CN111097147A

CN111097147A - Concave cylinder face table tennis bat

Info

Publication number: CN111097147A
Application number: CN201911288075.3A
Authority: CN
Inventors: 汤剑文; 卞保应; 王一帆; 冯枭慧; 徐跃
Original assignee: NANTONG INSTITUTE OF SPORTS SCIENCE
Current assignee: NANTONG INSTITUTE OF SPORTS SCIENCE
Priority date: 2019-12-15
Filing date: 2019-12-15
Publication date: 2020-05-05

Abstract

The invention provides a table tennis bat with a concave cylindrical surface, which is formed by gluing a bottom plate, sponge and rubber, wherein one or two bat surfaces are concave cylindrical surfaces, the thickness of each cross section parallel to a central cross section is consistent, the thickness of the symmetrical central cross section of the table tennis bat is thinnest, and the thickness of the symmetrical central cross section of the table tennis bat is gradually increased towards two sides; the radian of the concave cylindrical surface ranges from 3 degrees to 10 degrees. The racket of the invention has high ball receiving stability, the direction of the returned ball is easy to control, the speed of the returned ball can be changed more, and the racket is inconvenient for receiving the ball by hands.

Description

Concave cylinder face table tennis bat

Technical Field

The invention relates to a table tennis bat.

Background

The table tennis bat consists of a bottom plate, a rubber and a sponge. The reasonable combination of the three components determines the quality of a racket.

The performance index of the bottom plate is related to the shape, structure and material of the bottom plate. Therefore, when purchasing the bottom plate, not only the appearance and the number of layers but also the wood grain arrangement structure need to be seen; not only the sound needs to be heard, but also the fingers need to feel the softness and hardness of the music when the music is knocked; not only is the relevant index noted on the mat read, but the ball is also lifted with different forces in order to feel its force efficiency and overall performance.

The performance indexes of the rubber comprise a positive rubber and a reverse rubber, the rubber has a hard feeling when a ball is hit due to a large particle diameter, and the hitting feeling is soft due to a small particle diameter; the glue reversing speed is high when the particle density is high, and the glue retaining ratio is low.

The main considerations for sponges are hardness and thickness. "the thickness of the sponge is generally between 0.5 mm and 2.4 mm, and the hardness is between 30 degrees and 50 degrees. Generally, the harder and thicker the sponge is, the more elastic the sponge is, and the hitting speed is high, but the harder and thicker the sponge is, the better the sponge is, and thus not only is the racket too heavy, but also the sponge is too elastic and is not easy to control.

The traditional racket is in a left-right symmetrical and balanced shape no matter whether the traditional racket is round or square, however, most people searching for the characteristics of hitting balls by special-shaped rackets at home and abroad change the plate surface or the plate handle of the traditional racket; of course, by changing the shape of the handle and changing the "grip method", the way in which the ball is struck will vary significantly.

Disclosure of Invention

The purpose of the invention is as follows:

the invention provides a concave cylindrical table tennis bat which has the characteristics of accurate ball control direction, quick ball returning speed and entertainment.

The technical scheme is as follows:

the table tennis bat with the concave cylindrical surface is formed by cementing three parts, namely a bottom plate, sponge with one or two surfaces and rubber with one or two surfaces. The bottom plate is composed of a plate surface or a plate handle.

The table tennis bat is characterized in that the bat faces are symmetrically arranged along a central longitudinal section (a normal section from the top end of the bat handle to the lower end of the bat), one or two bat faces are concave cylindrical surfaces (namely, a cross section perpendicular to the central longitudinal section is provided with a concave arc line or two symmetrical concave arc lines, and the radiuses of arcs are equal everywhere), each longitudinal section parallel to the central longitudinal section is a section with equal thickness, the thickness of the symmetrical central section of the table tennis bat is the thinnest, the thickness of the symmetrical central section gradually increases towards the two sides, and the thickness of the two sides is the thickest.

The concave cylindrical surface is convenient for stably receiving table tennis, the direction of the returned table tennis is easier to control in a smaller area, and the table tennis can be ensured to fall on the table tennis table surface opposite to the table tennis table surface.

By establishing a geometric model and calculating according to the size of a standard table and the conventional size of a racket, the optimal value range of the radian of the concave cylindrical surface is 3-6 degrees. The approximate calculation process is as follows:

the standard table tennis table is 2740mm 1523mm in size, the standard table tennis bat is (154-160) mm (148-152) mm in size, and the net is 1830mm 152.5mm in size.

In the illustration of fig. 1, assuming that the location of the table tennis bat is centered on the edge of the table when playing the ball, the length of the table is 2740mm (farthest ball drop point) and the nearest ball drop point (about the length of the half table 1370+ the shaded area behind the net is about 152.5mm =1522.5 mm); the distance between the ball falling point and the bat is equivalent to the radius of the concave arc line of the cylindrical surface, the width of the table tennis bat takes the middle value of 150mm which is equivalent to the length of the arc line, and then the central angle (taking an integer) of the arc line:

ζ=(150/2740)*180/π~ (150/1522.5)*180/π≈3°~6°。

by combining the flexible rotation of hands and the distance between the ball receiving and serving positions and the ball table, larger allowance and value range can be set to be zeta = 2-10 degrees; even a new hand can easily catch the coming ball and counter hit the opposite ball table surface. For example, in order to increase difficulty and interest, the value range can be expanded to be zeta =10 ° -20 °.

The thickness of the rubber is uniform, the particles on the rubber are uniformly distributed everywhere due to the fact that the bat surface is a standard cylindrical surface with the same radian, and the particles are vertically arranged on the bat surface, so that the incident angle and the reflection angle of the table tennis are basically the same. This is in contrast to particles of a concave mirror (as described in the background document) which are pressed against each other and cannot be made perpendicular to the beat plane.

And the rubber on the racket surface of the cylindrical surface is easy to manufacture and bond, and the rubber can be actually curled to a certain radian by adopting common rubber. The rubber of the concave mirror beat surface can be realized by non-simple curling, a special die is needed for production and manufacturing, the manufacturing cost is higher, and the common rubber can not be simply deformed to form the tile mirror shape.

The sponge is flat, the surface of the bottom plate is provided with a single-sided or double-sided concave cylindrical surface and is formed by bonding a plurality of layers of films (rubber sheets or carbon fiber films or foam aluminum sheets), the film of the middle layer is provided with a concave cylindrical surface, and the rest are flat sheets (easy to manufacture and form and less in adopted arc-shaped templates). Thus, the force of hitting the ball is basically the same everywhere, and the utility model is suitable for players of various levels. The cylindrical radian of the racket surface is mainly determined by the bottom plate, so that the mechanical strength of the racket is higher.

Or the bottom plate is flat, the sponge is provided with a cylindrical surface with a concave single surface and is made of a single piece of sponge (the thickness is thicker, and the sponge is not easy to tear). Therefore, the hitting power of each part of the cross section is different, and the rebounded ball speed is changed at multiple ends, so that the opponent is difficult to catch the ball, and the golf tee is suitable for old hands. The curvature of the racket surface is mainly determined by the sponge. The sponge is easy to manufacture by adopting the mould, and the manufacturing cost of the racket is lower.

Has the advantages that:

the racket of the invention has high ball receiving stability, and is easy to be used by a new hand; the direction of the returned ball is easy to control and fall on the table of the opponent. And even if the force of the player is the same, the player can hit the ball by adopting different parts, the speed of returning the ball can be changed more, and the player is inconvenient to receive the ball by the hands.

Drawings

FIG. 1 is a schematic diagram of the calculation process of the optimal radian of the concave cylindrical surface of the invention;

FIG. 2 is a cross-sectional view of the racquet of FIG. 1;

fig. 3 is a schematic view of a longitudinal cross-sectional structure of the racket of fig. 1.

In the figure, 1-bottom plate (plate surface or plate handle), 2-sponge, 3-rubber, 30-particle and 100-concave arc line.

Detailed Description

The table tennis bat with a concave cylindrical surface as shown in fig. 2 and 3 is formed by sequentially gluing one rubber, one sponge, a bottom plate, the other sponge and the other rubber; the table tennis bat is a bat surface symmetrically arranged along a central longitudinal section, one or two bat surfaces are concave cylindrical surfaces, the thickness of each section parallel to the central section is consistent, the thickness of the symmetrical central section of the table tennis bat is the thinnest, the thickness of the symmetrical central section of the table tennis bat is gradually increased towards the two sides, and the thickness of the two sides is the thickest.

The radian of the concave cylindrical surface ranges from 3 degrees to 6 degrees. Each sponge is made of a single sponge, one surface of each sponge is a concave cylindrical surface, and the radian of the cylindrical surface of the racket surface is formed by the radian of the sponge.

Claims

1. A concave cylinder table tennis bat is formed by sequentially cementing a bottom plate, a sponge on one side and a rubber on one side, or sequentially cementing a rubber on one side, a sponge on one side, a bottom plate, a sponge on the other side and a rubber on the other side; the table tennis bat is a bat surface symmetrically arranged along the central longitudinal section, and is characterized in that: one or two racket surfaces are concave cylindrical surfaces, the thickness of each section parallel to the central section is consistent, the thickness of the symmetrical central section of the table tennis racket is the thinnest, the thickness of the symmetrical central section of the table tennis racket is gradually increased towards the two sides, and the thickness of the two sides is the thickest.

2. A concave cylindrical table tennis bat as defined in claim 1, wherein: the central angle zeta of the radian of the concave cylindrical surface ranges from 2 degrees to 10 degrees.

3. A concave cylindrical table tennis bat as claimed in claim 2, wherein: the radian of the concave cylindrical surface ranges from 3 degrees to 6 degrees.

4. A concave cylindrical table tennis bat according to claim 1, 2 or 3, wherein: the bottom plate is formed by bonding a plurality of layers of films, the film of the middle layer is provided with a concave cylindrical surface, and the cylindrical radian of the shot surface is mainly determined by the bottom plate.

5. A concave cylindrical table tennis bat according to claim 1, 2 or 3, wherein: the sponge is made of a single piece of sponge, one surface of the sponge is a concave cylindrical surface, and the radian of the cylindrical surface of the racket is mainly determined by the sponge.