FR2586572A1 - Stringing of a racquet and racquet comprising such a stringing - Google Patents

Abstract

The improved stringing of the racquet 10 is equipped with lines of strings whose intersections form a large number of rectangular meshes, with a maximum string diameter of 1.2 mm. The central part of the stringing 20, which is usually struck by the ball, has at least 121 meshes per 100 cm<2>, thus minimising the vibration caused when the ball strikes the stringing, and rendering the ball struck by the player controllable. Use, particularly, in tennis racquets.

Description

The invention relates to a racket, and particularly to the screen of the racket. The invention also relates to a tennis racket comprising such a screen.

In conventional snowshoe manufacture, the sieve is made of large diameter rope, usually around 1.4 to 1.6 mm, and hence it is not appropriate to make tight stitches, since the rope of this dimension is rather rigid. The sieve made of this string is less elastic, and when the ball hits this kind of sieve, a strong vibration is induced in the racket, unpleasantly affecting the feeling of hitting, and causing + attic to the player. In addition, it is not easy to control the direction of the ball by hitting it.

One of the objects of the invention is to provide an improved racquet screen which improves the shock absorption characteristic of the racquet and allows the user to effectively control the ball.

The above object, as well as other objects, can be accomplished according to the present invention by the use of an improved screen, having lines of intersection of ropes forming a large number of rectangular meshes, such ropes having a maximum diameter of 1. , 2 mm, and the middle part of the screen, which is usually struck by the ball, having about 121 meshes per 100 cm2, thus making it possible to minimize the vibration induced when the ball hits the screen, and to strike the ball in a more controllable way . The maximum size of each stitch is preferably 1 cm2, and more preferably 81 mm2, and the tension of the rope is preferably kept around 18-20 kg.

The present preferred embodiment, given by way of non-limiting example, will be described in detail, with the accompanying drawings, in which
- Figure i is an elevational view of the loop-shaped head of a racket comprising a screen according to the present invention,
- Figure 2 is an elevational view of the loop-shaped head of a racket comprising a conventional sieve, and
- Figure 3 is a view showing how the screen responds when a ball hits it.

Figure 1 shows the loop-shaped test 10 of a racket frame carrying a sieve 20 formed of lines of strings extending longitudinally and transversely. The diameter of the string is approximately 1.2mm, or less than 1.2mm, which is 3/4 of the diameter of the string used in the conventional racquet. The screen comprises 26 lines of transverse ropes and 22 lines of longitudinal ropes whose intersections form 513 meshes. In the middle part of the screen 20, which is usually hit by the ball, there are 121 meshes per 100 cm2. Each stitch preferably has an average size of 81mm2, and the rope tension is maintained at about 18-20kg. The screen thus designed has an improved shock absorption characteristic, and gives a good feeling to the blow.

Figure 3 shows how the screen 20 acts when a ball 30 hits it. The ball 30 hits the screen 20 with a force F, and the player applies a force P to hit the ball 30. The force F can be broken down into several components F 'acting at the points of contact of the screen and the ball. The component forces F 'acting on the screen produced according to the invention have lower intensities than those of the component forces resulting from the same force F when it is applied to a conventional racket. This can be explained by comparing the sieve produced according to the invention with a conventional racket sieve.

The conventional racket frame 40 illustrated in Figure 2 supports a sieve formed of 19 transverse string lines and 16 longitudinal string lines whose intersections form 266 meshes, each mesh having a size of 174.2 mm2, or 1.8 times the surface of the mesh of the sieve according to the invention. The diameter of the rope is 1.4-1.6mm. For the same 1 square inch (645.16 mm2) hitting surface, and for mazes racket frames size and construction, the conventional sieve has 3.7 mesh (645.16 mu / 174.2 mm2), and the present sieve has about S meshes (645.16 mm2SSt mm2), which is twice the number of meshes of the conventional sieve.If the ball hits both sieves with the same force F, the intensity of each elementary component is inversely proportional to the number of mesh of the sieve. Therefore, the intensity of each component force F "acting on the sieve made according to the present invention is lower than that of each component force acting on the conventional sieve. In addition, since the rope has a smaller diameter than the rope. used conventionally, it has less stiffness and greater elasticity when stretched. The elastic string will produce opposing forces f resulting from deflection, to counteract the component force F 'when the ball strikes S thus eliminating the generation of a strong vibration in the racket frame. Therefore, the unpleasant feeling of hitting can be eliminated, and the ball can be hit in a controllable manner by the user. In addition, the dense mesh screen is not susceptible to suffering. deterioration, since the component force F 'acting on each point of the sieve is reduced, in accordance with the invention.

The invention being thus explained. it clearly appears that variants and modifications can be made to the screen according to the invention, without departing from the scope of the invention.

Claims (6)

1.Sieve improves for racket having lines of strings whose intersections form a large number of rectangular meshes, characterized in that the maximum diameter of the string is 1.2 mm, and that the middle part of the screen (20) which is usually hit by the ball comprises at least 121 meshes per 100 cm2, thus minimizing the vibration induced when the ball hits the screen, and making the ball hit by the player controllable. 2. Improved screen according to claim 1, characterized in that the maximum size of each mesh is 81 mm2. 3. Improved racket sieve with lines of strings intersecting with a large number of rectangular meshes, characterized in that the maximum string diameter is 1.2 mm, and each mesh in the middle portion of the sieve ( 20) which is usually struck by the ball, has a maximum size of 1 cm2. 4. Improved screen according to claim 3 characterized in that each mesh has a size of 81 mm2. 5. Improved screen according to claim 4q characterized in that the tension of the rope is maintained at 18 to 20 kq. 6. Tennis racket comprising a screen according to one of claims 1 to 5.