JP4736410B2 - Table tennis racket - Google Patents

Description

  The present invention relates to a table tennis racket.

A conventional table tennis racket is most commonly used in which a bar-shaped grip pattern is gripped by four fingers excluding the second finger and the hitting surface is controlled by the second finger (see, for example, Non-Patent Document 1). .
Some have four finger holes through which the second to fourth fingers pass through the grip portion (see, for example, Patent Document 1, Design Document 1, and Utility Model Document 1). Here, the grip refers to a portion that includes a grip pattern and that engages with a palm and a finger excluding a hitting surface.

  Further, the present inventor has improved the above prior art to increase the position of the finger hole of the second finger or to give a tapered bulge to the contact portion with the palm of the grip (Patent Document 2 and Design Document) 2).

A conventional table tennis racket will be described below with reference to Patent Document 2. This table tennis racket (hereinafter simply referred to as a racket) has four finger holes that pass from the second finger to the fifth finger in the grip part, and has a tapered bulge on the palm side of the grip part. Two finger holes are located at the first joint, and a constriction is provided between the ball striking surface and the grip.
Since this racket has four fingers constrained, it is possible to hit an accurate and fast ball only with one kind of four-stroke method. There are still unsolved problems with more advanced types.

Patent number: W09915244 Japanese Patent Application "2003-326861"

Design literature 1

Design Gazette "890968"

Design literature 2

Application "2003-33136"

Utility model document 1

Utility Model Gazette "Actual 6-30212"
http: // yasaka-jp. com / rc01. html (Yasaka Co., Ltd. catalog, May 26, 2004 website)

In the case of the conventional rod-shaped handle, there are the following problems.
(1) Because the grip handle is narrow and narrow, even if you try to grip the racket at the optimal position, it is difficult to determine in an analog way. Even if the position is fixed, the racket slips out while hitting, or the racket tilts. Changed and my palms were sweating. For that reason, he always held strong force during practice and games, and always put power in his hands, wrists, arms and shoulders. As a result, after hitting the ball for many days for a long time, significant fatigue occurred in the order of hand, wrist, elbow and shoulder. Moreover, fatigue remained for a long time. In addition, he developed tendonitis while practicing for a long time.

(2) At the moment when the ball hits the racket, the shock wave was not easily conducted through the grip skin with a small surface area and was easily absorbed inside. For this reason, it was difficult for the fingertips to detect the shock wave, and it was difficult to understand the position and strength of the shock, and it was very difficult to learn how to prepare for the next shot.
(3) The moment when the ball hits the end of the hitting surface is easy to work, the racket is shaken, and the hitting ball is easily deflected. (4) Some grips have a cavity (Non-Patent Document 1). Since it is opened with a drill from the opening, it is not possible to reduce the weight sufficiently. Furthermore, by creating a cavity in the rod-shaped grip, the vibration transmission member is further narrowed, and it is difficult to obtain a delicate feel at impact such as the position and strength when the ball hits by vibration information.

The racket having four finger holes in the grip has the following problems (Design Document 2).
(1) There was only a two-point support function in which all four fingers were restrained and the first finger and the remaining four fingers were combined. For this reason, each finger did not function sufficiently, such as manipulating the racket quickly and freely and using all the striking methods. For example, the gripping hand is changed, the racket is rotated along the hitting surface, and the ball is rotated at a high speed. Instantly change the racket's tilt and direction, and prepare for all striking methods. Depending on the situation, it was not possible to hit the ball with good stability, power, accuracy and drive.
(2) The grip is large and heavy. Since the racket center of gravity moves closer to the grip, the racket center of gravity moves away from the hitting position. The speed and racket control was not enough.
(3) The size of the four finger holes must be taken into consideration, and various grip sizes are required. For this reason, the types of rackets have increased and become complicated and expensive.
The present invention has been made to solve the above problems.

Means to solve the problem

  A grip with an appropriate size and shape for engaging the first finger was provided on the grip. The bump is a protrusion having a sufficient aspect to engage freely and smoothly over the entire length from the tip of the first finger to the base and to receive the pressure of the first finger during operation. The shape of the protrusion is not limited to the raised bump, and can be arbitrarily selected from a partial sphere, a key shape, a saddle shape, a truncated cone shape, and may be a fixed type or a rotary type.

  A collar portion is provided in the vicinity of the periphery of the ball striking surface to engage with the third finger. The buttocks have a three-point triangular support structure having a suitable distance W from the bump that engages the first finger, and in cooperation with the grip points of the fourth and fifth fingers.

  On the ball striking surface side of the bump that engages with the first finger, the angle α formed by the inclined surface in contact with the first finger and the ball striking surface was 90 degrees or more and 135 degrees or less. The reason is to effectively receive the pressing force of the first finger during operation.

  Furthermore, an arch for restraining the back surface of the fourth finger and / or the fifth finger is provided in the grip portion of the fourth finger and the fifth finger. The reason is that advanced racket control is possible by using the back surface of the fourth or fifth finger.

  In addition to the above, if the inside of the grip was hollow like an egg shell, the weight could be reduced sufficiently. In addition, the transmission sensing of the impact vibration wave of the hit ball has been improved.

  The grip was formed by bonding the heel part and the arch into an integral structure, and the upper end part was 1.5 to 2.5 mm thicker than the ball striking face.

The invention's effect

We have solved all the problems that existed in the conventional rod-shaped handle. That is,
(1) Since the racket of the present invention has a wide grip and is caught, the positioning of the racket is digital and easy. Also, the racket does not slip, the tilt changes, and the palm does not sweat during play. Characteristic usage is to relax the fingertips, hands, arms and shoulders until just before hitting the ball. Next, at the moment when the ball hits the racket, the movement of the center of gravity and the rotational kinetic energy of the body are transmitted in the order of shoulders, arms, hands, and fingertips, and if you concentrate the force on the fingertips, you can make a wonderful swing. Therefore, the fatigue of fingertips, hands, wrists, arms, elbows and shoulders is remarkably low no matter how many days it is played. No fatigue remains. Even if hard practice continues for a long time, it does not cause tendonitis.

(2) A shock wave generated when the ball hits the racket instantly conducts through the hollow grip skin. This shock wave is detected by the five fingertips and the palm, and the position and strength of the generated shock wave can be instantly known. Therefore, the moment the ball hits the racket, the shock wave information is fed back through the fingertip and palm, so that the system for the next hit ball can be taken quickly.

(3) Since the grip is wide, the moment when the ball hits the end of the hitting surface is difficult to work, the racket is not shaken, and the hitting ball is difficult to escape.

  (4) Since the grip is a hollow like an egg shell, the weight can be extremely reduced. Further, a shock wave such as a ball hits the epidermis without being absorbed and is sensitively sensed by five fingertips and palms. As a result, it is possible to obtain a delicate feel when hitting a cut ball. In addition, delicate racket control, such as instant fine adjustment of the hitting direction, is facilitated.

In addition, the unresolved problem in the 4-hole grip was solved. That is,
(1) Because it has a structure that can demonstrate the functions and features of the five fingers, you can manipulate the racket quickly and freely, making full use of all the striking methods. For example, by changing the gripping hand, the racket can be turned along the hitting surface, and the ball can be rotated at high speed. In addition, you can quickly change the tilt and direction of the racket to prepare and play a system that matches any striking method. In this way, you can hit the ball with stability, power, accuracy, speed and drive.

(2) The number of finger holes is two or less, and it has a simple shape and a structure that can exhibit the functions and features of five fingers. As a result, the grip is small and light. The racket center of gravity moves closer to the head, bringing the racket center of gravity closer to the hitting position, improving stability, power, accuracy, and speed and racket control.

  FIG. 1 shows an embodiment according to claims 1 to 3 of the present invention. In FIG. 1, 2 is a ball striking surface, 3 is a grip, 4 is a bump, and 5 is a collar. The bump 4 has a smooth chevron that is held by the entire first finger during use. The angle α formed by the inclined surface 41 on the hitting surface side of the bump 4 with the hitting surface is a minimum of 95 degrees at the base, and a gentle phase is formed so as to be 160 degrees closer to the third finger collar. α is optimally 95 to 110 degrees at the base, and is best engaged with the first finger and is easy to slide. Α can be arbitrarily selected according to how the user grips and preferences. On the other hand, when α exceeds 135 degrees at the root, the original catching effect is reduced.

  The height H of the bump from the ball striking surface is 16 mm, and is an amount necessary to engage with the first finger and to become an effective hook when changing the gripping posture during use. The height H of the bump is appropriate to be 13 mm to 17 mm from the ball striking surface when a general adult male uses it. In the case of young people and women, the minimum height may be 10 mm. In the case of an oversized adult male, the appropriate height is 17 mm to 25 mm. If the height H is too high, it will get in the way when it hits the palm in the short shot method.

  In FIG. 1, the flange 5 is provided in contact with the outer periphery of the ball striking surface at the base of the ball striking surface of the grip. The shape of the heel portion 5 is a smooth heel shape so as to engage with the middle phalanx of the third finger and joint portions at both ends of the middle phalanx (so-called two joint portions at the center of the phalange). In FIG. 1A, the distance W from the root of the bump to the buttocks is 68 mm, but it is better to match the size of the individual hand. The curvature radius R of the buttocks is 10 mm, but it is desirable to match the thickness of an individual finger. Generally, it is in the range of 15 mm to 25 mm.

  FIG. 2 shows the most characteristic situation in the method of using the racket of FIG. In FIG. 2, (A) is a sketch of a general gripping hand shape of the foaming method as seen from the front. In this state, when the first finger is bent inwardly with the third finger as the center, and turning in the clockwise direction, the shape is as shown in (B), and the shape of the grip before entering the cut is obtained.

  The racket of this embodiment including FIG. 2 has the same usage as that of the second embodiment. Therefore, usage methods other than those in FIG. 2 will be described together in the second embodiment.

  3 to 8 show an embodiment according to claim 2. FIG. As shown in FIG. 3 (B), the bump 4 that engages the first finger near the ball striking face 2 of the grip 3, the flange 5 that is in the vicinity of the ball striking face and engages the third finger, Finger and fifth finger grips 6 and 7 are provided.

  The bump 4 is located in the vicinity of the ball striking face 2 on the front side of the racket, and has the same shape and dimensions as the first embodiment. The details of the three-dimensional shape of the bump 4 are indicated by contour lines in FIG. As the bump 4 approaches the gripping portion 6 of the fourth finger while drawing an arc, the gradient gradually becomes gentle. The bump 4 has a gentle slope as it approaches the lower end of the grip 3.

  The collar portion 5 is positioned near the periphery of the ball striking face at the upper end of the grip 3 and engages with the middle phalanx of the third finger and joint portions at both ends of the middle phalanx. In the present embodiment, the collar portion 5 is manufactured integrally with the arch 8 that restrains the fourth and fifth fingers. Moreover, the curvature radius r of the collar part 5 is 10 mm.

As shown in FIGS. 3 and 5, the gripping portions 6 and 7 are located near the lower portion of the heel portion 5 from the center of the grip, and are respectively engaged with the middle phalanx of the fourth and fifth fingers and the joint portions at both ends of the middle phalanx. Match. The hole diameter is preferably about twice that of the finger, and is 23 mm in this embodiment.
The function is one support point (O) that forms the basis of gripping and controlling the racket among the four-point support of the rhombus (FIGS. 7O, P, Q, and R). Pitching that occurs when the racket is turned is suppressed. Also, at the moment of hitting the ball, the fourth and fifth fingers vigorously grip the lower part of the grip, thereby generating a driving force for a strong and stable swing. In this way, it has important elements that are indispensable.

The arch 8 is used to softly support the backs of the fourth and fifth fingers, and has an integral structure together with the heel part 5, the gripping parts 6, 7 and the grip 3. The shape of the arch 8 integrally structured with the heel includes a spectacle bridge shape (FIG. 3), a single arch (FIG. 10B), and the like. The glasses shape (FIG. 10 (A)) is best, with the fourth and fifth fingers supported respectively.
The function of the arch 8 softly supports the backs of the fourth and fifth fingers during play, so that the racket can be relaxed and gripped. Also, when turning the racket, the arch is flipped up by the back of the fourth and fifth fingers. Thus, not only the fourth and fifth fingers but also the wrist, arm, elbow and shoulder have an effective relaxing function together with other components for a long time during play. Along with this, a smooth play can be performed with a stable and powerful swing.

Next, the usage method of the racket of this invention is demonstrated.
FIG. 7 (A, B) shows the position of the power point applied to the racket in the foaming method. Four points of diamond support (point O gripped by the fourth and fifth fingers, point P where the first finger engages the bump, point Q where the third finger engages the buttocks, and the second finger on the ball striking surface The point of contact R). This rhombus four-point support can freely change the movement, size, and direction of the power point. Therefore, the shape of the gripping hand of every striking method can be created digitally from this four-point diamond support.

  FIG. 8A and FIG. 8B show an example of a force vector acting on the rhombus four-point support. FO is a vector of the gripping force of the fourth and fifth fingers. FP is a force vector by the first finger. FQ is a force vector with the third finger. FS is a force vector by the second finger. When viewed from the front, each vector in the case of (A) is oriented and balanced at almost the center of gravity of the grip. When viewed from the top (B), a force vector acting in the direction perpendicular to the racket surface is displayed.

I will explain how the shape of the grips of all striking methods can be made digitally from this rhombus 4-point support.
The foaming method is the shape of a gripping hand that is taken when up (to play for the first time in order to get used to the body), and therefore becomes a diamond four-point support shown in FIG. The shape of the gripping hand of the foaming method is shown in FIG.
In the short hitting method, the point P is moved to the hitting spherical surface in the state shown in FIG. That is, if the first finger is protruded to the ball striking surface, a short hitting hand grip shown in FIG. 16 can be made.
In the fore-and-back striking method, the point P is moved to the step 31 in the state shown in FIG. That is, if a 1st finger | toe protrudes to the level | step difference 31, it will become a grip hand shown in FIG.
In the large swing swing method, when the point Q is moved to the back side (the fingertip of the third finger is moved to the back side) from the state shown in FIG. 7, the gripping hand shown in FIG. 18 is obtained.
In the cutting method, when the point P is brought close to the grip part 6 of the fourth finger along the bump 4 from the state shown in FIG. 7, the gripping hand shown in FIG. At this time, if the fingertips are extended so as to extend, the hand-grip of the cut hitting method shown in FIG.
In addition, a method of grasping the fourth and fifth fingers without passing through the grasping portions 6 and 7 regardless of the above-mentioned grasping hand. A gripping hand that holds the racket upside down by passing the first finger through the grip 6 from the back. A hand gripping the second finger on the buttocks 5 and the third and fourth fingers on the gripping portions 6 and 7. Penholder-type grip. It is possible to provide a variety of grips, and play is fun.

Hereafter, the effect of this invention in each hitting method is explained in full detail.
The forcing method will be described with reference to FIG. The shape of the gripping hand is to make a space in the palm (B), the fourth and fifth fingers are inserted into the gripping parts 6 and 7, the first finger is on the bump 4 and the third finger is on the buttock 5 Hook (A), the second finger naturally attaches to the back of the racket (C).
The shape of this gripping hand is characterized in that the ball striking face is inclined approximately 20 degrees clockwise with respect to the central axis of the arm (B). In this state, swing the shoulders, arms, hands, and fingertips using the movement of the center of gravity and the rotational movement of the body. Then, force is efficiently transmitted from the trunk to the racket, and a hit ball with a good drive can be obtained.
Also, not only the forcing method, but with this gripping hand, it is possible to perform a normal and strong swing with good stability such as normal driving, cutting and serving.

The short shot method will be described with reference to FIG. The gripping hand is shaped so that the first finger protrudes forward (FIG. 16 (A)) from the gripping form of the foaming method (FIG. 15), and the first and second fingers are brought closer to the front and back of the ball striking surface. Are shifted in opposite directions to each other (FIG. 16B).
In this way, the angle is determined quickly and digitally, and the ball striking face is instantly tilted counterclockwise within a range of approximately 30 to 35 degrees with respect to the central axis of the arm (FIG. 16B).
FIG. 16C shows the shape of the gripping hand of this short hitting method from the back.
In this state, if swinging while pushing forward so as to protrude the racket, the return ball due to the short can be accurately and stably with no vibration of the racket.

  In the case of both the fore-and-back batting method, the hand is tightened so that the first finger and the second finger are aligned so as to eliminate the space in the palm from the shape of the hand batting method (FIG. 15B). , B, C)), and the ball striking surface is almost in the same direction with respect to the central axis of the arm (FIG. 17 (B)). It can be powerful with stability and accuracy.

  In the case of large swing in the foam hitting method, the third finger is moved from the heel part 5 to the back of the hitting surface (FIGS. 18A and 18C) from the shape gripped by the foam hitting method (FIG. 15B). Because the surface sticks so that it is parallel to the palm (Fig. 18 (B)), the kinetic energy emitted from the trunk is instantly transmitted to the shoulders, arms, hands, fingertips and rackets, and the smash with drive is stable Can be strong and accurate.

In the case of the cut hitting method, the fingertip of the first finger is held by the fourth finger from the shape gripped by the foam hitting method (FIG. 15A), centering on the buttocks 5 engaging the third finger. Rotate in a clockwise direction while gripping it closer to the part 6 (At this time, if the arch 8 is lifted up by the backs of the fourth and fifth fingers, the rotational speed further increases). Then, the fingertip of the first finger slides toward the gripping portion 6 while drawing an arc on the bump 4, and the striking surface turns to a position of about 65 to 90 degrees clockwise with respect to the central axis of the arm ( FIG. 19).
When five fingers are loosened in this state, or five fingers are opened (FIG. 20) and the two arms are swung down, a high-speed rotating ball is generated.

Next, the utility is arranged for each characteristic structure of the present invention.
About Cobb 4
The smooth mountain-shaped bump 4 that engages the grip 3 with the first finger has a structure in which an arc is drawn toward the gripping portion 6 and is thinned in a tapered shape.
Since the bump 4 is easy to fit and slide on the first finger, it exhibits a characteristic function as in the above-described cutting method. Further, slipping off, slippage, and racket inclination are prevented.
Cobb 4 is located at one point P of the rhombus four-point support (FIG. 7O, P, Q, R), and when making various grips by directing the force vector of the first finger toward the center of the grip Create a driving point. It also balances with other force vectors to grip and control the racket. The action of the support point P is
(1) It has the most anti-pitching effect than other support points.
{Circle around (2)} The racket is turned around the flange portion 5 (the vector FP is increased) during the foaming method. Then, the rotation speed of the sphere increases and the drive is often applied. It is also a driving force point.

About buttock 5
The grip 3 is provided with a bump 4 that engages with the first finger, and is provided with a flange 5 that is in the vicinity of the periphery of the hitting surface and that engages with the third finger. The heel part 5 is located at one support point Q of the rhombus four-point support (FIGS. 7O, P, Q, and R), hooks the third finger with a U-shape, and cooperates with the bump 4 with an appropriate distance W. This is the structure.
The characteristic function of the heel part 5 is the center axis when the racket is turned (1). {Circle around (2)} Since the third finger is hooked on the U-shape, slipping, slipping, pitching, and racket tilt are prevented. Etc.
The effect of the support point Q is
(1) Since it has an appropriate distance W from the bump, it prevents side shake due to the external force of the ball collision.
{Circle around (2)} It has a pitching deterrent effect together with other supporting points.
(3) Located on the left side of the racket, it is one element for stable and powerful control.
(4) The angle of the ball striking surface can be finely adjusted in cooperation with the bump located at an appropriate distance W.

About the arch 8 The grip 3 is provided with the bump 4 that engages with the first finger, the flange 5 is provided in the vicinity of the periphery of the ball striking surface and engages with the third finger, and the arch that restrains the back surface of the fourth and fifth fingers. 8 is provided.
The function of the arch 8 is relaxed, along with other components, mainly not only for the 4th and 5th fingers, but also the wrist, arm, elbow and shoulder, for a long time during play. Supports the back of the 4th and 5th fingers to give a sense of security and improve play stability. In addition, slipping off, slippage and tilting of the racket are prevented.
The action of the support point O, that is, (1) direct the force vector of the fourth and fifth fingers toward the center of gravity of the grip and balance with other vectors.
{Circle around (2)} One of the four diamond supports (FIGS. 7O, P, Q, and R) has a pitching suppression effect.
(2) Located at the bottom of the racket, effective and stable racket control is effective.
The action of the arch 8 complements the action of the support point Q, and has the function of enhancing the independent functions of the fourth and fifth fingers. For example, the arch is soft (spatial) when the racket is swiveled clockwise in the cutting method (FIGS. 19A and 19B), when fingers are relaxed during play, or when serving. To support).

About the cavity
The structure of the grip 3 that is hollow like an egg shell is shown in FIGS.
Divided into two parts, a part 10 that forms an integral structure with the striking surface 2 and a part 11 that forms an integral structure with the bump 4, each of which is hollowed out like an egg shell, with the dowel 12 on one side and the other part on the other A hole 13 is formed to fit into the bottom. If the two divided grips are fitted together, a hollow with a thin skin can be formed inside the grip 3.
The function of the cavity is that the grip is extremely light, the center of gravity of the racket approaches the hitting position, and the grip skin that is hollow like an egg shell has different directions and strength when the ball hits the racket The effect that the shock wave is easily transmitted to the fingertip and palm instantly is that a delicate hitting feel such as the position where the ball hits and the intensity of vibration is experienced, and the system is prepared for the next hitting ball.

  If the vent hole 9 is provided in the center portion of the palm of the grip 3, the weight is further reduced and no sweating of the palm occurs at all. ), You can feel a comfortable grip. The shape of the vent hole may be circular or elliptical, but may be an animal shape or initial letters. In the case of a circular shape, the diameter is preferably 10 mm to 20 mm, but about 15 mm is optimal. In the case of an ellipse or an animal, the area is almost the same as a circle. In the case of a circle, if the diameter is 10 mm or less, the function as a vent hole is reduced, and if it is 20 mm or more, the feeling of fit of the palm to the grip is reduced, and vibration information transmitted through the skin of the grip is difficult to catch with the palm. .

  The thickness of the epidermis of the grip 3 that is hollow like an egg shell is preferably 1.5 mm to 4 mm. If the thickness is 1.5 mm or less, it is weak against external force. If it is 4 mm or more, it is strong against external force, but it is difficult to reduce the weight. Further, the minimum thickness may be about 1.5 mm when the material is maple or cocoon, but about 3 mm when the material is paulownia. The method of making the cavity may be divided vertically or horizontally as shown in FIG.

[0054]
1A is a plan view of a racket having a bump and a buttock. FIG. 1B is a right side view of a racket having a bump and a buttock. FIG. 2A is a grip diagram of a forcing method. (B) Grip diagram of the cutting method [Fig. 3] (A) Left side view of a racket having a bump, a collar, a gripping portion, and an arch [Fig.3] (B) A racket having a bump, a collar, a gripping portion, and an arch Front view [Fig. 4] Bottom side view of racket with bump, buttock, gripping portion, and arch [Fig.5] Front contour diagram of grip portion [Fig.6] (A) Coupling, ridge, gripping portion, arch and diverging Front perspective view of the racket [FIG. 6] (B) Rear perspective view of the racket having the bump, the heel part, the gripping part, the arch, and the end spread [FIG. 7] (A) Frontal plan view showing three-dimensional support points [FIG. B) Plan view showing four support points. [FIG. 8] (A) Force vector at three support points. [FIG. 8] (B) Plan view showing force vector at three-dimensional support points [FIG. 9] (A) Front view of racket with separate arch [FIG. 9] (B) Eyeglass bridge shape Front view of arch [FIG. 10] (A) Front view of spectacle-shaped arch [FIG. 10] (B) Front view of single arch [FIG. 11] (A) Sketch of vertically divided grip [FIG. 11] (B) Layout view of racket with vertically split grip [Fig. 12] Layout view of weight [Fig. 13] (A) Left side view of half grip [Fig. 13] (B) Plan view of half grip [Fig. 13] (C) Half Left side view of the split grip [Fig. 14] Bottom view of the half grip [Fig. 15] (A) Front view showing the gripping hand of the foaming method [Fig. 15] (B) Right side view of the gripping hand of the foaming method [Figure 15] (C) Rear sketch showing the gripping hand of the foaming method [Fig. 16] (A) Front plan view showing a grip hand of the cut batting method. [Fig. 16] (B) Right side sketch drawing of a hand grip of the cut batting method. [Fig. 16] (C) Shown a hand grip of the cut batting method. Rear view [Fig. 17] (A) Front view showing grip for both fore and back strokes [Fig. 17] (B) Right side view showing grip for both fore and back strokes [Fig. 17] (C) Rear view showing grip hand of both fore-and-back stroking method [FIG. 18] (A) Front view drawing showing hand grip of fore swing swing method [FIG. 18] (B) Right side sketch showing hand grip of fore swing swing method FIG. 18 (C) Rear sketch showing hand grip of fore swing swing method [FIG. 19] (A) Sketch drawing showing positional relationship between arm and racket after cutting [FIG. 19] (B) Arm and racket after cutting [Figure 20] (A) Nino FIG. 20 is a sketch showing the positional relationship between the arm and the racket after being cut by the arm. FIG. 20B is a sketch showing the positional relationship between the arm and the racket after being cut by the second arm. FIG. 21 is a catalog of the Yasaka Corporation. 1) Grip perspective view [Fig. 22] Perspective view of the racket of Design Literature 2 [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Table tennis racket 2 Hitting surface 3 Grip 31 Step 4 Cobb 41 Slope 5 Gutter part 6 Gripping part 7 Gripping part 8 Arch 9 Vent hole 10 End spread O, P, Q, R, S Symbol H which shows the position of rhombus four-point support Height from striking surface r Curvature radius W of heel part 5 Distance from root of root to heel part α Angle formed by slant surface in contact with first finger of hump and hitting surface

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Table tennis racket 2 Hitting surface 3 Grip 31 Level difference 4 Cobb 41 Slope 5 Gutter part 6 Gripping part 7 Gripping part 8 Arch 9 Vent hole 10 End spread O, P, Q, R, S Symbol indicating position of four-point support H Height from the striking surface r Curvature radius of the flange 5 W Distance from the root of the bump to the buttocks α Angle between the slant surface contacting the first finger of the bump and the hitting surface

Claims (1)

  In the table tennis racket composed of a ball striking surface and a grip, the grip has, on the front side, which is one ball striking surface, a bump that engages with a first finger that forms a chevron shape that rises smoothly in the vicinity of the ball striking surface, and a side surface A table tennis racket comprising an arch having a hole for inserting a fourth finger and a fifth finger on the side, and an butt portion engaging with a third finger having a curved shape near the periphery of the ball striking face.

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