DE3141369A1 - Tennis racket - Google Patents

Abstract

In a tennis racket, a central area of the longitudinal strings and of the transverse strings consists in each case of plastic strings and the two remaining, lateral areas consist in each case of gut strings.

Description

"Tennis racket"

The invention relates to a tennis racket whose oval racket head is strung with crossing main and cross strings.

The covering of tennis rackets usually consists of intestine or made of plastic. Gut strings have greater elasticity compared to synthetic strings and lower durability, plastic strings are, conversely, less elastic, but more durable.

The invention is based on the object of a mixed covering to create gut strings and synthetic strings that take advantage of both materials to a greater extent than the disadvantages.

According to the invention it is provided for this purpose that each one Middle area of the main string covering and the cross string covering made of plastic strings exists and each the other two side panels made of gut strings exist.

Where the mentioned middle fields of the main string and the cross string cross each other, a rectangle is created in the center of the club head in which only find synthetic strings. In the adjacent areas of the The middle fields mentioned cross gut strings with the synthetic strings. In In the other four corner areas, the covering consists solely of casing.

Such a covering is just as durable as a pure plastic covering. There where a covering is most likely to tear due to the frequency of impacts, namely in the middle, it also consists exclusively of synthetic strings, and the through this most stressed zone consist of running and therefore most stressed strings also outside this zone, along its remaining length, made of plastic. The elasticity However, the covering is incomparably larger than that of a pure plastic covering. Because the rectangle in the middle, which consists exclusively of plastic strings, takes only a fairly limited proportion of the covered area and is all around partly half (in the four adjacent areas of the middle fields mentioned), partly completely (in the four corner areas in between) of gut strings and accordingly held elastic.

In addition, the covering produces a surprisingly increased Twist in topspin.

The number of synthetic strings is usually 40 - 50%, preferably around 45%, the main strings and the cross strings.

In a stringing with 18 main strings and 20 cross strings are for example 8 main strings and 9 cross strings plastic strings.

The synthetic strings should be less tensioned than the gut strings, preferably around 800 to 1200 ponds, preferably around 1 kilopond.

Regardless of this, the cross strings should be about 1 kilopond weaker be tense than the main strings.

The advantageous properties of the covering according to the invention at Topspin can be increased a little with a different, stepped tension of the strings, namely in such a way that the tension of the plastic strings and the The tension of the gut strings gradually decreases in the direction from the inside to the outside, that of the main strings is preferably in each case around 100 to 150 Pond, preferably around around 120 pond, and that of the cross strings preferably around 80 - 120 pond each, preferably around 100 Pond.

Finally, as an advantageous embodiment of the invention, a coherent stringing with the plastic strings proposed with an am The transition from the main strings to the cross strings is laid along the inside of the racquet head edge.

In the production of each limited to a midfield Main string covering and cross string covering made of plastic strings results, taking into account other concerns, the need to transition from the main string covering to the cross string covering on the edge of one of the two upper corner areas. Usually, such upper courses are placed on the outside of the club head edge. That would require a special pre-made groove here as the section in question of the club head edge is often hit on the ground.

However, as it turns out, laying inside is possible without any disadvantage.

The drawings show an embodiment of the invention.

Fig. 1 shows a club head with a covering according to the invention, the synthetic strings are black and the gut strings are white.

Fig. 2 illustrates the plastic string covering.

Fig. 3 illustrates the gut string covering.

The stringing is started with the gut strings. The starting knot is denoted by 1. As you can see from the drawing, there are five on the right Main strings pulled, then three cross strings at the bottom, then five main strings on the left and finally eight cross strings at the top. At the intersection point 3, the cross string is underneath the main string laid, at the crossing point 4 the main string over the cross string, on Crossing point 5 the cross string under the main string and at crossing point 2 the Cross string under the main string. The number 6 denotes the end node of the intestinalbec tension. The length of the intestinal covering is 5.10 m.

Then the main strings are placed in the middle fields that have remained free and the cross-string tensioning the plastic strings. It starts at the beginning knot 7 with the main strings, and after a transition 10 continue with the cross strings. At the crossing point 8, the cross string is placed under the main string. The end node is 9. The length of the plastic covering is 4.90 m.

The interweaving of the transition 10 in the intestinal covering is shown in Fig. 1 can be seen.

The main strings made of gut are stretched with 21 pond, the cross strings made of gut with 20 pond, the main strings made of plastic with 20 pond and the cross strings made of plastic with 19 pond.

The gut and plastic strings are made of common material.

Claims (6)

Patent claims tennis racket, the oval racket head with it crossing main and cross strings is strung, characterized in that each a middle section of the main string covering and the cross string covering made of plastic strings consists, and each of the other two side panels consist of gut strings. 2) tennis racket according to claim 1, characterized in that the Number of plastic strings 40-50%, preferably around 45%, of the main strings and the top strings is. 3) tennis racket according to claim 2, characterized in that in a stringing with 18 main strings and 20 cross strings 8 main strings and 9 cross strings Plastic strings are. 4) tennis racket according to one of claims 1> 3, characterized in that that the plastic strings are less tensioned than the gut strings, preferably around 800 1,200 ponds, preferably around 1 kilopond 5) tennis racket according to one of claims 1 - 4, characterized in that the tension of the plastic strings and the tension of the gut strings in each case in a stepwise direction from the inside to the outside decreases, that of the main strings preferably in each case by 100> 150 Pond, preferably around 120 pond, and that of the cross strings preferably around 80 - 120 each Pond, preferably around 100 Pond. 6) tennis racket according to one of claims 1 - 5, characterized by a continuous covering with the plastic strings, one on the racket head edge has the transition from the main strings to the cross strings laid along the inside.