting groove A or the connecting hole A, and the handle base of the bottom plate B is installed in the connecting groove B or the connecting hole B.

4. A table tennis racket with two bottom plates according to claim 2 or 3, characterized in that: The handle bar A is provided with a weight-reducing groove, which starts from the middle area of ​​the connecting surface of the handle bar A and extends to the large side of the handle bar A; the handle bar B is provided with a weight-reducing groove, which starts from the middle area of ​​the connecting surface of the handle bar B and extends to the large side of the handle bar B.

5. A table tennis racket with two bottom plates according to claim 2 or 3, characterized in that: The handle base of the bottom plate A and the handle base of the bottom plate B are each provided with a weight-reducing notch.

6. A table tennis racket with two bottom plates according to claim 1, characterized in that: The racket handle body includes a handle rod, which has a connecting groove A or a connecting hole A, and the handle rod also has a connecting groove B or a connecting hole B; the bottom plate A and the bottom plate B each have a hitting part and a handle base, the handle base of the bottom plate A is installed in the connecting groove A or the connecting hole A, and the handle base of the bottom plate B is installed in the connecting groove B or the connecting hole B.

7. A table tennis racket with two bottom plates according to claim 1, characterized in that: The racket handle body includes a connecting piece located at the left part, a tubular object located in the middle part and a connecting piece located at the right part, wherein the connecting piece located at the left part is connected to the tubular object located in the middle part as a whole, and the tubular object located in the middle part is connected to the connecting piece located at the right part as a whole; the connecting piece located at the left part has a connecting groove A or a connecting hole A, or the connecting piece located at the left part can form a connecting groove A or a connecting hole A; the connecting piece located at the right part has a connecting groove B or a connecting hole B, or the connecting piece located at the right part can form a connecting groove B or a connecting hole B; the bottom plate A and the bottom plate B each have a hitting part and a handle base, the handle base of the bottom plate A is installed in the connecting groove A or the connecting hole A, and the handle base of the bottom plate B is installed in the connecting groove B or the connecting hole B.

8. A table tennis racket with two bottom plates according to claim 1 or 2 or 3 or 6 or 7, characterized in that: The handle or the handle body is provided with a sub-handle, one end of which is integrally connected to the handle or the handle body, and the angle between the center line of the sub-handle and the center line of the handle is 25°-90°, or the angle between the center line of the sub-handle and the center line of the handle body is 25°-90°.

9. A table tennis racket with two bottom plates according to claim 1 or 2 or 3 or 6 or 7, characterized in that: One or more annular anti-skid surfaces are arranged on the handle, and any one of the annular anti-skid surfaces is formed by an anti-skid ring, or an annular anti-skid belt, or an annular anti-skid groove, or an anti-skid ring and an annular anti-skid groove, or an annular anti-skid belt and an annular anti-skid groove, or an anti-skid ring, an annular anti-skid belt and annular anti-skid groove; when a user holds the handle, the user's hand can contact any one of the annular anti-skid surfaces; any one of the annular anti-skid surfaces on the handle is cut by any cutting plane passing through the center line of the handle to generate two intersection lines, and the length of the projection of any one of the intersection lines on the plane perpendicular to the center line of the handle is 0.5 mm to 25 mm.

10. A table tennis racket with two bottom plates according to claim 8, characterized in that: One or more annular anti-skid surfaces are arranged on the auxiliary grip; any one of the annular anti-skid surfaces is formed by an anti-skid ring, or an annular anti-skid belt, or an annular anti-skid groove, or an anti-skid ring and an annular anti-skid groove, or an annular anti-skid belt and an annular anti-skid groove, or an anti-skid ring, an annular anti-skid belt and annular anti-skid groove; when a user holds the auxiliary grip, the user's hand can contact any one of the annular anti-skid surfaces; any one of the annular anti-skid surfaces on the auxiliary grip is cut by any one of the cutting planes passing through the center line of the auxiliary grip to generate two intersection lines, and the length of the projection of any one of the intersection lines on the plane perpendicular to the center line of the auxiliary grip is 0.5 mm-25 mm.

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