JPH04231080A - Racket for ball game - Google Patents

Abstract

PURPOSE:To provide a racket for ball game which is good in repulsion enough to hit a rapid ball, and prominent in smoothness, adhesion and peeling-off of rubber and further weather resistance. CONSTITUTION:An outermost layer of a surface of a ball hitting part of a racket body of a racket for ball game is formed of fiber reinforced plastics.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a racket for ball games.

0002

2. Description of the Related Art Conventionally, plywood has generally been used in ball game rackets (hereinafter simply referred to as rackets), such as table tennis, in which the surface of the ball hitting portion of the racket body is flat. This is because it is easy to adjust the shape of the ball hitting part of the racket body, and it is also advantageous in terms of cost compared to a single-plate racket. Furthermore, in recent years, in order to increase strength etc., plywood using fiber reinforced plastic (hereinafter referred to as FRP) as one layer has come to be used.

0003

[Problems to be Solved by the Invention] However, in conventional rackets, the outermost layer constituting the surface of the main body is made of plywood, and the surface is not smooth enough, so it is difficult to replace the rubber affixed thereon. Another problem was that some of the adhesive might not come off, or conversely, new rubber might not adhere easily. It was also considered to improve the repulsion so that the ball could be hit even slightly faster, but since the plywood surface was made of wood, it was difficult to achieve such a large difference.

0004

[Means for Solving the Problems] As a result of intensive study, the inventor of the present invention found that conventionally FRP was used not as the outermost layer of the racket body but as one layer inside the plywood.
We focused on the fact that the smoothness and resilience of FRP's surface were not fully utilized. And the inventors simply F
The inventors discovered that by using RP on the surface of the racket body instead of reinforcing the plywood, it was possible to obtain a ball game racket with better smoothness and resilience than conventional products, resulting in the present invention.

[0005]An object of the present invention is to provide a ball game racket that has better repulsion than conventional products and allows for faster balls to be hit.Another object of the present invention is to provide a racket for ball games that has good repulsion properties and can hit faster balls than conventional products.
To provide a ball game racket which has excellent rubber adhesiveness and peelability, and is also excellent in weather resistance. This objective is easily achieved by a ball game racket in which the surface of the ball hitting part of the racket body is flat, and the outermost layer constituting the surface is formed of fiber-reinforced plastic. . The present invention will be explained in more detail below.

First, the ball game racket of the present invention is not particularly limited as long as the surface of the ball hitting part of the racket body is flat, but it is suitable as a racket for indoor and outdoor ball games such as table tennis, free tennis (Tenipong), etc. It is.

[0007] In the racket according to the present invention, the outermost layer constituting the ball hitting surface of the racket body is made of FRP. Resins used for FRP include (1) epoxy resin;
Thermosetting resins such as unsaturated polyester resins and phenolic resins, (2) nylon, polyethylene terephthalate (
Any thermoplastic resin such as PET), polybutylene terephthalate (PBT), or polycarbonate can be used. As the FRP fibers used in the present invention, various known fibers can be used, specifically carbon fibers,
Inorganic fibers such as glass fibers and organic fibers such as aramid fibers can be used, but carbon fibers are preferred. The strength, diameter, length, orientation, etc. of the fibers may be within the commonly used range. Various conventionally known methods can be used for molding FRP, and various methods using short fibers, long fibers, mats, etc. can be employed, but the prepreg method is particularly preferred.

In the ball game racket of the present invention, the outermost layer constituting the surface of the ball hitting portion of the main body is formed of FRP,
In addition, the structure of the ball hitting portion is not limited as long as it does not significantly impair the smoothness and resilience of FRP. However, considering that the ball is hit with the back of the racket, it is preferable that both the front and back of the ball hitting part be made of FRP. Furthermore, the layers that make up the interior of the ball-hitting part, that is, the parts that are not exposed to the surface, can have various configurations to reduce weight, but specifically, plywood, cork, aluminum, resin, etc. can be sandwiched inside. A so-called sandwich structure can be considered. In order to reduce the weight of these internal materials, it is preferable to use foamed materials or honeycomb materials. Of course, the internal layer may also be made of FRP.

The grip of the ball game racket of the present invention is not particularly limited as long as it does not significantly impede the effects of the present invention. The grip portion may have the same configuration as the ball hitting portion,
Also, considering the fact that a large force will be applied, it may be strengthened by any method. In order to manufacture the ball game racket of the present invention, it may be manufactured according to a conventional method, but specifically, two pieces of FRP are prepared for the front and back sides, and one of the FRP
It is generally manufactured by sequentially laminating internal materials on the top and finally bonding the remaining piece of FRP.

[0010] Rubber is usually pasted on the racket body of the present invention, and the method can be any conventional method. The present invention will be described below using Examples, but the present invention is not limited to the Examples unless it exceeds the gist thereof.

[0011]

[Example] Two pieces of epoxy resin prepreg with carbon fibers oriented in one direction were cut into the shape of a racket to obtain a cured FRP. A honeycomb material made of aromatic polyamide ("Nomex" manufactured by DuPont) was sandwiched between these two sheets of FRP. A pen holder-type table tennis racket was created using cork for the grip. When I applied rubber to this, it had excellent adhesion, and when I peeled the rubber off the racket, I was able to peel it off cleanly.

0012

[Effects of the Invention] According to the present invention, it is possible to obtain a ball game racket that has excellent repulsion properties, adhesion to rubber, and weather resistance.

Claims (2)

[Claims] 1. A ball game racket in which the surface of the ball hitting portion of the racket body is flat, wherein the outermost layer constituting the surface is made of fiber-reinforced plastic. 2. The ball game racket according to claim 1, wherein the fiber-reinforced plastic is a carbon fiber-reinforced plastic.