GB2179863A

GB2179863A - Racket stringing

Info

Publication number: GB2179863A
Application number: GB08521877A
Authority: GB
Inventors: Nan Lo Kun
Original assignee: Individual
Current assignee: Individual
Priority date: 1985-09-03
Filing date: 1985-09-03
Publication date: 1987-03-18
Also published as: GB8521877D0; GB2179863B; DE8525299U1; BE904332A

Abstract

A racket has intersecting strings forming a plurality of rectangular meshes, wherein the maximum diameter of the string is 1.2mm, and the intermediate portion of the strung area which is usually struck by the ball has at least 121 meshes per 100 sq. cm, whereby the vibration induced when a ball is stuck can be minimized and the player can strike the ball controllably. String tension may be 18-20 kg.

Description

SPECIFICATION Improvements relating to racket string web This invention relates to a racket and particularly to the string web of a racket.

In conventional racket constructions, the string web is made of a string of larger diameter, usually about 1.4 to 1.6mm and therefore it is not suitable to provide dense meshes in the web because the string with such dimension is rather rigid. The string web made of such string is less resilient, and when the ball strikes this kind of web, a strong vibration is induced in the racket which badly affects the feel of striking and causes fatigue to the player. In addition, it is not easy to control the direction of the ball when striking it.

An object of the invention is to provide an improved racket string web which improves the shock absorbing characteristic of the racket and allows the useer to control the ball effectively.

These and other objects can be achieved in accordance with the present invention through the provision of an improved string web having intersecting string lines forming a plurality of rectangular meshes, wherein the maximum diameter of the string is 1.2mm, and the intermdeiate portion of the web, which is usually struck by the ball, has about 121 meshes per 100 sq. cm, whereby the vibration induced when the ball strikes the web can be minimized and the ball can be struck more controllably by the web. The maximum size of each mesh is preferably 1 sq. cm and most preferably 81 sq.mm, and the tension of the string is maintained as 18 kg- 20kg.

The present exemplary preferred embodiment will be described in detail with the following drawings, in which: Figure 1 is an elevational view of the looped head of a racket incorporating a string web according to the present invention; Figure 2 is an elevational view of the looped head of a racket incorporating a conventional string web; and Figure 3 is a view illustrating how the string web responds when a ball strikes it.

Referring to Fig. 1, there is shown a looped head 10 of a racket frame holding a string web 20 formed of longitudinally and transversely extending string lines. The diameter of the string is about 1.2mm or less than 1.2mm which is 3/4 of the diameter of the string used in the conventional racket.

There are 26 transverse string lines and 22 longitudinal string lines which intersect to form 513 meshes. In the intermediate portion of the string web 20, which is usually struck by the ball, 121 meshes per 100 square centimeters are formed. Preferably, each mesh has an average size of 81 sq. mm and the tension of the string is maintained about 18-20 kg (40-45 Ibs). The string web with such a design possesses an improved shock absorbing characteristic and gives a good feel to the stroke.

Fig. 3 shows how the string web 20 acts when a ball 30 strikes it. The ball 30 strikes the string web 20 with a force F, and the player applies a force P to strike the ball 30.

The force F will be divided into a plurality of one-dimension force components F to act on points where the string and the ball contact.

The divided component forces F acting on the string web according to the invention are smaller in magnitude than the divided component forces resulting from the similar force F which is applied to a conventional racket. It can be explained by comparing the string web according to the invention with a conventinal racket string web.

The conventional racket frame 40 shown in Fig. 2 holds a string web formed of 9 transverse string lines and 16 longitudinal string lines intersecting to form 266 meshes and each mesh has a size of 174.2 sq. mm which is 1.8 times the mesh size according to the present invention. The diameter of the string is 1.4-1.6 mm. For the same striking area of 1 sq. inch (645.16 sq. mm) and for the racket frames of similar size and construction, the conventional string web has 3.7 meshes (645.16 sq. mm/174.2 sq mm), and the present string web has about 8 meshes (645.16 sq. mm/81 sq. mm) which is 2 times the number of the meshes of the convention string web. If the ball strikes both string webs with the same force F, the magnitude of each divided component is inversely proportional to the number of the meshes in the web.Therefore, the magnitude of each component force F acting on the string web according to the invention is smaller than that of each component force acting on the conventional string web. Moreover, since the string is smaller in diameter than the conventionally used string, it has less rigidity and more resiliency when it is stretched. The resilient string will produce opposing forces f as a result of the deflection to counteract the component force F when the ball strikes, thereby eliminating the generation of strong vibration in the racket frame. Consequently, the uncomfortable feel of striking can be eliminated and the ball can be struck controllably by the user. In addition, the string web with dense meshes is not susceptible to damage since the component force F acting on every point on the string web is reduced according to the invention.

With the invention thus explained, it is apparent that variations and modifications can be made without departing from the scope of the present invention. It is therefore intended that the invention be limited as indicated in the appended claims.

Claims

1. An improved string web for a racket having intersecting string lines forming a plurality of rectangular meshes, characterized in that the maximum diameter of the string is 1.2mm, and the intermediate portion of the web 20 which is usually struck by the ball has at least 121 meshes per 100 sq. cm, whereby the vibration induced when the ball strikes the web can be minimized and the player can strike the ball controllably.

2. An improved string web as claimed in Claim 1, wherein the maxinun size of each mesh is 81 sq. mm.

3. An improved string web for a racket having intersecting string lines forming a plurality of rectangular meshes, characterized in that the maximum diameter of the string is 1.2mm, and each mesh in the intermediate portion of the web 20, which is usually struck by the ball has a maximum size of 1 sq. cm.

4. An improved string web as claimed in Claim 3, wherein each mesh has a size of 81 sq.mm.

5. An improved string web as claimed in Claim 4, wherein the tension of the string is maintained as 18 kg to 20 kg.

6. An improved string web as substantially described hereinabove with reference to the accompanying drawings.