JPH0253074B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Conventional table tennis rackets can be broadly divided into a single-plate racket shown in the first figure and a plywood racket shown in the second figure. A single plate racket has a structure in which the plate body 2 of the racket body to which the grip 1 is attached is formed by a single plate of a predetermined thickness, and a plywood racket has a structure in which the plate body 2 of the racket body to which the grip 1 is attached is formed from a single plate of a predetermined thickness, and a plywood racket has a structure in which the plate body 2 of the racket body to which the grip 1 is attached is formed by a single plate of a predetermined thickness.
The racket body plate to which the grip 1 is attached is formed by polymerizing and bonding the rackets together with their fiber directions perpendicular to each other and bonding them together. Therefore, the single-plate racket and the plywood racket have different characteristics due to the difference in the structure of the plate of the racket body. In other words, in a single-plate racket, the plate body of the racket body is formed from a single plate with uniform fiber direction, so when hitting a ball that has hit the racket, the ball bites into the racket body to some extent, causing the ball to bite into the racket body. As a result, the contact time between the ball and the racket is longer than when using a plywood racket, and the ball can be hit while being captured by the racket. He is easy to control, has good ball flight distance, and can return a powerful ball. However, the repulsive force that strongly bounces back the flying ball is smaller than that of a plywood racket, so the initial velocity of the ball cannot be obtained compared to a plywood racket. On the other hand, a plywood racket has a structure in which the plate body of the racket body is made by polymerizing and bonding several thin plates with their fiber directions perpendicular to each other, so the repulsion force is stronger and the initial velocity is faster than that of a single plate. Therefore, it is possible to quickly return a fast-hitting ball. However, due to the structure, the bending is reduced, and as a result, the ball does not bite into the racket body, and you cannot get the feeling of hitting the ball with the racket catching the ball like you would with a single racket, and the ball does not bite into the racket body. The racket simply hits the surface of a hard board and is bounced off, and therefore, compared to a single-board racket, it is difficult to spin and control the ball, and the ball does not travel as far, making it less powerful. .

The present invention combines the good characteristics of the veneer racket and the plywood racket by devising the structure of the plate body of the racket body to which the grip is attached. To provide a table tennis racket capable of returning a ball with excellent power such as the speed of the ball and the rotation and elongation of the ball in addition to the good characteristics of the table tennis racket.

An example of implementing the present invention will be described with reference to FIG. 3 of the attached drawing. In the table tennis racket according to the present invention, the plate body of the racket body to which the grip 1 is attached is placed between the front and back outer plates 4, 4 of equal thickness, with a thickness of about 1/4 to 1/3 of the outer plate. With a core plate 5 interposed, both front and back outer plates 4,
4 and a core plate 5 are bonded together to form a three-layer structure. The fiber directions of the front and back outer plates 4, 4 and the core plate 5 are perpendicular to each other. Incidentally, when the thickness of the outer plate 4 is about 4 mm, the thickness of the core plate 5 is about 1.0 to 1.5 mm. As a result of experiments, it was found that when the thickness of the core plate 5 was about 1.5 mm or more compared to the thickness of the outer plate 4 of about 4 mm, very good effects were not obtained. The core plate 5 is not limited to a single plate, but may be divided into several thin plates and polymerized and bonded to have a total thickness of about 1 mm to 1.5 mm. The wood of the outer panel 4 is made of Japanese cypress as in the case of the veneer racket, but the wood of the inner core board 5 may be made of Japanese cypress or foreign materials such as those produced in the South Seas, Europe, or Canada. However, it is preferable that the hardness of the core plate 5 is equal to or slightly harder than that of the outer plate 4. Furthermore, the core board 5 is not limited to wood, but may also be made of carbon.

As described above, the present invention includes a racket body plate to which a grip is attached, and a center plate having a thickness of about 1/4 to 1/3 of the outer plate is interposed between the front and back outer plates of equal thickness. Since the racket is formed with a three-layer structure in which both the front and back outer plates and the core plate are bonded together, it has the following effects.

That is, unlike conventional plywood rackets, which have a structure in which several thin plates are glued together, a single core plate with a thickness much thinner than both outer plates is interposed between both outer plates. Because it is glued,
On the outer surface of the racket body, which the ball directly hits, there is a fairly thick outer plate with uniform fiber direction, so the flying ball bites into the outer plate in the same way as in the case of a single-plate racket. Unlike the case of a plywood racket, the bending of the outer surface plate is not reduced as the racket increases.

As a result, like a single-plate racket, the contact time of the racket with the ball can be made as long as possible, and the ball can be hit with the ball captured by the racket, making it easier to rotate and control the ball. He can return the ball with good distance and power. Moreover, unlike a simple single-plate racket, a thin core plate is interposed between both outer plates with the fiber direction perpendicular to it, so this core plate does not stop the bending of the outer plate, but pushes it. Trying to return it, that is,
It acts in a direction that provides a kind of resistance or so-called stamina against the bending of the outer surface plate, and as a result, a strong repulsive force is obtained as in the case of a plywood racket, and as a result, the initial velocity is lower than in the case of a single-plate racket. He can return the ball with great speed. In addition, in this case, the outer surface plate is bent and the repulsive force is enhanced, so the ball does not simply hit the racket and bounce back as it does with a plywood racket, but with a single-panel racket. He is able to return the ball with even more power compared to the former.

Since the structure of the racket is the same on both the front and back sides, the characteristics of the ball hit will be the same regardless of whether it is hit with either the front or back side. As mentioned above, the table tennis racket according to the present invention utilizes the good characteristics of the conventional single-panel racket, and also has the good characteristics of the plywood racket, so it The racket is suitable for use because it allows you to hit a ball that takes advantage of the advantages of both single board and plywood.

[Brief explanation of drawings]

Figure 1 is a side view of a conventional single-plate racket, Figure 2 is a side view showing one side of a conventional plywood racket, and Figure 3 is a side view of a conventional plywood racket.
The figure is a side view of a racket showing an example of the embodiment of the present invention. 1... Grip, 4, 4... Outer plate, 5... Core plate.

Claims (1)

[Claims] 1 Place the plate of the racket body to which the grip is attached between the front and back outer plates of equal thickness made of wood, and the thickness of the outer plate is about 1/4 to 1/3, and the hardness is the same or slightly harder than the outer plate. What is claimed is: 1. A table tennis racket characterized by having a three-layer structure in which a core plate having a core plate is interposed therebetween, and both front and back outer plates and a core plate are bonded to each other.