Novel straight-grip table tennis bat

Abstract

A novel straight-grip table tennis bat is characterized in that the bat is in an integral structural shape composed of a ball hitting plate, a bat shoulder, a bat neck and a bat handle, the ball hitting plate is basically oval, the bat shoulder is connected with the ball hitting plate, the bat neck is connected with the bat handle, the bat shoulder passes through the bat neck to the front portion of a handle strip of the bat handle and is gradually narrowed, and the front portion from the bat shoulder to the bat neck is wider than the rear portion of the bat handle. The front section of the handle strip of the racket neck is the narrowest part of the racket handle, two sides of the racket neck are concave curves inwards, the racket shoulder and the racket neck are integrally and obviously thinner than a traditional racket, the handle strip is in a wedge shape and is narrow in front, wide in rear, thin in front and thick in rear, the front end of the handle strip is narrower than the racket neck, and an upper handle strip and a lower handle strip of the racket handle are bilaterally symmetrical along the central axis, thick close to the central axis and thin on two sides. When the racket is held, the jaw obliquely faces the middle of the racket handle, the middle finger is naturally attached to the rear racket face, the thumb and the index finger clamp and buckle the racket handle in front of the racket, the ring finger and the little finger lean against the racket shoulder edge, and the two-face racket holding method is scientific, advanced and applicable.

Description

I. Technical Field of the Invention

[0001] The present invention relates to a new type of table tennis racket for straight grip. II. Background Art

[0002] Table tennis rackets include traditional straight rackets, square straight rackets, horizontal rackets and other new rackets. The traditional straight grip table tennis racket grip in my country is divided into fast attack grip, ball elimination grip and loop grip, but basically the base of the hand holding the racket is facing the racket handle, the middle finger, ring finger and little finger are inserted into the back of the hitting board to support the bottom plate, and the thumb and index finger are clamped in front of the racket to hold the racket handle. In the era when table tennis used a small ball with a diameter of 38mm, the traditional straight racket left push right attack had a brilliant record in international competitions. It still exists in large quantities in the market and is still used by many table tennis enthusiasts. Since 2000, when table tennis balls were replaced with large balls with a diameter of 40 mm, the diameter of the ball has increased by about 5.3%, the volume has increased by about 18%, and the mass of the ball has increased from 2.5 g to 2.7 g, an increase of 8%. The formula for the moment of inertia of a spherical shell with uniform mass distribution is J = (2 / 3) mR2, so the moment of inertia of the table tennis ball increased by more than 20% after it was changed from a small ball to a large ball. Even if the large ball we hit only needs to maintain the speed and rotation of the small ball, we still need to provide more translational kinetic energy and rotational kinetic energy to the table tennis ball, which means that more work needs to be done on the table tennis ball during the hitting process. Due to the large increase in the moment of inertia of the table tennis ball, it becomes more difficult to create and change the rotation of the ball. After switching to a larger ball, on the one hand, the speed of the table tennis ball when it is thrown is not easy to reach as high as that of a small ball. At the same time, the air resistance of the table tennis ball increases when it is flying in the air, and the flying speed of the ball slows down, so the rhythm of playing has slowed down. Now in the era of table tennis using large balls with a diameter of 40mm, watching table tennis games is dazzling, and the changes seem endless. However, when the table tennis ball is flying in the air, its orbit is basically a parabola due to the action of gravity. The entire table tennis ball has both a translational motion with the center of mass (center of the ball) and a rotation axis that rotates around the center of mass (center of the ball). The rotation axis has different spatial orientations, and the rotation has different strengths. Table tennis balls with different rotations fall on the table and hit the racket face, and there will be different rebounds. When we hit the ball with a table tennis racket, the point where the ball is acted upon by gravity is at the center of the ball, the magnitude mg remains unchanged, and the direction is vertically downward; if the racket and the ball come into contact and squeeze each other and deform, the racket will have an elastic force on the ball, and the point of action of the elastic force is at the contact point, and the magnitude of the elastic force is variable. The greater the deformation, the greater the elastic force, and the direction of the elastic force is from the contact point to the center of the ball; when there is elastic force between the racket and the table tennis ball, if the racket face and the table tennis ball have a tendency to move relative to each other along the tangent direction of the racket face, the racket face will have static friction on the table tennis ball, and the point of action of the static friction is at the contact point, and the magnitude of the static friction can be variable between zero and the maximum static friction, and the maximum static friction is equal to the static friction coefficient multiplied by the positive pressure elastic force, and the direction of the static friction passes through the contact point along the tangent direction of the racket face.When playing table tennis, for a table tennis ball with mass \(m\), the acceleration \(a\) of its center of mass, and the resultant force \(F\) of the gravitational force, elastic force, and frictional force acting on the ball, Newton's second law \(F = ma\) is obeyed. The composition of forces uses the parallelogram rule. The speed at which the table tennis ball flies out is related not only to its original speed but also to the acceleration and acting time generated by the racket. The operations all use the parallelogram rule. The magnitude and direction of the speed when the table tennis ball leaves the action of the racket determine its flight trajectory in the air. The intensity of the table tennis ball's rotation is described by the angular velocity \(\omega\) (of course, it can also be expressed by the rotational speed \(n\)). Only the frictional force of the racket on the table tennis ball has a torque \(M\). For the torque \(M\), moment of inertia \(J\), and angular acceleration \(\beta\) acting on the table tennis ball, the rotational law \(M = J\beta\) is obeyed. The angular acceleration and acting time determine the change in angular velocity, that is, the angular velocity of the hit table tennis ball is determined by its initial angular velocity, angular acceleration, and acting time. The operations here also use the parallelogram rule. When the elastic force is constant, since the static frictional force can vary between zero and the maximum static frictional force, this determines that the magnitude and direction of the resultant force of the racket on the ball, that is, the resultant force of the elastic force and the frictional force, are both variable. When the frictional force reaches the maximum static frictional force, the angle between the resultant force and the normal of the racket surface is the largest and the angle with the tangent of the racket surface is the smallest. I call the maximum angle between the direction of the resultant force of the racket on the ball and the normal of the racket surface (at this time, the angle between the resultant force and the racket surface is the smallest) the "critical angle". To hit the same incoming ball to different landing points on the opponent's table, it is necessary to adjust the magnitude and direction of the resultant force of the actual action of the racket on the ball. At this time, both the direction of the racket surface and the direction of swinging the racket to exert force need to be adjusted; even if the magnitude and direction of the required resultant force are determined, there can be different ratios of elastic force and frictional force, and the direction of the racket surface and the direction of swinging the racket to exert force can still be adjusted; the coefficient of friction between some new anti-spin rubbers and table tennis balls is between 2.0 and 2.5, and its maximum static frictional force is more than twice the elastic force. The maximum angle between the direction of the resultant force of the racket on the ball and the normal of the racket surface can reach 63° to 68°, that is, the minimum angle between the resultant force and the racket surface can reach 27° to 22°. The angle between the direction of swinging the racket to exert force and the racket surface is very small, commonly known as "brushing the ball very thinly", and the ball hit has a strong rotation; when using an anti-spin rubber with a large coefficient of friction, to hit balls with different rotation intensities, it can be achieved by adjusting the racket surface and its swinging direction; the coefficient of friction between some pimpled rubbers and table tennis balls is between 0.1 and 0.2, and its maximum static frictional force is only one-tenth to two-tenths of the elastic force. Its critical angle is between 15° and 10°. The angle between the direction of the resultant force of the racket on the ball and the normal direction of the racket surface is very small. When using this kind of rubber to play, it is neither easy to create the rotation of the table tennis ball nor easy to change the original rotation of the table tennis ball. The direction of swinging the racket should be basically consistent with the normal direction of the racket surface; the coefficient of friction of pimpled, long pimpled, and sandwich rubbers is very small and the elasticity is relatively large. When a strongly rotating table tennis ball hits such a rubber, it will slip in place, just like a car's wheels spinning but not moving in muddy ground. The ball hit back basically does not change its original rotation. Due to the reversal of the flight direction, the rotation also reverses. Topspin becomes backspin, backspin becomes topspin, left spin becomes right spin, right spin becomes left spin, left-sided underspin becomes right-sided topspin, and right-sided topspin becomes left-sided underspin.Everyone who plays table tennis always has to play with different people. Different opponents have different habits and hobbies, and the balls they hit have different properties. To reasonably respond to the balls with different properties, it is necessary to promptly adjust the direction of the racket face and the direction of the swing force. It is an objective need for the racket face of table tennis to be easy to adjust. There are many types of sponges and rubbers for table tennis, and different sponges and rubbers have different playing properties. If the sponges and rubbers pasted on both sides of the hitting board are different, and different racket faces are used to hit the ball during the playing process, it will make it more difficult for opponents to respond and is conducive to oneself obtaining better game results. The straight-grip table tennis racket with the patent number ZL201510621275.1 and the table tennis racket with the patent number ZL202222681230.1 invented by the applicant have outstanding substantive features and remarkable progress due to the innovative design of the racket handle shape and the gripping method. When the long handle bar faces the tiger's mouth in the gripping method, only the middle finger is extended along the racket handle into the hitting surface, the thumb and index finger clamp the racket handle in front of the racket face, and the ring finger and little finger are inclined against the shoulder and neck of the racket. This gripping method not only has the advantages of good power generation in the forehand and backhand positions of the traditional horizontal racket, large coverage, and strong mid-long distance confrontation ability, but also has the advantages of fast response and flexible handling of the ball in the net area with the same racket face in the forehand and backhand positions of the traditional straight racket. This essentially organically unifies the advantages of the traditional horizontal grip and straight grip. The latter makes the feeling control of the racket face more precise when gripping the racket than the former, which is conducive to improving the table tennis technology to the extreme. However, in the case of the front grip method of these two rackets, the handle bar close to the tiger's mouth is longer, and the shoulder and neck of the racket of my patented racket are thinner and longer than those of other traditional rackets. The front part of this longer handle bar was originally designed only to strengthen the force-bearing strength of the racket handle at the racket neck part. Under the existing technology, the material of the table tennis racket bottom plate is very good. When the width of the racket neck part of the table tennis racket is appropriately widened, the force-bearing strength of the racket neck can be guaranteed. In fact, the front part of the longer handle bar is a redundant obstacle. It has no beneficial effect when gripping the racket from the front, and it hinders the activities of the thumb and index finger when gripping the racket from the back. The different handle bars on both sides of the racket handle make it feel that it is not the best when switching the grip. Table tennis is a sport full of science and requires wisdom. To play table tennis well, one needs to understand relevant mechanics knowledge; the existing various table tennis rackets are not satisfactory. To further improve the technical quality of table tennis, enrich the tactical content of table tennis, enhance the actual combat ability of playing table tennis, promote the higher and better development of table tennis, for the physical health and happy life of the people, and for the national table tennis players to achieve new achievements and create new glories in international competitions, we need to invent and create a better new straight-grip table tennis racket. III. Summary of the Invention

[0003] The new straight-grip table tennis racket of the present invention is a racket for playing table tennis, characterized in that: the new straight-grip table tennis racket has an overall structural shape composed of a hitting board, a racket shoulder, a racket neck and a racket handle. The hitting board is basically oval. The racket shoulder is connected to the hitting board, and the racket neck is connected to the racket handle. From the racket shoulder through the racket neck to the front part of the racket handle strip, it gradually becomes narrower from wide. The front part from the racket shoulder to the racket neck is wider than the rear part of the racket handle. The racket neck is the narrowest part of the racket handle at the front section of the handle strip. The two sides of the racket neck are concave curves inward. The overall racket shoulder and racket neck are significantly thinner and longer than traditional rackets. The handle strip is in a split-tip shape, narrow in the front, wide in the rear, thin in the front and thick in the rear, and the front end of the handle strip is narrower than the racket neck. The upper and lower handle strips of the racket handle are symmetric about the central axis from left to right, thick near the central axis and thin on both sides. The upper and lower handle strips are symmetric with respect to the bottom plate. The surface of the racket handle strip is a convex curved surface, and the cross-section of the rear end of the racket handle is basically oval.

[0004] The new straight-grip table tennis racket of the present invention is a further improvement and perfection based on the straight-grip table tennis racket with the patent number ZL201510621275.1 and the table tennis racket with the patent number ZL202222681230.1 invented by the inventor himself. First, the front part of the longer handle strip is removed. The upper and lower handle strips are both in a split-tip shape, the same in size, length and thickness and symmetric with respect to the bottom plate surface. The overall racket shoulder and racket neck are significantly thinner and longer than traditional rackets. The racket neck is of appropriate width. The total length of the racket shoulder, racket neck and racket handle of this new straight-grip table tennis racket is longer than that of a traditional straight racket, but the length of the racket handle part is not longer than the length of the handle of a horizontal racket.

[0005] The new straight-grip table tennis racket of the present invention is further characterized in that the way of holding the racket is: the tiger's mouth is diagonally opposite the middle of the racket handle, the middle finger is attached to the back of the racket handle along the hitting board. The second and third joints of the middle finger can be naturally straightened or bent along the direction of the racket handle on the racket surface. The thumb and index finger bypass the racket neck and clamp the racket handle in front of the racket bottom plate. The ring finger and little finger are naturally bent and obliquely lean against the edge of the racket shoulder, and it is possible to hold the racket on the reverse side, and the two-sided holding methods are exactly the same.

[0006] The new straight-grip table tennis racket of the present invention inherits and develops the advantages of the racket of my previous patent. Whether it is the overall shape of the racket shoulder, racket neck and racket handle or the racket-holding method, it has outstanding substantive features and remarkable progress compared with the existing rackets. The overall structural shape of the racket handle and the racket-holding method are the crystallization of continuous exploration and improvement under the guidance of relevant mechanical theories and scientific ideas for a long time after the table tennis ball was changed to a large ball with a diameter of 40mm and have been tested by practice.The new straight-grip table tennis racket gradually narrows from the racket shoulder through the racket neck to the front of the handle bar. The front part from the racket shoulder to the racket neck is wider than the rear part of the handle. The racket neck is the narrowest part of the handle at the front section of the handle bar. This is to limit the forward movement of the entire gripping hand to avoid the need for the fingers to sink too deeply into the hitting surface. The overall racket shoulder and racket neck of the new straight-grip table tennis racket are significantly thinner and longer than those of other rackets. This is the basis for the new gripping method of this new straight-grip table tennis racket, where only the front section of the middle finger extends into the hitting surface and is in a straight line with the handle arm. The ring finger and little finger can naturally bend and lean against the edge of the racket shoulder. This gripping method has similarities with the traditional horizontal grip where only the index finger extends obliquely and adheres to the racket surface. It makes it easier to exert force in both the forehand and backhand positions during table tennis, has a large coverage area, strong mid-long distance rallying and confrontation capabilities. Moreover, extending the middle finger into the racket surface is more convenient for adjusting the racket surface than extending the index finger. The ring finger and little finger that naturally bend and lean against the edge of the racket shoulder can not only jointly control the racket surface but also boost the tangential movement of the racket surface when necessary, enhancing the intensity of table tennis rotation. The handle bar of this new straight-grip table tennis racket is in a shape of a split tip, with the front part of the handle bar being narrow and the rear part being wide, and the front being thin and the rear being thick. The front end of the handle bar is narrower than the bottom plate at the racket neck, making it natural and comfortable for the thumb and index finger to wrap around from the back to the front and clamp the handle. The gripping hand and the racket fit perfectly, which is beneficial for exerting force during the swing to increase the speed of the hit table tennis ball and is also conducive to the accelerated swing in the tangential direction of the racket surface to enhance the spin of the ball. After removing the front section of the relatively long handle bar of my original patent racket, the bottom plate has a relatively wide width at the racket neck. Coupled with the good material of the table tennis bottom plate under the existing technology, part of the force exerted by the gripping hand on the table tennis ball during playing is directly applied to the hitting surface through the middle finger extending into the hitting surface, enabling the racket to withstand the force intensity during playing at the racket neck. The space vacated by removing the front section of the long handle bar also allows the thumb and index finger to better sense and control the racket surface when holding the racket in an inverted position. The handle and the gripping hand are in the most scientific and reasonable state, which is not only conducive to improving the quality of the hitting technique but also facilitating the conversion between different technical movements to enhance the comprehensive response ability during playing. In the case of the new gripping method of this new straight-grip table tennis racket, the balls in the middle positions of both the forehand and backhand can be hit with the same side of the racket. This is the advantage that the traditional straight racket has a faster reaction speed than the traditional horizontal racket. Coupled with the fact that this new straight-grip table tennis racket can also exert full and effective force at each position as mentioned above, in fact, it organically combines the respective advantages of the traditional straight racket and the traditional horizontal racket. The handle bars on both sides of the handle are exactly the same and are the most scientific and reasonable and applicable, ensuring the best feel when switching grips on both sides and guaranteeing the high quality of different techniques during table tennis. The sponge and rubber on both sides of the hitting surface can be different. Different sponges and rubbers produce different ball performance. In this case, switching the hitting surface increases the tactical content and tactical combinations in table tennis, which will surely promote the higher and better development of table tennis.

[0007] The novel straight-grip table tennis racket of the present invention has outstanding substantial features and remarkable progress in its overall structure and gripping method compared with the prior art. Since the front part of the middle finger is extended into the hitting surface, the hitting board and the racket handle are in the same straight line with the arm, which facilitates the racket and the arm to keep parallel to the ground and make parabolic motion in the vertical plane, and the probability of hitting the ball can be increased by swinging the racket along the trajectory of the table tennis ball flying in the air; since the middle finger, the ring finger and the little finger are not all deeply sunken into the hitting surface to support the hitting surface, but only the front part of the middle finger is extended into the hitting surface, and the other fingers are at the relatively small racket shoulder and racket neck to control the racket surface, no matter it is hitting or rubbing the ball, the hitting surface has a larger movement amplitude than the fingers, and has an amplifying effect when playing, which meets the need of playing after the table tennis ball is changed to a large ball with a diameter of 40mm; When playing with the new straight-grip table tennis racket, the racket and the hand are highly integrated. The racket is a moderate extension of the hand, the hitting surface is like a human palm, and the neck of the racket is equivalent to a joint of the human body. When playing, the racket swinging and arm hitting action is more stretched and smooth, which better demonstrates the power of the whipping effect and makes the table tennis action more beautiful; this racket can stick sponges and rubbers with different performances on both sides of the hitting surface, and enriches and develops the technical and tactical content of playing table tennis by reversing the grip surface; the racket handle and the gripping hand can move relatively, and the backhand ball can be hit with either side of the hitting surface. This not only makes the new straight-grip horizontal hitting technology more applicable, but also increases the selectivity of one's return ball, and the hit ball is more sudden, which increases the difficulty of the opponent's prediction and response, which is conducive to one's own good results in the game. After table tennis balls were changed from small balls with a diameter of 38mm to large balls with a diameter of 40mm, the competition became more competitive and intense, the athletes had a larger range of movement, and the game was more exciting and entertaining. In the era of large balls, playing table tennis requires more skills. This is a new feature of the new era of table tennis and a manifestation of the vitality of table tennis. The new straight-grip table tennis racket has certain similarities in shape with a tennis racket in terms of the shoulder and neck positions. IV. Description of the drawings

[0008] Other details and features of the novel straight grip table tennis racket of the present invention can be clearly understood by reading the following detailed description in conjunction with the accompanying drawings. in: Figure 1 It is a front view of the new straight-grip table tennis racket of the present invention.

[0009] Figure 2 yes Figure 1 A side view of the novel straight grip table tennis racket of the present invention is shown.

[0010] Figure 3 yes Figure 1 A rear view of the novel straight grip table tennis racket of the present invention is shown. 5. Specific implementation methods

[0011] Reference Figures 1 to 3, the new straight-grip table tennis racket of the present invention is composed of a hitting board 1 and a handle 2; the hitting board 1 is composed of a sponge layer 12 and a rubber layer 13 on the upper and lower surfaces of a wooden bottom board 11; of course, according to the preferences of the players, the sponges and rubbers on the upper and lower surfaces of the bottom board can be the same or different; the handle 2 is composed of a handle 21 integrally made with the bottom board 11 of the hitting board and upper and lower handle strips 22, 23, 24 respectively pasted on the handle 21; from Figure 1 it can be seen the racket shoulders 3, 4, the racket necks 5, 6, the handle 21, the upper and lower handle strips 22, 23, 24. The racket shoulders are connected to the hitting board, and the racket necks are connected to the handle strips. The width gradually becomes narrower from the racket shoulders 3, 4 to the racket necks 5, 6. The racket shoulders and racket necks are significantly thinner and longer as a whole than traditional rackets. The front part from the racket shoulders 3, 4 to the racket necks 5, 6 is wider than the rear part of the handle. The racket neck is the narrowest part of the handle at the front section of the handle strip. The two sides of the racket neck are concave curves inward. From Figure 1 it can be seen the "U"-shaped isopach lines. The parts of the same "U"-shaped isopach line indicate the same thickness of the handle strips. The upper and lower handle strips are symmetric about the central axis of the handle, thick in the middle and thin on both sides. From Figure 1 and Figure 2 it can be seen that the handle strips of the handle are in a wedge shape, narrow in the front and wide in the rear, thin in the front and thick in the rear. The whole surface of the handle strip is a convex curved surface. From Figure 2 it can also be seen that the upper and lower handle strips of the handle are symmetric about the central plane of the bottom board, which is convenient for using the racket by turning it over. From Figure 3 it is obvious that the cross-sectional shape of the rear end of the handle 2 is similar to that of a traditional racket, basically oval; the overall structure of the handle ensures the stability, flexibility and good feel of the grip method of the new straight-grip table tennis racket; the ability to use it by turning it over is beneficial to the enrichment, development and improvement of table tennis techniques and tactics. The future of table tennis will surely be more wonderful.

Claims

1. A new straight grip table tennis racket, characterized by: The novel straight-grip table tennis racket is composed of an integral structure of a batting plate, a shoulder, a neck and a handle. The shoulder is connected to the batting plate, and the neck is connected to the handle. The front portion of the handle from the shoulder to the neck gradually becomes narrower, and the front portion from the shoulder to the neck is wider than the rear portion of the handle. The neck is the narrowest portion of the handle at the front portion of the handle, and both sides of the neck are concave curves inward. The shoulder and the neck are obviously longer and thinner than traditional rackets as a whole. The handle is in a split-point shape, which is narrow in front and wide in the back, thin in front and thick in the back, and the front end of the handle is narrower than the neck. The upper and lower handles of the handle are symmetrical along the central axis, thick near the central axis and thin at both sides, and the upper and lower handles are symmetrical to the bottom plate. The surface of the handle is a convex curved surface, and the cross-section of the rear end of the handle is basically elliptical.

2. A novel straight grip table tennis racket according to claim 1, characterized in that: The method of holding the racket is that the base of the thumb is diagonally facing the middle of the handle, the middle finger is pressed against the back of the bat along the handle, the second and third sections of the middle finger can be naturally straightened or bent along the direction of the handle on the racket face, the thumb and index finger go around the racket neck and clamp the racket handle in front of the racket base, the ring finger and little finger are naturally bent and leaned against the shoulder of the racket, and the racket can be held upside down, and the grip on both sides is exactly the same.

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